Control method of winch overload protection oil way

Abstract

The invention provides a control method for an overload protection oil way of a winch. The detection component is used for detecting the current overturning moment of the crane; when the current overturning moment of the crane exceeds the preset overturning moment; the terminal processor controls the second control reversing valve to reverse, so that the A end is communicated with the P end; control hydraulic oil of control oil ways of the pilot-operated overflow valve and the second pilot-operated overflow valve is subjected to pressure relief through the second control overflow valve and flows back to the oil tank; an oil path between the oil inlet pipeline and the pilot-operated overflow valve and the oil return pipeline is communicated with an oil path between the oil inlet pipeline and the second pilot-operated overflow valve and the oil return pipeline; the oil tank feeds oil to the second control end of the first switch valve through the first shuttle valve, and the first switch valve reverses and controls the first port and the second port to be disconnected; the hydraulic oil cannot flow back to the oil tank from the oil return pipeline, flows to the oil return pipeline through the pilot-operated overflow valve and the second pilot-operated overflow valve and then flows back to the oil inlet pipeline through the motor, and therefore circulation is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of winch control systems, and in particular to a control method for a winch overload protection oil circuit. Background Art

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

[0003] A patent document with Chinese patent application number 202122954349.7 and announcement date 2022.6.7 discloses an overload protection hydraulic system for a winch, including an oil tank, an output valve group, an overload valve group and a regulating valve group, the regulating valve group including a hydraulically controlled reversing valve and a regulating shuttle valve, the P end of the hydraulically controlled reversing valve is connected to a multi-way valve through a three-way valve, and the control port of the hydraulically controlled reversing valve is connected to one end of the regulating shuttle valve; the A end of the hydraulically controlled reversing valve is connected to the output valve group, the T end of the hydraulically controlled reversing valve is connected to the oil tank, and the B end of the hydraulically controlled reversing valve is normally closed; the overload valve group includes an overload sequence valve, one end of the overload sequence valve is connected to the output valve group, and the other end of the overload sequence valve is connected to the third end of the regulating shuttle valve.

[0004] This document detects the pressure in the hydraulic oil circuit through a sequential valve. It only detects the oil pressure in the hydraulic oil circuit, but cannot detect it according to the current state of the crane. In this way, it cannot ensure whether the overturning moment of the crane is within a safe range, and it is difficult to ensure that the crane can quickly abandon the rope when it accidentally hooks a heavy object that cannot be pulled up. When the hook hooks other heavy objects, it is impossible to quickly release the rope through multiple oil circuits. Summary of the invention

[0005] The present invention provides a control method for a winch overload protection oil circuit, which detects the overturning moment of the crane to ensure that the overturning moment of the crane is within a safe range, thereby enabling rapid formation of an internal circulation oil circuit, ensuring rapid rope release while also ensuring stability of the hydraulic oil circuit, and by providing a plurality of leakage oil circuits, the hydraulic oil can be rapidly discharged in the oil circuit in an emergency, so that the winch can be controlled to quickly loosen the wire rope to achieve emergency rope abandonment.

[0006] To achieve the above object, the technical solution of the present invention is: a control method for a winch overload protection oil circuit, which realizes a quick rope-releasing function in a rope-releasing state and a stop rope-releasing function in a normal rope-releasing state through a winch control system, and the specific steps include: (1) When the quick rope-releasing function is performed in the rope-retracting state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope-retracting operation.

[0007] (15) When releasing the rope.

[0008] (16) The detection component detects the current overturning moment of the crane.

[0009] (161) The working radius of the crane is detected by means of an inclination sensor.

[0010] (162) The tension of the wire rope in the retracted state is measured by a force sensor.

[0011] (163) The terminal processor calculates the current overturning moment of the crane based on the working radius of the crane and the tension of the wire rope.

[0012] (17) When the current overturning moment of the crane exceeds the pre-set overturning moment.

[0013] (18) The terminal processor controls the second control reversing valve to make the A end and the P end connected.

[0014] (19) The oil tank outputs hydraulic oil to the control end of the second control switch valve through the second control reversing valve, driving the second control switch valve to switch and connect the first port and the second port.

[0015] (110) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the second control relief valve and flows back to the oil tank.

[0016] (2) When the hook accidentally hooks an object that cannot be lifted.

[0017] (21) The first control reversing valve is switched so that the A end is connected to the P end.

[0018] (22) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to switch and connect the first port and the second port.

[0019] (23) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank.

[0020] (3) The oil path between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, and the oil path between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected.

[0021] (4) The oil tank supplies oil to the second control end of the first switch valve through the first shuttle valve, and the first switch valve switches and controls the first port and the second port to be disconnected.

