EP0018832A2 - Régulateurs de position - Google Patents

Régulateurs de position Download PDF

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Publication number
EP0018832A2
EP0018832A2 EP80301433A EP80301433A EP0018832A2 EP 0018832 A2 EP0018832 A2 EP 0018832A2 EP 80301433 A EP80301433 A EP 80301433A EP 80301433 A EP80301433 A EP 80301433A EP 0018832 A2 EP0018832 A2 EP 0018832A2
Authority
EP
European Patent Office
Prior art keywords
lever
unit
movement
energized
location
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.)
Withdrawn
Application number
EP80301433A
Other languages
German (de)
English (en)
Other versions
EP0018832A3 (fr
Inventor
Richard John Gough
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.)
Danks Holding Ltd
Original Assignee
Babcock Bristol 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 Babcock Bristol Ltd filed Critical Babcock Bristol Ltd
Publication of EP0018832A2 publication Critical patent/EP0018832A2/fr
Publication of EP0018832A3 publication Critical patent/EP0018832A3/fr
Withdrawn legal-status Critical Current

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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
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device

Definitions

  • This invention is concerned with the control of the movement of a mumber that may itself be the control element of a valve and arose from a consideration of the problems involved in controlling the movement of massive components by devices that themselves can exert only small forces.
  • the member might be the control element of a large valve, and it might be desirable to control the movement of that element by a pneumatic valve that itself is adjusted by means, such as a stepping or pulsing motor, that can exert only a small but precise force.
  • means for controlling the extent of the movement of the member including a lever pivoted at two locations that are spaced apart, actuating means by which each pivot location can be moved to-and-fro in a direction transverse to the direction in which the pivot locations are spaced apart, a controlling connection between the unit and the lever that is associated with the lever at a location that, in said direction, is spaced apart from each of the pivot locations, one of the actuating means including a crank arm pivotally connected to the lever at one pivot location and the other including a connection to the member such that the position of the other pivot location is dependent upon the position of the member, the arrangement being such that the unit is not energized when the location at which the unit is connected to the lever is co-incident with the axis about which the crank arm turns, with the lever in a base position in which that co-incidence occurs, rotation of the crank
  • means for controlling the extent of the movement of the member including a lever pivoted at two locations that are spaced apart, actuating means by which each pivot location can be moved to-and-fro in a direction transverse to the direction in which the pivot locations are spaced apart, a controlling connection between the unit and the lever that is associated with the lever at a location that, in said direction, is spaced apart from each of the pivot locations, one of the actuating means including a crank arm pivotally connected to the lever at one pivot location and the other including a connection to the member such that the position of the other pivot location is dependent upon the position of the member, the arrangement being such that the unit is not energized when the location at which the unit is connected to the lever is co-incident with the axis about which the crank arm turns, with the lever in a base position in which that co-incidence occurs, rotation of
  • the member of which the position is to be controlled is the valve piston 1, movement of which is effected pneumatically through the double acting pilotrol,or balanced spool, valve 2.
  • the valve 2 prevents operation of the valve piston 1.
  • the stepper motor 10 acting through the gear box 11, is used.
  • connection 13a Fixed to the output spindle 12 of the gear box 11 is a crank arm 13 that is pivotally connected on spindle 13a, at some distance from the spindle 12, to a lever 14.
  • the connection 13a is spaced from the end of the lever 14 and there is a controlling connection between that end and the stem 3.
  • the connection includes a link 15 pivotally connected at its lower end to the stem 3 and at its upper end to the lever 14 through a nut-and-rod connector 16 that, in operation, is fixed but is adjustable in setting up the apparatus to allow the position of the connection to the upper end of the link 15 to be varied.
  • the lever 14 carries a roller 20 that acts as a cam follower.
  • the edge of plate 21 acts as the cam surface and the plate is fixed to an arm 22 that is pivotally connected to the stem la of the valve piston 1.
  • the stem la turns about a fixed pivot 23 as the stem la moves, so that the plate 21 also turns about that pivot and moves the lever 14 through the engagement of the cam follower 20 with the plate 21.
  • the cam surface is not a circle centred on the pivot 23 but resembles more a part of an ellipse with the pivot 23 as one of its centres.
  • the plate 21 is fixed to the arm 22 in such a way that their relative orientation can be adjusted so that the movement of the cam follower 20 resulting from a particular movement of the stem la can be varied.
  • a spring 30 is provided to ensure engagement of the cam follower 20 with the cam surface.
  • the valve piston 1 By rotating the crank arm 13 in the reverse sense, the valve piston 1 can be moved in the opposite sense. This will rotate the plate 21 appropriately and the roller 20 will be kept in contact with the plate 21 by the spring 30. Consequently, the lever 14 will achieve a second closing position in which the connection between the stem 3 and the lever 14 is co-incident with the spindle 12.
  • This closing position is determined by the extent to which the crank arm 13 is rotated and this, too, is controlled in accordance with the extent to which the piston valve is intended to move.
  • the base position may be the median between a first and a second closing position.
  • the axis of the spindle 12a, the contact between the cam follower 20 and the plate 21, and the point of connection between the spindle 3 and the lever 14 are co-linear.
  • the to-and-fro movements, in operation, of the spindle 13a and the cam follower 20 transverse to this line are virtually perpendicular to the line.
  • the pneumatic valve 2 might be replaced by an electrical switch device which maintains energized means by which the valve piston 1 is moved until that member reaches its final position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Power Steering Mechanism (AREA)
EP80301433A 1979-05-04 1980-05-01 Régulateurs de position Withdrawn EP0018832A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7915693 1979-05-04
GB7915693 1979-05-04

Publications (2)

Publication Number Publication Date
EP0018832A2 true EP0018832A2 (fr) 1980-11-12
EP0018832A3 EP0018832A3 (fr) 1981-05-13

Family

ID=10504978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80301433A Withdrawn EP0018832A3 (fr) 1979-05-04 1980-05-01 Régulateurs de position

Country Status (3)

Country Link
EP (1) EP0018832A3 (fr)
DK (1) DK191580A (fr)
NO (1) NO801268L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548459A1 (fr) * 1991-12-20 1993-06-30 Sensycon Gesellschaft Für Industrielle Sensorsysteme Und Prozessleittechnik Mbh Dispositif pour convertir un signal électrique vers une position mécanique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570624A (en) * 1946-11-19 1951-10-09 Gulf Research Development Co Follow-up pneumatic servomotor
US2781744A (en) * 1954-09-02 1957-02-19 Hogan Corp Pneumatic signal responsive hydraulically actuated positioners for high pressure servo-valves provided with a compensating or followup mechanism
US3899956A (en) * 1973-11-05 1975-08-19 Olsen Controls Inc Linear electrohydraulic pulse drive actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548459A1 (fr) * 1991-12-20 1993-06-30 Sensycon Gesellschaft Für Industrielle Sensorsysteme Und Prozessleittechnik Mbh Dispositif pour convertir un signal électrique vers une position mécanique

Also Published As

Publication number Publication date
DK191580A (da) 1980-11-05
EP0018832A3 (fr) 1981-05-13
NO801268L (no) 1980-11-05

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Withdrawal date: 19810922

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Inventor name: GOUGH, RICHARD JOHN