EP0357652B1 - Pneumatic extraction head - Google Patents

Pneumatic extraction head Download PDF

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Publication number
EP0357652B1
EP0357652B1 EP88903817A EP88903817A EP0357652B1 EP 0357652 B1 EP0357652 B1 EP 0357652B1 EP 88903817 A EP88903817 A EP 88903817A EP 88903817 A EP88903817 A EP 88903817A EP 0357652 B1 EP0357652 B1 EP 0357652B1
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EP
European Patent Office
Prior art keywords
compressed air
bulk material
conveyor head
inlet opening
head according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88903817A
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German (de)
French (fr)
Other versions
EP0357652A1 (en
Inventor
Johann Winter
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Individual
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Individual
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Priority to AT88903817T priority Critical patent/ATE71999T1/en
Publication of EP0357652A1 publication Critical patent/EP0357652A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9243—Passive suction heads with no mechanical cutting means
    • E02F3/925—Passive suction heads with no mechanical cutting means with jets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E02F5/287—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with jet nozzles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/10—Pipelines for conveying excavated materials
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C50/00—Obtaining minerals from underwater, not otherwise provided for

Definitions

  • the invention relates to a compressed air delivery head according to the preamble of patent claim 1.
  • the compressed air supply to the compressed air space can either be switched on or off via a single shut-off valve in the compressed air line, and the compressed air in the switched-on state from all compressed air outlet openings more or less upwards to the delivery pipe towards the exit.
  • a disadvantage of the known conveying head is that the compressed air does not exit downwards in the direction of the bulk material to be conveyed and thus cannot loosen it up.
  • the compressed air outlet openings are always open, so that bulk material can penetrate, especially when the compressed air is switched off, and finally an intermittent discharge of the compressed air from the compressed air outlet openings cannot be realized with the manually operated shut-off valve in the compressed air line. All this contributes to the fact that the delivery capacity of the known conveyor head is limited.
  • the compressed air emerging downward around the bulk material inlet opening simultaneously loosens the bulk material to be conveyed.
  • the control devices associated with the non-return valves allow an intermittent supply of compressed air, which enables a considerable increase in the delivery rate.
  • the device shown in Fig. 1 comprises a floating body 1, on which a known impact tank 2 with a drainage channel 3 is arranged.
  • winch jacks 4, 5 are arranged on the floating body 1 on the left and right, each of which carries a motor-driven winch 6 or 7.
  • Ropes 8, 9 lead from these winches - indicated by dash-dotted lines in FIG. 1 - to a conveying head 10 which is connected to the impact container 2 via a telescopic, length-adjustable conveying tube 11.
  • a compressed air line 12 runs parallel to the delivery pipe 11, which on the one hand opens into the delivery head 10 and on the other hand is connected to a compressed air pump (not shown) arranged on the floating body 1.
  • pressurized water can also be used as the pressure medium.
  • the conveying head 10 By actuating the winches 4, 5, the conveying head 10 can be lowered and raised and thereby held in the working position on the bulk material 15 stored under water.
  • the line 12 is a windable hose.
  • a cuboid housing 16 with rear wall 17, front wall 18 and left and right side walls 19 and 20 has a bottom plate 21 at the bottom and a flange plate 22 at the top, which in turn consists of two layers 23, 24, which in turn are connected and stiffened by gusset plates 25 .
  • the conveyor pipe 11 and the Compressed air line 12 are flanged to the flange plate 22, namely its upper layer 24 in a conventional manner.
  • the rectangular base plate 26 encloses a bulk material inlet opening 26. Between the base plate 21 and the flange plate 22, a cylindrical connecting tube 27 enclosing the bulk material inlet opening runs in such a way that an annular compressed air space 28 is formed between the inner wall of the housing 16 and the outer wall of the connecting tube 27, the external rectangular space , e.g. B. square and inside a circular contour.
  • a rectangular box 29 is arranged on the side of the housing 16, the interior 30 of which is connected on the one hand via a pipe socket 31 to the compressed air line 12 and on the other hand via an opening 32 to the annular compressed air space 28.
  • a plurality of compressed air outlet openings A, B, C, D, E and F are arranged in the base plate 21 in the region of the compressed air space 28 (cf. FIG. 3) at mutual intervals around the bulk material inlet opening 26 and open downwards into the open air.
  • Each of these outlet openings is equipped with a spring-loaded non-return flap 33 which, with the interposition of a ring 34 screwed onto the base plate 21 and a sealing covering 35 connected to the flap 33, from below to the outlet opening A. can be applied sealingly.
  • a spring-loaded non-return flap 33 which, with the interposition of a ring 34 screwed onto the base plate 21 and a sealing covering 35 connected to the flap 33, from below to the outlet opening A. can be applied sealingly.
  • Bush 36 firmly welded, which has a compressed air inlet opening 37 on the side.
  • the sleeve 36 is located in the compressed air space 28, so that compressed air can enter through the opening 37.
  • the non-return flap 33 is connected to a rod 38 which extends coaxially in the bush 36 and can be moved up and down in a solid lining 39 which fills the bush 36 at the top (arrow P).
  • a plate 41 With the upper end of the rod 38, a plate 41 is fixedly connected, which is movable in a recess 42 of the chuck 39. Between the plate 41 and the chuck 39 extends around the rod 38 a compression spring 43 which holds the check valve 33 in the closed state.
  • the piston rod 44 of a double-acting pressure medium unit 45 is also connected to the upper end of the rod 38.
  • Pressure medium optionally supplied via lines 46, 47 causes the piston rod 44 and thus the flap 33 to be displaced downwards or upwards, so that the pressure medium outlet opening A can be opened or closed arbitrarily.
  • the pressure medium supplied via the lines 46, 47 to the unit 45, which is also arranged in the compressed air space 28, comes from a pressure medium unit 48, which (without lines) is indicated schematically in FIG. 2.
  • the pressure medium assembly 48 is located in the interior 30 of the box 29.
  • the pressure medium assembly 48 conventionally comprises a pressure medium supply and a pressure medium pump.
  • pressure medium lines up to the water surface are not required. They are just Electrical control lines required to actuate the pressure medium unit 48 and the valves connected to it accordingly, so that in particular the check valves 33 are opened or closed at the compressed air outlet openings.
  • the box 29 is closed by a removable cover 49 so that the unit 48 is accessible.
  • a wear tube 51 runs inside the connecting tube 27, which is firmly connected on the one hand to the upper layer 24 of the flange plate 22 and on the other hand to a ring 52.
  • a wear ring 53 is arranged below the ring 52.
  • the rings 52, 53 are screwed from below to the base plate 51 in such a way that the openings of the rings 52, 53 enclose the pouring dome inlet opening 26.
  • the wear pipe 51 passes into the delivery pipe 11.
