EP0290320B1 - Vérin hydraulique avec système de contrôle de la position du piston - Google Patents

Vérin hydraulique avec système de contrôle de la position du piston Download PDF

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Publication number
EP0290320B1
EP0290320B1 EP88401029A EP88401029A EP0290320B1 EP 0290320 B1 EP0290320 B1 EP 0290320B1 EP 88401029 A EP88401029 A EP 88401029A EP 88401029 A EP88401029 A EP 88401029A EP 0290320 B1 EP0290320 B1 EP 0290320B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston
jack
bore
order
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88401029A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0290320A1 (fr
Inventor
Claude Alain Gratzmuller
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.)
Individual
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Individual
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 Individual filed Critical Individual
Priority to AT88401029T priority Critical patent/ATE54726T1/de
Publication of EP0290320A1 publication Critical patent/EP0290320A1/fr
Application granted granted Critical
Publication of EP0290320B1 publication Critical patent/EP0290320B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Definitions

  • the present invention relates to a hydraulic cylinder with a piston position control system.
  • an "image cylinder” is used on the electrical circuit breaker controls, that is to say a small auxiliary control cylinder which is supplied or purged like the main cylinder and which is therefore supposed to reproduce the maneuvers of the main cylinder, and consequently, the movements of the member actuated by the cylinder, that is to say the movable contact of the circuit breaker.
  • this "image jack” Apart from its main role, which consists in indicating the open or closed position of the circuit breaker, this "image jack" also has the function of controlling certain automatic safety operations of the circuit breaker. It must therefore be very safe to operate, which means that its manufacture is delicate and therefore costly, to avoid the risk of a false indication. On the other hand, it has the drawback of requiring an additional hydraulic circuit, which can be a source of hydraulic fluid leaks.
  • the object of the present invention is to remedy the drawbacks and insufficiency of the control systems used until now, such as, in particular, the "image cylinders”.
  • the present invention makes it possible to produce a control system which detects the position of the piston itself during its stroke in the jack, the position detection being able to be made not only at the two end positions, but also in a plurality of intermediate positions.
  • the present invention applies to a differential hydraulic cylinder of this type.
  • the subject of the invention is a cylinder of the aforementioned type characterized: in that a plurality of through holes are drilled in the wall of the cylinder of the cylinder, over the extent of the piston stroke; in that a displacement sensor is arranged in each of said orifices, with its detection member facing the interior of the cylinder so as to be influenced by the passage of the piston; and in that a tight closure is provided between the sensor and the exterior surface of the cylinder to restore the integrity of the tightness of the cylinder at high pressure.
  • Proximity sensors in particular inductive sensors, are preferably used which are influenced by the passage of the metal piston opposite the orifice in which the sensor is housed.
  • the sensors themselves are subjected to the high pressure (300 to 400 bar) prevailing in the cylinder, but there are sensor types designed to work in high pressure environments, for example 500 bar.
  • Inductive sensors have a built-in electrical switch which provides an analog output signal on the output cables which can be amplified and processed before being applied to control instruments which indicate the position of the piston in the cylinder and, by Consequently, the position of the actuated member, in particular the movable contact of a circuit breaker.
  • the jack represented in FIG. 1 is of the type described in the aforementioned patent application and it comprises a cylinder 2 preferably in the form of a casting, a piston 4 devoid of seal, a piston rod 6 which is coupled to the movable contact of a circuit breaker (not shown) and a valve device 8 for closing the intake / bleed orifice 10 of the jack in the low end position (position shown on the right half of the figure) of the piston 4.
  • the actuator also comprises an end-of-stroke damping system in which the closing valve is constituted by a floating ring 8 which has two sealing lips 12-12 'and whose central bore 14 cooperates with a damping stud 16 carried by the piston 6.
  • the closing valve is constituted by a floating ring 8 which has two sealing lips 12-12 'and whose central bore 14 cooperates with a damping stud 16 carried by the piston 6.
  • the annular chamber 18 of the actuator (above the piston 6) is permanently connected to the high pressure source constituted by an oleopneumatic accumulator 20.
  • the chamber main 22 of the jack (below the piston 6) is selectively connected, by a 3-way valve 24, or to high pressure (by the pipe 26 and by a transfer pipe 28, which preferably came from the foundry with the cylinder 2 of the jack), that is to purge to a low pressure tank 30.
  • a plurality of through holes 34 are drilled in the wall 32 of the cylinder 2 at several levels on the stroke of the piston.
  • FIG. 1 only three orifices have been represented, one at each end of the piston stroke and an intermediate, but, of course, if we want a greater number of detection points for the passage position of the piston it is possible to pierce more than three orifices, on the same generator of the cylinder or, preferably on different generators.
  • a proximity sensor 36 is housed, the detection face 38 (see FIG. 2) flush with the interior surface 40 of the cylinder 2.
  • Sealing means such as seals 42-42 'ensure the closure tight of the orifices 34 at the high pressure prevailing in the cylinder of the jack, after the installation of the sensors 36 in their housing.
  • FIG. 1 shows only two of the orifices 34 fitted with their sensor 36, the mounting of a sensor in its housing being shown in more detail in the sectional view of FIG. 2.
  • each sensor is via a two-wire cable 44, all these cables arriving at means 46 for controlling and / or recording and / or displaying the movements of the piston 6 and, optionally, the speed curves .
  • inductive sensors with microswitch designed to operate in a high-pressure environment, such as those sold by the company HONEYWELL CONTROL SYSTEMS LTD under the reference series 921, 922, 926 which can operate under a pressure of 500 bar.
  • sensors could be used, for example capacitive or, again, mechanical.
  • the detection system according to the invention has the advantage that it is directly integrated into the jack itself and that it does not require any mounting or connection on site other than the connection of the sensor output cables to the control.
  • the detection system by means of its control equipment 46, indicates the open or closed position of the circuit breaker, ensures safety interlocks with the other devices associated with the circuit breaker (for example disconnectors) , and prohibits the "pumping" phenomena of the circuit breaker in the event of tripping on engagement (closing on short circuit) if the closing order is maintained.
  • the system according to the invention makes it possible to carry out various measurements which were not possible with an image jack, as we have seen in the foregoing, or even with mechanical connections or linkages taken directly on the movable member actuated by the jack. In fact, because of the length and the play in these mechanical connections, the measurements were completely imprecise, if only as a result of the elastic forces and deformations appearing in these mechanical connections during the operations of the circuit breakers which are very brutal.

