Hydraulic system of movable skin cleaning machine

Abstract

The utility model discloses a hydraulic system of a movable skin cleaning machine, which is characterized in that an oil tank sequentially passes through an oil pump and a lifting driving loop and then flows back to the oil tank, the oil tank further sequentially passes through the oil pump and an inclination angle driving loop and then flows back to the oil tank, and the oil tank further sequentially passes through the oil pump and a rolling brush driving loop and then flows back to the oil tank. The hydraulic system can control the rolling brush lifting device on the movable skin cleaning machine to act and control the lifting height of the rolling brush lifting device. The hydraulic system can control the tray turnover device on the movable skin cleaning machine to act and control the tray turnover device to turn over a tray. The hydraulic system can control the rolling brush device and the rolling brush driving device on the movable outer skin cleaning machine to act and control the rolling brush device to conduct rolling brush movement to clean the outer skin of the vehicle, the hydraulic system can also push the rolling brush device out of the vehicle body to the outer skin position of the vehicle through the rolling brush driving device, and hydraulic driving of the movable outer skin cleaning machine is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of car body skin cleaning, more particularly, a kind of mobile skin cleaning machine hydraulic system is particularly related to the technical field of car body skin cleaning. BACKGROUND

[0002] At present, domestic cleaning high-speed rail, bus, train and other equipment is manually cleaned or cleaned using fixed car washer, and the fixed car washer has poor flexibility, occupies a large area and is very troublesome to install. Manual cleaning is low in efficiency and high in labor cost. When designing a mobile skin cleaning machine, the power components for cleaning and lifting need to be controlled by a hydraulic system, so a hydraulic system for a mobile skin cleaning machine needs to be designed. UTILITY MODEL CONTENT

[0003] The utility model mainly solves the technical problems existing in the prior art, and provides a mobile skin cleaning machine hydraulic system capable of conveniently cleaning the car body skin.

[0004] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0005] The mobile skin cleaning machine hydraulic system of the utility model is used for controlling the action of mobile skin cleaning machine, and includes oil tank, oil pump, lifting drive circuit, inclination angle drive circuit and rolling brush drive circuit. The oil tank is returned to the oil tank through the oil pump and the lifting drive circuit in sequence. The oil tank is also returned to the oil tank through the oil pump and the inclination angle drive circuit in sequence. The oil tank is also returned to the oil tank through the oil pump and the rolling brush drive circuit in sequence.

[0006] The lifting drive circuit is used for driving the rolling brush lifting device on the mobile skin cleaning machine to act.

[0007] The inclination angle drive circuit is used for driving the tray turnover device on the mobile skin cleaning machine to act.

[0008] The rolling brush drive circuit is used for driving the rolling brush device and the rolling brush drive device on the mobile skin cleaning machine to act.

[0009] Optionally, the lifting drive circuit includes lifting oil cylinder, first two-position two-way valve, first throttle valve group, second two-position two-way valve, third two-position two-way valve and second throttle valve. The outlet of the oil pump is communicated with the lifting oil cylinder through the second two-position two-way valve, the second throttle valve, the first throttle valve group, the first two-position two-way valve, and the outlet of the second throttle valve is also communicated with the oil tank through the third two-position two-way valve.

[0010] When the first two-position two-way valve is in the left position, the P port of the first two-position two-way valve is in communication with the A port of the first two-position two-way valve; when the first two-position two-way valve is in the right position, the A port of the first two-position two-way valve is in communication with the P port of the first two-position two-way valve through an internal one-way valve, and the P port of the first two-position two-way valve is also in communication with the control end of the first two-position two-way valve in the left position;

[0011] When the second two-position two-way valve is in the left position, the P port of the second two-position two-way valve is in communication with the A port of the second two-position two-way valve through an internal throttle; when the second two-position two-way valve is in the right position, the P port of the second two-position two-way valve and the A port of the second two-position two-way valve are mutually blocked;

[0012] When the third two-position two-way valve is in the left position, the A port of the third two-position two-way valve is in communication with the P port of the third two-position two-way valve through an internal one-way valve, and the A port of the third two-position two-way valve is also in communication with the P port of the third two-position two-way valve through an internal throttle; when the third two-position two-way valve is in the right position, the P port of the third two-position two-way valve is in communication with the A port of the third two-position two-way valve through an internal one-way valve.

