A hydraulic control system for a double winch

Abstract

The present invention provides a hydraulic control system for a double winch, 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 and a second motor to rotate, and the winch control system comprises a first oil circuit and a second oil circuit, wherein the first oil circuit drives the motor to rotate, and the second oil circuit drives the second motor to rotate; the first oil circuit comprises a first mid-position unloading valve and a first control valve, and the second oil circuit comprises a second mid-position unloading valve and a second control valve, and a first unloading shuttle valve is provided between the first oil circuit and the second oil circuit; with the above structure, when one winch needs to be started, the unloading oil circuits of the two winches are closed, so that the winches can be operated at full load.

Description

Technical Field

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

[0002] A typical ship is equipped with multiple winches, each sharing a single hydraulic pump module. Each winch is equipped with its own control module and hydraulic motor module. Because each winch has a different load, the required flow rate for each hydraulic motor module also varies. To ensure the most heavily loaded winch can function properly, the constant-pressure variable pump in the hydraulic pump module operates at a constant high pressure, resulting in significant energy loss.

[0003] For example, the patent document with Chinese patent application number 201811457352.4 and publication date 2019.02.12 discloses an electro-hydraulic proportional multi-hydraulic winch control system and its control strategy. The system includes three hydraulic winches and their control systems. This document can further reduce the energy consumption of the centralized pump station type multi-winch hydraulic control and further realize high-precision collaborative operation of multiple winches.

[0004] However, this document does not consider how to achieve low-pressure circulation of hydraulic oil when the winch is on standby while the metering pump always maintains high-pressure oil supply, which can easily lead to increased energy consumption of the winch. In addition, when one winch is working and the other winch is on standby, it can only be simply controlled, and the stability of the oil supply to the working winch cannot be well ensured. Summary of the Invention

[0005] The present invention provides a hydraulic control system for a double winch, which can drive two winches and perform low-pressure circulation of the hydraulic oil circuit when the winches are on standby, thereby reducing the energy consumption of the hydraulic system. At the same time, when one winch needs to be started, the unloading oil circuits of the two winches are closed, so that the winches can be operated at full load, thereby well ensuring the stability of the oil supply to the working winches.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a hydraulic control system for a double winch, 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 and the second motor to rotate, the winch control system includes a first oil circuit and a second oil circuit, the first oil circuit drives the motor to rotate, and the second oil circuit drives the second motor to rotate.

[0007] The first oil circuit includes a first center 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 the first oil outlet pipeline, and the T end of the first control valve is connected to the oil return port of the hydraulic pump station through the 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. 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 return oil 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 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 second oil circuit includes a second mid-position unloading valve and a second control valve. The oil outlet of the hydraulic pump station is connected to the P end of the second control valve through a second oil outlet pipeline, and the T end of the second control valve is connected to the oil return port of the hydraulic pump station through a second oil return pipeline. The A end of the second control valve is connected to the first port of the second motor, and the B end of the second control valve is connected to the second port of the second motor. A second mid-position unloading valve is provided between the second oil inlet pipeline and the second oil return pipeline. The oil inlet end of the second mid-position unloading valve is connected to the second oil inlet pipeline, the oil outlet end of the second mid-position unloading valve is connected to the second oil return pipeline, and the first control end of the second mid-position unloading valve is connected to the second oil inlet pipeline. The P1 end and the T1 end of the second control valve are connected to the second control end of the second mid-position unloading valve. When the second 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.

[0009] A first unloading shuttle valve is provided between the first oil circuit and the second oil circuit, wherein a first port of the first unloading shuttle valve is connected to the P1 end and the T1 end of the first control valve, a second port of the first unloading shuttle valve is connected to the P1 end and the T1 end of the second control valve, and a third port of the first unloading shuttle valve is connected to the second control end of the first mid-position unloading valve and the second control end of the second mid-position unloading valve.