[0022] (5) The hydraulic oil cannot flow back to the oil tank from the return oil pipe, but flows to the return oil pipe through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly abandon the rope.

[0023] (6) If it is necessary to stop releasing the rope during the rope releasing state, the second control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

[0024] The winch control system includes an oil tank, a pilot overflow valve, a first switch valve, a first control valve group, a second control valve group, a first shuttle valve, a detection component and a motor. The oil tank is connected to an oil inlet pipeline, and the oil tank is connected to the oil tank through the first switch valve. A pilot overflow valve and a second pilot overflow valve are provided between the oil inlet pipeline and the oil return pipeline. The oil inlet end of the pilot overflow valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot overflow valve is connected to the oil return pipeline; the oil inlet end of the second pilot overflow valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot overflow valve is connected to the oil return pipeline.

[0025] The above method, when operating to lift a heavy object, is in the rope-retracting state, the oil tank supplies oil to the second control end of the first switch valve, drives the first switch valve to change direction and controls the first port and the second port to be disconnected, thereby making it impossible for the hydraulic oil to flow back to the oil tank from the return oil pipe but to flow to the second port of the motor; at the same time, 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, 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 wire rope, so that it can accurately and reliably evaluate the overturning moment of the crane according to the actual overturning moment of the crane, so that the second control valve can be controlled to change direction according to the actual overturning situation of the crane during the rope-releasing process to achieve rapid rope abandonment, and the crane can be used as a The overturning moment before the crane is lifted is compared with the preset overturning moment. When the current overturning moment of the crane exceeds the preset overturning moment, the terminal processor drives the second control valve to change direction 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 changes direction and connects 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 flow back to the oil tank through the second control relief valve to release pressure, thereby reducing the regulating pressure of the pilot relief valve. 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 discharge pressure of the second control relief valve to increase. Adjust to ensure that the oil pressure of the hydraulic oil is neither too large nor too small, and to ensure that the overturning moment of the crane is within a safe range, so that the internal circulation oil circuit can be quickly formed, ensuring that the rope is quickly released while also ensuring the stability of the hydraulic oil circuit; if the hook is hooked to an object that cannot be unhooked during the rope collection state, the first control reversing valve is manually turned on, the first control reversing valve is switched to connect the A end with the P end, and the oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, so that the first control switch valve is switched and connected to the first port and the second port of the first control switch valve, thereby allowing the control hydraulic oil of the control oil circuit of the pilot relief valve to be depressurized through the first control relief valve and flow back to the oil tank, thereby allowing the pilot relief valve to When the throttle is turned on, the oil pressure in the oil inlet pipe is increased, and the oil pressure in the oil return pipe is increased. When the throttle is turned on, the oil pressure in the oil return pipe is increased, and the oil pressure in the oil return pipe is increased. When the throttle is turned on, the oil pressure in the oil inlet pipe is increased, and the oil pressure in the oil return pipe is increased. When the throttle is turned on, the oil pressure in the oil return pipe is increased, and the oil pressure in the oil return pipe is increased. When the throttle is turned on, the oil pressure in the oil inlet pipe is increased, and the oil pressure in the oil return pipe is increased. When the throttle is turned on, the oil pressure in the oil return pipe is increased, and the oil pressure in the oil return pipe is increased.At the same time, by setting a second pilot relief valve, when it is necessary to increase the circulation speed of the hydraulic oil, the second pilot relief valve is controlled to open, so that the oil inlet pipeline is connected with the oil circuit between the second pilot relief valve and the return oil pipeline; the hydraulic oil flows to the return oil pipeline through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipeline through the motor to achieve circulation. By adding multiple connected oil circuits in the oil inlet pipeline and the oil outlet pipeline, the circulation of the hydraulic oil is accelerated, thereby accelerating the rope release of the winch; when it is necessary to stop the rope release in the rope release state, the second control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank outputs the hydraulic oil to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank, and the three ports of the first shuttle valve are used to realize emergency rope release during rope collection and stop rope release during rope release, and the operation method is simple. ;

[0026] Furthermore, the first control valve group includes a first control switch valve, a first control reversing valve and a first control overflow valve, the P end and T end of the first control reversing valve are connected to the oil tank, the A end of the first control reversing valve is connected to the control end of the first control switch valve, the first port of the first control switch valve is connected to the oil tank through the first control overflow valve, the second port of the first control switch valve is connected to the control oil circuit of the pilot overflow valve, and the overflow pressure of the first control overflow valve is less than the control pressure of the control oil circuit of the pilot overflow valve.

[0027] The second control valve group includes a second control switch 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 second port of the first shuttle valve and the control end of the second control switch valve, the input end of the second control reversing valve is connected to the oil tank, the input end of the second control switch valve is connected to the control oil circuit of the pilot overflow valve and the control oil circuit of the second pilot overflow valve, and the output end of the second control reversing valve is connected to the oil tank through the first control overflow valve; the oil leakage pressure of the first control overflow valve is lower than the oil leakage pressure of the second control overflow valve.

