Control method for stopping rope releasing and quickly releasing rope of winch

Abstract

The invention provides a control method for stopping rope winding and quickly releasing a rope of a winch. The control method comprises the following specific steps: quickly releasing the rope if the rope needs to be released; the first control reversing valve reverses to enable the A end to be communicated with the P end; the oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, drives the first control switch valve to reverse and communicates with the first port and the second port. An oil path between the oil inlet pipeline and the pilot-operated overflow valve and the oil return pipeline is communicated with an oil path between the oil inlet pipeline and the second pilot-operated overflow valve and the oil return pipeline; the oil tank continuously outputs hydraulic oil to the oil inlet pipeline; hydraulic oil flows to the oil return pipeline through the pilot-operated overflow valve and the second pilot-operated overflow valve and then flows back to the oil inlet pipeline through the motor, so that circulation is realized, and the winch is driven to release a rope quickly; the control method is simple and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of winch control systems, and in particular to a control method for stopping and quickly releasing a rope from a winch. Background Art

[0002] Lifting hydraulic systems are widely used in various lifting equipment. The lifting hydraulic systems in the prior art can usually only realize the lifting and lowering of cargo. However, when the fixed platform crane is performing lifting operations with the supply ship, it is necessary to perform rope collection and rope release operations, and the rope release operation needs to be stopped when the rope is released to a certain extent. In the process of collecting the rope, if the hook of the fixed platform crane is accidentally hooked on the supply ship, and the supply ship is unaware and starts to move or the state is uncontrollable, if the pull rope cannot be quickly separated from the lifting equipment, the crane or the entire platform will be dragged down by the supply ship, causing serious safety hazards.

[0003] A lifting hydraulic system is disclosed in a 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, the first shuttle valve is connected to the winch assembly through the second reversing valve and the second shuttle valve in sequence, and the first reversing valve is connected to a 3MPa constant pressure oil source through the electromagnetic reversing valve. When an emergency occurs, the coil of the electromagnetic reversing valve is 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 the rope pressing device is opened to realize automatic rope abandonment.

[0004] However, the prior art of the document relies on an external rope-pressing device to control the wire rope, that is, the control cannot be achieved directly through the hydraulic oil circuit. In this way, in an actual emergency situation, the staff not only need to control the hydraulic system, but also need to control the rope-pressing device to abandon the rope, which makes the operation complicated and it is 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, and a shuttle valve is used to realize the switching of the normal rope releasing and stopping rope releasing and the quick rope releasing operation in the rope collecting process. The control method is simple, and the rope abandonment can be realized by controlling the circulation flow of the hydraulic oil circuit at the same time. Moreover, by setting a plurality of 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 object, the technical solution of the present invention is: a control method for stopping and quickly releasing the rope of a winch, which 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 through the winch control system, and the specific steps include: (1) When the quick rope-releasing function is performed in the rope-retracting 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-retracting operation.

[0007] (15) If you need to release the rope quickly.

[0008] (16) The first control reversing valve is switched so that the A end is connected to the P end.

[0009] (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 switch and connect the first port and the second port.

[0010] (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.

[0011] (19) The oil circuit between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, and the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected.

[0012] (110) The oil tank supplies oil to 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.

[0013] (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.

[0014] (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.

[0015] The winch control system includes an oil tank, a pilot relief valve, a first switch valve, a first control valve group, a first shuttle valve and a motor. The oil tank is connected to an oil inlet pipeline, and the oil tank is connected to the oil tank through the first switch valve. A pilot relief valve and a second pilot relief valve are provided between the oil inlet pipeline and the oil return pipeline. The oil inlet end of the pilot relief valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot relief valve is connected to the oil return pipeline; the oil inlet end of the second pilot relief valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot relief valve is connected to the oil return pipeline.

[0016] 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, and the output end of the first control reversing valve is connected to the oil tank through the first control overflow valve.

