WO2006103219A1 - Circuit hydraulique pour une unite de pompage de beton - Google Patents

Circuit hydraulique pour une unite de pompage de beton Download PDF

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Publication number
WO2006103219A1
WO2006103219A1 PCT/EP2006/061075 EP2006061075W WO2006103219A1 WO 2006103219 A1 WO2006103219 A1 WO 2006103219A1 EP 2006061075 W EP2006061075 W EP 2006061075W WO 2006103219 A1 WO2006103219 A1 WO 2006103219A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
command
oil
actuators
hydraulic
Prior art date
Application number
PCT/EP2006/061075
Other languages
English (en)
Inventor
Stefano Baiardo
Original Assignee
Stefano Baiardo
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stefano Baiardo filed Critical Stefano Baiardo
Publication of WO2006103219A1 publication Critical patent/WO2006103219A1/fr

Links

Classifications

    • 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
    • F04B9/117—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 the pumping members not being mechanically connected to each other
    • F04B9/1176—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 the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178—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 the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
    • 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
    • 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
    • F04B9/117—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 the pumping members not being mechanically connected to each other
    • F04B9/1172—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 the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor

Definitions

  • the present invention concerns a hydraulic circuit able to command in a coordinated manner two pairs of actuators of a pumping unit used in an apparatus to distribute concrete.
  • a first pair of actuators is able to alternately pump a determinate quantity of concrete
  • a second pair of actuators is able to alternately position, and in a manner coordinated with the pumping, the terminal part of a pipe for delivering the concrete in correspondence with one or the other of the actuators of the fist pair, which is pumping the concrete.
  • Hydraulic circuits associated with units for pumping concrete are known, used to pump concrete and installed on heavy work vehicles employed in the building sector, both to command two pairs of actuators able to pump the concrete alternately, and also to move a delivery pipe in a coordinated manner.
  • Said heavy work vehicles normally comprise a lorry or truck, on which one or more building devices are installed, such as for example pumpmixers, concrete pumps or others.
  • known circuits comprise a hydraulic pump that, by means of a pipe, feeds oil to the actuators, a plurality of electro valves, and other electric and electronic components which divert the flow of oil, so as to drive in coordination the actuators for pumping, and alternately move the delivery pipe in correspondence with the actuator that is actually pumping the concrete.
  • this first type of circuit provides various electric end- of-travel consent devices, or electro valves, located in proximity with the actuators themselves. Moreover, these electro-hydraulic devices can be necessary to pass from the concrete-pumping function to the function recall to the hopper .
  • a. provided with a hydraulic pump with a single or double action that causes the continuous circulation of the oil in the actuators.
  • electro valves and or electrical end-of-travel devices are provided, which divert the circulation of the oil in synchronized manner in the various actuators;
  • b. provided with two pumps, a first hydraulic pump that commands the actuator cylinders which thrust the concrete, and a second hydraulic pump that commands, in a separate hydraulic circuit, the actuators that alternately move the pipe that distributes the concrete.
  • the pumping actuators and the other components of the pumping unit are frequently subjected to washing, so as to prevent incrustations .
  • One purpose of the present invention is to achieve a simple and functional hydraulic circuit which allows to coordinate the movement of the pumping actuators and the delivery pipe without providing electric or electronic components .
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages .
  • a hydraulic circuit for a pumping unit for concrete according to the present invention is able to command in coordinated manner a plurality of actuators of the pumping unit.
  • the actuators can be divided into two pairs, wherein a first pair is able to alternately pump the concrete towards a delivery pipe, while the second pair is able to displace the delivery pipe in correspondence with the actuator of the first pair that effects the pumping, so as to have a substantially continuous flow of concrete inside the delivery pipe.
  • the hydraulic circuit comprises pumping means of the oil-dynamic type connected to the actuators, distribution means able to alternately drive the actuators, and command means able to command the distribution means, so as to coordinate the alternate actuation of the actuators.
  • the command means are of the oil-dynamic type and use the same fluid circulating in the pumping means both for the pumping functions and also for the suction functions.
  • the hydraulic circuit according to the invention is able to coordinate autonomously the alternate actuation of the actuators, and since it uses totally hydraulic components fed in common by the pumping means, it is therefore not necessary to have auxiliary electronic elements, such as end-of-travel elements or suchlike, in order to coordinate the alternate movement of the actuators .
