A control method for stopping and quickly releasing a winch rope

Abstract

The present invention provides a control method for stopping rope reeling and quickly releasing the rope of a winch, and the specific steps include: if quick rope releasing is required; the first control reversing valve is reversed so that the A end is connected to the P end; the oil tank outputs hydraulic oil to the control end of the first control switching valve through the first control reversing valve, drives the first control switching valve to reverse and connect the first port and the second port; the oil circuit between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, as well as the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected; the oil tank continues to output hydraulic oil to the oil inlet pipeline; the hydraulic oil flows to the oil return pipeline through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipeline through the motor to realize circulation, thereby driving the winch to quickly release the rope; the control method is simple and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of winch control systems, and in particular to a method for controlling a winch to stop paying out a rope and to quickly pay out a rope. Background Art

[0002] Lifting hydraulic systems are widely used in various lifting equipment. Existing hydraulic systems are typically only capable of lifting and lowering cargo. However, when a fixed platform crane is engaged in a lifting operation with a supply vessel, the system must reel in and out the rope, and the rope must be released after a certain amount of release. Furthermore, if the hook of the fixed platform crane accidentally hooks onto the supply vessel during the reeling process, and the supply vessel begins to move or becomes uncontrollable without being aware of the situation, if the rope cannot be quickly released from the lifting equipment, the crane or the entire platform could be dragged down by the supply vessel, posing a serious safety hazard.

[0003] A lifting hydraulic system is disclosed in the patent document with Chinese patent application number 202110758060.X and publication date 2021.10.08, including a motor, a balancing valve, a first reversing valve, a first shuttle valve, a second reversing valve, a first check valve, a second shuttle valve, an electromagnetic reversing valve, a winch assembly, a first working oil port of the system and a second working oil port of the system. The first working oil port of the system is connected to the second working oil port of the system through the balancing valve and the motor in sequence, and the first shuttle valve is connected to the winch assembly through the second reversing valve and the second shuttle valve in sequence. The first reversing valve is connected to the 3MPa constant pressure oil source through the electromagnetic reversing valve. When an emergency occurs, this design enables the coil of the electromagnetic reversing valve to be energized to connect the control oil port of the first reversing valve to the 3MPa constant pressure oil source, thereby allowing the motor to rotate freely under the traction of the load, and at the same time the rope pressing device opens to realize automatic rope abandonment.

[0004] However, the prior art of this document relies on an external rope-pressing device to control the wire rope, that is, it cannot be controlled directly through the hydraulic oil circuit. In this way, in an actual emergency situation, the staff not only needs to control the hydraulic system, but also needs to control the rope-pressing device to abandon the rope, which makes the operation complicated and easy to miss the best time. At the same time, if the control is performed through the hydraulic oil circuit, it is necessary to control the rope-releasing stop operation and the rope-releasing operation quickly under normal circumstances, which makes the entire oil circuit complicated, and the control through two oil circuits makes the entire control method complicated. Summary of the Invention

[0005] The present invention provides a control method for stopping and quickly releasing the rope of a winch, which realizes the switching of the normal rope releasing and stopping rope releasing and the quick rope releasing operation during the rope collecting process through a shuttle valve. The control method is simple, and the rope can be abandoned by controlling the circulation flow of the hydraulic oil circuit at the same time. In addition, by providing multiple leakage oil circuits, the hydraulic oil can be quickly discharged in the oil circuit in an emergency, so that the winch can be controlled to quickly loosen the wire rope to realize emergency rope abandonment.

[0006] To achieve the above-mentioned object, the technical solution of the present invention is: a method for controlling the stop and quick release of a winch rope, which realizes the quick release function in the rope release state and the stop release function in the normal rope release state through the winch control system. The specific steps include:

[0007] (1) When the rope retraction function is performed in the rope retraction state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope retraction operation.

[0008] (15) If you need to release the rope quickly.

[0009] (16) The first control reversing valve is switched so that the A end is connected to the P end.

[0010] (17) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to reverse and connect the first port and the second port.

[0011] (18) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank.

[0012] (19) The oil circuit between the oil inlet pipe and the pilot relief valve and the oil return pipe, and the oil circuit between the oil inlet pipe and the second pilot relief valve and the oil return pipe are connected.

