US20090220358A1 - Unequal length alternating hydraulic cylinder drive system for continuous material output flow with equal material output pressure - Google Patents
Unequal length alternating hydraulic cylinder drive system for continuous material output flow with equal material output pressure Download PDFInfo
- Publication number
- US20090220358A1 US20090220358A1 US12/039,926 US3992608A US2009220358A1 US 20090220358 A1 US20090220358 A1 US 20090220358A1 US 3992608 A US3992608 A US 3992608A US 2009220358 A1 US2009220358 A1 US 2009220358A1
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- Prior art keywords
- primary
- interior volume
- piston
- fluid material
- hydraulically driven
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
- F04B15/023—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
- F04B11/0075—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/1095—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers having two or more pumping chambers in series
Abstract
A hydraulic pumping system is provided for delivering a compressible fluid material from a hopper to an outlet. A primary hydraulically driven pumping unit has a first interior volume for receiving the fluid material from the hopper. A secondary hydraulically driven pumping unit is interconnected with the primary hydraulically driven pumping unit and has a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit. The primary and secondary hydraulically driven pumping units have hydraulically driven reciprocating piston units with unequal stroke lengths. The piston units are alternately reciprocated to fill the first interior volume of fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while fluid material is being pulled into the first interior volume in a sequential and simultaneous manner which will produce substantially continuous delivery of fluid material to the outlet.
Description
- The present invention relates generally to the field of pumps, and more particularly, pertains to a positive displacement pump arrangement designed to produce substantially continuous delivery of a compressible fluid material.
- Constant delivery fluid pumps find useful application in many fields. One field in which the pumps of this character are presently employed to advantage is the construction industry wherein it is relatively common practice to apply cement and plaster to building surfaces by means of spray nozzles. If a relatively uniform layer of plaster or cement material is to be applied to a building surface, the rate of flow of material from the spray nozzle of the spray unit must be relatively constant. This, in turn, requires a constant delivery pump capable of producing substantially a constant rate of material flow to the spray nozzle.
- Prior art pumps are, of course, known in the art, and are generally comprised of a pair of pumping units actuated in such a manner that the pumping discharges from the pumping units overlap in a manner to produce a substantially constant flow delivery at an outlet. Valve members are typically provided so that one pumping unit serves as a primary unit to initially discharge pumped material concurrently into a delivery line and into a cylinder of the other pumping unit which then operates as a secondary pumping unit to discharge its previously received material into the delivery line.
- One such prior art arrangement is embodied in a pair of equal stroke length material cylinders alternately driven by equal stroke length hydraulic cylinders. This arrangement requires either four separate ball and seat valves or the switching of a tube, commonly referred to as an S-tube, that changes between the material cylinders.
- Another prior art arrangement is formed by a pair of unequal stroke length material cylinders driven by a mechanical pumping assembly, in which the pumping action of the primary and secondary pumping units is effected mechanically by the interaction of a crank arm and a cam with follower. The mechanical pumping assembly can be variously driven by an engine or electric motor via a clutch, belts or chains, pulleys or sprockets, and a gearbox, all of which is undesirably complex. This design requires an external mechanical pressure limiting device. In addition, the pumping output rate is sometimes limited to preset pulley or sprocket ratios. The mechanical pumping assembly can also be variously driven by an engine or electric motor via a hydraulic pump and motor combination, but this retains the complexity and the high number of wearing components inherent to the mechanical pumping assembly.
- Accordingly, the present invention is concerned more particularly with a new and improved design of pumping apparatus in which the inherent draw backs of the prior art have been overcome. There is a need for a hydraulic equivalent to the prior art mechanical system wherein the unequal stroke length of the two material cylinders reduces the number of and simplifies components required for the pumping system, while allowing the material pressure to be equalized by controlling the pressure of the hydraulic fluid and the appropriate size combination of hydraulic cylinders.
- It is a general object of the present invention to provide a positive displacement pump in which operatively associated pumping units are interconnected hydraulically for alternating operation such that a substantially constant flow of material will be produced at an outlet.
