KR100276627B1 - Hydraulic System for Winches - Google Patents

Abstract

The hydraulic system is adjusted by a winch 14 with a control valve 19 and a drive motor 15 to place the lifeboat 10 from top to bottom by gravity and then lift the bin hook by hydraulic pressure. On one side of the drive motor 15, the control valve is in the arrangement position III, which is connected to the accumulator 43 to receive the pressure oil during operation of the drive motor 15 in the arrangement direction. At one end of the drive motor 15, the control valve 19 is in the lifting position II, which is connected to the accumulator 43 to supply pressure oil while the drive motor 15 is operating in the lifting direction.

Description

Hydraulic System for Winches

1 is a circuit diagram of a hydraulic system according to the present invention.

2 is a side view of a winch for use in the hydraulic system of FIG.

3 to 5 are explanatory diagrams showing that the winch is used with a crane used to launch a lifeboat.

<Explanation of symbols for main parts of drawing>

10: lifeboat 11: hoisting wire

14: winch 15: hydraulic drive motor

19: control valve 24, 26: conduit

25, 27: back pressure valve 43: oil-gas accumulator

The present invention provides a winch hydraulic system for lowering cargo such as a lifeboat from an upper position to a lower position by gravity through a winch having a control valve and a hydraulic driving motor, and lifting a hook to lift the cargo or cargo by hydraulic driving force. It is about. One side of the hydraulic drive motor is connected to the control valve through a first connecting conduit having a first back pressure valve. This back pressure valve prevents the pressure oil from flowing through the control valve to the drive motor, but allows the pressure oil to flow from the drive motor to the control valve. The drive motor allows cargo (lifeboats) to hang on the hooks of the hoisting wire The control valve is connected to the oil-gas accumulator for the storage of pressure oil during the downward operation of the winch, which is prepared in the lowered state.

Swedish patent SE 446 173 describes a hydraulic system having a hydraulic cylinder or hydraulic motor (pump) for releasing lifeboats. The hydraulic system is subjected to the gravity of the lifeboat. The lifeboat can be moved by a release arm in a hydraulic control system by a throttle valve composed of a short circuit connection structure. In order to prevent release arms from hitting lifeboats in bad weather, lifeboats can be withdrawn immediately after launch. In order to be able to withdraw this release arm regardless of external driving force, the lowering of the lifeboat is used to store energy in the accumulator in the form of pressurized hydraulic fluid used by the drive cylinder or drive motor. The throttle valve is configured to control the driving speed of the driving cylinder or the driving motor so that only a part of the hydraulic fluid can be filled in the accumulator. In short-circuit connection structures the charge to the accumulator is limited and irregular due to the throttle effect. In this patent document, no fixing motion of the release arm relative to the starting position is proposed.

Relating to life-saving operations at sea, where multiple lifeboats must be launched one after the other on the same launch platform, under various working conditions, especially under difficult working conditions, which can often arise, such as in critical crises such as barges and oil rigs Possible hydraulic systems are required.

It is an object of the present invention to provide a solution which can be employed without the use of a hydraulic pump.

The present invention relates in particular to a hydraulic system configured for use in such a crisis situation, in which such an electrical or other power source can be cut off or cut off during operation without affecting the operation of the hydraulic system.

However, the hydraulic system of the present invention is not limited to this field and can be used for general purposes in the normal operation situation according to the unloading operation, for example, in the sea or on the ground for operational reasons.

It is an object of the present invention to provide a hydraulic system capable of lowering a large number of cargoes while raising empty hooks with no cargo connected in the middle without the use of electricity or other power sources. In addition, another object of the present invention is to be able to perform a fixed operation in accordance with each launch operation for the rapid and unobstructed launch of the so-called "MOB boat (lifesaving boat)".

A hydraulic system according to the present invention is additionally connected to a control valve via a second connecting conduit having a second back pressure valve on one side of the drive motor, wherein the first back pressure valve is independent of the second back pressure valve. The second back pressure valve allows free flow of pressure oil from the control valve to the drive motor, while preventing the flow of pressure oil from the drive motor to the control valve and prevents the control valve from being lifted. The drive motor is characterized in that it is connected to an oil-gas accumulator for supplying pressure oil for operation of the drive motor in the lift position.

According to this invention, it is possible for the winch to be operated only by the power stored in the oil-gas accumulator and used to lower the cargo. A drive motor is used as the pump to pump oil into the oil-gas accumulator during the descent operation. On the other hand, raising the ball hook is achieved by supplying oil stored in the oil-gas accumulator to the drive motor. In general, however, special processes can be carried out, for example, by pressure oil stored in addition to the lifting and lowering of the ball hook. The power is stored in the oil-gas accumulator when the heavy cargo is lowered, making it possible to use this stored power to raise the lighter cargo with the ball hook.

