Winding control system

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a winch control system. The system comprises a hydraulic oil tank, a winch lifting control unit, a hydraulic motor, a brake, a motor balance valve set and an emergency lowering control unit, a prime motor is in driving connection with a hydraulic pump, an oil inlet of the hydraulic pump is connected with the hydraulic oil tank, and an oil outlet of the hydraulic pump is connected with an oil inlet of an electromagnetic reversing valve and the emergency lowering control unit through a one-way valve. A first working opening of the electromagnetic reversing valve is connected with a first oil passing opening of the hydraulic motor and the brake through the motor balance valve set, and a second working opening of the electromagnetic reversing valve is connected with a second oil passing opening of the hydraulic motor. The emergency lowering control unit is arranged, when a main system breaks down and a heavy object stays in the air, opening of emergency winch braking can be achieved through energy stored by the hand-operated direction valve and the energy accumulator, an oil inlet and return path of the winch motor is connected, and safe lowering of the heavy object is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a winch control system. Background Art

[0002] Due to factors such as spatial constraints and limited access to electricity, many mechanical equipment utilizes hydraulic systems with higher power density. Common lifting and luffing mechanisms within these devices also often utilize hydraulic motors to drive winches. This configuration saves installation space and increases flexibility. However, when system problems occur during operation, heavy objects often become stuck in mid-air and cannot be lowered, posing a risk to the operator.

[0003] Existing emergency technologies mostly use purely manual methods, which take a certain amount of time to open and the pressure state is unstable, resulting in a certain amount of jitter in the emergency lowering process. In addition, the emergency opening valves are now mostly concentrated on the motor valve group. In an emergency, personnel need to reach the vicinity of the winch to operate, which affects the lowering process and the safety of the operators; another emergency measure is to call another fault-free crane to reset the lifting point in the air and then lower the heavy objects suspended in the air to the ground. Although this method can achieve the corresponding purpose, its operation process is very complicated, resulting in a long processing time, making it difficult to meet the timeliness requirements of the fault handling process, and it is highly dangerous.

[0004] In order to solve the above problems, there is an urgent need to provide a winch control system that can safely and smoothly lower heavy objects that are stuck in the air and cannot be lowered to the ground. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problems that the existing hoisting mechanism has slow response efficiency, complicated operation and high risk when lowering heavy objects manually or by calling another crane in an emergency manner under no power. The utility model provides a hoisting control system, which is equipped with an emergency lowering control system. When the main system fails and the heavy object is stuck in the air in a dangerous state, the emergency hoisting brake can be opened by the energy stored in the manual reversing valve and the accumulator, and the inlet and return oil circuits of the hoisting motor are connected to complete the safe lowering of the heavy object and eliminate the dangerous state.

[0006] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a winch control system, including a hydraulic oil tank, a winch lifting control unit, a hydraulic motor, a brake, a motor balancing valve group and an emergency lowering control unit,

[0007] The hoisting and lowering control unit includes a prime mover, a hydraulic pump, and an electromagnetic directional control valve. The prime mover is drivingly connected to the hydraulic pump. The inlet of the hydraulic pump is connected to the hydraulic oil tank, and the outlet of the hydraulic pump is connected to the inlet of a check valve. The outlet of the check valve is respectively connected to the inlet of the electromagnetic directional control valve and the emergency lowering control unit. The oil return port of the electromagnetic directional control valve is connected to the hydraulic oil tank through an oil return pipeline. The first working port of the electromagnetic directional control valve is respectively connected to the first oil port of the hydraulic motor and the brake through a motor balance valve group. The second working port of the electromagnetic directional control valve is connected to the second oil port of the hydraulic motor. The oil return port of the hydraulic motor is connected to the hydraulic oil tank through a pipeline;

