WO2003101881A1 - Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative - Google Patents

Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative Download PDF

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Publication number
WO2003101881A1
WO2003101881A1 PCT/CN2003/000130 CN0300130W WO03101881A1 WO 2003101881 A1 WO2003101881 A1 WO 2003101881A1 CN 0300130 W CN0300130 W CN 0300130W WO 03101881 A1 WO03101881 A1 WO 03101881A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic
oil
hydraulic cylinder
control
port
Prior art date
Application number
PCT/CN2003/000130
Other languages
English (en)
Chinese (zh)
Inventor
Xuanzhe Hu
Zhenhua Hu
Aiwu Hu
Original Assignee
Xuanzhe Hu
Zhenhua Hu
Aiwu Hu
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 Xuanzhe Hu, Zhenhua Hu, Aiwu Hu filed Critical Xuanzhe Hu
Priority to AU2003211851A priority Critical patent/AU2003211851A1/en
Publication of WO2003101881A1 publication Critical patent/WO2003101881A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/26—Adaptations or arrangements of pistons
    • B66F3/28—Adaptations or arrangements of pistons telescopic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Definitions

  • the invention relates to a control method and a control device for a hydraulic tool for lifting a load, in particular to a control method and a device for a hydraulic tool that can be repeatedly loaded in place without load.
  • the known hydraulic jack also has defects such as partial incoordination and complicated structure.
  • the technical problem to be solved by the present invention is to provide a control method and a control device for a hydraulic machine that can store energy in stages, is easy to operate, has a coordinated control, a large working stroke, and can be repeatedly and automatically placed at no load.
  • the technical solution of the present invention is: a control method of a hydraulic tool repeatedly in place, which uses a hydraulic control element to control a high-pressure accumulator connected to a rod cavity of a hydraulic cylinder and a low-pressure accumulator connected to a rod-less cavity, respectively.
  • Graded energy storage enables the hydraulic oil rainbow to be lifted automatically and repeatedly into position when the hydraulic machine is started without load; when unloaded, the hydraulic fluid in the rodless cavity of the hydraulic pump enters the high-pressure accumulator for energy storage; said hydraulic machine When entering the normal state, the hydraulic oil in the rodless cavity of the hydraulic cylinder is introduced into the low-pressure accumulator, which is used as the energy for the automatic load in place at the next operation.
  • the connection between the lifting port of the rodless cavity of the hydraulic cylinder and the low-pressure-level accumulator is disconnected, so that the high-pressure-level accumulator and the rodless cavity of the hydraulic cylinder are conducted.
  • the low-pressure accumulator and the high-pressure accumulator release energy to the rodless cavity of the hydraulic cylinder at the same time, so that the no-load state of the hydraulic machine can be automatically in place.
  • the lifting port of the rodless cavity of the hydraulic cylinder is controlled to communicate with a low-pressure accumulator, the high-pressure accumulator has a rod cavity to release energy to the hydraulic cylinder, and the pressure drop hydraulic cylinder is automatically reset.
  • the hydraulic oil enters the low-pressure accumulator for energy storage through the lifting port of the rodless cavity of the hydraulic cylinder.
  • the control device for implementing the above control method includes a hydraulic cylinder, an oil pump, a high-pressure stage accumulator, a low-pressure stage accumulator, and a hydraulic control circuit; wherein the high-pressure stage accumulator is connected to a rod cavity of the hydraulic cylinder, The low-pressure accumulator is connected to a rodless cavity of a hydraulic cylinder, and the hydraulic control circuit is composed of a two-position two-way oil return rotary valve connected to a double control check valve and a hydraulic control check valve; wherein the oil return The first port of the rotary valve is connected to the rodless cavity of the hydraulic cylinder and the A first valve port, a second valve port thereof, respectively, an oil inlet of a rodless cavity of a hydraulic cylinder, a low-pressure accumulator, a second valve port of a hydraulic check valve and an oil pump, The valve port is connected to the first valve port of the hydraulically controlled one-way valve, and at the same time connected to the high-pressure stage accumulator via a pipeline, and
  • the valve core of the two-position two-way oil return rotary valve is connected with the valve body through a screw thread at a large diameter, and the valve body is tightly fitted with the valve shaft at the small diameter.
