A winch pawl anti-misoperation hydraulic system

Abstract

This utility model relates to the field of winch pawl technology and discloses a hydraulic system for preventing misoperation of winch pawls. The system includes: a hydraulic pump to provide power to the system; a main directional valve and a hydraulic motor, wherein the main directional valve controls the forward rotation of the hydraulic motor for rope winding, stopping, and reverse rotation for rope unwinding; a pawl cylinder and a pawl solenoid directional valve, wherein the pawl cylinder drives the opening and closing of the pawl; a pressure detection unit to detect the working pressure of the hydraulic motor's oil circuit; and a valve position detection unit. This utility model uses the pressure detection unit to determine whether the winch is under load and the valve position detection unit to determine whether the operator intends to lower the winch, achieving double interlocking and implementing mandatory hardware safety logic. It completely eliminates the possibility of accidental pawl retraction during any non-lowering operation, such as lifting or stopping, resulting in a high level of safety. It also integrates an alarm function to provide timely feedback on the system status, guiding operators to operate correctly and improving the overall safety level.

Description

Technical Field

[0001] This utility model relates to the field of winch pawl technology, specifically a hydraulic system for preventing misoperation of winch pawls. Background Technology

[0002] The winch is a core component of lifting and traction equipment, and its safety and reliability are directly related to the safety of life and property. To prevent the load from falling uncontrollably during the lifting process due to hydraulic system failures, such as pipe ruptures or motor leaks, a mechanical safety pawl mechanism is usually installed on the winch drum. When the winch stops working, the pawl pops out under the force of a spring or gravity, locking into the ratchet groove on the drum, forming a mechanical barrier to prevent the winch from reversing and releasing the rope.

[0003] Traditional winch pawl hydraulic control circuits typically use a separate knob or button to directly control the pawl cylinder. When the winch needs to be ready for operation, the operator must first operate this pawl knob or button to actuate the pawl cylinder, retracting the pawl from the ratchet, before the winch can be rotated. This design presents a fatal safety hazard: the operator or other personnel on site may accidentally touch or operate the pawl knob or button while the winch is in reverse rope-releasing mode. If the pawl is accidentally retracted, it can become stuck in the ratchet groove of the drum, causing a catastrophic accident resulting in the destruction of the machine and loss of life.

[0004] Existing technologies also offer some improvements. For example, some employ mechanical interlocking devices, connecting the pawl-operated knob or button to the main control handle via a linkage mechanism. However, this method is complex, space-consuming, requires significant operating force, and is prone to wear. Another approach uses a sequence valve or pressure relay for simple control, allowing the pawl cylinder to operate only when the main hydraulic pressure reaches a certain value. However, this approach cannot distinguish the source of pressure. For instance, when the winch is rotating forward to reel in the rope, the main hydraulic pressure is also high. If someone mistakenly operates the pawl valve at this time, the sequence valve will also open, causing the pawl to be incorrectly retracted during forward rope reeling, which is extremely dangerous. It cannot determine whether the operator's true intention is "forward rope reeling" or "reverse rope releasing."

[0005] Therefore, there is an urgent need in the field for a winch pawl hydraulic control system that can intelligently identify operational intentions and interlock with system status, thereby fundamentally eliminating any possibility of misoperation. Utility Model Content

[0006] The purpose of this invention is to provide a hydraulic system for preventing misoperation of winch pawls, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a winch pawl anti-misoperation hydraulic system, comprising: a hydraulic pump, providing a power source for the system; a main directional valve and a hydraulic motor, wherein the main directional valve controls the forward rotation of the hydraulic motor for rope winding, stopping, and reverse rotation for rope unwinding; a pawl cylinder and a pawl solenoid directional valve, wherein the pawl cylinder drives the opening and closing of the pawl, and the pawl solenoid directional valve is connected in series in the pipeline of the pawl cylinder; a pressure detection unit, wherein the pressure detection unit detects the working pressure of the hydraulic motor's oil circuit; a valve position detection unit, wherein the valve position is detected by the valve core position of the main directional valve; and a logic controller, wherein the signal input terminal of the logic controller receives signals from the pressure detection unit and the valve position detection unit; the logic controller internally presets a safe pressure threshold P. set When the pressure value detected by the pressure detection unit is higher than the safe pressure threshold P set Furthermore, when the valve position detection unit detects that the main directional valve is in the reverse rope release position, the logic controller controls the pawl solenoid directional valve to be energized, and the pawl cylinder piston rod retracts to drive the pawl to separate from the ratchet.