[0017] In the above structure, when the rope is being reeled in, the hydraulic oil output by the oil tank enters the oil inlet pipe and then passes through the motor and the oil return pipe and enters the oil tank for circulation to realize the rope reeling operation. At the same time, a first switch valve is provided on the oil return pipe. When the motor rotates normally, the oil tank delivers the hydraulic oil to the motor through the oil inlet pipe and the oil flows into the oil return pipe through the motor. The hydraulic oil in the oil return pipe flows to the first control end of the first switch valve, thereby driving the first switch valve to switch and connect the first port and the second port, so that the oil return pipe is connected with the oil tank, and the hydraulic oil can flow back to the oil tank to realize circulation. When the heavy object is lifted by erroneous operation during the rope reeling process, it is in the rope reeling state at this time, and the oil tank supplies oil to the second control end of the first switch valve, driving the first switch valve to switch and connect the first port and the second port. The first control port and the second port are controlled to be disconnected, thereby preventing the hydraulic oil from flowing back to the oil tank from the return oil pipeline but flowing to the second port of the motor; at the same time, the first control reversing valve is switched to connect the A end with the P end, and the oil tank outputs the hydraulic oil to the control end of the first control switch valve through the first control reversing valve, so that the first control switch valve is switched and connected to the first port and the second port of the first control switch valve, thereby making the control hydraulic oil of the control oil circuit of the pilot relief valve flow back to the oil tank through the first control relief valve to release the pressure, thereby making the regulating pressure of the pilot relief valve lower, and because the oil pressure of the oil inlet pipeline is greater than the regulating pressure of the pilot relief valve, the pilot relief valve is driven to open, thereby making the hydraulic oil in the oil inlet pipeline pass through the pilot relief valve The valve releases pressure to the oil return pipe, thereby increasing the oil pressure on the oil return pipe, and making the oil pressure at the end of the motor connected to the oil return pipe greater than the oil pressure at the end of the motor connected to the oil inlet pipe, and due to the overflow effect of the pilot relief valve, a circulation loop is formed between the oil inlet pipe, the oil return pipe and the motor through the pilot relief valve, and the oil tank continues to output hydraulic oil to the oil inlet pipe, thereby increasing the hydraulic oil in the circulation loop, thereby increasing the pressure difference at both ends of the motor, and then increasing the speed of the motor to achieve rapid rope release; at the same time, by setting a second pilot relief valve, when it is necessary to increase the circulation speed of the hydraulic oil, the second pilot relief valve is controlled to open, so that the oil inlet pipe, the second pilot relief valve and the oil return pipe are connected. The oil circuit between them is connected; the hydraulic oil flows to the oil return 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 realize circulation. By adding a plurality of connected oil circuits in the oil inlet pipe and the oil outlet pipe, the circulation flow of the hydraulic oil is accelerated, thereby accelerating the rope releasing of the winch. When it is necessary to stop the rope releasing 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, and the hydraulic oil in the oil return pipe cannot be disconnected from the oil tank. Emergency rope releasing during rope collecting and stopping rope releasing during rope releasing are realized through the three ports of the first shuttle valve, and the operation method is simple.

[0018] Furthermore, a second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, 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.

[0019] The above arrangement, by providing the second switch valve, allows the oil circuit between the oil inlet pipeline 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.

[0020] 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.

[0021] The above arrangement, by setting a balancing valve group, makes the hydraulic oil output of the oil inlet pipeline stable.

[0022] Furthermore, a brake valve is provided on the motor, and 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, and the control end of the brake reversing valve is connected to the oil inlet pipeline and the oil outlet pipeline.

[0023] The above arrangement connects the oil inlet pipeline and the oil outlet pipeline through the control end of the brake valve reversing valve. When the winch is to be started, the hydraulic oil in the oil inlet pipeline and the oil outlet pipeline 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 by 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In the above arrangement, by arranging the first shuttle valve between the second control end of the first switch valve and the A end of the first control reversing valve, the hydraulic oil flowing to the second control end of the first switch valve through the first control reversing valve and the hydraulic oil flowing from the oil tank to the second control end of the first switch valve will not conflict with each other.

[0028] Furthermore, step (1) specifically includes: (11) the oil tank supplies oil to the oil inlet pipeline through the hydraulic pump.

[0029] (12) The hydraulic oil flows to the first port of the motor through the oil inlet pipe.

[0030] (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.

[0031] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

[0032] The above settings facilitate the normal rope collection state.

[0033] Furthermore, 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.

[0034] The above arrangement, by providing the third switch valve, allows 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

[0035] Figure 1 It is a schematic diagram of the hydraulic system of the present invention.

[0036] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0037] Figure 3 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] 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 comprises 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 a first port 41 of the motor 4 through an oil inlet pipeline 11, and a second port 42 of the motor 4 is connected to the oil tank 1 through an oil return pipeline 12. A pilot relief valve 2 is provided between the oil inlet pipeline 11 and the oil return pipeline 12, and the oil inlet end of the pilot relief valve 2 is connected to the oil inlet pipeline 11, and the oil outlet end of the pilot relief valve 2 is connected to the oil return pipeline 12; a first switch valve 3 is provided on the return oil pipeline 12, a 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, a second port of the first switch valve 3 is connected to the oil tank 1 through the return oil pipeline 12, a 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, a 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 relief valve 6 is connected to the oil inlet pipeline 11, and the oil outlet end of the pilot relief valve 6 is connected to the return oil pipeline 12.