  • the tube 51 and the rings 52, 53 are interchangeable parts that can be replaced when worn. Basically, however, the conveying head 10 also works without the wear tube 51 and the rings 52, 53. However, the connecting tube 27 is then flowed through directly by the conveyed bulk material and is thereby worn. The signs of wear are, however, due to the arrangement and design of the air outlet openings A - F described much less than with previous conveying heads.
  • the compressed air delivery head described works in the following way:
  • compressed air (or pressurized water) is introduced into the compressed air space 28 via the compressed air line 12, cf. the essentially downward-pointing arrows in FIG. 2. From there the compressed air flows into the bushes 36 arranged at the compressed air outlet openings A - F. Under the pressure exerted on the non-return flaps 33, these open against the action of the spring 43 (shown in broken lines in FIG. 4), so that the compressed air can emerge from the openings A - F downwards and is directed toward the bulk material 15.
  • the compressed air escapes upwards through the wear pipe 51 and the delivery pipe 11, water and bulk material being carried along to the water surface to the impact container 2. It is assumed that the pressure medium assembly 45 is out of operation. After switching off the compressed air supply, the non-return flaps 33 close under the action of the springs 43. It has been found that, because of the arrangement of the outlet openings AF, a uniform, high delivery rate is achieved, wear phenomena occurring evenly, in particular on the ring 53 and on the wear tube 51 , and certain areas of the conveyor head are not excessively stressed by the bulk material being removed.
  • the delivery rate can also be favorably influenced if the individual non-return flaps 33 are individually controlled in a certain way with the aid of the pressure medium units 45 assigned to them. It is particularly advantageous to alternate certain groups of non-return valves together to open and close.
  • the flaps 33 at the openings A and B can be opened and closed alternately with the flaps at the openings C to F. Accordingly, the flaps 33 at the openings C, D and A, B, E, F can be opened and closed alternately. An alternating opening and closing of the openings E, F with respect to the openings A to D is also possible.
  • the check valves 33 can also be controlled such that all openings A to F are alternately open or closed.
  • the respective closing and opening times can be, for example, a few seconds.
  • the control mode depends on the conveying conditions, in particular the water depth, and the nature of the bulk material to be conveyed and can be easily tested and optimized on the spot.
  • the rear and front walls 17 and 18 of the conveying head housing 16 taper downward and run into tips that penetrate somewhat into the bulk material to be conveyed.
  • these walls are connected by a plurality of inlet regulating strips 54, which are screwed onto the edges of the walls 17, 18 so that they can be replaced individually.
  • the border of the bulk material inlet opening 26 can be modified, depending on how many such strips 54 are attached. It has been found that the conveying capacity can also be changed as a function of the type of bulk material (sand, gravel or the like).
  • An echo probe 55 for measuring the distance between the probe and the bulk material 15 to be removed is arranged on the underside of the box 29 enclosing the space 30.
  • the conveying head 10 is lowered or raised so that it assumes the optimal conveying position.
  • This control of the conveying head 10 can take place fully automatically with the aid of the echo probe 55.
  • corresponding control signals pass from the echo probe 55 to the winches 6, 7 arranged on the floating body 1, which trigger the corresponding lifting or lowering movements of the conveying head.
  • non-return flaps 33 are only fully drawn in at the outlet openings A and B.
  • check valves 33 are provided at all outlet openings A to F.
  • pressure medium units 45 for controlling these flaps 33 only at some of the outlet openings A to F, so that when the compressed air is delivered, the check valves 33 in question are kept open by the prevailing pressure until the compressed air supply is switched off again.
  • a total of six outlet openings A to F are provided on the conveying head 10 described.
  • the number of these openings can also be smaller, in particular openings E and F can be omitted. It is essential that these openings are arranged as symmetrically and evenly as possible on the bulk material inlet opening 26.
  • the conveyor head can be given a kind of vibrating effect by correspondingly cyclically controlling the non-return flaps 33, for example by opening or closing all the flaps together at a certain rhythm, so that it can be used with those provided on its walls 17, 18 below Digs tips better in the bulk material 15.
  • this shaking or impact effect can also be used to penetrate hard and tough, geological layers, which can sometimes cover gravel deposits or the like.
  • the non-return flaps 33 are arranged directly on the base plate 21 and thus in the immediate vicinity of the bulk material inlet opening 26. It can therefore happen that a bulk material part, for example a pebble, penetrates between the opened flap 33 and the base plate 21 and blocks the flap. To prevent this, the non-return flaps 33 can be secured at the bottom, for example by grids. It is better to arrange the non-return flaps 33 spatially separate from the bulk material inlet opening 26 and the compressed air outlet openings A to F, so that no bulk material can hinder the function of the non-return flaps. Such an embodiment is shown in FIG. 5.
  • FIG. 5 corresponds exactly in the region of its inlet opening 26 to the embodiment according to FIGS. 2 and 3.
  • its base plate 21 according to FIG. 3 there are several, for example four, compressed air outlet openings A, B, C, D symmetrical about the axis of the conveyor head formed around and in the compressed air space 28.
  • the non-return plates required for controlling the compressed air outlet are, however, not arranged in the immediate vicinity of these compressed air outlet openings, as will be described later.
  • FIG. 5 the interior 29 of which is in turn connected to the compressed air line 12, extends in contrast to FIGS. 2 and 3 around the entire outer housing 16, as can be seen in FIG. 5.
  • a total of four openings are provided in a base plate 60 of the box 29, of which two openings, namely the openings 61 and 62, are shown in FIG. 5.
  • Each of these openings can be closed arbitrarily by a non-return flap 33, an actuating or control device 64, for example a pneumatic or electromechanical control device, being assigned to each non-return flap 33, which in turn is preferably spring-loaded.
  • Each space 65 has an opening 66 which, via a pipeline 67, each with one of the compressed air outlet openings A, B, C and D formed in the base plate 21 connected is.
  • the check valves 33 In this way it can be achieved by appropriate actuation of the check valves 33 that compressed air exits at the desired compressed air outlet openings A to D.
  • the flaps 33 are spatially separated from the compressed air outlet openings A to D, so that they cannot be blocked by bulk material.
  • the piping 67 carrying compressed air runs inside the compressed air space 28 between the outer walls of the housing 16 and the connecting pipe 27.
  • the control devices 64 in the space 30 are preferably designed as compressed air-operated devices, similar to the arrangement according to FIG. 4. As compressed air, the Compressed air supplied via the compressed air line 12 in the room 30 is used.
  • a control box 68 schematically indicated in FIG. 5 and provided in the space 30 contains valves for actuating the individual control devices 64. Via a ventilation line 69 provided on the box 29 and leading to the water surface, the control device 64 or the valves provided in the control box 68 can be vented if necessary .