[0010] The above structure supplies oil to the motor and the second motor through the hydraulic pump station. When the winch is to be started, the motor is to be driven to rotate by controlling the first control valve to reverse, 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 center 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 center unloading valve, so that the first center unloading valve is connected, and the hydraulic oil can be unloaded through the first center unloading valve and flow back to the hydraulic pump station; 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 The P1 end and the T end are connected, as well as the P end and the T1 end are connected, so that the hydraulic oil flowing from the hydraulic pump station to the P end of the first control valve can flow to the second control end of the first center unloading valve through the P end and the T1 end. At this time, the hydraulic oil drives the first center unloading valve to disconnect, so that the hydraulic oil cannot be unloaded through the first center unloading valve, and the hydraulic oil can be supplied normally and drive the motor to rotate. Therefore, through the setting of the first center unloading valve, when the winch is on standby, the first center unloading valve is opened to allow the hydraulic oil to be unloaded through the first center unloading valve and flow 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 motor needs to work, the hydraulic oil flowing to the first control valve controls the first center unloading valve to disconnect, so that the hydraulic oil can flow to the motor normally to operate.

[0011] To drive the second motor to rotate, the second control valve is controlled to reverse, so that the P end of the second control valve is connected to the A end and the B end is connected to the T end to control the second 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 second motor to reverse, thereby realizing the control of the second motor. Since a second mid-position unloading valve is set between the second oil inlet pipeline and the second oil return pipeline, when the hydraulic pump station supplies oil, if the second control valve is not reversed, the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve, so that the second mid-position unloading valve is connected, and the hydraulic oil can be unloaded through the second mid-position unloading valve and flow back to the hydraulic pump station; after the second control valve is reversed, the P1 end and the P end are connected and the T end and the T end are connected, or the P1 end and the T end are connected and the P end It is connected to the T1 end, so that the hydraulic oil flowing from the hydraulic pump station to the P end of the second control valve can flow to the second control end of the second center unloading valve through the P end and the T1 end. At this time, the hydraulic oil drives the second center unloading valve to disconnect, so that the hydraulic oil cannot be unloaded through the second center unloading valve, and the hydraulic oil can be supplied normally and drive the second motor to rotate. Therefore, through the setting of the second center unloading valve, when the winch is on standby, the second center unloading valve is opened to allow the hydraulic oil to be unloaded through the second center unloading valve and flow 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 second motor needs to work, the second center unloading valve is controlled to disconnect by the hydraulic oil flowing to the second control valve, so that the hydraulic oil can flow normally to the second motor to operate.

[0012] At the same time, by arranging the first unloading shuttle valve between the first oil circuit and the second oil circuit, when one of the motors is to work and the other motor is on standby, the hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, so that the first port of the first unloading shuttle valve is connected with the third port or the second port is connected with the third port, thereby the hydraulic oil can flow to the second control end of the first center unloading valve and the second control end of the second center unloading valve through the third port of the first unloading shuttle valve, thereby closing the center unloading valve to prevent the hydraulic oil from being unloaded by the center unloading valve when the winch is working, resulting in insufficient oil pressure.

[0013] 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.

[0014] A second spring is also provided on the second control end of the second mid-position unloading valve. The second spring pushes the internal oil circuit of the second mid-position unloading valve so that the oil inlet and oil outlet of the second mid-position unloading valve are disconnected.

[0015] In this arrangement, the hydraulic oil pressure at the second control end, combined with the spring, overcomes the pressure of the hydraulic oil flowing into the first control end of the center unloading valve, thereby ensuring that the oil inlet and outlet of the center unloading valve are disconnected, preventing hydraulic oil from flowing back from the center unloading valve to the tank when the oil circuit is operating normally. Furthermore, a first shuttle valve is provided between the P1 and T1 ends of the first control valve and the second control end of the first center 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 center unloading valve.

[0016] A second shuttle valve is provided between the P1 end and the T1 end of the second control valve and the second control end of the second mid-position unloading valve, wherein the first port of the second shuttle valve is connected to the P1 end of the second control valve, the second port of the second shuttle valve is connected to the T1 end of the second control valve, and the third port of the second shuttle valve is connected to the second control end of the second mid-position unloading valve.

