Automatically-controlled overload protection hydraulic system

Abstract

The utility model provides an automatic control overload protection hydraulic system which comprises a winch control system, the winch control system comprises an oil tank, a driving oil way, a second control valve set, a detection component and a motor, and the driving oil way comprises a pilot overflow valve and a balance valve. The oil tank is connected with a first port and a second port of the motor through an oil inlet pipeline and an oil outlet pipeline, a pilot-operated overflow valve is arranged between the oil inlet pipeline and the oil return pipeline, the oil inlet end of the pilot-operated overflow valve is connected with the oil inlet pipeline, and the oil outlet end of the pilot-operated overflow valve is connected with the oil return pipeline. The balance valve is arranged between the oil inlet end of the pilot overflow valve and the oil inlet pipeline; by means of the structure, the oil drainage pressure of the overflow valve can be adjusted according to the oil drainage pressure currently needed by the crane, and therefore it can be guaranteed that a hydraulic oil way is kept stable, the oil drainage pressure of the overflow valve does not need to be manually adjusted, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of winch control systems, in particular to an automatically controlled overload protection hydraulic system. Background Art

[0002] A winch is a lightweight lifting device that uses a drum-wound wire rope or chain to lift or pull heavy objects. Due to its ease of operation and high load capacity, winches are widely used in marine engineering, shipbuilding, coal mining, docks, mines, roads and bridges, and other fields. In marine environments, a hydraulic control system typically controls the rotation of a hydraulic motor, which then drives the winch to complete the rope reeling and unreeling operations, as well as other winch-related operations.

[0003] In the patent document with Chinese patent application number 202311396506.4 and publication date 2024.04.16, a method for overload protection of a hydraulic oil circuit is disclosed, which records the full load oil pressure value of the winch system running at full load at different openings of the throttle valve; in this way, the oil pressure value of more than 1.1 times the overload can be calculated under the current full load oil pressure value, and the calculation is accurate; the throttle valve amplifies the oil pressure of the oil inlet pipeline in the oil pump and multi-way valve group area, so that the difference between the full load oil pressure value and the overload oil pressure value increases, and then the pressure switch can accurately detect the numerical 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] This document opens the pressure relief valve when an overload is detected. However, like the prior art of this document, the regulating pressure of the pressure relief valve is generally pre-set, and the pressure relief valve is opened when an overload is detected. In this way, if the regulating pressure of the pressure relief valve is at a high level, a high hydraulic oil pressure is required to open the pressure relief valve. If the pressure of the pressure relief valve is to be adjusted, the machine needs to be shut down first, which easily wastes working time and reduces efficiency. Summary of the Invention

[0005] The utility model provides an automatically controlled overload protection hydraulic system, which can adjust the oil relief pressure of the overflow valve according to the oil relief pressure currently required by the crane, and balance the oil pressure, thereby ensuring that the hydraulic oil circuit remains stable, eliminating the need for manual adjustment of the oil relief pressure of the overflow valve, and improving work efficiency.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is: an automatically controlled overload protection hydraulic system, including a winch control system, the winch control system including an oil tank, a drive oil circuit, a second control valve group, a detection component and a motor, the drive oil circuit including a pilot relief valve and a balancing valve, the oil tank is connected to the first port and the second port of the motor through an oil inlet pipe and an oil outlet pipe, a pilot relief valve is provided between the oil inlet pipe and the return oil pipe, the oil inlet end of the pilot relief valve is connected to the oil inlet pipe, the oil outlet end of the pilot relief valve is connected to the return oil pipe, and the balancing valve is arranged between the oil inlet end of the pilot relief valve and the oil inlet pipe.

[0007] The second control valve group includes a second control switching valve, a second control reversing valve and a second control overflow valve. The output end of the second control reversing valve is connected to the control end of the second control switching valve, the output end of the second control reversing valve is connected to the oil tank, the input end of the second control switching valve is connected to the control oil circuit of the pilot overflow valve, and the output end of the second control reversing valve is connected to the oil tank through the second control overflow valve.

