US3489063A - Electrical control device for a hydraulic circuit - Google Patents

Electrical control device for a hydraulic circuit Download PDF

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Publication number
US3489063A
US3489063A US685545A US3489063DA US3489063A US 3489063 A US3489063 A US 3489063A US 685545 A US685545 A US 685545A US 3489063D A US3489063D A US 3489063DA US 3489063 A US3489063 A US 3489063A
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United States
Prior art keywords
distributor
switch
contacts
electromagnet
piston
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Expired - Lifetime
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US685545A
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English (en)
Inventor
Jean Piret
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Simca Automobiles SA
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Simca Automobiles SA
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    • 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
    • F15B21/08—Servomotor systems incorporating electrically operated control means

Definitions

  • a device for controlling a hydraulic circuit which comprises a source of pressurized fluid, a pressure regulator controlling the maximum pressure of the source of pressurized fluid, a cylinder having a double-acting reciproeating piston, a distributor selectively connecting the source of pressurized fluid to the cylinder and a return conduit, a pair of electromagnets mounted at each end of the distributor, control circuit means for the electromagnets including a pair of end of travel switches and a change of direction switch, the end of travel switches and the change of direction switch being controlled by the piston, a second pair of switches each of which has at least two sets of contacts, the second pair of switches being operated by the movement of the corresponding electromagnet by the intermediary of a mechanical transmission cooperating with the distributor, one of each of the two sets of contacts of the second pair of switches is placed in the supply circuit of each of the electromagnets so that only one of the electromagnets can be energized at a time.
  • the present invention relates to an electric control device for hydraulically controlling a double-acting piston, and particularly to devices of this type in which the hydraulic piston is actuated by a fluid which controls a machine-tool.
  • the simplest hydraulic circuits usually associated with double-acting cylinders having two chambers are in general constituted by a source of hydraulic fluid under pres sure such as a pump which draws fluid from a reservoir, a pressure regulator in the delivery line of the pump and a distributor mounted in the delivery line downstream of the pressure regulator and upstream of the cylinder.
  • This distributor being adjustable into three positions so as to establish the following connections: in a first end position of the distributor, the left chamber of the cylinder is connected with the delivery conduit of the pump and the right chamber of the cylinder is connected with a reservoir return conduit; in a second or intermediate position of the distributor, the two chambers of the cylinder are connected with the delivery conduit and the reservoir return conduit; and in the other end position, the right chamber of the cylinder is connected with the pump delivery conduit and the left chamber is connected with the reservoir return conduit.
  • An electric control for this type of a hydraulic circuit normally comprises: two electromagnets one of which is connected to each side of the distributor. These electromagnets act on the distributor in a direction opposite to each other so as to urge the distributor from the intermediate position into one of its end positions.
  • the electric control also includes an electrical circuit for controlling these electromagnets and includes two end of travel switches and one travel reversing switch. The three switches are controlled by a cam carried by the rod of the piston mounted in the cylinder.
  • the electric circuit further includes two relay connected to the electromagnets by a delay switch utilized to delay the excitation of the second electromagnet until after the de-excitation of the first electromagnet.
  • the known electrical devices are normally placed in a protective housing provided beside the machine-tool and always require connecting electric cables or wires for the different electrical elements contained in the housing.
  • the electromagnets In this type of an installation the electromagnets must be provided with cables which can handle the excitation current thereof, which is much higher than the intensity of the circuit current utilized by the relays and the switches.