[0013] (110) The oil tank flows into the second control end of the first switch valve through the first shuttle valve, and the first switch valve switches and controls the first port and the second port to be disconnected.

[0014] (111) The hydraulic oil cannot flow back to the oil tank from the return oil pipe, but flows to the return oil pipe through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly release the rope.

[0015] (2) If it is necessary to stop releasing the rope during the rope releasing state, the first control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the second control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

[0016] The winch control system includes an oil tank, a pilot-operated relief valve, a first switch valve, a first control valve group, a first shuttle valve and a motor. The oil tank is connected to the oil inlet pipe, and the oil tank is connected to the oil tank through the first switch valve. A pilot-operated relief valve and a second pilot-operated relief valve are provided between the oil inlet pipe and the oil return pipe. The oil inlet end of the pilot-operated relief valve is connected to the oil inlet pipe, and the oil outlet end of the pilot-operated relief valve is connected to the oil return pipe; the oil inlet end of the second pilot-operated relief valve is connected to the oil inlet pipe, and the oil outlet end of the pilot-operated relief valve is connected to the oil return pipe.

[0017] The first control valve group includes a first control switch valve, a first control reversing valve and a first control overflow valve. The output end of the first control reversing valve is connected to the second port of the first shuttle valve and the control end of the first control switch valve. The input end of the first control reversing valve is connected to the oil tank. The input end of the first control switch valve is connected to the control oil circuit of the pilot overflow valve and the control oil circuit of the second pilot overflow valve. The output end of the first control reversing valve is connected to the oil tank through the first control overflow valve.

[0018] The oil pump of described oil tank is to be kept in the oil tank of oil pumping, and oil pump is put into oil pumping line by oil pump of described oil pumping line. The control first port and the second port are disconnected, thereby preventing the hydraulic oil from flowing back to the oil tank from the return oil pipe but flowing to the second port of the motor; at the same time, the first control reversing valve is reversed so that the A end is connected to the P end, and the oil tank outputs the hydraulic oil to the control end of the first control switching valve through the first control reversing valve, so that the first control switching valve is reversed and connected to the first port and the second port of the first control switching valve, thereby causing the control hydraulic oil of the control oil circuit of the pilot relief valve to flow back to the oil tank through the first control relief valve to relieve pressure, thereby reducing the regulating pressure of the pilot relief valve. Since the oil pressure in the oil inlet pipe is greater than the regulating pressure of the pilot relief valve, the pilot relief valve is driven to open, thereby causing the hydraulic oil in the oil inlet pipe to pass through the pilot relief valve. After the oil pressure in the oil pump is increased, the oil pressure in the oil pumping line will be increased, and the oil pressure in the oil pumping line will be increased. After the oil pressure in the oil pumping line is increased, the oil pressure in the oil pumping line will be increased, and the oil pressure in the oil pumping line will be increased. After the jack is in the oil, the oil in the oil tank is turned off, and the oil in the oil return line is turned off, and the oil inlet and outlet pipes are turned off. When the jack is in the oil, the oil in the oil return line is turned off, and the oil inlet and outlet pipes are turned off. When the jack is in the oil, the oil in the oil return line is turned off, and the oil in the oil return line is turned off. When the jack is in the oil, the oil in the oil return line is turned off, and the oil in the oil return line is turned off. When the jack is in the oil, the oil in the oil return line is turned off, and the oil in the oil return line is turned off. When the jack is in the oil, the oil in the oil return line is turned off, and the oil in the oil return line is turned off, and the oil in the oil return line is turned off. When the jack is in the oil, the oil in the oil

[0019] Furthermore, a second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, the first port of the second switch valve is connected to the oil inlet pipeline, and the second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

[0020] The above arrangement, by providing the second switch valve, enables the oil circuit between the oil inlet pipe and the pilot-operated relief valve to be opened only when the pilot-operated relief valve is needed, thereby facilitating control of the hydraulic system.

[0021] Furthermore, a balancing valve group is provided on the oil inlet pipeline, and the balancing valve group includes a balancing overflow valve and a balancing check valve. The oil inlet end of the balancing overflow valve is connected to the first port of the motor through the oil inlet pipeline, and the oil outlet end of the balancing overflow valve is connected to the hydraulic pump through the oil inlet pipeline. The oil inlet end of the balancing check valve is connected to the oil outlet end of the balancing overflow valve, and the oil outlet end of the balancing check valve is connected to the oil inlet end of the balancing overflow valve.

