Oil extraction method for a double winch

Abstract

The application provides a method for taking oil from a double winch, and the specific steps comprise: (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 of the motors needs to work and the other motor needs to be on standby; (11) hydraulic oil flows to a first unloading spool valve through a first operating valve or a second operating valve, and a first port of the first unloading spool valve is communicated with a third port or a second port of the first unloading spool valve is communicated with the third port; (12) the hydraulic oil flows to a second control end of a first mid unloading valve and a second control end of a second mid unloading valve through the third port of the first unloading spool valve; (13) the first mid unloading valve and the second mid unloading valve are closed, and the hydraulic oil normally flows to the motor that needs to work and drives the motor to operate; when only one winch needs to be started, the unloading oil path of the standby winch is closed in the above method, so that the hydraulic oil can output sufficient oil pressure to drive the working winch to move.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of winch control, in particular to an oil taking method of double winch. BACKGROUND

[0002] Currently, multiple winches are usually configured to work cooperatively or independently on a marine platform. The winches mainly include platform lifting winch, traction winch, tension winch and auxiliary winch, etc. These winches are usually driven by hydraulic systems.

[0003] Some winches have high working load and some winches have relatively low working load among multiple winches on a marine platform. Therefore, in order to meet the working load requirements of each winch, the commonly used method is to set a set of hydraulic system for each winch, and each set of hydraulic system drives the corresponding winch to work independently to meet the different load requirements of the winch. However, this will increase the cost.

[0004] A multiple winch hydraulic system is disclosed in a patent document with the Chinese patent application number 201811015785.4 and the publication date of January 1, 2019, which belongs to the technical field of hydraulic control. The hydraulic system includes a main pump group, three proportional valves, two electromagnetic valves and three hydraulic motors. The three proportional valves are all three-position six-way valves, and the three proportional valves are one-to-one corresponding to 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 to the corresponding hydraulic motor. The hydraulic motor is used to drive the winch. The two electromagnetic valves can control the series and parallel connection of the three proportional valves. By changing the series and parallel connection relationship between the three proportional valves, the size and sequence of the hydraulic oil provided by the main pump group to the three hydraulic motors can be changed, so as to drive multiple winches according to the priority of multiple winches. Therefore, only one set of hydraulic system is needed to drive multiple winches, which saves the manufacturing cost of the marine platform, and the structure is simple and easy to operate.

[0005] The current multiple winch hydraulic system usually uses one hydraulic pump station to drive multiple winches. In order to ensure that each winch can run at full load, a fixed displacement pump is needed. However, when the motor is not working, the fixed displacement pump will still input hydraulic oil to the control system. If the fixed displacement pump is applied to the hydraulic system of the above-mentioned document, it does not unload the high-pressure hydraulic oil, which can easily cause a large energy loss in the hydraulic oil circuit. SUMMARY

[0006] The application provides a method for taking oil of double winches, which realizes low-pressure circulation of hydraulic oil output by a quantitative pump when the winch is on standby, guarantees the stability of the oil circuit and prevents energy loss, closes the unloading oil circuit of the standby winch when only one winch needs to be started, thereby guaranteeing that the hydraulic oil can output sufficient oil pressure to drive the winch to move, preventing the winch from being unable to operate at full capacity, and enabling the winch to be pressurized when the winch needs to be accelerated.

[0007] To achieve the above-mentioned purpose, the technical scheme of the application is as follows: a method for taking oil of double winches is realized through an unloading system, the unloading system 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, and the specific steps comprise:

[0008] (1) The hydraulic pump station supplies oil to the winch control system, and the winch control system drives the motor and the second motor to operate.

[0009] (10) When one of the motors needs to work and the other motor needs to be on standby.

[0010] (11) The hydraulic oil flows to a first unloading spool valve through a first operating valve or a second operating valve, and a first port of the first unloading spool valve is in communication with a third port or a second port is in communication with the third port.

[0011] (12) The hydraulic oil flows to a second control end of a first mid unloading valve and a second control end of a second mid unloading valve through the third port of the first unloading spool valve.

[0012] (13) The first mid unloading valve and the second mid unloading valve are closed, and the hydraulic oil normally flows to the motor that needs to work and drives the motor to operate.

[0013] (14) When the motor needs to be accelerated, a first manual reversing valve is driven to reverse, the first oil inlet pipeline and the motor are connected, the hydraulic oil flows into the motor through the first manual reversing valve to pressurize and accelerate.

[0014] (15) When the second motor needs to be accelerated, a second manual reversing valve is driven to reverse, the second oil inlet pipeline and the motor are connected, and the hydraulic oil flows into the motor through the second manual reversing valve to pressurize and accelerate.

[0015] 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.

[0016] The first oil circuit comprises a first neutral unloading valve and a first control valve, an oil outlet of the hydraulic pump station is connected to a P end of the first control valve through a first oil outlet pipeline, a T end of the first control valve is connected to an oil return port of the hydraulic pump station through a first oil return pipeline, an A end of the first control valve is connected to a first port of the motor, and a B end of the first control valve is connected to a second port of the motor; a first neutral unloading valve is arranged between the first oil inlet pipeline and the first oil return pipeline, an oil inlet end of the first neutral unloading valve is connected to the first oil inlet pipeline, an oil outlet end of the first neutral unloading valve is connected to the first oil return pipeline, and a first control end of the first neutral unloading valve is connected to the first oil inlet pipeline; a P1 end and a T1 end of the first control valve are connected to a second control end of the first neutral unloading valve, and when the first control valve is reversed, the P1 end is communicated with the P end and the T end is communicated with the T1 end or the P1 end is communicated with the T end and the P end is communicated with the T1 end.