[0040] 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.

[0041] In this embodiment, the control end 821 of the first control reversing valve is connected to the control button (not shown in the figure) in the crane cab through an external circuit. When an emergency occurs, the staff in the cab presses the control button to drive the first control reversing valve to achieve reversing. A first shuttle valve 84 is provided between the second control end 32 of the first switch valve 3 and the A end of the first control reversing valve 82. The first port 841 of the first shuttle valve 84 is connected to the A end of the first control reversing valve 82, the second port 842 of the first shuttle valve 84 is connected to the oil tank 1, and the third port 843 of the first shuttle valve 84 is connected to the second control end 32 of the first switch valve 3. By providing the first shuttle valve 84 between the second control end 32 of the first switch valve 3 and the A end of the first control reversing valve 82, the hydraulic oil flowing from the first control reversing valve 82 to the second control end 32 of the first switch valve 3 and the hydraulic oil flowing from the oil tank 1 to the second control end 32 of the first switch valve 3 will not conflict with each other.

[0042] A second switch valve 21 is provided between the oil inlet end of the pilot relief valve 2 and the oil inlet pipeline, wherein a first port of the second switch valve 21 is connected to the oil inlet pipeline 11, and a second port of the second switch valve 21 is connected to the oil inlet end of the pilot relief valve 2. By providing the second switch valve 21, the oil circuit between the oil inlet pipeline 11 and the pilot relief valve 2 is opened only when the pilot relief valve 2 is needed, thereby facilitating control of the hydraulic system.

[0043] A third switch valve 61 is provided between the oil inlet end of the second pilot relief valve 6 and the oil inlet pipeline 11, wherein a first port of the third switch valve 61 is connected to the oil inlet pipeline 11, and a second port of the third switch valve 61 is connected to the oil inlet end of the pilot relief valve 6. By providing the third switch valve 61, the oil circuit between the oil inlet pipeline 11 and the second pilot relief valve 6 is opened only when the second pilot relief valve 6 is needed, thereby facilitating control of the hydraulic system.

[0044] A balancing valve group 5 is provided on the oil inlet pipeline 11, and the balancing valve group 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 through the oil inlet pipeline 11, and the oil outlet end of the balancing relief valve 51 is connected to the hydraulic pump through 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. By providing the balancing valve group 5, the hydraulic oil output of the oil inlet pipeline 11 is stable.

[0045] like Figure 1As shown, a brake valve 43 is also provided on the motor 4, and the control end of the brake valve 43 is connected to the oil inlet pipeline and the oil outlet pipeline through 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 pipeline 11 and the oil outlet pipeline 12. The control end K of the brake valve reversing valve 44 is connected to the oil inlet pipeline 11 and the oil outlet pipeline 12. When the winch is to be started, the hydraulic oil in the oil inlet pipeline 11 and the oil outlet pipeline 12 flows to the control end of the brake reversing valve 44 and controls the brake reversing valve 44 to reverse so that the A end is connected to the P end, so that the oil tank 1 outputs the hydraulic oil to flow to the control end of the brake valve 43, thereby driving the brake valve 43 to open, so that the motor 4 rotates.

[0046] like Figure 2 As shown, a spring 33 is further provided on the second control end 32 of the first switch valve 3, and 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 switch valve 3. By providing the spring 33, when the first switch valve 3 is to be closed, the hydraulic oil pressure flowing from the oil tank 1 to the second control end 32 of the first switch valve 3 plus the elastic force of the spring 33 overcomes the hydraulic oil pressure at the first control end 31 of the first switch valve 3, thereby driving the first switch valve 3 to close, so that the hydraulic oil cannot flow back to the oil tank through the return oil pipeline 12.

[0047] like Figure 3 As shown, a method for controlling a winch to stop releasing a rope and quickly release a rope comprises the following specific steps: (1) When the quick rope-releasing function is performed in the rope-retracting 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-retracting operation.

[0048] (11) The oil tank supplies oil to the oil inlet pipe through the hydraulic pump.

[0049] (12) The hydraulic oil flows to the first port of the motor through the oil inlet pipe.

[0050] (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.

[0051] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

[0052] (15) If you need to release the rope quickly.

[0053] (16) The first control reversing valve is switched so that the A end is connected to the P end.

[0054] (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 switch and connect the first port and the second port.

[0055] (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.

[0056] (19) The oil circuit between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, and the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected.

[0057] (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.

[0058] 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.

[0059] (111) The hydraulic oil cannot flow back to the tank from the return oil pipe but flows to the second port of the motor.

