An automatic protection system for winch overloading

Abstract

The application provides an automatic protection system for winch overload, comprising a winch control system, the winch control system comprising an oil tank, a driving oil circuit, a second control valve group, a detection component and a motor, the driving oil circuit comprising a pilot relief valve and a balance valve, the oil tank being connected with a first port and a second port of the motor through an oil inlet pipeline and an oil return pipeline, a pilot relief valve being arranged between the oil inlet pipeline and the oil return pipeline, an oil inlet end of the pilot relief valve being connected with the oil inlet pipeline, an oil outlet end of the pilot relief valve being connected with the oil return pipeline, and the balance valve being arranged between the oil inlet end of the pilot relief valve and the oil inlet pipeline; the structure can adjust the oil discharge pressure of the relief valve according to the current required oil discharge pressure of the crane, so that the hydraulic oil circuit can be kept stable, and the oil discharge pressure of the relief valve does not need to be manually adjusted, so that the work efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of winch control systems, and particularly relates to an automatic protection system for winch overload. BACKGROUND

[0002] A winch is a small lifting device that lifts or pulls heavy objects by winding a steel wire rope or chain around a drum. Due to its simple operation and strong load capacity, the winch is widely used in marine engineering, ships, coal mines, wharfs, mines, bridges, etc. In the marine environment, the hydraulic control system is usually used to control the rotation of the hydraulic motor, and then the hydraulic motor drives the winch to operate, thereby completing the operation of winding and unwinding the rope and other operations related to the winch.

[0003] In the patent document with the Chinese patent application number 202311396506.4 and the publication date of 2024.04.16, a hydraulic oil circuit overload protection method is disclosed. The full load oil pressure value of the winch system under full load operation is recorded at different throttle valve openings. Thus, the oil pressure value of 1.1 times or more overload can be calculated at the current full load oil pressure value, and the calculation is accurate. The throttle valve amplifies the oil pressure in the oil pump and multi-way valve group area, which increases the difference between the full load oil pressure value and the overload oil pressure value, and the pressure switch can accurately detect the difference between the full load oil pressure value and the overload oil pressure value. Thus, the pressure switch can accurately detect whether the winch system is overloaded.

[0004] When the document detects overload, the relief valve is opened. However, as in the prior art of the document, the relief valve pressure is generally pre-set, and when overload is detected, the relief valve is opened. Thus, if the relief valve pressure is high, a high hydraulic oil pressure is required to open the relief valve, and if the relief valve pressure needs to be adjusted, the machine needs to be stopped first, which can waste working time and reduce efficiency. SUMMARY

[0005] The present application provides an automatic protection system for winch overload, which can adjust the oil pressure of the relief valve according to the current required oil pressure of the crane, balance the oil pressure, and ensure that the hydraulic oil circuit remains stable without manual adjustment of the relief valve pressure, thereby improving work efficiency.

[0006] In order to achieve the above object, the technical scheme of the present application is: an automatic protection system for overload of a winch, comprising a winch control system, the winch control system comprising an oil tank, a driving oil circuit, a second control valve group, a detection component and a motor, the driving oil circuit comprising a pilot relief valve and a balance valve, the oil tank being connected to a first port and a second port of the motor through an oil inlet pipeline and an oil outlet pipeline, a pilot relief valve being arranged between the oil inlet pipeline and the oil outlet pipeline, an oil inlet end of the pilot relief valve being connected to the oil inlet pipeline, and an oil outlet end of the pilot relief valve being connected to the oil outlet pipeline, the balance valve being arranged between the oil inlet end of the pilot relief valve and the oil inlet pipeline.

[0007] The second control valve group comprises a second control on-off valve, a second control reversing valve and a second control relief valve, an output end of the second control reversing valve being connected to a control end of the second control on-off valve, the output end of the second control reversing valve being connected to the oil tank, an input end of the second control on-off valve being connected to a control oil circuit of the pilot relief valve, and the output end of the second control reversing valve being connected to the oil tank through the second control relief valve.

[0008] The detection component is communicatively connected to the second control reversing valve, the detection component comprising an inclination sensor arranged on a crane and a force sensor arranged on the winch, the inclination sensor and the force sensor being connected to a control end of the second control reversing valve through a terminal processor; a pressure regulator is further arranged at a control end of the second control relief valve, the pressure regulator being communicatively connected to the terminal processor.