[0028] The detection component is communicatively connected with the second control reversing valve, and 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 a 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 with the terminal processor.

[0029] The second control end of the first switch valve is connected to the A end of the first control reversing valve and the A end of the second control reversing valve through the first shuttle valve, the first port of the first switch valve is connected to the second port of the motor through the return oil pipeline, the second port of the first switch valve is connected to the oil tank through the return oil pipeline, the first control end of the first switch valve connects the first port and the second port of the first switch valve, the second control end of the first switch valve is also connected to the oil tank through the first shuttle valve, the first control end of the first switch valve controls the first port and the second port of the first switch valve to be connected, and the second control end of the first switch valve controls the first port and the second port of the first switch valve to be disconnected.

[0030] The above arrangement connects the hydraulic control circuit to the oil tank, making the hydraulic circuit connection relationship reliable and simple.

[0031] Furthermore, a second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, a first port of the second switch valve is connected to the oil inlet pipeline, and a second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

[0032] The above arrangement, by providing the second switch valve, allows the oil circuit between the oil inlet pipeline and the pilot-operated relief valve to be opened only when the pilot-operated relief valve is needed, thereby facilitating control of the hydraulic system.

[0033] 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.

[0034] The above arrangement, by setting a balancing valve group, makes the hydraulic oil output of the oil inlet pipeline stable.

[0035] Furthermore, a brake valve is provided on the motor, and the control end of the brake valve is connected to the oil inlet pipeline and the oil outlet pipeline through the brake reversing valve, the P end of the brake reversing valve is connected to the oil tank, the A end of the brake reversing valve is connected to the control end of the brake valve, and the control end of the brake reversing valve is connected to the oil inlet pipeline and the oil outlet pipeline.

[0036] The above arrangement connects the oil inlet pipeline and the oil outlet pipeline through the control end of the brake valve reversing valve. When the winch is to be started, the hydraulic oil in the oil inlet pipeline and the oil outlet pipeline flows to the control end of the brake reversing valve and controls the reversal of the brake reversing valve so that the A end is connected to the P end, so that the hydraulic oil output by the oil tank flows to the control end of the brake valve, thereby driving the brake valve to open, facilitating the rotation of the motor.

[0037] Furthermore, a spring is provided on the second control end of the first switch valve, and the hydraulic oil pressure at the second control end plus the pressure of the spring is greater than the hydraulic oil pressure at the first control end of the first switch valve.

[0038] The above arrangement, by setting a spring, ensures that when the first switch valve is to be closed, the hydraulic oil pressure flowing from the oil tank to the second control end of the first switch valve plus the elastic force of the spring overcomes the hydraulic oil pressure at the first control end of the first switch valve, thereby driving the first switch valve to close, so that the hydraulic oil cannot flow back to the oil tank through the return oil pipe.

[0039] Furthermore, the P end and T end of the second control reversing valve are connected to the oil tank, the A end of the second control reversing valve is connected to the control end of the second control switch valve, the first port of the second control switch valve is connected to the oil tank through the second control overflow valve, the first port of the first shuttle valve is connected to the A end of the first control reversing valve and the A end of the second control reversing valve, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the second control end of the first switch valve.

[0040] In the above arrangement, by arranging the first shuttle valve between the second control end of the first switch valve and the A end of the first control reversing valve and the A end of the second control reversing valve, the hydraulic oil flowing to the second control end of the first switch valve through the second control reversing valve and the hydraulic oil flowing from the oil tank to the second control end of the first switch valve will not conflict with each other.

[0041] Furthermore, step (1) specifically includes: (11) the oil tank supplies oil to the oil inlet pipeline through the hydraulic pump.

[0042] (12) The hydraulic oil flows to the first port of the motor through the oil inlet pipe.

[0043] (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate.

[0044] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

[0045] The above settings facilitate the normal rope collection state.

[0046] Furthermore, a third switch valve is provided between the oil inlet end of the second pilot relief valve and the oil inlet pipeline, wherein a first port of the third switch valve is connected to the oil inlet pipeline, and a second port of the third switch valve is connected to the oil inlet end of the pilot relief valve.

[0047] The above arrangement, by providing the third switch valve, allows the oil circuit between the oil inlet pipeline and the second pilot-operated relief valve to be opened only when the second pilot-operated relief valve is needed, thereby facilitating control of the hydraulic system.

[0048] Furthermore, after step (5), the method further includes step (6): if it is necessary to stop releasing the rope in the rope releasing state, the second control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

[0049] The above arrangement can conveniently control the stopping of the rope release through the arrangement of the second control switch valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the hydraulic system of the present invention.