Referring to the present invention in more detail based on the accompanying drawings as follows.

1 shows a lifeboat 10 which is suspended from the hoisting wire 11 through the detachable hook holder mechanism 12. The hoisting wire 11 is wound around the drum 13 of the winch 14 for lifting and lowering. The winch is driven by the hydraulic drive motor 15 through a drive shaft 16 coupled to the reducer 17. Between the hydraulic drive motor 15 and the reducer 17, a spring-tangled brake 18 controlled by a pressure medium is inserted.

The hydraulic drive motor 15 constitutes a part of the hydraulic system controlled by the control valve 19. The control valve 19 is composed of a three-way main slide valve 20 for controlling the hydraulic drive motor 15 and a two-way slide valve 21 for controlling the brake 18.

The main slide valve 20 of the control valve 19 is controlled by the control handle 22, which controls the slide 20a of the main slide valve 20 in a neutral starting position, i. Two opposite outer positions II (position shifted to the left in FIG. 1) against the forces of the two springs 20b and 20c on both sides which can be moved to the central position I as shown in the figure and have the same resilience and It can be adjusted to move to position III (the position moved to the right side of FIG. 1). In the position II on the outside, the control valve 19 is adjusted to the pulling position for the operation of the hydraulic drive motor 15 which causes the drum 13 to be driven in the pulling direction, while in the position III on the outside, the control valve 19 ) Is adjusted to the lowered position for the operation of the hydraulic drive motor 15 to drive the drum 13 in the downward direction.

The control handle 22 is also used to control the slide valve 21 for controlling the brake 18. In this case, the control handle 22 is moved in the transverse direction with respect to the movement direction of the slide 20a, that is, in the movement direction of the slide 21a of the slide valve 21. In FIG. 1, the slide 21a is shown in the normal position A in which the brake 18 can be operated. The brake is released to the non-operational position by moving the slide 21a from the normal position A to the opposite outer position B against the force of the spring 21b, vertically downward in the drawing of FIG. 1 to slide the slide of the main slide valve 20. 20a is set so that the shaft 16 of the drum 13 can be rotated in the pulling direction or the falling direction determined.

The hydraulic drive motor 15 is connected to the first port 23 of the main slide valve 20 through the first connection conduit 24 into which the spring-tight back pressure valve 25 is inserted at one side thereof. The back pressure valve 25 allows the pressure medium to flow from the port 23 to the hydraulic drive motor 15, but prevents the pressure medium from flowing from the hydraulic drive motor 15 to the port 23. The back pressure valve 27 and the flow regulating valve 28 (which are pressure compensated) are arranged in the circulation conduit 26 arranged outside the back pressure valve 25 and extending between two points 26a and 26b of the connection conduit 24. Type throttle valve) is inserted. The pressure medium directed from the hydraulic drive motor 15 toward the port 23 can pass through the back pressure valve 27, whereby the flow rate is regulated through the flow control valve 28.

The hydraulic driving valve 15 is connected to the second port 29 of the main slide valve 20 through the second connecting conduit 30 in which the sequential valve 31 is inserted at the other side thereof. The back pressure valve 33 is inserted into the circulation conduit 32 arranged outside the sequential valve 31 and extending between the points 30a and 30b of the connection conduit 30. The back pressure valve 33 prevents the pressure medium from the port 29 from being transferred to the hydraulic drive motor 15 from the outside of the sequential valve 31 but flows from the hydraulic drive motor 15 to the port 29. It allows the pressure medium to flow out of the sequential valve (31).

At point 30c of the connecting conduit 30, the supply pipe 34 from the pressure medium tank 35 through a back pressure valve 36 which prevents the pressure medium from flowing back from the connecting conduit 30 into the pressure medium tank 35. ) Is connected. The pressure medium tank 35 is supplied with a pressure medium from the recovery oil tanks 36a and 36b through the filter 37. As mentioned above, the main slide valve 20 is provided with two ports 23 and 29 at one side thereof and three ports 38, 39 and 40 at the opposite side thereof.

The port 38 is connected to the oil chamber 43a of the oil-gas accumulator 43 through the conduit 41, the branch conduit 42, and the back pressure valve 44 of the branch conduit 42. The back pressure valve 44 allows the pressure oil to flow from the port 38 to the oil-gas accumulator 43 but prevents the pressure oil from being forced back into the port 38 from the oil-gas accumulator 43. do. The oil-gas accumulator 43 is provided with a gas chamber 43c connected to the gas flask 46 via a conduit 45 on the opposite side of the thin film 43b.