Abstract

PCT No. PCT/EP88/00355 Sec. 371 Date Oct. 20, 1989 Sec. 102(e) Date Oct. 20, 1989 PCT Filed Apr. 27, 1988 PCT Pub. No. WO88/08470 PCT Pub. Date Nov. 3, 1988.A pneumatic extraction head for underwater debris, in particular sand and gravel, has a joint or connecting pipe extending inside the housing between the base plate and the flange plate and surrounding the debris inlet opening, this connecting pipe forming an annular compressed air space between the inner wall of the housing and the outer wall of the connecting pipe; several mutually-spaced compressed air outlet openings provided in the base plate in the compressed air space around the debris inlet opening; and nonreturn valves for controlling the exit of compressed air out of the compressed air outlet openings.

Description

Die Erfindung betrifft einen Druckluft-Förderkopf nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a compressed air delivery head according to the preamble of patent claim 1.

Ein solcher Förderkopf ist aus der DE-C-858 974 bekannt, wobei über ein einziges Absperrventil in der Druckluftleitung die Druckluftzufuhr in den Druckluftraum entweder ein- oder ausgeschaltet werden kann, und die Druckluft im Einschaltungszustand aus allen Druckluftauslaßöffnungen mehr oder weniger nach oben zum Förderrohr hin gerichtet austritt.Such a delivery head is known from DE-C-858 974, the compressed air supply to the compressed air space can either be switched on or off via a single shut-off valve in the compressed air line, and the compressed air in the switched-on state from all compressed air outlet openings more or less upwards to the delivery pipe towards the exit.

Nachteilig bei dem bekannten Förderkopf ist es, daß die Druckluft nicht nach unten in Richtung auf das zu fördernde Schüttgut austritt und somit dieses nicht auflockern kann. Außerdem sind die Druckluftauslaßöffnungen ständig offen, so daß, insbesondere bei abgeschalteter Druckluft, Schüttgut eindringen kann, und schließlich kann mit dem handbetätigten Sperrventil in der Druckluftleitung ein intermittierender Austritt der Druckluft aus den Druckluftauslaßöffnungen nicht realisiert werden. All dies trägt dazu bei, daß die Förderleistung des bekannten Förderkopfes beschränkt ist.A disadvantage of the known conveying head is that the compressed air does not exit downwards in the direction of the bulk material to be conveyed and thus cannot loosen it up. In addition, the compressed air outlet openings are always open, so that bulk material can penetrate, especially when the compressed air is switched off, and finally an intermittent discharge of the compressed air from the compressed air outlet openings cannot be realized with the manually operated shut-off valve in the compressed air line. All this contributes to the fact that the delivery capacity of the known conveyor head is limited.

Es ist Aufgabe der Erfindung, den geschilderten Nachteilen des bekannten Förderkopfes abzuhelfen und die Druckluftzufuhr so zu verbessern, daß störungsfrei eine hohe Förderleistung erreichbar ist.It is an object of the invention to remedy the disadvantages of the known conveying head and to improve the compressed air supply in such a way that a high conveying capacity can be achieved without problems.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.The object is achieved by the characterizing features of claim 1.

Die um die Schüttguteinlaßöffnung nach unten austretende Druckluft lockert gleichzeitig das zu fördernde Schüttgut. Die den Rückschlagklappen zugeordnete Steuervorrichtungen gestatten eine intermittierende Druckluftzufuhr, was eine beträchtliche Steigerung der Förderleistung ermöglicht.The compressed air emerging downward around the bulk material inlet opening simultaneously loosens the bulk material to be conveyed. The control devices associated with the non-return valves allow an intermittent supply of compressed air, which enables a considerable increase in the delivery rate.

Die nachstehende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit beiliegender Zeichnung der weiteren Erläuterung. Es zeigen:

  • Fig. 1 schematisch einen Druckluft-Förderkopf beim Abbau von unter Wasser lagerndem Schüttgut;
  • Fig.2 eine Längsschnittansicht des Förderkopfes aus Fig. 1;
  • Fig. 3 eine Querschnittsansicht entlang der Linie 3-3 in Fig. 2;
  • Fig. 4 eine Teilschnittansicht entlang der Linie 4-4 in Fig. 3 und
  • Fig. 5 eine Längsschnittansicht einer anderen Ausführungsform .
The following description of preferred embodiments of the invention serves in conjunction with the accompanying drawings for further explanation. Show it:
  • 1 schematically shows a compressed air delivery head during the dismantling of bulk material stored under water;
  • 2 shows a longitudinal sectional view of the conveyor head from FIG. 1;
  • Figure 3 is a cross-sectional view taken along line 3-3 in Figure 2;
  • Fig. 4 is a partial sectional view taken along line 4-4 in Fig. 3 and
  • Fig. 5 is a longitudinal sectional view of another embodiment.

Die in Fig. 1 dargestellte Vorrichtung umfaßt einen Schwimmkörper 1, auf den ein an sich bekannter Prallbehälter 2 mit einer Entwässerungsrinne 3 angeordnet ist. Etwa im gleichen Abstand vom Prallbehälter 2 sind auf dem Schwimmkörper 1 links und rechts Windenböcke 4,5 angeordnet, die jeweils eine motorgetriebene Winde 6 bzw. 7 tragen. Von diesen Winden führen - in Fig. 1 strichpunktiert angedeutete - Seile 8, 9 zu einem Förderkopf 10, der über ein teleskopierendes, längenveränderliches Förderrohr 11 mit dem Prallbehälter 2 verbunden ist. Parallel zum Förderrohr 11- verläuft eine Druckluftleitung 12, die einerseits im Förderkopf 10 ausmündet und andererseits mit einer nicht dargestellten, auf dem Schwimmkörper 1 angeordneten Druckluftpumpe verbunden ist. Als Druckmedium kommt außer Druckluft auch noch Druckwasser in Frage. Durch Betätigung der Winden 4, 5 kann der Förderkopf 10 abgesenkt und angehoben und hierdurch in Arbeitslage an dem unter Wasser lagernden Schüttgut 15 gehalten werden. Die Leitung 12 ist ein aufwickelbarer Schlauch.The device shown in Fig. 1 comprises a floating body 1, on which a known impact tank 2 with a drainage channel 3 is arranged. Approximately at the same distance from the impact container 2, winch jacks 4, 5 are arranged on the floating body 1 on the left and right, each of which carries a motor-driven winch 6 or 7. Ropes 8, 9 lead from these winches - indicated by dash-dotted lines in FIG. 1 - to a conveying head 10 which is connected to the impact container 2 via a telescopic, length-adjustable conveying tube 11. A compressed air line 12 runs parallel to the delivery pipe 11, which on the one hand opens into the delivery head 10 and on the other hand is connected to a compressed air pump (not shown) arranged on the floating body 1. In addition to compressed air, pressurized water can also be used as the pressure medium. By actuating the winches 4, 5, the conveying head 10 can be lowered and raised and thereby held in the working position on the bulk material 15 stored under water. The line 12 is a windable hose.