[0022] The above setting, by setting a balancing valve group, makes the hydraulic oil output of the oil inlet pipeline stable.

[0023] Furthermore, a brake valve is provided on the motor, and the control end of the brake valve is connected to the oil inlet pipe and the oil outlet pipe through the brake reversing valve. The P end of the brake reversing valve is connected to the oil tank, and the A end of the brake reversing valve is connected to the control end of the brake valve. The control end of the brake reversing valve is connected to the oil inlet pipe and the oil outlet pipe.

[0024] The above setting connects the oil inlet pipe and the oil outlet pipe through the control end of the brake valve reversing valve. When the winch is to be started, the hydraulic oil in the oil inlet pipe and the oil outlet pipe flows to the control end of the brake reversing valve and controls the reversal of the brake reversing valve so that the A end is connected to the P end, so that the hydraulic oil output from the oil tank flows to the control end of the brake valve, thereby driving the brake valve to open, facilitating the rotation of the motor.

[0025] Furthermore, a spring is provided on the second control end of the first switch valve, and the hydraulic oil pressure at the second control end plus the pressure of the spring is greater than the hydraulic oil pressure at the first control end of the first switch valve.

[0026] The above arrangement, by setting a spring, ensures that when the first switch valve is to be closed, the hydraulic oil pressure flowing from the oil tank to the second control end of the first switch valve plus the elastic force of the spring overcomes the hydraulic oil pressure at the first control end of the first switch valve, thereby driving the first switch valve to close, so that the hydraulic oil cannot flow back to the oil tank through the return oil pipe.

[0027] Furthermore, the P end and T end of the first control reversing valve are connected to the oil tank, the A end of the first control reversing valve is connected to the control end of the first control switch valve, the first port of the first control switch valve is connected to the oil tank through the first control overflow valve, the first port of the first shuttle valve is connected to the A end of the first control reversing valve, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the second control end of the first switch valve.

[0028] In the above arrangement, by providing the first shuttle valve between the second control terminal of the first switch valve and terminal A of the first control reversing valve, the hydraulic oil flowing through the first control reversing valve to the second control terminal of the first switch valve does not conflict with the hydraulic oil flowing from the oil tank to the second control terminal of the first switch valve.

[0029] Furthermore, step (1) specifically includes: (11) the oil tank supplies oil to the oil inlet pipeline through the hydraulic pump.

[0030] (12) The hydraulic oil flows through the oil inlet pipe to the first port of the motor.

[0031] (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate.

[0032] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and flows back to the oil tank through the oil return pipe to realize circulation and drive the motor to rotate.

[0033] The above settings facilitate the normal rope collection state.

[0034] Furthermore, a third switch valve is provided between the oil inlet end of the second pilot-operated relief valve and the oil inlet pipeline, wherein a first port of the third switch valve is connected to the oil inlet pipeline, and a second port of the third switch valve is connected to the oil inlet end of the pilot-operated relief valve.

[0035] The above arrangement, by providing the third switch valve, enables the oil circuit between the oil inlet pipeline and the second pilot-operated relief valve to be opened only when the second pilot-operated relief valve is needed, thereby facilitating control of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the hydraulic system of the present invention.

[0037] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0038] Figure 3 Flowchart of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1-Figure 2 As shown, a control method for stopping and quickly releasing the rope of a winch is provided, wherein the winch control system realizes the function of quickly releasing the rope in the rope releasing state and the function of stopping releasing the rope in the normal rope releasing state. The winch control system includes an oil tank 1, a pilot relief valve 2, a first switch valve 3, a motor 4, a second pilot relief valve and a first control valve group. A hydraulic pump (not shown in the figure) is provided on the oil tank 1. The hydraulic pump is connected to the first port 41 of the motor 4 through an oil inlet pipe 11, and the second port 42 of the motor 4 is connected to the oil tank 1 through an oil return pipe 12. A pilot relief valve 2 is provided between the oil inlet pipe 11 and the oil return pipe 12. The oil inlet end of the pilot relief valve 2 is connected to the oil inlet pipe 11, and the oil outlet end of the pilot relief valve 2 is connected to the oil return pipe 12; A first switch valve 3 is provided on the return oil pipeline 12, the first port of the first switch valve 3 is connected to the second port 42 of the motor 4 through the return oil pipeline 12, the second port of the first switch valve 3 is connected to the oil tank 1 through the return oil pipeline 12, the first control end 31 of the first switch valve 3 is connected to the first port and the second port of the first switch valve 3, the second control end 32 of the first switch valve 3 is connected to the oil tank, the first control end 31 of the first switch valve 3 controls the first port and the second port of the first switch valve 3 to be connected, the second control end 32 of the first switch valve 3 controls the first port and the second port of the first switch valve 3 to be disconnected, the oil inlet end of the second pilot overflow valve 6 is connected to the oil inlet pipeline 11, and the oil outlet end of the pilot overflow valve 6 is connected to the return oil pipeline 12.