[0008] The motor balance valve group includes a balance valve, a first shuttle valve, a second shuttle valve, and a pilot-operated directional control valve. The inlet of the balance valve and the first inlet of the first shuttle valve are respectively connected to the first working port of the electromagnetic directional control valve. The outlet of the balance valve is connected to the first oil port of the hydraulic motor. The outlet of the first shuttle valve is connected to the first inlet of the second shuttle valve. The outlet of the second shuttle valve is connected to the brake. The second inlet of the first shuttle valve and the external control opening of the balance valve are respectively connected to the second working port of the electromagnetic directional control valve. The inlet of the pilot-operated directional control valve is connected to the first oil port of the hydraulic motor. The outlet of the pilot-operated directional control valve is connected to the second oil port of the hydraulic motor;

[0009] The emergency lowering control unit includes a charge valve, an accumulator, a ball valve, a pressure reducing valve, and a manual directional control valve. The inlet of the charge valve is connected to the outlet of the check valve. The outlet of the charge valve is connected to the inlet and outlet of the accumulator. The inlet and outlet of the accumulator are connected to the inlet of the manual directional control valve through the ball valve and the pressure reducing valve. The outlet of the manual directional control valve is respectively connected to the second inlet of the second shuttle valve and the control oil port of the pilot-operated directional control valve. The oil return ports of the pressure reducing valve and the manual directional control valve are connected to the hydraulic oil tank through a pipeline.

[0010] Further, the motor balance valve group further includes a speed limiting valve. The outlet of the pilot-operated directional control valve is connected to the second oil port of the hydraulic motor through the speed limiting valve.

[0011] Further, the hoisting and lowering control unit further includes a hoisting and lowering control safety valve. The inlet of the hoisting and lowering control safety valve is connected to the outlet of the hydraulic pump. The outlet of the hoisting and lowering control safety valve is connected to the oil return pipeline.

[0012] Further, the hoisting and lowering control unit further includes a hoisting and lowering control unloading valve. The inlet of the hoisting and lowering control unloading valve is connected to the outlet of the check valve. The outlet of the hoisting and lowering control unloading valve is connected to the oil return pipeline.

[0013] Further, the hoisting and lowering control unit further includes a pressure measuring device. The pressure measuring device is connected to the outlet of the check valve.

[0014] Furthermore, the emergency lowering control unit further includes a high-voltage relay and a low-voltage relay, and the high-voltage relay and the low-voltage relay are respectively connected to the pipeline between the charging valve and the accumulator.

[0015] Furthermore, the emergency lowering control unit also includes an emergency lowering control safety valve, the oil inlet of the emergency lowering control safety valve is connected to the oil outlet of the ball valve, and the oil outlet of the emergency lowering control safety valve is connected to the return oil pipeline.

[0016] Furthermore, the emergency lowering control unit also includes an emergency lowering control unloading valve, the oil inlet of the emergency lowering control unloading valve is connected to the oil outlet of the ball valve, and the oil outlet of the emergency lowering control unloading valve is connected to the return oil pipeline.

[0017] Furthermore, the winch control system further comprises a manual pump, an oil inlet of the manual pump is connected to the hydraulic oil tank, and an oil outlet of the manual pump is connected to the pressure reducing valve.

[0018] Furthermore, the winch control system further includes an oil replenishment one-way valve, the oil inlet of the oil replenishment one-way valve is connected to the hydraulic oil tank, and the oil outlet of the oil replenishment one-way valve is connected to the second oil port of the hydraulic motor.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The winch control system of the present invention is provided with an emergency lowering control unit for storing emergency oil sources. When the main system fails and the heavy object is suspended in mid-air in a dangerous state, the energy stored in the manual reversing valve and the accumulator can be used to open the emergency winch brake, and the inlet and return oil circuits of the winch motor are connected to complete the safe lowering of the heavy object and eliminate the dangerous state. The operation is simple and the risk is low. The emergency lowering control unit itself can complete the energy storage and unloading functions, and the energy storage pressure can be adjusted as needed. At the same time, it can be arranged away from the motor to increase the safety of operation. The system uses the weight of the heavy object itself to achieve emergency lowering, without providing active power control, which can effectively save energy.