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

[0009] In the above structure, when the rope is retracted, the oil tank outputs hydraulic oil into the oil inlet pipe and then passes through the motor and the return oil pipe to the oil tank for circulation to realize the rope retracting operation. When the operation is to lift the heavy object, it is in the rope retracting state. The inclination sensor detects the working radius of the crane, and the force sensor detects the tension of the wire rope in the rope retracting state. The terminal processor calculates the current overturning moment of the crane according to the working radius of the crane and the tension of the 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 connect the A end 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, so that the second control switch valve is reversed and connected to the first port and the second port of the second control switch valve, thereby causing the control hydraulic oil of the control oil circuit of the pilot relief valve to be depressurized and flow back to the oil tank through the second control relief valve, thereby causing the adjustment pressure of the pilot relief valve to become lower. At this time, the oil tank is The return oil pipeline outputs hydraulic oil to the motor and flows back to the tank through the oil inlet pipeline, forming a circulation to achieve rope release. A portion of the hydraulic oil in the oil inlet pipeline flows to the return oil pipeline through the pilot relief valve. As a result, the hydraulic oil pressure in the return oil pipeline becomes higher, and the hydraulic oil can quickly flow into the motor and return to the tank through the oil inlet pipeline, thereby accelerating the speed of hydraulic oil circulation in the motor, ensuring that the winch can quickly release the rope and prevent the winch from pulling heavy objects hard and damaging the crane structure. At the same time, the terminal processor controls the pressure regulator in real time according to the overturning moment of the crane, thereby driving the second control relief valve to adjust the discharge pressure, ensuring that the regulated pressure of the pilot relief valve is within the control range, ensuring that the hydraulic oil pressure is neither too high nor too low, and ensuring that the overturning moment of the crane is within a safe range. This allows the hydraulic oil in the oil inlet pipeline to flow to the return oil pipeline, ensuring rapid rope release while also maintaining the stability of the hydraulic oil circuit. By providing a balancing valve between the pilot relief valve and the oil inlet pipeline, the balancing valve can balance the stability of the output oil pressure on the oil inlet pipeline.

[0010] Furthermore, a second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, the first port of the second switch valve is connected to the oil inlet pipeline, and the second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

[0011] The above arrangement, by providing the second switch valve, enables the oil circuit between the oil inlet pipe and the pilot-operated relief valve to be opened only when the pilot-operated relief valve is needed, thereby facilitating control of the hydraulic system.

[0012] Furthermore, a balancing valve group is provided on the oil inlet pipeline, and the balancing valve group includes a balancing overflow valve and a balancing check valve. The oil inlet end of the balancing overflow valve is connected to the first port of the motor through the oil inlet pipeline, and the oil outlet end of the balancing overflow valve is connected to the hydraulic pump through the oil inlet pipeline. The oil inlet end of the balancing check valve is connected to the oil outlet end of the balancing overflow valve, and the oil outlet end of the balancing check valve is connected to the oil inlet end of the balancing overflow valve.

[0013] The above setting, by setting a balancing valve group, makes the hydraulic oil output of the oil inlet pipeline stable.

[0014] Furthermore, a brake valve is provided on the motor, and the control end of the brake valve is connected to the oil inlet pipe and the oil outlet pipe through the brake reversing valve. The P end of the brake reversing valve is connected to the oil tank, and the A end of the brake reversing valve is connected to the control end of the brake valve. The control end of the brake reversing valve is connected to the oil inlet pipe and the oil outlet pipe.

[0015] The above setting connects the oil inlet pipe and the oil outlet pipe through the control end of the brake valve reversing valve. When the winch is to be started, the hydraulic oil in the oil inlet pipe and the oil outlet pipe flows to the control end of the brake reversing valve and controls the reversal of the brake reversing valve so that the A end is connected to the P end, so that the hydraulic oil output from the oil tank flows to the control end of the brake valve, thereby driving the brake valve to open, facilitating the rotation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 for Figure 1 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0020] like Figure 1-Figure 3As shown, an automatically controlled overload protection hydraulic system includes a winch control system, which 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 provided on the oil tank 1, and the hydraulic pump is connected to the motor through a drive oil circuit 011. The drive oil circuit 011 includes an oil inlet pipe 11 and an oil return pipe 12. The hydraulic pump is connected to a first port 41 of the motor 4 through the oil inlet pipe 11, and a second port 42 of the motor 4 is connected to the oil tank 1 through the oil return pipe 12. A pilot relief valve 2 is provided between the oil inlet pipe 11 and the oil return pipe 12. The oil inlet end of the pilot relief valve 2 is connected to the oil inlet pipe 11, and the oil outlet end of the pilot relief valve 2 is connected to the oil return pipe 12.

