EP0147256B1 - Alimentation d'un verin en fluide hydraulique en continu et par impulsion controlée - Google Patents

Alimentation d'un verin en fluide hydraulique en continu et par impulsion controlée Download PDF

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Publication number
EP0147256B1
EP0147256B1 EP84402194A EP84402194A EP0147256B1 EP 0147256 B1 EP0147256 B1 EP 0147256B1 EP 84402194 A EP84402194 A EP 84402194A EP 84402194 A EP84402194 A EP 84402194A EP 0147256 B1 EP0147256 B1 EP 0147256B1
Authority
EP
European Patent Office
Prior art keywords
pipe
pressure
accumulator
hydraulic
jack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84402194A
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German (de)
English (en)
French (fr)
Other versions
EP0147256A1 (fr
Inventor
Jean-Pierre Augoyard
Philippe Guggemos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GTM Entrepose SA
Original Assignee
GTM Entrepose SA
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 GTM Entrepose SA filed Critical GTM Entrepose SA
Priority to AT84402194T priority Critical patent/ATE31786T1/de
Publication of EP0147256A1 publication Critical patent/EP0147256A1/fr
Application granted granted Critical
Publication of EP0147256B1 publication Critical patent/EP0147256B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F15B21/12—Fluid oscillators or pulse generators
    • 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