Port 39 is connected to branch conduit 42 via conduit 47 and branch conduit 48 at point 42a between check valve type back pressure valve 44 and oil-gas accumulator 43. . The back pressure valve 49 and the shutoff valve 50 are inserted into the branch conduit 48. The back pressure valve 49 allows the pressure oil to flow from the oil-gas accumulator 43 to the port 39 but prevents the pressure oil from flowing from the port 39 to the oil-gas accumulator 43. .

The port 40 is connected to the recovery oil tank 35a through the recovery conduit 51.

The branch conduit 52 is connected to the oil return conduit 35b from the main slide valve 20 of the control valve 19.

In the slide valve 21, the recovery conduit 54 extends from the first port 53a to the recovery oil tank 35b. At the start of the slide 21a the branch conduit 54 communicates with the conduit 55 connected to one side of the brake piston 56 of the brake housing 57 while the compression spring 58 opposes the brake piston. Act on the side.

The branch conduit 59 extends from the second port 53b to the connection 48b between the conduit 47 and the branch conduit 48 in the slide valve 21. In the outer position B (slide 21a moves downward in FIG. 1), a branch conduit 59 is connected to the conduit 55 so that pressure oil is released from the oil-gas accumulator 43 to the brake housing 58. Is supplied to the upper chamber of the piston 56, the compression spring 58 is compressed to release the braking force of the brake 18 and the hydraulic drive motor 15 (slide 21a is moved from the neutral position I) in the downward direction (position III) or in the pulling direction (position II). In the raised position II (raise lifeboat 10) and lowered position III (lower lifeboat 10) of slide 20a, branch conduit 59 is provided with oil through branch conduits 42, 48 and conduit 47. Pressure oil is supplied from the gas accumulator 43.

[Descent of cargo and lifeboats]

(1) During the lowering of the lifeboat (slide 21a is in the outer position III), pressure oil passes from the hydraulic drive motor 15 to the port 38 via the connecting conduit 24 and the port 23, and the conduit 41 And through the branch conduit 42 to the oil-gas accumulator 43.

(2) After the lifeboat 10 has been lowered to its descent height, the oil-gas accumulator will normally be fully filled.

(3) During the continuous descent of lifeboats, no additional oil-gas accumulators are charged. In fact, half of the power of the pressure oil generated in the descent operation can be stored in the oil-gas accumulator before the storage of additional power is stopped.

Conduit 41 from port 38 is connected to conduit 60 via connection 48a, where it is connected to port 62 of sequential valve 63 via connection 60a and branch conduit 61. do. On the other side, the sequential valve 63 is connected to the recovery oil tank 35c via the port 64 and the conduit 65. At the starting position of the sequential valve 63, as shown in FIG. 1 and fixed by the compression spring 66, the oil in the conduits 41 and 60 is discharged to the recovery oil tank 35c. The sequential valve 63 is controlled through the control chamber 68 by pilot pressure in the branch conduit 67 extending from the connection 26b of the circulation conduit 26. When the slide 63a of the sequential valve 63 moves to the right in FIG. 1 against the force of the spring 66, oil discharge to the recovery oil tank 35c through the sequential valve is blocked. The discharge valve 69 inserted between the connecting portion 60a and the recovery oil tank 35c in the branch conduit 70 is a pilot in the branch conduit 71 branched from the branch conduit 42 to one side of the discharge valve 69. Controlled by pressure. The discharge valve 69 remains unoccupied by the adjustable pressure from the compression spring 72, but when the high pilot pressure appears in the branch conduit 71 from the branch conduit 42, Open and the pressure oil from the port 38 is directed directly to the recovery oil tank 35a. The back pressure valve 44 is closed to prevent the pressure oil from flowing from the oil-gas accumulator to the conduit through the branch conduit 42.

The lowering operation then continues until the lifeboat reaches its lower position without further filling of the oil-gas accumulator 43.

A hydraulically actuated guide valve 73 is disposed outside the spring-loaded back pressure valve 25 in the connection conduit 24. The guide valve is connected to the first control chamber 74 connected to the connecting portion 26a of the connecting conduit 24 through the branch conduit 75 and to the connecting portion 26b of the connecting conduit 24 via the branch conduit 77. It has a second control chamber 76 on the opposite side to which it is connected. The guide valve 73 is placed at the starting position A by the compression spring 78. The first port 79 of the guiding valve 73 is connected to the connecting conduit 24 via the pressure reducing valve 81 and the connecting conduit 80, while the second port 82 of the guiding valve 73 is the conduit. It is connected to the recovery oil tank 35b via 83.

