A winch unloading system

Abstract

The present invention provides a winch unloading system, comprising a hydraulic pump station and a winch control system, wherein the hydraulic pump station supplies oil to the winch control system, and the winch control system drives the motor to rotate, and the winch control system comprises a first mid-position unloading valve and a first control valve, the oil outlet of the hydraulic pump station is connected to the P end of the first control valve through a first oil outlet pipeline, the T end of the first control valve is connected to the return oil outlet of the hydraulic pump station through a first return oil pipeline, the A end of the first control valve is connected to the first port of the motor, and the B end of the first control valve is connected to the second port of the motor, and a first mid-position unloading valve is provided between the first oil inlet pipeline and the first return oil pipeline; with the above structure, when the winch is on standby, the oil supplied by the hydraulic pump station can be unloaded and flow back to the oil tank, thereby ensuring that the oil circuit of the hydraulic system can circulate at low pressure, so that the energy consumption of the hydraulic system is relatively small.

Description

Technical Field

[0001] The present invention relates to the technical field of winch control, and in particular to a winch unloading system. Background Art

[0002] The winch usually adopts a hydraulic system to adjust the speed and direction of the winch. The common hydraulic system usually includes a hydraulic pump module, a control module and a hydraulic motor module. The hydraulic pump station mainly includes a constant pressure variable pump for providing hydraulic energy. The hydraulic motor module mainly includes a winch motor for driving the winch. However, since the winch needs to lift different weights, the load of the winch is also different, and the hydraulic oil flow rate required to be output by each winch motor is also different. In order to ensure that the winch can work normally when the load is the largest, the hydraulic pump needs to always work under high pressure, which can easily cause a large amount of energy loss.

[0003] For example, Chinese patent application number 201710642677.9, published on January 16, 2018, discloses a hydraulic system for a winch, which belongs to the field of hydraulic control. The hydraulic system includes a hydraulic pump module, a hydraulic motor module, and a control module. The hydraulic pump module includes a variable displacement pump and a load-sensing valve. The control module includes a reversing valve and a pressure compensator. Port a of the reversing valve is connected to the variable displacement pump, port b of the reversing valve is connected to the corresponding hydraulic motor module, port c of the reversing valve is connected to the corresponding hydraulic motor module, port d of the reversing valve is connected to the first control port of the pressure compensator and port a of the pressure compensator, respectively, port e of the reversing valve is connected to port c of the pressure compensator and port f of the reversing valve, port g of the reversing valve is connected to the main return port of the hydraulic system, and port b of the pressure compensator is connected to the second control port of the pressure compensator and the second control port of the load-sensing valve, respectively.

[0004] This document can avoid power loss of the hydraulic system. However, when the winch is on standby, the hydraulic oil circuit does not pass through the motor. Since the hydraulic pump of the pump station always needs high-pressure oil supply, this will easily lead to increased energy consumption of the winch. Summary of the Invention

[0005] The present invention provides a winch unloading system. When the winch is on standby, the oil supplied by the hydraulic pump station can be unloaded and flow back to the oil tank, thereby ensuring that the oil circuit of the hydraulic system can circulate at low pressure, making the energy consumption of the hydraulic system smaller.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a winch unloading system, including a hydraulic pump station and a winch control system, the hydraulic pump station supplies oil to the winch control system, the winch control system drives the motor to rotate, the winch control system includes a first mid-position unloading valve and a first control valve, the oil outlet of the hydraulic pump station is connected to the P end of the first control valve through a first oil outlet pipeline, the T end of the first control valve is connected to the return oil port of the hydraulic pump station through a first return oil pipeline, the A end of the first control valve is connected to the first port of the motor, and the B end of the first control valve is connected to the second port of the motor.

[0007] A first center unloading valve is provided between the first oil inlet pipeline and the first oil return pipeline, the oil inlet end of the first center unloading valve is connected to the first oil inlet pipeline, the oil outlet end of the first center unloading valve is connected to the first oil return pipeline, and the first control end of the first center unloading valve is connected to the first oil inlet pipeline; the P1 end and the T1 end of the first control valve are connected to the second control end of the first center unloading valve, and when the first control valve is reversed, the P1 end and the P end are connected and the T end and the T1 end are connected, or the P1 end and the T end are connected and the P end and the T1 end are connected.

