Hydraulic system of aircraft refueling truck and aircraft refueling truck

Abstract

The invention discloses a hydraulic system of an aircraft refueling truck and the aircraft refueling truck, and the hydraulic system of the aircraft refueling truck comprises an oil inlet pipeline, an oil return pipeline and a platform lifting assembly. An oil inlet of a first reversing valve in the platform lifting assembly is connected with an oil inlet pipeline, and an oil return opening is connected with an oil return pipeline. The first end of the first hydraulic control one-way valve is connected with a first oil outlet of the first reversing valve, and the second end of the first hydraulic control one-way valve is in driving connection with the platform. The control end of the hydraulic control one-way valve is connected with a second oil outlet of the first reversing valve, one end of the first damping valve is connected with the joint of the control end of the first hydraulic control one-way valve and the second oil outlet of the first reversing valve, and the other end of the first damping valve is connected with an oil return pipeline. When the first reversing valve is in the first state, the oil inlet and the first oil outlet are communicated, when the first reversing valve is in the second state, the oil inlet and the second oil outlet are communicated, the oil return opening and the first oil outlet are communicated, and the stability of the platform in the lifting process can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation refueling technology, and in particular to a hydraulic system of an aircraft refueling truck and the aircraft refueling truck. BACKGROUND

[0002] An airport is an important transportation hub connecting a city with the rest of the world. A large airport usually has a support oil depot and an underground refueling pipeline connecting the support oil depot and the parking space. The underground refueling pipeline cannot extend to every parking space, and an aircraft refueling truck is needed to connect between the ground well of the underground refueling pipeline and the parking space to supply oil to the aircraft, so as to support safe and stable operation of the airport.

[0003] The aircraft refueling truck has an upper assembly such as a refueling platform to assist aircraft refueling personnel in aircraft refueling work. When refueling is needed, the refueling platform needs to be raised to the height of the refueling port of the aircraft to facilitate the refueling of the staff. After the refueling is completed, the refueling platform needs to be lowered. In the related art, the refueling platform has the problem of unstable lifting, which affects the refueling experience of the aircraft refueling personnel. SUMMARY

[0004] The present application provides a hydraulic system of an aircraft refueling truck and the aircraft refueling truck to solve at least some of the problems in the related art.

[0005] In one aspect, the present application provides a hydraulic system of an aircraft refueling truck, comprising: an oil inlet pipeline, an oil return pipeline, and a platform lifting assembly, the platform lifting assembly comprising: a first reversing valve, an oil inlet of the first reversing valve being connected with the oil inlet pipeline, and an oil return of the first reversing valve being connected with the oil return pipeline; a first hydraulic control check valve, a first end of the first hydraulic control check valve being connected with a first oil outlet of the first reversing valve, a second end of the first hydraulic control check valve being connected with a platform drive, and a control end of the hydraulic control check valve being connected with a second oil outlet of the first reversing valve; a first damping valve, one end of the first damping valve being connected with a connection between the control end of the first hydraulic control check valve and the second oil outlet of the first reversing valve, and the other end of the first damping valve being connected with the oil return pipeline; When the first reversing valve is in the first state, the oil inlet and the first oil outlet are communicated, and the hydraulic oil drives the platform to rise through the first hydraulic control check valve; when the first reversing valve is in the second state, the oil inlet and the second oil outlet are communicated, and the oil return port and the first oil outlet are communicated, the first hydraulic control check valve is reversed, the hydraulic oil between the first hydraulic control check valve and the platform returns to the oil return pipeline through the first hydraulic control check valve, the first oil outlet and the oil return port, and the first damping valve is used to reduce the change speed of the pressure of the control end of the first hydraulic control check valve when the pressure of the hydraulic oil at the second oil outlet changes.

[0006] Optionally, a second reversing valve and a first one-way throttle valve assembly are further arranged between the first hydraulic control check valve and the platform, the first one-way throttle valve assembly comprises two one-way throttle valves opposite to each other, the oil inlet of the second reversing valve is connected with the second end of the first hydraulic control check valve, the first oil outlet of the second reversing valve is connected with the platform, the second oil outlet of the second reversing valve is connected with one of the one-way throttle valves, and the other one-way throttle valve is connected with the platform.

[0007] Optionally, a platform driving member is further arranged between the first hydraulic control check valve and the platform, the platform driving member comprises a first motor, a second motor, a first oil cylinder and a second oil cylinder, the first motor is drivingly connected with the first oil cylinder, the second motor is drivingly connected with the second oil cylinder, and the first motor and the second motor are synchronous motors.

[0008] Optionally, the hydraulic system further comprises a cantilever lifting assembly, and the cantilever lifting assembly comprises: a pressure reducing valve, a first end of the pressure reducing valve being connected with the first oil outlet of the first reversing valve; a second hydraulic control check valve, a first end of the second hydraulic control check valve being connected with a second end of the pressure reducing valve, a second end of the second hydraulic control check valve being connected with a cantilever, and a control end of the second hydraulic control check valve being connected with the second oil outlet of the first reversing valve; a third hydraulic control check valve, a first end of the third hydraulic control check valve being connected with the oil return pipeline, a second end of the third hydraulic control check valve being connected with the first end of the first hydraulic control check valve, and a control end of the third hydraulic control check valve being connected with the second oil outlet of the first reversing valve; a second damping valve, one end of the second damping valve being connected with a connection position between the control end of the second hydraulic control check valve, the control end of the third hydraulic control check valve and the second oil outlet of the first reversing valve, and the other end of the second damping valve being connected with the oil return pipeline.

[0009] Optionally, the cantilever lifting assembly further comprises a third reversing valve, an oil inlet of the third reversing valve is connected with one end of the first damping valve, an oil return of the third reversing valve is connected with the oil return pipeline, a first oil outlet of the third reversing valve is connected with the connection between the control end of the second hydraulic control check valve and the control end of the third hydraulic control check valve and one end of the second damping valve; when the third reversing valve is in a first state, the oil inlet and the first oil outlet of the third reversing valve are connected to connect the second oil outlet of the first reversing valve and the control end of the second hydraulic control check valve and the control end of the third hydraulic control check valve; when the third reversing valve is in a second state, the first oil outlet and the oil return of the third reversing valve are connected to connect the oil return pipeline and the control end of the second hydraulic control check valve and the control end of the third hydraulic control check valve.

[0010] Optionally, a first manual valve is further arranged between the second end of the first hydraulic control check valve and the oil return pipeline; and / or a second manual valve is further arranged between the second end of the second hydraulic control check valve and the oil return pipeline.