[0021] (2) The winch control system of the utility model is provided with an oil inlet and return oil connection circuit for emergency lowering of the motor, and the opening mode is hydraulically controlled, sharing the same pressure oil circuit with the brake opening. The system is simple and can be adjusted according to the actual use status by setting a speed limiting valve in the connecting oil circuit to ensure the safe lowering of heavy objects with controllable speed. During emergency lowering, the oil does not pass through the balancing valve, avoiding the lowering jitter phenomenon caused by unstable opening of the balancing valve, thereby improving the stability and safety of the lowering.

[0022] (3) The hoisting control system of the present utility model is provided with a manual emergency unit. After both the hoisting and lowering control unit and the emergency lowering control unit fail, high-pressure oil can also be input into the system through manual emergency operation, and the emergency opening of the hoisting brake can be quickly completed to finish the emergency lowering operation.

[0023] (4) In the hoisting control system of the present utility model, during the emergency lowering process, a make-up oil valve is provided in the oil inlet path of the motor to ensure that the motor will not generate a suction state during the lowering process, causing a secondary failure of the system, and at the same time avoiding damage to the motor. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the hoisting control system of the present utility model.

[0025] In the figure: 1. Hydraulic oil tank, 2. Hydraulic pump, 3. Prime mover, 4. Manual pump, 5. Hoisting and lowering control safety valve, 6. Check valve, 7. Pressure measuring device, 8. Hoisting and lowering control unloading valve, 9. Filling valve, 10. Emergency lowering control safety valve, 11. Emergency lowering control unloading valve, 12. Electromagnetic directional valve, 13. Make-up oil check valve, 14. Pressure reducing valve, 15. Ball valve, 16. Accumulator, 17. Low-pressure relay, 18. High-pressure relay, 19. Manual directional valve, 20. Balance valve, 21. First shuttle valve, 22. Second shuttle valve, 23. Hydraulically controlled directional valve, 24. Speed limiting valve, 25. Motor balance valve group, 26. Hydraulic motor, 27. Brake. Detailed Embodiments

[0026] The present utility model will be described in detail below with reference to the drawings and embodiments, but the present utility model is not limited to the specific embodiments.

[0027] As Figure 1 shown, a hoisting control system includes a hydraulic oil tank 1, a hoisting and lowering control unit, a hydraulic motor 26, a brake 27, a motor balance valve group 25, and an emergency lowering control unit.

[0028] The hoisting and lowering control unit includes a prime mover 3, a hydraulic pump 2, and an electromagnetic directional valve 12. The prime mover 3 is drivingly connected to the hydraulic pump 2. The inlet of the hydraulic pump 2 is connected to the hydraulic oil tank 1. The outlet of the hydraulic pump 2 is connected to the inlet of the check valve 6. The outlet of the check valve 6 is respectively connected to the inlet of the electromagnetic directional valve 12 and the emergency lowering control unit. The return port of the electromagnetic directional valve 12 is connected to the hydraulic oil tank 1 through a return oil pipeline. The first working port of the electromagnetic directional valve 12 is respectively connected to the first oil port of the hydraulic motor 26 and the brake 27 through the motor balance valve group 25. The second working port of the electromagnetic directional valve 12 is connected to the second oil port of the hydraulic motor 26. The return port of the hydraulic motor 26 is connected to the hydraulic oil tank 1 through a pipeline.

[0029] Preferably, the hoisting control unit further includes a hoisting control safety valve 5. The oil inlet of the hoisting control safety valve 5 is connected to the oil outlet of the hydraulic pump 2, and the oil outlet of the hoisting control safety valve 5 is connected to the return pipeline.

[0030] Preferably, the hoisting control unit further includes a hoisting control unloading valve 8. The oil inlet of the hoisting control unloading valve 8 is connected to the oil outlet of the check valve 6, and the oil outlet of the hoisting control unloading valve 8 is connected to the return pipeline.

[0031] Preferably, the hoisting control unit further includes a pressure measuring device 7. The pressure measuring device 7 is connected to the oil outlet of the check valve 6.

