Oil extraction method of double winches

Abstract

The invention provides an oil extraction method for double winches, which comprises the following specific steps that: (1) a hydraulic pump station supplies oil to a winch control system, and the winch control system drives a motor and a second motor to operate; (10) when one motor is required to work and the other motor is in a standby state; (11) the hydraulic oil flows to a first unloading shuttle valve through the first operating valve or the second operating valve, and a first port of the first unloading shuttle valve is communicated with a third port or a second port of the first unloading shuttle valve is communicated with the third port; (12) the hydraulic oil flows to the second control end of the first middle-position unloading valve and the second control end of the second middle-position unloading valve through a third port of the first unloading shuttle valve; (13) the first middle-position unloading valve and the second middle-position unloading valve are closed, and the hydraulic oil normally flows to the motor needing to work and drives the motor to operate; according to the method, when only one winch needs to be started, the unloading oil way of the standby winch is closed, and therefore it is guaranteed that the hydraulic oil can output enough oil pressure to drive the working winch to act.

Description

Technical Field

[0001] The invention relates to the technical field of winch control, and in particular to an oil extraction method for a double winch. Background Art

[0002] At present, multiple winches are usually configured on offshore platforms to work together or independently, mainly including platform lifting winches, traction winches, tension winches and auxiliary winches, etc. These winches are usually driven by hydraulic systems.

[0003] Among the multiple winches on the offshore platform, some have a higher workload, while others may have a relatively lower workload. Therefore, in order to meet the workload requirements of each winch, a common method is to set up a hydraulic system for each winch, and each hydraulic system drives the corresponding winch to work separately to meet the different load requirements of the winch. However, this will also increase costs. For example, a multi-winch hydraulic system is disclosed in a patent document with Chinese patent application number 201811015785.4 and publication date 2019.01.01, which belongs to the field of hydraulic control technology. The hydraulic system includes a main pump group, three proportional valves, two solenoid valves and three hydraulic motors. Among them, the three proportional valves are three-position six-way valves, and the three proportional valves are set one-to-one with the three hydraulic motors. The proportional valve can control the pressure and flow of the hydraulic oil output by the main pump group and then output it to the corresponding hydraulic motor. The hydraulic motor is used to drive the winch. The two solenoid valves can control the series-parallel connection of the three proportional valves. By changing the series-parallel relationship between the three proportional valves, the main pump group can change the size and sequence of the hydraulic oil provided to the three hydraulic motors, so as to realize the driving of multiple winches according to the priority of the work of multiple winches. Therefore, only one set of hydraulic system is needed to drive multiple winches, which saves the manufacturing cost of the offshore platform, and has a simple structure and is easy to operate.

[0004] The current multi-winch hydraulic system usually uses a hydraulic pump station to drive multiple winches. In order to ensure that each winch can run at full load, a metering pump is required. However, when the motor is not working, the metering pump will still input hydraulic oil into the control system. For example, if a metering pump is applied to the hydraulic system of the above-mentioned document, it does not unload the high-pressure hydraulic oil, which easily causes a large amount of energy loss in the hydraulic oil circuit. Summary of the invention

[0005] The present invention provides an oil extraction method for a double winch, which realizes low-pressure circulation of the hydraulic oil output by a metering pump when the winch is on standby, thereby ensuring the stability of the oil circuit and preventing energy loss; when only one winch is needed to be started, the unloading oil circuit of the standby winch is closed, thereby ensuring that the hydraulic oil can output sufficient oil pressure to drive the working winch to move, preventing the winch from being unable to operate at full load, and the winch can also be pressurized when the winch needs to be accelerated.

[0006] To achieve the above object, the technical solution of the present invention is: a method for extracting oil from a double winch, which is implemented by an unloading system, wherein the unloading system includes 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 specific steps include: (1) The hydraulic pump station supplies oil to the winch control system, which drives the motor and the second motor to operate.

[0007] (10) When one of the motors is required to work and the other motor is required to be on standby.

[0008] (11) The hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, and the first port of the first unloading shuttle valve is connected to the third port or the second port of the first unloading shuttle valve is connected to the third port.