In starting position A, as shown in FIG. 1, the port 79 is connected to the blind conduit 85 at the port 84, while the port 82 is positioned with the conduit 87 at the port 86. It is connected to the cylinder 83, which adjusts the displacement of the hydraulic drive motor 15 at the starting position A. The hydraulic drive motor 15 is provided for the maximum displacement evaluated for the maximum amount of oil during the lowering and raising of the lifeboat 10 through the drum 13, that is, during the lifeboat applying traction to the hoisting wire 11. Adjusted.

[Impression of the ball hook]

When the ball hook is raised, that is, when the lifeboat is launched at sea and the hook is raised to its starting position to connect to the next lifeboat, it is desirable to adopt the same rotational speed at the minimum displacement, the displacement being maximum Decrease to 1/3 of the displacement (e.g. 29% using a relative maximum / minimum displacement of 3.4 / 1, for example). As a result, a very small amount of oil is used in the lifting of the ball hook compared to raising the hook to which the lifeboat (or cargo) is connected.

The displacement control from the maximum displacement (maximum displacement of 3.4) to the minimum displacement (minimum displacement of 1) is made under pressure drop through the regulating valve 28 and the blind conduit 85 is re-adjusted to the position B by the slide valve 73. Is connected to the recovery oil tank 35b through the conduit 83, while the conduit 80 through the pressure reducing valve 81 is connected to the position cylinder 88 via the conduit 87 and the spring 88a Reposition the position cylinder 88 against the force.

[Descent of the ball hook]

When descending the ball hook a reduced speed is used compared to the speed at which the ball hook is raised. In the starting position, the oil-gas accumulator 43 is filled and the slide 20a of the control valve 19 is moved to the right side of FIG. 1 to give the left sign (falling position III). Since the pressure oil is supplied from the oil-gas accumulator 43 to the hydraulic drive motor 15, the hydraulic drive motor is driven as a normal winch. Since the hook of the hoisting wire 11 does not have a load because there is no load, the hydraulic drive motor is not driven as a pump. Thus, assuming that the amount of oil supplied from the oil-gas accumulator is smaller than the adjustment value for the amount through the flow regulating valve 28 in the downward direction between the hydraulic drive motor 15 and the flow regulating valve 28. No significant drive pressure is required. At low oil pressure of the connecting conduit 30, the sequential valve 31 of the connecting conduit 30 and the sequential valve 63 of the connecting conduit 60-65 will open and the pressure oil will be opened to the main of the control valve 19. From the slide valve 20 can be supplied to the hydraulic drive motor 15 through the sequential valve 31 of the port 39, 29 and the connecting conduit 30, while the recovery oil is supplied from the hydraulic drive motor 15 It is conveyed to the recovery oil tank 35 through the ports 23, 38 and the conduits 41, 60, 61 and 65 of the main slide valve 20.

FIG. 2 corresponds to the winch 14 of FIG. 1 and is arranged on the opposite side of the drum 13, the brake 18 and the winch housing 14a arranged on one side of the winch housing 14a and the reducer 17. A winch with a hydraulic drive motor 15 (or pump) is shown. Part of the hoisting wire 11 is wound around the drum 13.

3 to 5, the crane 90 launches the so-called "MOB boat" (lifeboat) 10a from the non-operational position outside the deck end 91 of the platform deck 92. It is shown to be in a state. The boat 10a is fixed in the inoperative position shown by a pair of easily detachable ropes 89. In addition, a separate safety line 93 is used which is fixed between the outer end of the crane 90 and the boat 10a, wherein the safety line 93 is connected to the boat 10a via the hook 94. It is fixed together with the hoisting line hook 95 of the fixing ring 96 hangs on the manual detachable hook holder mechanism 12 fixed to the top of the). After removing the rope 89 and the safety line 93, the boat 10a operates the control valve 19 of the winch to prepare the water. If necessary, the control valve 19 can be operated by remote control from the boat. After the boat 10a is launched at sea, the hook holder mechanism 12 can be released by hand to separate it from the hoisting wire 11. For example, a separate crane (not shown) may be used if the boat is pulled back to the starting position of the platform deck 92 after it has been used.

