GB754959A - Control system for hydraulic apparatus - Google Patents

Control system for hydraulic apparatus

Info

Publication number
GB754959A
GB754959A GB10708/54A GB1070854A GB754959A GB 754959 A GB754959 A GB 754959A GB 10708/54 A GB10708/54 A GB 10708/54A GB 1070854 A GB1070854 A GB 1070854A GB 754959 A GB754959 A GB 754959A
Authority
GB
United Kingdom
Prior art keywords
relay
ram
coil
spool
energizes
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
GB10708/54A
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.)
Denison Engineering Co
Original Assignee
Denison Engineering Co
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 Denison Engineering Co filed Critical Denison Engineering Co
Publication of GB754959A publication Critical patent/GB754959A/en
Expired legal-status Critical Current

Links

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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/166—Electrical control arrangements
    • 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

Landscapes

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

Abstract

754,959. Electric selective control systems. DENISON ENGINEERING CO. April 12, 1954 [April 21, 1953] No 10708/54. Class 40(1) [Also in Group XXIX] A reversible fluid pressure motor is controlled by a directional control valve, the spool of which is displaced proportionally to the current flow in the actuating solenoid therefore, this current flow being regulated by marginally operated relays the supply to which is controlled by variable resistors adjusted by the motor The invention is described as applied to a hydraulic press in which the normally retracted ram 25 is advanced rapidly for the first portion of its stroke and then at a reduced rate, andis automatically retracted from a predetermined position. To initiate an operating cycle of the press a start switch 68 is momentarily closed to energize the start-relay 46 which in turn operates a relay 47. Relay 47 locks and energizes the operating coil 38 over an adjustable resistor 87 to move the spool 30 of the control valve 20 to the right. Fluid pressure is thereby admitted to the top of the cylinder 23 to advance the ram 25 at a rapid rate. The ram, as it moves adjusts through a mechanical linkage 60, potentiometers 53, 54, 55 to vary the current flow in relays 50, 51, 52 which are preset by potentiometers 61-63 so as to operate sequentially as the ram is advanced (downwardly) to predetermined positions. The operation of relay 50 has no effect during forward movement of the ram but when relay 51 operates, relay 47 falls off and the energization of coil 38 is now effected over contacts 97, 88 and a resistor 92, adjusted so as to reduce the current flow in coil 38 and hence to reduce the rate of ram advance. When the ram advance energizes relay 52, a relay 48 is energized. This de-energizes the coil 38 and energizes coil 40 over a resistor 102 to move the spool 30 to the left whereby the ram advance is stopped and its retraction started. The retraction speed is set by the resistor 102 and retraction continues until the relay 50 is de-energized by the ram movement to release relay 48 when the spool centralizes under spring bias to stop the ram. By closing a switch 74 the start relay 46 locks when operated and causes continuous cycling of the system until a stop switch 70 is opened.
GB10708/54A 1953-04-21 1954-04-12 Control system for hydraulic apparatus Expired GB754959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US330256XA 1953-04-21 1953-04-21

Publications (1)

Publication Number Publication Date
GB754959A true GB754959A (en) 1956-08-15

Family

ID=21868153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10708/54A Expired GB754959A (en) 1953-04-21 1954-04-12 Control system for hydraulic apparatus

Country Status (6)

Country Link
US (1) US2735405A (en)
BE (1) BE528133A (en)
CH (1) CH330256A (en)
FR (1) FR1103463A (en)
GB (1) GB754959A (en)
NL (1) NL93847C (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2948193A (en) * 1953-09-08 1960-08-09 Ibm Alternating pulse servo system
US2846980A (en) * 1954-03-01 1958-08-12 Ckd Ceska Lipa Narodni Podnik Device for slowing down the movement of the press piston in hydraulic presses
US2956550A (en) * 1957-04-02 1960-10-18 American Brake Shoe Co Hydraulic control apparatus
US2951342A (en) * 1957-11-14 1960-09-06 Monarch Machine Tool Co Electro-hydraulic servo system
US3031903A (en) * 1958-05-12 1962-05-01 Schloemann Ag Control of hydraulic forging presses
US3138976A (en) * 1958-12-27 1964-06-30 Schloemann Ag Hydraulic forging presses
US3158345A (en) * 1961-09-19 1964-11-24 American Brake Shoe Co Railway switch actuating mechanism
US3296868A (en) * 1963-07-22 1967-01-10 Bailey Meter Co Differential pressure transmitter
US3289515A (en) * 1963-10-12 1966-12-06 Chiesa Artorige Machine for shearing or punching of sheer materials
DE1918990U (en) * 1964-05-14 1965-07-01 Industriaktiebolaget Skomab CONTROL DEVICE FOR DOUBLE-ACTING PNEUTMATIC OR HYDRAULIC CYLINDERS.
US3365624A (en) * 1966-08-10 1968-01-23 Automatic Valve Corp Valve control system
FR1508374A (en) * 1966-11-25 1968-01-05 Simca Automobiles Sa Electrical control device of a hydraulic circuit
US3695023A (en) * 1969-11-07 1972-10-03 Toyoda Automatic Loom Works Control apparatus for fluid actuator
US4004116A (en) * 1975-04-09 1977-01-18 Fenco Corporation Pneumatic cylinder for controlling electrical switch operation
US4275793A (en) * 1977-02-14 1981-06-30 Ingersoll-Rand Company Automatic control system for rock drills
US4899097A (en) * 1986-10-02 1990-02-06 Chapman Leonard T Motorized tang drive system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188834A (en) * 1937-04-29 1940-01-30 Siemens App Und Maschinen Gmbh Control apparatus for vehicles
US2262173A (en) * 1938-05-17 1941-11-11 Siemens App Und Maschinen Gmbh Automatic regulating apparatus
US2388369A (en) * 1944-10-30 1945-11-06 Shendrick Constantine Fluid control valve
GB636328A (en) * 1947-01-15 1950-04-26 Arthur Philip Glenny Improvements in or relating to automatic pilots for aircraft
US2644427A (en) * 1948-07-16 1953-07-07 Sperry Corp Servo system
US2629365A (en) * 1949-03-11 1953-02-24 Union Carbide & Carbon Corp Electropneumatic control system

Also Published As

Publication number Publication date
FR1103463A (en) 1955-11-03
US2735405A (en) 1956-02-21
NL93847C (en)
CH330256A (en) 1958-05-31
BE528133A (en)

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