US3776101A - Control device for controlling a pneumatic piston - Google Patents

Control device for controlling a pneumatic piston Download PDF

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Publication number
US3776101A
US3776101A US00271215A US3776101DA US3776101A US 3776101 A US3776101 A US 3776101A US 00271215 A US00271215 A US 00271215A US 3776101D A US3776101D A US 3776101DA US 3776101 A US3776101 A US 3776101A
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US
United States
Prior art keywords
bore
port
differential piston
larger diameter
piston
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
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US00271215A
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English (en)
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T Nussbaumer
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Individual
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Individual
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Publication of US3776101A publication Critical patent/US3776101A/en
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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86622—Motor-operated
    • Y10T137/8663—Fluid motor

Definitions

  • a control device for controlling a pneumatic piston and cylinder type actuator in conjunction with a 2- position 3-port valve comprises a differential piston mounted in a stepped cylinder bore for sliding movement into one or the other of two end positions according to whether compressed air is admitted under the control of the valve to the smaller diameter end of the bore or to both the smaller and larger diameter ends of the bore.
  • Two ports opening respectively to I the smaller and larger parts of the bore are controlled by the differential piston and each acts as a combined flow-and return passage for pressure fluid for one end of the motor cylinder.
  • A.by-pass passage having both ends opening to the larger diameter portion of the bore permits air exhausting from the motor into this portion of the bore, during part of the travel of the differential piston, to by-pass the larger diameter part of the piston and to exhaust to atmosphere via an exhaust port which is in permanently open communication with a part of the bore between the larger'and smaller diameter ends of the piston.
  • This invention relates to control devices for actuators operated by pressure fluid, and particularly for pneu matic actuators.
  • a control device for a pressure fluid operated actuator which device comprises a casing providing a cylinder bore, and a differential piston which is mounted in the bore for reciprocating movement between two end positions and which has a larger diameter end portion and a smaller diameter end portion.
  • the said cylinder bore has a -smaller diameter portion and a larger diameter portion in which the smaller and larger diameter end portions of the differential piston are respectively slidably disposed for reciprocating movement and which are closed at their ends remote from each other.
  • a chamber is formed within the bore between the larger and smaller diameter end portions of the differential piston, and the casing provides first and second ports which open tothe ends of the smaller and larger diameter end portions of the bore respectively.
  • a by-pass passage has opposite ends thereof opening to the larger diameter portion of the bore for enabling fluid to by-pass the larger diameter end portion of the differential piston to flow into the chamber over a part of the travel of the differential piston between the end positions.
  • a third port opens to the smaller diameter portion of the bore, which third port communicates with the first port when the differential piston is in one of the two end positions, and communicates with the chamber when the differential piston is in the other of the two end positions.
  • a fourth port opens to the larger diameter portion of the bore which fourth port communicates with the chamber when said differential piston is in the one of its end positions and communicates with the second port when the differential piston is in the other of its end positions, and a fifth port places the chamber in permanently open communication with the ambient atmosphere.
  • FIG. 1 is a longitudinal section through a control device according to the invention in combination with a 3-port, 2-way valve and a pneumatic actuator, the valve and actuator being shown diagrammatically,
  • FIG. 2 is a section on line II II of FIG. 1, and
  • FIGS. 3 and 4 correspond to FIGS. 1 and 2, respectively, show the movable parts in another working position.
  • a passage 6 opens to the section 2c at the outerend of the bore, and this passage has a union socket for apipe 7 leading to the 3-port two-way valve 8 which is so connected that the pipe 7 can be connected either with an exhaust orifice 9 or with a pipe 10 leading to thecompressedair source, depending upon the position of the valve.
  • Further transverse bores open to the bore 2 of the casing as follows:
  • a bore 11 opens to the narrowest portion 2a and is connected by the shortest possible length of connecting pipe 12 to one end of the workingcylinder 13a of a pneumatic actuator 13 and a bore 14 opens to section 2c of the bore 2 and is connected by the shortest possible length of connecting pipe 15 to the other end of the working cylinder 13a in which a piston 13b is displaceable by the compressed air.
  • a differential piston 16 Contained in the three-stage bore 2 of the casing l is a differential piston 16, Le. a piston with ends of unequal cross-section, and the piston has an intermediate diameter of which may be 15 mm for example, is indicated at 16a.
  • Two sealing rings 17 and 18 are disposed in grooves in the cylindrical face of this portion 16a of the piston, and a sealing ring 19 is disposed in a groove in the cylindrical face of section 16c.
  • the end closure member 3 has a sealing ring 20, whilst a Seger ring or circlip 22 fitted in a groove 21 holds the end closure member 3 in position.
  • a transverse bore 23 Opening to section 2b of the bore 2 is a transverse bore 23 which communicates with the atmosphere by way of a noise-inhibiting filter 24.
  • a by-pass which is constituted by two transverse bores 25 and 26 which extend from a circular recess 27, closed by a cover-disc 28,- to section 2c of the bore 2, and by an intermediate chamber 29 between the cover-disc 28 and the inner end of the recess 27.
  • FIGS. 1 and 2 the various movable parts are shown in the initial position:
  • the piston 13b of the pneumatic actuator 13 is in its topmost position in the cylinder 13a.
  • the casing of the control element 1 Secured directly to this cylinder 13a is the casing of the control element 1 which is connected on the one handy to the compressed-air source through the pipe 5, and on the other to the valve 8 by way of the pipe 7, and this pipe may be relatively long and does not need to be of particularly great cross-section.