[0017] The above arrangement, by providing the first shuttle valve and the second shuttle valve, prevents the hydraulic oils from the P1 end and the T1 end of the first control valve and the second control valve from conflicting with each other when flowing into the second control end of the neutral unloading valve.

[0018] Furthermore, a third shuttle valve is provided between the second control end of the first mid-position unloading valve and the third port of the first unloading shuttle valve, wherein the first port of the third shuttle valve is connected to the third port of the first shuttle valve, the second port of the third shuttle valve is connected to the third port of the first unloading shuttle valve, and the third port of the third shuttle valve is connected to the second control end of the first mid-position unloading valve;

[0019] A fourth shuttle valve is provided between the second control end of the second mid-position unloading valve and the third port of the first unloading shuttle valve, the first port of the fourth shuttle valve is connected to the third port of the second shuttle valve, the second port of the fourth shuttle valve is connected to the third port of the first unloading shuttle valve, and the third port of the fourth shuttle valve is connected to the second control end of the second mid-position unloading valve.

[0020] The above arrangement, by providing the third shuttle valve and the fourth shuttle valve, prevents the hydraulic oil flowing into the second control terminal of the mid-position unloading valve from conflicting with the hydraulic oil in other oil circuits.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 and the second oil inlet pipe through the oil outlet, and the first oil return pipe and the second oil return pipe are connected to the oil tank through the oil return port.

[0026] 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.

[0027] A second unloading shuttle valve is provided between the first control valve and the first unloading shuttle valve, wherein the first port of the second unloading shuttle valve is connected to the P1 end of the first control valve, the second port of the second unloading shuttle valve is connected to the T1 end of the first control valve, and the third port of the second unloading shuttle valve is connected to the first port of the first unloading valve;

[0028] A third unloading shuttle valve is provided between the second control valve and the first unloading shuttle valve, wherein the first port of the third unloading shuttle valve is connected to the P1 end of the second control valve, the second port of the third unloading shuttle valve is connected to the T1 end of the second control valve, and the third port of the third unloading shuttle valve is connected to the second port of the first unloading valve.

[0029] The above arrangement, by providing the second unloading shuttle valve and the third unloading shuttle valve, prevents the hydraulic oil flowing into the first unloading shuttle valve from the P1 end and the T1 end of the first control valve and the second control valve from conflicting with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a hydraulic schematic diagram of the control system of the present invention.

[0031] Figure 2 This is a schematic diagram of the connection between the first oil circuit and the hydraulic pump station of the present invention.

[0032] Figure 3 Schematic diagram of the first oil circuit of the present invention.

[0033] Figure 4 It is a schematic diagram of the connection between the first oil circuit and the first unloading shuttle valve of the present invention.

[0034] Figure 5 Schematic diagram of the second oil circuit of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 5 As shown, a hydraulic control system of a double winch includes a hydraulic pump station 1 and a winch control system. The hydraulic pump station 1 supplies oil to the winch control system, and the winch control system drives the motor 3 and the second motor 4 to rotate. The winch control system includes a first oil circuit 201 and a second oil circuit 202. The first oil circuit 201 drives the motor 3 to rotate, and the second oil circuit 202 drives the second motor 4 to rotate.

[0037] The first oil circuit 201 includes a first mid-position 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 the first oil outlet pipe 12. The T end of the first control valve 22 is connected to the return oil port 14 of the hydraulic pump station 1 through the first return oil 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.

[0038] 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.

[0039] like Figure 1 and Figure 5As shown, the second oil circuit 202 includes a second mid-position unloading valve 51 and a second control valve 52, the oil outlet 11 of the hydraulic pump station 1 is connected to the P end of the second control valve 52 through the second oil outlet pipeline 101, the T end of the second control valve 52 is connected to the return oil port 14 of the hydraulic pump station through the second return oil pipeline 102, the A end of the second control valve 52 is connected to the first port 41 of the second motor 4, and the B end of the second control valve is connected to the second port 41 of the second motor.

