Hydraulic control system of double winches

Abstract

The invention provides a double-winch hydraulic control system which comprises 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 a motor and a second motor to rotate, the winch control system comprises a first oil way and a second oil way, the first oil way drives the motor to rotate, and the second oil way drives the motor to rotate. The second oil way drives the second motor to rotate; the first oil way comprises a first middle-position unloading valve and a first operating valve, the second oil way comprises a second middle-position unloading valve and a second operating valve, and a first unloading shuttle valve is arranged between the first oil way and the second oil way; according to the structure, when one winch needs to be started, unloading oil ways of the two winches are closed, and full-load operation of the winches can be conducted.

Description

Technical Field

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

[0002] Generally, there are multiple winches on a ship, each winch shares a hydraulic pump module, and each winch is equipped with a control module and a hydraulic motor module. Since the load of each winch is different, the flow rate required to be output by each hydraulic motor module is also different. In order to ensure that the winch with the largest load can work normally, the constant pressure variable pump in the hydraulic pump module will always work under high pressure, which is easy to cause a lot of 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. The document can further reduce the energy consumption of 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 realize low-pressure circulation of hydraulic oil when the winch is on standby while the metering pump always maintains high-pressure oil supply, which easily leads 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 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 can circulate the hydraulic oil circuit at low pressure 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 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 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 the 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 the 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 mid-position unloading valve is arranged between the first oil inlet pipeline and the first oil return pipeline, the oil inlet end of the first mid-position unloading valve is connected to the first oil inlet pipeline, the oil outlet end of the first mid-position unloading valve is connected to the first oil return pipeline, and the first control end of the first mid-position 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 mid-position unloading valve, and 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.

[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, 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, and when the second 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.

[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 first control valve is controlled to be switched to drive the motor to rotate, 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 arranged 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 switched, 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 switched, the P1 end is connected to the P end and the T end is connected to the T1 end 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 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 normally supplied 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.

[0011] To drive the second motor to rotate, the second control valve is controlled to switch, 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 forward rotation of the second motor, 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 reverse rotation of the second motor, thereby realizing the control of the second motor. Since a second mid-position unloading valve is arranged 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 switched, 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; when the second control valve is switched, 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, thereby allowing the hydraulic oil flowing from the hydraulic pump station to the P end of the second control valve to flow to the second control end of the second center unloading valve through the P1 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 unload 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, thereby allowing the hydraulic oil to 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 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 to the third port or the second port is connected to 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 to disconnect the oil inlet end and the oil outlet end of the first mid-position unloading valve.

[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 end and the oil outlet end of the second mid-position unloading valve are disconnected.

[0015] The above arrangement overcomes the pressure of the hydraulic oil flowing into the first control end of the mid-position 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 of the mid-position unloading valve are disconnected, and preventing the hydraulic oil from flowing back from the mid-position unloading valve to the oil tank when the oil circuit is working normally. 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, 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 mid-position 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] Further, 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, 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.

[0019] 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 other oil circuits.

[0020] 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.

[0021] The above arrangement, 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 the low-pressure circulation of the hydraulic oil, thereby achieving energy saving. 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.

[0022] 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.

[0023] 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.

[0024] 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 pipeline and the second oil inlet pipeline through the oil outlet, and the first oil return pipeline and the second oil return pipeline are connected to the oil tank through the oil return port.

[0025] 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, thereby preventing the winch from stopping suddenly and causing an accident.

[0026] 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; 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.

[0027] The above arrangement, by providing the second unloading shuttle valve and the third unloading 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 first unloading shuttle valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a hydraulic schematic diagram of the control system of the present invention.

[0029] Figure 2 It is a connection diagram of the first oil circuit and the hydraulic pump station of the present invention.

[0030] Figure 3 It is a schematic diagram of the first oil circuit of the present invention.

[0031] 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.

[0032] Figure 5 It is a schematic diagram of the second oil circuit of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] 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, wherein 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, wherein the first oil circuit 201 drives the motor 3 to rotate, and the second oil circuit 202 drives the second motor 4 to rotate.

[0035] 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 pipeline 12, the T end of the first control valve 22 is connected to the oil return port 14 of the hydraulic pump station 1 through the first oil return pipeline 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.

[0036] 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 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.

[0037] like Figure 1 and Figure 5 As 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.

[0038] A second mid-position unloading valve 51 is provided between the second oil inlet pipeline 101 and the second oil return pipeline 102, wherein 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 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.

[0039] 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.