[0041] The first control valve group includes a first control switch valve 81, a first control reversing valve 82 and a first control overflow valve 83. The P end and T end of the first control reversing valve 82 are connected to the oil tank 1, and the A end of the first control reversing valve 82 is connected to the control end 811 of the first control switch valve 81. The first port of the first control switch valve 81 is connected to the oil tank 1 through the first control overflow valve 83. The second port of the first control switch valve 81 is connected to the control oil circuit 20 of the pilot overflow valve 2 and the control oil circuit 60 of the second pilot overflow valve 6. The overflow pressure of the first control overflow valve 83 is less than the control pressure of the control oil circuits of the pilot overflow valve 2 and the second pilot overflow valve 6.

[0042] In this embodiment, the control end 821 of the first control reversing valve is connected to a control button (not shown) in the crane cab via an external circuit. In an emergency, a worker in the cab presses the control button to activate the first control reversing valve to achieve reversal. A first shuttle valve 84 is provided between the second control end 32 of the first on-off valve 3 and end A of the first control reversing valve 82. A first port 841 of the first shuttle valve 84 is connected to end A of the first control reversing valve 82, a second port 842 of the first shuttle valve 84 is connected to the fuel tank 1, and a third port 843 of the first shuttle valve 84 is connected to the second control end 32 of the first on-off valve 3. By providing the first shuttle valve 84 between the second control end 32 of the first on-off valve 3 and end A of the first control reversing valve 82, the hydraulic oil flowing from the fuel tank 1 to the second control end 32 of the first on-off valve 3 does not conflict with each other.

[0043] A second on-off valve 21 is provided between the oil inlet end of the pilot-operated relief valve 2 and the oil inlet pipeline. A first port of the second on-off valve 21 is connected to the oil inlet pipeline 11, and a second port of the second on-off valve 21 is connected to the oil inlet end of the pilot-operated relief valve 2. The provision of the second on-off valve 21 allows the oil circuit between the oil inlet pipeline 11 and the pilot-operated relief valve 2 to be opened only when the pilot-operated relief valve 2 is needed, thereby facilitating control of the hydraulic system.

[0044] A third on-off valve 61 is provided between the oil inlet end of the second pilot-operated relief valve 6 and the oil inlet pipeline 11. A first port of the third on-off valve 61 is connected to the oil inlet pipeline 11, and a second port of the third on-off valve 61 is connected to the oil inlet end of the pilot-operated relief valve 6. The provision of the third on-off valve 61 allows the oil passage between the oil inlet pipeline 11 and the second pilot-operated relief valve 6 to be opened only when the second pilot-operated relief valve 6 is needed, thereby facilitating control of the hydraulic system.

[0045] A balancing valve assembly 5 is provided on the oil inlet pipeline 11. The balancing valve assembly 5 includes a balancing relief valve 51 and a balancing check valve 52. The oil inlet end of the balancing relief valve 51 is connected to the first port 41 of the motor 4 via the oil inlet pipeline 11, and the oil outlet end of the balancing relief valve 51 is connected to the hydraulic pump via the oil inlet pipeline 11. The oil inlet end of the balancing check valve 52 is connected to the oil outlet end of the balancing relief valve 51, and the oil outlet end of the balancing check valve 52 is connected to the oil inlet end of the balancing relief valve 51. The provision of the balancing valve assembly 5 ensures a stable output of hydraulic oil from the oil inlet pipeline 11.