- It is also an object of the present invention to provide a constant delivery hydraulically driven pump having primary and secondary piston/cylinder units with unequal stroke lengths, and a pair of valve members for controlling the supply of material into the pumping units and into a delivery outlet.
- It is another object of the present invention to provide a hydraulically driven pumping system having unequal stroke length material cylinders with equal material output pressure.
- It is a further object of the present invention to provide a pump apparatus which is especially suited to the pumping of cement, plastic and other abrasive materials.
- It is an additional object of the present invention to provide a hydraulically driven pumping arrangement for abrasive materials which offers improved performance, reliability and cost in installation and service.
- The present invention relates to a hydraulically driven pumping system for delivering a compressible fluid material from a hopper to an outlet. The system includes a primary hydraulically driven pumping unit having a first interior volume for receiving the fluid material from the hopper. A secondary hydraulically driven pumping unit is interconnected with the primary pumping unit and has a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit. The primary and secondary hydraulically driven pumping units have hydraulically driven reciprocating piston units with unequal stroke lengths. The piston units are alternately reciprocated to fill the first interior volume with fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while fluid material is being pulled into the first interior volume in a simultaneous and sequential manner which will produce substantially continuous delivery of fluid material to the outlet.
- In the preferred embodiment, the piston units are reciprocated in primary and secondary hydraulic cylinders of unequal lengths. The piston units are reciprocated in primary and secondary material cylinders of unequal lengths that have substantially equal output pressures. A single ball and seat combination, functioning as a check valve is positioned between the hopper and the primary hydraulically driven pumping unit. An additional single ball and seat combination functioning as a check valve is positioned between the primary hydraulically driven pumping unit and the secondary hydraulically driven pumping unit.
- In another aspect of the invention, a hydraulically driven pumping system for delivering a compressible fluid material from a hopper to an outlet includes a primary pumping unit having a primary material cylinder with a first interior volume for receiving the fluid material from the hopper, a primary hydraulic cylinder fed by a source of hydraulic fluid, and a primary piston unit movable back and forth over a stroke length within the primary material cylinder and the primary hydraulic cylinder. A secondary pumping unit has a secondary material cylinder having a second interior volume less than the first interior volume for receiving the fluid material from the primary material cylinder, a secondary hydraulic cylinder sized smaller than the primary hydraulic cylinder and fed by the source of hydraulic fluid, and a secondary piston unit movable back and forth over a stroke length within the secondary material cylinder and the secondary hydraulic cylinder. The stroke length of the secondary piston unit is less than the stroke length of the primary piston unit. A first ball and seat combination functioning as a check valve is located between the hopper and the primary material cylinder. A second ball and seat combination functioning as a check valve is located between the primary material cylinder and the secondary material cylinder. The primary and secondary piston units are hydraulically controlled and alternately reciprocated over their respective unequal stroke lengths to fill the first interior volume with fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder to the outlet, and pump the second interior volume of fluid material to the outlet while the fluid material is being pulled into the first interior volume in a simultaneous and sequential manner which will produce substantially continuous delivery of fluid material to the outlet.
- The lengths of the primary and secondary material cylinders are unequal, and the lengths of the primary and secondary hydraulic cylinders are unequal. Each of the primary and secondary piston units include a material piston adapter and a hydraulic cylinder rod having pistons on opposite ends thereof. The primary and secondary piston units have unequal hydraulic cylinder rod diameters. The hydraulic cylinder rod of the primary piston unit has a diameter that is greater than the diameter of the hydraulic cylinder rod of the secondary piston unit. The primary and secondary material cylinders have outlet pressures that are equalized by appropriately sizing the primary and second material cylinders with equal bore diameters, sizing the primary and second hydraulic cylinders with equal piston diameters and driving the primary and secondary piston units alternately by the same hydraulic pump. Sensors are included within the primary and secondary pumping units for detecting the position of the primary and secondary piston units. The primary and secondary hydraulic cylinders are hydraulically connected to each other and to a source of secondary hydraulic pump pressure. A material output rate is infinitely variable by controlling the hydraulic fluid supply to the primary and secondary hydraulic cylinders. The primary and secondary piston units have equal extension speed, but have unequal retraction speed. The volume of the primary material cylinder is substantially twice the volume of the secondary material cylinder.