  • the differential piston 16 of the control device is in the topmost position since the lowest section 2a of the bore 2 is connected to the compressed-air pipe 5, whereas the third section 2c of this bore communiates with the atmosphere by way of the pipe 7.
  • valve 8 is now actuated so that the pipe 7 and the space above the differential piston 16 in the bore 20 are immediately filled with compressed air.
  • piston 16 remains under the pressure of the compressed air in the pressure reservoir until the valve 8 is released to enable it to return to the position illustrated in FIG. 1.
  • the pipe 7 communicates with the atmosphere through the valve 8 so that the pressure in the pipe 7 and thus the force acting downwardly on the piston 16 become smaller.
  • the piston is moved slowly upwards until the portion 16c having the greatest diameter uncovers the bore 26 again.
  • the air in the space above this portion of the piston 16 can now escape to the atmosphere through the transverse bore 25, the chamber 29, the transverse bore 26, the annular chamber surrounding the intermediate portion 16b and through the bore 23 and the noise-inhibiting filter 24, so that the piston 16 rapidly returns to the position illustrated in FIGS.
  • the 5-port 2-way valves are designed as solenoid valves and are fitted directly alongside the drive unit, and there is, so to speak, a completely free choice in the location of the control device
  • this carries the not inconsiderable disadvantage that electrical lines are required in addition to the pneumatic ones, so that the assistance of an electrician is necessary in installation, modification and repair operations, and in many instances additional difficulties arise on account of the safetymeasures prescribed, for example, for premises that are damp or where a risk of explosion exists. Therefore, if electrified systems are not used, relatively slowv operation of the pneumatic actuator often has to be accepted.
  • the arrangement described above however provides rapid operation and does not suffer these disadvantages.
  • control device should be fitted as closely as possible to the reversible actuator, but the 3-port 2-way valve, connected to it through only one pipe, can be disposed at a relatively great distance away without the occurrence of any delay caused by the escape of air to the atmosphere, since the air is discharged directly into the atmosphere from the control element.
  • a control device for a pressure fluid operated actuator which device comprises a casing providing a cylinder bore, and a differential piston which is mounted in the bore for reciprocating movement between two end positions and which has a larger diameter end portion and a smaller diameter end portion, said cylinder bore having a smaller diameter portion and a larger diameter portion in which the smaller and larger diameter end portions of the differential piston are respectively slidably disposed for said reciprocating movement and which are closed at their ends remote from each other, a chamber being formed within the bore between said larger and smaller diameter end portions of the differential piston, and said casing provid ing first and second ports which open to said ends of the smaller and larger diameter end portions of the bore, respectively, a by-pass passage having opposite ends thereof opening to the larger diameter portion of the bore for enabling fluid to by-pass the larger diameter end portion of said differential piston to flow into the chamber over a part of the travel of said differential piston between said end positions, a third port opening to the smaller diameter portion of the bore which third port communicates with said first port when said differential piston is in one of
  • a pressure-fluid operated actuator comprising a cylinder and a piston slidably mounted in the cylinder, said cylinder having pipe connections at opposite ends thereof, a device for controlling said actuator, which device comprises a casing providing a cylinder bore, and a differential piston which is mounted in the bore for reciprocating movement between two end positions and which has a larger diameter end portion and a smaller diameter end portion, said cylinder bore having a smaller diameter portion and a larger diameter portion in which the smaller and larger diameter end portions of the differential piston are respectively slidably disposed for said reciprocating movement and which are closed at their ends remote from each other, a chamber being formed within the bore between said larger and smaller diameter end portions of the differential piston, and said casing providing first and second ports which open to said ends of the smaller and larger diameter end portions of the bore, respectively, a by-pass passage having opposite I ends thereof opening to the larger diameter portion of the bore for enabling fluid to by-pass the larger diameter end portion of said differential piston to flow into the chamber over a part of the travel of
  • a changeover valve a control device controlled by the valve, and a pressure-fluidoperated actuator which is controlled by the control device and which comprises a cylinder and a piston slidably mounted in the cylinder, said cylinder having pipe connections at opposite ends thereof;
  • the valve providing a passage communicating with the control device, and an exhaust connection and a supply connection to a source of pressure fluid which connections can selectively be placed in communication with said passage by operation of the valve;
  • said control device comprising a casing providing a cylinder bore, and a differential piston which is mounted in the bore for reciprocating movement between two end positions and which has a larger diameter end portion and a smaller diameter end portion, said cylinder bore having a smaller diameter portion and a larger diameter portion in which the smaller and larger diameter end portions of the differential piston are respectively slidably disposed for said reciprocating movement and which are closed at their ends remote from each other, a chamber being formed within the bore between said larger and smaller diameter end portions of the differential piston, and said casing providing first and second ports which open to said
  • a control device for a pressure fluid operated actuator as claimed in claim .1, in which said chamber is defined by the inner surface of said casing and by a reduced diameter portion of said piston located between said larger and smaller diameter end portions of said piston.
  • a control device for a pressure fluid operated actuator including means connecting said first port continuously to a source of fluid under pressure, and means selectively operable to connect said second port to said source or to atmosphere.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Fluid-Driven Valves (AREA)
  • Multiple-Way Valves (AREA)
US00271215A 1971-07-23 1972-07-13 Control device for controlling a pneumatic piston Expired - Lifetime US3776101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1086371A CH541081A (de) 1971-07-23 1971-07-23 Einrichtung zum Umschalten eines hin- und hergehenden Antriebskolbens in einem pneumatischen Antriebsaggregat