  • the coordination of drive of the actuators can also be done manually, for example using a pump with a variable flow rate, selectively invertible by means of a manual command lever.
  • the distribution means comprises a first distributor member that alternately drives a first and a second of the actuators, and a second distributor member that alternately drives a third and a fourth of the actuators.
  • the command means comprises at least a command pipe that connects the first actuator and the second actuator to the second distributor member, and the third and fourth actuator to the first distributor member.
  • the alternate movement of the first and second actuator determines the coordinated command of the fourth actuator and the third actuator, so as to keep the four actuators always in the correct alternation of movement.
  • the command means also comprises, connected to the command circuit, two command valves, also of the oil-dynamic type, associated respectively with the front part and rear part of the first actuator.
  • the command to the second distributor member to move the third and fourth actuator only takes place when inside the front or rear zone of the first cylinder a determinate pressure of the circulating fluid is reached.
  • the hydraulic circuit according to the present invention while being precise and reliable, consists of a limited number of components, and thus has reduced production and maintenance costs compared with solutions known in the state of the art.
  • - fig. 2 is a functioning diagram of the hydraulic circuit according to the present invention in a first operating step
  • - fig. 3 is a functioning diagram of the hydraulic circuit in fig. 2 in a second operating step
  • - fig. 4 is a functioning diagram of the hydraulic circuit in fig. 2 in a third operating step
  • - fig. 5 is a functioning diagram of the hydraulic circuit in fig. 2 in a fourth operating step.
  • the attached drawings show a hydraulic circuit 10 according to the present invention, able to command a pumping unit 11 installed in a heavy work vehicle 12, in this case provided with a distribution arm, otherwise known as placing boom, 17 associated with a delivery pipe 19, for casting concrete during the construction of buildings.
  • the heavy vehicle 11 also comprises a truck 13 mobile on wheels 14 and provided with a cabin 15, a supporting frame 16 on which the pumping unit 11 is mounted.
  • the pumping unit 11 comprises a tank 18 to collect the concrete, a first actuator 20 and a second actuator 21 which alternately pump the concrete present in the tank inside the delivery pipe 19, and a third actuator
  • the first actuator 20 and the second actuator 21 are of the linear type, and the respective pistons 20a and 21a are antagonist: that is, when one is in thrust or pumping mode, the other is in suction mode.
  • This antagonist condition is maintained by means of a hydraulic connection 24 which connects the two actuators 20 and 21 at the rear.
  • the respective pistons 22a and 23a, of the third actuator 22 and the fourth actuator 23, are antagonist with respect to each other, but in this case this condition is maintained by the respective rods 22b and 23b, attached on opposite sides of the terminal part 19a of the delivery pipe 19.
  • the hydraulic circuit 10 comprises, connected to the pumping unit 11, an oil-dynamic pump 25, two hydraulic distributors 26 and respectively 27, and two logic valves 29 and respectively 30, also of an oil-dynamic type.
  • the hydraulic circuit 10 also comprises a drive pipe 33, a command pipe 35, two power factor correction valves 31 and respectively 32, and two non-return valves 36 and respectively 37.
  • the drive pipe 33 consists of two segments 33a and 33b, in each which the oil can flow in both directions, according to the direction of delivery of the oil-dynamic pump 25.
  • the segments 33a and 33b are connected to the four actuators 20, 21, 22 and 23, and to the two hydraulic distributors 26 and 27, while the command pipe 35 consists of a first hydraulic pilot circuit 35a which connects the logic valves 29 and 30 to respective command valves 45, 46 of the hydraulic distributor 27, and a second hydraulic pilot circuit 35b, independent of the hydraulic pilot circuit 35a, which connects the third actuator 22 and the fourth actuator 23 to respective command valves 42, 43 of the hydraulic distributor 26.
  • the connections between the drive pipe 33 and the relative components of the circuit 10, and between the command pipe 35 and the relative components of the circuit 10, are such as to allow the oil pumped by the oil-dynamic pump 25 to flow both in the drive pipe 33 and also in the command pipe 35.
  • the oil-dynamic pump 25 is of the type with a closed circuit with variable flow rate, is commanded by a relative service pump 39 and is regulated at a pressure of about 20 bar.
  • Two respective maximum pressure valves 40 and respectively 41 are also associated with the oil-dynamic pump 25, which allow to regulate the maximum pressure of the oil circulating in the drive pipe 33.
  • Each of the two hydraulic distributors 26 and 27 is connected, as we said, to the drive pipe 33 and is hydraulically commanded by the command pipe 35. Moreover, each hydraulic distributor 26, 27 can selectively assume two distinct connection positions, that is, a first position in which it keeps the segment 33a separate from the segment 33b, imposing a determinate direction of drive on the actuators 20, 21, 22 and 23, and a second position in which it allows the oil to pass from the segment 33a to the segment 33b, in order to invert the direction of drive of the actuators 20, 21, 22 and 23. To be more exact, the hydraulic distributor 26 commands the first actuator 20 and the second actuator 21, while the hydraulic distributor 27 commands the third actuator 22 and the fourth actuator 23.
