EP0700348B1 - Hydraulic systems for winches - Google Patents
Hydraulic systems for winches Download PDFInfo
- Publication number
- EP0700348B1 EP0700348B1 EP93913642A EP93913642A EP0700348B1 EP 0700348 B1 EP0700348 B1 EP 0700348B1 EP 93913642 A EP93913642 A EP 93913642A EP 93913642 A EP93913642 A EP 93913642A EP 0700348 B1 EP0700348 B1 EP 0700348B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- control valve
- drive motor
- oil
- accumulator
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B23/00—Equipment for handling lifeboats or the like
- B63B23/40—Use of lowering or hoisting gear
- B63B23/48—Use of lowering or hoisting gear using winches for boat handling
Definitions
- Present invention relates to a hydraulic system in connection with the quartering of cargo, such as life boats or rafts, via a winch having a control valve and associated hydraulic drive motor, by means of the force of gravity and subsequent lifting of cargo or empty books by means of hydraulic motive power.
- the one operative side of the hydraulic drive motor is connected to the control valve via a first conduit connection having a first back pressure valve, which prevents the flow of pressure oil form the control valve to the drive motor, bur allows the flow of pressure oil from the drive motor to the control valve, the drive motor, during operation of the winch in the quartering direction having a cargo (the raft) hanging in the hook of a hoisting wire and with the control valve in the quartering position, being connected to an oil-gas accumulator for the storage of pressure oil.
- SE 446 173 relates to a hydraulic system containing a hydraulic cylinder or a hydraulic motor (pump) for releasing a lifeboat.
- the hydraulic system is loaded by means of the force of gravity of the lifeboat.
- the lifeboat is arranged to be moved by a release arm in a hydraulically controlled manner by means of a throttle valve arranged in a short circuit connection. It is intended to retract the release arm from the boat immediately after watering in order to avoid touching of the arm with the lifeboat in rough sea.
- the lowering of the lifeboat is used to store energy in an accumulator in the form of pressurized hydraulic fluid which is then used by the drive cylinder or drive motor.
- the throttle valve is arranged to control the driving speed of the drive cylinder or drive motor and thus causing only part of the hydraulic fluid to load the accumulator. Due to the throttle effect in the short circuit connection the loading of the accumulator may be rather restricted and casual. There is no suggestion of securing movement of the release arm back to starting position.
- the aim is a solution which can be employed without the use of hydraulic pumps.
- Present invention thus relates to a hydraulic system which is specifically designed for use in such crisis situations, where an electrical or other power source is cut out or can cut out during operation, without this having an influence on the operation of the hydraulic system.
- hydraulic system is not limited to such an application, but for operatively advantageous reasons is also applicable for conventional purposes in normal operative situations, for example in usual, sequentially following unloading operations at work locations at sea or on land.
- the aim is a hydraulic system, which makes it possible to quarter a number of units of cargo in succession, with intermediate lifting of empty hooks, without the use of electrical or similar sources of power.
- the aim is to be able to carry out a quartering operation in combination with an individual launching operation, for example for rapid and unhindered launching of a so-called "MOB-boat” (man overboard boat).
- the hydraulic system according to the invention is characterised in that, said one operative side of the drive motor is connected in addition to the control valve via a second conduit connection with a second back pressure valve, which permits the free flow of pressure oil from the control valve to the drive motor and prevents the flow of pressure oil from the drive motor to the control valve, the drive motor with the control valve in the lifting position, being connected to the oil-gas accumulator for the supply of pressure oil for the operation of the drive motor in the lifting position.
- Fig. 1 shows schematically a hydraulic system according to the invention.
- Fig. 2 shows in side view a winch for use in the hydraulic system according to Fig. 1.
- Fig. 3-5 shows the winch in combination with a crane for the launching of a so-called "MOB-boat” (man-overboard boat).
- a raft 10 which is suspended from a hoisting wire 11 via a releasable hook holder mechanism 12 in the raft 10.
- the wire 11 is wound up on a drum 13 of a hoisting and quartering winch 14.
- the winch is driven by a hydraulic drive motor 15 via a drive shaft 16 having an associated gear 17. Between the drive motor 15 and the gear 17 there is inserted a springloaded brake 18 controlled by pressure medium.