[0009] (12) The hydraulic oil flows through the third port of the first unloading shuttle valve to the second control end of the first center unloading valve and the second control end of the second center unloading valve.

[0010] (13) The first center unloading valve and the second center unloading valve are closed, and the hydraulic oil flows normally to the motor that needs to work and drives the motor to operate.

[0011] (14) When the motor needs to be accelerated, the first manual reversing valve is driven to reverse, connecting the first oil inlet pipe and the motor, and the hydraulic oil flows into the motor through the first manual reversing valve to increase pressure and speed.

[0012] (15) When the speed of the second motor needs to be increased, the second manual reversing valve is driven to reverse, connecting the second oil inlet pipe and the motor, and the hydraulic oil flows into the motor through the second manual reversing valve to increase the pressure and speed.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] The hydraulic pump station includes an oil tank and a metering pump, wherein the oil inlet end of the metering pump is connected to the oil tank, the oil outlet end of the metering pump is 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.

[0018] A first manual reversing valve is provided between the first oil inlet pipeline and the motor. The oil inlet end of the first manual reversing valve is connected to the hydraulic pump station through the first oil inlet pipeline, and the oil outlet end of the first manual reversing valve is connected to the motor.

[0019] A second manual reversing valve is provided between the second oil inlet pipeline and the second motor, the oil inlet end of the second manual reversing valve is connected to the hydraulic pump station through the second oil inlet pipeline, and the oil outlet end of the second manual reversing valve is connected to the second motor.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Furthermore, the metering pump includes 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Furthermore, a third pressure reducing valve is provided on the first oil inlet pipeline, the oil inlet end of the third pressure reducing valve is connected to the first oil inlet pipeline, and the oil outlet end of the third pressure reducing valve is connected to the oil inlet end of the first manual reversing valve.

[0039] The above arrangement, by providing the third pressure reducing valve, enables the pressure of the hydraulic oil delivered to the motor through the first manual reversing valve to be set, thereby facilitating the control of the speed increase of the winch.

[0040] Furthermore, after step (1), the following steps are specifically included: (2) When the winch is on standby.

[0041] (3) The oil passage between the first control valve and the motor and the oil passage between the second control valve and the motor are disconnected.

[0042] (4) The hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid-position unloading valve; the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve; (5) The first center unloading valve is connected, and the hydraulic oil in the first oil inlet pipeline is unloaded through the first center unloading valve and flows back to the hydraulic pump station; the second center unloading valve is connected, and the hydraulic oil in the second oil inlet pipeline is unloaded through the second center unloading valve and flows back to the hydraulic pump station.

[0043] (6) When the winch is turned on.

[0044] (7) The first control valve and the second control valve are switched.

[0045] (71) When it is necessary to control the motor rotation.

[0046] (711) When it is necessary to control the motor to rotate forward, the P end of the first control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end. The hydraulic oil flows into the first port of the motor through the A end of the first control valve and flows back to the oil tank from the second port through the B end of the first control valve; the P1 end of the first control valve is connected to the P end and the T end is connected to the T1 end.

[0047] (712) When it is necessary to control the motor to reverse, the P end of the first control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the motor through the B end of the first control valve and flows back to the oil tank from the first port through the A end of the first control valve; the P1 end of the first control valve is connected to the T end and the P end is connected to the T1 end.

[0048] (72) When it is necessary to control the rotation of the second motor.

[0049] (721) When it is necessary to control the second motor to rotate forward, the P end of the second control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end. The hydraulic oil flows into the first port of the second motor through the A end of the second control valve and flows back to the oil tank from the second port through the B end of the second control valve; the P1 end of the second control valve is connected to the P end and the T end is connected to the T1 end.

[0050] (722) When it is necessary to control the second motor to reverse, the P end of the second control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the second motor through the B end of the second control valve and flows back to the oil tank from the first port through the A end of the second control valve; the P1 end of the second control valve is connected to the T end and the P end is connected to the T1 end.