- The invention also contemplates a method of delivering a substantially constant flow of fluid material from a hopper to an outlet using a hydraulic pumping system. The method comprises the step of
- (a) providing a primary hydraulically driven pumping unit having a first interior volume for receiving the fluid material from the hopper;
- (b) providing a secondary hydraulically driven pumping unit interconnected with the primary hydraulically driven pumping unit and having a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit;
- (c) providing the primary and secondary hydraulically driven pumping units with hydraulically driven reciprocating piston units with unequal stroke lengths; and
- (d) alternately reciprocating the piston units to fill the first interior volume with fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while fluid material is being pulled into the first interior volume in a sequential and simultaneous manner which will produce a substantially continuous delivery of fluid material to the outlet.
- Various other features, objects and advantages of the invention will be made apparent from the following description taken together with the drawings.
- The drawings illustrate the best mode presently contemplated for carrying out the invention.
- In the drawings:
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FIGS. 1 and 2 are schematic illustrations of an unequal length hydraulic cylinder drive system embodying the present invention and showing alternating phases of operation. - Referring to the drawings, a hydraulic
cylinder drive system 10 forms a constant delivery pump used to provide a pressurized supply of abrasive, compressible fluid material, typically cement, plaster, mortar or the like, from a reservoir or hopper 12 to anoutlet 14. Material delivered to theoutlet 14 is normally directed to a spray nozzle for distribution to a desired surface, such as a building wall. - The
system 10 includes a primary hydraulically driven pumping unit defined by aprimary material cylinder 16 have afeed line 18 in communication withinhopper 12 and an interior volume A at a head of thecylinder 16. A first one-way check valve 20 is positioned infeed line 18 betweenhopper 12 andprimary material cylinder 16. Thecheck valve 20 is a conventional mechanical design having aball 22 movable between astop 24 and aseat 26. Thecheck valve 20 allows flow of material fromhopper 12 intomaterial cylinder 16 through theline 18, but blocks flow in the reverse direction. - A
primary piston unit 28 has amaterial piston adapter 30 with amaterial piston 32 movable within the interior ofprimary material cylinder 16, and ahydraulic cylinder rod 34 with asecond piston 36opposite material piston 32 that is movable within an interior of primaryhydraulic cylinder 38. As will be appreciated,piston adapter 30,hydraulic cylinder rod 34, andpistons primary material cylinder 16 and primaryhydraulic cylinder 38.Primary piston unit 28 has a particular stroke length as determined by the lengths ofprimary material cylinder 16 and primaryhydraulic cylinder 38. One end of primaryhydraulic cylinder 38 is provided with ahydraulic line 40 connected to a primary hydraulic pump for supplying and returning hydraulic fluid relative to a source. Flow of hydraulic fluid throughfeed line 40 is separately controlled. - The
system 10 further includes a secondary hydraulically driven pumping unit defined by asecondary material cylinder 42 having afeed line 44 in communication with an interior volume B at a head ofcylinder 42. Thefeed line 44 is further in communication with theline 18 extending from theprimary material cylinder 16. A second one-way check valve 46 is positioned inline 44 betweenprimary material cylinder 16 and thesecondary material cylinder 42. Thecheck valve 46 is a conventional design likecheck valve 20 having aball 48 movable between astop 50 and aseat 52. Thecheck valve 46 allows flow fromline 18 intoline 44, thesecondary material cylinder 42 andoutlet 14, but prevents flow back intoline 18. - It is important to note that
secondary material cylinder 42 has a length that is shorter than the length ofprimary material cylinder 16, and that interior volume B ofsecondary material cylinder 42 is less than interior volume A ofprimary material cylinder 16. Interior diameters of thematerial cylinders - A
secondary piston unit 54 has amaterial piston adapter 56 with amaterial piston 58 movable within the interior ofsecondary material cylinder 42, and ahydraulic cylinder rod 60 with ahydraulic cylinder piston 62opposite material piston 58 that is movable within an interior of a secondaryhydraulic cylinder 64.Piston adapter 56,hydraulic cylinder rod 60 andpistons secondary material cylinder 42 and secondaryhydraulic cylinder 64.Secondary piston unit 54 has a particular stroke length as determined by the length of secondaryhydraulic cylinder 64. It is a key feature of the invention that the stroke length ofsecondary piston unit 54 is less than the stroke length ofprimary piston unit 28. - Secondary
hydraulic cylinder 64 has a length which is shorter than the length of primaryhydraulic cylinder 38, and an interior volume which is less than the interior volume of primaryhydraulic cylinder 38. Diameters of thehydraulic cylinder pistons - One end of secondary