[0046] like Figure 1As shown, a brake valve 43 is also provided on the motor 4. The control end of the brake valve 43 is connected to the oil inlet and oil outlet pipes via a brake reversing valve 44. The P end of the brake reversing valve 44 is connected to the oil tank, the A end of the brake reversing valve is connected to the control end of the brake valve, and the control end K of the brake reversing valve 44 is connected to the oil inlet pipe 11 and the oil outlet pipe 12. The control end K of the brake valve reversing valve 44 is connected to the oil inlet pipe 11 and the oil outlet pipe 12. When the winch is to be started, the hydraulic oil in the oil inlet pipe 11 and the oil outlet pipe 12 flows to the control end of the brake reversing valve 44, and the brake reversing valve 44 is controlled to reverse so that the A end is connected to the P end, thereby causing the hydraulic oil output from the oil tank 1 to flow to the control end of the brake valve 43, thereby driving the brake valve 43 to open, facilitating the rotation of the motor 4.

[0047] like Figure 2 As shown, a spring 33 is further provided at the second control end 32 of the first switching valve 3. The hydraulic oil pressure at the second control end 32 plus the pressure of the spring 33 is greater than the hydraulic oil pressure at the first control end 31 of the first switching valve 3. The provision of the spring 33 ensures that when the first switching valve 3 is closed, the hydraulic oil pressure flowing from the oil tank 1 into the second control end 32 of the first switching valve 3 plus the elastic force of the spring 33 overcomes the hydraulic oil pressure at the first control end 31 of the first switching valve 3, thereby driving the first switching valve 3 to close and preventing the hydraulic oil from flowing back to the oil tank through the oil return pipe 12.

[0048] like Figure 3 As shown, a method for controlling a winch to stop and quickly release a rope comprises the following steps:

[0049] (1) When the rope retraction function is performed in the rope retraction state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope retraction operation.

[0050] (11) The oil tank supplies oil to the oil inlet pipe through the hydraulic pump.

[0051] (12) The hydraulic oil flows through the oil inlet pipe to the first port of the motor.

[0052] (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate.

[0053] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and flows back to the oil tank through the oil return pipe to realize circulation and drive the motor to rotate.

[0054] (15) If you need to release the rope quickly.

[0055] (16) The first control reversing valve is switched so that the A end is connected to the P end.

[0056] (17) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to reverse and connect the first port and the second port.

[0057] (18) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank.

[0058] (19) The oil circuit between the oil inlet pipe and the pilot relief valve and the oil return pipe, and the oil circuit between the oil inlet pipe and the second pilot relief valve and the oil return pipe are connected.

[0059] (110) The oil tank supplies oil to the second control end of the first switch valve, and the first switch valve switches and controls the first port and the second port to be disconnected.

[0060] Step (110) specifically includes: the hydraulic oil flowing to the first switch valve simultaneously flows to the first port of the first shuttle valve, driving the first port and the third port of the first shuttle valve to be connected, and the hydraulic oil flows to the second control end of the first switch valve through the first shuttle valve, thereby driving the first switch valve to switch and controlling the first port and the second port to be disconnected.

[0061] (111) The hydraulic oil cannot flow back to the tank from the return oil pipe but flows to the second port of the motor.

[0062] (112) The oil tank continues to output hydraulic oil to the oil inlet pipe.

[0063] (113) The hydraulic oil flows through the pilot relief valve and the second pilot relief valve to the return oil pipe and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly release the rope.

[0064] (2) If it is necessary to stop releasing the rope during the rope releasing state, the first control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the second control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

[0065] In the normal rope-releasing state, no oil enters the control end of the first switch valve 3, so that oil enters the first control end 31 of the first switch valve 3, thereby making the first switch valve 3 conductive. Since the first control switch valve is disconnected, the hydraulic oil of the oil tank 1 cannot enter through the first port of the first shuttle valve, and can only enter the control end of the first switch valve 3 through the second port and the third port, so that the first switch valve 3 is closed. Therefore, the hydraulic oil of the oil tank 1 enters the inlet pipe through the motor through the return oil pipe and then enters the oil tank to realize rope releasing. When it is necessary to stop rope releasing, oil is supplied to the second port of the first shuttle valve, so that the oil enters the second control end through the second port and the third port, thereby disconnecting the first switch valve 3, thereby disconnecting the rope-releasing circuit and stopping rope releasing.