[0040] A second mid-position unloading valve 51 is provided between the second oil inlet pipeline 101 and the second oil return pipeline 102, the oil inlet end of the second mid-position unloading valve 51 is connected to the second oil inlet pipeline 101, the oil outlet end of the second mid-position unloading valve 51 is connected to the second oil return pipeline 102, and the first control end 511 of the second mid-position unloading valve 51 is connected to the second oil inlet pipeline 101; the P1 end and the T1 end of the second control valve 52 are connected to the second control end 512 of the second mid-position unloading valve 51, and when the second control valve 52 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.

[0041] like Figure 1 、 Figure 4 and Figure 5 As shown, a first unloading shuttle valve 6 is provided between the first oil circuit 201 and the second oil circuit 202, the first port 61 of the first unloading shuttle valve 6 is connected to the P1 end and the T1 end of the first control valve 22, the second port 62 of the first unloading shuttle valve 6 is connected to the P1 end and the T1 end of the second control valve 52, and the third port 63 of the first unloading shuttle valve 6 is connected to the second control end 211 of the first mid-position unloading valve 21 and the second control end 511 of the second mid-position unloading valve 51.

[0042] A spring 213 is further provided on the second control end 212 of the first mid-position unloading valve 21 . The spring 213 pushes the internal oil circuit of the first mid-position unloading valve 21 so that the oil inlet and oil outlet of the first mid-position unloading valve 21 are disconnected.

[0043] A second spring 513 is further provided on the second control end 512 of the second mid-position unloading valve 51 . The second spring 513 pushes the internal oil circuit of the second mid-position unloading valve 51 so that the oil inlet and oil outlet of the second mid-position unloading valve 51 are disconnected.

[0044] The pressure of the hydraulic oil flowing into the first control end 211 of the first center unloading valve 21 is overcome by adding the hydraulic oil pressure of the spring 213 to the second control end 212, thereby ensuring that the oil inlet and oil outlet of the first center unloading valve 21 are disconnected, preventing the hydraulic oil from flowing back from the first center unloading valve 21 to the oil tank when the oil circuit is working normally.

[0045] like Figure 3 and Figure 4As shown, a first shuttle valve 23 is provided between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first mid-position unloading valve 21, wherein 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 mid-position unloading valve 21.

[0046] The first shuttle valve 23 is provided to prevent the hydraulic oils from the P1 end and the T1 end of the first control valve 22 from flowing into the second control end 212 of the first mid-position unloading valve 21 from conflicting with each other.

[0047] like Figure 5 As shown, a second shuttle valve 53 is provided between the P1 and T1 ends of the second control valve 52 and the second control end 512 of the second center unloading valve 51. A first port 531 of the second shuttle valve 53 is connected to the P1 end of the second control valve 52, a second port 532 of the second shuttle valve 53 is connected to the T1 end of the second control valve 52, and a third port 533 of the second shuttle valve 53 is connected to the second control end of the second center unloading valve 51. In this embodiment, the operating principle of the second shuttle valve 53 is the same as that of the first shuttle valve 23.

[0048] like Figure 4 As shown, a third shuttle valve 26 is provided between the second control end 212 of the first mid-position unloading valve 21 and the third port 63 of the first unloading shuttle valve 6. The first port 261 of the third shuttle valve 26 is connected to the third port 233 of the first shuttle valve 23, the second port 262 of the third shuttle valve 26 is connected to the third port 63 of the first unloading shuttle valve 6, and the third port 263 of the third shuttle valve 26 is connected to the second control end 212 of the first mid-position unloading valve 21.