hydraulic cylinder 64 is provided with ahydraulic line 66 connected to a primary hydraulic pump for supplying and returning hydraulic fluid relative to the source. A rod side of secondaryhydraulic cylinder 64 is hydraulically connected with a rod side end of primaryhydraulic cylinder 38 by means of acommon line 68. A furtherhydraulic line 70 is connected to line 68 and to a secondary hydraulic pump for supplying and returning hydraulic fluid relative to the rod side ofhydraulic cylinders Proximity sensors material cylinders piston units proximity sensors hydraulic cylinders piston units - It is another key feature of the present invention that the diameter of the
hydraulic cylinder rod 34 in primaryhydraulic cylinder 38 is greater than the diameter of thehydraulic cylinder rod 60 of the secondaryhydraulic cylinder 64 as will be fully appreciated below. - Operation of the
system 10 as described above is as follows referring first toFIG. 1 . Material to be pumped is placed in thehopper 12. A primary hydraulic pump is connected to the piston side ofhydraulic cylinder 64 vialine 66 causingsecondary piston unit 54 to extend. Thehydraulic connection 68 from the rod side ofhydraulic cylinder 64 to the rod side ofhydraulic cylinder 38 causesprimary piston unit 28 to retract. The retraction ofpiston unit 28 causes material to be drawn intoprimary material cylinder 16 from thehopper 12past ball 22 andseat 26 and throughline 18. At the full extension ofpiston unit 54, theproximity sensor piston units - Referring now to
FIG. 2 , the primary hydraulic pump flow changes from being directed to the piston side ofhydraulic cylinder 64 to the piston side ofhydraulic cylinder 38.Piston unit 28 extends causing approximately half the material withinmaterial cylinder 16 to be pumped out of theoutlet 14, while the other half is pumped intomaterial cylinder 42 aspiston unit 54 is retracted. Retraction is caused due to thecommon line 68 from the rod side ofhydraulic cylinder 38 to the rod side ofhydraulic cylinder 64. Retraction is further assisted by the action of pumping material frommaterial cylinder 16 tomaterial cylinder 42. The retraction ofpiston unit 54 causes material to be drawn intomaterial cylinder 42 frommaterial cylinder 16 past theball 48 andseat 52 and throughline 44. At the full extension ofpiston unit 28, theproximity sensor piston units hydraulic cylinder 38 to the piston side ofhydraulic cylinder 64.Piston unit 54 extends causing its full volume of material inmaterial cylinder 42 to be pumped out theoutlet 14. Material is prevented from back flowing intoline 18 bycheck valve 46. Thepiston unit 28 is simultaneously retracted. The above steps are repeated to provide a substantially continuous flow of material to theoutlet 14. - During operation,
piston units piston unit 28 having a longer stroke length than thepiston unit 54. Thecommon line 68 establishes a master-slave relationship and allows for transfer of fluid between thehydraulic cylinders piston units material cylinder 16, approximately one-half the volume is pumped intomaterial cylinder 42 and the other half is pumped out tooutlet 14. When pumping frommaterial cylinder 42, its full volume is pumped out theoutlet 14. -
Piston units Hydraulic cylinders equal diameter pistons piston units piston units piston unit other piston unit stroke piston unit 28 retracts at a faster speed than thepiston unit 54 extends.Piston unit 54 retracts at a slower speed thanpiston unit 28 extends. This is accomplished by therods rod 34 is greater than the diameter ofrod 60. This is further accomplished by making thehydraulic cylinders secondary piston unit 54 may be increased with the addition of material pressure being pumped from theprimary piston unit 28. - The
piston units proximity sensors piston units hydraulic cylinders lines piston units - Material output rate is infinitely variable by controlling the primary pump flow delivered to
hydraulic cylinders material cylinders material cylinders hydraulic cylinders equal diameter pistons hydraulic cylinders - The present invention thus provides a positive displacement hydraulic cylinder drive system wherein a partial volume A and volume B of material are pumped on each alternating, unequal length stroke of coordinating
piston units outlet 14. In contrast with the prior art, thesystem 10 reduces the number of components required (minimizing the number of check valves), eliminates the need for complex drive systems and separate mechanical pressure limiting devices as encountered in mechanical systems, and allows a greater control of the maximum pressure of the material cylinders. - It should be understood that the
hydraulic system 10 can be either an open loop or a closed loop system. For the purpose of detecting and signaling change of direction of the piston units, the type, the amount and/or location of the proximity sensor may vary. Also, the change in direction could be detected alternately using hydraulic pressure signals and correspondingly piloted valves. - Various alternatives and embodiments are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter regarded as the invention.