[0017] The second oil circuit comprises a second neutral unloading valve and a second control valve, an oil outlet of the hydraulic pump station is connected to a P end of the second control valve through a second oil outlet pipeline, a T end of the second control valve is connected to an oil return port of the hydraulic pump station through a second oil return pipeline, an A end of the second control valve is connected to a first port of the second motor, and a B end of the second control valve is connected to a second port of the second motor; a second neutral unloading valve is arranged between a second oil inlet pipeline and a second oil return pipeline, an oil inlet end of the second neutral unloading valve is connected to the second oil inlet pipeline, an oil outlet end of the second neutral unloading valve is connected to the second oil return pipeline, and a first control end of the second neutral unloading valve is connected to the second oil inlet pipeline; a P1 end and a T1 end of the second control valve are connected to a second control end of the second neutral unloading valve, and when the second control valve is reversed, the P1 end is communicated with the P end and the T end is communicated with the T1 end or the P1 end is communicated with the T end and the P end is communicated with the T1 end.

[0018] A first unloading shuttle valve is arranged between the first oil circuit and the second oil circuit, a first port of the first unloading shuttle valve is connected to a P1 end and a T1 end of the first control valve, a second port of the first unloading shuttle valve is connected to a P1 end and a T1 end of the second control valve, and a third port of the first unloading shuttle valve is connected to a second control end of the first neutral unloading valve and a second control end of the second neutral unloading valve.

[0019] The hydraulic pump station comprises an oil tank and a constant displacement pump, an oil inlet end of the constant displacement pump is connected to the oil tank, an oil outlet end of the constant displacement pump is connected to the first oil inlet pipeline and the second oil inlet pipeline through an oil outlet, and the first oil return pipeline and the second oil return pipeline are connected to the oil tank through an oil return port.

[0020] A first manual reversing valve is arranged between the first oil inlet pipeline and the motor, an oil inlet end of the first manual reversing valve is connected to the hydraulic pump station through the first oil inlet pipeline, and an oil outlet end of the first manual reversing valve is connected to the motor.

[0021] The second manual reversing valve is arranged between the second oil inlet pipeline and the second motor, and the oil inlet end of the second manual reversing valve is connected with the hydraulic pump station through the second oil inlet pipeline, and the oil outlet end of the second manual reversing valve is connected with the second motor.

[0022] The above structure, through the hydraulic pump station to the motor and the second motor oil, when the winch start, to drive the motor rotation through the control of the first operating valve reversing, so that the first operating valve P end communication A end and B end communication T end control motor positive rotation or the first operating valve P end communication B end and A end communication T end control motor reverse rotation, thus realizing the control of the motor, and because the first mid 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 operating valve is not reversed, at this time the hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid unloading valve, so that the first mid unloading valve is connected, and the hydraulic oil can be unloaded through the first mid unloading valve and flow back to the hydraulic pump station; When the first operating valve is reversed, P1 end and P end communication and T end and T1 end communication or P1 end and T end communication and P end and T1 end communication, thus making the hydraulic oil flowing from the hydraulic pump station to the P end of the first operating valve can flow to the second control end of the first mid unloading valve through P1 end and T1 end, at this time, the hydraulic oil drives the first mid unloading valve to be disconnected, so that the hydraulic oil cannot be unloaded through the first mid unloading valve, and the hydraulic oil can be normally supplied and drive the motor to rotate, thereby, through the setting of the first mid unloading valve, when the winch is standby, the first mid unloading valve is opened to make the hydraulic oil flow back to the hydraulic pump station through the first mid unloading valve to realize low pressure circulation, thereby ensuring that the winch energy consumption will not be too large, and when the motor needs to work, the first mid unloading valve is disconnected through the hydraulic oil flowing to the first operating valve, thereby making the hydraulic oil can normally flow to the motor to act.

[0023] To drive the second motor to rotate, the second control valve is reversed to control the P end of the second control valve to communicate with the A end and the B end to communicate with the T end to control the second motor to rotate forward or the P end of the first control valve to communicate with the B end and the A end to communicate with the T end to control the second motor to rotate reversely, thereby realizing the control of the second motor. Since the second neutral 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 reversed, at this time, the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second neutral unloading valve, thereby making the second neutral unloading valve communicate, and the hydraulic oil can flow back to the hydraulic pump station through the second neutral unloading valve.

[0024] Meanwhile, the first unloading shuttle valve is arranged between the first oil path and the second oil path, so that when one of the motors works and the other motor is on standby, the hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, so that the first port of the first unloading shuttle valve communicates with the third port or the second port communicates with the third port, thereby the hydraulic oil can flow to the second control end of the first neutral unloading valve and the second control end of the second neutral unloading valve through the third port of the first unloading shuttle valve, thereby closing the neutral unloading valve, preventing the hydraulic oil from being unloaded by the neutral unloading valve when the winch works, resulting in insufficient oil pressure.

[0025] Further, the second spring is arranged on the second control end of the second neutral unloading valve, and the second spring pushes the internal oil path of the second neutral unloading valve to make the oil inlet end and the oil outlet end of the second neutral unloading valve disconnect.

[0026] Further, the second spring is arranged on the second control end of the second neutral unloading valve, and the second spring pushes the internal oil path of the second neutral unloading valve to make the oil inlet end and the oil outlet end of the second neutral unloading valve disconnect.

[0027] The above setting, by spring plus the second control end of hydraulic oil pressure to overcome the pressure of the hydraulic oil into the first control end of the neutral load valve, so as to ensure the oil inlet and outlet of the neutral load valve is disconnected, prevent the hydraulic oil from the neutral load valve back to the tank when the oil circuit is working normally. Further, the first shuttle valve is arranged between the P1 end and the T1 end of the first operating valve and the second control end of the first neutral load valve, the first port of the first shuttle valve is connected with the P1 end of the first operating valve, the second port of the first shuttle valve is connected with the T1 end of the first operating valve, and the third port of the first shuttle valve is connected with the second control end of the first neutral load valve.