  • a hook-shaped groove is provided, and a through hole is provided in the center of the valve core, and a control jack is provided therein.
  • the jack has an extended end, which is disposed in the hook-shaped groove.
  • a power control mechanism is connected, and the front end of the ejector is the control end of the first valve port of the dual-control check valve.
  • control device of the repeatedly-positioned hydraulic implement further includes a control spring provided between the first valve port of the hydraulically controlled check valve and the second valve port of the double-controlled check valve.
  • the repeatedly-in-place hydraulic implement control device has the power control mechanism having two supports provided on the valve body, a handle tube seat is hinged with the two supports, and a handle is rotatably sleeved on the handle tube seat.
  • the handle tube base Inside, and connected with the rear end of the above-mentioned ejector rod; the handle tube base has a bent and extended power arm, and the power arm is connected with the oil pump.
  • a flexible shaft is connected between the handle and the ejector.
  • the handle and the ejector rod can also be connected by a universal joint.
  • the bottom of the hydraulic implement is provided with wheels.
  • the hydraulic cylinder has a two-stage piston, a bottom plate of the first-stage piston is provided with a positioning plate, the positioning plate is provided with a plurality of through holes, and the second-stage piston is sleeved In the first-stage piston, one end of a return spring is fixed to the top of the second-stage piston, and the other end is fixed to a positioning plate at the bottom of the first-stage piston.
  • valve core of the oil return rotary valve is connected with a power control mechanism.
  • the power control mechanism has two supports arranged on the valve body, a handle pipe socket is hinged with the two supports, and a handle is rotatably sleeved.
  • the handle pipe seat is arranged in the handle pipe seat and is connected with the valve core of the oil return rotary valve; the handle pipe seat has a bent and extended power arm, and the power arm is connected with the oil pump.
  • the working principle of the invention is: In the no-load starting state, the pressure oil in the high-pressure accumulator and the low-pressure accumulator connected to the rod cavity and the non-rod cavity of the hydraulic cylinder are respectively controlled by a hydraulic control element through a hydraulic control element.
  • the hydraulic differential circuit releases energy to the rodless cavity of the hydraulic cylinder at the same time, and the push piston is automatically in place repeatedly.
  • the piston is pressure-dropped by the load lifted by the hydraulic cylinder.
  • the hydraulic cylinder Under the control of the hydraulic control element, the hydraulic cylinder is forced to The oil in the rod cavity enters the high-pressure stage accumulator for energy storage through the differential circuit, and recovers the energy dropped by the load for use in the next operation cycle when the no-load is automatically in place.
  • the features and advantages of the present invention are: Because the present invention uses high and low pressure energy accumulators, when the high pressure energy accumulator releases energy to the hydraulic cylinder's rod cavity, and the pressure drop piston is in place, the hydraulic cylinder has no rod cavity. The oil enters the low-pressure stage accumulator to store energy, which is used to lift the piston again without load and automatically in place, thereby achieving effective energy conversion and making full use of energy.
  • the above control method and device overcome the problem of oil leakage from the gas tank breathing port in the known technology.
  • the hydraulic circuit structure has a single cylinder, good sealing performance, and accurate and reliable movement. By operating the handle, the oil pump and the oil return rotary valve can be controlled in combination to operate the bowl.
  • the invention adopts a two-stage Han-acting oil cylinder, which is as stable as a pagoda and has a large lifting stroke. Because the secondary cylinder is automatically reset by a tension spring using a secondary piston, it ensures that the no-load process is in place. The primary piston is raised first, and the secondary piston is raised later.