[0013] Optionally, the first throttle valve group comprises a first throttle valve, a first one-way valve and a pressure reducing valve; the P port of the first throttle valve group is in communication with the A port of the first throttle valve group through the first throttle valve and the first one-way valve, and the first one-way valve is further connected in parallel with the pressure reducing valve.

[0014] Optionally, the A port of the second two-position two-way valve is in communication with the oil tank through a second one-way valve and an overflow valve.

[0015] Optionally, the tilt drive circuit comprises a first three-position four-way valve and two tilt drive oil cylinders, the A port of the first three-position four-way valve is in communication with the rodless chambers of the two tilt drive oil cylinders, the B port of the first three-position four-way valve is in communication with the rod chambers of the two tilt drive oil cylinders, the P port of the first three-position four-way valve is in communication with the oil pump, and the T port of the first three-position four-way valve is in communication with the oil tank.

[0016] When the first three-position four-way valve is in the middle position, the P port of the first three-position four-way valve, the T port of the first three-position four-way valve, the A port of the first three-position four-way valve and the B port of the first three-position four-way valve are mutually blocked.

[0017] When the first three-position four-way valve is in the left position, the P port of the first three-position four-way valve is in communication with the A port of the first three-position four-way valve, and the B port of the first three-position four-way valve is in communication with the T port of the first three-position four-way valve.

[0018] When the first three-position four-way valve is in the right position, the P port of the first three-position four-way valve is in communication with the B port of the first three-position four-way valve, and the A port of the first three-position four-way valve is in communication with the T port of the first three-position four-way valve.

[0019] Optionally, the A port of the first three-position four-way valve and the B port of the first three-position four-way valve are both communicated with the oil tank through the first shuttle valve, the third one-way valve and the overflow valve.

[0020] Optionally, the rolling brush driving circuit comprises a fourth two-position two-way valve, a hydraulic motor and a rolling brush driving cylinder, the B port of the fourth two-position two-way valve and the A port of the fourth two-position two-way valve are respectively communicated with the inlet and the outlet of the hydraulic motor, the B port of the fourth two-position two-way valve is also communicated with the rodless cavity of the rolling brush driving cylinder, the P port of the fourth two-position two-way valve is communicated with the oil pump, and the T port of the fourth two-position two-way valve is communicated with the oil tank.

[0021] When the fourth two-position two-way valve is in the left position, the P port of the fourth two-position two-way valve, the T port of the fourth two-position two-way valve, the A port of the fourth two-position two-way valve and the B port of the fourth two-position two-way valve are mutually blocked.

[0022] When the fourth two-position two-way valve is in the right position, the P port of the fourth two-position two-way valve is communicated with the B port of the fourth two-position two-way valve, and the A port of the fourth two-position two-way valve is communicated with the T port of the fourth two-position two-way valve.

[0023] Optionally, the A port of the fourth two-position two-way valve and the B port of the fourth two-position two-way valve are both communicated with the oil tank through the second shuttle valve, the fourth one-way valve and the overflow valve.

[0024] Optionally, the valve bodies in the lifting driving circuit, the inclination driving circuit and the rolling brush driving circuit are integrated on a valve body assembly.

[0025] Optionally, the oil pump is also communicated with the oil tank through a fifth two-position two-way valve.