  • the relays are usually fairly expensive which adds considerably to the cost of the installation. Also, since the excitation and de-excitation of the electromagnets is not only a function of the position of the piston in the cylinder by means of the cam and the switches at the finish of a stroke, but also of the delay switch, the operation of the device is not exact.
  • the present invention eliminates all of these inconveniences by providing an electrical control means for a hydraulic circuit of the type mentioned above which does away with all relays and the requirements for a separate protective housing and which controls the feeding of the electromagnets as a function of the position of the distributor.
  • FIG. 1 is a schematic representation of a hydraulic operating circuit for a piston and an electrical control device for this hydraulic circuit
  • FIG. 2 is a schematic representation of an electrical control device in accordance with this invention.
  • FIG. 1 there is shown a cylinder 1, for use with a machine tool sealingly carrying a piston 2 therein.
  • a piston rod 3 is integrally formed at one end with the piston 2 and carries at its free end a earn 4.
  • Two chambers 5 and 6 are formed on either side of the piston 2 in the cylinder 1.
  • a principal distributor 9 is connected to chamber 5 by a conduit 7 and to chamber 6 by a conduit 8.
  • This distributor 9 is constituted by a slide valve which is movable into three positions 9a, 9b and 9c as schematically shown in FIG. 1. In these three positions the chambers 5 and 6 of the cylinder are selectively connected to a hydraulic delivery circuit 10 of a pump P and/or a return conduit 11 which feeds fluid into a pump reservoir 12.
  • the distributor 9 connects the hydraulic delivery line 10 with the chambers 5 and 6 and the chambers 5 and 6 with the return conduit 11.
  • the conduits 10 and 11, and the chambers 5 and 6 all communicate with each other and there is practically no pressure in all of the elements.
  • the distributor 9 connects the hydraulic delivery conduit 10 with the chamber 5 and the return conduit 11 with the chamber 6.
  • the distributor 9 connects the delivery conduit 10 with the chamber 6 and the return conduit 11 with the chamber 5.
  • a pressure regulator 13 is mounted in parallel with the delivery conduit 10 and permits the maximum pressure in this conduit to be accurately governed.
  • Transmission rods 16 and 17 are attached to each end of the distributor 9 and cooperate with movable armatures 18 and 19, respectively, of a corresponding electromagnet A or B.
  • the free ends of the armatures 18 and 19 are provided with push rods 20 and 21, respectively.
  • the push rod 20 cooperates with one end of a hinged arm 22 which is capable of acting on a switch having two sets of contacts B and B: through the other end of the arm.
  • the push rod 21 cooperates with a hinged arm 23 to operate the contacts A A in the same manner.
  • the double throw switch A A is operated by the movement of the armature 18 of the electromagnet A by means of a unidirectional mechanical transmission which comprises the slide valve of the distributor 9, the rod 17, the movable armature 19 of the electromagnet B, the push rod 21 and the hinged lever 23.
  • the movable armature 18 acts an the unidirectional mechanical transmission, only when the electromagnet A is energized.
  • the operation of the switch containing the contacts B B is effected in an analogous manner by the movable armature 19 of the electromagnet B by means of the slide valve in the distributor 9, the rod 16, push rod 20 and hinged lever 22.
  • Each of a pair of switches containing the two sets of contacts A A and B B are subjected to the action of springs 24 and 25, respectively, which springs are disposed in association with the respective levers 23 and 22, in such a manner that in the intermediate position 9b of the distributor 9, the contacts A and B are closed and the contacts A and B are open.
  • Each of the pair of switches is housed within a fluid tight housing 27, 28, respectively, mounted on the distributor 9.
  • the cam 4 cooperates with two end of travel switches F and P and a change of direction switch F These switches are disposed in such a manner that in the starting position of the piston 2, the cam 4 cooperates with the switch F and in the end position of the piston shown to the right in FIG. 1, this cam cooperates with the switches F and Peg.
  • the electrical control device is supplied from a source of alternating current (not shown) via lines and 31, and comprises two electrical units U and U each of which is, respectively, provided with an operating coil, for the electromagnets A and B.
  • the different switches represented in FIG. 2 are of two types. All of the switches which are found on the left hand side of an electric line taken in the direction of the arrow F are closed and the switches indicated as being to the right of this line are opened when they are not activated by their corresponding control elements.