The crane 90 has a winch 14 mounted on its lower end, and an oil-gas accumulator 43 is fixed to one side 90a of the crane. A control valve 19 with a control handle 22 is shown disposed between the oil-gas accumulator 43 and the hydraulic drive motor 15 of the winch. In addition, a manual pump 99 having a separate oil tank 98 and a pump handle 99a is provided. This pump 99 is coupled to the hydraulic drive motor 15 can be used to manually pull up the hoisting wire 11 to which the ball hook is connected if necessary in case of emergency.

For example, if several lifeboats are to be launched one after the other in the same launching station, a davit arrangement or crane arrangement designed for this purpose may be used instead of the crane shown and the lifeboats may be It can be rotated from the non-operating position of the platform deck to the launch position outside the deck. If necessary, this rotational movement operation may be performed by the force of the pressure oil stored in the oil-gas accumulator 43 after the preceding launching operation.

Claims (6)

Hydraulic system used to lower cargo such as lifeboat 10 and to lift cargo or ball hooks by hydraulic power through winch 14 having control valve 19 and hydraulic drive motor 15 by gravity. While one side of the driving motor 15 prevents pressure oil from flowing from the control valve 19 to the hydraulic drive motor 15, the pressure oil flows from the hydraulic drive motor 15 to the control valve 19. It is connected to the control valve 19 via conduits 24 and 26 with a first back pressure valve 27 which permits, and the cargo hangs on the hook of the hoisting wire 11 and the control valve 19 is in the lowered position (III). In the hydraulic system for the winch in which the hydraulic drive motor 15 is connected to the oil-gas accumulator 43 for the storage of the pressure oil while the winch 14 is operating in the downward direction in the above-mentioned. The actuating side of 15) has a second back pressure valve 25 It is connected to the control valve 19 through the first connection conduit 24, the first back pressure valve 27 is coupled to separate conduits (24, 26) on the outside of the second back pressure valve (25), The second back pressure valve 25 allows the free flow of pressure oil from the control valve 19 to the hydraulic drive motor 15 while the pressure oil flows from the hydraulic drive motor 15 to the control valve 19. To the oil-gas accumulator 43 which supplies a pressure oil for the operation of the hydraulic drive motor 15 in the raised position. Hydraulic system for winches characterized in that connected. 2. The hydraulic drive motor (15) of claim 1, wherein the control valve (19) is in the lowered position (III) between the control valve (19) and the first back pressure valve (27) in separate conduits (24, 26). Hydraulic system for a winch, characterized in that the flow control valve for regulating the pressure oil flowing from the control valve 19 side. 3. The hydraulic drive motor (15) according to claim 1 or 2, wherein the hydraulic drive motor (15) is adjustable to a first position having a maximum displacement for use in the descending process and a second position having a minimum displacement for use in the pulling process. The position cylinder 88 is present in the conduits 24 and 26 between the hydraulic drive motor 15 and the control valve 19 as a means by which the displacement of the hydraulic drive motor 15 can be readjusted by the valve 73. And controlled by a pressure oil controlled by a pressure drop through the back pressure valves (25, 27) of the conduit (24). 2. The oil-gas accumulator (43) according to claim 1, wherein the oil-gas accumulator (43) allows pressure oil to flow from the control valve (19) to the oil-gas accumulator (43). It is connected to the control valve 19 via third conduits 41 and 42 including a third back pressure valve 44 which prevents flow to the control valve 19 side, and the oil-gas accumulator 42 is cut off. A fourth oil which allows pressure oil to flow from the valve 50 and the oil-gas accumulator 43 to the control valve 19 but prevents it from flowing from the control valve 19 to the oil-gas accumulator 43. Hydraulic system for a winch, characterized in that connected to the control valve (19) through a fourth conduit (42, 48, 47) including a back pressure valve (49). 5. Oil-gas according to claim 4, wherein the normally closed discharge valve (69) directs excess pressure oil from the control valve (19) to the recovery oil tank (35) outside the third back pressure valve (44). In the conduit 71 which is opened in the fully charged state of the accumulator 43 and the discharge valve 69 extends from the conduit 42 between the oil-gas accumulator 43 and the third back pressure valve 44. Hydraulic system for winches characterized by controlled high oil pressure. 5. The control valve (19) and recovery oil tank (35c) of claim 4, inserted into conduits (41, 60-65) between the control valve (19) and recovery oil tank (35c) and by means of a compression spring (66). The sequential valve 63, which is adjusted to an open position between the valves, is controlled by the oil pressure existing between the hydraulic drive motor 15 and the back pressure valves 25 and 27 of the first or second conduits 24; 24 and 26. Hydraulic system for a winch, characterized in that readjusted to the closed position by the control chamber (68).