[0032] The motor balance valve group 25 includes a balance valve 20, a first shuttle valve 21, a second shuttle valve 22, a hydraulic control directional valve 23, and a speed limiting valve 24. The oil inlet of the balance valve 20 and the first oil inlet of the first shuttle valve 21 are respectively connected to the first working port of the electromagnetic directional valve 12. The oil outlet of the balance valve 20 is connected to the first oil passage port of the hydraulic motor 26. The oil outlet of the first shuttle valve 21 is connected to the first oil inlet of the second shuttle valve 22. The oil outlet of the second shuttle valve 22 is connected to the brake 27. The second oil inlet of the first shuttle valve 21 and the external control opening port of the balance valve 20 are respectively connected to the second working port of the electromagnetic directional valve 12. The oil inlet of the hydraulic control directional valve 23 is connected to the first oil passage port of the hydraulic motor 26. The oil outlet of the hydraulic control directional valve 23 is connected to the second oil passage port of the hydraulic motor 26 through the speed limiting valve 24.

[0033] The motor balance valve group 25 can be installed on the hydraulic motor 26 or placed near the motor and connected through pipelines. Among them, a balance valve 20 is installed in the circuit on the bearing side of the hydraulic motor 26 to counteract the load when the heavy object is lowered during normal operation. Conventional brake opening shuttle valves and emergency opening shuttle valves are provided in the motor balance valve group 25 to switch and select the braking pressure under different working conditions. In the oil circuit between the hydraulic motor 26 and the balance valve 20, a hydraulic control directional valve 23 that connects the two chambers of the motor during emergency is installed to meet the circulation of the oil in the two chambers under emergency conditions, and the opening method is hydraulic control opening, sharing the same pressure oil circuit with the brake opening, making the system simple. A speed limiting valve 24 is installed behind the hydraulic control directional valve 23 to limit the speed of emergency lowering, prevent the heavy object from lowering too fast and causing stall or impact, and ensure the safe lowering of the heavy object with controllable speed. During emergency lowering, the oil does not pass through the balance valve 20, avoiding the lowering jitter phenomenon caused by unstable opening of the balance valve 20 and improving the smoothness and safety of lowering. The hydraulic motor 26 is connected to the reducer to drive the drum to rotate, completing the lifting and lowering actions of the heavy object. A hydraulically opened normally closed parking brake 27 is installed on the reducer. When the hoisting stops operating, the brake 27 closes to ensure the effective stop of the hoisting mechanism.

[0034] The emergency lowering control preferably includes a liquid filling valve 9, an accumulator 16, a ball valve 15, a pressure reducing valve 14, and a manual reversing valve 19. The oil inlet of the liquid filling valve 9 is connected to the oil outlet of the check valve 6. The oil outlet of the liquid filling valve 9 is connected to the oil inlet and outlet of the accumulator 16. The oil inlet and outlet of the accumulator 16 are connected to the oil inlet of the manual reversing valve 19 through the ball valve 15 and the pressure reducing valve 14. The oil outlet of the manual reversing valve 19 is respectively connected to the second oil inlet of the second shuttle valve 22 and the control oil port of the hydraulic control reversing valve 23. The oil return ports of the pressure reducing valve 14 and the manual reversing valve 19 are connected to the hydraulic oil tank 1 through pipelines.

[0035] Preferably, the emergency lowering control unit further includes a high-voltage relay 18 and a low-voltage relay 17, which are respectively connected to the pipeline between the liquid filling valve 9 and the accumulator 16.

[0036] Preferably, the emergency lowering control unit further includes an emergency lowering control safety valve 10. The oil inlet of the emergency lowering control safety valve 10 is connected to the oil outlet of the ball valve 15, and the oil outlet of the emergency lowering control safety valve 10 is connected to the oil return pipeline.

[0037] Preferably, the emergency lowering control unit further includes an emergency lowering control unloading valve 11. The oil inlet of the emergency lowering control unloading valve 11 is connected to the oil outlet of the ball valve 15, and the oil outlet of the emergency lowering control unloading valve 11 is connected to the oil return pipeline.

[0038] The hoisting control system further includes a manual pump 4. The oil inlet of the manual pump 4 is connected to the hydraulic oil tank 1, and the oil outlet of the manual pump 4 is connected to the oil inlet of the pressure reducing valve 14.