[0028] The second shuttle valve is arranged between the P1 end and the T1 end of the second operating valve and the second control end of the second neutral load valve, the first port of the second shuttle valve is connected with the P1 end of the second operating valve, the second port of the second shuttle valve is connected with the T1 end of the second operating valve, and the third port of the second shuttle valve is connected with the second control end of the second neutral load valve.

[0029] The above setting, by setting the first shuttle valve and the second shuttle valve, so as to prevent the hydraulic oil flowing into the second control end of the neutral load valve from the P1 end and the T1 end of the first operating valve and the second operating valve from conflicting with each other.

[0030] Further, the third shuttle valve is arranged between the second control end of the first neutral load valve and the third port of the first unloading shuttle valve, the first port of the third shuttle valve is connected with the third port of the first shuttle valve, the second port of the third shuttle valve is connected with the third port of the first unloading shuttle valve, and the third port of the third shuttle valve is connected with the second control end of the first neutral load valve.

[0031] The fourth shuttle valve is arranged between the second control end of the second neutral load valve and the third port of the first unloading shuttle valve, the first port of the fourth shuttle valve is connected with the third port of the second shuttle valve, the second port of the fourth shuttle valve is connected with the third port of the first unloading shuttle valve, and the third port of the fourth shuttle valve is connected with the second control end of the second neutral load valve.

[0032] The above setting, by setting the third shuttle valve and the fourth shuttle valve, so as to prevent the hydraulic oil flowing into the second control end of the neutral load valve from conflicting with other oil circuits.

[0033] Further, the first overflow valve is arranged between the second control end of the first neutral load valve and the first oil return pipeline, the oil inlet end of the first overflow valve is connected with the second control end of the first neutral load valve, and the oil outlet end of the first overflow valve is connected with the first oil return pipeline.

[0034] The above setting, by setting the first overflow valve, when the winch standby, the first overflow valve power off always open, so that the hydraulic oil through the first overflow valve unloading and pressure reduction to achieve the low pressure cycle of hydraulic oil, thereby play a role in energy saving, when the winch work, the first overflow valve power off, so that the hydraulic oil into the motor to work.

[0035] Further, the first oil inlet pipeline is provided with a first pressure reducing valve, the oil inlet end of the first pressure reducing valve is connected with 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 with the P end of the first control valve through the first oil inlet pipeline.

[0036] The above setting, by setting the first pressure reducing valve, the oil pressure of the oil circuit can be set, which is convenient for controlling the winch.

[0037] Further, the constant flow pump comprises 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 with the oil tank, the oil outlet ends of the first oil pump and the second oil pump are connected with 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 with the oil tank through the oil return port.

[0038] The above setting, by setting two oil pumps, so that the winch can realize full load operation, and if one of the oil pumps fails to work, the other oil pump can also drive the winch to operate at half load, preventing accidents caused by sudden stop of the winch.

[0039] A second unloading shuttle valve is arranged between the first control valve and the first unloading shuttle valve, a first port of the second unloading shuttle valve is connected with a P1 end of the first control valve, a second port of the second unloading shuttle valve is connected with a T1 end of the first control valve, and a third port of the second unloading shuttle valve is connected with a first port of the first unloading valve.

[0040] A third unloading shuttle valve is arranged between the second control valve and the first unloading shuttle valve, a first port of the third unloading shuttle valve is connected with a P1 end of the second control valve, a second port of the third unloading shuttle valve is connected with a T1 end of the second control valve, and a third port of the third unloading shuttle valve is connected with a second port of the first unloading valve.

[0041] The above setting, by setting the second unloading shuttle valve and the third unloading shuttle valve, the problem that the hydraulic oil flowing into the first unloading shuttle valve from the P1 end and the T1 end of the first control valve and the second control valve conflicts with each other is prevented.

[0042] Further, a third pressure reducing valve is arranged on the first oil inlet pipeline, the oil inlet end of the third pressure reducing valve is connected with the first oil inlet pipeline, and the oil outlet end of the third pressure reducing valve is connected with the oil inlet end of the first manual reversing valve.

[0043] The above setting, by setting the third pressure reducing valve, so that the hydraulic oil pressure delivered to the motor through the first hand reversing valve can be set, facilitate the control of the speed of the winch.

[0044] Further, step (1) after the specific still includes:

[0045] (2) when the winch standby.

[0046] (3) the first control valve and the motor between the oil and the second control valve and the motor between the oil is disconnected.

[0047] (4) in the first oil pipeline hydraulic oil into the first mid unloading valve control end; in the second oil pipeline hydraulic oil into the second mid unloading valve control end;

[0048] (5) the first mid unloading valve communication, in the first oil pipeline hydraulic oil through the first mid unloading valve unloading flow back to the hydraulic pump station; the second mid unloading valve communication, in the second oil pipeline hydraulic oil through the second mid unloading valve flow back to the hydraulic pump station.

[0049] (6) when the winch start.

[0050] (7) the first control valve and the second control valve reversing.

[0051] (71) when the need to control the motor rotation.

[0052] (711) when the need to control the motor forward rotation, control the first control valve P end communication A end and B end communication T end, hydraulic oil through the first control valve A end into the motor first port and from the second port through the first control valve B end flow back to the tank; the first control valve P1 end and P end communication and T end and T1 end communication.

[0053] (712) when the need to control the motor reverse rotation, control the first control valve P end communication B end and A end communication T end, hydraulic oil through the first control valve B end into the motor second port and from the first port through the first control valve A end flow back to the tank; the first control valve P1 end and T end communication and P end and T1 end communication.

[0054] (72) when the need to control the second motor rotation.