[0008] Preferably, the ratchet solenoid directional valve is a two-position three-way solenoid directional valve. When the ratchet solenoid directional valve does not receive an opening signal from the logic controller, it is in a normally closed state, and the oil port of the ratchet cylinder is connected to the return oil circuit.

[0009] Preferably, the pressure detection unit is either a pressure sensor or a pressure relay, and the valve position detection unit is either a micro switch, an inductive proximity switch, or a valve core displacement sensor.

[0010] Preferably, the logic controller further includes an audible and visual alarm. When the logic controller receives a signal from the valve position detection unit that the valve core is in the reverse rope-releasing position, and the pressure signal from the pressure detection unit is lower than the safe pressure threshold P, the alarm will be activated. set At that time, the logic controller controls the audible and visual alarm to emit a warning signal.

[0011] Preferably, the safety pressure threshold P set The system pressure corresponding to the rated lifting load of the winch is set, and its value is 60% to 90% of the system pressure corresponding to the rated lifting load of the winch; in addition, the logic controller also integrates a delay confirmation module, which is used to perform a delay confirmation after receiving the pressure signal and valve position signal that meet the conditions before outputting the opening signal, so as to prevent misjudgment.

[0012] Preferably, the logic controller is either a programmable logic controller or a microprocessor.

[0013] Preferably, it also includes an empty hook detection unit, which includes a weighing sensor for detecting whether the winch hook is suspended in the air.

[0014] Preferably, the pressure detection unit includes a main pressure sensor and a backup pressure sensor, which operate independently. The logic controller recognizes the pressure signal upon receiving a valid signal from either the main pressure sensor or the backup pressure sensor.

[0015] Preferably, the valve position detection unit includes dual proximity switches, and the logic controller performs control actions after simultaneously receiving two signals from the dual proximity switches.

[0016] Preferably, the safety pressure threshold P set The safety pressure threshold P is dynamically adjusted based on the winch's rated load and weighing sensor data. set The dynamic value is 60%-90% of the current load of the winch.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves dual interlocking by using a pressure detection unit to determine whether the winch is under load and a valve position detection unit to determine whether personnel intend to lower the winch, thus implementing mandatory hardware safety logic. It completely eliminates the possibility of accidental ratchet retraction during any non-lowering operation, such as lifting or stopping, resulting in a high level of safety. The entire system uses mature electro-hydraulic control components, with the logic implemented by the controller, avoiding the jamming and wear problems of complex mechanical mechanisms. The system is stable, durable, simple in structure, and easy to modify: this module can be added to existing winch hydraulic systems, making modification convenient, cost-effective, and easy to promote and apply. Integrated alarm function provides timely feedback on system status, guiding operators to operate correctly and improving the overall safety level.

[0018] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a hydraulic system for preventing misoperation of a winch pawl according to the present invention. Figure 2 This is a schematic diagram of the ratchet cylinder connection structure of a winch ratchet anti-misoperation hydraulic system according to the present invention; Figure 3 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 4 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 5 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 6This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 7 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 8 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 9 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention; Figure 10 This is a schematic diagram of the connection control system of a winch pawl anti-misoperation hydraulic system according to the present invention.