[0051] (8) Part of the hydraulic oil in the first oil inlet pipeline flows to the motor through the first control valve, and part of the hydraulic oil flows to the second control end of the first center unloading valve through the P1 end or T1 end of the first control valve to drive the first center unloading valve to disconnect. The hydraulic oil cannot flow back to the oil tank through the first center unloading valve.

[0052] Part of the hydraulic oil in the second oil inlet pipeline flows to the second motor through the second control valve, and part of the hydraulic oil flows to the second control end of the second mid-position unloading valve through the P1 end or T1 end of the second control valve to drive the second mid-position unloading valve to disconnect, and the hydraulic oil cannot flow back to the oil tank through the second mid-position unloading valve.

[0053] (9) The hydraulic oil enters the motor and the second motor through the first control valve and the second control valve and drives the motor and the second motor to operate.

[0054] The above arrangement makes it easy to connect the motor and the second motor with the hydraulic pump station by reversing the first control valve and the second control valve, thereby realizing hydraulic control of the motor and the second motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a hydraulic schematic diagram of the control system of the present invention.

[0056] Figure 2 It is a connection diagram of the first oil circuit and the hydraulic pump station of the present invention.

[0057] Figure 3 It is a schematic diagram of the first oil circuit of the present invention.

[0058] 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.

[0059] Figure 5 It is a schematic diagram of the second oil circuit of the present invention.

[0060] Figure 6 It is the work flow chart of the present invention. DETAILED DESCRIPTION

[0061] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] like Figures 1 to 5 As shown, a method for extracting oil from 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] like Figure 1 , Figure 4 and Figure 5As 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.

[0068] like Figure 2 As shown, a first manual reversing valve 31 is provided between the first oil inlet pipeline 12 and the motor 3 , the oil inlet end of the first manual reversing valve 31 is connected to the hydraulic pump station 1 through the first oil inlet pipeline 12 , and the oil outlet end of the first manual reversing valve 31 is connected to the motor 3 .

[0069] like Figure 1 As shown, a second manual reversing valve 41 is provided between the second oil inlet pipeline 101 and the second motor 4 , the oil inlet end of the second manual reversing valve 41 is connected to the hydraulic pump station 1 through the second oil inlet pipeline 101 , and the oil outlet end of the second manual reversing valve 41 is connected to the second motor 4 .

[0070] like Figure 1 and Figure 2 As shown, a third pressure reducing valve 32 is also provided on the first oil inlet pipeline 12, and the oil inlet end of the third pressure reducing valve 32 is connected to the first oil inlet pipeline 12, and the oil outlet end of the third pressure reducing valve 32 is connected to the oil inlet end of the first manual reversing valve 31. By providing the third pressure reducing valve 32, the pressure of the hydraulic oil delivered to the motor 3 through the first manual reversing valve 31 can be set, which is convenient for controlling the speed increase of the winch. In this embodiment, a fourth pressure reducing valve 42 is provided between the second oil inlet pipeline 101 and the second manual reversing valve 41, and the working principle of the fourth pressure reducing valve 42 is the same as that of the third pressure reducing valve.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] like Figure 6 As shown, a method for extracting oil from a double winch comprises the following specific steps: (1) The hydraulic pump station supplies oil to the winch control system, which drives the motor and the second motor to operate.

[0085] (2) When the winch is on standby.

[0086] (3) The oil passage between the first control valve and the motor and the oil passage between the second control valve and the motor are disconnected.

[0087] (4) The hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid-position unloading valve; the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve.

[0088] (5) The first center unloading valve is connected, and the hydraulic oil in the first oil inlet pipeline is unloaded through the first center unloading valve and flows back to the hydraulic pump station; the second center unloading valve is connected, and the hydraulic oil in the second oil inlet pipeline is unloaded through the second center unloading valve and flows back to the hydraulic pump station.

[0089] (6) When the winch is turned on.

[0090] (7) The first control valve and the second control valve are switched.

[0091] (71) When it is necessary to control the motor rotation.

[0092] (711) When it is necessary to control the motor to rotate forward, the P end of the first control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end. The hydraulic oil flows into the first port of the motor through the A end of the first control valve and flows back to the oil tank from the second port through the B end of the first control valve; the P1 end of the first control valve is connected to the P end and the T end is connected to the T1 end.