Definitions

  • the present invention relates to a method for supplying hydraulic fluid, continuously and by controlled impulse, with accumulation of hydraulic energy, a hydraulic cylinder normally working continuously, and it also relates to a device for implementing this method.
  • Hydraulic cylinders working continuously and their hydraulic fluid supply system are well known. They are usually used to move a load or tool in a continuous movement over a distance which can be relatively large. Whether working on push or pull, a cylinder pressure chamber is supplied with pressurized hydraulic fluid to move the piston of the cylinder over part or all of its stroke in a continuous movement at a speed which depends on the supply pressure and the resistant force encountered by the piston rod of the jack. The return of the piston rod to its starting position is ensured either by means of a spring (single-acting cylinder), or by supplying pressurized fluid to the other chamber of the hydraulic cylinder (double-acting cylinder).
  • the amplitude and the frequency can be adjusted to adapt them to the nature of the materials to be extracted (according to this previous document, a high frequency is advantageous with fine-grained materials, while a lower frequency is preferable with coarse-grained materials) .
  • this known system behaves like a continuously oscillating system, the oscillations of which are systematic, whether or not the shovel 1 encounters an increase in resistance during its movement.
  • the control device 10 is simply intended to replace the operator when the latter can no longer obtain a sufficiently high desired frequency of oscillation by actuating only the hand lever back and forth. 8.
  • it facilitates the penetration of the shovel into the material to be extracted, such a principle of operation is nevertheless unfavorable insofar as the mechanical parts are subject to rapid wear due to their reciprocating or oscillating movement. high frequency.
  • the present invention aims to solve this problem.
  • the method of the present invention is characterized in that it consists in supplying a pressure chamber of the hydraulic cylinder with hydraulic fluid and, simultaneously, in storing hydraulic energy in an accumulator from from a source of pressurized fluid, as long as the pressure in the pressure chamber of the cylinder remains below a selected value, so that the cylinder normally works continuously, to isolate the pressure chamber of the hydraulic cylinder from the source of pressurized fluid when the pressure in the pressure chamber of the jack reaches said chosen value, at connect the pressure chamber of the jack to a hydraulic fluid reservoir to drop the pressure in said pressure chamber, then isolate the pressure chamber of the jack from the reservoir, then put the accumulator in communication only with the chamber pressure of the jack to send a pulse of hydraulic fluid thereto, and then isolating the pressure chamber of the jack from the accumulator and re-establishing the connection between the source of pressurized fluid, on the one hand, and the pressure chamber and the accumulator, on the other hand, and to maintain them in this being as long as the pressure in the
  • the supply device for implementing this method comprises, in a known manner, a pump, a fluid reservoir, a first pipe having a first end and a second end which can be connected to a pressure chamber of a jack. hydraulic, a main distributor connected to the pump, to the reservoir and the first end of the first piping to put the latter in selective communication with the pump or with the reservoir, and a hydraulic energy accumulator.
  • the supply device is characterized in that it further comprises a first piloted valve which is connected to the first pipe and to the tank and which, in a rest position, isolates the first pipe from the tank and, in a position of work, establishes communication between the first piping and the tank, a second piloted valve which is inserted in the first piping between the second end thereof and the first piloted valve and which, in a rest position, allows the passage of the fluid in the first pipe and, in a working position, cuts the said passage, a second pipe having a first and a second end connected to the first pipe respectively between the main distributor and the second piloted valve and between the latter and the second end of the first piping, said accumulator being connected to the second piping, valve means inserted in the second piping ie and comprising a third piloted valve which, in a rest position, prevents the passage of the fluid in the second piping from accumulator towards the second end of the second piping and, in a working position, authorizes the passage of fluid from
  • the feeding device shown in fig. 1 comprises in known manner, a pump 1, a reservoir 2 of hydraulic fluid, a main distributor 3 and two pipes 4 and 5 connected respectively to the two pressure chambers 6 and 7 of the cylinder of a double-acting cylinder 8 (only one two pipes 4 and 5 would be provided in the case of a single-acting cylinder).
  • the main distributor 3 is shown in a neutral position, in which the fluid sucked by the pump 1 in the tank 2 is returned again to the tank.
  • the main distributor 3 When the main distributor 3 is placed in one or other of its two working positions, the fluid sucked by the pump 1 is discharged through the piping 4 to the chamber 6 or through the piping 5 to the chamber 7 , depending on the working position of the main distributor, that of the two chambers 6 and 7 which is not supplied with pressurized fluid being connected through the piping 4 or 5 to the tank.
  • the supply device of the present invention further comprises a hydraulic block 9 which, in the case envisaged above, is inserted in the piping 4 between the main distributor 3 and the chamber 6 of the jack 8.