[0020] In the diagram: 1. Hydraulic pump; 2. Main directional valve; 3. Hydraulic motor; 4. Pawl cylinder; 5. Pressure detection unit; 6. Pawl solenoid directional valve; 7. Logic controller; 8. Valve position detection unit; 9. Dual proximity switch; 10. Empty hook detection unit; 11. Weighing sensor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1: Please refer to Figures 1-8 This utility model provides a technical solution: a winch pawl anti-misoperation hydraulic system, comprising: a hydraulic pump 1, providing a power source for the system; the hydraulic pump 1 provides stable and continuous power to the entire hydraulic system, ensuring that each actuator of the system, such as the hydraulic motor 3 and the pawl cylinder 4, can work normally; a main directional valve 2 and a hydraulic motor 3, the main directional valve 2 being used to control the forward rotation, rope winding, stopping, and reverse rotation, rope unwinding of the hydraulic motor 3; the main directional valve 2, by controlling the flow direction of hydraulic oil, achieves precise control of the forward, stopping, and reverse rotation of the hydraulic motor 3 in different working states, thereby meeting the operational requirements of the winch for rope winding and unwinding, and is a key control component for the winch to achieve its basic functions.

[0023] The pawl cylinder 4 and the pawl solenoid directional valve 6 are connected in series in the pipeline of the pawl cylinder 4. The pawl cylinder 4 is used to drive the opening and closing of the pawl. The pawl solenoid directional valve 6 is installed in series in the pipeline of the pawl cylinder 4. As an actuator, the pawl cylinder 4 can convert hydraulic energy into mechanical energy to drive the pawl to open and close, thereby realizing the braking function of the winch. The pawl solenoid directional valve 6 is connected in series in the pipeline to precisely control the oil circuit of the pawl cylinder 4, thereby controlling the timing of the pawl's action, ensuring that the pawl can act accurately under different working conditions, and improving the safety and reliability of the system.

[0024] Pressure detection unit 5 is used to detect the working pressure of the hydraulic motor 3's oil circuit. Pressure detection unit 5 monitors the working pressure of the hydraulic motor 3's oil circuit in real time. This pressure value can reflect the current working status of the winch, such as whether it is under load. It provides key data for the logic controller 7 to determine whether the system meets the conditions for safe lowering, which helps to achieve the safe control of the system.

[0025] Valve position detection unit 8 is used to detect the valve core position of the main directional valve 2. Valve position detection unit 8 can accurately detect the valve core position of the main directional valve 2, thereby determining whether the operator intends to lower heavy objects, and providing an operation intention signal to the logic controller 7. Together with the pressure detection signal, it forms a double interlocking mechanism to ensure that the pawl is allowed to separate only when safety conditions are met, thus preventing misoperation.

[0026] The logic controller 7 receives signals from the pressure detection unit 5 and the valve position detection unit 8 at its signal input terminal. The logic controller 7 has a preset safety pressure threshold Pset. When the pressure value detected by the pressure detection unit 5 is higher than the safety pressure threshold Pset, and the valve position detection unit 8 detects that the main directional valve 2 is in the reverse rope-laying position, the logic controller 7 controls the pawl solenoid directional valve 6 to be energized. This causes the piston rod of the pawl cylinder 4 to retract, driving the pawl to separate from the ratchet. As the core control component of the system, the logic controller 7 receives signals from the pressure detection unit 5 and the valve position detection unit 8, and performs logical judgments based on the preset safety pressure threshold Pset. Only when the pressure value is higher than the safety pressure threshold and the valve position is in the reverse rope-laying position is the pawl solenoid directional valve 6 energized, causing the pawl to separate from the ratchet. This implements mandatory safety logic in the hardware, completely eliminating the possibility of accidental pawl retraction during any non-lowering conditions such as lifting or stopping, greatly improving the system's safety level.

[0027] The pawl solenoid directional valve 6 is a two-position, three-way solenoid directional valve. When it does not receive an opening signal from the logic controller 7, the pawl solenoid directional valve 6 is normally closed, and the oil port of the pawl cylinder 4 is connected to the return oil circuit. This two-position, three-way solenoid directional valve design ensures that the pawl solenoid directional valve 6 is normally closed when no opening signal is received, guaranteeing that the oil port of the pawl cylinder 4 is connected to the return oil circuit. Under the action of the spring, the pawl remains locked to the ratchet, preventing the winch from rotating unexpectedly under abnormal operating conditions, thus improving the safety and stability of the system.

