EP0238356A2 - Système de commande pour un moteur hydraulique - Google Patents

Système de commande pour un moteur hydraulique Download PDF

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Publication number
EP0238356A2
EP0238356A2 EP87302438A EP87302438A EP0238356A2 EP 0238356 A2 EP0238356 A2 EP 0238356A2 EP 87302438 A EP87302438 A EP 87302438A EP 87302438 A EP87302438 A EP 87302438A EP 0238356 A2 EP0238356 A2 EP 0238356A2
Authority
EP
European Patent Office
Prior art keywords
valve
winch
conduit
motor
control system
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.)
Granted
Application number
EP87302438A
Other languages
German (de)
English (en)
Other versions
EP0238356A3 (en
EP0238356B1 (fr
Inventor
James Rogerson
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.)
Monyana Engineering Services
Original Assignee
Monyana Engineering Services
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
Priority claimed from GB868606940A external-priority patent/GB8606940D0/en
Priority claimed from GB868626045A external-priority patent/GB8626045D0/en
Application filed by Monyana Engineering Services filed Critical Monyana Engineering Services
Publication of EP0238356A2 publication Critical patent/EP0238356A2/fr
Publication of EP0238356A3 publication Critical patent/EP0238356A3/en
Application granted granted Critical
Publication of EP0238356B1 publication Critical patent/EP0238356B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear
    • B66D1/56—Adaptations of limit switches