Die Fig. 2 und 3 zeigen den Aufbau des Förderkopfes 10 im einzelnen. Ein quaderförmiges Gehäuse 16 mit Rückwand 17, Vorderwand 18 und linken und rechten Seitenwänden 19 bzw. 20 weist unten eine Bodenplatt 21 und oben eine Flanschplatte22 auf, die ihrerseits aus zwei Lagen 23, 24 besteht, welche wiederum durch Knotenbleche 25 miteinander verbunden und versteift sind. Das Förderrohr 11 und die Druckluftleitung 12 sind an die Flanschplatte 22, nämlich deren obere Lage 24 in herkömmlicher Weise angeflanscht.2 and 3 show the structure of the conveyor head 10 in detail. A cuboid housing 16 with rear wall 17, front wall 18 and left and right side walls 19 and 20 has a bottom plate 21 at the bottom and a flange plate 22 at the top, which in turn consists of two layers 23, 24, which in turn are connected and stiffened by gusset plates 25 . The conveyor pipe 11 and the Compressed air line 12 are flanged to the flange plate 22, namely its upper layer 24 in a conventional manner.

Die rechteckige Bodenplatte 26 umschließt eine Schüttguteinlaßöffnung 26. Zwischen Bodenplatte 21 und Flanschplatte 22 verläuft ein die Schüttguteinlaßöffnung umschließendes, zylindrisches Verbindungsrohr 27 derart, daß zwischen der Innenwand des Gehäuses 16 und der Außenwand des Verbindungsrohres 27 ein ringförmiger Druckluftraum 28 gebildet ist, der außen eine rechteckige, z. B. quadratische und innen eine kreisrunde Kontur hat.The rectangular base plate 26 encloses a bulk material inlet opening 26. Between the base plate 21 and the flange plate 22, a cylindrical connecting tube 27 enclosing the bulk material inlet opening runs in such a way that an annular compressed air space 28 is formed between the inner wall of the housing 16 and the outer wall of the connecting tube 27, the external rectangular space , e.g. B. square and inside a circular contour.

Am Gehäuse 16 ist seitlich ein rechtwinkliger Kasten 29 angeordnet, dessen Innenraum 30 einerseits über einen Rohrstutzen 31 mit der Druckluftleitung 12 und andererseits über eine Öffnung 32 mit dem ringförmigen Druckluftraum 28 verbunden ist. In der Bodenplatte 21 sind im Bereich des Druckluftraumes 28 (vgl. Fig. 3) in gegenseitigen Abständen um die Schüttguteinlaßöffnung 26 herum mehrere Druckluftauslaßöffnungen A, B, C, D, E und F angeordnet, die nach unten ins Freie münden.A rectangular box 29 is arranged on the side of the housing 16, the interior 30 of which is connected on the one hand via a pipe socket 31 to the compressed air line 12 and on the other hand via an opening 32 to the annular compressed air space 28. A plurality of compressed air outlet openings A, B, C, D, E and F are arranged in the base plate 21 in the region of the compressed air space 28 (cf. FIG. 3) at mutual intervals around the bulk material inlet opening 26 and open downwards into the open air.

Jede dieser Austrittsöffnungen ist, wie in Fig. 4 für die Austrittsöffnung A dargestellt, mit einer federbelasteten Rückschlagklappe 33 ausgestattet, die unter Zwischenschaltung eines an die Bodenplatte 21 angeschraubten Ringes 34 und eines mit der Klappe 33 verbundenes Dichtbelages 35 von unten her an die Auslaßöffnung A abdichtend anlegbar ist. Wie dargestellt, ist in die Austrittsöffnung A eine Büchse 36 fest eingeschweißt, die seitlich eine Drucklufteintrittsöffnung 37 aufweist. Die Büchse 36 befindet sich im Druckluftraum 28, so daß Druckluft durch die Öffnung 37 eintreten kann. Die Rückschlagklappe 33 ist mit einer koaxial in der Büchse 36 verlaufenden Stange 38 verbunden, die in einem die Büchse 36 oben ausfüllenden, massiven Futter 39 auf- und abbeweglich ist (Pfeil P). Mit dem oberen Ende der Stange 38 ist ein Teller 41 fest verbunden, der in einer Aussparung 42 des Futters 39 beweglich ist. Zwischen dem Teller 41 und dem Futter 39 erstreckt sich eine um die Stange 38 herumgelegte Druckfeder 43, welche die Rückschlagklappe 33 im Schließzustand hält.Each of these outlet openings, as shown in FIG. 4 for the outlet opening A, is equipped with a spring-loaded non-return flap 33 which, with the interposition of a ring 34 screwed onto the base plate 21 and a sealing covering 35 connected to the flap 33, from below to the outlet opening A. can be applied sealingly. As shown, is in the outlet opening A Bush 36 firmly welded, which has a compressed air inlet opening 37 on the side. The sleeve 36 is located in the compressed air space 28, so that compressed air can enter through the opening 37. The non-return flap 33 is connected to a rod 38 which extends coaxially in the bush 36 and can be moved up and down in a solid lining 39 which fills the bush 36 at the top (arrow P). With the upper end of the rod 38, a plate 41 is fixedly connected, which is movable in a recess 42 of the chuck 39. Between the plate 41 and the chuck 39 extends around the rod 38 a compression spring 43 which holds the check valve 33 in the closed state.

Mit dem oberen Ende der Stange 38 ist weiterhin die Kolbenstange 44 eines doppelt wirkenden Druckmediumaggregats 45, vorzugsweise eines Hydraulikzylinders verbunden. Wahlweise über Leitungen 46, 47 zugeführtes Druckmedium bewirkt eine Verschiebung der Kolbenstange 44 und damit der Klappe 33 nach unten oder oben, so daß die Druckmittelaustrittsöffnung A willkürlich geöffnet oder geschlossen werden kann. Das über die Leitungen 46, 47 dem ebenfalls im Druckluftraum 28 angeordneten Aggregat 45 zugeleitete Druckmedium stammt aus einem Druckmediumaggregat 48, welches (ohne Leitungen) in Fig. 2 schematisch angedeutet ist. Wie dargestellt, befindet sich das Druckmediumaggregat 48 im Innenraum 30 des Kastens 29. Das Druckmediumaggregat 48 umfaßt in herkömmlicher Weise einen Druckmediumvorrat und eine Druckmediumpumpe. Da somit das Druckmediumaggregat 48 unmittelbar am Förderkopf 10 angeordnet ist, entfallen Druckmediumleitungen bis zur Wasseroberfläche. Es sind lediglich elektrische Steuerleitungen erforderlich, um das Druckmediumaggregat 48 und mit diesem verbundene Ventile entsprechend zu betätigen, so daß insbesondere die Rückschlagklappen 33 an den Druckluftauslaßöffnungen geöffnet oder geschlossen werden. Der Kasten 29 ist durch einen abnehmbaren Deckel49 verschlossen, so daß das Aggregat 48 zugänglich ist.The piston rod 44 of a double-acting pressure medium unit 45, preferably a hydraulic cylinder, is also connected to the upper end of the rod 38. Pressure medium optionally supplied via lines 46, 47 causes the piston rod 44 and thus the flap 33 to be displaced downwards or upwards, so that the pressure medium outlet opening A can be opened or closed arbitrarily. The pressure medium supplied via the lines 46, 47 to the unit 45, which is also arranged in the compressed air space 28, comes from a pressure medium unit 48, which (without lines) is indicated schematically in FIG. 2. As shown, the pressure medium assembly 48 is located in the interior 30 of the box 29. The pressure medium assembly 48 conventionally comprises a pressure medium supply and a pressure medium pump. Since the pressure medium assembly 48 is thus arranged directly on the conveying head 10, pressure medium lines up to the water surface are not required. They are just Electrical control lines required to actuate the pressure medium unit 48 and the valves connected to it accordingly, so that in particular the check valves 33 are opened or closed at the compressed air outlet openings. The box 29 is closed by a removable cover 49 so that the unit 48 is accessible.