[0066] The working principle of the present invention is as follows: when the rope is being reeled in, the hydraulic oil output by the oil tank 1 enters the oil inlet pipe 11 through the balanced one-way valve 52 and then passes through the motor 4 and the return oil pipe 12 to enter the oil tank 1 for circulation to realize the rope reeling operation. At the same time, a first switch valve 3 is provided on the return oil pipe 12. When the motor 4 rotates normally, the oil tank 1 delivers hydraulic oil to the motor 4 through the oil inlet pipe 11 and flows into the return oil pipe 12 through the motor 4. The hydraulic oil in the return oil pipe 12 flows to the first control end 31 of the first switch valve 3, thereby driving the first switch valve 3 to reverse and connect the first port and the second port, thereby making the return oil pipe The return pipe 12 is connected to the oil tank, and the hydraulic oil can flow back to the oil tank 1 to realize circulation. When the weight is lifted by mistake, it is in the rope-retracting state, and the oil tank 1 supplies oil to the second control end 32 of the first switch valve 3, driving the first switch valve 3 to reverse and control the first port and the second port to be disconnected, thereby making it impossible for the hydraulic oil to flow back to the oil tank 1 from the return pipe 12 but to flow to the second port 42 of the motor 4; at the same time, the first control reversing valve 82 is reversed so that the A end is connected to the P end, and the oil tank outputs the hydraulic oil to the control end 811 of the first control switch valve 81 through the first control reversing valve 82, so that the first control switch valve 81 is reversed and The first port and the second port of the first control switch valve 81 are connected, so that the control hydraulic oil of the control oil circuit 20 of the pilot relief valve 2 is depressurized through the first control relief valve 83 and flows back to the oil tank, thereby reducing the adjustment pressure of the pilot relief valve 2. Since the oil pressure in the oil inlet pipe 11 is greater than the adjustment pressure of the pilot relief valve 2, the pilot relief valve 2 is driven to open, thereby causing the hydraulic oil in the oil inlet pipe 11 to be depressurized through the pilot relief valve 2 to the return oil pipe 12, thereby increasing the oil pressure on the return oil pipe 12 and making the oil pressure at the end connected to the motor 4 and the return oil pipe 12 greater than the oil pressure at the end connected to the motor and the inlet pipe. The oil pressure at one end connected to the oil pipeline 11 is increased, and due to the overflow effect of the pilot-operated relief valve 2, a circulation loop is formed between the oil inlet pipeline, the oil return pipeline and the motor through the pilot-operated relief valve. The oil tank continues to output hydraulic oil to the oil inlet pipeline, thereby increasing the hydraulic oil in the circulation loop, thereby increasing the pressure difference at both ends of the motor 4, and then increasing the speed of the motor 4 to achieve rapid rope release. At the same time, by providing a second pilot-operated relief valve, when it is necessary to increase the circulation speed of the hydraulic oil, the second pilot-operated relief valve is controlled to open, so that the oil circuit between the oil inlet pipeline, the second pilot relief valve and the oil return pipeline is connected;The hydraulic oil flows through the pilot relief valve and the second pilot relief valve to the return oil pipeline, and then back to the oil inlet pipeline through the motor, thus achieving circulation. By adding multiple connecting oil paths to the oil inlet and outlet pipelines, the circulation of the hydraulic oil is accelerated, thereby speeding up the rope release of the winch. When it is necessary to stop the rope release during the rope release state, the first control switch valve is controlled to open, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, thereby opening the first switch valve and preventing the hydraulic oil in the return oil pipeline from being disconnected from the oil tank. The three ports of the first shuttle valve can be used to realize emergency rope release during rope retraction and stop rope release during rope release, and the operation method is simple.