  • the first electric unit U comprises the end of travel switch F connected in series with a parallel assembly containing the set of contacts A a manual starting switch Ma, and an automatic cycling switch Ca. Once operated the automatic cycling switch Ca remains in the position in which it has been placed.
  • the parallel assembly is in turn connected in series with the contact B which is connected in series with the coil of the electromagnet A.
  • the second electric unit U includes a parallel assembly constituted by the change of direction switch F and the end of travel switch F connected in series with the set of contacts B
  • the parallel assembly of unit 2 is connected in series with the set of contacts A which is in turn connected in series with the coil of the electromagnet B.
  • the operation of the device is as follows: as shown in FIGS. 1 and 2, the device rests in its normal or rest position with the electromagnets A and B being in an unexcited position.
  • the piston 2 is in its extreme left position, the end of travel switch F is open, the end of travel switch P is closed, the change of direction switch P is open, the distributor 9 is in the intermediate position, the contacts A and B are closed and the contacts A and B are open.
  • the starting switch Ma is closed thereby causing the excitation of the electromagnet A.
  • the movable armature 18 moves from left to right thereby moving the distributor 9 into its end position 9a.
  • this movement is transmitted, by the intermediary of the rod 16 of the distributor 9 to the rod 17 and thus to the movable armature 19 of the electromagnet B, thereby moving the push rod 21 causing the lever 23 to turn on its fulcrum first opening the contacts A and, then, closing the contacts A
  • the further excitation of the elcctromagnet is now assured by the closed contacts F A and B and the manual switch Ma may be released.
  • the springs 14 and 15 bias the slide valve of the distributor into the intermediate position 9b in which the contacts A are closed therefore allowing the coil of the electromagnet B to be excited through the intermediary of the switch Fcg.
  • the excitation of the electromagnet B causes the displacement of the movable armature 19 of distributor 9 and of the movable armature 18 of electromagnet A. This movement causes the lever 22 to first open the contacts B, and then close the contacts B when the slide valve of the distributor 9 has been moved to the position 9c. In this position, the chamber 5 is connected to the return conduit 11 and the chamber 6 is connected to the delivery conduit 10.
  • This invention is particularly adapted to be used with switch control systems which are operated by a distributor or the movable armature of an electromagnet associated with the distributor. But, the invention also may be applied to control systems which require the operation of a pneumatic distributor having a slide valve, check valves or a rotary valve and for all other modes of distribution.
  • the number of sets of contacts operating the electromagnets do not have to be limited to two, but, if considered desired, four or more sets of contacts may be used to assure the automatic operation of a more complex cycle.
  • a device for the electric control of a hydraulic circuit comprising: a source of pressurized fluid; a delivery conduit for said pressurized fluid; a distributor in said delivery conduit having a body and two ends; a cylinder having a double acting piston connected to said distributor; electrical control means for said device including: an electromagnet mounted at each end of said distributor and a control circuit for said electromagnets; said control circuit having two end of travel switches and a change of travel switch; said switches being controlled by said piston; a second pair of switches each of which contains two sets of contacts; each of said second pair of switches capable of being operated by a corresponding electromagnet through the intermediary of the distributor; one of the two sets of contacts of one of said second pair of switches being placed in a supply circuit of one of the electromagnets and the other set of contacts being placed in a supply circuit of the other electromagnet.
  • a device for controlling a hydraulic circuit as recited in claim 1 including a starting switch and a recycling switch in parallel, said switches being in the supply circuit of one of said electromagnets.
  • each of said second pair of switches is housed within a fluid tight housing mounted on said distributor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Magnetically Actuated Valves (AREA)
US685545A 1966-11-25 1967-11-24 Electrical control device for a hydraulic circuit Expired - Lifetime US3489063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR85058A FR1508374A (fr) 1966-11-25 1966-11-25 Dispositif de commande électrique d'un circuit hydraulique