[0011] Optionally, the hydraulic system further comprises a ground well rubber pipe lifting assembly, the ground well rubber pipe lifting assembly comprising: a plurality of ground well rubber pipe driving members, each of the ground well rubber pipe driving members comprising an upstream check valve, a downstream check valve, a fourth hydraulic control check valve and a ground well rubber pipe oil cylinder; the upstream check valve is connected with the first end of the fourth hydraulic control check valve, the second end of the fourth hydraulic control check valve is connected with the ground well rubber pipe oil cylinder, and the ground well rubber pipe oil cylinder is connected with the downstream check valve; a fourth reversing valve, an oil inlet of the fourth reversing valve is connected with the oil inlet pipeline, and an oil outlet of the fourth reversing valve is connected with the oil return pipeline; a second oil outlet of the fourth reversing valve is connected with each of the plurality of upstream check valves, and a first oil outlet of the fourth reversing valve is connected with the control end of each of the plurality of fourth hydraulic control check valves.

[0012] Optionally, the hydraulic system further comprises an oil tank, a manual pressure booster, a three-way valve and two check valves, one end of the manual pressure booster is connected with the oil tank, the other end of the manual pressure booster is connected with an input end of the three-way valve, one of the output ends of the three-way valve is connected with each of the plurality of upstream check valves through one of the check valves, and the other output end of the three-way valve is connected with the platform driving through the other check valve.

[0013] Optionally, the hydraulic system further comprises a rotary table winding assembly, the rotary table winding assembly comprising: a winding motor; A fifth reversing valve, an oil inlet of the fifth reversing valve is connected with the oil inlet pipeline, an oil outlet of the fifth reversing valve is connected with the oil return pipeline; a second oil outlet of the fifth reversing valve is connected with the first end of the winding motor, a first oil outlet of the fifth reversing valve is connected with the second end of the winding motor; when the fifth reversing valve is in a first state, the oil inlet and the second oil outlet of the fifth reversing valve are connected, and the oil return outlet of the fifth reversing valve and the first oil outlet are connected; when the fifth reversing valve is in a second state, the oil inlet, the first oil outlet and the second oil outlet of the fifth reversing valve are connected.

[0014] Optionally, a valve and a second one-way throttle valve assembly connected in sequence are further arranged between the second end of the winding motor and the second oil outlet of the fifth reversing valve, and the second one-way throttle valve assembly comprises two reverse one-way throttle valves connected with each other.

[0015] Optionally, the hydraulic system further comprises an oil pump driving assembly, the oil pump driving assembly comprises an oil pump, a first end of the oil pump is connected with the third oil outlet of the first reversing valve, and a second end of the oil pump is connected with the oil return pipeline; when the first reversing valve is in a third state, the oil inlet and the third oil outlet of the first reversing valve are connected.

[0016] Optionally, the hydraulic system further comprises an air compressor driving assembly, the air compressor driving assembly comprises an air compressor and a sixth reversing valve, an oil inlet of the sixth reversing valve is connected with the third oil outlet of the first reversing valve, a first oil outlet of the sixth reversing valve is connected with the first end of the oil pump, a second oil outlet of the sixth reversing valve is connected with the first end of the air compressor, and a second end of the air compressor is connected with the oil return pipeline; when the sixth reversing valve is in a first state, the oil inlet and the first oil outlet of the sixth reversing valve are connected, and when the sixth reversing valve is in a second state, the oil inlet and the second oil outlet of the sixth reversing valve are connected.

[0017] Optionally, the hydraulic system further comprises an oil tank, a booster pump, a first one-way valve, a pressure gauge and a relief valve, one end of the booster pump is connected with the oil tank, the other end of the booster pump is connected with the first one-way valve, the first one-way valve is connected with the pressure gauge, the relief valve is connected between the first one-way valve and the pressure gauge, the relief valve is connected with the oil return pipeline, and the oil return pipeline is connected with the oil tank.

[0018] Another aspect of the present application provides an aircraft refueling vehicle, comprising the hydraulic system of the aircraft refueling vehicle.

[0019] The hydraulic system of the aircraft refueling vehicle and the aircraft refueling vehicle provided by the present application, the hydraulic system of the aircraft refueling vehicle comprises an oil inlet pipeline, an oil return pipeline and a platform lifting assembly, and the platform lifting assembly comprises a first reversing valve, a first hydraulic control one-way valve and a first damping valve.

[0020] The oil inlet of the first reversing valve is connected with the oil inlet pipeline, and the oil return port of the first reversing valve is connected with the oil return pipeline; the first end of the first hydraulic control check valve is connected with the first oil outlet of the first reversing valve, the second end of the first hydraulic control check valve is connected with the platform drive, and the control end of the hydraulic control check valve is connected with the second oil outlet of the first reversing valve.

[0021] When the first reversing valve is in the first state, the oil inlet and the first oil outlet are connected, and the hydraulic oil drives the platform to rise through the first hydraulic control check valve. During the rising of the platform, because the first hydraulic control check valve is unidirectional, the hydraulic oil can only move from the first end of the first hydraulic control check valve to the second end of the first hydraulic control check valve, and cannot move from the second end of the first hydraulic control check valve to the first end of the first hydraulic control check valve, so that the platform can be prevented from falling back during the rising of the platform or when the platform is kept at a fixed height, and the stability of the platform during the rising and keeping at the height is improved.

[0022] When the first reversing valve is in the second state, the oil inlet and the second oil outlet are connected, and the oil return port and the first oil outlet are connected. Because the control end of the first hydraulic control check valve is connected with the second oil outlet of the first reversing valve, the first hydraulic control check valve is reversely conducted, and the hydraulic oil can move from the second end of the first hydraulic control check valve to the first end of the first hydraulic control check valve. The hydraulic oil between the first hydraulic control check valve and the platform flows back to the oil return pipeline through the first hydraulic control check valve and the first oil outlet and the oil return port, so that the platform is lowered under the action of gravity.

[0023] The first damping valve is connected with the connection between the control end of the first hydraulic control check valve and the second oil outlet of the first reversing valve, and the other end of the first damping valve is connected with the oil return pipeline. When the pressure of the second oil outlet of the first reversing valve decreases, the pressure decrease speed of the control end of the first hydraulic control check valve is reduced, so that the platform is slowly stopped during the descending process, the platform shaking caused by the sudden stop of the platform during the descending process is avoided, and the operation stability of the platform during the descending process is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0025] Figure 1 A structure schematic diagram of a hydraulic system of an aircraft refueling vehicle shown in an embodiment of the application; Figure 2 A structure schematic diagram of a hydraulic system of an aircraft refueling vehicle shown in an embodiment of the application; Figure 3 A structure schematic diagram of a hydraulic system of an aircraft refueling vehicle shown in an embodiment of the application; Figure 2 A structure schematic diagram of a well hose pipe lifting assembly of a hydraulic system of an aircraft refueling vehicle shown in an embodiment of the application; Figure 4 Fig. 1 is a structural schematic diagram of a hydraulic system of an aircraft refueling truck. Figure 2 Fig. 2 is a structural schematic diagram of a rotary disc winding assembly of the hydraulic system of the aircraft refueling truck shown in Fig. 1.