Claims (19)
1. A hydraulically driven pumping system for delivering a compressible fluid material from a hopper to an outlet, the system comprising:
a primary hydraulically driven pumping unit having a first interior volume for receiving the fluid material from the hopper; and
a secondary hydraulically driven pumping unit interconnected with the primary hydraulically driven pumping unit and having a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit,
the primary and secondary hydraulically driven pumping units having hydraulically driven reciprocating piston units with unequal stroke lengths, the piston units being alternately reciprocated to fill the first interior volume with fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while fluid material is being pulled into the first interior volume in a simultaneous and sequential manner which will produce substantially continuous delivery of fluid material to the outlet.
2. The pumping system of claim 1 , wherein the piston units are reciprocated in primary and secondary hydraulic cylinders having equal bores, unequal lengths, and pistons with equal diameters.
3. The pumping system of claim 1 , wherein the piston units are reciprocated in primary and secondary material cylinders having equal bores, unequal lengths that have substantially equal output pressures, and pistons with equal diameters.
4. The pumping system of claim 1 , wherein a single check valve is positioned between the hopper and the primary pumping unit.
5. The pumping system of claim 4 , wherein a single check valve is positioned between the primary pumping unit and the secondary pumping unit.
6. A hydraulically driven pumping system for delivering a compressible fluid material from a hopper to an outlet, the system comprising:
a primary hydraulically driven pumping unit having a primary material cylinder having a piston, a bore and a first interior volume for receiving the fluid material from the hopper, a primary hydraulic cylinder provided with a piston, and a bore and fed by a source of hydraulic fluid and a primary piston unit movable back and forth over a stroke length within the primary material cylinder and the primary hydraulic cylinder;
a secondary hydraulically driven pumping unit having a secondary material cylinder having a piston, a bore and a second interior volume less than the first interior volume for receiving the fluid material from the primary material cylinder, a secondary hydraulic cylinder provided with a piston and a bore and sized smaller than the primary hydraulic cylinder and fed by the source of hydraulic fluid, and a secondary piston unit movable back and forth over a stroke length within the secondary material cylinder and the secondary hydraulic cylinder, a stroke length of the secondary piston unit being less than the stroke length of the primary piston unit;
a first check valve located between the hopper and the primary material cylinder; and
a second check valve located between the primary material cylinder and the secondary material cylinder,
wherein the primary and secondary piston units are hydraulically controlled and alternately reciprocated over their respective unequal stroke lengths to fill the first interior volume with fluid material from the hopper, pump a portion of the first material volume of first interior volume of fluid material into the second interior volume and the remainder to the outlet, and pump the second interior volume of fluid material to the outlet while the fluid material is being pulled into the first interior volume in a sequential and simultaneous manner which will produce substantially continuous delivery of fluid material to the outlet.
7. The pumping system of claim 6 , wherein the primary and second material cylinders have equal bore and piston diameters and unequal lengths.
8. The pumping system of claim 6 , wherein the primary and secondary hydraulic cylinders have equal bore and piston diameters and unequal lengths.
9. The pumping system of claim 6 , wherein each of the primary and secondary piston units include material piston adapters and hydraulic cylinder rods.