[0008] The above structure supplies oil to the motor through the hydraulic pump station to drive the motor. When the winch is to be started, the first control valve is controlled to be reversed, so that the P end of the first control valve is connected to the A end and the B end is connected to the T end to control the motor to rotate forward, or the P end of the first control valve is connected to the B end and the A end is connected to the T end to control the motor to reverse, thereby realizing the control of the motor. Since the first neutral unloading valve is set between the first oil inlet pipeline and the first oil return pipeline, when the hydraulic pump station supplies oil, if the first control valve is not reversed, the hydraulic oil in the first oil inlet pipeline flows into the first control end of the first neutral unloading valve, so that the first neutral unloading valve is connected, and the hydraulic oil can be unloaded through the first neutral unloading valve and flow back to the hydraulic pump station; when the first control valve is reversed, the P1 end is connected to the P end and the T end is connected to the T1 end, or the P End 1 is connected with end T, and end P is connected with end T1, thereby making it possible for the hydraulic oil flowing from the hydraulic pump station to the P end of the first control valve to flow to the second control end of the first center unloading valve through end P1 and end T1. At this time, the hydraulic oil drives the first center unloading valve to disconnect, thereby making it impossible for the hydraulic oil to be unloaded through the first center unloading valve, and the hydraulic oil can be supplied normally and drive the motor to rotate. Thus, through the setting of the first center unloading valve, when the winch is on standby, the first center unloading valve is opened so that the hydraulic oil is unloaded through the first center unloading valve and flows back to the hydraulic pump station to realize low-pressure circulation, thereby ensuring that the energy consumption of the winch is not too large. When the winch needs to work, the hydraulic oil flowing to the first control valve controls the disconnection of the first center unloading valve, thereby making it possible for the hydraulic oil to flow normally to the motor to operate.

[0009] Furthermore, a spring is provided on the second control end of the first mid-position unloading valve, and the spring pushes the internal oil circuit of the first mid-position unloading valve so that the oil inlet and oil outlet of the first mid-position unloading valve are disconnected.

[0010] The above arrangement overcomes the pressure of the hydraulic oil flowing into the first control end of the first center unloading valve by adding the hydraulic oil pressure of the spring to the second control end, thereby ensuring that the oil inlet and oil outlet ends of the first center unloading valve are disconnected, preventing the hydraulic oil from flowing back from the first center unloading valve to the oil tank when the oil circuit is working normally.

[0011] Furthermore, a first shuttle valve is provided between the P1 end and the T1 end of the first control valve and the second control end of the first mid-position unloading valve, the first port of the first shuttle valve is connected to the P1 end of the first control valve, the second port of the first shuttle valve is connected to the T1 end of the first control valve, and the third port of the first shuttle valve is connected to the second control end of the first mid-position unloading valve.

[0012] The above arrangement, by providing the first shuttle valve, prevents the hydraulic oils from the P1 end and the T1 end of the first control valve from flowing into the second control end of the first mid-position unloading valve from conflicting with each other.

[0013] Furthermore, a first overflow valve is provided between the second control end of the first mid-position unloading valve and the first oil return pipeline, the oil inlet end of the first overflow valve is connected to the second control end of the first mid-position unloading valve, and the oil outlet end of the first overflow valve is connected to the first oil return pipeline.

[0014] The above setting, by setting the first relief valve, when the winch is on standby, the first relief valve is normally open when power is off, so that the hydraulic oil is unloaded and the pressure is reduced through the first relief valve to realize low-pressure circulation of the hydraulic oil, thereby saving energy. When the winch is working, the first relief valve is powered on and closed, so that the hydraulic oil is pressurized and enters the motor to work.

[0015] Furthermore, a first pressure reducing valve is provided in the first oil inlet pipeline, the oil inlet end of the first pressure reducing valve is connected to the oil outlet of the hydraulic pump station through the first oil inlet pipeline, and the oil outlet end of the first pressure reducing valve is connected to the P end of the first control valve through the first oil inlet pipeline.

[0016] The above arrangement, through the arrangement of the first pressure reducing valve, enables the oil pressure of the oil circuit to be set, thereby facilitating the control of the winch.

[0017] Furthermore, the hydraulic pump station includes an oil tank, a first oil pump and a second oil pump, the oil inlet ends of the first oil pump and the second oil pump are connected to the oil tank, the oil outlet ends of the first oil pump and the second oil pump are connected to the first oil inlet pipe through the oil outlet, and the first oil return pipe is connected to the oil tank through the oil return port.

[0018] The above arrangement, by providing two oil pumps, enables the winch to operate at full load, and if one of the oil pumps fails to work, the other oil pump can drive the winch to operate at half load, preventing accidents caused by sudden stop of the winch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a hydraulic schematic diagram of the unloading system of the present invention.