- the drive motor 15 forms a part of a hydraulic system which is controlled by means of a control valve 19.
- the control valve 19 comprises a three-way main slide valve 20 for controlling the drive motor 15 and an extra two-way slide valve 21 for controlling the brake 18.
- Main slide valve 20 of the control valve 19 is controlled by a control handle 22, which by axial displacement can adjust slide 20a of the main slide valve 20 into a starting position (neutral position), that is to say into a central position I, as shown in Fig. 1, and into two opposite outer positions II (displaced towards the left in Fig. 1) and III (displaced towards the right in Fig. 1) against the force from two equivalent opposite springs 20b and 20c.
- a starting position neutral position
- the control valve 19 In the outer position II the control valve 19 is adjusted into a lifting position for the operation of the motor 15 with associated drum 13 in a lifting direction
- the control valve 19 is adjusted into a quartering position for operation of the motor 15 with associated drum 13 in a quartering direction.
- the control handle 22 is also employed for controlling the slide valve 21 for the brake 18, the control handle 22 in such a case being moved in a direction across the direction of movement of the slide 20a, that is to say in the direction of movement of slide valve 21a of the slide valve 21.
- the slide 21a is shown in normal position A, in which the brake 18 is active.
- the brake is readjusted to a released, inactive position which permits turning of the shaft 16 with the drum 13 in a lifting direction or quartering direction determined by the setting of the slide 20a in the main slide valve 20.
- the drive motor 15 On its one side the drive motor 15 is connected to a first port opening 23 in the main slide valve 20 via a first conduit connection 24 having an associated spring-loaded back pressure valve 25 inserting in same.
- the back pressure valve 25 permits pressure medium to be led from the port opening 23 to the motor 15, but prevents pressure medium from being led from the motor 15 to the port opening 23.
- a circulation conduit 26 which is arranged outside the back pressure valve 25 and which extends between the points 26a 26b in the conduit 24, there is inserted a back pressure valve 27 and a pressure-compensated quantity valve (throttle valve) 28.
- the pressure medium from the motor 15 towards the port opening 23 can pass the back pressure valve 27 and is thereby regulated in amount via the subsequent quantity valve 28.
- the drive motor 15 is connected to a second port opening 29 in the main slide valve 20 via a second conduit connection 30 having a sequential valve 31 inserted in same.
- a circulation conduit 32 which is arranged outside the sequential valve 31 and which extends between the points 30a,30b in the conduit 30, there is inserted a back pressure valve 33.
- the back pressure valve 33 prevents pressure medium from the port opening 29 from being transferred to the motor 15 outside the sequential valve 31, but allows pressure medium from the motor 15 to the port opening 29 to be led outside the sequential valve 31.
- the tank 35 is supplied pressure medium via a filter 37 from the return oil tanks 35a and 35c.
- the main slide valve 20 is as mentioned provided on its one side with two port openings 23 and 29, and is provided on its opposite side with three port openings 38,39,40.
- the port opening 38 is connected via a conduit 41 and a branch conduit 42 to an oil chamber 43a in an accumulator 43 via a back pressure valve 44 in the conduit 42.
- the back pressure valve 44 allows pressure oil to be led from the port opening 38 to the accumulator 43, but prevents pressure oil being forced from the accumulator 43 back to the port opening 38.
- the accumulator 43 is provided on the opposite side of a membrane 43b with a gas chamber 43c which is connected via a conduit 45 to a gas flask 46.
- the port opening 39 is connected via a conduit 47 and a branch conduit 48 to the conduit 42 at a point 42a between the check valve 44 and the accumulator 43.
- a back pressure valve 49 and a shut off valve 50 In the conduit 48 there is inserted a back pressure valve 49 and a shut off valve 50.
- the back pressure valve 49 allows pressure oil to be led from the accumulator 43 to the port 39 but prevents oil being led from the port opening 39 to the accumulator 43.
- the port opening 40 is connected by means of a return conduit 51 to a return oil tank 35a.
- a branch conduit 52 extends to the return oil conduit 35b from the main slide valve 20 of the control valve 19.