[0055] (721) when the need to control the second motor forward rotation, control the second control valve P end communication A end and B end communication T end, hydraulic oil through the second control valve A end into the second motor first port and from the second port through the second control valve B end flow back to the tank; the second control valve P1 end and P end communication and T end and T1 end communication.

[0056] (722) When the second motor needs to be controlled to reverse, the P port of the second control valve is communicated with the B port and the A port is communicated with the T port, the hydraulic oil flows into the second port of the second motor through the B port of the second control valve and flows back to the oil tank through the A port of the second control valve; the P1 port and the T port of the second control valve are communicated and the P port and the T1 port are communicated.

[0057] (8) A part of the hydraulic oil in the first oil inlet pipeline flows to the motor through the first control valve, and a part of the hydraulic oil flows to the second control end of the first mid-position unloading valve through the P1 port or the T1 port of the first control valve to drive the first mid-position unloading valve to be disconnected, and the hydraulic oil cannot flow back to the oil tank through the first mid-position unloading valve.

[0058] A part of the hydraulic oil in the second oil inlet pipeline flows to the second motor through the second control valve, and a part of the hydraulic oil flows to the second control end of the second mid-position unloading valve through the P1 port or the T1 port of the second control valve to drive the second mid-position unloading valve to be disconnected, and the hydraulic oil cannot flow back to the oil tank through the second mid-position unloading valve.

[0059] (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 move.

[0060] The first control valve and the second control valve are reversed to facilitate the communication of the motor and the second motor with the hydraulic pump station, and the hydraulic control of the motor and the second motor is realized. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 It is a hydraulic schematic diagram of the control system of the application.

[0062] Figure 2 It is a connection schematic diagram of the first oil circuit and the hydraulic pump station of the application.

[0063] Figure 3 It is a schematic diagram of the first oil circuit of the application.

[0064] Figure 4 It is a connection schematic diagram of the first oil circuit and the first unloading shuttle valve of the application.

[0065] Figure 5 It is a schematic diagram of the second oil circuit of the application.

[0066] Figure 6 It is a work flow chart of the application. DETAILED DESCRIPTION

[0067] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0068] As Figures 1 to 5As shown, a method for extracting oil using a double winch includes a hydraulic pump station 1 and a winch control system. The hydraulic pump station 1 supplies oil to the winch control system, which drives a motor 3 and a second motor 4 to rotate. The winch control system includes a first oil circuit 201 and a second oil circuit 202. The first oil circuit 201 drives the motor 3 to rotate, and the second oil circuit 202 drives the second motor 4 to rotate.

[0069] The first oil circuit 201 includes a first neutral unloading valve 21 and a first control valve 22. The oil outlet 11 of the hydraulic pump station 1 is connected to the P end of the first control valve 22 through the first oil outlet pipe 12. The T end of the first control valve 22 is connected to the return oil outlet 14 of the hydraulic pump station 1 through the first return oil pipe 13. The A end of the first control valve 22 is connected to the first port A1 of the motor 3, and the B end of the first control valve 22 is connected to the second port B1 of the motor 3.

[0070] like Figure 2 As shown, a first neutral unloading valve 21 is provided between the first oil inlet pipe 12 and the first oil return pipe 13. The oil inlet end of the first neutral unloading valve 21 is connected to the first oil inlet pipe 12, and the oil outlet end of the first neutral unloading valve 21 is connected to the first oil return pipe 13. The first control end 211 of the first neutral unloading valve 21 is connected to the first oil inlet pipe 12. The P1 end and T1 end of the first control valve 22 are connected to the second control end 212 of the first neutral unloading valve 21. When the first control valve 22 reverses, the P1 end and the P end are connected, and the T end and the T1 end are connected, or the P1 end and the T end are connected, and the P end and the T1 end are connected.

[0071] like Figure 1 and Figure 5 As shown, the second oil circuit 202 includes a second neutral 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 pipe 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 pipe 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.

[0072] A second neutral position unloading valve 51 is provided between the second oil inlet pipe 101 and the second oil return pipe 102. The oil inlet end of the second neutral position unloading valve 51 is connected to the second oil inlet pipe 101, and the oil outlet end of the second neutral position unloading valve 51 is connected to the second oil return pipe 102. The first control end 511 of the second neutral position unloading valve 51 is connected to the second oil inlet pipe 101. The P1 end and T1 end of the second control valve 52 are connected to the second control end 512 of the second neutral position unloading valve 51. When the second control valve 52 is reversed, the P1 end and the P end are connected, and the T end and the T1 end are connected, or the P1 end and the T end are connected, and the P end and the T1 end are connected.

[0073] As shown in Figure 1 , Figure 4 and Figure 5 , a first unloading shuttle valve 6 is arranged between the first oil path 201 and the second oil path 202, a first port 61 of the first unloading shuttle valve 6 is connected to the P1 port and the T1 port of the first control valve 22, a second port 62 of the first unloading shuttle valve 6 is connected to the P1 port and the T1 port of the second control valve 52, and a third port 63 of the first unloading shuttle valve 6 is connected to the second control end 211 of the first neutral unloading valve 21 and the second control end 511 of the second neutral unloading valve 51.

[0074] As shown in Figure 2 , a first manual reversing valve 31 is arranged between the first oil inlet pipeline 12 and the motor 3, an 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 an oil outlet end of the first manual reversing valve 31 is connected to the motor 3.

[0075] As shown in Figure 1 , a second manual reversing valve 41 is arranged between the second oil inlet pipeline 101 and the second motor 4, an 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 an oil outlet end of the second manual reversing valve 41 is connected to the second motor 4.