  • the hydraulic block 9 comprises a first pilo valve tee 10, which is inserted into the pipe 4 and which, in its rest position shown in FIG. 1, lets the hydraulic fluid pass through the piping 4 and, in its working position, establishes a communication between the piping 4 and the tank 2.
  • the hydraulic block 9 comprises a second piloted valve 11 which is also inserted in the piping 4 , between the piloted valve 10 and the chamber 6 of the jack 8, and which, in its rest position shown in FIG. 1, authorizes the passage of the fluid in the pipe 4 and, in its working position, cuts said passage.
  • the hydraulic unit 9 further comprises a pipe 12, one end of which is connected to the pipe 4 between the main distributor 3 and the second piloted valve 11, for example between the main distributor 3 and the first piloted valve 10 as shown in fig. 1, and the other end of which is connected to the pipe 4 between the second piloted valve 11 and the chamber 6 of the jack 8.
  • a pipe 12 In the pipe 12 are inserted in series, from the first end to the second end of the pipe 12, a unidirectional valve 13, an accumulator 14 and a third piloted valve 15.
  • the unidirectional valve 13 is connected so as to allow the passage of the hydraulic fluid only from the main distributor 3 towards the accumulator 14. In its rest position shown on the fig.
  • the piloted valve 15 cuts the passage of the fluid in the piping 12, while in its working position, it allows the passage of the fluid from the accumulator 14 to the chamber 6 of the jack 8.
  • an adjustable nozzle 16 can be inserted into the piping 12 downstream of the piloted valve 15 to adjust the flow rate of the hydraulic fluid towards the chamber 6 of the jack 8 when the piloted valve 15 is in its working position.
  • the piloted valves 10, 11 and 15 can be actuated by a sequential control unit 17, which will now be described with reference to FIG. 4.
  • the three piloted valves 10, 11 and 15 are electro-valves that can be actuated by the excitation coils or solenoids Sa, Sb and Sc, respectively.
  • the number 18 designates a current supply source, for example a 12 V or 24 V battery
  • the number 19 designates a circuit breaker which, when it is energized, connects two supply conductors 20 and 21 respectively across the current source 18.
  • the sequential control unit 17 comprises a first relay Re having a normally open contact R, a second and a third relay, M l and M 2 both having a contact, respectively M lT and M 2T , normally open and delayed on closing, and a fourth relay M 3 having a contact M 3T normally closed and delayed on opening.
  • the duration of the delay of the third relay M 2 is slightly longer than that of the second relay M, as will be seen below.
  • a first end of the excitation coils Re, M i , M 2 , M 3 , Sa, Sb and Sc is connected to the supply conductor 20.
  • the other end of the excitation coils Re, M i , M 2 , Sa and Sb, the latter through the normally open contact M 1T , is connected to the supply conductor 21, on the one hand, through one or the other of two normally open contacts BP and PR connected in parallel and , on the other hand, through the normally open contact R and the normally closed contact M 3T connected in series.
  • the other end of the excitation coils M 3 and Sc is connected to the junction point 22 between the normally open contact R and the normally closed contact M 3T through the normally open contact M 2T .
  • the BP contact remains a push button contact. It allows manual control of the start of an operating sequence of the solenoid valves 10, 11 and 15, provided that the pressure in the chamber 6 of the jack 8 and in the accumulator 14 has reached a sufficient value, which can be checked by means of one or other of the two manometers 23 and 24 connected to the pipes 4 and 12, respectively (fig. 1).
  • the PR contact is the contact of a pressure switch 25, which makes it possible to automatically control the start of an operating sequence of the solenoid valves 10, 11 and 15 each time the pressure in the chamber 6 of the jack 8 and in the accumulator 14 reaches the triggering threshold of the pressure switch 25.
  • the triggering threshold of the pressure switch 25 can for example be adjusted to the maximum pressure that can be supplied by the pump 1, or to a value slightly lower than the maximum pressure.
  • the pressure switch 25 is hydraulically connected to the pipe 4 between the main distributor 3 and the solenoid valve 11.
  • the triggering threshold of the pressure switch 25 is adjusted to a pressure of 300 bars, and that the accumulator 14 is a membrane accumulator, inflated with nitrogen at a pressure 100 bars (of course, other types of accumulator can be used, for example accumulators in which the active element, membrane or piston, is prestressed by a calibrated spring). Under these conditions, when the solenoid valves 10, 11 and 15 are in their rest position shown in FIG.
  • the normally open contact PR closes, which is represented by the high state in FIG. 5 (in this figure, the closed state of the contacts and the energized state of the coils is represented by the high state, while the open state of the contacts and the de-energized state of the coils is represented by the low state) .
  • the closing of the contact PR causes the excitation of the relay Re which closes its contact R, and also the excitation of the relays M 1 and M 2 and of the coil Sa of the solenoid valve 10.
  • the relay M 3 and the coils Sb and Sc of the solenoid valves 11 and 15 are not energized since the contacts M 1T and M 2T of the relays M 1 and M 2 are delayed upon closing.
  • the contact M 2T closes, which has the effect of exciting the relay M 3 and the coil Sc of the solenoid valve 15.
  • the latter is then switched to its working position and, consequently, the accumulator 14 is connected to the chamber 6 of the jack 8 and sends a pulse of hydraulic fluid to the latter.
  • the length of the piping 12 and of the piping 4 between the accumulator 14 and the jack 8 is as short as possible so that the hydraulic fluid pulse is transmitted to the chamber 6 in the shortest possible time.