[0026] BRIEF DESCRIPTION OF DRAWINGS: hydraulic system 2, oil inlet pipeline 21, oil return pipeline 22, platform lifting assembly 3, first directional valve 31, first hydraulic control check valve 32, first damping valve 33, second directional valve 34, first check throttle valve assembly 35, platform driving member 36, first motor 361, second motor 362, first oil cylinder 363, second oil cylinder 364, cantilever lifting assembly 4, pressure reducing valve 41, second hydraulic control check valve 42, third hydraulic control check valve 43, second damping valve 44, third directional valve 45, first manual valve 46, second manual valve 47, well hose lifting assembly 5, well hose driving member 51, upstream check throttle valve 52, downstream check throttle valve 53, fourth hydraulic control check valve 54, well hose oil cylinder 55, fourth directional valve 56, oil tank 61, manual pressure booster 62, three-way valve 63, check valve, rotary disc winding assembly 7, winding motor 71, fifth directional valve 72, valve 73, second check throttle valve assembly 74, oil pump driving assembly 8, oil pump 81, air compressor driving assembly 82, air compressor 83, sixth directional valve 84, pressure booster pump 91, first check valve 92, pressure gauge 93, overflow valve 94. DETAILED DESCRIPTION

[0027] The present application provides a hydraulic system of an aircraft refueling truck and the aircraft refueling truck. The hydraulic system of the aircraft refueling truck and the aircraft refueling truck of the present application are described in detail below with reference to the accompanying drawings. The features in the following embodiments and implementation examples can be combined with each other without conflict.

[0028] An aircraft refueling truck is a vehicle for refueling an aircraft on an aircraft parking apron. A well is generally provided in the aircraft parking apron. The aircraft refueling truck includes a well hose, a rotary disc, a platform, a cantilever, and an oil pump assembly. During refueling, the well hose is lowered into the well or connected to a well valve of the well. The well hose is connected to a refueling hose, and the refueling hose is wound on the rotary disc. The platform is raised to transport a refueling staff to the vicinity of a refueling port of the aircraft. The cantilever is raised to drive the refueling end of the refueling hose to the vicinity of the refueling port of the aircraft, so as to facilitate the refueling staff to align the refueling end of the refueling hose with the refueling port of the aircraft. Then, the oil pump is operated to fill the aviation oil in the well into the refueling port of the aircraft through the well hose and the refueling hose. After the refueling operation is completed, the platform and the cantilever are lowered, the well hose is raised to the home position, and the refueling hose is wound.

[0029] In order to facilitate control, the well hose, the rotary disc, the platform, the cantilever, and the oil pump assembly are all controlled by hydraulic pressure. In the related art, the refueling platform has the problem of unstable lifting, which affects the refueling experience of the aircraft refueling staff.

[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the hydraulic system 2 of an aircraft refueling truck according to one embodiment of this application. Figure 1 As shown, the hydraulic system 2 of the aircraft refueling vehicle provided in this application includes: an oil inlet pipe 21, an oil return pipe 22, and a platform lifting assembly 3. High-pressure hydraulic oil flows in the oil inlet pipe 21 to drive the platform lifting assembly 3. The oil return pipe 22 is connected to the oil tank 61 to facilitate the return of hydraulic oil to the oil tank 61.

[0031] Platform lifting component 3 includes: The first directional valve 31 has an oil inlet P connected to the oil inlet pipeline 21 and an oil return port T connected to the oil return pipeline 22. The first hydraulic check valve 32 has its first end connected to the first oil outlet A of the first directional valve 31, its second end connected to the platform drive, and its control end connected to the second oil outlet B of the first directional valve 31. The first damping valve 33 has one end connected to the control end of the first hydraulic check valve 32 and the connection point of the second oil outlet B of the first directional valve 31, and the other end connected to the return oil pipeline 22. When the first directional valve 31 is in the first state, the inlet port P and the first outlet port A are connected, and the hydraulic oil drives the platform to rise through the first pilot-operated check valve 32. During the platform's ascent, because the first pilot-operated check valve 32 is unidirectionally open, the hydraulic oil can only move from the first end of the first pilot-operated check valve 32 to the second end, and cannot move from the second end of the first pilot-operated check valve 32 to the first end. Therefore, when the platform rises or reaches a fixed height, it can prevent the platform from falling back, improving the stability of the platform during ascent and height maintenance.

[0032] When the first directional valve 31 is in the second state, it connects the inlet port P and the second outlet port B, and connects the return port T and the first outlet port A. Because the control end of the first hydraulically controlled check valve 32 is connected to the second outlet port B of the first directional valve 31, the first hydraulically controlled check valve 32 is reverse-biased. Hydraulic oil can move from the second end to the first end of the first hydraulically controlled check valve 32. The hydraulic oil between the first hydraulically controlled check valve 32 and the platform flows back to the return line 22 through the first hydraulically controlled check valve 32, the first outlet port A, and the return port T, causing the platform to descend under gravity. Thus, the descent control of the platform can be achieved simply by controlling the first directional valve 31 to switch from the first state to the second state, making the control method simple. In some embodiments, the first directional valve 31 is a pneumatically controlled directional valve; in other embodiments, the first directional valve 31 is an electrically controlled directional valve. This application does not impose any limitations on this.

[0033] The first damping valve 33 is connected with the connection between the control end of the first hydraulic control check valve 32 and the second oil outlet B of the first reversing valve 31, and the other end of the first damping valve 33 is connected with the oil return pipeline 22. The first damping valve 33 is used to reduce the change speed of the pressure of the control end of the first hydraulic control check valve 32 when the pressure of the hydraulic oil at the second oil outlet B is reduced. The platform is slowly stopped in the process of descending, the platform swing caused by the sudden stop of the platform in the process of descending is avoided, and the operation stability of the platform in the process of descending is improved.

[0034] In the embodiment of the application, the first damping valve 33 is a valve with a small through hole. Because one end of the first damping valve 33 is connected with the second oil outlet B of the first reversing valve 31, and the other end of the first damping valve 33 is connected with the oil return pipeline 22, when the first reversing valve 31 is in the second state, the second oil outlet B of the first reversing valve 31 is connected with the oil inlet P, and there is hydraulic pressure at the second oil outlet B. At this time, the first damping valve 33 can isolate the second oil outlet B of the first reversing valve 31 and the oil return pipeline 22, so as to avoid the influence of the hydraulic pressure at the second oil outlet B of the first reversing valve 31 on the oil return pipeline 22. When the first reversing valve 31 is switched, the hydraulic pressure at the second oil outlet B of the first reversing valve 31 is reduced or even disappears. Because the first damping valve 33 is a valve with a small through hole, the flow and the pressure flow away slowly, the disappearance speed of the pressure of the control end of the first hydraulic control check valve 32 can be reduced, and then when the second oil outlet B is not in the second state of the first reversing valve 31, the hydraulic pressure disappears to control the platform to stop descending, the platform is slowly stopped from descending, and the swing of the platform caused by the sudden stop of the platform is avoided.