[0026] When the fifth two-position two-way valve is in the left position, the P port of the fifth two-position two-way valve is communicated with the A port of the fifth two-position two-way valve; when the fifth two-position two-way valve is in the right position, the P port of the fifth two-position two-way valve is mutually blocked with the A port of the fifth two-position two-way valve; and the P port of the fifth two-position two-way valve is also communicated with the left position control end of the fifth two-position two-way valve.

[0027] By setting the lifting driving circuit, the hydraulic system can control the action of the rolling brush lifting device on the mobile outer skin cleaning machine, and control the lifting height of the rolling brush lifting device; by setting the inclination driving circuit, the hydraulic system can control the action of the tray turnover device on the mobile outer skin cleaning machine, and control the turnover of the tray by the tray turnover device; by setting the rolling brush driving circuit, the hydraulic system can control the action of the rolling brush device and the rolling brush driving device on the mobile outer skin cleaning machine, and control the rolling brush device to perform rolling brush movement to clean the vehicle outer skin, and the hydraulic system can also push the rolling brush device out of the vehicle body to the vehicle outer skin position by the rolling brush driving device, thereby realizing the hydraulic driving of the mobile outer skin cleaning machine. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 is a structural schematic diagram of a mobile outer skin cleaning machine of the present application;

[0030] Figure 2 is a structural schematic diagram of the position of the roller brush device in the present application;

[0031] Figure 3 is a structural schematic diagram of the roller brush lifting device in the present application

[0032] Figure 4 is a hydraulic principle diagram of the hydraulic system of the mobile outer skin cleaning machine in the present application. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0034] Referring to Figure 1 , Figure 2 , the mobile outer skin cleaning machine comprises a roller brush device A, a roller brush driving device B, a tray overturning device C and a roller brush lifting device D, the roller brush device A has a roller brush A1 thereon, which needs a hydraulic system to drive its rotation to drive the roller brush A1 to clean the outer skin of the vehicle body, the roller brush driving device B is used to push the roller brush device A out of the cleaning machine to the position of the outer skin of the vehicle body when the roller brush device A works, and the roller brush driving device B is used to retract the roller brush device A into the cleaning machine when the cleaning is finished, the tray overturning device C is used to drive the bottom tray C1 in the cleaning machine to deflect, and the tray overturning device C drives the outside of the bottom tray C1 to rise when working, so as to collect the sewage falling into the bottom tray C1, and the roller brush lifting device D is used to drive the roller brush device A to lift when cleaning the outer skin of the vehicle body of different heights.

[0035] In order to realize the action of the above-mentioned device, referring to Figure 3As shown, the utility model provides a kind of mobile skin cleaning machine hydraulic system for controlling mobile skin cleaning machine action, including oil tank 1, oil pump 2, lifting drive circuit 3, angle drive circuit 4 and roll brush drive circuit 5, the oil tank 1 is sequentially backflowed to oil tank 1 by oil pump 2, lifting drive circuit 3, the oil tank 1 is also sequentially backflowed to oil tank 1 by oil pump 2, angle drive circuit 4, the oil tank 1 is also sequentially backflowed to oil tank 1 by oil pump 2, roll brush drive circuit 5;

[0036] By setting lifting drive circuit 3, the hydraulic system can control the action of the roll brush lifting device D on the mobile skin cleaning machine, control the lifting height of the roll brush lifting device D;Angle drive circuit 4 is provided, and the hydraulic system can control the action of the tray turnover device C on the mobile skin cleaning machine, control the tray turnover device C to overturn the tray C1;Roll brush drive circuit 5 is provided, and the hydraulic system can control the action of the roll brush device A and the roll brush driving device B on the mobile skin cleaning machine, control the roll brush device A to perform roll brush movement to clean the vehicle skin, and the hydraulic system can also push the roll brush device A out of the vehicle body to the external vehicle skin position by the roll brush driving device B, to realize the hydraulic drive of the mobile skin cleaning machine.