Wie aus Fig. 2 und 3 weiterhin hervorgeht, verläuft innerhalb das Verbindungsrohres 27 ein Verschleißrohr 51, das einerseits fest mit der oberen Lage 24 der Flanschplatte 22 und andererseits mit einem Ring 52 verbunden ist. Unterhalb des Ringes 52 ist ein Verschleißring 53 angeordnet. Die Ringe 52, 53 sind von unten her mit der Bodenplatte 51 derart verschraubt, daß die Öffnungen der Ringe 52, 53 die Schüttauteinlaßöffnung 26 umschließen. An seiner Oberseite leitet das Verschleißrohr 51 in das Förderrohr 11 über.As can also be seen from FIGS. 2 and 3, a wear tube 51 runs inside the connecting tube 27, which is firmly connected on the one hand to the upper layer 24 of the flange plate 22 and on the other hand to a ring 52. A wear ring 53 is arranged below the ring 52. The rings 52, 53 are screwed from below to the base plate 51 in such a way that the openings of the rings 52, 53 enclose the pouring dome inlet opening 26. At its top, the wear pipe 51 passes into the delivery pipe 11.

Das Rohr 51 und die Ringe 52, 53 sind auswechselbare Teile, die bei Verschleiß ausgetauscht werden können. Grundsätzlich funktioniert der Förderkopf 10 jedoch auch ohne das Verschleißrohr 51 und die Ringe 52, 53. Allerdings wird dann das Verbindungsrohr 27 direkt vom geförderten Schüttgut durchflossen und hierdurch abgenutzt. Die Abnutzungserscheinungen sind jedoch aufgrund der beschriebenen Anordnung und Ausbildung der Luftaustrittsöffnungen A - F wesentlich geringer als bei bisherigen Förderköpfen.The tube 51 and the rings 52, 53 are interchangeable parts that can be replaced when worn. Basically, however, the conveying head 10 also works without the wear tube 51 and the rings 52, 53. However, the connecting tube 27 is then flowed through directly by the conveyed bulk material and is thereby worn. The signs of wear are, however, due to the arrangement and design of the air outlet openings A - F described much less than with previous conveying heads.

Der beschriebene Druckluft-Förderkopf wirkt in folgender Weise:The compressed air delivery head described works in the following way:

Nachdem der Förderkopf 10 mit Hilfe der Winden 6, 7 auf das unter Wasser lagernde Schüttgut abgesenkt ist, wird über die Druckluftleitung 12 Druckluft (oder Druckwasser) in den Druckluftraum 28 eingeleitet, vgl. die im wesentlichen nach unten gerichteten Pfeile in Fig. 2. Von da strömt die Druckluft in die an den Druckluftauslaßöffnungen A - F angeordneten Büchsen 36 ein. Unter dem hierbei auf die Rückschlagklappen 33 ausgeübten Druck öffnen sich diese gegen die Wirkung der Feder 43 (in Fig. 4 strichpunktiert dargestellt), so daß die Druckluft aus den Öffnungen A - F nach unten austreten kann und zum Schüttgut 15 hingelenkt wird. Nach entsprechender Umlenkung entweicht die Druckluft nach oben durch das Verschleißrohr 51 und das Förderrohr 11, wobei Wasser und Schüttgut an die Wasseroberfläche zum Prallbehälter 2 mitgerissen wird. Dabei ist angenommen, daß das Druckmittelaggregat 45 außer Betrieb ist. Nach Abschaltung der Druckluftzufuhr schließen sich die Rückschlagklappen 33 unter der Wirkung der Federn 43. Es wurde gefunden, daß wegen der Anordnung der Auslaßöffnungen A - F eine gleichmäßige, hohe Förderleistung erzielt wird, wobei Verschleißerscheinungen gleichmäßig, insbesondere am Ring 53 und am Verschleißrohr 51 auftreten, und bestimmte Bereiche des Förderkopfes nicht übermäßig durch das abgeförderte Schüttgut beansprucht werden.After the conveying head 10 has been lowered onto the bulk material stored under water with the aid of the winches 6, 7, compressed air (or pressurized water) is introduced into the compressed air space 28 via the compressed air line 12, cf. the essentially downward-pointing arrows in FIG. 2. From there the compressed air flows into the bushes 36 arranged at the compressed air outlet openings A - F. Under the pressure exerted on the non-return flaps 33, these open against the action of the spring 43 (shown in broken lines in FIG. 4), so that the compressed air can emerge from the openings A - F downwards and is directed toward the bulk material 15. After a corresponding deflection, the compressed air escapes upwards through the wear pipe 51 and the delivery pipe 11, water and bulk material being carried along to the water surface to the impact container 2. It is assumed that the pressure medium assembly 45 is out of operation. After switching off the compressed air supply, the non-return flaps 33 close under the action of the springs 43. It has been found that, because of the arrangement of the outlet openings AF, a uniform, high delivery rate is achieved, wear phenomena occurring evenly, in particular on the ring 53 and on the wear tube 51 , and certain areas of the conveyor head are not excessively stressed by the bulk material being removed.