[0009] The above structure, when the rope is collected, the oil tank outputs hydraulic oil into the oil inlet pipeline, then passes through the motor and enters the oil tank through the oil return pipeline to realize the rope collection operation. When the hoist is operated, the inclination sensor detects the working radius of the crane, and the force sensor detects the tension of the steel wire rope in the rope collection state, so that the terminal processor calculates the current overturning moment of the crane according to the working radius of the crane and the tension of the steel wire rope. By comparing the current overturning moment of the crane with the pre-set overturning moment, when the current overturning moment of the crane exceeds the pre-set overturning moment, the terminal processor drives the second control valve to reverse and makes the A end and the P end communicate. The oil tank outputs hydraulic oil to the control end of the second control switch valve through the second control reversing valve, so that the second control switch valve reverses and communicates the first port and the second port of the second control switch valve, so that the control hydraulic oil of the control oil way of the pilot overflow valve is discharged through the second control overflow valve and flows back to the oil tank, so that the adjusting pressure of the pilot overflow valve is low. At this time, the oil tank outputs hydraulic oil from the oil return pipeline to the motor and flows back to the oil tank through the oil inlet pipeline to form a circulation to realize the rope release. Part of the hydraulic oil in the oil inlet pipeline flows to the oil return pipeline through the pilot overflow valve, so that the hydraulic oil pressure of the oil return pipeline is high, the hydraulic oil can quickly flow into the motor and flow back to the oil tank through the oil inlet pipeline, thereby speeding up the flow of hydraulic oil through the motor, thereby ensuring that the winch can quickly release the rope and ensure that the winch cannot hard pull the heavy object to damage the structure of the crane. At the same time, the terminal processor controls the pressure regulator in real time according to the overturning moment of the crane, so as to drive the second control overflow valve to adjust the discharge pressure, so as to ensure that the adjusting pressure of the pilot overflow valve is within the control range, so as to ensure that the hydraulic oil pressure is not too large or too small, so as to ensure that the overturning moment of the crane is within a safe range, so that the hydraulic oil in the oil inlet pipeline can flow to the oil return pipeline to ensure quick rope release while ensuring stable hydraulic oil circuit. By setting the balance valve between the pilot overflow valve and the oil inlet pipeline, the balance valve can balance the stability of the output oil pressure of the oil inlet pipeline.

[0010] Further, a second switch valve is arranged between the oil inlet end of the pilot overflow valve and the oil inlet pipeline. The first port of the second switch valve is connected to the oil inlet pipeline, and the second port of the second switch valve is connected to the oil inlet end of the pilot overflow valve.

[0011] The above arrangement, by arranging the second switch valve, the oil circuit between the oil inlet pipeline and the pilot overflow valve is opened only when the pilot overflow valve is needed, thereby facilitating control of the hydraulic system.

[0012] Further, the balance valve group is arranged on the oil inlet pipeline, the balance valve group comprises a balance overflow valve and a balance check valve, the oil inlet end of the balance overflow valve is connected with the first port of the motor through the oil inlet pipeline, the oil outlet end of the balance overflow valve is connected with the hydraulic pump through the oil inlet pipeline, the oil inlet end of the balance check valve is connected with the oil outlet end of the balance overflow valve, and the oil outlet end of the balance check valve is connected with the oil inlet end of the balance overflow valve.

[0013] The above arrangement, by arranging the balance valve group, makes the hydraulic oil output of the oil inlet pipeline stable.

[0014] Further, the brake valve is further arranged on the motor, the control end of the brake valve is connected with the oil inlet pipeline and the oil outlet pipeline through the brake reversing valve, the P end of the brake reversing valve is connected with the oil tank, the A end of the brake reversing valve is connected with the control end of the brake valve, and the control end of the brake reversing valve is connected with the oil inlet pipeline and the oil outlet pipeline.

[0015] The above arrangement, by connecting the control end of the brake valve reversing valve with the oil inlet pipeline and the oil outlet pipeline, when the winch is started, the hydraulic oil of the oil inlet pipeline and the oil outlet pipeline flows to the control end of the brake reversing valve and controls the brake reversing valve to reverse so that the A end is communicated with the P end, so that the oil tank outputs the hydraulic oil to the control end of the brake valve, thereby driving the brake valve to open, facilitating the rotation of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the hydraulic system of the present application.

[0017] Figure 2 It is Figure 1 It is an enlarged view of A in the middle.