[0039] A manual emergency device is provided in the system. Its oil suction port is connected to the hydraulic oil tank, and its oil outlet is connected to the oil circuit between the accumulator and the pressure reducing valve. After the emergency lowering control unit fails, manual emergency operation can also be used to input high-pressure oil into the system, so as to quickly complete the emergency opening of the hoisting brake and complete the emergency lowering operation, further improving the redundancy and reliability of the system.

[0040] The hoisting control system further includes a make-up oil check valve 13. The oil inlet of the make-up oil check valve 13 is connected to the hydraulic oil tank 1, and the oil outlet of the make-up oil check valve 13 is connected to the second oil port of the hydraulic motor 26.

[0041] During the emergency lowering process, a make-up oil valve is provided in the oil inlet circuit of the motor to compensate for the possible shortage of oil caused by system leakage, ensure that the motor will not generate a suction void state during the lowering process and cause a secondary system failure, and at the same time avoid damage to the motor.

[0042] The working principle of a hoisting control system of the utility model is as follows: The prime mover 3 drives the hydraulic pump 2 to suck oil from the hydraulic oil tank 1 and input high-pressure oil into the system. The outlet of the hydraulic pump 2 is connected to the inlet of the hoisting and lowering control safety valve 5 and the inlet of the check valve 6. A safety overflow valve is set in the system to protect the system. A check valve 6 is set at the outlet of the hydraulic pump 2 to prevent damage to the hydraulic pump 2 caused by system impact. The outlet of the check valve 6 is connected to the pressure measuring device 7, the inlet of the hoisting and lowering control unloading valve 8, the inlet of the electromagnetic reversing valve 12 and the inlet of the filling valve 9. A no-action unloading valve is set in the system. When the mechanism stops running and the prime mover does not stop working, the system unloads at low pressure, reducing energy loss and saving energy. The high-pressure oil in the system enters the inlet of the electromagnetic reversing valve 12. The oil circuit is switched through the electromagnetic reversing valve 12, thereby changing the rotation direction of the motor and realizing the lifting and lowering of heavy objects. Another way is to enter the inlet of the filling valve 9 of the emergency lowering control device. When energy storage is required, oil is supplied to the accumulator.

[0043] The electromagnetic reversing valve 12 is a three-position four-way valve. Under normal working conditions, the hoisting and lowering control unloading valve 8 is energized and the system builds pressure. At this time, when the hoist needs to lift, the left electromagnet of the solenoid reversing valve 12 is energized, and the valve switches to the left position. The high-pressure oil enters the motor balance valve group 25 through the first working port and pipeline of the solenoid reversing valve 12, passes through the balance valve 20 and the first oil passage port and enters the hydraulic motor 26. At the same time, the oil passes through the first shuttle valve 21 and the second shuttle valve 22 and then enters the brake 27 to open the brake, and the lifting mechanism starts to rotate to complete the lifting action. The oil in the hydraulic motor 26 returns to the hydraulic oil tank 1 through the second oil passage port of the hydraulic motor 26 and the electromagnetic reversing valve 12; when the hoist needs to lower, the right electromagnet of the solenoid reversing valve 12 is energized, and the valve switches to the right position. The high-pressure oil enters the motor balance valve group 25 through the second working port and pipeline of the solenoid reversing valve 12, enters the hydraulic motor 26 through the second oil passage port, and at the same time, the oil passes through the first shuttle valve 21 and the second shuttle valve 22 and then enters the brake 27 to open the brake and enters the external control opening of the balance valve 20, and the lifting mechanism starts to rotate in the reverse direction to complete the lowering action. The oil in the hydraulic motor 26 returns to the hydraulic oil tank 1 through the first oil passage port of the hydraulic motor 26, the balance valve 20 and the electromagnetic reversing valve 12.