Die Förderleistung läßt sich weiterhin günstig beeinflussen, wenn die einzelnen Rückschlagklappen 33 mit Hilfe der ihnen zugeordneten Druckmediumaggregate 45 einzeln in bestimmter Weise gesteuert werden. Besonders vorteilhaft ist es, bestimmte Gruppen von Rückschlagklappen abwechselnd gemeinsam zu öffnen und zu schließen. So können beispielsweise die Klappen 33 an den Öffnungen A und B jeweils abwechselnd mit den Klappen an den Öffnungen C bis F geöffnet bzw. geschlossen werden. Entsprechend können auch die Klappen 33 an den Öffnungen C, D bzw. A, B, E, F abwechselnd geöffnet und geschlossen werden. Auch eine abwechselnde Öffnung und Schließung der Öffnungen E, F bezüglich der Öffnungen A bis D ist möglich. Schließlich kann die Steuerung der Rückschlagklappen 33 auch so erfolgen, daß abwechselnd alle Öffnungen A bis F offen oder geschlossen sind. Die jeweilige Schließ- und Öffnunasdauer kann beispielsweise einige Sekunden betragen. Der Steuerungsmodus hängt jeweils von den Förderbedingungen, insbesondere der Wassertiefe, und der Beschaffenheit des zu fördernden Schüttgutes ab und läßt sich an Ort und Stelle leicht ausprobieren und optimieren.The delivery rate can also be favorably influenced if the individual non-return flaps 33 are individually controlled in a certain way with the aid of the pressure medium units 45 assigned to them. It is particularly advantageous to alternate certain groups of non-return valves together to open and close. For example, the flaps 33 at the openings A and B can be opened and closed alternately with the flaps at the openings C to F. Accordingly, the flaps 33 at the openings C, D and A, B, E, F can be opened and closed alternately. An alternating opening and closing of the openings E, F with respect to the openings A to D is also possible. Finally, the check valves 33 can also be controlled such that all openings A to F are alternately open or closed. The respective closing and opening times can be, for example, a few seconds. The control mode depends on the conveying conditions, in particular the water depth, and the nature of the bulk material to be conveyed and can be easily tested and optimized on the spot.

Wie dargestellt, verjüngen sich die Rück- und Vorderwand 17 bzw. 18 des Förderkopfgehäuses 16 nach unten und laufen in Spitzen aus, die etwas in das zu fördernde Schüttgut eindringen. Unterhalb der Schüttguteinlaßöffnung 26, wo die Verjüngung der Wände 17, 18 noch nicht begonnen hat, sind diese Wände durch mehrere Zulaufregulierstreifen 54 verbunden, die einzeln auswechselbar auf die Kanten der Wände 17, 18 aufgeschraubt sind. Hierdurch läßt sich die Umrandung der Schüttguteinlaßöffnung 26 modifizieren, je nachdem, wieviele solcher Streifen 54 angebracht sind. Es wurde gefunden, daß sich auch hierdurch die Förderleistung in Abhängigkeit von der Art des Schüttgutes (Sand, Kies oder dergleichen) verändern läßt.As shown, the rear and front walls 17 and 18 of the conveying head housing 16 taper downward and run into tips that penetrate somewhat into the bulk material to be conveyed. Below the bulk material inlet opening 26, where the tapering of the walls 17, 18 has not yet begun, these walls are connected by a plurality of inlet regulating strips 54, which are screwed onto the edges of the walls 17, 18 so that they can be replaced individually. As a result, the border of the bulk material inlet opening 26 can be modified, depending on how many such strips 54 are attached. It has been found that the conveying capacity can also be changed as a function of the type of bulk material (sand, gravel or the like).

An der Unterseite des den Raum 30 umschließenden Kastens 29 ist eine an sich bekannte Echosonde 55 zur Messung des Abstandes zwischen der Sonde und dem abzufördernden Schüttgut 15 angeordnet. In Abhängigkeit von dem gemessenen Abstand wird der Förderkopf 10 jeweils so abgesenkt oder angehoben, daß er die optimale Förderposition einnimmt. Diese Einsteuerung des Förderkopfes 10 kann mit Hilfe der Echosonde 55 vollautomatisch erfolgen. In diesem Falle gelangen entsprechende Steuersignale von der Echosonde 55 zu den auf dem Schwimmkörper 1 angeordneten Winden 6, 7, welche die entsprechenden Hub- bzw. Absenkbewegungen des Förderkopfes auslösen.An echo probe 55, known per se, for measuring the distance between the probe and the bulk material 15 to be removed is arranged on the underside of the box 29 enclosing the space 30. Depending on the measured distance, the conveying head 10 is lowered or raised so that it assumes the optimal conveying position. This control of the conveying head 10 can take place fully automatically with the aid of the echo probe 55. In this case, corresponding control signals pass from the echo probe 55 to the winches 6, 7 arranged on the floating body 1, which trigger the corresponding lifting or lowering movements of the conveying head.

Aus Gründen der Übersichtlichkeit sind in Fig. 3 die Rückschlagklappen 33 nur bei den Auslaßöffnungen A und B voll eingezeichnet. Bei der bevorzugten Ausführungsform sind an allen Auslaßöffnungen A bis F solche Rückschlagklappen 33 vorgesehen. Hingegen ist es möglich, Druckmediumaggregate 45 zur Steuerung dieser Klapnen 33 lediglich an einigen der Auslaßöffnungen A bis F vorzusehen, so daß bei Druckluftanlieferung die betreffenden Rückschlagklappen 33 so lange durch den herrschenden Druck offengehalten sind, bis die Druckluftzufuhr wieder abgeschaltet ist.For the sake of clarity, the non-return flaps 33 are only fully drawn in at the outlet openings A and B. In the preferred embodiment, such check valves 33 are provided at all outlet openings A to F. On the other hand, it is possible to provide pressure medium units 45 for controlling these flaps 33 only at some of the outlet openings A to F, so that when the compressed air is delivered, the check valves 33 in question are kept open by the prevailing pressure until the compressed air supply is switched off again.

An dem beschriebenen Förderkopf 10 sind insgesamt sechs Auslaßöffnungen A bis F vorgesehen. Die Zahl dieser Öffnungen kann auch kleiner sein, insbesondere können die Öffnungen E und F weggelassen werden. Wesentlich ist, daß diese Öffnungen möglichst symmetrisch und gleichmäßig an der Schüttguteinlaßöffnung 26 angeordnet sind.A total of six outlet openings A to F are provided on the conveying head 10 described. The number of these openings can also be smaller, in particular openings E and F can be omitted. It is essential that these openings are arranged as symmetrically and evenly as possible on the bulk material inlet opening 26.

Es wurde auch gefunden, daß sich durch entsprechende taktweise Steuerung der Rückschlagklappen 33, beispielsweise durch jeweils gemeinsames Öffnen oder Schließen aller Klappen in bestimmten Rhythmus dem Förderkopf eine Art Rütteleffekt mitgeteilt werden kann, so daß er sich mit den an seinen Wänden 17, 18 unten vorgesehenen Spitzen besser in das Schüttgut 15 eingräbt. Insbesondere kann dieser Rüttel- oder Stoßeffekt auch dazu ausgenutzt werden, um harte und zähe, geologische Schichten zu durchdringen, welche Kiesablagerungen oder dergleichen manchmal überdecken können.It has also been found that the conveyor head can be given a kind of vibrating effect by correspondingly cyclically controlling the non-return flaps 33, for example by opening or closing all the flaps together at a certain rhythm, so that it can be used with those provided on its walls 17, 18 below Digs tips better in the bulk material 15. In particular, this shaking or impact effect can also be used to penetrate hard and tough, geological layers, which can sometimes cover gravel deposits or the like.