  • the invention is provided with wheels at the bottom of the implement, thereby making the movement of the hydraulic implement more convenient and flexible, reducing the labor intensity of the operator and improving the work efficiency.
  • N03 00130 The present invention can also meet the control requirements of a variety of hydraulic implements, such as the control of manual hydraulic hinges, forklifts, pallet trailers, etc., so that the above-mentioned implements can be automatically and repeatedly placed in no-load, improving operating efficiency, and the service life of the implements.
  • FIG. 1 is a hydraulic principle diagram of a first embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a hydraulic system according to a first embodiment of the present invention.
  • FIG. 3 is a hydraulic principle diagram of a second embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a hydraulic system according to a second embodiment of the present invention, wherein the hydraulic cylinder shown is a double-acting hydraulic rainbow;
  • FIG. 5 is a partial schematic view in the direction of F in FIG. 2, showing the hinged structure of the stem tube seat and the support in the present invention
  • FIG. 6 is a schematic diagram of a seal ring provided at each gap seal of the valve core and the valve body in the second embodiment of the present invention .
  • the invention proposes a control method for a hydraulic tool that can be repeatedly put in place.
  • the hydraulic control element is used to separately control the high-pressure stage accumulator 4 connected to the hydraulic cylinder 1 with a rod cavity and the low-pressure stage accumulator 3 connected to a rodless cavity.
  • Energy storage enables the hydraulic cylinder to be automatically lifted into position when the hydraulic implement is started without load; when unloaded, the oil in the rodless cavity of the hydraulic cylinder enters the high-pressure accumulator 4 to store energy; the hydraulic implement enters In the normal state, the hydraulic oil in the rodless cavity of the hydraulic cylinder is introduced into the low-pressure accumulator 3, which is used as an energy source for automatic no-load operation in the next operation.
  • the repeatedly in place hydraulic implement control device of the present invention includes a hydraulic cylinder 1, an oil pump 1, a high-pressure stage accumulator 4, a low-pressure stage accumulator 3, and a hydraulic control circuit;
  • the high-pressure stage accumulator 4 is connected to the rod cavity of the hydraulic cylinder 1, and the high-pressure stage accumulator 3 is connected to the rodless cavity of the hydraulic cylinder.
  • the hydraulic control circuit is composed of two positions in this embodiment.
  • the two-way oil return rotary valve ⁇ is connected with a non-return check valve 5 and a hydraulically controlled check valve 6; wherein the first port 7 of the oil return rotary valve 7 respectively opens the rodless cavity of the hydraulic cylinder 2 And the first port P 51 of the double-control check valve 5, and the second port T 7 of the oil return rotary valve 7 are connected to the low-pressure accumulator 3 and the second port P of the hydraulic check valve 6 respectively. 62.
  • the second valve port P 52 of the dual-control check valve 5 is connected to the first valve port P 61 of the hydraulic control check valve 6 and is connected to the high-pressure stage accumulator 4 through the pipeline 40.
  • the third valve port P 53 of the double-control check valve 5 is in communication with the oil pump 1 via the oil supply line 50, and the control port K of the hydraulic control check valve 6 is connected to the pump chamber of the oil pump 1.
  • the spool of the two-position two-way oil return rotary valve 7 is connected with the valve body by a large diameter, and the valve body is closely fitted with the small diameter.
  • a hook groove 72 is provided on the spool of the spool.
  • the center is provided with a through hole, which is provided with a control jack ⁇ : stem 71, the jack 71 has an extended end 711, and the extended end 711 is disposed in the above-mentioned hook groove 72.
  • the rear end of the jack is connected with a power
  • the control mechanism is connected, and its front end is the control end of the first valve port P 51 of the dual-control check valve 5 described above.
  • the power control mechanism has two supports 9 provided on the valve body, a handle tube holder 93 is hinged to the two supports 9 through a pin 94, and a handle 92 is rotatably sleeved on the handle tube.
  • the base 93 is connected to the rear end of the ejector 71 through a universal joint shaft 91.