[0093] (712) When it is necessary to control the motor to reverse, the P end of the first control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the motor through the B end of the first control valve and flows back to the oil tank from the first port through the A end of the first control valve; the P1 end of the first control valve is connected to the T end and the P end is connected to the T1 end.

[0094] (72) When it is necessary to control the rotation of the second motor.

[0095] (721) When it is necessary to control the second motor to rotate forward, the P end of the second control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end. The hydraulic oil flows into the first port of the second motor through the A end of the second control valve and flows back to the oil tank from the second port through the B end of the second control valve; the P1 end of the second control valve is connected to the P end and the T end is connected to the T1 end.

[0096] (722) When it is necessary to control the second motor to reverse, the P end of the second control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the second motor through the B end of the second control valve and flows back to the oil tank from the first port through the A end of the second control valve; the P1 end of the second control valve is connected to the T end and the P end is connected to the T1 end.

[0097] (8) Part of the hydraulic oil in the first oil inlet pipeline flows to the motor through the first control valve, and part of the hydraulic oil flows to the second control end of the first center unloading valve through the P1 end or T1 end of the first control valve to drive the first center unloading valve to disconnect. The hydraulic oil cannot flow back to the oil tank through the first center unloading valve.

[0098] Part of the hydraulic oil in the second oil inlet pipeline flows to the second motor through the second control valve, and part of the hydraulic oil flows to the second control end of the second mid-position unloading valve through the P1 end or T1 end of the second control valve to drive the second mid-position unloading valve to disconnect, and the hydraulic oil cannot flow back to the oil tank through the second mid-position unloading valve.

[0099] (9) The hydraulic oil enters the motor and the second motor through the first control valve and the second control valve and drives the motor and the second motor to operate.

[0100] (10) When one of the motors is required to work and the other motor is on standby; (11) The hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, and the first port of the first unloading shuttle valve is connected to the third port or the second port of the first unloading shuttle valve is connected to the third port.

[0101] (12) The hydraulic oil flows through the third port of the first unloading shuttle valve to the second control end of the first center unloading valve and the second control end of the second center unloading valve.

[0102] (13) The first center unloading valve and the second center unloading valve are closed, and the hydraulic oil flows normally to the motor that needs to work and drives the motor to operate.

[0103] (14) When the motor needs to be accelerated, the first manual reversing valve is driven to reverse, connecting the first oil inlet pipe and the motor, and the hydraulic oil flows into the motor through the first manual reversing valve to increase pressure and speed.

[0104] (15) When the speed of the second motor needs to be increased, the second manual reversing valve is driven to reverse, connecting the second oil inlet pipe and the motor, and the hydraulic oil flows into the motor through the second manual reversing valve to increase the pressure and speed.

[0105] 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.

[0106] 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.

[0107] 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 method for extracting oil from a double winch, implemented by an unloading system, wherein the unloading system comprises 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 specific steps include: (1) The hydraulic pump station supplies oil to the winch control system, which drives the motor and the second motor to operate; (10) When one of the motors is required to work and the other motor is on standby; (11) The hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, and the first port of the first unloading shuttle valve is connected to the third port or the second port of the first unloading shuttle valve is connected to the third port; (12) The hydraulic oil flows through the third port of the first unloading shuttle valve to the second control end of the first center unloading valve and the second control end of the second center unloading valve; (13) The first center unloading valve and the second center unloading valve are closed, and the hydraulic oil flows normally to the motor that needs to work and drives the motor to operate; (14) When the motor needs to be accelerated, the first manual reversing valve is driven to reverse, the first oil inlet pipe and the motor are connected, and the hydraulic oil flows into the motor through the first manual reversing valve to increase the pressure and speed; (15) When the second motor needs to be accelerated, the second manual reversing valve is driven to reverse, connecting the second oil inlet pipe and the motor, and the hydraulic oil flows into the motor through the second manual reversing valve to increase pressure and speed; 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; The hydraulic pump station comprises an oil tank and a metering pump, wherein the oil inlet end of the metering pump is connected to the oil tank, the oil outlet end of the metering pump is 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; A first manual reversing valve is provided between the first oil inlet pipeline and the motor, the oil inlet end of the first manual reversing valve is connected to the hydraulic pump station through the first oil inlet pipeline, and the oil outlet end of the first manual reversing valve is connected to the motor; A second manual reversing valve is provided between the second oil inlet pipeline and the second motor, the oil inlet end of the second manual reversing valve is connected to the hydraulic pump station through the second oil inlet pipeline, and the oil outlet end of the second manual reversing valve is connected to the second motor.