Publications (1)

Publication Number Publication Date
US3776101A true US3776101A (en) 1973-12-04

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ID=4367618

Family Applications (1)

Application Number Title Priority Date Filing Date
US00271215A Expired - Lifetime US3776101A (en) 1971-07-23 1972-07-13 Control device for controlling a pneumatic piston

Country Status (7)

Country Link
US (1) US3776101A (fr)
BE (1) BE786534A (fr)
CH (1) CH541081A (fr)
DE (1) DE2223951A1 (fr)
FR (1) FR2143015B1 (fr)
GB (1) GB1338882A (fr)
IT (1) IT959088B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023466A (en) * 1973-08-08 1977-05-17 Gkn Windsor Gmbh Apparatus for regulating the speed of and the pressure of fluid upon the ram in the injection assembly of an injection molding machine
US4036106A (en) * 1975-04-03 1977-07-19 Southwestern Manufacturing Co. Actuator control system
US4114376A (en) * 1975-10-10 1978-09-19 Fiat Societa Per Azioni Servo-assisted hydraulic braking system
US4627467A (en) * 1982-07-28 1986-12-09 Pneumo Corporation Pilot operated directional control valve
CN101096036B (zh) * 2006-06-27 2012-09-05 Sms米尔股份有限公司 用于使板材变形的内轮廓工具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808477C2 (de) * 1978-02-28 1992-10-22 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Druckausgeglichenes Ventil für HFA-Flüssigkeiten
DE3345720A1 (de) * 1983-01-13 1984-08-02 Beringer-Hydraulik GmbH, Neuheim, Zug Umschaltsitzventil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US663727A (en) * 1897-12-27 1900-12-11 James Christie Hydraulic valve.
US2401258A (en) * 1942-07-21 1946-05-28 Cons Vultee Aircraft Corp Hydraulic actuating mechanism
US2943604A (en) * 1956-05-17 1960-07-05 Sylvania Electric Prod Motor velocity control valve
US3142315A (en) * 1961-07-31 1964-07-28 W E Hennells Co Inc Four-way pilot valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US663727A (en) * 1897-12-27 1900-12-11 James Christie Hydraulic valve.
US2401258A (en) * 1942-07-21 1946-05-28 Cons Vultee Aircraft Corp Hydraulic actuating mechanism
US2943604A (en) * 1956-05-17 1960-07-05 Sylvania Electric Prod Motor velocity control valve
US3142315A (en) * 1961-07-31 1964-07-28 W E Hennells Co Inc Four-way pilot valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023466A (en) * 1973-08-08 1977-05-17 Gkn Windsor Gmbh Apparatus for regulating the speed of and the pressure of fluid upon the ram in the injection assembly of an injection molding machine
US4036106A (en) * 1975-04-03 1977-07-19 Southwestern Manufacturing Co. Actuator control system
US4114376A (en) * 1975-10-10 1978-09-19 Fiat Societa Per Azioni Servo-assisted hydraulic braking system
US4627467A (en) * 1982-07-28 1986-12-09 Pneumo Corporation Pilot operated directional control valve
CN101096036B (zh) * 2006-06-27 2012-09-05 Sms米尔股份有限公司 用于使板材变形的内轮廓工具

Also Published As

Publication number Publication date
DE2223951A1 (de) 1973-02-01
IT959088B (it) 1973-11-10
FR2143015B1 (fr) 1973-07-13
CH541081A (de) 1973-08-31
GB1338882A (en) 1973-11-28
BE786534A (fr) 1972-11-16
FR2143015A1 (fr) 1973-02-02

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