[0049] A fourth shuttle valve 66 is provided between the second control end 512 of the second mid-position unloading valve 51 and the third port 63 of the first unloading shuttle valve 6, wherein the first port 661 of the fourth shuttle valve 66 is connected to the third port 533 of the second shuttle valve 53, the second port 662 of the fourth shuttle valve 66 is connected to the third port 63 of the first unloading shuttle valve 6, and the third port 663 of the fourth shuttle valve 66 is connected to the second control end 512 of the second mid-position unloading valve 51.

[0050] The above arrangement, by providing the third shuttle valve 26 and the fourth shuttle valve 66 , prevents the hydraulic oil flowing into the second control terminal of the neutral unloading valve from conflicting with other oil circuits.

[0051] 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 pipeline 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 pipeline 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 pressure reduced 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. In this embodiment, a second relief valve 64 is provided between the second control end 512 of the second mid-position unloading valve 51 and the second oil return pipeline 102. The second relief valve 64 has the same structure and operating principle as the first relief valve 24.

[0052] A first pressure-reducing valve 25 is also provided on the first oil inlet pipeline 12. The oil inlet of the first pressure-reducing valve 25 is connected to the oil outlet of the hydraulic pump station via the first oil inlet pipeline 12, while the oil outlet of the first pressure-reducing valve 25 is connected to the P terminal of the first control valve 22 via the first oil inlet pipeline 12. The provision of the first pressure-reducing valve 25 allows the oil pressure in the oil circuit to be adjusted, facilitating winch control. In this embodiment, a second pressure-reducing valve 65 is also provided on the second oil inlet pipeline 101. The structure and operating principle of the second pressure-reducing valve 65 are identical to those of the first pressure-reducing valve 25.

[0053] 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 and the second oil inlet pipe 101 through the oil outlet 11. The first oil return pipe 13 and the second oil return pipe 102 are 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 state. By providing two oil pumps, the winch can be operated 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 the winch from suddenly stopping and causing an accident.

[0054] like Figure 4 As shown, a second unloading shuttle valve 7 is provided between the first control valve 22 and the first unloading shuttle valve 6. A first port 71 of the second unloading shuttle valve 7 is connected to the P1 end of the first control valve 22, a second port 72 of the second unloading shuttle valve 7 is connected to the T1 end of the first control valve 22, and a third port 73 of the second unloading shuttle valve 7 is connected to the first port 71 of the first unloading valve 6.

[0055] like Figure 5As shown, a third unloading shuttle valve 8 is provided between the second control valve 52 and the first unloading shuttle valve 6, the first port 81 of the third unloading shuttle valve 8 is connected to the P1 end of the second control valve 52, the second port 82 of the third unloading shuttle valve 8 is connected to the T1 end of the second control valve 82, and the third port 83 of the third unloading shuttle valve 8 is connected to the second port 62 of the first unloading valve.

[0056] The above arrangement, by providing the second unloading shuttle valve 7 and the third unloading shuttle valve 8 , prevents the hydraulic oil flowing from the P1 end and the T1 end of the first control valve 22 and the second control valve 52 into the first unloading shuttle valve 6 from conflicting with each other.

[0057] Working principle of the present invention:

[0058] Oil is supplied to the motor and the second motor through the hydraulic pump station. When the winch is to be started, the motor is to be driven to rotate by controlling the first control valve to reverse, 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 center 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 center unloading valve, so that the first center unloading valve is connected, and the hydraulic oil can be unloaded through the first center 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 P1 end is connected to the T end, and the P end is connected to the T1 end, so that the hydraulic oil flowing from the hydraulic pump station to the P end of the first control valve can flow to the second control end of the first center unloading valve through the P end and the T1 end. At this time, the hydraulic oil drives the first center unloading valve to disconnect, so that the hydraulic oil cannot be unloaded through the first center unloading valve, and the hydraulic oil can be supplied normally and drive the motor to rotate. Therefore, through the setting of the first center unloading valve, when the winch is on standby, the first center unloading valve is opened to allow the hydraulic oil to unload through the first center unloading valve and flow 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 motor needs to work, the hydraulic oil flowing to the first control valve controls the first center unloading valve to disconnect, so that the hydraulic oil can flow normally to the motor to operate.