Definitions

  • This invention relates to a control system for a fluid actuated motor.
  • Fluid actuated motors may be used to provide the prime movers of, for example, winches which are widely used for raising and lowering equipment; it is often very important to limit the action of a motor, and thus in the given example the action of the winch, so that the cable around the winch drum or the like does not pay out to its full extent thereby placing the entire weight of the equipment on the anchorage of the cable to the winch, or so that the cable does not overwind around the winch drum thereby causing the cable to leave its winding path on the drum.
  • An object of this invention is to provide a system which will provide a control for a fluid actuated motor.
  • a control system for a fluid actuated motor comprising a conduit for feeding fluid to the motor, a valve actuable to open and close the conduit, and means for actuating the valve to open or close the conduit when a predetermined condition is achieved through operation of the motor.
  • the actuating means comprises a second conduit for feeding fluid to the valve, and means for closing the second conduit when said predetermined condition is achieved, wherein closure of the second conduit results in actuation of the first valve to close the main conduit.
  • the motor may provide a prime mover of a winch and the actuating means may comprise cam means movable with the winch and engageable with a cam follower which is operatively connected with the valve.
  • the cam means comprises a disc or plate which rotates on operation of the winch and whose periphery is non-uniform and the cam follower bears against said periphery for actuation of the valve on engagement with said non-uniformity.
  • the non-uniformity may be a projection or a recess.
  • the actuating means may comprise a pressure sensor which monitors the load on the winch and actuates the valve to close the conduit on achievement of a predetermined load.
  • the pressure sensor may comprise a first monitor which causes the actuating means to close the valve at winch loads above a first predetermined value and a second monitor which causes the actuating means to close the valve at winch loads below a second predetermined value.
  • the pressure sensor preferably includes a piston which is connected to the winch and movable within a cylinder so that pressure of fluid in the cylinder is increased or decreased in response to the load on the winch; this provides a safety system for deactuating the motor in the event of the cable, or the equipment being winched up or down, becoming snagged on an obstruction, and prevents continued tensioning or paying out of the cable.
  • the fluid may be for example air or hydraulic fluid.
  • the system of this embodiment of the invention has a pneumatically-driven motor 2 which is fed with pressurised air through an air line 4.
  • a valve 6 is spring-biassed into a closed position in which it cuts off flow through the air line 4.
  • a branch air line 8 in the form of a pilot line extends from a T-piece in the main air line 4 through a control box 10 to the valve 6, the air pressure in the branch line 8 holding the valve 6 open against its bias to allow flow of air to the motor 2.
  • a quick-exhaust valve 12 is provided in the branch line 8 for bleeding off air instantaneously in the event of closure of the branch line 8, and a pneumatic horn 14 and actuating valve 16 are built into a pilot line 18 which short-circuits the branch line 8 in parallel with the control box 10. The valve 16 closes off flow to the horn when the air pressure in the branch lines 8a and 8b are equal, and opens flow when the pressure in the line 8a exceeds that in the line 8b.
  • the control box 10 houses two valves 20, 22 each of which has an outwardly-biassed piston 24 (Fig. 3) which bears against a peripheral surface of a respective rotatable actuator plate 26, 28.
  • Each plate 26, 28 has a recess 29 into which the piston 24 can move, and on such movement the valve 20, 22 switches from an open to a closed mode, cutting off flow of air through the control box 10 by way of the branch line 8.
  • a further pilot line 30 extends across the branch lines 8a and 8b through a valve 32 which is normally closed but which is manually openable by means of a plunger 34.
  • the actuator plates 26, 28 are mounted on an output shaft 36 of a 1960:1 gearbox 38 (Fig. 2) whose input shaft 40 is driven from the main.winch gearbox connected to the motor 2.
  • the plates 26, 28 are held on the shaft 36 by a lock nut 42, and are calibrated at 44 to relate to the movement of the winch.
  • pressurised air is pumped along the main air line 4 through the open valve 6 to the motor 2 which thus drives the winch.
  • the air also passes along the branch line 8 through the control box 10 to the valve 6, maintaining it in its open position.
  • the winch rotates, its mechanical drive through the gearbox actuates the plates 26, 28 through the shaft 40, gearbox 38 and shaft 36, causing the plates to rotate very slowly.
  • valve 22 enters the corresponding recess 29 in the other actuator plate 28, with the same result.
  • the plunger 34 on the valve 32 is depressed, thus opening the valve and providing air flow from the line 8a to the line 8b through the line 30, closing the valve 16 and silencing the horn 14.
  • This opens the valve 6 against its spring bias and reactuates the motor 2, taking the piston 24 out of the recess 29 as the plates 26, 28 rotate, and re-opening the valve 20, 22.
  • the plunger can then be released.
  • the motor or gearbox may be provided with means which automatically reverses the direction of the winch each time cut-off occurs, with a manual switch for overriding it.
  • Fig 3b there is shown an alternative embodiment of the actuator plate 26, of Fig. 3a, wherein the recesses 29 are replaced with cam projections 31 that may extend to 25% of the plate circumference.
  • the valve 45 of Fig. 3b operates in reverse of those of Fig. 3a and thus on movement of cam follower 47 over the cam projection 31 and a consequent insertion of the piston 44 into the valve body, the valve 45 switches from an open to a closed position.
  • the winch cable runs over a sheave 46 which is pivotally mounted on a support 48 through an arm 50.
  • a shaft 52 is pivotally connected to the arm 50 and carries limit load valve assembly 48 including a piston 54 at its lower end.
  • the piston 54 is located in a cylinder 56 and hydraulic fluid 58 is pressurised by the piston 54.
  • An aperture in the cylinder wall communicates with a valve 60 which is disposed in the fluid circuit of Fig. 1 in series with the valves 20, 22.
  • the valve 60 is held open by the pressure of the fluid 58 and closes when the pressure drops.
  • valve 60 Normally the valve 60 is open in use as the weight of a load being winched pulls the sheave 46 downwards, pressurising the fluid 58, but if the load becomes snagged on an obstruction, or reaches a support at the end of its travel, its weight is released from the sheave 46 and the pressure of the fluid 58 drops, closing the valve 60 and thus stopping the winch motor 2 as described in relation to Fig. 1.
  • a dual-valve system comprising a normally-closed low-pressure valve 61 and a normally-open high-pressure valve 62 fitted to branch line 8b and in series with the control box 10.
  • the valve 61 may be selected to open at a load in excess of 400 lbs, while the valve 62 may be selected to close at a load in excess of 4000 lbs.
  • Both valves are adjustable, the switching mechanisms 67, 68, being shown in detail in Fig. 7.
  • the limit load valve assembly 48 is on a branch line 63 which runs in parallel to the branch line 8; the hydraulic fluid 58 of the assembly 48 is provided with a top-up reservoir 64 which is supplied via a one-way valve 65, and an alternative pressure source 66 to give override if selected.
  • both valves 61,62 are open as the weight of the load being winched pulls the sheave downwards, pressurising the fluid 58.
  • the increased tension on the cable tends to pull the sheave downwards, increasing the hydraulic pressure in cylinder 56 and closing the high pressure valve 62, thus cutting off air flow to the winch motor 2.
  • the low pressure valve 61 closes, also shutting down the winch motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP19870302438 1986-03-20 1987-03-20 Système de commande pour un moteur hydraulique Expired EP0238356B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8606940 1986-03-20
GB868606940A GB8606940D0 (en) 1986-03-20 1986-03-20 Winch safety systems
GB868626045A GB8626045D0 (en) 1986-10-31 1986-10-31 Winch safety system
GB8626045 1986-10-31

