GB944631A - Improvements in fluid-operated actuators - Google Patents

Improvements in fluid-operated actuators

Info

Publication number
GB944631A
GB944631A GB3874361A GB3874361A GB944631A GB 944631 A GB944631 A GB 944631A GB 3874361 A GB3874361 A GB 3874361A GB 3874361 A GB3874361 A GB 3874361A GB 944631 A GB944631 A GB 944631A
Authority
GB
United Kingdom
Prior art keywords
ram
valve
pressure
cylinder
passage
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
GB3874361A
Inventor
Bert Roy Holdham
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.)
NORTH HANTS ENGINEERING CO Ltd
Original Assignee
NORTH HANTS ENGINEERING CO Ltd
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 NORTH HANTS ENGINEERING CO Ltd filed Critical NORTH HANTS ENGINEERING CO Ltd
Priority to GB3874361A priority Critical patent/GB944631A/en
Publication of GB944631A publication Critical patent/GB944631A/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

944,631. Fluid pressure apparatus. NORTH HANTS ENGINEERING CO. Ltd. Oct. 30, 1962 [Oct. 30, 1961], No. 38743/61. Heading FIP. An actuator comprises two rams 11, 14, Fig. 1, of different area movable in a common hydraulic cylinder 11, a double-acting pneumatic piston and cylinder the piston 4 of which is connected to operate the smaller of the rams in the hydraulic cylinder, a hydraulic reservoir 18, and a passage 22 between the reservoir and hydraulic cylinder controlled by a valve 24 which, during each return stroke of the actuator, is opened by means 28 responsive to air pressure in that end of the pneumatic cylinder to which compressed air is admitted for the return stroke. The smaller ram 11 is connected to the rod 10 of the pneumatic piston 4 and extends through the larger ram 14 with a clearance 34 through which fluid can flow. The reservoir 18 is connected to the lower end of the hydraulic cylinder by a passage 20 and to the upper end by the passage 22 which is normally closed by the spring-pressed valve 24. When compressed air is supplied through a passage 6 to the upper end of the pneumatic cylinder, the piston 4 moves the ram 11 downwardly to pressurise hydraulic fluid in the upper part of the hydraulic cylinder so that the larger ram 14 moves downwardly at a low speed. The rams are returned to their upper positions by compressed air supplied to the lower end of the pneumatic cylinder through a passage 8, the pressure in the cylinder acting on a piston 28 to open the valve 24 to enable the hydraulic fluid above the ram 14 to pass to the reservoir as the ram is raised by a flange 36 on the smaller ram 11. In an alternative embodiment in which the movement of the larger ram is effected in two stages, a seal 52, Fig. 2, is provided between the concentric surfaces of the rams 11 and 14, and two passages 54, 57 connect the interior of the larger ram 14 with the hydraulic cylinder. The passage 54 is controlled by a spring-loaded valve 56, and the passage 57 is controlled by a relatively heavily spring-loaded valve 58. During the first part of the forward stroke of the actuator, the pressure within the larger ram is above atmospheric pressure and the downward movement of the larger ram draws fluid from the reservoir through the valve 24. When the larger ram encounters resistance, the pressure within the ram opens' the valve 58 to enable pressure to act in the cylinder 11 on the whole area of the larger ram, the pressure also closing the valve 24. On the first part of the return stroke, the valve 24 is opened by the pressure in the lower part of the pneumatic cylinder and the valve 56 opens so that, during upward movement of the smaller ram, the larger ram remaining stationary, fluid can flow into the larger ram. The return stroke is completed by the flange 36 engaging the valve 58 to raise the large ram, hydraulic fluid passing to the reservoir through the valve 24. The upward movement of the piston 4 is damped by a boss 42 and throttle 46.
GB3874361A 1961-10-30 1961-10-30 Improvements in fluid-operated actuators Expired GB944631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3874361A GB944631A (en) 1961-10-30 1961-10-30 Improvements in fluid-operated actuators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3874361A GB944631A (en) 1961-10-30 1961-10-30 Improvements in fluid-operated actuators

Publications (1)

Publication Number Publication Date
GB944631A true GB944631A (en) 1963-12-18

Family

ID=10405423

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3874361A Expired GB944631A (en) 1961-10-30 1961-10-30 Improvements in fluid-operated actuators

Country Status (1)

Country Link
GB (1) GB944631A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2810894A1 (en) * 1977-03-24 1978-10-05 Schenker Storen Maschf PNEUMATIC HYDRAULIC CYLINDER
DE3145401A1 (en) * 1981-11-16 1983-05-26 Unima Maschinenbau Gmbh, 6603 Sulzbach Pressure-intensified power-cylinder unit
DE3445824A1 (en) * 1984-12-15 1986-06-19 Bayerische Motoren Werke AG, 8000 München Self-adjusting actuating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2810894A1 (en) * 1977-03-24 1978-10-05 Schenker Storen Maschf PNEUMATIC HYDRAULIC CYLINDER
DE3145401A1 (en) * 1981-11-16 1983-05-26 Unima Maschinenbau Gmbh, 6603 Sulzbach Pressure-intensified power-cylinder unit
DE3445824A1 (en) * 1984-12-15 1986-06-19 Bayerische Motoren Werke AG, 8000 München Self-adjusting actuating device

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