  • the logic valve 29 is connected, on one side, to the front part of the first actuator 20 and, on the other side to the command valve 45 of the hydraulic distributor 27, so that, when the first actuator 20 is in the thrust step, and the pressure of the oil in its front part reaches a determinate value, that is, when it is substantially at the end of its travel, the logic valve 29 opens, determining the passage of the distributor 27 from its first position to its second position.
  • the logic valve 30 is connected, on one side, to the rear part of the first actuator 20 and on the other side to the command valve 46 of the hydraulic distributor 27 so that, when the first actuator 20 is in the suction phase, and the pressure of the oil in the rear part reaches a determinate value, that is, when it is substantially at the end of its travel, the logic valve 30 opens, determining the passage of the distributor 27 from its second position to its first position.
  • the two power factor correction valves 31 and 32 are connected to the front part and respectively to the rear part of the second actuator 21, and automatically maintain the correct quantity of oil in the first actuator 20 and the second actuator 21.
  • the non-return valve 36 is connected to the oil-dynamic outlet of the third actuator 22 and commands the piloting of the oil to the command valve 42 of the hydraulic distributor 26, so that when the third actuator 22 is in the thrust step, we have the passage of the distributor 26 from its second position to its first position.
  • the non-return valve 37 is connected to the oil-dynamic outlet of the fourth actuator 23 and commands the piloting of the oil to the command valve 43 of the hydraulic distributor 26, so that when the fourth actuator 23 is in the thrust step, we have the passage of the distributor 26 from its first position to its second position.
  • the hydraulic circuit 10 also comprises other hydraulic components, such as for example filters for the oil, manometers, suction pipes, tanks to contain oil and others, of a substantially known type and not described in detail here.
  • the hydraulic circuit 10 as described heretofore functions as follows .
  • the pipes of the hydraulic circuit 10 in which the oil is under pressure have been drawn with a thicker line compared with the pipes where the oil is in the phase of returning towards the oil- dynamic pump 25.
  • the hydraulic distributor 26 is in the first position, while the hydraulic distributor 27 is in the second position.
  • the oil is pumped by the oil-dynamic pump 25 into the segment 33a and, due to the effect of the positioning of the two hydraulic distributors 26 and 27, the first actuator 20 and the fourth actuator 23 are simultaneously fed.
  • This feed entails a suction step by the first actuator 20, with a consequent thrust step by the second actuator 21, and a thrust step by the fourth actuator 23, with a consequent return of the third actuator 22.
  • the oil exiting from the fourth actuator 23, by means of the command valve 43 keeps the hydraulic distributor 26 in its first position.
  • the logic valve 30 opens (fig. 3), so as to command, by means of the command valve 46, the displacement of the hydraulic distributor 26 from its second position to its first position.
  • the oil is fed to the third actuator 22 instead of the fourth actuator 23, with a consequent passage of the third actuator 22 from the return step to the thrust step.
  • the oil exiting from the third actuator 22, by means of the command valve 42 commands the hydraulic distributor 26 to pass from its second position to its first position, thus entailing the feed of the second actuator 21.
  • the terminal part 19a of the delivery pipe 19 is taken by the third actuator 22 towards the left, that is, to the side of the first actuator 20.
  • the first actuator 20 passes from the suction step to the thrust or pumping step and, vice versa, the second actuator 21 passes from the thrust or pumping step to the suction step.
  • the logic valve 29 opens so as to command, by means of the command valve 45, the displacement of the hydraulic distributor 27 from its first position to its second position, entailing the feed of the fourth actuator 23 instead of the third actuator 22.
  • the third actuator 22, or the fourth actuator 23 can be absent, providing a single actuator which moves the terminal part 19a of the delivery pipe 19.
  • logic valve 30 can be connected to the front part of the second actuator 21 instead of to the rear part of the first actuator 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un circuit hydraulique (10) pour une unité de pompage de béton (11), comportant une pluralité d'actionneurs (20, 21, 22, 23). Ce circuit hydraulique (10) comprend des éléments de pompage (25) du type dynamique hydraulique connectés aux actionneurs (20, 21, 22, 23), des éléments de distribution (26, 27) entraînement alternativement les actionneurs (20, 21, 22, 23) et des éléments de commande (29, 30, 35) commandant les éléments de distribution (26, 27), afin de coordonner l'actionnement alterné des actionneurs (20, 21, 22, 23). Les éléments de commande sont du type dynamique hydraulique et utilisent le même fluide circulant dans les éléments de pompage (25) à la fois pour les fonctions de pompage et pour les fonctions d'aspiration.
PCT/EP2006/061075 2005-03-29 2006-03-28 Circuit hydraulique pour une unite de pompage de beton WO2006103219A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20050045 ITUD20050045A1 (it) 2005-03-29 2005-03-29 Circuito idraulico per un gruppo di pompaggio di calcestruzzo
ITUD2005A000045 2005-03-29