[0051] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0052] Figure 3 for Figure 1 Hydraulic system connection diagram at B in the figure.

[0053] Figure 4 It is a flow chart of the present invention.

[0054] Figure 5 It is the working flow chart of the detection component of the present invention. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] like Figure 1-Figure 3As shown, a control method for a winch overload protection oil circuit is provided, wherein a winch control system is used to realize a function of quickly releasing the rope in a rope releasing state and a function of stopping releasing the rope in a normal rope releasing state. The winch control system comprises an oil tank 1, a pilot relief valve 2, a first switch valve 3, a motor 4, a second pilot relief valve, a detection component (not shown in the figure), a first control valve group and a second control valve group. A hydraulic pump (not shown in the figure) is provided on the oil tank 1. The hydraulic pump is connected to a first port 41 of the motor 4 through an oil inlet pipeline 11. A second port 42 of the motor 4 is connected to the oil tank 1 through an oil return pipeline 12. A pilot relief valve 2 is provided between the oil inlet pipeline 11 and the oil return pipeline 12. The oil inlet end of the pilot relief valve 2 is connected to the oil inlet pipeline 11. The oil outlet of the pilot relief valve 2 is connected to the oil inlet pipeline 11. an end is connected to an oil return pipeline 12; a first switch valve 3 is provided on the oil return pipeline 12, a first port of the first switch valve 3 is connected to a second port 42 of a motor 4 through the oil return pipeline 12, a second port of the first switch valve 3 is connected to an oil tank 1 through the oil return pipeline 12, a first control end 31 of the first switch valve 3 is connected to a first port and a second port of the first switch valve 3, a second control end 32 of the first switch valve 3 is connected to the oil tank, the first control end 31 of the first switch valve 3 controls the first port and the second port of the first switch valve 3 to be connected, the second control end 32 of the first switch valve 3 controls the first port and the second port of the first switch valve 3 to be disconnected, an oil inlet end of the second pilot-operated relief valve 6 is connected to the oil inlet pipeline 11, and an oil outlet end of the pilot-operated relief valve 6 is connected to the oil return pipeline 12.

[0057] The first control valve group includes a first control switch valve 81, a first control reversing valve 82 and a first control relief valve 83. The P end and the T end of the first control reversing valve 82 are connected to the oil tank 1, the A end of the first control reversing valve 82 is connected to the control end 811 of the first control switch valve 81, the first port of the first control switch valve 81 is connected to the oil tank 1 through the first control relief valve 83, and the second port of the first control switch valve 81 is connected to the control oil circuit 20 of the pilot relief valve 2. The relief pressure of the first control relief valve 83 is less than the control pressure of the control oil circuit 20 of the pilot relief valve 2. In this embodiment, the control end 821 of the first control reversing valve is connected to the control button (not shown in the figure) of the crane cab through an external circuit. When encountering an emergency, the staff in the cab presses the control button to drive the first control reversing valve to achieve reversal.

[0058] The second control valve group includes a second control switch valve 91, a second control reversing valve 92, and a second control relief valve 93. The P end and the 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 relief valve 93, and the second port of the second control switch valve 91 is connected to the control oil circuit 20 of the pilot relief valve 2. The relief pressure of the second control relief valve 93 is less than the control pressure of the control oil circuit 20 of the pilot relief valve 2. The oil leakage pressure of the first control relief valve is less than the oil leakage pressure of the second control relief valve.

[0059] The detection component is connected to the second control reversing valve 92 in communication, and the detection component includes 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 to the control end of the second control reversing valve 92 through a terminal processor; a pressure regulator 931 is also provided at the control end of the second control relief valve 93, and the pressure regulator 931 is connected to the terminal processor in communication. In this embodiment, the terminal processor is a device for processing information such as a PLC or a CPU, which is specifically a prior art and will not be described here.

[0060] A first shuttle valve 84 is provided between the second control end 32 of the first switch valve 3 and the A end of the first control reversing valve 82 and the A end of the second control reversing valve 92, the first port 841 of the first shuttle valve 84 is connected to the A end of the second control reversing valve 92, the second port 842 of the first shuttle valve 84 is connected to the oil tank 1, and the third port 843 of the first shuttle valve 84 is connected to the second control end 32 of the first switch valve 3.