[0060] (112) The oil tank continues to output hydraulic oil to the oil inlet pipe.

[0061] (113) The hydraulic oil flows to the oil return 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.

[0062] (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.

[0063] In the normal rope-releasing state, the control end of the first switch valve 3 has no oil intake, so the first control end 31 of the first switch valve 3 intakes oil, so that the first switch valve 3 is turned on. Since the first control switch valve is disconnected, the hydraulic oil of the oil tank 1 cannot be supplied through the first port of the first shuttle valve, and can only be supplied to 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, so that 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, so that the first switch valve 3 is disconnected, so that the rope releasing circuit is disconnected to stop rope releasing.

[0064] The working principle of the present invention is as follows: when the rope is being collected, the hydraulic oil output from the oil tank 1 enters the oil inlet pipe 11 through the balanced one-way valve 52, then passes through the motor 4 and enters the oil tank 1 through the oil return pipe 12 to circulate and realize the rope collection operation. At the same time, a first switch valve 3 is arranged on the oil return pipe 12. When the motor 4 rotates normally, the oil tank 1 delivers the hydraulic oil to the motor 4 through the oil inlet pipe 11 and flows into the oil return pipe 12 through the motor 4. The hydraulic oil in the oil return pipe 12 flows to the first control end 31 of the first switch valve 3, thereby driving the first switch valve 3 to switch and connect the first port and the second port, thereby making the oil return 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 an erroneous operation, it is in the rope-collecting state at this time, 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 switch and control the first port and the second port to be disconnected, so that the hydraulic oil cannot flow back to the oil tank 1 from the return oil pipe 12 but flows to the second port 42 of the motor 4; at the same time, the first control reversing valve 82 is switched to connect the A end with 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 switched 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 regulating pressure of the pilot relief valve 2. Since the oil pressure of the oil inlet pipeline 11 is greater than the regulating pressure of the pilot relief valve 2, the pilot relief valve 2 is driven to open, so that the hydraulic oil in the oil inlet pipeline 11 is depressurized to the return oil pipeline 12 through the pilot relief valve 2, thereby increasing the oil pressure on the return oil pipeline 12 and making the oil pressure at the end of the motor 4 connected to the return oil pipeline 12 greater than the oil pressure at the end of the motor 4 connected to the inlet pipeline 11. The oil pressure at one end connected to the oil pipeline 11 is increased, and due to the overflow effect of the pilot relief valve 2, a circulation loop is formed between the oil inlet pipeline, the oil return pipeline and the motor through the pilot relief valve, and 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 setting a second pilot relief valve, when it is necessary to increase the circulation speed of the hydraulic oil, the second pilot relief valve is controlled to open, so that the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline is connected;The hydraulic oil flows to the oil return 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 realize circulation. By adding multiple connected oil paths in the oil inlet pipe and the oil outlet pipe, the circulation of the hydraulic oil is accelerated, thereby accelerating the rope release of the winch. When it is necessary to stop the rope release in the rope release 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 to disconnect the first switch valve, so that the hydraulic oil in the oil return pipe cannot be disconnected from the oil tank. Emergency rope release during rope collection and stopping rope release during rope release are realized through the three ports of the first shuttle valve, 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-releasing function is performed in the rope-retracting 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-retracting 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 switch 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 pipeline and the pilot relief valve and the oil return pipeline, and the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected; (110) The oil tank supplies oil to 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, 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; (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 to disconnect the first switch valve, so that the hydraulic oil in the oil return pipeline cannot be disconnected from the oil tank; The winch control system includes an oil tank, a pilot 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 pipeline. The oil tank is connected to the oil tank through the first switch valve. A pilot relief valve and a second pilot relief valve are provided between the oil inlet pipeline and the oil return pipeline. The oil inlet end of the pilot relief valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot relief valve is connected to the oil return pipeline; the oil inlet end of the second pilot relief valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot 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, and the output end of the first control reversing valve is connected to the oil tank through the first control overflow valve.

2. A method for controlling the winch to stop releasing the rope and quickly release the rope 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, 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 the winch to stop releasing the rope and quickly release the 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 the stop and quick release of a winch rope according to claim 1, characterized in that: A brake valve is also provided on the motor, and 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, 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 pipeline and the oil outlet pipeline.

5. A method for controlling the winch to stop releasing the rope and quickly release the rope according to claim 1, characterized in that: A spring is also 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 the winch to stop releasing the rope and quickly release the 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 the stop and quick release of a winch 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 to the first port of the motor through the oil inlet pipe; (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 then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

8. A method for controlling the winch to stop releasing the rope and quickly release the 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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