[0028] The pressure detection unit 5 can be either a pressure sensor or a pressure relay, and the valve position detection unit 8 can be either a micro switch, an inductive proximity switch, or a valve core displacement sensor. Multiple options for the pressure detection unit 5 and valve position detection unit 8 are provided, allowing for flexible selection of suitable detection elements based on actual application scenarios, cost, and accuracy requirements, thus improving the system's versatility and adaptability. Employing mature electro-hydraulic control components, with logic implemented by the controller, it avoids the jamming and wear problems of complex mechanical mechanisms. The system is stable, durable, simple in structure, and easy to modify: this module can be added to existing winch hydraulic systems, making modification convenient, cost-effective, and easy to promote and apply.

[0029] The logic controller 7 also includes an audible and visual alarm. When the logic controller 7 receives a signal from the valve position detection unit 8 that the valve core is in the reverse rope-laying position and the pressure signal from the pressure detection unit 5 is lower than the safe pressure threshold Pset, the logic controller 7 controls the audible and visual alarm to issue a warning signal. The audible and visual alarm can promptly inform operators of unsafe system conditions. When the system is in the reverse rope-laying position but the pressure is lower than the safe pressure threshold, an abnormal situation may exist. Issuing a warning signal reminds operators to pay attention, guides them to operate correctly, avoids safety accidents, and further improves the overall safety level.

[0030] The safety pressure threshold Pset is set based on the system pressure corresponding to the winch's rated lifting load, and its value ranges from 60% to 90% of the system pressure corresponding to the winch's rated lifting load. Furthermore, the logic controller 7 integrates a delay confirmation module, which, upon receiving a pressure signal and valve position signal that meet the conditions, performs a delay confirmation before outputting an opening signal to prevent false judgments. Setting the safety pressure threshold Pset based on the winch's rated lifting load makes the threshold setting more scientific and reasonable, accurately reflecting the safe operating range of the winch under different loads. The delay confirmation module effectively prevents false judgments caused by signal interference or instantaneous fluctuations, further improving the accuracy and reliability of the system's judgment.

[0031] The logic controller 7 can be either a programmable logic controller or a microprocessor. Both types of controllers have powerful logic processing capabilities and programming flexibility, which can meet the complex logic control requirements of the system. At the same time, they can be selected according to factors such as project budget and performance requirements, which improves the system's cost-effectiveness and scalability.

[0032] It also includes an empty hook detection unit 10, which includes a load cell 11 for detecting whether the winch hook is suspended. The empty hook detection unit 10, through the load cell 11, detects whether the winch hook is suspended, providing the system with more comprehensive status information. Combined with pressure detection and valve position detection, it further optimizes the system's safety control strategy. For example, it can avoid unnecessary pawl actions in the empty hook state, improving system operating efficiency.

[0033] Example 2: Please refer to Figures 1-10 This utility model provides a technical solution: a winch pawl anti-misoperation hydraulic system, comprising: a hydraulic pump 1, providing a power source for the system; the hydraulic pump 1 provides stable and continuous power to the entire hydraulic system, ensuring that each actuator of the system, such as the hydraulic motor 3 and the pawl cylinder 4, can work normally; a main directional valve 2 and a hydraulic motor 3, the main directional valve 2 being used to control the forward rotation, rope winding, stopping, and reverse rotation, rope unwinding of the hydraulic motor 3; the main directional valve 2, by controlling the flow direction of hydraulic oil, achieves precise control of the forward, stopping, and reverse rotation of the hydraulic motor 3 in different working states, thereby meeting the operational requirements of the winch for rope winding and unwinding, and is a key control component for the winch to achieve its basic functions.