  • the contact M 3T opens, which has the effect of de-energizing all the relays Re, M i , M 2 and M 3 , and the coils Sa, Sb, Sc of the solenoid valves 10, 11 and 15. As a result, the sequential control unit 17 is reset.
  • each operating sequence of the solenoid valves 10, 11 and 15 is automatically started by the pressure switch 25.
  • the push button BP by pressing one or more times on the BP push button, the operator can manually start one or more sequences of operation of the solenoid valves when he notices that a strong resistance is opposed to the displacement of the piston rod 27 or when he finds that the pressure read on either of the pressure gauges 23 and 24 to exceed the pressure of inflation of the nitrogen in the accumulator 14 (100 bars in the example considered here).
  • curve A in solid lines represents the variation over time of the pressure of the hydraulic fluid in the accumulator 14, while curve B in dashed lines represents the variation over time of the pressure in the chamber 6 of the jack 8 during a typical example of operation.
  • curve B in dashed lines represents the variation over time of the pressure in the chamber 6 of the jack 8 during a typical example of operation.
  • the lower horizontal line H l represents the pressure of inflation of the nitrogen in the accumulator 14
  • the upper horizontal line H 2 represents the maximum pressure that can be supplied by the pump 1 and also the triggering threshold of the pressure switch 25, and the area between the two lines H 1 and H 2 represents the working range of the accumulator 14.
  • valves 30 and 31 are provided for selectively placing the accumulator 14 or the accumulator 29 in communication with the piping 12, while the valves 32 and 33 are provided to put the unused accumulator 14 or 29 in communication with the tank 2.
  • the time delays of the relays M i , M 2 and M 3 can be adjusted for example by means of adjustment buttons 34, 35 and 36, respectively, accessible on one face of the casing of the sequential control unit 17 (fig. 1).
  • the piloted valve 10 is inserted in the piping 4.
  • the piloted valve 10 can be inserted in a piping 37 connected in bypass to the piping 4 as shown in FIG. 2. In this case, the operation would be exactly the same as that described above.
  • the present invention finds application in many fields of technology. Examples include metalworking (presses for spinning, drawing, stamping, stamping) and soil and rock working (hydraulic shovels working in backhoe or loader, civil or agricultural engineering tractor working in ripping , etc.) and, in general, in all cases where a hydraulic cylinder normally working continuously must be able to provide a momentary dynamic force, at any point of its stroke, to overcome an increase in resistance during movement of its piston rod.
  • FIG. 7 a hydraulic shovel 42 comprising, in a known manner, an arrow 43, which is pivotally mounted at its rear end on the chassis and which can be actuated by a jack 45, a pendulum 46, which is pivotally mounted at its rear end on the 'front end of the boom 43 and which can be actuated by a jack 47, and a bucket 48, provided with knockout teeth 49, which is pivotally mounted in retro at the front end of the pendulum 46 and which can be actuated by a jack such as the jack 8 of FIG. 1, by means of a lifter 50 and a link 51.
  • a hydraulic shovel 42 comprising, in a known manner, an arrow 43, which is pivotally mounted at its rear end on the chassis and which can be actuated by a jack 45, a pendulum 46, which is pivotally mounted at its rear end on the 'front end of the boom 43 and which can be actuated by a jack 47, and a bucket 48, provided with knockout teeth
  • the jack 8 is carried by the pendulum 46 on which are also arranged the hydraulic block 9 and the accumulator 14 of FIG. 1.
  • the front part of the hydraulic shovel 42 of FIG. 7 with a pendulum 46 fitted with a bucket '48 mounted as a loader.
  • the unidirectional valve 13 (fig. 1) can be replaced by a piloted valve identical to the piloted valve 11 and which, in a rest position, authorizes the passage of the hydraulic fluid through the piping 12 to the accumulator 14 or 29 and, in a working position, cuts said passage.
  • the sequential control unit 17 must actuate the piloted valve 13 at the same time as the piloted valve 10.
  • the sequential control unit 17 can be produced in the form of electronic circuits with transistors or integrated circuits.
  • the sequential control unit 17 may itself be constituted by switches and delay circuits operating with compressed air or with a hydraulic fluid under pressure.
  • the jack 8 works mainly in the thrust. If it works mainly in traction, it is enough to connect the piping 5 to the chamber 6 and the piping 4 to the chamber 7.
  • jack 8 works as well in the thrust as in the traction and if hydraulic impulses must being able to be sent both to chamber 6 and to chamber 7, it suffices to insert into the piping 5 a second hydraulic block identical to the hydraulic block 9 of FIG. 1 or, more simply, to have a reversing valve in the pipes 4 and 5 between the hydraulic block 9 and the jack 8.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Actuator (AREA)
  • Press Drives And Press Lines (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Reciprocating Pumps (AREA)
  • Refuse Collection And Transfer (AREA)
EP84402194A 1983-11-02 1984-10-31 Alimentation d'un verin en fluide hydraulique en continu et par impulsion controlée Expired EP0147256B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402194T ATE31786T1 (de) 1983-11-02 1984-10-31 Kontinuierliche und kontrolliert pulsierende zufuehrung von druckfluessigkeit zu einem hydraulikzylinder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8317382A FR2554179B1 (fr) 1983-11-02 1983-11-02 Procede pour alimenter en fluide hydraulique, en continu et par impulsion controlee, un verin hydraulique travaillant normalement en continu, et dispositif pour la mise en oeuvre du procede
FR8317382 1983-11-02