[0044] When the accumulator 16 needs to be filled with liquid, the prime mover 3 starts, the hoisting and lowering control unloading valve 8 is energized, and the filling valve 9 is energized. The oil enters the accumulator 16 to start filling. At this time, the ball valve 15 needs to be closed. High and low pressure detection relays are set in the emergency lowering control unit. During energy storage, when the oil reaches the set value of the high-pressure relay 18, the system automatically cuts off the oil circuit to complete the energy storage action. During use, when the pressure of the accumulator 16 drops to the set value of the low-pressure relay 17, the low-pressure relay 17 acts, and the system gives an alarm prompt to remind the staff to perform the pressure replenishment operation. If unloading operation is required, the emergency lowering control unloading valve 11 is energized to open the ball valve 15, and the accumulator 16 unloads.

[0045] Emergency operation of the emergency lowering control unit: When the crane fails and stops, the hydraulic pump 2 cannot work, the electromagnetic reversing valve 12 loses power supply, and the main system fails. At this time, the ball valve 15 is opened, and the high-pressure oil stored in the accumulator 16 is input to the inlet of the manual reversing valve 19 through the pressure reducing valve 14. The manual reversing valve 19 is manipulated to the left position, and the pressure oil is connected to the motor balance valve group 25 to control the opening of the hydraulic control reversing valve 23 and the brake 27. The pressure oil first reaches the hydraulic control reversing valve 23, pushes the hydraulic control reversing valve 23 to reverse, and connects the two oil ports of the hydraulic motor 26. Then the oil enters the brake 27 through the second shuttle valve 22, and the hoisting mechanism is under the heavy load. Driven by the crane, it starts to rotate, and the oil returns to the second oil port of the hydraulic motor 26 after passing through the hydraulically controlled reversing valve 23 and the speed limiting valve 24 from the first oil port of the hydraulic motor 26. Since the manual reversing valve 19 and the hydraulically controlled reversing valve 23 are not restricted by the power supply, the switching actions of the two are not affected by the crane failure and shutdown. At the same time, under the action of the speed limiting valve 24, the heavy object can be lowered to the ground smoothly and at a uniform speed. During this process, if there is insufficient oil in the circulation loop, the oil is absorbed by the oil replenishment one-way valve 13 for replenishment. The emergency lowering control unit is connected to the motor balancing valve group through a hydraulic pipeline and can be installed in a position on the equipment that is convenient for operation.

[0046] When the emergency lowering control unit fails, the ball valve 15 is closed, the manual reversing valve 19 is operated to reverse, and the manual pump 4 is operated to provide high-pressure oil to the motor balancing valve group 25 to realize the emergency lowering function.

[0047] The winch control system of the utility model is provided with an emergency lowering control device for storing an emergency oil source. When a main system fails and a heavy object remains in the air in a dangerous state, the energy stored in the manual reversing valve and the accumulator can be used to open the emergency winch brake, and the inlet and return oil circuits of the winch motor are connected to complete the safe lowering of the heavy object and eliminate the dangerous state. The operation is simple and the risk is low. The emergency lowering control device itself can complete the energy storage and unloading functions, and the energy storage pressure can be adjusted as needed. At the same time, it can be arranged away from the motor to increase the safety of operation. The system uses the weight of the heavy object itself to achieve emergency lowering, and there is no need to provide active power control, which can effectively save energy.

[0048] The above content is a further detailed description of the present invention in conjunction with the preferred technical solution, and the specific implementation of the present invention cannot be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered as within the scope of protection of the present invention.