- the conduit 41 from the port opening 38 is connected via the junction 48a to a conduit 60 via a junction 60a and a branch conduit 61 having a port opening 62 in a sequential valve 63.
- the sequential valve 63 is connected via a port opening 64 and a conduit 65 to a return oil tank 35c.
- the conduits 41,60 are drained to the return oil tank 35c.
- the sequential valve 63 is controlled via the pilot pressure in a branch conduit 67 from a junction 26b in the conduit 26 via a control chamber 68.
- a discharge valve 69 which is inserted in a branch conduit 70 from the junction 60a to the return oil tank 35c is controlled by a pilot pressure in a branch conduit 71 which branches off from the conduit 42 to the one side of the discharge valve 69.
- the discharge valve 69 is maintained in an uncoupled condition by means of a regulatable pressure force from a compression spring 72, but on high pilot pressures occurring in the conduit 71 from the conduit 42 the valve 69 is opened, so that pressure oil from the port opening 38 can be led directly to the return oil tank 35.
- the back pressure valve 44 closes for the flow from the accumulator via conduit 42 to conduit 41.
- a hydraulically operated directional valve 73 is placed outside the spring-loaded back pressure valve 25 in the conduit 24.
- the directional valve 73 has a first control chamber 74, which is connected via a branch conduit 75 to the junction 26a in the conduit 24, and a second, opposite chamber 76, which is connected via a branch conduit 77 to the junction 26b in the conduit 24.
- the directional valve 73 is maintained in starting position A by means of a compression spring 78.
- a first port 79 in the valve 73 is connected to the conduit 24 via a conduit connection 80 through a pressure reduction valve 81, while a second port 82 in the valve 73 is connected via a conduit 83 to the return oil tank 35 via drain pipe 37d.
- the port 79 is connected to a port opening 84 to a blind conduit 85, while the port 82 is connected to a port opening 86 to a conduit 87 to a position cylinder 88, which regulates the displacement of the motor 15 in the starting position A the motor 15 is adjusted for maximum displacement estimated for a maximum quantity of oil during quartering and lifting of the raft 10 via the drum 13, that is to say while the raft exerts a specific pull on the hoisting wire 11.
- the sequential valve 31 in the conduit 30 and the sequential valve 63 in the conduit connection 60-65 will be open and pressure oil can be led from main valve 20 of the control valve 19 via the port openings 39 and 29 through the sequential valve 31 in the conduit 30 to the motor 15, while the return oil is conveyed from the motor 15 via the ports 23,38 in the main valve 20 and via the conduits 41,60,61,65 to the return oil tank 35.
- a winch corresponding to the winch 14 of Fig. 1, having the drum 13 arranged on the one side of a winch housing 14a and the gear 17, the brake 18 and the hydraulic drive motor/pump 15 arranged on the opposite side of the winch housing 14a. On the drum 13 some windings of hoisting wire 11 are shown.
- a crane 90 is shown for the launching of a so-called "MOB-boat” (man-overboard boat) 10a from an inactive position just outside a deck termination 91 on a platform deck 92.
- the boat 10a is locked in place in the illustrated inactive position with a pair of readily releasable lashings 89.
- a separate safety line 93 fastened in between the outer end of the crane 90 and the boat 10a, where the line 93 via a hook 94 is fastened together with a hoisting line hook 95 in a common fastening ring 96 which is hooked into a manually releasable hook holding means 12 fastened to the top of a support hoop 97 in the boat 10a.
- the boat 10a After releasing lashings 89 and the safety line 93 the boat 10a is ready for launching by actuating control valve 19 of the winch. If necessary the control valve 19 can be actuated by remote control from the boat. After the boat 14a is put down on the sea the boat can be set free from the hoisting wire 11 by manual release of the hook holding means 12. In instances where the boat after use is to be raised up again to the starting position on the deck 92 a separate crane (not shown further) can be employed for this.