  • the handle base 93 has a bent and extended power arm 96, which is connected to the oil pump 1.
  • the protruding end 711 of the ejector 71 connected to the handle 92 is driven to slide along the hook groove 72 provided on the oil return rotary valve and spool body, so that the ejector 71 It moves back and forth in the oil return rotary valve ⁇ to control the opening and closing of the first valve port P 51 of the dual-control check valve 5.
  • the oil pump 1 can be driven to supply oil to the above-mentioned hydraulic oil passage.
  • wheels 95 are provided on the bottom of the implement.
  • the hand 4 bar 92 and the ejector rod 71 can also be connected through a flexible shaft 97 (as shown in FIG. 4).
  • the control method and operation process of this embodiment are: In a normal state, the first port P 51 of the dual-control check valve 5 and the second port P 62 of the hydraulic check valve 6 are normally closed, and the oil return rotary valve ⁇ In the normally open state, the valve ports of A 7 and T 7 are conducting, as shown in Figure 1. At this time, the high-pressure stage accumulator 4 releases energy to the rod cavity of the hydraulic cylinder 2, the pressure drop piston 21 is retracted into the hydraulic cylinder 2, and the oil of the rodless cavity of the hydraulic cylinder 1 enters the low-pressure stage through the rotary valve 7 and the pipeline 70. Accumulator 3, oil is stored in accumulators 4, 3 respectively. Among them, the low-pressure accumulator 3 is an accumulator with a fuel tank function.
  • the operating handle 92 rotates in a positive direction, which drives the ejector lever 71 to move forward.
  • the oil return rotary valve 7 is controlled to close first, the oil return rotary valve 7 is in the left position, and the valve ports ⁇ 7 and ⁇ 7 are disconnected. Then, the first valve port P 51 of the check valve 5 is opened by the control of the ejector pin 71. At this time, the double-control check valve 5 is in the neutral position, and the valve ports of P 51 and P 52 are turned on.
  • the pressure oil enters the rodless cavity of the hydraulic cylinder 2 through the pipeline 40 and the one-way valve 5, and the pressure oil in the low-pressure stage accumulator 3 enters the rodless cavity of the hydraulic cylinder 2 through the check valve 31. Then, the accumulator 4, The pressure oil of 3 meets in the rodless cavity of the hydraulic cylinder, and the resultant force lifts up the piston 21.
  • the hydraulic oil in the rod cavity of the hydraulic cylinder 2 is continuously discharged from the pipeline 20 and merges with the pressure oil of the high-pressure stage accumulator 4 to supply oil to the rodless cavity of the hydraulic cylinder, forming a differential circuit. In order to make the piston 21 rise quickly and automatically into position, that is, the piston 21 contacts the load.
  • the handle 92 In the working state, when the piston 21 is lifted into position and enters the working state, the handle 92 is continuously turned to drive the ejector rod 71 to move forward, and the abutment against the dual-control check valve 5 completely closes the second valve port P 52 .
  • the operator's handle 92 swings up and down about the pin 94 to control the pressure oil of the oil pump 1 to pump the oil to the rodless cavity of the hydraulic cylinder 2 through the check valve 11, the pipeline 50, and the double control check valve 5.
  • the oil pump 1 pumps oil, it simultaneously sends high-pressure oil to the control port K of the hydraulic control check valve 6, so that the second valve port P 62 is opened.
  • the handle 92 rotates in the reverse direction, which drives the ejector rod 71 to move backward, and slowly opens the second valve port P 52 of the double control check valve 5.
  • the hydraulic oil in the rodless cavity of the hydraulic cylinder 2 is under load.
  • Make The first wide port P 51 , the second valve port P 52 , and the pipeline 40 passing through the check valve 5 enter the high-pressure accumulator 4 to store energy, and at the same time, can supply oil to the rod cavity of the hydraulic cylinder 2 to Acceleration resets the piston 21.