[0061] The first shuttle valve 84 is arranged between the second control end 32 of the first switch valve 3 and the A end of the second control reversing valve 92. When the rope is collected in the normal state, the hydraulic oil of the control oil tank 1 enters the second port 842 of the first shuttle valve 84, and the first port 841 of the first shuttle valve 84 cannot be supplied with oil because the second control switch valve 92 is in the closed state, so that the hydraulic oil in the oil tank 1 enters the second control end 32 of the first switch valve 3 through the second port 842, so that the first switch valve 3 is closed, so that the rope collection operation can be closed when the rope is collected. When emergency rope collection is required, since the second control switch valve 92 is in the conducting state, the hydraulic oil of the oil tank 1 enters the first port 841 of the first shuttle valve 84 through the second control switch valve 92 and then flows into the control end of the first switch valve 3, so that the first switch valve 3 is closed, so that the emergency rope collection is realized. And the hydraulic oil flowing to the second control end 32 of the first switch valve 3 through the second control reversing valve 92 and the hydraulic oil flowing to the second control end 32 of the first switch valve 3 from the oil tank 1 will not conflict with each other.

[0062] A second switch valve 21 is provided between the oil inlet end of the pilot relief valve 2 and the oil inlet pipeline, wherein a first port of the second switch valve 21 is connected to the oil inlet pipeline 11, and a second port of the second switch valve 21 is connected to the oil inlet end of the pilot relief valve 2. By providing the second switch valve 21, the oil circuit between the oil inlet pipeline 11 and the pilot relief valve 2 is opened only when the pilot relief valve 2 is needed, thereby facilitating control of the hydraulic system.

[0063] A third switch valve 61 is provided between the oil inlet end of the second pilot relief valve 6 and the oil inlet pipeline 11, wherein a first port of the third switch valve 61 is connected to the oil inlet pipeline 11, and a second port of the third switch valve 61 is connected to the oil inlet end of the pilot relief valve 6. By providing the third switch valve 61, the oil circuit between the oil inlet pipeline 11 and the second pilot relief valve 6 is opened only when the second pilot relief valve 6 is needed, thereby facilitating control of the hydraulic system.

[0064] A balancing valve group 5 is provided on the oil inlet pipeline 11, and the balancing valve group 5 includes a balancing relief valve 51 and a balancing check valve 52. The oil inlet end of the balancing relief valve 51 is connected to the first port 41 of the motor 4 through the oil inlet pipeline 11, and the oil outlet end of the balancing relief valve 51 is connected to the hydraulic pump through the oil inlet pipeline 11. The oil inlet end of the balancing check valve 52 is connected to the oil outlet end of the balancing relief valve 51, and the oil outlet end of the balancing check valve 52 is connected to the oil inlet end of the balancing relief valve 51. By providing the balancing valve group 5, the hydraulic oil output of the oil inlet pipeline 11 is stable.

[0065] like Figure 1 As shown, a brake valve 43 is also provided on the motor 4, and the control end of the brake valve 43 is connected to the oil inlet pipeline and the oil outlet pipeline through a brake reversing valve 44, the P end of the brake reversing valve 44 is connected to the oil tank, the A end of the brake reversing valve is connected to the control end of the brake valve, and the control end K of the brake reversing valve 44 is connected to the oil inlet pipeline 11 and the oil outlet pipeline 12. The control end K of the brake valve reversing valve 44 is connected to the oil inlet pipeline 11 and the oil outlet pipeline 12. When the winch is to be started, the hydraulic oil in the oil inlet pipeline 11 and the oil outlet pipeline 12 flows to the control end of the brake reversing valve 44 and controls the brake reversing valve 44 to reverse so that the A end is connected to the P end, so that the oil tank 1 outputs the hydraulic oil to flow to the control end of the brake valve 43, thereby driving the brake valve 43 to open, so that the motor 4 rotates.

[0066] like Figure 2As shown, a spring 33 is further provided on the second control end 32 of the first switch valve 3, and the hydraulic oil pressure at the second control end 32 plus the pressure of the spring 33 is greater than the hydraulic oil pressure at the first control end 31 of the first switch valve 3. By providing the spring 33, when the first switch valve 3 is to be closed, the hydraulic oil pressure flowing from the oil tank 1 to the second control end 32 of the first switch valve 3 plus the elastic force of the spring 33 overcomes the hydraulic oil pressure at the first control end 31 of the first switch valve 3, thereby driving the first switch valve 3 to close, so that the hydraulic oil cannot flow back to the oil tank through the return oil pipeline 12.

[0067] like Figure 4-Figure 5 As shown, a control method for a winch overload protection oil circuit comprises the following specific steps: (1) When the quick rope-releasing function is performed in the rope-retracting state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope-retracting operation.

[0068] (11) The oil tank supplies oil to the oil inlet pipe through the hydraulic pump.

[0069] (12) The hydraulic oil flows to the first port of the motor through the oil inlet pipe.

[0070] (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate.

[0071] (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

[0072] (15) When releasing the rope.

[0073] like Figure 5 As shown, (16) the detection component detects the current overturning moment of the crane.