- the crane 90 carries the winch 14 at its lower end and has the accumulator 43 fastened along one side portion 90a of the crane. Between the accumulator 43 and the hydraulic motor/pump 15 of the winch there is illustrated the control valve 19 with associated handle 22. In addition there is shown an extra oil container 98 and a manual pump 99 with associated pump handle 99a. The pump 99 is coupled to the motor/pump 15 in a manner not shown further so that one can undertake manual lifting of the wire 11 with associated empty hook in an emergency where this has to be necessary.
- a davit arrangement or a crane arrangement which is specifically designed for such a purpose, so that the lifeboats can be swung with the davit arrangement or the crane arrangement from an inactive position on deck to an active launching position outside the deck. If necessary this task of swinging can also be carried out by means of the force of pressure oil which is stored in the accumulator 43 after a preceding launching operation.
Landscapes
- Fluid-Pressure Circuits (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Earth Drilling (AREA)
- Control And Safety Of Cranes (AREA)
- Vehicle Body Suspensions (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims (6)
- Hydraulic system in connection with the quartering of cargo, such as lifeboats, rafts (10) or other cargo, via a winch (14) having a control valve (19) and associated hydraulic drive motor (15), by means of the force of gravity and subsequent lifting of cargo or empty hooks by means of hydraulic motive power, where one operative side of the hydraulic drive motor (15) is connected to the control valve (19) via a conduit connection (24,26,24) having a first back pressure valve (27), which prevents the flow of pressure oil from the control valve (19) to the drive motor (15), but allows the flow of pressure oil from the drive motor (15) to the control valve (19), the drive motor (15), during operation of the winch (14) in the quartering direction with a cargo (the raft 10) hanging in the hook of a hoisting wire (11) and with the control valve (19) in quartering position (III), being connected to an oil-gas accumulator (43) for the storage of pressure oil, characterised in that
said one operative side of the drive motor (15) is connected to the control valve (19) via a first conduit connection (24) having a second back pressure valve (25), whereas said first back pressure valve (27) is incorporated in a separate conduit connection (24,26,24) outside said second back pressure valve (25), whereas said second back pressure valve (25) allows the free flow of pressure oil from the control valve (19) to the drive motor (15) and prevents the flow of pressure oil from the drive motor (15) to the control valve (19), the drive motor (15), with the control valve (19) in the lifting position (II), being connected to the oil-gas accumulator (43) for feeding pressure oil for the operation of the drive motor (15) in the lifting direction. - Hydraulic system in accordance with claim 1,
characterised in that
the separate conduit connection (24,26,24) between the control valve (19) and the first back pressure valve (27) is provided with a quantity regulating valve (28) which, with the control valve (19) in the quartering position (III), regulates the flow of pressure oil from the drive motor (15) to the control valve (19). - Hydraulic system in accordance with claim 1 or 2,
characterised in that
the drive motor (15) is adjustable into a first position having maximum displacement for use in quartering and into a second position having minimal displacement for use in lifting, and that a means (88), which is adapted to readjust the displacement of the drive motor (15) by means of a directional valve (73), is controlled by the oil pressure which prevails in the conduit connection (24;24,26,24) between the drive motor (15) and the control valve (19) and is preferably controlled by a pressure drop over the back pressure valve (25,27) in said conduit connection (24). - Hydraulic system according to claim 1,
characterised in that