[0076] As shown in Figure 1 and Figure 2 , a third pressure reducing valve 32 is further arranged on the first oil inlet pipeline 12, an oil inlet end of the third pressure reducing valve 32 is connected to the first oil inlet pipeline 12, and an 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 arranging the third pressure reducing valve 32, the hydraulic oil pressure delivered to the motor 3 through the first manual reversing valve 31 can be set, which facilitates the control of the speed increase of the winch. In the embodiment, a fourth pressure reducing valve 42 is arranged 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.

[0077] A spring 213 is further arranged on the second control end 212 of the first neutral unloading valve 21, the spring 213 pushes the internal oil path of the first neutral unloading valve 21 to disconnect the oil inlet end and the oil outlet end of the first neutral unloading valve 21.

[0078] A second spring 513 is further arranged on the second control end 512 of the second neutral unloading valve 51, the second spring 513 pushes the internal oil path of the second neutral unloading valve 51 to disconnect the oil inlet end and the oil outlet end of the second neutral unloading valve 51.

[0079] The hydraulic oil pressure of the second control end 212 is added to the spring 213 to overcome the pressure of the hydraulic oil flowing into the first control end 211 of the first neutral load valve 21, thereby ensuring that the oil inlet end and the oil outlet end of the first neutral load valve 21 are disconnected, and preventing the hydraulic oil from flowing back to the oil tank from the first neutral load valve 21 when the oil circuit is normally working.

[0080] As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21. Figure 3 Figure 4 By arranging the first shuttle valve 23, the hydraulic oil flowing into the second control end 212 of the first neutral load valve 21 from the P1 end and the T1 end of the first control valve 22 is prevented from conflicting with each other.

[0081] As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21.

[0082] As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21. Figure 5 As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21.

[0083] Figure 4 As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21.

[0084] As shown in FIG. 1, a first shuttle valve 23 is arranged between the P1 end and the T1 end of the first control valve 22 and the second control end 212 of the first neutral load valve 21, a first port 231 of the first shuttle valve 23 is connected to the P1 end of the first control valve 22, a second port 232 of the first shuttle valve 23 is connected to the T1 end of the first control valve 22, and a third port 233 of the first shuttle valve 23 is connected to the second control end 212 of the first neutral load valve 21.

[0085] ​​The above arrangement prevents the problem of mutual conflict of hydraulic oil between the second control terminal of the middle unloading valve and other oil paths by arranging the third shuttle valve 26 and the fourth shuttle valve 66.

[0086] A first overflow valve 24 is arranged between the second control terminal 212 of the first middle unloading valve 21 and the first oil return pipeline 13, with the oil inlet end of the first overflow valve 24 being connected to the second control terminal 212 of the first middle unloading valve 21 and the oil outlet end of the first overflow valve 24 being connected to the first oil return pipeline 13. By arranging the first overflow valve 24, when the winch is in standby, the first overflow valve 24 is always open without power supply, so that the hydraulic oil is unloaded and depressurized through the first overflow valve 24 to realize low-pressure circulation of the hydraulic oil, thereby achieving energy saving effect; when the winch is working, the first overflow valve 24 is closed with power supply, so that the hydraulic oil is pressurized to enter the motor to work. In the embodiment, a second overflow valve 64 is arranged between the second control terminal 512 of the second middle unloading valve 51 and the second oil return pipeline 102, and the second overflow valve 64 has the same structure and working principle as the first overflow valve 24.

[0087] A first pressure reducing valve 25 is further arranged on the first oil inlet pipeline 12, with the oil inlet end of the first pressure reducing valve 25 being 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 being connected to the P end of the first control valve 22 through the first oil inlet pipeline 12. By arranging the first pressure reducing valve 25, the oil pressure of the oil path can be set, which is convenient for controlling the winch. In the embodiment, a second pressure reducing valve 65 is further arranged on the second oil inlet pipeline 101, and the second pressure reducing valve 65 has the same structure and working principle as the first pressure reducing valve 25.

[0088] As shown in Figure 1 The hydraulic pump station 1 includes an oil tank 15, a first oil pump 16 and a second oil pump 17, with the oil inlet ends of the first oil pump 116 and the second oil pump 17 being connected to the oil tank 15, the oil outlet ends of the first oil pump 16 and the second oil pump 17 being connected to the first oil inlet pipeline 12 and the second oil inlet pipeline 101 through the oil outlet 11, and the first oil return pipeline 13 and the second oil return pipeline 102 being connected to the oil tank 15 through the oil return 14; the first oil pump 16 and the second oil pump 17 are constant displacement pumps. By arranging the constant displacement pumps, it is ensured that the winch can work in the maximum load state. By arranging two oil pumps, the winch can realize full-load operation, and if one of the oil pumps fails to work, the winch can still be driven to work in half-load by the other oil pump, preventing accidents caused by sudden stop of the winch.

[0089] As shown in Figure 4As shown, a second unloading shuttle valve 7 is arranged 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.

[0090] As shown, Figure 5 A third unloading shuttle valve 8 is arranged between the second control valve 52 and the first unloading shuttle valve 6, a first port 81 of the third unloading shuttle valve 8 is connected to the P1 end of the second control valve 52, a second port 82 of the third unloading shuttle valve 8 is connected to the T1 end of the second control valve 52, and a third port 83 of the third unloading shuttle valve 8 is connected to the second port 62 of the first unloading valve.

[0091] The above arrangement, by arranging the second unloading shuttle valve 7 and the third unloading shuttle valve 8, prevents the problem of the hydraulic oil 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 conflicting with each other.

[0092] As shown, Figure 6 A method for taking oil of a double winch, the specific steps comprising:

[0093] (1) The hydraulic pump station supplies oil to the winch control system, and the winch control system drives the motor and the second motor to operate.

[0094] (2) When the winch is on standby.

[0095] (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.

[0096] (4) The hydraulic oil in the first oil inlet pipeline flows into the first control end of the first mid-position unloading valve, and the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second mid-position unloading valve.

