EP0084215A2 - Steuerung für pneumatischen Motor - Google Patents

Steuerung für pneumatischen Motor Download PDF

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Publication number
EP0084215A2
EP0084215A2 EP82305235A EP82305235A EP0084215A2 EP 0084215 A2 EP0084215 A2 EP 0084215A2 EP 82305235 A EP82305235 A EP 82305235A EP 82305235 A EP82305235 A EP 82305235A EP 0084215 A2 EP0084215 A2 EP 0084215A2
Authority
EP
European Patent Office
Prior art keywords
spool
control unit
valve
control
connection
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Withdrawn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
EP82305235A
Other languages
English (en)
French (fr)
Other versions
EP0084215A3 (de
Inventor
John Edward Garrard
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.)
JH Fenner and Co Ltd
Original Assignee
JH Fenner and 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 JH Fenner and Co Ltd filed Critical JH Fenner and Co Ltd
Publication of EP0084215A2 publication Critical patent/EP0084215A2/de
Publication of EP0084215A3 publication Critical patent/EP0084215A3/de
Withdrawn legal-status Critical Current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
    • F15B13/02—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
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure

Definitions

  • the present invention relates to the control of pneumatic motors and in particular to a pendant control unit for operating remotely a main control valve of a pneumatic motor.
  • the pendant control unit is particularly suitable for use with a main control valve.
  • a main air supply passes by way of a variable restrictor through to an output port and continues by way of another variable restrictor to an exhaust port.
  • Both variable restrictors are ganged together and in the neutral off position the first restrictor,that is the mains restrictor,is closed and the second restrictor, that is the exhaust restrictor, is wide open, hence zero output signal.
  • the restrictors are formed by respective tapered portions on a plunger and when this plunger is moved then the mains restriction is gradually opened and at the same time the exhaust restriction is gradually closed. Because the unit throughout its cycle exhausts a small degree of air then the unit is live throughout its operational life and a finite pressure can be achieved.
  • the invention sets out to provide a control unit having superior control over the entire movement range of the valve.
  • a control unit for the remote control of a pneumatic motor main valve having a fixed control orifice disposed between a main supply connection and an output connection and a variable orifice disposed between the output connection and an exhaust point.
  • the fixed control orifice and the variable orifice are formed by respective parallel and tapered portions of a spool.
  • the spool may be tapered up to five degrees but preferably has a one degree taper.
  • the spool is axially slidable either directly or by way of a lever pivotally connected to a housing of the control unit and abutting one end of the plunger which emerges from the housing.
  • the plunger is balanced so that the unit does not jump open upon initial movement.
  • the plunger is returned to the neutral position under the action of a spring, in which position the main supply is sealed off from the output connection and the exhaust taper is wide open venting the exhaust connection.
  • the response curve of Fig.l illustrates the relationship between valve travel (Vt) and output pressure (Po) for a known remote control unit having a tapered inlet restriction and a tapered exhaust restriction which are ganged together. It will be seen that initially the pressure rises only slowly for relatively long travel and subsequently the pressure rises more rapidly. The valve is not effective over the full travel. It has an effective section Es and a dead section Ds.
  • the control unit in accordance with the invention provides a more smooth response curve in which the pressure rises more gradually over the full valve travel (Vtf) thus giving an improved feel to the unit (see Figure 3, which shows output pressure P plotted against valve travel Vt for the control unit according to the invention).
  • a pendant control valve unit having a housing 1 provided with a body portion 3 and a handle 5.
  • the illustrated pendant valve illustrates a six station unit particularly suitable for use with overhead travelling cranes where six movements have to be controlled, namely raise, lower, traverse left, traverse right, up and down stop, thus the unit is provided with six valve units, only three of which are shown in the sectional drawing, the other three being positioned by the side of these three. All the valves are constructed in an identical manner although it will be noted that the upper two pairs are button operated whilst the lower pair are lever operated. The lower pair control the raise and lower of the hoist and as such the levers accentuate the degree of control available at the valve.
  • a stepped bore 9 is machined into the body 3 and a main spool 11 is received in the smaller diameter of the stepped bore 9.
  • the spool 11 is axially slidable in the bore 9 and is provided with a tapered portion 13 which co-operates with the smaller diameter portion of the bore 9 to form a variable orifice.
  • the spool has a parallel portion 15 which together with the small bore 9 forms a fixed orifice 51.
  • the spool has a reduced diameter 11 between the parallel and tapered portions.
  • a shoulder 17 formed between the larger and smaller diameter portions of the bore 9 constitutes a valve seat with which a valve member 19 in the form of an 0-ring seal carried by the spool co-operates.
  • a mains air supply inlet port 21 opens into the larger diameter portion of the bore 9 and an output connection -23 opens into the smaller diameter portion of the bore 9.
  • An end 25 of the spool 11 projects from the valve body 3 and carries a button by means of which the spool can be axially displaced.
  • the end of the spool remote from the button is received sealingly in a bore 26 of a plug 27 and is acted on by a return spring 29.
  • the bore 26 in which the return spring 29 is received is vented to atmosphere by way of a vent passage 31.
  • the closure member 19 opens the valve seat 17 and air is permitted to flow through inlet restriction 51 from the mains air inlet through to the output connection 23.
  • the output connection leads to a main valve which is changed over so as to direct air to the motor.
  • the air passing to the output connection is also permitted to exhaust by way of the variable orifice and the amount of air which is exhausted is dependent upon the position of the valve spool 11.
  • the valve spool carries an 0-ring seal 33 by means of which the exhaust may be sealed off completely so permitting mains pressure on the output and full speed operation of the motor.
  • valve spool areas are balanced so that upon opening of the valve member the spool does not jump open but gives smooth finger tip operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Valve Device For Special Equipments (AREA)
EP82305235A 1981-10-02 1982-10-01 Steuerung für pneumatischen Motor Withdrawn EP0084215A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8129861 1981-10-02
GB8129861 1981-10-02

Publications (2)

Publication Number Publication Date
EP0084215A2 true EP0084215A2 (de) 1983-07-27
EP0084215A3 EP0084215A3 (de) 1984-01-04

Family

ID=10524921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82305235A Withdrawn EP0084215A3 (de) 1981-10-02 1982-10-01 Steuerung für pneumatischen Motor

Country Status (2)

Country Link
EP (1) EP0084215A3 (de)
JP (1) JPS5878991A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263532A (en) * 1992-01-24 1993-07-28 Hodge Clemco Ltd Automatic shut-off valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1328037A (fr) * 1962-06-04 1963-05-24 Zahnradfabrik Friedrichshafen Organe de distribution à arête décolletée en gradin utilisable dans les installations hydrauliques

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1328037A (fr) * 1962-06-04 1963-05-24 Zahnradfabrik Friedrichshafen Organe de distribution à arête décolletée en gradin utilisable dans les installations hydrauliques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263532A (en) * 1992-01-24 1993-07-28 Hodge Clemco Ltd Automatic shut-off valve

Also Published As

Publication number Publication date
EP0084215A3 (de) 1984-01-04
JPS5878991A (ja) 1983-05-12

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

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Withdrawal date: 19850528

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GARRARD, JOHN EDWARD