[0020] Figure 2 It is a hydraulic schematic diagram of the winch control system of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 2 As shown, a winch unloading system includes a hydraulic pump station 1 and a winch control system 2. The hydraulic pump station 1 supplies oil to the winch control system 2, and the winch control system 2 drives the motor 3 to rotate. The winch control system 2 includes a first neutral unloading valve 21 and a first control valve 22. The oil outlet 11 of the hydraulic pump station 1 is connected to the P end of the first control valve 22 through a first oil outlet pipe 12, and the T end of the first control valve 22 is connected to the oil return port 14 of the hydraulic pump station 1 through a first oil return pipe 13. The A end of the first control valve 22 is connected to the first port A1 of the motor 3, and the B end of the first control valve 22 is connected to the second port B1 of the motor 3.

[0023] like Figure 2 As shown, a first mid-position unloading valve 21 is provided between the first oil inlet pipeline 12 and the first oil return pipeline 13, the oil inlet end of the first mid-position unloading valve 21 is connected to the first oil inlet pipeline 12, the oil outlet end of the first mid-position unloading valve 21 is connected to the first oil return pipeline 13, and the first control end 211 of the first mid-position unloading valve 21 is connected to the first oil inlet pipeline 12; the P1 end and the T1 end of the first control valve 22 are connected to the second control end 212 of the first mid-position unloading valve 21, and when the first control valve 22 is switched, the P1 end and the P end are connected and the T end and the T1 end are connected, or the P1 end and the T end are connected and the P end and the T1 end are connected.

[0024] A spring 213 is also provided on the second control end 212 of the first center unloading valve 21. The spring 213 pushes the internal oil circuit of the first center unloading valve 21, disconnecting the oil inlet and outlet of the first center unloading valve 21. The spring 213 plus the hydraulic oil pressure at the second control end 212 overcomes the pressure of the hydraulic oil flowing into the first control end 211 of the first center unloading valve 21, thereby ensuring that the oil inlet and outlet of the first center unloading valve 21 are disconnected, preventing hydraulic oil from flowing back from the first center unloading valve 21 to the fuel tank when the oil circuit is functioning normally.

[0025] A first shuttle valve 23 is provided between the P1 and T1 ends of the first control valve 22 and the second control end 212 of the first center unloading valve 21. A first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first center unloading valve 21. The provision of the first shuttle valve 23 prevents the hydraulic oil from the P1 and T1 ends of the first control valve 22 from conflicting with each other when flowing into the second control end 212 of the first center unloading valve 21.

[0026] A first relief valve 24 is provided between the second control end 212 of the first mid-position unloading valve 21 and the first oil return pipe 13. The oil inlet of the first relief valve 24 is connected to the second control end 212 of the first mid-position unloading valve 21, and the oil outlet of the first relief valve 24 is connected to the first oil return pipe 13. By providing the first relief valve 24, when the winch is in standby mode, the first relief valve 24 is de-energized and remains open, allowing the hydraulic oil to be unloaded and reduced in pressure through the first relief valve 24, achieving low-pressure circulation of the hydraulic oil and thus saving energy. When the winch is operating, the first relief valve 24 is energized and closed, allowing the hydraulic oil to be pressurized and enter the motor for operation.

[0027] A first pressure reducing valve 25 is also provided in the first oil inlet pipeline 12. The oil inlet end of the first pressure reducing valve 25 is connected to the oil outlet of the hydraulic pump station through the first oil inlet pipeline 12, and the oil outlet end of the first pressure reducing valve 25 is connected to the P end of the first control valve 22 through the first oil inlet pipeline 12. The provision of the first pressure reducing valve 25 allows the oil pressure of the oil circuit to be adjusted, facilitating the control of the winch.

[0028] like Figure 1 As shown, the hydraulic pump station 1 includes an oil tank 15, a first oil pump 16, and a second oil pump 17. The oil inlets of the first oil pump 116 and the second oil pump 17 are connected to the oil tank 15, and the oil outlets of the first oil pump 16 and the second oil pump 17 are connected to the first oil inlet pipe 12 through the oil outlet 11. The first oil return pipe 13 is connected to the oil tank 15 through the oil return port 14. The first oil pump 16 and the second oil pump 17 are fixed-displacement pumps. By providing fixed-displacement pumps, it is ensured that the winch can operate under the maximum load. By providing two oil pumps, the winch can be operated at full load. If one of the oil pumps fails and cannot work, the other oil pump can drive the winch to operate at half load, preventing the winch from stopping suddenly and causing an accident.