[0035] Please continue to refer to Figure 1 , as shown in the embodiment Figure 1 , the first hydraulic control check valve 32 and the platform are further provided with a second reversing valve 34 and a first one-way throttling valve assembly 35. The first one-way throttling valve assembly 35 includes two one-way throttling valves opposite to each other. The oil inlet P of the second reversing valve 34 is connected with the second end of the first hydraulic control check valve 32, the first oil outlet A of the second reversing valve 34 is connected with the platform, and the second oil outlet B of the second reversing valve 34 is connected with one of the one-way throttling valves, and the other one-way throttling valve is connected with the platform.

[0036] By arranging the first one-way throttling valve assembly 35, the first one-way throttling valve assembly 35 includes two one-way throttling valves opposite to each other, the second oil outlet B of the second reversing valve 34 is connected with one of the one-way throttling valves, and the other one-way throttling valve is connected with the platform. The ascending and descending speeds of the platform can be adjusted.

[0037] A second directional control valve 34 is provided between the first hydraulic check valve 32 and the platform. The inlet P of the second directional control valve 34 is connected to the second end of the first hydraulic check valve 32, the first outlet A of the second directional control valve 34 is connected to the platform, and the second outlet B of the second directional control valve 34 is connected to one of the one-way throttle valves. By controlling the state of the second directional control valve 34, it can be connected to either the first hydraulic check valve 32 and the platform or to the first hydraulic check valve 32 and the first one-way throttle valve assembly 35. When the first one-way throttle valve assembly 35 is functioning properly, the second directional control valve 34 can be controlled to connect to both the first hydraulic check valve 32 and the first one-way throttle valve assembly 35. When the first one-way throttle valve assembly 35 fails and hydraulic oil cannot pass through it, the second directional control valve 34 can be controlled to connect directly to the platform via the first hydraulic check valve 32, thus controlling the platform's ascent and descent.

[0038] exist Figure 1 In the illustrated embodiment, a platform drive unit 36 ​​is further provided between the first hydraulic check valve 32 and the platform. The platform drive unit 36 ​​includes a first motor 361, a second motor 362, a first hydraulic cylinder 363, and a second hydraulic cylinder 364. The first motor 361 and the first hydraulic cylinder 363 are drivenly connected, and the second motor 362 and the second hydraulic cylinder 364 are drivenly connected. The first motor 361 and the second motor 362 are synchronous motors. In this patent application, the first hydraulic cylinder 363 and the second hydraulic cylinder 364 jointly drive the platform to lift and lower. Compared with related technologies that use a single hydraulic cylinder to drive the platform to lift and lower, two hydraulic cylinders can increase the number of connection points with the platform, making the platform more evenly stressed, preventing the platform from tilting during lifting and lowering, and improving the stability of the platform during lifting and lowering.

[0039] By synchronizing the movements of the first hydraulic cylinder 363 and the second hydraulic cylinder 364, in this patent application, the first motor 361 and the second motor 362 are synchronous motors, which allows the driving of the first hydraulic cylinder 363 by the first motor 361 and the driving of the second hydraulic cylinder 364 by the second motor 362 to be synchronized, thus synchronizing the first hydraulic cylinder 363 and the second hydraulic cylinder 364. In this patent application, by connecting the output shafts of the first motor 361 and the second motor 362 together, the first motor 361 and the second motor 362 are made synchronous motors. Figure 2 In the embodiment shown, pressure regulating valves are provided between the first motor 361 and the first oil cylinder 363, and between the second motor 362 and the second oil cylinder 364, which can adjust the pressure entering the first oil cylinder 363 and the pressure entering the second oil cylinder 364, thereby further improving the synchronization between the first oil cylinder 363 and the second oil cylinder 364.

[0040] exist Figure 1 In the illustrated embodiment, the hydraulic system 2 further includes a cantilever lifting assembly 4, which includes: The first end of the pressure reducing valve 41 is connected with the first oil outlet A of the first directional valve 31.

[0041] The first end of the second hydraulic control check valve 42 is connected with the second end of the pressure reducing valve 41, the second end of the second hydraulic control check valve 42 is connected with the cantilever, and the control end of the second hydraulic control check valve 42 is connected with the second oil outlet B of the first directional valve 31. The first end of the third hydraulic control check valve 43 is connected with the oil return pipeline 22, the second end of the third hydraulic control check valve 43 is connected with the first end of the first hydraulic control check valve 32, and the control end of the third hydraulic control check valve 43 is connected with the second oil outlet B of the first directional valve 31. The second end of the second damping valve 44 is connected with the oil return pipeline 22.

[0042] Because the first hydraulic control check valve 32 and the second hydraulic control check valve 42 are both connected with the first oil outlet A of the first directional valve 31, the hydraulic oil of the first oil outlet A of the first directional valve 31 is used to drive the platform and the cantilever to rise. The platform needs a larger hydraulic oil pressure, while the cantilever needs a smaller hydraulic oil pressure. In some specific embodiments, the hydraulic oil pressure for driving the platform to rise is 11 MPa, and the hydraulic oil pressure for driving the cantilever to rise is 6 MPa. In this patent application, by setting the pressure reducing valve 41, the first end of the pressure reducing valve 41 is connected with the first oil outlet A of the first directional valve 31, and the first end of the second hydraulic control check valve 42 is connected with the second end of the pressure reducing valve 41, the pressure at the first end of the second hydraulic control check valve 42 is adjusted to match the pressure required for driving the cantilever.

[0043] In this patent application, by setting the second hydraulic control check valve 42 and the third hydraulic control check valve 43, the control end of the second hydraulic control check valve 42 is connected with the second oil outlet B of the first directional valve 31, and the control end of the third hydraulic control check valve 43 is connected with the second oil outlet B of the first directional valve 31. When the first directional valve 31 is in the second state, the second oil outlet B has pressure, the control end of the second hydraulic control check valve 42 and the control end of the third hydraulic control check valve 43 both have pressure, and the second hydraulic control check valve 42 and the third hydraulic control check valve 43 are reversely conducted. The hydraulic oil between the first hydraulic control check valve 32 and the cantilever can be connected to the oil return pipeline 22 through the second hydraulic control check valve 42 and the third hydraulic control check valve 43, so that the cantilever can be lowered under the action of gravity.

[0044] The second damping valve 44 is a valve with a small orifice. When the first reversing valve 31 switches state and the hydraulic pressure at the second oil outlet B of the first reversing valve 31 disappears, because the second damping valve 44 is a valve with a small orifice, the flow and pressure flow away slowly, which can reduce the disappearance speed of the pressure at the control end of the second hydraulic control check valve 42 and the control end of the third hydraulic control check valve 43, and then when the first reversing valve 31 is not in the second state and the hydraulic pressure at the second oil outlet B disappears to control the cantilever to stop descending, the cantilever can slowly stop descending, avoiding the swing of the cantilever caused by the sudden stop of the cantilever.