Wie sich insbesondere aus Fig. 2 und 4 ergibt, sind die Rückschlagklappen 33 direkt an der Bodenplatte 21 und damit in unmittelbarer Nähe der Schüttguteinlaßöffnung 26 angeordnet. Daher kann es vorkommen, daß ein Schüttgutteil, beispielsweise ein Kieselstein zwischen die geöffnete Klappe 33 und die Bodenplatte 21 eindringt und die Klappe blockiert. Um dies zu verhindern, können die Rückschlagklappen 33 unten, beispielsweise durch Gitter, abgesichert werden. Besser ist es, die Rückschlagklappen 33 räumlich getrennt von der Schüttguteinlaßöffnung 26 und den Druckluftauslaßöffnungen A bis F anzuordnen, so daß kein Schüttgut die Funktion der Rückschlagklappen behindern kann. Eine solche Ausführungsform ist in Fig. 5 dargestellt.As can be seen in particular from FIGS. 2 and 4, the non-return flaps 33 are arranged directly on the base plate 21 and thus in the immediate vicinity of the bulk material inlet opening 26. It can therefore happen that a bulk material part, for example a pebble, penetrates between the opened flap 33 and the base plate 21 and blocks the flap. To prevent this, the non-return flaps 33 can be secured at the bottom, for example by grids. It is better to arrange the non-return flaps 33 spatially separate from the bulk material inlet opening 26 and the compressed air outlet openings A to F, so that no bulk material can hinder the function of the non-return flaps. Such an embodiment is shown in FIG. 5.

Der Förderkopf gemäß Fig. 5 entspricht im Bereich seiner Einlaßöffnung 26 genau der Ausführungsform nach Fig. 2 und 3. Insbesondere sind in seiner Bodenplatte 21 entsprechend Fig. 3 mehrere, beispielsweise vier Druckluftauslaßöffnungen A, B, C, D symmetrisch um die Achse des Förderkopfes herum und im Druckluftraum 28 ausgebildet. Die für die Steuerung des Druckluftaustritts erforderlichen Rückschlagplatten sind jedoch im Gegensatz zu Fig. 4 nicht in unmittelbarer Nähe dieser Druckluftauslaßöffnungen angeordnet, wie später noch beschrieben werden wird.5 corresponds exactly in the region of its inlet opening 26 to the embodiment according to FIGS. 2 and 3. In particular, in its base plate 21 according to FIG. 3 there are several, for example four, compressed air outlet openings A, B, C, D symmetrical about the axis of the conveyor head formed around and in the compressed air space 28. In contrast to FIG. 4, the non-return plates required for controlling the compressed air outlet are, however, not arranged in the immediate vicinity of these compressed air outlet openings, as will be described later.

Der auch am Förderkopf gemäß Fig. 5 vorgesehene Kasten 29, dessen Innenraum 30 wiederum mit der Druckluftleitung 12 verbunden ist, erstreckt sich im Gegensatz zu Fig. 2 und 3 um das gesamte, äußere Gehäuse 16 herum, wie aus Fig. 5 ersichtlich. In einer Bodenplatte 60 des Kastens 29 sind insgesamt vier Öffnungen vorgesehen, von denen in Fig. 5 zwei Öffnungen, nämlich die Öffnungen 61 und 62 dargestellt sind. Jede dieser Öffnungen ist durch eine Rückschlagklappe 33 willkürlich verschließbar, wobei jeder Rückschlagklappe 33, die vorzugsweise wiederum federbelastet ist, eine Betätigungs- oder Steuervorrichtung 64 zugeordnet ist, beispielsweise eine pneumatische oder elektromechanische Steuervorrichtung.5, the interior 29 of which is in turn connected to the compressed air line 12, extends in contrast to FIGS. 2 and 3 around the entire outer housing 16, as can be seen in FIG. 5. A total of four openings are provided in a base plate 60 of the box 29, of which two openings, namely the openings 61 and 62, are shown in FIG. 5. Each of these openings can be closed arbitrarily by a non-return flap 33, an actuating or control device 64, for example a pneumatic or electromechanical control device, being assigned to each non-return flap 33, which in turn is preferably spring-loaded.

Jede der durch eine Klappe 33 verschließbaren Öffnungen - z.B. 61, 62 - führt in einen für sich abgedichteten, vom Innenraum 30 getrennten Raum 65. Jeder Raum 65 weist eine Öffnung 66 auf, die über eine Rohrleitung 67 jeweils mit einer der in der Bodenplatte 21 ausgebildeten Druckluftauslaßöffnungen A, B, C bzw. D verbunden ist. Auf diese Weise kann durch entsprechende Betätigung der Rückschlagklappen 33 erreicht werden, daß Druckluft an den gewünschten Druckluftauslaßöffnungen A bis D austritt. Dennoch sind die Klappen 33 von den Druckluftauslaßöffnungen A bis D räumlich getrennt, so daß sie von Schüttgut nicht blockiert werden können. Wie aus Fig. 5 weiterhin ersichtlich ist, verlaufen die Druckluft führenden Rohrleitungen 67 innerhalb des Druckluftraumes 28 zwischen den äußeren Wänden des Gehäuses 16 und dem Verbindungsrohr 27.Each of the openings which can be closed by a flap 33 - e.g. 61, 62 - leads into a sealed-off space 65 which is separate from the interior 30. Each space 65 has an opening 66 which, via a pipeline 67, each with one of the compressed air outlet openings A, B, C and D formed in the base plate 21 connected is. In this way it can be achieved by appropriate actuation of the check valves 33 that compressed air exits at the desired compressed air outlet openings A to D. Nevertheless, the flaps 33 are spatially separated from the compressed air outlet openings A to D, so that they cannot be blocked by bulk material. As can also be seen from FIG. 5, the piping 67 carrying compressed air runs inside the compressed air space 28 between the outer walls of the housing 16 and the connecting pipe 27.

Die Steuervorrichtungen 64 im Raum 30 sind vorzugsweise als druckluftbetätigte Vorrichtungen, ähnlich wie die Anordnung gemäß Fig. 4 ausgebildet. Als Druckluft wird die über die Druckluftleitung 12 zugeführte Druckluft im Raum 30 ausgenutzt. Ein in Fig. 5 schematisch angedeuteter, im Raum 30 vorgesehener Steuerkasten 68 enthält Ventile zur Betätigung der einzelnen Steuervorrichtungen 64. Über eine am Kasten 29 vorgesehene, zur Wasseroberfläche führende Entlüftungsleitung 69 können die Steuervorrichtung 64 bzw. die im Steuerkasten 68 vorgesehenen Ventile bedarfsweise entlüftet werden.The control devices 64 in the space 30 are preferably designed as compressed air-operated devices, similar to the arrangement according to FIG. 4. As compressed air, the Compressed air supplied via the compressed air line 12 in the room 30 is used. A control box 68 schematically indicated in FIG. 5 and provided in the space 30 contains valves for actuating the individual control devices 64. Via a ventilation line 69 provided on the box 29 and leading to the water surface, the control device 64 or the valves provided in the control box 68 can be vented if necessary .