[0018] Figure 3 It is Figure 1 It is an enlarged view of B in the middle. DETAILED DESCRIPTION

[0019] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0020] As Figures 1-3As shown, an automatic protection system for winch overload includes a winch control system, the winch control system includes an oil tank 1, a pilot relief valve 2, a motor 4, a detection component (not shown in the figure) and a second control valve group, a hydraulic pump (not shown in the figure) is arranged on the oil tank 1, the hydraulic pump is connected to the motor through a driving oil way 011, the driving oil way 011 includes an oil inlet pipeline 11 and an oil return pipeline 12, the hydraulic pump is connected to a first port 41 of the motor 4 through the oil inlet pipeline 11, a second port 42 of the motor 4 is connected to the oil tank 1 through the oil return pipeline 12, the pilot relief valve 2 is arranged between the oil inlet pipeline 11 and the oil return pipeline 12, an oil inlet end of the pilot relief valve 2 is connected to the oil inlet pipeline 11, and an oil outlet end of the pilot relief valve 2 is connected to the oil return pipeline 12.

[0021] The second control valve group includes a second control on-off valve 91, a second control reversing valve 92 and a second control relief valve 93, a P end and a T end of the second control reversing valve 92 are connected to the oil tank 1, an A end of the second control reversing valve 92 is connected to a control end 911 of the second control on-off valve 91, a first port of the second control on-off valve 91 is connected to the oil tank 1 through the second control relief valve 93, a second port of the second control on-off valve 91 is connected to a control oil way 20 of the pilot relief valve 2, and a relief pressure of the second control relief valve 93 is less than a control pressure of the control oil way 20 of the pilot relief valve 2.

[0022] The detection component is communicatively connected to the second control reversing valve 92, the detection component includes an inclination sensor arranged on a crane and a force sensor arranged on the winch, the inclination sensor and the force sensor are connected to a control end of the second control reversing valve 92 through a terminal processor; a pressure regulator 931 is further arranged at a control end of the second control relief valve 93, and the pressure regulator 931 is communicatively connected to the terminal processor. In the embodiment, the terminal processor is a device for processing information such as PLC or CPU, which is specific to the prior art and will not be described here.

[0023] A second on-off valve 21 is arranged between an oil inlet end of the pilot relief valve 2 and the oil inlet pipeline, a first port of the second on-off valve 21 is connected to the oil inlet pipeline 11, and a second port of the second on-off valve 21 is connected to the oil inlet end of the pilot relief valve 2. By arranging the second on-off valve 21, the oil way between the oil inlet pipeline 11 and the pilot relief valve 2 is opened only when the pilot relief valve 2 needs to be used, so that the hydraulic system is facilitated to be controlled.

[0024] The balance valve group 5 is arranged on the oil inlet pipeline 11, which comprises a balance overflow valve 51 and a balance check valve 52. The oil inlet end of the balance overflow 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 balance overflow valve 51 is connected to the hydraulic pump through the oil inlet pipeline 11. The oil inlet end of the balance check valve 52 is connected to the oil outlet end of the balance overflow valve 51, and the oil outlet end of the balance check valve 52 is connected to the oil inlet end of the balance overflow valve 51. The balance valve group 5 is arranged to stabilize the output of the hydraulic oil of the oil inlet pipeline 11.

[0025] As shown in Figure 1 The brake valve 43 is further arranged on the motor 4, the control end of the brake valve 43 is connected to the oil inlet pipeline and the oil outlet pipeline through the 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 started, the hydraulic oil of 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 communicated with the P end, so that the oil tank 1 outputs the hydraulic oil to the control end of the brake valve 43, thereby driving the brake valve 43 to open, facilitating the rotation of the motor 4.

[0026] The working principle of the present application is as follows: when the rope is collected, the oil tank 1 outputs hydraulic oil through the balance check valve 52 into the oil inlet pipeline 11, then through the motor 4 and through the oil return pipeline 12 into the oil tank 1 to circulate to realize the rope collection operation; when the hoist is operated to lift the load, at this time, the rope is collected, the tilt angle sensor detects the working radius of the crane, and the load sensor detects the tension of the steel wire rope in the rope collection state, so that the terminal processor calculates the current overturning moment of the crane according to the working radius of the crane and the tension of the steel wire rope, compares the current overturning moment of the crane with the pre-set overturning moment, and when the current overturning moment of the crane exceeds the pre-set overturning moment, the terminal processor drives the second control valve 92 to reverse and makes the A end communicate with the P end, the oil tank outputs hydraulic oil to the control end 911 of the second control switch valve 91 through the second control reversing valve 92, makes the second control switch valve 91 reverse and communicate the first port and the second port of the second control switch valve 91, so that the control hydraulic oil of the control oil way 20 of the pilot operated relief valve 2 flows back to the oil tank through the second control relief valve 93, so that the adjusting pressure of the pilot operated relief valve 2 is lowered, at this time, the oil tank outputs hydraulic oil from the oil return pipeline to the motor and flows back to the oil tank through the oil inlet pipeline to form a circulation to realize the rope release, and part of the hydraulic oil in the oil inlet pipeline flows to the oil return pipeline through the pilot operated relief valve, so that the hydraulic oil pressure of the oil return pipeline is increased, the hydraulic oil can quickly flow into the motor and flow back to the oil tank through the oil inlet pipeline, so as to speed up the flow of hydraulic oil through the motor, so as to ensure that the winch can quickly release the rope and ensure that the winch cannot hard pull the load to damage the structure of the crane. At the same time, the terminal processor controls the pressure regulator according to the overturning moment of the crane in real time, so as to drive the relief pressure of the second control relief valve 93 to adjust, ensure that the adjusting pressure of the pilot operated relief valve can be within the control range, ensure that the hydraulic oil pressure is not too large or too small, ensure that the overturning moment of the crane can be within the safe range, so that the hydraulic oil in the oil inlet pipeline can flow to the oil return pipeline to ensure quick rope release and also ensure stable hydraulic oil circuit.