the accumulator (43) is connected to the control valve (19) via a third conduit connection (41,42) which includes a third back pressure valve (44), which allows pressure oil to flow from the control valve (19) to the accumulator (43) but prevents pressure oil form flowing from the accumulator (43) to the control valve (19), and that the accumulator (43) is connected to the control valve (19) via a fourth conduit connection (42,48,47) which includes a shut off valve (50) and a fourth back pressure valve (49) which allows the flow of pressure oil from the accumulator (43) to the control valve (19), but prevents the flow of pressure oil from the control valve (19) to the accumulator (43). - Hydraulic system in accordance with claim 4,
characterised in that
a normally closed discharge valve (69) is open in the fully charged condition of the accumulator (43) in order to lead surplus pressure oil from the control valve (19) to the return oil tank (35) outside the third back pressure valve (44), the discharge valve (69) being controlled by a high oil pressure occurring in a pilot conduit (71) from the conduit connection (42) between the oil-gas accumulator (43) and the said third back pressure valve (44). - Hydraulic system in accordance with claim 4,
characterised in that
a sequential valve (63), which is inserted in a conduit connection (41,60-65) between the control valve (19) and a return oil tank (35c) and which by means of a compression spring (66) is adjusted into an open position between the control valve (19) and the return oil tank (35c), is readjustable to a closed position by means of a reverse acting control chamber (68) which is controlled by the oil pressure which prevails between the drive motor (15) and the back pressure valve (25,27) in the first and/or the second conduit connection (24;24,26).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO920577A NO175202C (en) | 1992-02-13 | 1992-02-13 | Hydraulic winch system |
PCT/NO1993/000087 WO1994027864A1 (en) | 1992-02-13 | 1993-06-01 | Hydraulic systems for winches |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0700348A1 EP0700348A1 (en) | 1996-03-13 |
EP0700348B1 true EP0700348B1 (en) | 1998-08-12 |
Family
ID=26648330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93913642A Expired - Lifetime EP0700348B1 (en) | 1992-02-13 | 1993-06-01 | Hydraulic systems for winches |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0700348B1 (en) |
JP (1) | JP2769246B2 (en) |
AT (1) | ATE169576T1 (en) |
AU (1) | AU4360193A (en) |
DE (1) | DE69320372T2 (en) |
DK (1) | DK0700348T3 (en) |
ES (1) | ES2122022T3 (en) |
NO (1) | NO175202C (en) |
WO (1) | WO1994027864A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10213010A1 (en) * | 2002-03-22 | 2003-10-02 | Bosch Rexroth Ag | control |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2269786A (en) * | 1941-04-28 | 1942-01-13 | Vickers Inc | Power transmission |
DE3040717A1 (en) * | 1980-10-29 | 1982-05-27 | Allweiler Ag, 7760 Radolfzell | Hydraulic lift operating system - uses fluid from ram on lowering to drive pump charging pressure accumulator |
SE446173B (en) * | 1982-07-01 | 1986-08-18 | Tell Nico Ab Von | DEVICE FOR OFFSHORE PLATFORM Dedicated Rescue Cabin |
DD267293A1 (en) * | 1987-12-24 | 1989-04-26 | Warnke Umformtech Veb K | CIRCUIT ARRANGEMENT FOR CONTROLLING A HYDRAULIC DRIVE ENGINE WITH ENERGY RECOVERY DURING THE BRAKING PROCESS |
-
1992
- 1992-02-13 NO NO920577A patent/NO175202C/en unknown
-
1993
- 1993-06-01 AU AU43601/93A patent/AU4360193A/en not_active Abandoned
- 1993-06-01 AT AT93913642T patent/ATE169576T1/en not_active IP Right Cessation
- 1993-06-01 DE DE69320372T patent/DE69320372T2/en not_active Expired - Fee Related
- 1993-06-01 DK DK93913642T patent/DK0700348T3/en active
- 1993-06-01 EP EP93913642A patent/EP0700348B1/en not_active Expired - Lifetime
- 1993-06-01 WO PCT/NO1993/000087 patent/WO1994027864A1/en active IP Right Grant
- 1993-06-01 JP JP7500497A patent/JP2769246B2/en not_active Expired - Lifetime
- 1993-06-01 ES ES93913642T patent/ES2122022T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10213010A1 (en) * | 2002-03-22 | 2003-10-02 | Bosch Rexroth Ag | control |
Also Published As
Publication number | Publication date |
---|---|
JP2769246B2 (en) | 1998-06-25 |
AU4360193A (en) | 1994-12-20 |
NO175202C (en) | 1994-09-21 |
ATE169576T1 (en) | 1998-08-15 |
WO1994027864A1 (en) | 1994-12-08 |
DE69320372T2 (en) | 1999-04-08 |
DE69320372D1 (en) | 1998-09-17 |
JPH08510435A (en) | 1996-11-05 |
ES2122022T3 (en) | 1998-12-16 |
NO175202B (en) | 1994-06-06 |
DK0700348T3 (en) | 1999-05-10 |
EP0700348A1 (en) | 1996-03-13 |
NO920577D0 (en) | 1992-02-13 |
NO920577L (en) | 1993-08-16 |
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