[0037] Referring to Figure 1 、 Figure 2 、 Figure 4 As shown in one embodiment of the present disclosure, the lifting drive circuit 3 includes lifting cylinder 31, first two-position two-way valve 32, first throttle valve group 33, second two-position two-way valve 34, third two-position two-way valve 35 and second throttle valve 36, the outlet of the oil pump 2 is communicated with the lifting cylinder 31 through the second two-position two-way valve 34, the second throttle valve 36, the first throttle valve group 33, the first two-position two-way valve 32, and the outlet of the second throttle valve 36 is also communicated with the oil tank 1 through the third two-position two-way valve 35;

[0038] When the first two-position two-way valve 32 is in the left position, the P port of the first two-position two-way valve 32 is communicated with the A port of the first two-position two-way valve 32;When the first two-position two-way valve 32 is in the right position, the A port of the first two-position two-way valve 32 is communicated with the P port of the first two-position two-way valve 32 through the valve internal one-way valve, and the P port of the first two-position two-way valve 32 is also communicated with the control end of the first two-position two-way valve 32 in the left position;

[0039] When the second two-position two-way valve 34 is in the left position, the P port of the second two-position two-way valve 34 is communicated with the A port of the second two-position two-way valve 34 through the valve internal throttle port;When the second two-position two-way valve 34 is in the right position, the P port of the second two-position two-way valve 34 and the A port of the second two-position two-way valve 34 are mutually cut off;

[0040] When the third two-position two-way valve 35 is in the left position, port A of the third two-position two-way valve 35 is connected to port P of the third two-position two-way valve 35 through the internal check valve, and port A of the third two-position two-way valve 35 is also connected to port P of the third two-position two-way valve through the internal throttling port; when the third two-position two-way valve 35 is in the right position, port P of the third two-position two-way valve 35 is connected to port A of the third two-position two-way valve 35 through the internal check valve.

[0041] When lifting is required, the second two-position two-way valve 34 is in the left position, and the hydraulic oil enters the rodless chamber of the lifting cylinder 31 after passing through the oil pump 2, the left position of the second two-position two-way valve 34, the first throttle valve group 33, and the right position of the first two-position two-way valve.

[0042] When descent is required, the second two-position two-way valve 34 is in the left position. The hydraulic oil flows from the rodless chamber of the cylinder 31 through the left position of the first two-position two-way valve, the first throttle valve group 33, and the left position of the third two-position two-way valve 35 before returning to the tank 1.

[0043] Preferably, the first throttle valve assembly 33 includes a first throttle valve 331, a first check valve 332, and a pressure reducing valve 333. The P port of the first throttle valve assembly 33 is connected to the A port of the first throttle valve assembly 33 via the first throttle valve 331 and the first check valve 332. A pressure reducing valve 333 is also connected in parallel to the first check valve 332. When lifting is required, the oil flowing through the P port of the first throttle valve assembly 33 flows out through the first throttle valve 331 and the first check valve 332. When lowering is required, the oil flowing through the A port of the first throttle valve assembly 33 flows out through the pressure reducing valve 333 and the first check valve 332.

[0044] The A port of the second two-position two-way valve 34 is also connected to the oil tank 1 through the second one-way valve 37 and the overflow valve 6. When the oil pressure in the working circuit is too high, the oil through the A port of the second two-position two-way valve 34 flows back to the oil tank 1 through the second one-way valve 37 and the overflow valve 6 to protect the safety of the working oil circuit.

[0045] See Figure 1 , Figure 4 As shown, the tilt drive circuit 4 includes a first three-position four-way valve 41 and two tilt drive cylinders 42. The A port of the first three-position four-way valve 41 is connected to the rodless chamber of the two tilt drive cylinders 42, the B port of the first three-position four-way valve 41 is connected to the rod chamber of the two tilt drive cylinders 42, the P port of the first three-position four-way valve 41 is connected to the oil pump 2, and the T port of the first three-position four-way valve 42 is connected to the oil tank 1.