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

[0022] The detection component is communicatively connected to the second control reversing valve 92 and includes an inclination sensor mounted on the crane and a load cell mounted on the winch. The inclination sensor and load cell are connected to the control terminal of the second control reversing valve 92 via a terminal processor. A pressure regulator 931 is also provided at the control terminal of the second control relief valve 93, and the pressure regulator 931 is communicatively connected to the terminal processor. In this embodiment, the terminal processor is a device for processing information, such as a PLC or CPU. The specific details of the terminal processor are conventional and will not be elaborated here.

[0023] A second on-off valve 21 is provided between the oil inlet end of the pilot-operated relief valve 2 and the oil inlet pipeline. A first port of the second on-off valve 21 is connected to the oil inlet pipeline 11, and a second port of the second on-off valve 21 is connected to the oil inlet end of the pilot-operated relief valve 2. The provision of the second on-off valve 21 allows the oil circuit between the oil inlet pipeline 11 and the pilot-operated relief valve 2 to be opened only when the pilot-operated relief valve 2 is needed, thereby facilitating control of the hydraulic system.

[0024] A balancing valve assembly 5 is provided on the oil inlet pipeline 11. The balancing valve assembly 5 includes a balancing relief valve 51 and a balancing check valve 52. The oil inlet end of the balancing relief valve 51 is connected to the first port 41 of the motor 4 via the oil inlet pipeline 11, and the oil outlet end of the balancing relief valve 51 is connected to the hydraulic pump via the oil inlet pipeline 11. The oil inlet end of the balancing check valve 52 is connected to the oil outlet end of the balancing relief valve 51, and the oil outlet end of the balancing check valve 52 is connected to the oil inlet end of the balancing relief valve 51. The provision of the balancing valve assembly 5 ensures a stable output of hydraulic oil from the oil inlet pipeline 11.

[0025] like Figure 1 As shown, a brake valve 43 is also provided on the motor 4. The control end of the brake valve 43 is connected to the oil inlet and oil outlet pipes via a brake reversing valve 44. The P end of the brake reversing valve 44 is connected to the oil tank, the A end of the brake reversing valve is connected to the control end of the brake valve, and the control end K of the brake reversing valve 44 is connected to the oil inlet pipe 11 and the oil outlet pipe 12. The control end K of the brake valve reversing valve 44 is connected to the oil inlet pipe 11 and the oil outlet pipe 12. When the winch is to be started, the hydraulic oil in the oil inlet pipe 11 and the oil outlet pipe 12 flows to the control end of the brake reversing valve 44, and the brake reversing valve 44 is controlled to reverse so that the A end is connected to the P end, thereby causing the hydraulic oil output from the oil tank 1 to flow to the control end of the brake valve 43, thereby driving the brake valve 43 to open, facilitating the rotation of the motor 4.