Claims

1. A hoisting control system, characterized in that: It includes a hydraulic oil tank, a hoisting and lowering control unit, a hydraulic motor, a brake, a motor balance valve group, and an emergency lowering control unit. The hoisting and lowering control unit includes a prime mover, a hydraulic pump, and an electromagnetic directional control valve. The prime mover is drivingly connected to the hydraulic pump. The inlet of the hydraulic pump is connected to the hydraulic oil tank. The outlet of the hydraulic pump is connected to the inlet of a check valve. The outlet of the check valve is respectively connected to the inlet of the electromagnetic directional control valve and the emergency lowering control unit. The oil return port of the electromagnetic directional control valve is connected to the hydraulic oil tank via an oil return pipeline. The first working port of the electromagnetic directional control valve is respectively connected to the first oil port of the hydraulic motor and the brake through the motor balance valve group. The second working port of the electromagnetic directional control valve is connected to the second oil port of the hydraulic motor. The oil return port of the hydraulic motor is connected to the hydraulic oil tank via a pipeline. The motor balance valve group includes a balance valve, a first shuttle valve, a second shuttle valve, and a pilot-operated directional control valve. The inlet of the balance valve and the first inlet of the first shuttle valve are respectively connected to the first working port of the electromagnetic directional control valve. The outlet of the balance valve is connected to the first oil port of the hydraulic motor. The outlet of the first shuttle valve is connected to the first inlet of the second shuttle valve. The outlet of the second shuttle valve is connected to the brake. The second inlet of the first shuttle valve and the external control opening of the balance valve are respectively connected to the second working port of the electromagnetic directional control valve. The inlet of the pilot-operated directional control valve is connected to the first oil port of the hydraulic motor. The outlet of the pilot-operated directional control valve is connected to the second oil port of the hydraulic motor. The emergency lowering control unit includes a charge valve, an accumulator, a ball valve, a pressure reducing valve, and a manual directional control valve. The inlet of the charge valve is connected to the outlet of the check valve. The outlet of the charge valve is connected to the inlet and outlet of the accumulator. The inlet and outlet of the accumulator are connected to the inlet of the manual directional control valve through the ball valve and the pressure reducing valve. The outlet of the manual directional control valve is respectively connected to the second inlet of the second shuttle valve and the control oil port of the pilot-operated directional control valve. The oil return ports of the pressure reducing valve and the manual directional control valve are connected to the hydraulic oil tank via a pipeline.

2. The winch control system according to claim 1, characterized in that: The motor balance valve group further includes a speed limiting valve. The outlet of the pilot-operated directional control valve is connected to the second oil port of the hydraulic motor via the speed limiting valve.

3. The hoisting control system according to claim 1, wherein: The hoisting and lowering control unit further includes a hoisting and lowering control safety valve. The inlet of the hoisting and lowering control safety valve is connected to the outlet of the hydraulic pump. The outlet of the hoisting and lowering control safety valve is connected to the oil return pipeline.

4. A winch control system according to claim 1, characterized in that: The hoisting and lowering control unit further includes a hoisting and lowering control unloading valve. The inlet of the hoisting and lowering control unloading valve is connected to the outlet of the check valve. The outlet of the hoisting and lowering control unloading valve is connected to the oil return pipeline.

5. A winch control system according to claim 1, characterized in that: The hoisting and lowering control unit further includes a pressure measuring device. The pressure measuring device is connected to the outlet of the check valve.

6. The hoisting control system according to claim 1, characterized in that: The emergency lowering control unit further includes a high-pressure relay and a low-pressure relay. The high-pressure relay and the low-pressure relay are respectively connected to the pipeline between the charge valve and the accumulator.

7. A winch control system according to claim 1, characterized in that: The emergency lowering control unit further includes an emergency lowering control safety valve. The inlet of the emergency lowering control safety valve is connected to the outlet of the ball valve. The outlet of the emergency lowering control safety valve is connected to the oil return pipeline.

8. The winch control system according to claim 1, characterized in that: The emergency lowering control unit further includes an emergency lowering control unloading valve. The oil inlet of the emergency lowering control unloading valve is connected to the oil outlet of the ball valve, and the oil outlet of the emergency lowering control unloading valve is connected to the return oil pipeline.

9. A winch control system according to claim 1, characterized in that: The hoisting control system further includes a manual pump. The oil inlet of the manual pump is connected to the hydraulic oil tank, and the oil outlet of the manual pump is connected to the pressure reducing valve.

10. The winch control system according to claim 1, characterized in that: The hoisting control system further includes a make-up check valve. The oil inlet of the make-up check valve is connected to the hydraulic oil tank, and the oil outlet of the make-up check valve is connected to the second oil port of the hydraulic motor.

Images