[0046] When the first three-position four-way valve 41 is in the neutral position, the P port, T port, A port and B port of the first three-position four-way valve 41 are mutually blocked.

[0047] When the first three-position four-way valve 41 is in the left position, the P port of the first three-position four-way valve 41 communicates with the A port of the first three-position four-way valve 41, and the B port of the first three-position four-way valve 41 communicates with the T port of the first three-position four-way valve 41.

[0048] When the first three-position four-way valve 41 is in the right position, the P port of the first three-position four-way valve 41 communicates with the B port of the first three-position four-way valve 41, and the A port of the first three-position four-way valve 41 communicates with the T port of the first three-position four-way valve 41.

[0049] When it is necessary to drive the tray turnover device C to turn over, the first three-position four-way valve 41 is in the left position, and the oil enters the rod cavity of the two inclination drive oil cylinders 42 after passing through the P port and the A port of the first three-position four-way valve 41 and the oil pump 2, so that the extension rod of the inclination drive oil cylinder 42 extends;

[0050] When it is necessary to drive the tray turnover device C to reset, the first three-position four-way valve 41 is in the right position, and the oil in the rod cavity of the two inclination drive oil cylinders 42 returns to the oil tank after passing through the B port and the T port of the first three-position four-way valve 41.

[0051] Preferably, the A port of the first three-position four-way valve 41 and the B port of the first three-position four-way valve 41 both communicate with the oil tank 1 after passing through the first shuttle valve 43, the third one-way valve 44 and the overflow valve 6. When the working oil circuit pressure is too large, the oil returns to the oil tank 1 after passing through the first shuttle valve 43, the third one-way valve 44 and the overflow valve 6, thereby protecting the safety of the working oil circuit.

[0052] In another embodiment, referring to FIG. 5, Figure 1 、 Figure 2 、 Figure 4 As shown in the figure, the rolling brush driving circuit 5 includes a fourth two-position two-way valve 51, a hydraulic motor 52 and a rolling brush driving oil cylinder 53. The B port of the fourth two-position two-way valve 51 and the A port of the fourth two-position two-way valve 51 respectively communicate with the inlet and outlet of the hydraulic motor 52. The B port of the fourth two-position two-way valve 51 also communicates with the rodless cavity of the rolling brush driving oil cylinder 53. The P port of the fourth two-position two-way valve 51 communicates with the oil pump 2, and the T port of the fourth two-position two-way valve 51 communicates with the oil tank 1.

[0053] When the fourth two-position two-way valve 51 is in the left position, the P port of the fourth two-position two-way valve 51, the T port of the fourth two-position two-way valve 51, the A port of the fourth two-position two-way valve 51 and the B port of the fourth two-position two-way valve 51 are mutually blocked.

[0054] When the fourth two-position two-way valve 51 is in the right position, the P port of the fourth two-position two-way valve 51 communicates with the B port of the fourth two-position two-way valve 51, and the A port of the fourth two-position two-way valve 51 communicates with the T port of the fourth two-position two-way valve 51.

[0055] When the brush driving device B and the brush device A need to be driven, the fourth two-position two-way valve 51 is in the right position, the hydraulic oil passes through the P port and the B port of the fourth two-position two-way valve 51 after passing through the oil pump 2, and then enters the hydraulic motor 52 and the brush driving oil cylinder 53, respectively, the hydraulic motor 52 drives the brush A1 to rotate, and the brush driving oil cylinder 53 is used to push the brush device A out of the cleaning machine to the position of the outer skin of the vehicle body to be cleaned.

[0056] Preferably, the A port of the fourth two-position two-way valve 51 and the B port of the fourth two-position two-way valve 51 are both communicated with the oil tank 1 through the second shuttle valve 54, the fourth one-way valve 55 and the overflow valve 6. When the pressure in the working circuit is relatively large, the high-pressure oil can flow back to the oil tank 1 through the second shuttle valve 54, the fourth one-way valve 55 and the overflow valve 6, thereby ensuring the safety of the working circuit.