[0029] The working principle of the present invention is as follows: the motor 3 is driven by the hydraulic pump station 1 to supply oil to the motor 3. When the winch is to be started, the first control valve 22 is controlled to be reversed, so that the P end of the first control valve 22 is connected to the A end and the B end is connected to the T end to control the motor 3 to rotate forward, or the P end of the first control valve 22 is connected to the B end and the A end is connected to the T end to control the motor 3 to reverse, thereby realizing the control of the motor 3. Since the first center unloading valve 21 is set between the first oil inlet pipeline 12 and the first oil return pipeline 13, when the hydraulic pump station 1 supplies oil, if the first control valve 22 is not reversed, the hydraulic oil in the first oil inlet pipeline 12 flows into the first control end 211 of the first center unloading valve 21, so that the first center unloading valve 21 is connected, and the hydraulic oil can pass through the first center unloading valve 21 and then unload through the first return oil pipe 13 and flow back to the oil tank 15; when the first control valve 22 is reversed, the P1 end and the P end are connected The T end and the T1 end are connected, or the P1 end and the T end are connected, and the P end and the T1 end are connected, so that the hydraulic oil flowing from the hydraulic pump station 1 to the P end of the first control valve 22 can flow to the second control end 212 of the first center unloading valve 21 through the P1 end and the T1 end. At this time, the hydraulic oil drives the first center unloading valve 21 to disconnect, so that the hydraulic oil cannot be unloaded through the first center unloading valve 21, and the hydraulic oil can be supplied normally and drive the motor 3 to rotate. Therefore, through the setting of the first center unloading valve 21, when the winch is on standby, the first center unloading valve 21 is opened so that the hydraulic oil is unloaded through the first center unloading valve 21 and flows back to the oil tank 15 to realize low-pressure circulation, thereby ensuring that the energy consumption of the winch is not too large. When the winch needs to work, the hydraulic oil flowing to the first control valve 22 controls the first center unloading valve 21 to disconnect, so that the hydraulic oil can flow normally to the motor to operate.

Claims

1. A winch unloading system, comprising a hydraulic pump station and a winch control system, wherein the hydraulic pump station supplies oil to the winch control system, and the winch control system drives a motor to rotate, characterized in that: The winch control system includes a first neutral unloading valve and a first control valve, the oil outlet of the hydraulic pump station is connected to the P end of the first control valve through a first oil outlet pipeline, the T end of the first control valve is connected to the oil return port of the hydraulic pump station through a first oil return pipeline, the A end of the first control valve is connected to the first port of the motor, and the B end of the first control valve is connected to the second port of the motor; A first center unloading valve is provided between the first oil inlet pipeline and the first oil return pipeline, wherein the oil inlet end of the first center unloading valve is connected to the first oil inlet pipeline, the oil outlet end of the first center unloading valve is connected to the first oil return pipeline, and the first control end of the first center unloading valve is connected to the first oil inlet pipeline; the P1 end and the T1 end of the first control valve are connected to the second control end of the first center unloading valve; when the first control valve is switched, the P1 end is connected to the P end and the T end is connected to the T1 end, or the P1 end is connected to the T end and the P end is connected to the T1 end; A spring is further provided on the second control end of the first center unloading valve, and the spring pushes the internal oil circuit of the first center unloading valve so that the oil inlet end and the oil outlet end of the first center unloading valve are disconnected; A first shuttle valve is provided between the P1 end and the T1 end of the first control valve and the second control end of the first mid-position unloading valve, wherein a first port of the first shuttle valve is connected to the P1 end of the first control valve, a second port of the first shuttle valve is connected to the T1 end of the first control valve, and a third port of the first shuttle valve is connected to the second control end of the first mid-position unloading valve; A first overflow valve is provided between the second control end of the first mid-position unloading valve and the first oil return pipeline, the oil inlet end of the first overflow valve is connected to the second control end of the first mid-position unloading valve, and the oil outlet end of the first overflow valve is connected to the first oil return pipeline.

2. The winch unloading system according to claim 1, characterized in that: A first pressure reducing valve is also provided in the first oil inlet pipeline. The oil inlet end of the first pressure reducing valve is connected to the oil outlet of the hydraulic pump station through the first oil inlet pipeline, and the oil outlet end of the first pressure reducing valve is connected to the P end of the first control valve through the first oil inlet pipeline.

3. The winch unloading system according to claim 1, characterized in that: The hydraulic pump station includes an oil tank, a first oil pump and a second oil pump, the oil inlets of the first oil pump and the second oil pump are connected to the oil tank, the oil outlets of the first oil pump and the second oil pump are connected to the first oil inlet pipe through the oil outlet, and the first oil return pipe is connected to the oil tank through the oil return port.

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