10. The pumping system of claim 9 , wherein the hydraulic cylinder rods of the primary and secondary piston units have unequal diameters and lengths.
11. The pumping system of claim 9 , wherein the hydraulic cylinder rod of the primary piston unit has a diameter that is greater than a diameter of the hydraulic cylinder rod of the secondary piston unit.
12. The pumping system of claim 6 , wherein the primary and secondary material cylinders have outlet pressures that are equalized by appropriately sizing the primary and secondary material cylinders with equal bore and piston diameters, sizing the primary and secondary hydraulic cylinders with equal bore and piston diameters, and driving the primary and secondary piston units alternately by the same hydraulic pump.
13. The pumping system of claim 6 , wherein proximity sensors are included within the primary and secondary pumping units for detecting a fully extended position of the primary and secondary piston units.
14. The pumping system of claim 6 , wherein the primary and secondary hydraulic cylinders are hydraulically connected to each other and to a source of secondary hydraulic pump pressure.
15. The pumping system of claim 6 , wherein the material output rate is infinitely variable by controlling the hydraulic fluid supplied to the primary and secondary hydraulic cylinders.
16. The pumping system of claim 6 , wherein the primary and secondary piston units have equal extension speed.
17. The pumping system of claim 6 , wherein the primary and secondary piston units have unequal retraction speed.
18. The pumping system of claim 6 , wherein the volume of the primary material cylinder is substantially twice the volume of the secondary material cylinder.
19. A method of delivering a substantially constant flow of fluid material from a hopper to an outlet using a hydraulically driven pumping system, the method comprising the steps of:
a) providing a primary hydraulically driven pumping unit having a first interior volume for receiving the fluid material from the hopper;
b) providing a secondary hydraulically driven pumping unit interconnected with the primary hydraulically driven pumping unit and having a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit;
c) providing the primary and secondary hydraulically driven pumping units with hydraulically driven reciprocating piston units with unequal stroke lengths; and
d) alternately reciprocating the piston units to fill the first interior volume with fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while the fluid material is being pulled into the first interior volume in a sequential and simultaneous manner which will produce substantially continuous delivery of fluid material to the outlet.
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US12/039,926 US20090220358A1 (en) | 2008-02-29 | 2008-02-29 | Unequal length alternating hydraulic cylinder drive system for continuous material output flow with equal material output pressure |
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US12/039,926 US20090220358A1 (en) | 2008-02-29 | 2008-02-29 | Unequal length alternating hydraulic cylinder drive system for continuous material output flow with equal material output pressure |
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US12/039,926 Abandoned US20090220358A1 (en) | 2008-02-29 | 2008-02-29 | Unequal length alternating hydraulic cylinder drive system for continuous material output flow with equal material output pressure |
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Cited By (8)
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US7914499B2 (en) | 2006-03-30 | 2011-03-29 | Valeritas, Inc. | Multi-cartridge fluid delivery device |
US8070726B2 (en) | 2003-04-23 | 2011-12-06 | Valeritas, Inc. | Hydraulically actuated pump for long duration medicament administration |
ITMI20101482A1 (en) * | 2010-08-03 | 2012-02-04 | Cifa Spa | PUMPING GROUP FOR A CONCRETE DISTRIBUTION MACHINE |
US9089636B2 (en) | 2004-07-02 | 2015-07-28 | Valeritas, Inc. | Methods and devices for delivering GLP-1 and uses thereof |
US20190226465A1 (en) * | 2018-01-20 | 2019-07-25 | William E. Howseman, Jr. | Hydraulically synchronized pumps where the hydraulic motor of the master pump hydraulically drives the hydraulic motor of the slave pump |
IT201900022443A1 (en) * | 2019-11-29 | 2021-05-29 | Nello Nalesso | automatic opening and closing system for dosing pump in the food sector |
US11248599B2 (en) | 2018-09-28 | 2022-02-15 | Julio Vasquez | System for monitoring concrete pumping systems |
US11959469B2 (en) | 2019-08-22 | 2024-04-16 | Putzmeister Engineering Gmbh | Method for monitoring the state of a device and device |
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