[0097] (5) The first mid-position unloading valve is connected, and the hydraulic oil in the first oil inlet pipeline flows back to the hydraulic pump station through the first mid-position unloading valve; the second mid-position unloading valve is connected, and the hydraulic oil in the second oil inlet pipeline flows back to the hydraulic pump station through the second mid-position unloading valve.

[0098] (6) When the winch is started.

[0099] (7) The first control valve and the second control valve are reversed.

[0100] (71) When it is needed to control the rotation of the motor.

[0101] (711) When the motor needs to be controlled to rotate forward, the P port of the first control valve is connected to the A port and the B port is connected to the T port, hydraulic oil flows into the first port of the motor through the A port of the first control valve and flows back to the tank through the B port of the first control valve; the P1 port of the first control valve is connected to the P port and the T port is connected to the T1 port.

[0102] (712) When the motor needs to be controlled to rotate reversely, the P port of the first control valve is connected to the B port and the A port is connected to the T port, hydraulic oil flows into the second port of the motor through the B port of the first control valve and flows back to the tank through the A port of the first control valve; the P1 port of the first control valve is connected to the T port and the P port is connected to the T1 port.

[0103] (72) When the second motor needs to be controlled to rotate.

[0104] (721) When the second motor needs to be controlled to rotate forward, the P port of the second control valve is connected to the A port and the B port is connected to the T port, hydraulic oil flows into the first port of the second motor through the A port of the second control valve and flows back to the tank through the B port of the second control valve; the P1 port of the second control valve is connected to the P port and the T port is connected to the T1 port.

[0105] (722) When the second motor needs to be controlled to rotate reversely, the P port of the second control valve is connected to the B port and the A port is connected to the T port, hydraulic oil flows into the second port of the second motor through the B port of the second control valve and flows back to the tank through the A port of the second control valve; the P1 port of the second control valve is connected to the T port and the P port is connected to the T1 port.

[0106] (8) Part of the hydraulic oil in the first oil inlet pipeline flows to the motor through the first control valve, part of the hydraulic oil flows to the second control end of the first neutral load valve through the P1 port or the T1 port of the first control valve to drive the first neutral load valve to be disconnected, and the hydraulic oil cannot flow back to the tank through the first neutral load valve.

[0107] Part of the hydraulic oil in the second oil inlet pipeline flows to the second motor through the second control valve, part of the hydraulic oil flows to the second control end of the second neutral load valve through the P1 port or the T1 port of the second control valve to drive the second neutral load valve to be disconnected, and the hydraulic oil cannot flow back to the tank through the second neutral load valve.

[0108] (9) 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 move.

[0109] (10) When one of the motors needs to work and the other motor needs to be on standby;

[0110] (11) Hydraulic oil flows to the first unloading spool valve through the first control valve or the second control valve, and the first port of the first unloading spool valve is communicated with the third port or the second port is communicated with the third port.

[0111] (12) Hydraulic oil flows to the second control end of the first neutral unloading valve and the second control end of the second neutral unloading valve through the third port of the first unloading spool valve.

[0112] (13) The first neutral unloading valve and the second neutral unloading valve are closed, and hydraulic oil normally flows to the motor to be worked and drives the motor to work.

[0113] (14) When the motor needs to be speeded up, the first manual reversing valve is driven to reverse, the first oil inlet pipeline and the motor are communicated, and hydraulic oil flows into the motor through the first manual reversing valve to increase the pressure and speed up.

[0114] (15) When the second motor needs to be speeded up, the second manual reversing valve is driven to reverse, the second oil inlet pipeline and the motor are communicated, and hydraulic oil flows into the motor through the second manual reversing valve to increase the pressure and speed up.

[0115] The working principle of the present application is as follows:

[0116] When the winch is started, the motor is driven to rotate by controlling the first control valve to reverse, so that the P end of the first control valve is communicated with the A end and the B end is communicated with the T end to control the motor to rotate forward or the P end of the first control valve is communicated with the B end and the A end is communicated with the T end to control the motor to rotate reversely, thereby realizing the control of the motor. Because 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 reversed, the hydraulic oil in the first oil inlet pipeline flows into the first control end of the first neutral unloading valve at this time, so that the first neutral unloading valve is communicated, and the hydraulic oil can be unloaded through the first neutral unloading valve and flows back to the hydraulic pump station. When the first control valve is reversed, the P1 end and the P end are communicated and the T end and the T1 end are communicated or the P1 end and the T end are communicated and the P end and the T1 end are communicated, thereby enabling the hydraulic oil flowing from the hydraulic pump station to the P end of the first control valve to flow to the second control end of the first neutral unloading valve through the P1 end and the T1 end. At this time, the hydraulic oil drives the first neutral unloading valve to be disconnected, so that the hydraulic oil cannot be unloaded through the first neutral unloading valve, and the hydraulic oil can be normally supplied and drive the motor to rotate. Therefore, by arranging the first neutral unloading valve, when the winch is on standby, the first neutral unloading valve is opened to enable the hydraulic oil to be unloaded through the first neutral 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, and when the motor needs to work, the first neutral unloading valve is disconnected by controlling the hydraulic oil flowing to the first control valve, thereby enabling the hydraulic oil to normally flow to the motor to act.