[0057] In another preferred embodiment, the valve bodies in the lifting driving circuit 3, the inclination driving circuit 4 and the brush driving circuit 5 are integrated on the valve body assembly, which facilitates integrated control and unified installation of the oil pipe joints and the power connection of the electromagnetic valves.

[0058] The oil pump 1 is also communicated with the oil tank 1 through the fifth two-position two-way valve 7; when the fifth two-position two-way valve 7 is in the left position, the P port of the fifth two-position two-way valve 7 is communicated with the A port of the fifth two-position two-way valve 7; when the fifth two-position two-way valve 7 is in the right position, the P port of the fifth two-position two-way valve 7 and the A port of the fifth two-position two-way valve 7 are mutually blocked; the P port of the fifth two-position two-way valve 7 is also communicated with the left position control end of the fifth two-position two-way valve 7. When the subsequent pipeline is congested and the oil pressure is too high, the high-pressure oil output by the oil pump 2 can drive the fifth two-position two-way valve 7 to be in the left position, and the high-pressure oil flows back to the mailbox, thereby preventing the pipeline or the element from being damaged due to high pressure in the subsequent working circuit.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement without creative labor should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. A mobile skin washing machine hydraulic system for controlling the operation of a mobile skin washing machine, characterized in that, The oil tank, the oil pump, the lifting drive circuit, the inclination drive circuit and the rolling brush drive circuit are included, the oil tank outlet is communicated with the oil tank inlet through the oil pump, the lifting drive circuit and the oil pump in sequence, the oil tank outlet is also communicated with the oil tank inlet through the oil pump, the inclination drive circuit and the oil pump in sequence, and the oil tank outlet is also communicated with the oil tank inlet through the oil pump, the rolling brush drive circuit and the oil pump in sequence. The lifting drive circuit is used for driving the rolling brush lifting device on the mobile outer skin cleaning machine to act. The inclination drive circuit is used for driving the tray overturning device on the mobile outer skin cleaning machine to act. The rolling brush drive circuit is used for driving the rolling brush device and the rolling brush driving device on the mobile outer skin cleaning machine to act.

2. The mobile skin washing machine hydraulic system of claim 1, wherein: The lifting drive circuit includes a lifting oil cylinder, a first two-position two-way valve, a first throttle valve group, a second two-position two-way valve, a third two-position two-way valve and a second throttle valve, the outlet of the oil pump is communicated with the lifting oil cylinder through the second two-position two-way valve, the second throttle valve, the first throttle valve group and the first two-position two-way valve, and the outlet of the second throttle valve is also communicated with the oil tank through the third two-position two-way valve. When the first two-position two-way valve is in the left position, the P port of the first two-position two-way valve is communicated with the A port of the first two-position two-way valve, when the first two-position two-way valve is in the right position, the A port of the first two-position two-way valve is communicated with the P port of the first two-position two-way valve through the valve internal one-way valve, and the P port of the first two-position two-way valve is also communicated with the control end of the first two-position two-way valve in the left position. When the second two-position two-way valve is in the left position, the P port of the second two-position two-way valve is communicated with the A port of the second two-position two-way valve through the valve internal throttle port, and when the second two-position two-way valve is in the right position, the P port of the second two-position two-way valve and the A port of the second two-position two-way valve are mutually cut off. When the third two-position two-way valve is in the left position, the A port of the third two-position two-way valve is communicated with the P port of the third two-position two-way valve through the valve internal one-way valve, and the A port of the third two-position two-way valve is also communicated with the P port of the third two-position two-way valve through the valve internal throttle port, and when the third two-position two-way valve is in the right position, the P port of the third two-position two-way valve is communicated with the A port of the third two-position two-way valve through the valve internal one-way valve.