[0026] The working principle of the present invention is as follows: when the rope is being retracted, the hydraulic oil output by the oil tank 1 enters the oil inlet pipe 11 through the balancing one-way valve 52, then passes through the motor 4 and enters the oil tank 1 through the return oil pipe 12 to circulate and realize the rope retracting operation. When the operation is to lift a heavy object, it is in the rope retracting state. The inclination sensor detects the working radius of the crane, and the force sensor detects the tension of the wire rope in the rope retracting state. The terminal processor calculates the current overturning moment of the crane according to the working radius of the crane and the tension of the wire rope, and compares 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 92 to reverse and connect the A end 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, so that the second control switch valve 91 reverses and connects the first port and the second port of the second control switch valve 91, thereby allowing the control hydraulic oil of the control oil circuit 20 of the pilot-operated relief valve 2 to pass through the first port. The second control relief valve 93 releases pressure and flows back to the oil tank, thereby reducing the regulated pressure of the pilot relief valve 2. At this time, the oil tank outputs hydraulic oil from the return oil pipeline to the motor and flows back to the oil tank through the oil inlet pipeline to form a circulation to achieve rope release. A part of the hydraulic oil in the oil inlet pipeline flows to the return oil pipeline through the pilot relief valve, thereby increasing the hydraulic oil pressure in the return oil pipeline. The hydraulic oil can quickly flow into the motor and return to the oil tank through the oil inlet pipeline, thereby accelerating the speed of the hydraulic oil circulation in the motor, thereby ensuring that the winch can quickly release the rope and ensure that the winch cannot pull heavy objects hard and damage the crane structure. At the same time, the terminal processor controls the pressure regulator in real time according to the overturning moment of the crane, thereby driving the relief pressure of the second control relief valve 93 to adjust, ensuring that the regulated pressure of the pilot relief valve can be within the control range, ensuring that the hydraulic oil pressure is neither too high nor too low, and ensuring that the overturning moment of the crane is within a safe range, thereby enabling the hydraulic oil in the oil inlet pipeline to flow to the return oil pipeline to ensure rapid rope release while also ensuring the stability of the hydraulic oil circuit.

Claims

1. An automatically controlled overload protection hydraulic system, including a winch control system, characterized in that: The winch control system includes an oil tank, a drive oil circuit, a second control valve group, a detection component and a motor. The drive oil circuit includes a pilot relief valve and a balancing valve. The oil tank is connected to the first port and the second port of the motor through an oil inlet pipe and an oil outlet pipe. A pilot relief valve is provided between the oil inlet pipe and the oil return pipe. The oil inlet end of the pilot relief valve is connected to the oil inlet pipe, and the oil outlet end of the pilot relief valve is connected to the oil return pipe. The balancing valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipe. The second control valve group includes a second control switching valve, a second control reversing valve, and a second control relief valve, wherein the output end of the second control reversing valve is connected to the control end of the second control switching valve, the output end of the second control reversing valve is connected to the oil tank, the input end of the second control switching valve is connected to the control oil circuit of the pilot-operated relief valve, and the output end of the second control reversing valve is connected to the oil tank via the second control relief valve; The detection component is communicatively connected to the second control reversing valve. The detection component includes an inclination sensor arranged on the crane and a force sensor arranged on the winch. The inclination sensor and the force sensor are connected to the control end of the second control reversing valve through the terminal processor; a pressure regulator is also provided at the control end of the second control overflow valve, and the pressure regulator is communicatively connected to the terminal processor.

2. The automatic control overload protection hydraulic system according to claim 1, characterized in that: A second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, wherein a first port of the second switch valve is connected to the oil inlet pipeline, and a second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

3. The automatic control overload protection hydraulic system according to claim 1, characterized in that: A balancing valve group is provided on the oil inlet pipeline, and the balancing valve group includes a balancing overflow valve and a balancing check valve. The oil inlet end of the balancing overflow valve is connected to the first port of the motor through the oil inlet pipeline, and the oil outlet end of the balancing overflow valve is connected to the hydraulic pump through the oil inlet pipeline. The oil inlet end of the balancing check valve is connected to the oil outlet end of the balancing overflow valve, and the oil outlet end of the balancing check valve is connected to the oil inlet end of the balancing overflow valve.

4. The automatic control overload protection hydraulic system according to claim 1, characterized in that: A brake valve is also provided on the motor. The control end of the brake valve is connected to the oil inlet pipeline and the oil outlet pipeline through the brake reversing valve. The P end of the brake reversing valve is connected to the oil tank. The A end of the brake reversing valve is connected to the control end of the brake valve. The control end of the brake reversing valve is connected to the oil inlet pipeline and the oil outlet pipeline.

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