[0059] To drive the second motor to rotate, the second control valve is controlled to reverse, so that the P end of the second control valve is connected to the A end and the B end is connected to the T end to control the second 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 second motor to reverse, thereby realizing the control of the second motor. Since a second mid-position unloading valve is set between the second oil inlet pipeline and the second oil return pipeline, when the hydraulic pump station supplies oil, if the second control valve is not reversed, the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve, so that the second mid-position unloading valve is connected, and the hydraulic oil can be unloaded through the second mid-position unloading valve and flow back to the hydraulic pump station; after the second control valve is reversed, the P1 end and the P end are connected and the T end and the T end are connected, or the P1 end and the T end are connected and the P end It is connected to the T1 end, so that the hydraulic oil flowing from the hydraulic pump station to the P end of the second control valve can flow to the second control end of the second center unloading valve through the P end and the T1 end. At this time, the hydraulic oil drives the second center unloading valve to disconnect, so that the hydraulic oil cannot be unloaded through the second center unloading valve, and the hydraulic oil can be supplied normally and drive the second motor to rotate. Therefore, through the setting of the second center unloading valve, when the winch is on standby, the second center unloading valve is opened to allow the hydraulic oil to be unloaded through the second center unloading valve and flow 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 second motor needs to work, the second center unloading valve is controlled to disconnect by the hydraulic oil flowing to the second control valve, so that the hydraulic oil can flow normally to the second motor to operate.

[0060] At the same time, by arranging the first unloading shuttle valve between the first oil circuit and the second oil circuit, when one of the motors is to work and the other motor is on standby, the hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, so that the first port of the first unloading shuttle valve is connected with the third port or the second port is connected with the third port, thereby the hydraulic oil can flow to the second control end of the first center unloading valve and the second control end of the second center unloading valve through the third port of the first unloading shuttle valve, thereby closing the center unloading valve to prevent the hydraulic oil from being unloaded by the center unloading valve when the winch is working, resulting in insufficient oil pressure.

Claims

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

2. The hydraulic control system of a double winch according to claim 1, characterized in that: A third shuttle valve is provided between the second control end of the first mid-position unloading valve and the third port of the first unloading shuttle valve, wherein the first port of the third shuttle valve is connected to the third port of the first shuttle valve, the second port of the third shuttle valve is connected to the third port of the first unloading shuttle valve, and the third port of the third shuttle valve is connected to the second control end of the first mid-position unloading valve; A fourth shuttle valve is provided between the second control end of the second mid-position unloading valve and the third port of the first unloading shuttle valve, the first port of the fourth shuttle valve is connected to the third port of the second shuttle valve, the second port of the fourth shuttle valve is connected to the third port of the first unloading shuttle valve, and the third port of the fourth shuttle valve is connected to the second control end of the second mid-position unloading valve.

3. The hydraulic control system of a double winch according to claim 1, characterized in that: 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.

4. The hydraulic control system for a double winch 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.

5. The hydraulic control system of a double winch 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 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 and the second oil inlet pipe through the oil outlet, and the first oil return pipe and the second oil return pipe are connected to the oil tank through the oil return port.

6. The hydraulic control system of a double winch according to claim 1, characterized in that: A second unloading shuttle valve is provided between the first control valve and the first unloading shuttle valve, wherein the first port of the second unloading shuttle valve is connected to the P1 end of the first control valve, the second port of the second unloading shuttle valve is connected to the T1 end of the first control valve, and the third port of the second unloading shuttle valve is connected to the first port of the first unloading shuttle valve; A third unloading shuttle valve is provided between the second control valve and the first unloading shuttle valve, wherein the first port of the third unloading shuttle valve is connected to the P1 end of the second control valve, the second port of the third unloading shuttle valve is connected to the T1 end of the second control valve, and the third port of the third unloading shuttle valve is connected to the second port of the first unloading shuttle valve.

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