Landscapes

  • 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)
  • Actuator (AREA)
  • Servomotors (AREA)
  • Vehicle Body Suspensions (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Valve Device For Special Equipments (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Body Structure For Vehicles (AREA)
  • Gear Transmission (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)
EP88401029A 1987-05-06 1988-04-27 Vérin hydraulique avec système de contrôle de la position du piston Expired - Lifetime EP0290320B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401029T ATE54726T1 (de) 1987-05-06 1988-04-27 Hydraulischer zylinder mit kolbenpositionsregelsystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706368 1987-05-06
FR8706368A FR2614946B1 (fr) 1987-05-06 1987-05-06 Verin hydraulique avec systeme de controle de position du piston

Publications (2)

Publication Number Publication Date
EP0290320A1 EP0290320A1 (fr) 1988-11-09
EP0290320B1 true EP0290320B1 (fr) 1990-07-18

Family

ID=9350823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401029A Expired - Lifetime EP0290320B1 (fr) 1987-05-06 1988-04-27 Vérin hydraulique avec système de contrôle de la position du piston

Country Status (19)

Country Link
US (1) US5031504A (uk)
EP (1) EP0290320B1 (uk)
JP (1) JPS63295399A (uk)
KR (1) KR920004529B1 (uk)
CN (1) CN1009853B (uk)
AT (1) ATE54726T1 (uk)
AU (1) AU598362B2 (uk)
BR (1) BR8802199A (uk)
CA (1) CA1287342C (uk)
CZ (1) CZ280407B6 (uk)
DE (1) DE3860323D1 (uk)
ES (1) ES2016123B3 (uk)
FI (1) FI87104C (uk)
FR (1) FR2614946B1 (uk)
HU (1) HU209777B (uk)
SU (1) SU1722242A3 (uk)
UA (1) UA5569A1 (uk)
YU (1) YU47284B (uk)
ZA (1) ZA882921B (uk)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405716A (zh) * 2014-11-04 2015-03-11 哈尔滨工业大学 两端预紧式压电堆致缸体多模态振动的低摩擦特性气缸