[0045] In this patent application, the cantilever lifting assembly 4 and the platform lifting assembly 3 share the first oil outlet A of the first reversing valve 31 in the platform lifting assembly 3, so that when the first reversing valve 31 is in the first state, the hydraulic oil in the oil inlet pipeline 21 can not only drive the platform to rise, but also drive the cantilever to rise. And the cantilever lifting assembly 4 and the platform lifting assembly 3 share the second oil outlet B of the first reversing valve 31 in the platform lifting assembly 3, so that when the reversing valve is in the second state, not only can the first hydraulic control check valve 32 be reversely conducted, but also the second hydraulic control check valve 42 and the third hydraulic control check valve 43 can be reversely conducted, so that the platform and the cantilever can both descend. In this way, it meets the working condition that the platform and the cantilever need to rise before refueling and descend after refueling when the refueling truck is working.

[0046] As shown in Figure 1 The cantilever lifting assembly 4 further includes a third reversing valve 45. The oil inlet P of the third reversing valve 45 is connected to one end of the first damping valve 33, the oil return port T of the third reversing valve 45 is connected to the oil return pipeline 22, and the first oil outlet A of the third reversing valve 45 is connected to the connection between the control end of the second hydraulic control check valve 42, the control end of the third hydraulic control check valve 43 and one end of the second damping valve 44. When the third reversing valve 45 is in the first state, the oil inlet P and the first oil outlet A of the third reversing valve 45 are connected to connect the second oil outlet B of the first reversing valve 31 and the control end of the second hydraulic control check valve 42 and the control end of the third hydraulic control check valve 43. When the third reversing valve 45 is in the second state, the first oil outlet A and the oil return port T of the third reversing valve 45 are connected to connect the oil return pipeline 22 and the control end of the second hydraulic control check valve 42 and the control end of the third hydraulic control check valve 43.

[0047] Thus, when it is necessary to avoid the sudden stop of the cantilever, the third directional valve 45 can be controlled to be in the first state, so that the second damping valve 44 can avoid the sudden stop of the cantilever and improve the stability of the cantilever in the process of stopping and descending. In some emergency situations, the cantilever needs to stop descending immediately, the third directional valve 45 can be controlled to be in the second state, so that the hydraulic oil between the second damping valve 44 and the second and third hydraulic control check valves 42 and 43 can flow back to the oil return pipeline through the oil return port T of the third directional valve 45, so that the second and third hydraulic control check valves 42 and 43 are reversely blocked, avoiding further descending of the cantilever.

[0048] In Figure 1 the embodiment shown, a first manual valve 46 is further arranged between the second end of the first hydraulic control check valve 32 and the oil return pipeline 22. Thus, when the first hydraulic control check valve 32 fails or the first directional valve 31 fails or the hydraulic oil in the oil inlet pipeline 21 has no pressure and the platform cannot descend, the first manual valve 46 can be manually controlled to be opened, so that the hydraulic oil between the second end of the first hydraulic control check valve 32 and the platform enters the oil return pipeline 22, realizing the descending of the platform.

[0049] In Figure 1 the embodiment shown, a second manual valve 47 is further arranged between the second end of the second hydraulic control check valve 42 and the oil return pipeline 22. Thus, when the second hydraulic control check valve 42 fails or the third hydraulic control check valve 43 fails or the first directional valve 31 fails or the hydraulic oil in the oil inlet pipeline 21 has no pressure and the cantilever cannot descend, the second manual valve 47 can be manually controlled to be opened, so that the hydraulic oil between the second end of the second hydraulic control check valve 42 and the cantilever enters the oil return pipeline 22, realizing the descending of the cantilever.

[0050] Please refer to Figure 2 , Figure 2 the structural schematic diagram of the hydraulic system 2 of the aircraft refueling vehicle shown in another embodiment of the present application. As Figure 3 shown, the hydraulic system 2 further includes a well hose lifting assembly 5, a reel winding assembly 7, an oil pump driving assembly 8, and an air compressor driving assembly 82. The oil inlet pipeline 21 is connected with the well hose lifting assembly 5, the reel winding assembly 7, the oil pump driving assembly 8, and the air compressor driving assembly 82, respectively, for driving the well hose to ascend, the reel to wind, the oil pump 81 to work, and the air compressor 83 to work. The oil return pipeline 22 is also connected with the well hose lifting assembly 5, the reel winding assembly 7, the oil pump driving assembly 8, and the air compressor driving assembly 82, respectively, for controlling the well hose to descend, the reel to release, and the oil pump 81 and the air compressor 83 to work.

[0051] As Figure 2As shown, the hydraulic system 2 further comprises an oil tank 61, a booster pump 91, a first check valve 92, a pressure gauge 93 and a relief valve 94, one end of the booster pump 91 is connected to the oil tank 61, the other end is connected to the first check valve 92, the first check valve 92 is connected to the pressure gauge 93, the relief valve 94 is connected between the first check valve 92 and the pressure gauge 93, the relief valve 94 is connected to the oil return pipeline 22, and the oil return pipeline 22 is connected to the oil tank 61. The booster pump 91 serves as the power core, extracts low-pressure hydraulic oil from the oil tank 61 and pressurizes it to convert it into high-pressure hydraulic oil that meets the requirements of platform lifting, cantilever action, ground well hose driving and other components. In the embodiment of the application, the booster pump 91 is a gear pump, and the booster pump 91 obtains power from the power take-off of the chassis of the refueling truck. The first check valve 92 is connected in series between the booster pump 91 and the downstream pipeline, allowing hydraulic oil to flow only from the booster pump 91 to the oil inlet pipeline 21, and preventing oil from flowing back to the booster pump 91 due to pressure fluctuations downstream. It can avoid frequent start and stop of the booster pump 91, pressure drop, ensure continuous and stable pressure of the oil inlet pipeline 21, and further ensure the continuity of the action of each executing component. The relief valve 94 is connected in parallel between the first check valve 92 and the pressure gauge 93, and the other end is connected to the oil return pipeline 22, which sets the highest safety pressure threshold of the system. When the relief valve 94 is automatically opened, the excess high-pressure oil is guided back to the oil tank 61 through the oil return pipeline 22, quickly reducing the pipeline pressure. The pressure gauge 93 is directly connected to the high-pressure pipeline downstream of the first check valve 92, which can display the current working pressure of the system in real time. The operator can intuitively judge whether the system pressure is within the normal range through the pressure gauge 93. If the pressure is abnormal, it can be found in time through the pressure gauge 93 and the system can be shut down for maintenance to prevent small faults from expanding into system damage.