Claims

1. A method for controlling the stop and quick release of a winch rope, which realizes the quick release function in the rope release state and the stop release function in the normal rope release state through the winch control system, characterized in that: The specific steps include: (1) When the quick rope retraction function is performed in the rope retraction state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope retraction operation; (15) If you need to release the rope quickly; (16) The first control reversing valve is switched so that the A end is connected to the P end; (17) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to reverse and connect the first port and the second port; (18) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank; (19) The oil circuit between the oil inlet pipe and the pilot relief valve and the oil return pipe, and the oil circuit between the oil inlet pipe and the second pilot relief valve and the oil return pipe are connected; (110) The oil tank flows into the second control end of the first switch valve through the first shuttle valve, and the first switch valve switches and controls the first port and the second port to be disconnected; (111) The hydraulic oil cannot flow back to the oil tank from the return oil pipe. Instead, it flows through the pilot relief valve and the second pilot relief valve to the return oil pipe and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly release the rope; (2) If it is necessary to stop releasing the rope in the rope releasing state, the first control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank; The winch control system includes a fuel tank, a pilot-operated relief valve, a first switch valve, a first control valve group, a first shuttle valve, and a motor. The fuel tank is connected to an oil inlet pipeline, and the fuel tank is connected to an oil return pipeline via the first switch valve. A pilot-operated relief valve and a second pilot-operated relief valve are provided between the oil inlet pipeline and the oil return pipeline. The oil inlet end of the pilot-operated relief valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot-operated relief valve is connected to the oil return pipeline; the oil inlet end of the second pilot-operated relief valve is connected to the oil inlet pipeline, and the oil outlet end of the second pilot-operated relief valve is connected to the oil return pipeline. The first control valve group includes a first control switch valve, a first control reversing valve and a first control overflow valve. The output end of the first control reversing valve is connected to the second port of the first shuttle valve and the control end of the first control switch valve. The input end of the first control reversing valve is connected to the oil tank. The input end of the first control switch valve is connected to the control oil circuit of the pilot overflow valve and the control oil circuit of the second pilot overflow valve. The output end of the first control reversing valve is connected to the oil tank through the first control overflow valve.

2. A winch stop and fast rope release control method according to claim 1, characterized in that: A second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, wherein a first port of the second switch valve is connected to the oil inlet pipeline, and a second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

3. A method for controlling a winch to stop and quickly release a rope according to claim 1, characterized in that: A balancing valve group is provided on the oil inlet pipeline, and the balancing valve group includes a balancing overflow valve and a balancing check valve. The oil inlet end of the balancing overflow valve is connected to the first port of the motor through the oil inlet pipeline, and the oil outlet end of the balancing overflow valve is connected to the hydraulic pump through the oil inlet pipeline. The oil inlet end of the balancing check valve is connected to the oil outlet end of the balancing overflow valve, and the oil outlet end of the balancing check valve is connected to the oil inlet end of the balancing overflow valve.

4. A method for controlling a winch to stop and quickly release a rope according to claim 1, characterized in that: A brake valve is also provided on the motor. The control end of the brake valve is connected to the oil inlet pipeline and the oil outlet pipeline through the brake reversing valve. The P end of the brake reversing valve is connected to the oil tank. The A end of the brake reversing valve is connected to the control end of the brake valve. The control end of the brake reversing valve is connected to the oil inlet pipeline and the oil outlet pipeline.

5. A method for controlling a winch to stop and quickly release a rope according to claim 1, characterized in that: A spring is further provided on the second control end of the first switch valve, and the hydraulic oil pressure at the second control end plus the pressure of the spring is greater than the hydraulic oil pressure at the first control end of the first switch valve.

6. A method for controlling a winch to stop and quickly release a rope according to claim 1, characterized in that: The P end and T end of the first control reversing valve are connected to the oil tank, the A end of the first control reversing valve is connected to the control end of the first control switch valve, the first port of the first control switch valve is connected to the oil tank through the first control overflow valve, the first port of the first shuttle valve is connected to the A end of the first control reversing valve, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the second control end of the first switch valve.

7. A method for controlling a winch to stop and quickly release a rope according to claim 6, characterized in that: Step (1) specifically includes: (11) The oil tank supplies oil to the oil inlet pipe through the hydraulic pump; (12) The hydraulic oil flows through the oil inlet pipe to the first port of the motor; (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate; (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and flows back to the oil tank through the oil return pipe to realize circulation and drive the motor to rotate.

8. A method for controlling a winch to stop and quickly release a rope according to claim 1, characterized in that: A third switch valve is provided between the oil inlet end of the second pilot relief valve and the oil inlet pipeline, wherein a first port of the third switch valve is connected to the oil inlet pipeline, and a second port of the third switch valve is connected to the oil inlet end of the pilot relief valve.

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