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5704813A (en) * 1995-12-13 1998-01-06 Namco Controls Corporation Proximity sensor housing and arrangement
DE19824940A1 (de) * 1998-06-04 1999-12-09 Mannesmann Sachs Ag Betätigungseinrichtung für Kraftfahrzeuge mit integrierter Positionserkennung
US6941827B2 (en) * 2003-12-19 2005-09-13 Caterpillar Inc. Mounting apparatus and method for cylinder position sensor
DE102006028785B3 (de) * 2006-06-23 2007-04-12 Audi Ag Anordnung von Positionsgebern an einer Schaltstange
DE102008035971B3 (de) * 2008-08-01 2009-09-24 Stabilus Gmbh Verstellelement
CN105366583B (zh) * 2015-12-15 2019-03-22 常州信息职业技术学院 基于无线通信的智能千斤顶装置
CN105621305B (zh) * 2016-03-03 2018-09-28 郑州四维矿业机械有限责任公司 一种活塞及使用该活塞的千斤顶
JP6437037B2 (ja) * 2017-03-30 2018-12-12 本田技研工業株式会社 アクチュエータ及びそれを備えた流体圧制御回路

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR954080A (fr) * 1941-07-23 1949-12-19 Const Mecaniques De La Vallee Cylindre hydraulique à fonctionnement libre
US3717073A (en) * 1971-06-23 1973-02-20 Caterpillar Tractor Co Proximity switch magnet control for bucket positioner
FR2317532A1 (fr) * 1975-07-07 1977-02-04 Gratzmuller Jean Louis Verin hydraulique a amortisseur incorpore avec realimentation de la chambre d'amortissement
US4316145A (en) * 1976-10-01 1982-02-16 Electro-Mechanical Products Fluid pressure actuator with proximity position sensor
US4385297A (en) * 1980-01-14 1983-05-24 Schmitt Wilhelm E Arrangement for sensing proximity of a reciprocating member
DE3241237C2 (de) * 1982-11-09 1985-10-24 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Schubkolbengetriebe, insbesondere zur Verwendung als Rückzylinder in Bergbau-Gewinnungsbetrieben, mit an der Kolbenstange angeordnetem Dauermagnetsystem
DE3314111A1 (de) * 1983-04-19 1984-10-25 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Einrichtung zur wegabhaengigen positionsangabe hydraulisch betaetigter schaltstangen
DE3437150A1 (de) * 1984-10-10 1986-04-10 Robert Bosch Gmbh, 7000 Stuttgart Ventil
DE3525029C2 (de) * 1984-12-22 1995-08-31 Festo Kg Kolben-Zylinder-Anordnung
US4681992A (en) * 1986-03-06 1987-07-21 C. M. Smillie & Company Cushioned clamp cylinder with proximity switches
US4756229A (en) * 1986-09-25 1988-07-12 United Technologies Corporation Digital motor feedback for a position actuator
US4755636A (en) * 1987-06-24 1988-07-05 Taiyo, Ltd. Piston position detecting device for fluid pressure cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405716A (zh) * 2014-11-04 2015-03-11 哈尔滨工业大学 两端预紧式压电堆致缸体多模态振动的低摩擦特性气缸

Also Published As

Publication number Publication date
JPH0543640B2 (uk) 1993-07-02
HU209777B (en) 1994-10-28
FR2614946B1 (fr) 1989-06-23
BR8802199A (pt) 1988-12-06
HUT52604A (en) 1990-07-28
CN1009853B (zh) 1990-10-03
FI87104B (fi) 1992-08-14
CZ280407B6 (cs) 1996-01-17
FI882038A (fi) 1988-11-07
US5031504A (en) 1991-07-16
ZA882921B (uk) 1988-10-27
UA5569A1 (uk) 1994-12-28
EP0290320A1 (fr) 1988-11-09
KR880013812A (ko) 1988-12-21
CS303388A3 (en) 1992-04-15
CA1287342C (en) 1991-08-06
AU1502788A (en) 1988-11-10
YU47284B (sh) 1995-01-31
SU1722242A3 (ru) 1992-03-23
AU598362B2 (en) 1990-06-21
YU88288A (en) 1990-12-31
ES2016123B3 (es) 1990-10-16
FI882038A0 (fi) 1988-05-02
JPS63295399A (ja) 1988-12-01
KR920004529B1 (ko) 1992-06-08
DE3860323D1 (de) 1990-08-23
ATE54726T1 (de) 1990-08-15
FR2614946A1 (fr) 1988-11-10
FI87104C (fi) 1992-11-25
CN88102582A (zh) 1988-11-23

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