[0074] (161) The working radius of the crane is detected by means of an inclination sensor.

[0075] (162) The tension of the wire rope in the retracted state is measured by a force sensor.

[0076] (163) 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. In this embodiment, the moment is equal to the product of the working radius of the crane and the tension of the wire rope.

[0077] (17) When the current overturning moment of the crane exceeds the pre-set overturning moment.

[0078] (18) The terminal processor controls the second control reversing valve to make the A end and the P end connected.

[0079] (19) The oil tank outputs hydraulic oil to the control end of the second control switch valve through the second control reversing valve, driving the second control switch valve to switch and connect the first port and the second port.

[0080] (110) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the second control relief valve and flows back to the oil tank.

[0081] (2) When the hook accidentally hooks an object that cannot be lifted.

[0082] (21) The first control reversing valve is switched so that the A end is connected to the P end.

[0083] (22) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to switch and connect the first port and the second port.

[0084] (23) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank.

[0085] (3) The oil path between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, and the oil path between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected.

[0086] (4) The oil tank supplies oil to the second control end of the first switch valve through the first shuttle valve, and the first switch valve switches and controls the first port and the second port to be disconnected.

[0087] (5) The hydraulic oil cannot flow back to the oil tank from the return oil pipe, but flows to the return oil pipe through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly abandon the rope.

[0088] (6) If it is necessary to stop releasing the rope during the rope releasing state, the second control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

[0089] In this embodiment, the calculation method of the overturning moment of the crane is the existing technology and will not be repeated here.

[0090] In the normal rope-releasing state, the control end of the first switch valve 3 has no oil intake, so the first control end 31 of the first switch valve 3 intakes oil, so that the first switch valve 3 is turned on. Since the first control switch valve is disconnected, the hydraulic oil of the oil tank 1 cannot be supplied through the first port of the first shuttle valve, and can only be supplied to the control end of the first switch valve 3 through the second port and the third port, so that the first switch valve 3 is closed, so that the hydraulic oil of the oil tank 1 enters the inlet pipe through the motor through the return oil pipe and then enters the oil tank to realize rope releasing. When it is necessary to stop rope releasing, oil is supplied to the second port of the first shuttle valve, so that the oil enters the second control end through the second port and the third port, so that the first switch valve 3 is disconnected, so that the rope-releasing circuit is disconnected to stop rope releasing.

[0091] The working principle of the present invention is as follows: when the rope is being reeled in, the hydraulic oil output by the oil tank 1 enters the oil inlet pipe 11 through the balancing one-way valve 52 and then passes through the motor 4 and the oil return pipe 12 to enter the oil tank 1 for circulation to realize the rope reeling operation. At the same time, a first switch valve 3 is provided on the oil return pipe 12. When the motor 4 rotates normally, the oil tank 1 delivers the hydraulic oil to the motor 4 through the oil inlet pipe 11 and flows into the oil return pipe 12 through the motor 4. The hydraulic oil in the oil return pipe 12 flows to the first control end 31 of the first switch valve 3, thereby driving the first switch valve 3 to reverse and connect the first port and the second port, thereby connecting the oil return pipe 12 with the oil tank, and the hydraulic oil can flow back to the oil tank 1 to realize circulation. When the operation is to lift the heavy object, it is in the rope reeling state, and the oil tank 1 returns to the first control end 31 of the oil return pipe 12. Oil enters the second control end 32 of a switch valve 3, driving the first switch valve 3 to switch and control the first port and the second port to be disconnected, thereby preventing the hydraulic oil from flowing back to the oil tank 1 from the return oil pipe 12 but flowing to the second port 42 of the motor 4; at the same time, 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, 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 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 to switch and connect the A end with the P end, and the oil tank outputs the hydraulic oil to the second control reversing valve 92. The control end 911 of the second control switch valve 91 causes the second control switch valve 91 to switch and connect the first port and the second port of the second control switch valve 91, thereby causing the control hydraulic oil of the control oil circuit 20 of the pilot relief valve 2 to release pressure through the first control relief valve 83 and flow back to the oil tank, thereby reducing the regulating pressure of the pilot relief valve 2. 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 discharge pressure of the second control relief valve to adjust, ensuring that the oil pressure of the hydraulic oil is neither too large nor too small, and ensuring that the overturning moment of the crane can be within a safe range, thereby realizing the rapid formation of the internal circulation oil circuit, ensuring rapid rope release while also ensuring the stability of the hydraulic oil circuit; if the hook is in the rope-collecting state When hooking an object that cannot be unhooked, the first control reversing valve is manually turned on, and the first control reversing valve 82 is switched to connect the A end with the P end, and the oil tank outputs hydraulic oil to the control end 811 of the first control switch valve 81 through the first control reversing valve 82, so that the first control switch valve 81 is switched and connected to the first port and the second port of the first control switch valve 81, thereby making the control hydraulic oil of the control oil circuit 20 of the pilot relief valve 2 flow back to the oil tank through the first control relief valve 83 to release pressure, thereby making the regulating pressure of the pilot relief valve 2 lower, because the oil leakage pressure of the first control relief valve is less than the oil leakage pressure of the second control relief valve, therefore, the regulating pressure of the pilot relief valve can be reduced to a greater extent, so that the oil leakage speed of the hydraulic oil circuit is faster;Since the oil pressure in the oil inlet pipe 11 is greater than the regulating pressure of the pilot relief valve 2, the pilot relief valve 2 is driven to open, so that the hydraulic oil in the oil inlet pipe 11 is released to the oil return pipe 12 through the pilot relief valve 2, thereby increasing the oil pressure on the oil return pipe 12, and making the oil pressure at the end of the motor 4 connected to the oil return pipe 12 greater than the oil pressure at the end of the motor connected to the oil inlet pipe 11, and due to the overflow effect of the pilot relief valve 2, a circulation loop is formed between the oil inlet pipe, the oil return pipe and the motor through the pilot relief valve, and the oil tank continues to output hydraulic oil to the oil inlet pipe, thereby increasing the hydraulic oil in the circulation loop, thereby increasing the pressure difference at both ends of the motor 4, and then increasing the speed of the motor 4 to achieve rapid rope release. At the same time, by setting a second pilot relief valve, when it is necessary to increase the circulation speed of the hydraulic oil When the pressure is high, the second pilot relief valve is controlled to open, so that the oil inlet pipeline is connected with the oil circuit between the second pilot relief valve and the return oil pipeline; the hydraulic oil flows to the return oil pipeline through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipeline through the motor to realize circulation. By adding multiple connected oil circuits in the oil inlet pipeline and the oil outlet pipeline, the circulation of the hydraulic oil is accelerated, thereby accelerating the rope release of the winch. When it is necessary to stop the rope release in the rope release state, the first control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank, and the emergency rope release during the rope collection process and the stop of the rope release during the rope release process are realized through the three ports of the first shuttle valve. The operation method is simple. ;