  • the oil return rotary valve 7 is controlled to disconnect the lifting port B of the rodless cavity of the hydraulic cylinder 1 and the low-pressure accumulator 3, and the ejector 71
  • the non-return check valve 5 is actuated, and the valve port P 51 is opened, so that the above-mentioned high-pressure stage accumulator 4 releases energy, and the pressure oil is conducted to the rodless cavity of the hydraulic cylinder 2 through its differential circuit.
  • the device 3 releases energy, and the pressure oil enters the rodless cavity of the hydraulic cylinder 2 through the pipeline .30, the replenishment check valve 31, and the oil inlet C, so that the above-mentioned hydraulic implement can be automatically and repeatedly lifted into position without load.
  • the control handle 92 keeps the oil return rotary valve 7 and the hydraulic control check valve 6 in the closed position.
  • the pressure of the hydraulic cylinder 2 pressure drops the piston 21, forcing the hydraulic cylinder 2 to
  • the oil in the rod cavity enters the high-pressure stage accumulator 4 for energy storage through a differential circuit formed by a double-control check valve 5.
  • the machine When unloaded, the machine enters the normal state, and is controlled by opening the oil return rotary valve 7 to be in a conducting state.
  • the hydraulic cylinder 2 has a rod-less cavity lifting port B in communication with the low-pressure stage accumulator 3, and the high-pressure stage energy storage.
  • the device 4 releases energy from the rod cavity to the hydraulic cylinder, and continues to drop the pressure of the piston 21 to automatically reset.
  • the hydraulic oil enters the low-pressure stage accumulator 4 through the lifting port B of the rodless cavity of the hydraulic cylinder to achieve the static balance of the hydraulic circuit and recover it.
  • the energy of the load drop is stored in the high- and low-pressure level accumulators respectively, which are used as the energy when the no-load automatic lifting is in place in the next working cycle.
  • the present invention uses high and low pressure accumulators 4, 3, when the high pressure accumulator 4 releases energy from the rod cavity to the hydraulic cylinder 2 and the pressure drop piston 21 is in place, the oil in the rodless cavity of the hydraulic cylinder Entering the low-pressure stage accumulator 3 stores energy, which is used to lift the piston again without load and automatically in place, thereby achieving effective energy conversion and making full use of energy.
  • the above control method and device overcome the problem of oil leakage from the gas tank breathing port in the known technology.
  • the control circuit composed of the oil return rotary valve 7 and the Huan check valve 5 and the hydraulic control check valve 6 has good sealing performance and accurate and reliable operation. . By operating the handle 92, the oil pump 1 and the oil return rotary valve can be controlled together, and the operation is simple and convenient.
  • Fig. 4 is a structural schematic diagram of the hydraulic system of this embodiment, and the hydraulic rainbow is a two-stage double-acting hydraulic cylinder 2,
  • This embodiment includes an oil pump 1, a hydraulic cylinder 2, a piston 21, a high-pressure accumulator 4, a low-pressure accumulator 3, and a hydraulic control circuit.
  • the high-pressure accumulator 4 is connected to the rod-shaped cavity of the hydraulic cylinder 2, and the low-pressure accumulator 3 is connected to the rod-free cavity of the hydraulic cylinder 1.
  • the hydraulic control circuit has a P-type three-position four-way oil return rotary valve 8 whose oil supply port P s is connected to the oil pump 1 through a pipeline 50 with a one-way valve 11 interposed therebetween, and the oil return port T is managed by a pipe
  • the road 70 is connected to the low-pressure accumulator 3 and the oil pump 1 respectively; the first working port A 8 of the oil return rotary valve 8 is connected to the lifting port B of the cylinder 2 without a rod cavity, and the second working port 8 8 passes through the channel.
  • the 40-connected hydraulic cylinder 1 has a rod cavity and a high-pressure stage accumulator 4, and the ⁇ pressure-level accumulator 3 is connected to the oil inlet C of the cylinder 2 without a rod cavity via a fuel check valve 31 and a pipeline 30.