[0034] The pawl cylinder 4 and the pawl solenoid directional valve 6 are connected in series in the pipeline of the pawl cylinder 4. The pawl cylinder 4 is used to drive the opening and closing of the pawl. The pawl solenoid directional valve 6 is installed in series in the pipeline of the pawl cylinder 4. As an actuator, the pawl cylinder 4 can convert hydraulic energy into mechanical energy to drive the pawl to open and close, thereby realizing the braking function of the winch. The pawl solenoid directional valve 6 is connected in series in the pipeline to precisely control the oil circuit of the pawl cylinder 4, thereby controlling the timing of the pawl's action, ensuring that the pawl can act accurately under different working conditions, and improving the safety and reliability of the system.

[0035] Pressure detection unit 5 is used to detect the working pressure of the hydraulic motor 3's oil circuit. Pressure detection unit 5 monitors the working pressure of the hydraulic motor 3's oil circuit in real time. This pressure value can reflect the current working status of the winch, such as whether it is under load. It provides key data for the logic controller 7 to determine whether the system meets the conditions for safe lowering, which helps to achieve the safe control of the system.

[0036] Valve position detection unit 8 is used to detect the valve core position of the main directional valve 2. Valve position detection unit 8 can accurately detect the valve core position of the main directional valve 2, thereby determining whether the operator intends to lower heavy objects, and providing an operation intention signal to the logic controller 7. Together with the pressure detection signal, it forms a double interlocking mechanism to ensure that the pawl is allowed to separate only when safety conditions are met, thus preventing misoperation.

[0037] The logic controller 7 receives signals from the pressure detection unit 5 and the valve position detection unit 8 at its signal input terminal. The logic controller 7 has a preset safety pressure threshold Pset. When the pressure value detected by the pressure detection unit 5 is higher than the safety pressure threshold Pset, and the valve position detection unit 8 detects that the main directional valve 2 is in the reverse rope-laying position, the logic controller 7 controls the pawl solenoid directional valve 6 to be energized. This causes the piston rod of the pawl cylinder 4 to retract, driving the pawl to separate from the ratchet. As the core control component of the system, the logic controller 7 receives signals from the pressure detection unit 5 and the valve position detection unit 8, and performs logical judgments based on the preset safety pressure threshold Pset. Only when the pressure value is higher than the safety pressure threshold and the valve position is in the reverse rope-laying position is the pawl solenoid directional valve 6 energized, causing the pawl to separate from the ratchet. This implements mandatory safety logic in the hardware, completely eliminating the possibility of accidental pawl retraction during any non-lowering conditions such as lifting or stopping, greatly improving the system's safety level.

[0038] The pawl solenoid directional valve 6 is a two-position, three-way solenoid directional valve. When it does not receive an opening signal from the logic controller 7, the pawl solenoid directional valve 6 is normally closed, and the oil port of the pawl cylinder 4 is connected to the return oil circuit. This two-position, three-way solenoid directional valve design ensures that the pawl solenoid directional valve 6 is normally closed when no opening signal is received, guaranteeing that the oil port of the pawl cylinder 4 is connected to the return oil circuit. Under the action of the spring, the pawl remains locked to the ratchet, preventing the winch from rotating unexpectedly under abnormal operating conditions, thus improving the safety and stability of the system.

[0039] The pressure detection unit 5 can be either a pressure sensor or a pressure relay, and the valve position detection unit 8 can be either a micro switch, an inductive proximity switch, or a valve core displacement sensor. Multiple options for the pressure detection unit 5 and valve position detection unit 8 are provided, allowing for flexible selection of suitable detection elements based on actual application scenarios, cost, and accuracy requirements, thus improving the system's versatility and adaptability. Employing mature electro-hydraulic control components, with logic implemented by the controller, it avoids the jamming and wear problems of complex mechanical mechanisms. The system is stable, durable, simple in structure, and easy to modify: this module can be added to existing winch hydraulic systems, making modification convenient, cost-effective, and easy to promote and apply.