Claims

1. A control method for a winch overload protection oil circuit, which realizes a quick rope-releasing function in a rope-releasing state and a stop rope-releasing function in a normal rope-releasing state through a winch control system, and is characterized in that: The specific steps include: (1) When the quick rope-releasing function is performed in the rope-retracting state, the hydraulic oil in the oil tank flows back to the oil tank through the oil inlet pipe, the motor, the oil return pipe and the first switch valve to realize the rope-retracting operation; (15) When releasing the rope; (16) The detection component detects the current overturning moment of the crane; (161) The working radius of the crane is detected by the inclination sensor; (162) The tension of the wire rope in the rope-retracting state is detected by the force sensor; (163) The terminal processor calculates the current overturning moment of the crane based on the working radius of the crane and the tension of the wire rope; (17) When the current overturning moment of the crane exceeds the preset overturning moment; (18) The terminal processor controls the second control reversing valve to make the A end and the P end connected; (19) The oil tank outputs hydraulic oil to the control end of the second control switch valve through the second control reversing valve, driving the second control switch valve to switch and connect the first port and the second port; (110) The control hydraulic oil in the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the second control relief valve and flows back to the oil tank; (2) When the hook accidentally hooks onto an object that cannot be lifted; (21) The first control reversing valve is switched so that the A end is connected to the P end; (22) The oil tank outputs hydraulic oil to the control end of the first control switch valve through the first control reversing valve, driving the first control switch valve to switch and connect the first port and the second port; (23) The control hydraulic oil of the control oil circuit of the pilot relief valve and the second pilot relief valve is depressurized through the first control relief valve and flows back to the oil tank; (3) The oil circuit between the oil inlet pipeline and the pilot relief valve and the oil return pipeline, and the oil circuit between the oil inlet pipeline and the second pilot relief valve and the oil return pipeline are connected; (4) The oil tank supplies oil to the second control end of the first switch valve through the first shuttle valve, and the first switch valve switches and controls the first port and the second port to be disconnected; (5) The hydraulic oil cannot flow back to the oil tank from the return oil pipe, but flows to the return oil pipe through the pilot relief valve and the second pilot relief valve, and then flows back to the oil inlet pipe through the motor to achieve circulation, driving the winch to quickly abandon the rope; The winch control system includes an oil tank, a pilot overflow valve, a first switch valve, a first control valve group, a second control valve group, a first shuttle valve, a detection component and a motor. The oil tank is connected to an oil inlet pipeline, and the oil tank is connected to the oil tank through the first switch valve. A pilot overflow valve and a second pilot overflow valve are provided between the oil inlet pipeline and the oil return pipeline. The oil inlet end of the pilot overflow valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot overflow valve is connected to the oil return pipeline; the oil inlet end of the second pilot overflow valve is connected to the oil inlet pipeline, and the oil outlet end of the pilot overflow valve is connected to the oil return pipeline.