Publications (1)

Publication Number Publication Date
US3489063A true US3489063A (en) 1970-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US685545A Expired - Lifetime US3489063A (en) 1966-11-25 1967-11-24 Electrical control device for a hydraulic circuit

Country Status (8)

Country Link
US (1) US3489063A (de)
BE (1) BE706580A (de)
CH (1) CH483568A (de)
DE (1) DE1588801A1 (de)
ES (1) ES347197A1 (de)
FR (1) FR1508374A (de)
GB (1) GB1212214A (de)
SE (1) SE334543B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3613509A (en) * 1968-11-06 1971-10-19 Bosch Gmbh Robert Electrohydraulic remote control arrangement for hydraulic directional valves
US3668786A (en) * 1968-05-10 1972-06-13 Vante De Materiels Pour La Fab Facility for heating a product in strip
US3976401A (en) * 1975-01-02 1976-08-24 Mountain Donald C Pump for abrasive slurries and the like
US4066004A (en) * 1976-07-06 1978-01-03 J. I. Case Company Oscillatory electro-hydraulic system
US4099450A (en) * 1975-06-27 1978-07-11 Kondo Manufacturing Co., Ltd. Feed mechanism
US4106291A (en) * 1977-03-31 1978-08-15 Lambert Brake Corporation Core machine having hydrostatic drive
US4754691A (en) * 1984-09-27 1988-07-05 British Nuclear Fuels Plc Fluid operated devices for moving articles
US4818191A (en) * 1982-03-31 1989-04-04 Neyra Industries, Inc. Double-acting diaphragm pump system
US4924671A (en) * 1986-11-25 1990-05-15 Mannesmann Rexroth Gmbh Controlled series high-pressure intensifiers for hydraulic press cylinded circuit
DE3900718A1 (de) * 1989-01-12 1990-07-26 Depa Ges Fuer Verfahrenstechni Verfahren und vorrichtung zur steuerung einer druckluftbetriebenen doppelmembranpumpe
US5253575A (en) * 1991-08-03 1993-10-19 Mercedes-Benz Ag Cover driving system
US5325762A (en) * 1992-10-29 1994-07-05 Nordson Corporation Fluid pressure operated piston engine assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530645A (en) * 1979-09-21 1985-07-23 Hydraunit Venture Oil well pumping apparatus
US4432706A (en) * 1980-05-09 1984-02-21 Gilbertson Thomas A Oil well pump driving unit
EP0051665A1 (de) * 1980-05-09 1982-05-19 GILBERTSON, Thomas A. Antriebseinheit für ölbohrlochpumpe
FI81178C (fi) * 1982-01-06 1990-09-10 Kemira Oy Anordning foer dosering eller reglerad pumpning av vaetska eller slam.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735405A (en) * 1953-04-21 1956-02-21 hipple
US2736296A (en) * 1952-12-26 1956-02-28 Charles Leitschuh Hydraulic step drilling unit
US2991760A (en) * 1956-12-28 1961-07-11 Jules A Rhine Tool feed and control
US3060466A (en) * 1958-01-30 1962-10-30 Acme Ind Company Controls for turret lathes and the like
US3225541A (en) * 1964-02-05 1965-12-28 Simca Automobiles Sa Hydraulic anti-shock device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736296A (en) * 1952-12-26 1956-02-28 Charles Leitschuh Hydraulic step drilling unit
US2735405A (en) * 1953-04-21 1956-02-21 hipple
US2991760A (en) * 1956-12-28 1961-07-11 Jules A Rhine Tool feed and control
US3060466A (en) * 1958-01-30 1962-10-30 Acme Ind Company Controls for turret lathes and the like
US3225541A (en) * 1964-02-05 1965-12-28 Simca Automobiles Sa Hydraulic anti-shock device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668786A (en) * 1968-05-10 1972-06-13 Vante De Materiels Pour La Fab Facility for heating a product in strip
US3613509A (en) * 1968-11-06 1971-10-19 Bosch Gmbh Robert Electrohydraulic remote control arrangement for hydraulic directional valves
US3976401A (en) * 1975-01-02 1976-08-24 Mountain Donald C Pump for abrasive slurries and the like
US4099450A (en) * 1975-06-27 1978-07-11 Kondo Manufacturing Co., Ltd. Feed mechanism
US4066004A (en) * 1976-07-06 1978-01-03 J. I. Case Company Oscillatory electro-hydraulic system
US4106291A (en) * 1977-03-31 1978-08-15 Lambert Brake Corporation Core machine having hydrostatic drive
US4818191A (en) * 1982-03-31 1989-04-04 Neyra Industries, Inc. Double-acting diaphragm pump system
US4754691A (en) * 1984-09-27 1988-07-05 British Nuclear Fuels Plc Fluid operated devices for moving articles
US4924671A (en) * 1986-11-25 1990-05-15 Mannesmann Rexroth Gmbh Controlled series high-pressure intensifiers for hydraulic press cylinded circuit
DE3900718A1 (de) * 1989-01-12 1990-07-26 Depa Ges Fuer Verfahrenstechni Verfahren und vorrichtung zur steuerung einer druckluftbetriebenen doppelmembranpumpe
US5174731A (en) * 1989-01-12 1992-12-29 DEPA Gesellschaft fur Verfahrenstecnik mit beschrankter Haftung Method and arrangement for controlling a compressed air-operated double diaphragm pump
US5253575A (en) * 1991-08-03 1993-10-19 Mercedes-Benz Ag Cover driving system
US5325762A (en) * 1992-10-29 1994-07-05 Nordson Corporation Fluid pressure operated piston engine assembly

Also Published As

Publication number Publication date
CH483568A (fr) 1969-12-31
GB1212214A (en) 1970-11-11
BE706580A (de) 1968-04-01
DE1588801A1 (de) 1970-04-30
FR1508374A (fr) 1968-01-05
ES347197A1 (es) 1969-01-16
SE334543B (de) 1971-04-26

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