Publications (2)

Publication Number Publication Date
EP0147256A1 EP0147256A1 (fr) 1985-07-03
EP0147256B1 true EP0147256B1 (fr) 1988-01-07

Family

ID=9293700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402194A Expired EP0147256B1 (fr) 1983-11-02 1984-10-31 Alimentation d'un verin en fluide hydraulique en continu et par impulsion controlée

Country Status (8)

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US (1) US4590763A (enExample)
EP (1) EP0147256B1 (enExample)
JP (1) JPS60172706A (enExample)
AT (1) ATE31786T1 (enExample)
CA (1) CA1246497A (enExample)
DE (1) DE3468491D1 (enExample)
ES (1) ES537627A0 (enExample)
FR (1) FR2554179B1 (enExample)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328426A1 (de) * 1983-08-06 1985-02-21 Achim 8070 Ingolstadt Graul Arbeitswerkzeug fuer erdbwegungsgeraete
JPS62119490U (enExample) * 1986-01-23 1987-07-29
US5116188A (en) * 1987-09-16 1992-05-26 Kabushiki Kaisha Kobe Seiko Sho Vibration suppressing device for wheeled construction equipment
DE3841369A1 (de) * 1988-12-08 1990-06-21 Kloeckner Humboldt Deutz Ag Pulshydraulik
JPH04140503A (ja) * 1990-10-02 1992-05-14 Teisaku:Kk 油圧シリンダのための脈動装置
JP2964607B2 (ja) * 1990-10-11 1999-10-18 日産自動車株式会社 油圧供給装置
AU2418992A (en) * 1991-08-07 1993-03-02 Microhydraulics, Inc Active suspension system
ATE150508T1 (de) * 1991-09-04 1997-04-15 Orenstein & Koppel Ag Hydraulisches schwingungsdämpfungssystem für mit arbeitsgeräten versehene arbeitsmaschinen
US5878569A (en) * 1996-10-21 1999-03-09 Caterpillar Inc. Energy conversion system
WO2000060177A2 (en) * 1999-04-06 2000-10-12 Downer Edwin E Jr Energy conservation system for earth-moving loading machines
US6655136B2 (en) 2001-12-21 2003-12-02 Caterpillar Inc System and method for accumulating hydraulic fluid
US6763661B2 (en) * 2002-05-07 2004-07-20 Husco International, Inc. Apparatus and method for providing vibration to an appendage of a work vehicle
US20140283915A1 (en) * 2013-03-21 2014-09-25 Caterpillar Inc. Hydraulic Control System Having Relief Flow Capture
GB2563238B (en) * 2017-06-07 2021-04-28 Caterpillar Sarl Fluid delivery system
US11493060B2 (en) 2019-06-04 2022-11-08 Industries Mailhot Inc. Hydraulic powering system and method of operating a hydraulic powering system
CN113090596B (zh) * 2021-03-15 2022-09-16 中国科学院工程热物理研究所 一种具有热冗余备份供油的油动机系统及其控制方法
CN115370626B (zh) * 2022-08-16 2025-06-06 中煤科工集团重庆研究院有限公司 液压马达低速步进式旋转控制方法
CN115405578B (zh) * 2022-08-16 2025-06-06 中煤科工集团重庆研究院有限公司 一种液压马达微角度步进控制方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886121C (de) * 1951-05-07 1953-08-10 Fredenhagen Kommanditgesellsch Aufnahmeschaufel fuer Foerdergut fuer intermittierenden Betrieb
NL261563A (enExample) * 1960-03-01
FR2243357A1 (en) * 1974-04-18 1975-04-04 Poclain Sa Control device for body with reciprocating motion - electro-magnet and time relay control double acting ram distributor
JPS519865A (ja) * 1974-07-15 1976-01-26 Matsushita Electric Works Ltd Choonpaparusuekooshikisuitsuchino godosaboshikairo
US4188787A (en) * 1978-06-05 1980-02-19 National Advanced Drilling Machines, Inc. Hydraulic control apparatus
FR2439079A1 (fr) * 1978-10-16 1980-05-16 Manceau Marcel Unite autonome de gavage hydraulique par accumulateur d'une installation de commande par pompe d'une presse a injecter

Also Published As

Publication number Publication date
CA1246497A (fr) 1988-12-13
FR2554179B1 (fr) 1986-01-03
JPH0381011B2 (enExample) 1991-12-26
ES8603218A1 (es) 1986-01-01
EP0147256A1 (fr) 1985-07-03
ES537627A0 (es) 1986-01-01
FR2554179A1 (fr) 1985-05-03
DE3468491D1 (en) 1988-02-11
ATE31786T1 (de) 1988-01-15
JPS60172706A (ja) 1985-09-06
US4590763A (en) 1986-05-27

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