[0052] Please refer to Figure 3 , Figure 3 for Figure 2 the structure of the ground well hose lifting assembly 5 as shown in Figure 3 , the ground well hose lifting assembly 5 comprises: a plurality of ground well hose driving members 51, each ground well hose driving member 51 comprising an upstream check valve 52, a downstream check valve 53, a fourth hydraulic control check valve 54 and a ground well hose oil cylinder 55; the first end of the upstream check valve 52 and the fourth hydraulic control check valve 54 are connected, the second end of the fourth hydraulic control check valve 54 is connected to the ground well hose oil cylinder 55, and the ground well hose oil cylinder 55 is connected to the downstream check valve 53; a fourth directional control valve 56, the inlet of the fourth directional control valve 56 is connected to the oil inlet pipeline 21, the outlet of the fourth directional control valve 56 is connected to the oil return pipeline 22; the second outlet B of the fourth directional control valve 56 is connected to a plurality of upstream check valves 52, and the first outlet A of the fourth directional control valve 56 is connected to the control end of a plurality of fourth hydraulic control check valves 54.

[0053] When the well hose needs to be controlled to descend, the inlet port P of the fourth reversing valve 56 is connected to the second outlet port B, and the hydraulic oil in the inlet oil pipeline 21 flows out from the second outlet port B, enters the first end of the fourth hydraulic control one-way valve 54 through the upstream one-way throttle valve 52 (only throttling in the "inlet direction"), at this time the fourth hydraulic control one-way valve 54 is normally open, and the high-pressure oil enters the well hose oil cylinder 55 to drive the well hose oil cylinder 55 to elongate and drive the hose to descend. The upstream one-way throttle valve 52 can control the inlet flow by adjusting the opening degree of the throttle port, so as to stabilize the hose descending speed within a certain range, adapt to the safe speed of the well docking, and avoid the hose from accelerating to descend due to its own weight, and cause the hose to be damaged or the well valve 73 to be deformed due to the impact of the well interface.

[0054] When the well hose needs to be controlled to ascend, the inlet port P of the fourth reversing valve 56 is connected to the first outlet port A, and the return port T is connected to the second outlet port B. On the one hand, the high-pressure oil flows from the first outlet port A of the fourth reversing valve 56 to the control end of the fourth hydraulic control one-way valve 54 to drive the fourth hydraulic control one-way valve 54 to be reversely open; on the other hand, the high-pressure oil drives the well hose oil cylinder 55 to contract through the downstream one-way throttle valve 53, and the oil in the oil cylinder returns to the return oil pipeline 22 through the second outlet port B, and the well hose oil cylinder 55 contracts to drive the well hose to ascend. The downstream one-way throttle valve 53 can adjust the oil amount from the first outlet port A to the well hose oil cylinder 55, so as to avoid the well hose from ascending too fast due to the excessive thrust of the well hose oil cylinder 55, prevent the well hose from shaking and colliding with the tanker body, cantilever or aircraft body, and at the same time ensure that the ascending speed is stable, so as to facilitate the operator to observe the hose retraction state.

[0055] The fourth hydraulic control one-way valve 54 is connected in series between the upstream one-way throttle valve 52 and the well hose oil cylinder 55, and only allows the high-pressure oil to flow from the upstream throttle valve to the oil cylinder in the normal direction. When the hose descends to the target position and the fourth reversing valve 56 stops oil supply, the hydraulic control one-way valve 9264 will be automatically closed, and the oil pressure in the oil cylinder is locked. Even if the hose has a tendency to descend due to its own weight, it cannot push the oil to flow back in the reverse direction, so as to ensure that the hose is stable in the hovering position, and there is no need to continuously supply oil to maintain the pressure, which not only reduces the energy consumption, but also avoids the failure of the well docking due to the slow descent in the hovering state.

[0056] In the embodiment of the present application, the number of well hose driving members 51 is 4, which can simultaneously drive four well hoses to ascend and descend. In some other embodiments, the number of well hose driving members 51 can also be other values, which are not limited in the present application.

[0057] Please also refer to Figure 2 and Figure 3The hydraulic system 2 further comprises an oil tank 61, a manual booster 62, a three-way valve 63, and two check valves. One end of the manual booster 62 is connected to the oil tank 61, and the other end of the manual booster 62 is connected to the input end of the three-way valve 63. One of the output ends of the three-way valve 63 is connected to the plurality of upstream check throttle valves 52 through one of the check valves, and the other output end of the three-way valve 63 is connected to the platform drive through the other check valve.

[0058] When the main hydraulic system 2 (such as the booster pump 91 fails or the oil inlet pipeline 21 leaks) suddenly fails during the operation of the aircraft refueling vehicle on the apron, the ground well hose cannot be lifted, and the platform cannot be driven, directly interrupting the refueling task and possibly affecting flight scheduling. The design of the manual booster 62 and related components can form an emergency power source.

[0059] When the ground well hose and the platform cannot be actuated due to failure of the main hydraulic system 2, the operator can extract hydraulic oil from the oil tank 61 and pressurize it through the manual booster 62, switch to the ground well hose path or the platform path or open both paths through the three-way valve 63, and then deliver high-pressure oil to the plurality of upstream check throttle valves 52 or to the platform through the corresponding check valves (to prevent oil backflow), thereby controlling the platform to rise and the ground well hose to lower, and thus enabling the refueling operation to be started. Avoid the impact of the failure of the electric booster pump 91 on the refueling work.

[0060] Please refer to Figure 4 , Figure 4 for Figure 2 the structure diagram of the turntable winding assembly 7 in the hydraulic system 2. In the embodiment shown in Figure 4 , the turntable winding assembly 7 comprises: a winding motor 71; a fifth directional valve 72, an oil inlet P of the fifth directional valve 72 is connected to the oil inlet pipeline 21, an oil outlet of the fifth directional valve 72 is connected to the oil return pipeline 22; a second oil outlet B of the fifth directional valve 72 is connected to a first end of the winding motor 71, and a first oil outlet A of the fifth directional valve 72 is connected to a second end of the winding motor 71; when the fifth directional valve 72 is in a first state, the oil inlet P and the second oil outlet B of the fifth directional valve 72 are connected, and the oil return port T and the first oil outlet A of the fifth directional valve 72 are connected; when the fifth directional valve 72 is in a second state, the oil inlet P, the first oil outlet A, and the second oil outlet B of the fifth directional valve 72 are connected.

[0061] When the fifth directional valve 72 is in the first state, its internal oil circuit connects "oil inlet P - second oil outlet B" and "oil return port T - first oil outlet A". High-pressure oil flows from the oil inlet pipe 21 into the oil inlet P of the fifth directional valve 72, and is delivered to the first end of the winding motor 71 through the second oil outlet B, driving the winding motor 71 to rotate in the forward direction. At the same time, the return oil from the second end of the winding motor 71 flows into the return oil pipe 22 through the first oil outlet A and the return oil outlet T, forming a complete oil circuit circulation. In this state, the winding motor 71 can stably output torque to drive the turntable to wind up the hose at a uniform speed. After operation, the scattered hose can be retrieved to the turntable to avoid hose dragging and wear.