[0040] The logic controller 7 also includes an audible and visual alarm. When the logic controller 7 receives a signal from the valve position detection unit 8 that the valve core is in the reverse rope-laying position and the pressure signal from the pressure detection unit 5 is lower than the safe pressure threshold Pset, the logic controller 7 controls the audible and visual alarm to issue a warning signal. The audible and visual alarm can promptly inform operators of unsafe system conditions. When the system is in the reverse rope-laying position but the pressure is lower than the safe pressure threshold, an abnormal situation may exist. Issuing a warning signal reminds operators to pay attention, guides them to operate correctly, avoids safety accidents, and further improves the overall safety level.

[0041] The safety pressure threshold Pset is set based on the system pressure corresponding to the winch's rated lifting load, and its value ranges from 60% to 90% of the system pressure corresponding to the winch's rated lifting load. Furthermore, the logic controller 7 integrates a delay confirmation module, which, upon receiving a pressure signal and valve position signal that meet the conditions, performs a delay confirmation before outputting an opening signal to prevent false judgments. Setting the safety pressure threshold Pset based on the winch's rated lifting load makes the threshold setting more scientific and reasonable, accurately reflecting the safe operating range of the winch under different loads. The delay confirmation module effectively prevents false judgments caused by signal interference or instantaneous fluctuations, further improving the accuracy and reliability of the system's judgment.

[0042] The logic controller 7 can be either a programmable logic controller or a microprocessor. Both types of controllers have powerful logic processing capabilities and programming flexibility, which can meet the complex logic control requirements of the system. At the same time, they can be selected according to factors such as project budget and performance requirements, which improves the system's cost-effectiveness and scalability.

[0043] It also includes an empty hook detection unit 10, which includes a load cell 11 for detecting whether the winch hook is suspended. The empty hook detection unit 10, through the load cell 11, detects whether the winch hook is suspended, providing the system with more comprehensive status information. Combined with pressure detection and valve position detection, it further optimizes the system's safety control strategy. For example, it can avoid unnecessary pawl actions in the empty hook state, improving system operating efficiency.

[0044] Please refer to the following: Figure 9 , Figure 10 The pressure detection unit 5 includes a main pressure sensor and a backup pressure sensor. The main and backup pressure sensors operate independently. The logic controller 7 recognizes a pressure signal upon receiving a valid signal from either the main or backup pressure sensor. This independent operation of the main and backup pressure sensors improves the reliability of pressure detection. Even if the main pressure sensor fails, the backup pressure sensor can still function normally and provide a valid signal, ensuring that the system does not lose its pressure detection function due to a single sensor failure and guaranteeing the safe operation of the system.

[0045] The valve position detection unit 8 includes dual proximity switches 9. The logic controller 7 receives both signals from the dual proximity switches 9 simultaneously and then performs a control action. The dual proximity switches 9 are designed with redundancy, and control action is only performed when both signals are received simultaneously. This effectively avoids system misjudgment caused by the failure or malfunction of a single proximity switch, further improving the accuracy of valve position detection and the safety of system control.

[0046] The safety pressure threshold Pset is dynamically adjusted based on the winch's rated load and the data from the weighing sensor 11. The dynamic value of the safety pressure threshold Pset is 60%-90% of the current load of the winch. By dynamically adjusting the safety pressure threshold Pset based on the winch's rated load and the data from the weighing sensor 11, the safety threshold can adapt to the actual load conditions of the winch in real time, more accurately determine whether the system is in a safe working state, and improve the system's safety and adaptability under different load conditions.