[0117] To drive the second motor to rotate, the second control valve is reversed to control the second motor to rotate forward or reverse, that is, the P end of the second control valve is connected to the A end and the B end is connected to the T end, 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, thereby realizing control of the second motor. Since the second neutral 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 reversed, the hydraulic oil in the second oil inlet pipeline flows into the first control end of the second neutral unloading valve at this time, so that the second neutral unloading valve is connected, and the hydraulic oil can be unloaded through the second neutral unloading valve and flow back to the hydraulic pump station; after the second control valve is reversed, the P1 end and the P end are connected, and the T end and the T1 end are connected, or the P1 end and the T end are connected, and the P end and the T1 end are connected, thereby enabling 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 neutral unloading valve through the P1 end and the T1 end at this time, and the hydraulic oil drives the second neutral unloading valve to be disconnected, so that the hydraulic oil cannot be unloaded through the second neutral unloading valve, and the hydraulic oil can be normally supplied and drive the second motor to rotate. Therefore, through the arrangement of the second neutral unloading valve, when the winch is on standby, the second neutral unloading valve is opened to enable the hydraulic oil to be unloaded through the second neutral 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, and when the second motor needs to work, the second neutral unloading valve is controlled to be disconnected through the hydraulic oil flowing to the second control valve, thereby enabling the hydraulic oil to normally flow to the second motor to act.

[0118] At the same time, by arranging the first unloading shuttle valve between the first oil way and the second oil way, when one of the motors works and the other motor is on standby, the hydraulic oil flows to the first unloading shuttle valve through the first control valve or the second control valve, so that the first port of the first unloading shuttle valve is connected to the third port or the second port is connected to the third port, thereby enabling the hydraulic oil to flow to the second control end of the first neutral unloading valve and the second control end of the second neutral unloading valve through the third port of the first unloading shuttle valve, thereby closing the neutral unloading valve, preventing the hydraulic oil from being unloaded by the neutral unloading valve when the winch works, resulting in insufficient oil pressure.

Claims

1. A method for oil extraction from a double winch, through an unloading system, said unloading system comprising a hydraulic pump station and a winch control system, said hydraulic pump station supplying oil to the winch control system, the winch control system driving the rotation of a motor and a second motor, characterized in that: The specific steps include: (1) the hydraulic pump station supplies oil to the winch control system, and the winch control system drives the motor and the second motor to operate; (10) when one of the motors needs to work and the other motor needs to be on standby; (11) the hydraulic oil flows to the first unloading spool valve through the first operating valve or the second operating valve, and the first port of the first unloading spool valve is in communication with the third port or the second port is in communication with the third port; (12) the hydraulic oil flows to the second control end of the first neutral unloading valve and the second control end of the second neutral unloading valve through the third port of the first unloading spool valve; (13) the first neutral unloading valve and the second neutral unloading valve are closed, and the hydraulic oil normally flows to the motor that needs to work and drives the motor to operate; (14) when the motor needs to be speeded up, the first manual reversing valve is driven to reverse, the first oil inlet pipeline 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 up; (15) when the second motor needs to be speeded up, the second manual reversing valve is driven to reverse, the second oil inlet pipeline and the motor are connected, and the hydraulic oil flows into the motor through the second manual reversing valve to increase the pressure and speed up; The winch control system includes a first oil circuit and a second oil circuit, the first oil circuit drives the motor to rotate, and the second oil circuit drives the second motor to rotate; The first oil circuit includes a first neutral unloading valve and a first operating valve, the oil outlet of the hydraulic pump station is connected to the P end of the first operating valve through a first oil outlet pipeline, the T end of the first operating 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 operating valve is connected to the first port of the motor, and the B end of the first operating valve is connected to the second port of the motor; A first neutral unloading valve is arranged between the first oil inlet pipeline and the first oil return pipeline, the oil inlet end of the first neutral unloading valve is connected to the first oil inlet pipeline, the oil outlet end of the first neutral unloading valve is connected to the first oil return pipeline, and the first control end of the first neutral unloading valve is connected to the first oil inlet pipeline; the P1 end and the T1 end of the first operating valve are connected to the second control end of the first neutral unloading valve, and when the first operating valve reverses, the P1 end and the P end are in communication, the T end and the T1 end are in communication, or the P1 end and the T end are in communication, and the P end and the T1 end are in communication; The second oil circuit includes a second neutral unloading valve and a second operating valve, the oil outlet of the hydraulic pump station is connected to the P end of the second operating valve through a second oil outlet pipeline, the T end of the second operating 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 operating valve is connected to the first port of the second motor, and the B end of the second operating valve is connected to the second port of the second motor; A second neutral unloading valve is arranged between the second oil inlet pipeline and the second oil return pipeline, the oil inlet end of the second neutral unloading valve is connected to the second oil inlet pipeline, the oil outlet end of the second neutral unloading valve is connected to the second oil return pipeline, and the first control end of the second neutral unloading valve is connected to the second oil inlet pipeline; the P1 end and the T1 end of the second operating valve are connected to the second control end of the second neutral unloading valve, and when the second operating valve reverses, the P1 end and the P end are in communication, the T end and the T1 end are in communication, or the P1 end and the T end are in communication, and the P end and the T1 end are in communication; A first unloading spool valve is arranged between the first oil passage and the second oil passage, a first port of the first unloading spool valve is connected with the P1 port and the T1 port of the first control valve, a second port of the first unloading spool valve is connected with the P1 port and the T1 port of the second control valve, and a third port of the first unloading spool valve is connected with the second control port of the first neutral unloading valve and the second control port of the second neutral unloading valve; The hydraulic pump station comprises an oil tank and a constant delivery pump, the oil inlet of the constant delivery pump is connected with the oil tank, the oil outlet of the constant delivery pump is connected with the first oil inlet pipeline and the second oil inlet pipeline through an oil outlet port, and the first oil return pipeline and the second oil return pipeline are connected with the oil tank through an oil return port; A first manual reversing valve is arranged between the first oil inlet pipeline and the motor, the oil inlet of the first manual reversing valve is connected with the hydraulic pump station through the first oil inlet pipeline, and the oil outlet of the first manual reversing valve is connected with the motor. A second manual reversing valve is arranged between the second oil inlet pipeline and the second motor, the oil inlet of the second manual reversing valve is connected with the hydraulic pump station through the second oil inlet pipeline, and the oil outlet of the second manual reversing valve is connected with the second motor.