[0062] When the fifth directional valve 72 is in the second state, its internal oil circuit is connected to "oil inlet P - first oil outlet A - second oil outlet B", and the return oil port T remains open. High-pressure oil flows into both the first and second ends of the winding motor 71 simultaneously. The winding motor 71 is balanced at both ends and cannot generate effective torque, thus achieving an emergency stop of the winding motor 71. Excess oil in the winding motor 71 can flow back to the oil tank 61 through the return oil port T, preventing a sudden increase in pressure inside the motor from damaging the seals, achieving unloading protection, and extending the motor's service life. The operator can manually release the oil hose by pulling it. Compared to the electric release method, the manual release method avoids the problem of the oil hose becoming tangled due to excessive release.

[0063] exist Figure 4 In the embodiment shown, a valve 73 and a second one-way throttle valve assembly 74 are also provided between the second end of the winding motor 71 and the second oil outlet B of the fifth reversing valve 72, which are connected in sequence. The second one-way throttle valve assembly 74 includes two one-way throttle valves connected to each other in opposite directions.

[0064] Thus, by setting valve 73, when the fifth reversing valve 72 is in the first state controlling the winding motor 71 to rotate and wind the oiling hose, the winding motor 71 can be stopped from winding the oiling hose. If an obstacle is needed during the winding process, valve 73 can be controlled to cut off the passage between the second end of the winding motor 71 and the first oil outlet A, so that the winding motor 71 stops rotating. After the obstacle is cleared, valve 73 can be opened to connect the passage between the second end of the winding motor 71 and the first oil outlet A, so that the winding motor 71 continues to rotate and wind the oiling hose.

[0065] By setting a second one-way throttle valve assembly 74, which includes two one-way throttle valves connected to each other in opposite directions, the rotation speed of the winding motor 71 can be controlled, thereby controlling the winding speed of the reel.

[0066] Please refer to Figure 2 ,exist Figure 2In the embodiment shown, the hydraulic system 2 further comprises an oil pump driving assembly 8, the oil pump driving assembly 8 comprising an oil pump 81, a first end of the oil pump 81 being connected with the third oil outlet of the first reversing valve 31, a second end of the oil pump 81 being connected with the oil return pipeline 22, and the first reversing valve 31 being in the third state to connect the oil inlet P and the third oil outlet of the first reversing valve 31.

[0067] When the first reversing valve 31 is in the third state to connect the oil inlet P and the third oil outlet of the first reversing valve 31, the hydraulic oil in the oil inlet pipeline enters the first end of the oil pump 81 to drive the oil pump 81 to rotate in the forward direction; at the same time, the oil return at the second end of the oil pump 81 enters the oil return pipeline 22 to form a complete oil circuit.

[0068] In the present patent application, the first oil outlet A of the first reversing valve 31 is connected with the platform lifting assembly 3 and the cantilever lifting assembly 4, and the third oil outlet of the first reversing valve 31 is connected with the oil pump driving assembly 8, so that when the reversing valve is in the first state, the platform and the cantilever are controlled to rise, when the first reversing valve 31 is in the second state, the platform and the cantilever are controlled to descend, and when the first reversing valve 31 is in the third state, the oil pump 81 is controlled to work, which meets the working condition that the oil pump 81 does not work when the platform and the cantilever are lifted, and the oil pump 81 starts to work only when the platform and the cantilever are lifted to the position during use of the refueling vehicle.

[0069] Please refer to Figure 2 , the hydraulic system 2 further comprises an air compressor driving assembly 82, the air compressor driving assembly 82 comprising an air compressor 83 and a sixth reversing valve 84, the oil inlet P of the sixth reversing valve being connected with the third oil outlet of the first reversing valve 31, the first oil outlet A of the sixth reversing valve 84 being connected with the first end of the oil pump 81, the second oil outlet B of the sixth reversing valve 84 being connected with the first end of the air compressor 83, and the second end of the air compressor 83 being connected with the oil return pipeline 22; when the sixth reversing valve 84 is in the first state, the oil inlet P and the first oil outlet A of the sixth reversing valve 84 are connected; and when the sixth reversing valve 84 is in the second state, the oil inlet P and the second oil outlet B of the sixth reversing valve 84 are connected.

[0070] When the first reversing valve 31 is in the third state to connect the oil inlet P and the third oil outlet, and the sixth reversing valve 84 is switched to the second state to connect the oil inlet P and the second oil outlet B, the high-pressure hydraulic oil is directionally delivered from the oil inlet pipeline 21 to the first end of the air compressor 83 through the third oil outlet of the first reversing valve 31 and the second oil outlet B of the sixth reversing valve 84 to drive the rotor of the air compressor 83 to rotate at a high speed to generate a stable high-pressure air source. When the air compressor 83 is running, the hydraulic oil driving the air compressor 83 to work flows into the oil return pipeline 22 from the second end after completing power output, and finally returns to the oil tank 61 to avoid pressure build-up of the oil in the air compressor 83.

[0071] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0072] It is to be understood that the application is not limited to the precise construction herein described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be indicated by the appended claims, rather than the description.

Claims

1. A hydraulic system for an aircraft fueler, comprising: The hydraulic system comprises: an oil inlet pipeline, an oil return pipeline and a platform lifting assembly, wherein the platform lifting assembly comprises: a first reversing valve, an oil inlet of the first reversing valve being connected with the oil inlet pipeline, an oil return of the first reversing valve being connected with the oil return pipeline; a first hydraulic control check valve, a first end of the first hydraulic control check valve being connected with a first oil outlet of the first reversing valve, a second end of the first hydraulic control check valve being connected with a platform drive, a control end of the first hydraulic control check valve being connected with a second oil outlet of the first reversing valve; a first damping valve, one end of the first damping valve being connected with a connection between the control end of the first hydraulic control check valve and the second oil outlet of the first reversing valve, the other end of the first damping valve being connected with the oil return pipeline; when the first reversing valve is in a first state, the oil inlet and the first oil outlet are connected, and the hydraulic oil drives the platform to rise through the first hydraulic control check valve; when the first reversing valve is in a second state, the oil inlet and the second oil outlet are connected, the oil return and the first oil outlet are connected, the first hydraulic control check valve is reversely conducted, the hydraulic oil between the first hydraulic control check valve and the platform returns to the oil return pipeline through the first hydraulic control check valve, the first oil outlet and the oil return, and the first damping valve is used for reducing the change speed of the pressure of the control end of the first hydraulic control check valve when the pressure of the hydraulic oil of the second oil outlet changes.

2. The hydraulic system of the aircraft fueler of claim 1, wherein, The first hydraulic control check valve and the platform are further provided with a second reversing valve and a first one-way throttling valve assembly, the first one-way throttling valve assembly comprises two one-way throttling valves which are opposite to each other, an oil inlet of the second reversing valve is connected with a second end of the first hydraulic control check valve, a first oil outlet of the second reversing valve is connected with the platform, a second oil outlet of the second reversing valve is connected with one of the one-way throttling valves, and the other one-way throttling valve is connected with the platform.