2. The oil extraction method 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. The oil extraction method 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. The oil extraction method 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 oil extraction method for 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. The oil extraction method 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 oil extraction method for a double winch according to claim 1, characterized in that: The metering pump includes 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 oil extraction method for 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.

9. The oil extraction method for a double winch according to claim 1, characterized in that: A third pressure reducing valve is also provided on the first oil inlet pipeline, the oil inlet end of the third pressure reducing valve is connected to the first oil inlet pipeline, and the oil outlet end of the third pressure reducing valve is connected to the oil inlet end of the first manual reversing valve.

10. The oil extraction method for a double winch according to claim 1, characterized in that: After step (1), the following steps are specifically included: (2) When the winch is on standby; (3) The oil circuit between the first control valve and the motor and the oil circuit between the second control valve and the motor are disconnected; (4) The hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid-position unloading valve; the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve; (5) The first center unloading valve is connected, and the hydraulic oil in the first oil inlet pipeline is unloaded through the first center unloading valve and flows back to the hydraulic pump station; the second center unloading valve is connected, and the hydraulic oil in the second oil inlet pipeline flows back to the hydraulic pump station through the second center unloading valve; (6) When the winch is turned on; (7) Switching direction of the first control valve and the second control valve; (71) When it is necessary to control the motor rotation; (711) When it is necessary to control the motor to rotate forward, the P end of the first control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end, and the hydraulic oil flows into the first port of the motor through the A end of the first control valve and flows back to the oil tank from the second port through the B end of the first control valve; the P1 end of the first control valve is connected to the P end and the T end is connected to the T1 end; (712) When it is necessary to control the motor to reverse, the P end of the first control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the motor through the B end of the first control valve and flows back to the oil tank from the first port through the A end of the first control valve; the P1 end of the first control valve is connected to the T end and the P end is connected to the T1 end; (72) When it is necessary to control the rotation of the second motor; (721) When it is necessary to control the second motor to rotate forward, the P end of the second control valve is controlled to be connected to the A end and the B end is controlled to be connected to the T end, and the hydraulic oil flows into the first port of the second motor through the A end of the second control valve and flows back to the oil tank from the second port through the B end of the second control valve; the P1 end of the second control valve is connected to the P end and the T end is connected to the T1 end; (722) When it is necessary to control the second motor to reverse, the P end of the second control valve is controlled to be connected to the B end and the A end is controlled to be connected to the T end, and the hydraulic oil flows into the second port of the second motor through the B end of the second control valve and flows back to the oil tank from the first port through the A end of the second control valve; the P1 end of the second control valve is connected to the T end and the P end is connected to the T1 end; (8) A portion of the hydraulic oil in the first oil inlet pipeline flows to the motor through the first control valve, and a portion of the hydraulic oil flows to the second control end of the first center unloading valve through the P1 end or T1 end of the first control valve to drive the first center unloading valve to disconnect, and the hydraulic oil cannot flow back to the oil tank through the first center unloading valve; Part of the hydraulic oil in the second oil inlet pipeline flows to the second motor through the second control valve, and part of the hydraulic oil flows to the second control end of the second middle unloading valve through the P1 end or the T1 end of the second control valve to drive the second middle unloading valve to disconnect, so that the hydraulic oil cannot flow back to the oil tank through the second middle unloading valve; (9) The hydraulic oil enters the motor and the second motor through the first control valve and the second control valve and drives the motor and the second motor to operate.

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