Publications (1)

Publication Number Publication Date
WO2006103219A1 true WO2006103219A1 (fr) 2006-10-05

Family

ID=36390159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/061075 WO2006103219A1 (fr) 2005-03-29 2006-03-28 Circuit hydraulique pour une unite de pompage de beton

Country Status (2)

Country Link
IT (1) ITUD20050045A1 (fr)
WO (1) WO2006103219A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106014903A (zh) * 2015-12-07 2016-10-12 巩长勇 双缸稳流输送泵及采用这种双缸稳流输送泵的拖泵和泵车

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327641A (en) * 1965-03-08 1967-06-27 Air Placement Equipment Co Inc Concrete pump
US4105373A (en) * 1974-11-12 1978-08-08 Fogt Industriemaschinenvertretung A.G. Fluid distributor device for controlling an apparatus for pumping wet concrete and the like
EP0167635A1 (fr) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Circuit hydraulique pour le contrôle de pompes à piston alternatif
US6171075B1 (en) * 1995-11-13 2001-01-09 Putzmeister Ag Process and device for controlling a two-cylinder thick medium pump
US20010031212A1 (en) * 1999-08-17 2001-10-18 Schwing America, Inc. Hydraulic displacement pump having two stroke length

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327641A (en) * 1965-03-08 1967-06-27 Air Placement Equipment Co Inc Concrete pump
US4105373A (en) * 1974-11-12 1978-08-08 Fogt Industriemaschinenvertretung A.G. Fluid distributor device for controlling an apparatus for pumping wet concrete and the like
EP0167635A1 (fr) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Circuit hydraulique pour le contrôle de pompes à piston alternatif
US6171075B1 (en) * 1995-11-13 2001-01-09 Putzmeister Ag Process and device for controlling a two-cylinder thick medium pump
US20010031212A1 (en) * 1999-08-17 2001-10-18 Schwing America, Inc. Hydraulic displacement pump having two stroke length

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106014903A (zh) * 2015-12-07 2016-10-12 巩长勇 双缸稳流输送泵及采用这种双缸稳流输送泵的拖泵和泵车

Also Published As

Publication number Publication date
ITUD20050045A1 (it) 2006-09-30

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