2. A control method for a winch overload protection oil circuit according to claim 1, characterized in that: The first control valve group includes a first control switch valve, a first control reversing valve and a first control relief valve, the P end and the T end of the first control reversing valve are connected to the oil tank, the A end of the first control reversing valve is connected to the control end of the first control switch valve, the first port of the first control switch valve is connected to the oil tank through the first control relief valve, the second port of the first control switch valve is connected to the control oil circuit of the pilot relief valve, and the relief pressure of the first control relief valve is less than the control pressure of the control oil circuit of the pilot relief valve; The second control valve group includes 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 to the second port of the first shuttle valve and the control end of the second control switch valve, the input end of the second control reversing valve is connected to the oil tank, the input end of the second control switch valve is connected to the control oil circuit of the pilot relief valve and the control oil circuit of the second pilot relief valve, and the output end of the second control reversing valve is connected to the oil tank through the first control relief valve; the oil leakage pressure of the first control relief valve is less than the oil leakage pressure of the second control relief valve; The detection component is connected to the second control reversing valve in communication, and the detection component includes 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 to the control end of the second control reversing valve through a terminal processor; a pressure regulator is also provided at the control end of the second control relief valve, and the pressure regulator is connected to the terminal processor in communication; The second control end of the first switch valve is connected to the A end of the first control reversing valve and the A end of the second control reversing valve through the first shuttle valve, the first port of the first switch valve is connected to the second port of the motor through the return oil pipeline, the second port of the first switch valve is connected to the oil tank through the return oil pipeline, the first control end of the first switch valve connects the first port and the second port of the first switch valve, the second control end of the first switch valve is also connected to the oil tank through the first shuttle valve, the first control end of the first switch valve controls the first port and the second port of the first switch valve to be connected, and the second control end of the first switch valve controls the first port and the second port of the first switch valve to be disconnected.

3. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: A second switch valve is provided between the oil inlet end of the pilot relief valve and the oil inlet pipeline, a first port of the second switch valve is connected to the oil inlet pipeline, and a second port of the second switch valve is connected to the oil inlet end of the pilot relief valve.

4. A method for controlling a winch overload protection oil circuit 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.

5. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: A brake valve is also provided on the motor, and the control end of the brake valve is connected to the oil inlet pipeline and the oil outlet pipeline through the brake reversing valve. The P end of the brake reversing valve is connected to the oil tank, and the A end of the brake reversing valve is connected to the control end of the brake valve. The control end of the brake reversing valve is connected to the oil inlet pipeline and the oil outlet pipeline.

6. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: A spring is also provided on the second control end of the first switch valve, and the hydraulic oil pressure at the second control end plus the pressure of the spring is greater than the hydraulic oil pressure at the first control end of the first switch valve.

7. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: The P end and T end of the second control reversing valve are connected to the oil tank, the A end of the second control reversing valve is connected to the control end of the second control switch valve, the first port of the second control switch valve is connected to the oil tank through the second control overflow valve, the first port of the first shuttle valve is connected to the A end of the first control reversing valve and the A end of the second control reversing valve, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the second control end of the first switch valve.

8. A method for controlling a winch overload protection oil circuit according to claim 7, characterized in that: Step (1) specifically includes: (11) The oil tank supplies oil to the oil inlet pipe through the hydraulic pump; (12) The hydraulic oil flows to the first port of the motor through the oil inlet pipe; (13) The hydraulic oil in the oil return pipeline flows to the first control end of the first switch valve to drive the first port and the second port of the first switch valve to communicate; (14) The hydraulic oil flows into the oil return pipe through the second port of the motor and then flows back to the oil tank through the oil return pipe to circulate and drive the motor to rotate.

9. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: A third switch valve is provided between the oil inlet end of the second pilot relief valve and the oil inlet pipeline, wherein a first port of the third switch valve is connected to the oil inlet pipeline, and a second port of the third switch valve is connected to the oil inlet end of the pilot relief valve.

10. A method for controlling a winch overload protection oil circuit according to claim 1, characterized in that: After step (5), the method further includes step (6): if it is necessary to stop releasing the rope in the rope releasing state, the second control switch valve is controlled to be disconnected, and the hydraulic oil in the oil tank is output to the control end of the first switch valve through the second port and the third port of the first shuttle valve, so that the first switch valve is disconnected, so that the hydraulic oil in the return oil pipeline cannot be disconnected from the oil tank.

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