Claims

1. An automatic protection system for winch overload comprising a winch control system characterised in that: The winch control system comprises an oil tank, a drive oil circuit, a second control valve group, a detection component and a motor, the drive oil circuit comprises a pilot relief valve and a balance valve group, the oil tank is connected with the first port and the second port of the motor through an oil inlet pipeline and an oil return pipeline, a pilot relief valve is arranged between the oil inlet pipeline and the oil return pipeline, the oil inlet end of the pilot relief valve is connected with the oil inlet pipeline, the oil outlet end of the pilot relief valve is connected with the oil return pipeline, and the balance valve group is arranged on the oil inlet pipeline; The second control valve group comprises a second control switch valve, a second control reversing valve and a second control relief valve, the output end of the second control reversing valve is connected with the control end of the second control switch valve, the P end and the T end of the second control reversing valve are connected with the oil tank, the input end of the second control switch valve is connected with the control oil circuit of the pilot relief valve, and the output end of the second control switch valve is connected with the oil tank through the second control relief valve; The detection component is in communication connection with the second control reversing valve, the detection component comprises an inclination sensor arranged on the crane and a force sensor arranged on the winch, and the inclination sensor and the force sensor are connected with the control end of the second control reversing valve through a terminal processor; when the crane is operated to lift a load, at this time, the crane is in a rope collecting state, the inclination sensor detects the working radius of the crane, and the force sensor detects the tension of the steel wire rope in the rope collecting state, so that the terminal processor calculates the current overturning moment of the crane according to the working radius of the crane and the tension of the steel wire rope, and compares the current overturning moment of the crane with a pre-set overturning moment, when the current overturning moment of the crane exceeds the pre-set overturning moment, the terminal processor drives the second control valve to reverse and makes the A end communicate with the P end, the oil tank outputs hydraulic oil to the control end of the second control switch valve through the second control reversing valve, the second control switch valve reverses and communicates the first port and the second port of the second control switch valve, so that the control hydraulic oil of the control oil circuit of the pilot relief valve flows back to the oil tank through the second control relief valve, so that the adjusting pressure of the pilot relief valve is lowered, the oil tank outputs hydraulic oil from the oil return pipeline to the motor and forms a circulation through the oil inlet pipeline to return to the oil tank, so that the rope is released; a pressure regulator is further arranged at the control end of the second control relief valve, and the pressure regulator is in communication connection with the terminal processor.

2. An automatic protection system for winch overload according to claim 1, characterized in that: A second switch valve is arranged between the oil inlet end of the pilot relief valve and the oil inlet pipeline, the first port of the second switch valve is connected with the oil inlet pipeline, and the second port of the second switch valve is connected with the oil inlet end of the pilot relief valve.

3. An automatic protection system for winch overload according to claim 1, characterized in that: A balance valve group is arranged on the oil inlet pipeline, the balance valve group comprises a balance relief valve and a balance check valve, the oil inlet end of the balance relief valve is connected with the first port of the motor through the oil inlet pipeline, the oil outlet end of the balance relief valve is connected with the hydraulic pump through the oil inlet pipeline, the oil inlet end of the balance check valve is connected with the oil outlet end of the balance relief valve, and the oil outlet end of the balance check valve is connected with the oil inlet end of the balance relief valve.

4. An automatic protection system for winch overload according to claim 1, characterized in that: A brake valve is further arranged on the motor, a control end of the brake valve is connected with an oil inlet pipeline and an oil outlet pipeline through a brake reversing valve, a P end of the brake reversing valve is connected with an oil tank, an A end of the brake reversing valve is connected with the control end of the brake valve, and a control end of the brake reversing valve is connected with the oil inlet pipeline and the oil outlet pipeline.

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