3. The hydraulic system of the aircraft fueler of claim 1, wherein, The first hydraulic control check valve and the platform are further provided with a platform drive, the platform drive comprises a first motor, a second motor, a first oil cylinder and a second oil cylinder, the first motor and the first oil cylinder are drivingly connected, the second motor and the second oil cylinder are drivingly connected, and the first motor and the second motor are synchronous motors.

4. The hydraulic system of the aircraft fueler truck of claim 1, wherein, The hydraulic system further comprises a cantilever lifting assembly, the cantilever lifting assembly comprises: a pressure reducing valve, a first end of the pressure reducing valve being connected with the first oil outlet of the first reversing valve; a second hydraulic control check valve, a first end of the second hydraulic control check valve being connected with a second end of the pressure reducing valve, a second end of the second hydraulic control check valve being connected with a cantilever, a control end of the second hydraulic control check valve being connected with the second oil outlet of the first reversing valve; a third hydraulic control check valve, a first end of the third hydraulic control check valve being connected with the oil return pipeline, a second end of the third hydraulic control check valve being connected with the first end of the first hydraulic control check valve, a control end of the third hydraulic control check valve being connected with the second oil outlet of the first reversing valve; A second damping valve, one end of the second damping valve is connected with the connection between the control end of the second hydraulic control check valve, the control end of the third hydraulic control check valve and the second oil outlet of the first reversing valve, the other end of the second damping valve is connected with the oil return pipeline.

5. The hydraulic system of the aircraft fueler of claim 4, wherein, The cantilever lifting assembly further comprises a third reversing valve, one end of the third reversing valve is connected with the first damping valve, the oil return port of the third reversing valve is connected with the oil return pipeline, and the first oil outlet of the third reversing valve is connected with the connection between the control end of the second hydraulic control check valve, the control end of the third hydraulic control check valve and one end of the second damping valve; when the third reversing valve is in the first state, the oil inlet and the first oil outlet of the third reversing valve are connected to connect the second oil outlet of the first reversing valve and the control end of the second hydraulic control check valve and the control end of the third hydraulic control check valve; when the third reversing valve is in the second state, the first oil outlet and the oil return port of the third reversing valve are connected to connect the oil return pipeline and the control end of the second hydraulic control check valve and the control end of the third hydraulic control check valve.

6. The hydraulic system of the aircraft fueler of claim 4, wherein, A first manual valve is further arranged between the second end of the first hydraulic control check valve and the oil return pipeline; and / or A second manual valve is further arranged between the second end of the second hydraulic control check valve and the oil return pipeline.

7. The hydraulic system of the aircraft fueler of claim 1, wherein, The hydraulic system further comprises a well hose lifting assembly, the well hose lifting assembly comprising: A plurality of well hose driving members, each well hose driving member comprising an upstream check valve, a downstream check valve, a fourth hydraulic control check valve and a well hose oil cylinder; the upstream check valve is connected with the first end of the fourth hydraulic control check valve, the second end of the fourth hydraulic control check valve is connected with the well hose oil cylinder, and the well hose oil cylinder is connected with the downstream check valve; A fourth reversing valve, the oil inlet of the fourth reversing valve is connected with the oil inlet pipeline, and the oil outlet of the fourth reversing valve is connected with the oil return pipeline; the second oil outlet of the fourth reversing valve is respectively connected with the plurality of upstream check valves, and the first oil outlet of the fourth reversing valve is respectively connected with the control end of the plurality of fourth hydraulic control check valves.

8. The hydraulic system of the aircraft fueler cart of claim 7, wherein, The hydraulic system further comprises an oil tank, a manual booster, a three-way valve and two check valves, one end of the manual booster is connected with the oil tank, the other end of the manual booster is connected with the input end of the three-way valve, one of the output ends of the three-way valve is respectively connected with the plurality of upstream check valves through one of the check valves, and the other output end of the three-way valve is connected with the platform driving through the other check valve.

9. The hydraulic system of the aircraft fueler of claim 1, wherein, The hydraulic system further comprises a rotary table winding assembly, the rotary table winding assembly comprising: A winding motor; A fifth reversing valve, an oil inlet of the fifth reversing valve is connected with the oil inlet pipeline, an oil outlet of the fifth reversing valve is connected with the oil return pipeline; a second oil outlet of the fifth reversing valve is connected with the first end of the winding motor, a first oil outlet of the fifth reversing valve is connected with the second end of the winding motor; when the fifth reversing valve is in a first state, the oil inlet and the second oil outlet of the fifth reversing valve are connected, and the oil return outlet of the fifth reversing valve and the first oil outlet are connected; when the fifth reversing valve is in a second state, the oil inlet, the first oil outlet and the second oil outlet of the fifth reversing valve are connected.

10. The hydraulic system of the aircraft fueler truck of claim 9, wherein, A valve and a second one-way throttle valve assembly connected in sequence are further arranged between the second end of the winding motor and the second oil outlet of the fifth reversing valve, and the second one-way throttle valve assembly comprises two reverse one-way throttle valves connected with each other.

11. The hydraulic system of the aircraft fueler truck of claim 1, wherein, The hydraulic system further comprises an oil pump driving assembly, the oil pump driving assembly comprises an oil pump, a first end of the oil pump is connected with the third oil outlet of the first reversing valve, and a second end of the oil pump is connected with the oil return pipeline; when the first reversing valve is in a third state, the oil inlet and the third oil outlet of the first reversing valve are connected.

12. The hydraulic system of the aircraft fueler cart of claim 11, wherein, The hydraulic system further comprises an air compressor driving assembly, the air compressor driving assembly comprises an air compressor and a sixth reversing valve, an oil inlet of the sixth reversing valve is connected with the third oil outlet of the first reversing valve, a first oil outlet of the sixth reversing valve is connected with the first end of the oil pump, a second oil outlet of the sixth reversing valve is connected with the first end of the air compressor, and a second end of the air compressor is connected with the oil return pipeline; when the sixth reversing valve is in a first state, the oil inlet and the first oil outlet of the sixth reversing valve are connected, and when the sixth reversing valve is in a second state, the oil inlet and the second oil outlet of the sixth reversing valve are connected.

13. The hydraulic system of the aircraft fueler cart of claim 1, wherein, The hydraulic system further comprises an oil tank, a booster pump, a first one-way valve, a pressure gauge and a relief valve, one end of the booster pump is connected with the oil tank, the other end of the booster pump is connected with the first one-way valve, the first one-way valve is connected with the pressure gauge, the relief valve is connected between the first one-way valve and the pressure gauge, the relief valve is connected with the oil return pipeline, and the oil return pipeline is connected with the oil tank.

14. An aircraft fueler truck characterized by, The hydraulic system of the aircraft refueling vehicle comprises the aircraft refueling vehicle.

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