[0040] 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 end and the oil outlet end of the first mid-position unloading valve 21 are disconnected.

[0041] 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 end and the oil outlet end of the second mid-position unloading valve 51 are disconnected.

[0042] 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.

[0043] like Figure 3 and Figure 4 As 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, the first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, the second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and the 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.

[0044] 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.

[0045] like Figure 5 As shown, a second shuttle valve 53 is provided between the P1 end and the T1 end of the second control valve 52 and the second control end 512 of the second mid-position 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 mid-position unloading valve 51. In this embodiment, the working principle of the second shuttle valve 53 is the same as that of the first shuttle valve 23.

[0046] 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; 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, 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.

[0047] 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.

[0048] 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 end 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 end 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 on standby, the first relief valve 24 is normally open when power is off, so that the hydraulic oil is unloaded and pressure is reduced through the first relief valve 24 to achieve low-pressure circulation of the hydraulic oil, thereby achieving energy saving. When the winch is working, the first relief valve 24 is powered on and closed, so that the hydraulic oil is pressurized and enters the motor to work. 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, and the second relief valve 64 has the same structure and working principle as the first relief valve 24.

[0049] The first oil inlet pipeline 12 is also provided with a first pressure reducing valve 25, 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. Through the provision of the first pressure reducing valve 25, the oil pressure of the oil circuit can be set, which is convenient for controlling the winch. In this embodiment, a second pressure reducing valve 65 is also provided on the second oil inlet pipeline 101, and the structure and working principle of the second pressure reducing valve 65 are the same as those of the first pressure reducing valve 25.

[0050] 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 inlet ends of the first oil pump 116 and the second oil pump 17 are connected to the oil tank 15, and the oil outlet ends of the first oil pump 16 and the second oil pump 17 are connected to the first oil inlet pipeline 12 and the second oil inlet pipeline 101 through the oil outlet 11. The first oil return pipeline 13 and the second oil return pipeline 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 quantitative pumps. By setting up quantitative pumps, it is ensured that the winch can work under the state of maximum load. By setting up 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 run at half load to prevent the winch from stopping suddenly and causing an accident.

[0051] 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; 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.

[0052] The above arrangement, by providing the second unloading shuttle valve 7 and the third unloading shuttle valve 8 , prevents the hydraulic oils flowing into the first unloading shuttle valve 6 from the P1 end and the T1 end of the first control valve 22 and the second control valve 52 from conflicting with each other.

[0053] Working principle of the present invention: The motor and the second motor are supplied with oil through the hydraulic pump station. When the winch is to be started, the first control valve is controlled to be switched to drive the motor to rotate, 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 mid-position unloading valve is arranged 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 switched, the hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid-position unloading valve, so that the first mid-position unloading valve is connected, and the hydraulic oil can be unloaded through the first mid-position unloading valve and flow back to the hydraulic pump station; 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, 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 P1 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.

[0054] To drive the second motor to rotate, the second control valve is controlled to switch, 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 forward rotation of the second motor, 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 reverse rotation of the second motor, thereby realizing the control of the second motor. Since a second mid-position unloading valve is arranged 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 switched, 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; when the second control valve is switched, 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, thereby allowing the hydraulic oil flowing from the hydraulic pump station to the P end of the second control valve to flow to the second control end of the second center unloading valve through the P1 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 unload 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, thereby allowing the hydraulic oil to flow normally to the second motor to operate.

[0055] 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 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 to the third port or the second port is connected to 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 comprises 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 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 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 mid-position unloading valve is provided between the first oil inlet pipeline and the first oil return pipeline, the oil inlet end of the first mid-position unloading valve is connected to the first oil inlet pipeline, the oil outlet end of the first mid-position unloading valve is connected to the first oil return pipeline, and the first control end of the first mid-position 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 mid-position unloading valve, and 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; 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 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, and when the second 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 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. A hydraulic control system for a double winch according to claim 1, characterized in that: A spring is also 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 end and the oil outlet end of the first mid-position unloading valve are disconnected; 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 end and the oil outlet end of the second mid-position unloading valve are disconnected.

3. A hydraulic control system for a double winch according to claim 1, characterized in that: 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 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; 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.

4. A hydraulic control system for a double winch according to claim 3, 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.

5. 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.

6. A 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.

7. 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, wherein 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 pipeline and the second oil inlet pipeline through the oil outlet, and the first oil return pipeline and the second oil return pipeline are connected to the oil tank through the oil return port.

8. 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 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 valve.

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