Publications (3)

Publication Number Publication Date
EP0238356A2 true EP0238356A2 (fr) 1987-09-23
EP0238356A3 EP0238356A3 (en) 1990-01-17
EP0238356B1 EP0238356B1 (fr) 1992-12-16

Family

ID=26290516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870302438 Expired EP0238356B1 (fr) 1986-03-20 1987-03-20 Système de commande pour un moteur hydraulique

Country Status (3)

Country Link
EP (1) EP0238356B1 (fr)
DE (1) DE3783058D1 (fr)
NO (1) NO871162L (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986884A (en) * 1959-03-02 1961-06-06 Whiting Corp Hydraulic hoist control circuit
DE2028446A1 (de) * 1969-06-10 1970-12-23 Societä" per Azioni Edilmac, Mailand (Italien) Hydraulische Winde mit Fernsteuerung und automatischer Regelung
FR2096496A1 (fr) * 1970-06-26 1972-02-18 Bowmaker Plant Ltd
FR2140477A1 (fr) * 1971-06-09 1973-01-19 Orenstein & Koppel Ag
GB2074970A (en) * 1980-04-26 1981-11-11 Ransomes & Rapier Ltd Control of apparatus in which a rope is wound on a drum
EP0101743A1 (fr) * 1982-03-01 1984-03-07 Endo Kogyo Co.Ltd. Treuil
US4448394A (en) * 1982-09-30 1984-05-15 Koomey, Inc. High low safety apparatus for drilling rigs

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986884A (en) * 1959-03-02 1961-06-06 Whiting Corp Hydraulic hoist control circuit
DE2028446A1 (de) * 1969-06-10 1970-12-23 Societä" per Azioni Edilmac, Mailand (Italien) Hydraulische Winde mit Fernsteuerung und automatischer Regelung
FR2096496A1 (fr) * 1970-06-26 1972-02-18 Bowmaker Plant Ltd
FR2140477A1 (fr) * 1971-06-09 1973-01-19 Orenstein & Koppel Ag
GB2074970A (en) * 1980-04-26 1981-11-11 Ransomes & Rapier Ltd Control of apparatus in which a rope is wound on a drum
EP0101743A1 (fr) * 1982-03-01 1984-03-07 Endo Kogyo Co.Ltd. Treuil
US4448394A (en) * 1982-09-30 1984-05-15 Koomey, Inc. High low safety apparatus for drilling rigs

Also Published As

Publication number Publication date
EP0238356A3 (en) 1990-01-17
NO871162D0 (no) 1987-03-20
DE3783058D1 (de) 1993-01-28
EP0238356B1 (fr) 1992-12-16
NO871162L (no) 1987-09-21

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