[0047] This invention achieves dual interlocking by using a pressure detection unit 5 to determine whether the winch is under load and a valve position detection unit 8 to determine whether personnel intend to lower the winch, thus implementing mandatory hardware safety logic. It completely eliminates the possibility of accidental ratchet retraction during any non-lowering operation, such as lifting or stopping, resulting in a high level of safety. The entire system uses mature electro-hydraulic control components, with the logic implemented by the controller, avoiding the jamming and wear problems of complex mechanical mechanisms. The system is stable, durable, simple in structure, and easy to modify: this module can be added to existing winch hydraulic systems, making modification convenient, cost-effective, and easy to promote and apply. Integrated alarm function provides timely feedback on system status, guiding operators to operate correctly and improving the overall safety level.

[0048] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A winch pawl anti-misoperation hydraulic system, characterized in that: include: The hydraulic pump (1) provides a power source for the system; The main reversing valve (2) and the hydraulic motor (3) are used to control the forward rotation of the hydraulic motor (3) for winding, stopping and reversing for releasing the rope. A pawl cylinder (4) and a pawl solenoid directional valve (6) are provided. The pawl cylinder (4) is used to drive the opening and closing of the pawl. The pawl solenoid directional valve (6) is installed in series in the pipeline of the pawl cylinder (4). Pressure detection unit (5), the pressure detection unit (5) is used to detect the oil circuit working pressure of hydraulic motor (3); Valve position detection unit (8) is used to detect the valve core position of the main directional valve (2); The logic controller (7) receives signals from the pressure detection unit (5) and the valve position detection unit (8) at its signal input terminal. The logic controller (7) has a preset safety pressure threshold P. set When the pressure value detected by the pressure detection unit (5) is higher than the safe pressure threshold P set When the valve position detection unit (8) detects that the main directional valve (2) is in the reverse rope release position, the logic controller (7) controls the pawl solenoid directional valve (6) to be energized, and the piston rod of the pawl cylinder (4) retracts to drive the pawl to separate from the ratchet.

2. The winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The ratchet solenoid directional valve (6) is a two-position three-way solenoid directional valve. When the ratchet solenoid directional valve (6) does not receive the opening signal from the logic controller (7), it is normally closed. The oil port of the ratchet cylinder (4) is connected to the return oil circuit.

3. The winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The pressure detection unit (5) is either a pressure sensor or a pressure relay, and the valve position detection unit (8) is either a micro switch, an inductive proximity switch, or a valve core displacement sensor.

4. The winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The logic controller (7) also includes an audible and visual alarm. When the logic controller (7) receives a signal from the valve position detection unit (8) that the valve core is in the reverse rope release position, and the pressure signal from the pressure detection unit (5) is lower than the safe pressure threshold P, the alarm will be activated. set When the logic controller (7) controls the audible and visual alarm to issue a warning signal.

5. The winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The safety pressure threshold P set The system pressure corresponding to the rated lifting load of the winch is set, and its value is 60% to 90% of the system pressure corresponding to the rated lifting load of the winch; in addition, the logic controller (7) also integrates a delay confirmation module, which is used to perform a delay confirmation after receiving the pressure signal and valve position signal that meet the conditions before outputting the opening signal to prevent misjudgment.

6. The winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The logic controller (7) is either a programmable logic controller or a microprocessor.

7. The winch pawl anti-misoperation hydraulic system according to claim 5, characterized in that: It also includes an empty hook detection unit (10), which includes a weighing sensor (11) for detecting whether the winch hook is suspended.

8. The winch pawl anti-misoperation hydraulic system according to claim 3, characterized in that: The pressure detection unit (5) includes a main pressure sensor and a backup pressure sensor. The main pressure sensor and the backup pressure sensor work independently. The logic controller (7) recognizes the pressure signal when it receives any valid signal from either the main pressure sensor or the backup pressure sensor.

9. A winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The valve position detection unit (8) includes a dual proximity switch (9), and the logic controller (7) performs control actions after simultaneously receiving two signals from the dual proximity switches (9).

10. A winch pawl anti-misoperation hydraulic system according to claim 1, characterized in that: The safety pressure threshold P set The safety pressure threshold P is dynamically adjusted based on the winch's rated load and the data from the weighing sensor (11). set The dynamic value is 60%-90% of the current load of the winch.

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