  • Sealing rings 81 are provided at each gap seal between the valve core and the wide body of the P-type three-position four-way oil return rotary valve 8.
  • the return oil to the valve block 8-bit port right condition is normal equipment, the oil supply port P s the second working port B 8 is turned on, the first working port and the return port 8 human T is turned on; the The neutral side of the oil return rotary valve 8!
  • the state of the oil port is P-type, that is, the machine is started and unloaded with no load, the oil return port T is closed, and the oil supply port P 8 , the first working port A 8 , and the second working port B 8 are connected;
  • the condition of the left port oil port of the oil return rotary valve 8 is the working state of the implement. 8 is connected to person 8 and ⁇ is connected to T.
  • the spool of the three-position four-way oil return rotary valve 8 is connected to one end of the flexible shaft 97, and the other end of the flexible shaft 97 is connected to the hand 4 bar 92; of course, the valve core of the oil return rotary valve 8 can also be connected by a universal joint.
  • the shaft 91 is connected to the handle 92 (see FIG. 2).
  • the control process of this embodiment is as follows: When the implement is in a normal state, the oil return rotary valve 8 is in a right position, The first working port person 8 communicates with the return port T. The fuel supply port? 8 communicates with the second working oil port B 8. The piston 21 is automatically reset by the release of the high-pressure accumulator 4. The oil in the lower chamber of the hydraulic cylinder 2 enters the low-pressure accumulator 3 through the channels A 8 and T. No-load energy in place automatically. At the start of no-load operation, the forward rotation is 4 bar 92, and the spool is driven by the flexible shaft 97 (or universal shaft 91).
  • the handle 92 reverse, with the valve body continues to exit, passing through the median port, the port is closed ⁇ , ⁇ 8, ⁇ 8, ⁇ 8 composed of three differential circuit, which voltage drop the load piston 21, forces hydraulic The oil in the rodless cavity of the cylinder 2 enters the high-pressure accumulator 4 to store energy, and finally returns to the normal state.
  • the low-pressure stage accumulator 3 is connected to the rodless cavity of the hydraulic cylinder 2 through a charge check valve 31, and a high-pressure stage accumulator 4 is provided in the rod cavity of the hydraulic cylinder 2 for staged storage.
  • a high-pressure stage accumulator 4 is provided in the rod cavity of the hydraulic cylinder 2 for staged storage.
  • the P-type function three-position four-way valve 8 is directly controlled, it is easy to debug.
  • the middle port of the P-type functional oil return rotary valve 8 is closed for the T port, and the three ports P 8 , ⁇ 8 and ⁇ 8 communicate with each other to form a differential circuit, thereby achieving effective energy conversion, such as no-load process, high
  • the low-pressure stage accumulator simultaneously releases the energy through its differential circuit.
  • the piston is automatically pushed into place.
  • the heavy object pressure drops its piston, forcing its lower cavity oil to enter the high-pressure stage accumulator through its differential circuit to store energy and recover.
  • the energy of the falling weight is prepared as the automatic energy source.
  • a double-stage double-acting hydraulic cylinder 2 is used instead of the ordinary hydraulic cylinder 2, wherein the two-stage hydraulic cylinder V has a two-stage piston. 21, 22, the bottom of the first stage piston 21, is provided with a positioning plate 24, the positioning plate is provided with a plurality of through holes to form a positioning sieve plate; the second stage piston 22 'is sleeved on the first One end of a return spring 23 ′ in the stage piston 21 ′ is fixed to the top of the second stage piston 22 ′, and the other end is fixed to a positioning plate 24 at the bottom of the first stage piston 2 ′.
  • the second-stage piston 22 ' is automatically reset by the elastic force of the tension spring 23, and the first-stage piston 21 is automatically reset by the release of the high-pressure stage accumulator 4.