Claims (11)

1. Compressed air conveyor head (10) for bulk materials (15), in particular sand and gravel, stored under water, having a housing (16), exhibiting a bulk material inlet opening (26) on its open bottom side, and having a flange plate (22), located at the top of the housing, for connection of a conveying pipe (11) and a compressed air line (12), a connection pipe (27), which surrounds the bulk material inlet opening, extending in the interior of the housing between the bulk material inlet opening and the flange plate for formation of a compressed air apace (28) between the inside wall of the housing and the outside wall of the connection pipe, and compressed air outlet openings (A, B, C, D, E, F) being provided in the compressed air space, characterised by the following features:
a. a bottom plate (21), which surrounds the bulk material inlet opening (26), is arranged on the bottom side of the housing (16);
b. the compressed air outlet openings (A, B, C, D, E, F) are arranged on the bottom plate (21) spaced apart around the bulk material inlet opening (26);
c. non-return flaps (33) are arranged at the compressed air outlet openings (A, B, C, D, E, F) for controlling the emergence of the compressed air; and
d. control devices (45, 64) are arranged on at least some of the non-return flaps (33) for their intentional opening and closing.
2. Conveyor head according to Claim 1, characterised in that the non-return flaps (33) are arranged essentially directly at the compressed air outlet openings (A to F).
3. Conveyor head according to Claim 1, characterised in that the non-return flaps (33) are arranged so as to be spatially separated from the compressed air outlet openings (A to D), and in that compressed air lines (67) connect the flaps (33) to the openings (A to D).
4. Conveyor head according to Claim 3, characterised in that the non-return flaps (33) are provided in a case (29) which is located above the bulk material inlet opening (26) with clearance.
5. Conveyor head according to Claim 3 or 4, characterised in that the compressed air lines (67) extend in the compressed air space (28).
6. Conveyor head according to one of the preceding claims, characterised by a wear-resistant pipe (51) arranged so as to be exchangeable in the interior of the connection pipe (27) between the bottom plate and the flange plate (21, 22).
7. Conveyor head according to Claim 6, characterised by a wear-resistant ring (53) arranged so as to be exchangeable at the bulk material inlet (26) of the wear-resistant pipe (51).
8. Conveyor head according to one of the preceding claims, characterised in that the housing (16) is constructed as a cuboid case, having two walls (17, 18) which extend downwards over the bulk material inlet opening (26) and are connected below the bulk material inlet opening (26) by means of exchangeable feed regulating strips (54).
9. Conveyor head according to Claim 8, characterised in that the side walls (17, 18) taper below the feed regulating strips (54).
10. Conveyor head according to Claim 1, characterised in that the control devices comprise pressure medium cylinders (45) which are fed by a pressure medium unit (48), and in that the pressure medium unit (48) is arranged in a sealed-off space (30) connected to the housing (16) of the conveyor head (10).
11. Conveyor head according to Claim 1, having a motor-operated lifting and lowering device, characterised by an echo probe (55), which is attached to the conveyor head (10), for measuring the clearance between the echo probe and the bulk material (15) to be conveyed off and for automatic actuation of the lifting and lowering device (6, 7) in order to maintain a given clearance between the echo probe and the bulk material to be conveyed off.
EP88903817A 1987-04-28 1988-04-27 Pneumatic extraction head Expired - Lifetime EP0357652B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88903817T ATE71999T1 (en) 1987-04-28 1988-04-27 COMPRESSED AIR DELIVERY HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3714073 1987-04-28
DE19873714073 DE3714073A1 (en) 1987-04-28 1987-04-28 COMPRESSED AIR CONVEYOR HEAD

Publications (2)

Publication Number Publication Date
EP0357652A1 EP0357652A1 (en) 1990-03-14
EP0357652B1 true EP0357652B1 (en) 1992-01-22

Family

ID=6326397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88903817A Expired - Lifetime EP0357652B1 (en) 1987-04-28 1988-04-27 Pneumatic extraction head

Country Status (6)

Country Link
US (1) US4995175A (en)
EP (1) EP0357652B1 (en)
JP (1) JPH02503337A (en)
AT (1) ATE71999T1 (en)
DE (2) DE3714073A1 (en)
WO (1) WO1988008470A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7781038B2 (en) 1993-10-01 2010-08-24 Boston Scientific Scimed, Inc. Medical device balloons containing thermoplastic elastomers

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US5140759A (en) * 1991-06-14 1992-08-25 M-B-W Inc. Pneumatic device for excavating and removing material
US5285587A (en) * 1993-03-29 1994-02-15 Krenzler Leo M Underwater mining dredge
NL9400797A (en) * 1994-05-16 1996-01-02 Groot Nijkerk Maschf B V De Dredging equipment.
US5860232A (en) * 1995-12-06 1999-01-19 Concept Engineering Group, Inc. Mobile safe excavation system having a deflector plate and vacuum source
NL1022832C2 (en) * 2003-02-20 2004-08-23 Bos & Kalis Baggermaatsch Dredging device for dredging soil from earth stratum covered by upper soil layer that has to remain in situ, has pipe set having discharge unit which discharges soil, eroded by water discharged by nozzle, through pipe set
CN101560781B (en) * 2009-05-19 2011-03-23 俞建国 A dredging sucker
EP2507179A4 (en) * 2009-12-01 2014-10-15 Thomas J Kryzak Environmental remediation system
IT1403643B1 (en) * 2011-01-21 2013-10-31 Decomar S P A APPARATUS AND DEDICATION METHOD FOR THE REMOVAL OF SEDIMENTS FROM A BACKGROUND
US10156057B2 (en) * 2016-10-03 2018-12-18 Vac-Tron Equipment, Llc Rotatable hydro excavation suction wand
FR3078083B1 (en) * 2018-02-22 2020-02-21 D2E SYSTEM FOR RELEASING SEDIMENTS FROM THE BOTTOM OF WATER
CN111485595A (en) * 2020-03-30 2020-08-04 中国建筑第八工程局有限公司 Dredging construction method of underdrain robot suitable for high-airtight space environment

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US3301606A (en) * 1966-06-23 1967-01-31 Anthony I Bruno Cyclonic elevator
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7781038B2 (en) 1993-10-01 2010-08-24 Boston Scientific Scimed, Inc. Medical device balloons containing thermoplastic elastomers

Also Published As

Publication number Publication date
WO1988008470A1 (en) 1988-11-03
ATE71999T1 (en) 1992-02-15
EP0357652A1 (en) 1990-03-14
DE3714073A1 (en) 1988-11-10
US4995175A (en) 1991-02-26
JPH02503337A (en) 1990-10-11
DE3868062D1 (en) 1992-03-05

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