3. The mobile skin washing machine hydraulic system of claim 2, wherein: The first throttle valve group includes a first throttle valve, a first one-way valve and a pressure reducing valve, the P port of the first throttle valve group is communicated with the A port of the first throttle valve group through the first throttle valve and the first one-way valve, and the first one-way valve is also connected with the pressure reducing valve in parallel.

4. The mobile skin washing machine hydraulic system of claim 2, wherein: The A port of the second two-position two-way valve is communicated with the oil tank through the second one-way valve and the overflow valve.

5. The mobile skin washing machine hydraulic system of claim 1, wherein: The inclination drive circuit includes a first three-position four-way valve and two inclination drive oil cylinders, the A port of the first three-position four-way valve is communicated with the rodless chambers of the two inclination drive oil cylinders, the B port of the first three-position four-way valve is communicated with the rod chambers of the two inclination drive oil cylinders, the P port of the first three-position four-way valve is communicated with the oil pump, and the T port of the first three-position four-way valve is communicated with the oil tank. When the first three-position four-way valve is in the middle position, the P port of the first three-position four-way valve, the T port of the first three-position four-way valve, the A port of the first three-position four-way valve and the B port of the first three-position four-way valve are mutually cut off. When the first three-position four-way valve is in the left position, the P port of the first three-position four-way valve is in communication with the A port of the first three-position four-way valve, and the B port of the first three-position four-way valve is in communication with the T port of the first three-position four-way valve. When the first three-position four-way valve is in the right position, the P port of the first three-position four-way valve is in communication with the B port of the first three-position four-way valve, and the A port of the first three-position four-way valve is in communication with the T port of the first three-position four-way valve.

6. The mobile hide washing machine hydraulic system of claim 5, wherein: The A port of the first three-position four-way valve and the B port of the first three-position four-way valve are both in communication with the oil tank through a first shuttle valve, a third one-way valve, and an overflow valve.

7. The mobile hide washing machine hydraulic system of claim 3, wherein: The rolling brush driving circuit comprises a fourth two-position two-way valve, a hydraulic motor, and a rolling brush driving cylinder, the B port of the fourth two-position two-way valve and the A port of the fourth two-position two-way valve are respectively in communication with the inlet and the outlet of the hydraulic motor, the B port of the fourth two-position two-way valve is also in communication with the rodless chamber of the rolling brush driving cylinder, the P port of the fourth two-position two-way valve is in communication with the oil pump, and the T port of the fourth two-position two-way valve is in communication with the oil tank. When the fourth two-position two-way valve is in the left position, the P port of the fourth two-position two-way valve, the T port of the fourth two-position two-way valve, the A port of the fourth two-position two-way valve, and the B port of the fourth two-position two-way valve are mutually blocked. When the fourth two-position two-way valve is in the right position, the P port of the fourth two-position two-way valve is in communication with the B port of the fourth two-position two-way valve, and the A port of the fourth two-position two-way valve is in communication with the T port of the fourth two-position two-way valve.

8. The mobile skin washing machine hydraulic system of claim 7, wherein: The A port of the fourth two-position two-way valve and the B port of the fourth two-position two-way valve are both in communication with the oil tank through a second shuttle valve, a fourth one-way valve, and an overflow valve.

9. The mobile hide washing machine hydraulic system of claim 1, wherein: The valve bodies in the lifting driving circuit, the inclination driving circuit, and the rolling brush driving circuit are all integrated on the valve body assembly.

10. The mobile skin washing machine hydraulic system of claim 5, wherein: The oil pump is also in communication with the oil tank through a fifth two-position two-way valve. When the fifth two-position two-way valve is in the left position, the P port of the fifth two-position two-way valve is in communication with the A port of the fifth two-position two-way valve; when the fifth two-position two-way valve is in the right position, the P port of the fifth two-position two-way valve is mutually blocked with the A port of the fifth two-position two-way valve; and the P port of the fifth two-position two-way valve is also in communication with the left position control end of the fifth two-position two-way valve.

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