2. A method of oil recovery from a dual draw works according to claim 1, characterised in that: A spring is further arranged on the second control port of the first neutral unloading valve, the spring pushes the internal oil passage of the first neutral unloading valve to disconnect the oil inlet and the oil outlet of the first neutral unloading valve. A second spring is further arranged on the second control port of the second neutral unloading valve, the second spring pushes the internal oil passage of the second neutral unloading valve to disconnect the oil inlet and the oil outlet of the second neutral unloading valve.

3. The method of claim 1, wherein: A first spool valve is arranged between the P1 port and the T1 port of the first control valve and the second control port of the first neutral unloading valve, a first port of the first spool valve is connected with the P1 port of the first control valve, a second port of the first spool valve is connected with the T1 port of the first control valve, and a third port of the first spool valve is connected with the second control port of the first neutral unloading valve. A second spool valve is arranged between the P1 port and the T1 port of the second control valve and the second control port of the second neutral unloading valve, a first port of the second spool valve is connected with the P1 port of the second control valve, a second port of the second spool valve is connected with the T1 port of the second control valve, and a third port of the second spool valve is connected with the second control port of the second neutral unloading valve.

4. A method of oil recovery from a dual draw works according to claim 3, characterised in that: A third spool valve is arranged between the second control port of the first neutral unloading valve and the third port of the first unloading spool valve, a first port of the third spool valve is connected with the third port of the first spool valve, a second port of the third spool valve is connected with the third port of the first unloading spool valve, and a third port of the third spool valve is connected with the second control port of the first neutral unloading valve. A fourth spool valve is arranged between the second control port of the second neutral unloading valve and the third port of the first unloading spool valve, a first port of the fourth spool valve is connected with the third port of the second spool valve, a second port of the fourth spool valve is connected with the third port of the first unloading spool valve, and a third port of the fourth spool valve is connected with the second control port of the second neutral unloading valve.

5. The method of claim 1, wherein: A first overflow valve is arranged between the second control port of the first neutral unloading valve and the first oil return pipeline, the oil inlet of the first overflow valve is connected with the second control port of the first neutral unloading valve, and the oil outlet of the first overflow valve is connected with the first oil return pipeline.

6. The method of claim 1, wherein: The first oil inlet pipeline is further provided with a first pressure reducing valve, an oil inlet end of the first pressure reducing valve is connected to an oil outlet of the hydraulic pump station through the first oil inlet pipeline, and an oil outlet end of the first pressure reducing valve is connected to a P end of the first control valve through the first oil inlet pipeline.

7. The method of claim 1, wherein: The quantitative pump comprises a first oil pump and a second oil pump, oil inlet ends of the first oil pump and the second oil pump are connected to the oil tank, and 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.

8. The method of claim 1, wherein: A second unloading spool valve is arranged between the first control valve and the first unloading spool valve, a first port of the second unloading spool valve is connected to a P1 end of the first control valve, a second port of the second unloading spool valve is connected to a T1 end of the first control valve, and a third port of the second unloading spool valve is connected to a first port of the first unloading valve. A third unloading spool valve is arranged between the second control valve and the first unloading spool valve, a first port of the third unloading spool valve is connected to a P1 end of the second control valve, a second port of the third unloading spool valve is connected to a T1 end of the second control valve, and a third port of the third unloading spool valve is connected to a second port of the first unloading valve.

9. The method of claim 1, wherein: The first oil inlet pipeline is further provided with a third pressure reducing valve, an oil inlet end of the third pressure reducing valve is connected to the first oil inlet pipeline, and an oil outlet end of the third pressure reducing valve is connected to an oil inlet end of the first manual reversing valve.

10. The method of claim 1, wherein: After step (1), the method further comprises: (2) when the winch is in 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) hydraulic oil in the first oil inlet pipeline flows into a first control end of the first mid-position unloading valve, and hydraulic oil in the second oil inlet pipeline flows into a first control end of the second mid-position unloading valve; (5) the first mid-position unloading valve is connected, and the hydraulic oil in the first oil inlet pipeline is unloaded through the first mid-position unloading valve and flows back to the hydraulic pump station; the second mid-position unloading valve is connected, and the hydraulic oil in the second oil inlet pipeline flows back to the hydraulic pump station through the second mid-position unloading valve; (6) when the winch is started; (7) the first control valve and the second control valve are reversed; (71) when it is necessary to control the rotation of the motor; (711) when it is necessary to control the forward rotation of the motor, 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 through the B end of the first control valve from the second port, 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 reverse rotation of the motor, 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, 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 through the A end of the first control valve from the first port, 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 forward rotation of the second motor, 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 through the B end of the second control valve from the second port, 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 the second motor needs to be controlled to reverse, the P port of the second control valve is communicated with the B port and the A port is communicated with the T port, the hydraulic oil flows into the second port of the second motor through the B port of the second control valve and flows back to the oil tank through the A port of the second control valve; the P1 port and the T port of the second control valve are communicated, and the P port and the T1 port are communicated; (8) In the first oil inlet pipeline, part of the hydraulic oil flows to the motor through the first control valve, and part of the hydraulic oil flows to the second control end of the first neutral load valve through the P1 port or the T1 port of the first control valve to drive the first neutral load valve to be disconnected, so that the hydraulic oil cannot flow back to the oil tank through the first neutral load valve; In the second oil inlet pipeline, part of the hydraulic oil 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 neutral load valve through the P1 port or the T1 port of the second control valve to drive the second neutral load valve to be disconnected, so that the hydraulic oil cannot flow back to the oil tank through the second neutral load 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 act.

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