  • the above-mentioned double-stage double-acting hydraulic cylinder V, and its two-stage pistons 21, 22, are as stable as a pagoda, and the lifting stroke is greatly increased. Since the second-stage piston 22 'is automatically reset by the tension of the tension spring 23, the first-stage piston 21 is lifted first, and the second-stage piston 22' is lifted in the order of no-load in place.
  • the above-mentioned control method and control device can also meet the control requirements of a variety of hydraulic implements, such as the control of manual hydraulic hinges, forklifts, pallet trailers, etc., so that the above-mentioned implements can be automatically and repeatedly in place without load, improving the operation Efficiency, and tool life.
  • hydraulic implements such as the control of manual hydraulic hinges, forklifts, pallet trailers, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne le procédé de commande d'un appareil hydraulique dont le vérin est capable de venir dans une position de travail souhaitée de manière itérative. Cet appareil utilise des éléments de commande qui commandent respectivement un accumulateur de haute pression en communication avec la chambre avec tige de piston d'un vérin hydraulique et un accumulateur de basse pression en communication avec la chambre sans tige de piston de ce vérin hydraulique de façon à accumuler les énergies de différents degrés, de sorte que cet appareil hydraulique puisse soulever automatiquement et de manière itérative ce vérin hydraulique dans une position de travail souhaitée lorsque ce dernier se trouve à l'état déchargé en phase de démarrage. A l'état déchargé, l'huile présente dans la chambre sans tige de piston entre dans cet accumulateur de haute pression. A l'état normal, l'huile présente dans la chambre sans tige de piston est introduite dans l'accumulateur de basse pression de façon à être utilisée comme source d'énergie d'entraînement du vérin dans des positions de travail souhaitées à un état déchargé en vue d'une prochaine opération de travail. Cette invention permet d'éviter l'inconvénient d'une fuite d'huile par la prise d'air du réservoir de la technique antérieure, l'appareil de cette invention possédant une structure de circuit hydraulique simple, une bonne étanchéité et fonctionnant de manière précise et fiable. En outre, grâce à une accumulation d'énergies de différents degrés, à un fonctionnement pratique, à une commande bien ordonnée, à une longue course de travail et grâce à sa capacité de venir à la position de travail souhaitée de manière itérative et automatique, cette invention, non seulement améliore l'efficacité du travail et la durée de vie de l'appareil, mais elle réduit aussi la charge de travail de son utilisateur.
PCT/CN2003/000130 2002-05-31 2003-02-11 Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative WO2003101881A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003211851A AU2003211851A1 (en) 2002-05-31 2003-02-11 The control method and device of a hydraulic apparatus whose cylinder is able to come to a desired work position iteratively

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 02114164 CN1204036C (zh) 2002-05-31 2002-05-31 反复到位液压机具控制装置
CN02114164.9 2002-05-31

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Publication Number Publication Date
WO2003101881A1 true WO2003101881A1 (fr) 2003-12-11

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PCT/CN2003/000130 WO2003101881A1 (fr) 2002-05-31 2003-02-11 Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative

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CN (1) CN1204036C (fr)
AU (1) AU2003211851A1 (fr)
WO (1) WO2003101881A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
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CN102829028A (zh) * 2012-09-25 2012-12-19 莱芜钢铁集团有限公司 液压泵站供油系统及其断油回路
CN114940467A (zh) * 2022-05-24 2022-08-26 华侨大学 电液复合叉车及其驱动系统、方法、装置、存储介质

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JPH112212A (ja) * 1997-06-13 1999-01-06 Tokimec Inc 重量物の昇降駆動装置
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102829028A (zh) * 2012-09-25 2012-12-19 莱芜钢铁集团有限公司 液压泵站供油系统及其断油回路
CN114940467A (zh) * 2022-05-24 2022-08-26 华侨大学 电液复合叉车及其驱动系统、方法、装置、存储介质
CN114940467B (zh) * 2022-05-24 2023-11-03 华侨大学 电液复合叉车及其驱动系统、方法、装置、存储介质

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