Joint moving lift truck for ground well refueling

By designing a joint mobile lift truck for ground well refueling, the problem of inconvenient disassembly of flow standard devices is solved, rapid docking and verification are achieved, and efficient demand for civil aviation flow metering is met.

CN223175752UActive Publication Date: 2025-08-01中国航空油料有限责任公司
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Patent Information

Application Number
CN202422524357.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-18
Publication Date
2025-08-01
Estimated Expiration
2034-10-18

AI Technical Summary

Technical Problem

The existing civil aviation connection ground well joints are usually installed on refueling vehicles, and the lack of convenient methods for independent storage and use, which makes it time-consuming and labor-intensive to disassemble the flow standard device and is difficult to meet the current verification needs.

Method used

A joint mobile lift truck for refueling of ground wells is designed. The rapid lifting and movement of the docking device is achieved through the lifting device and the moving device. Combined with the universal wheel and chain drive, it is convenient to quickly connect with the ground well valve and pipeline, and form a closed pipeline to realize the verification of the flow standard device.

Benefits of technology

It realizes rapid docking and verification of flow standard devices, the device has a small structure and simple operation, and meets the current efficient verification needs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a joint moving lift truck for ground well refueling, which comprises a lifting device, a butt joint device and a moving device, a lifting part of the lifting device is arranged on the moving device, a connecting pipeline of the butt joint device is arranged on a lifting platform of the lifting device, and the lifting platform is arranged on the lifting part in an up-down moving mode. And two pipes on the lifting platform are connected to the flow standard device. Through the device, the volume pipe, the experimental pipeline and the flow standard device are connected to form a closed pipeline, so that the calibration function of the volume pipe to the flow standard device is realized. The problems that an existing ground well connecting connector used for civil aviation is usually installed on a refueling truck to form a whole set, a convenient method for independent storage and use is lacked, particularly, temporary disassembly and assembly of a standard device are very inconvenient during metrological verification, disassembly of a flow standard device is time-consuming and labor-consuming, the flow standard device is not suitable for the current use state, and the use cost is high are solved. And the current working requirements are not met.
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Description

Technical Field

[0001] The utility model relates to the technical field of civil aviation ground well refueling verification and metering, and particularly relates to a joint mobile lifting vehicle for ground well refueling. Background Technique

[0002] With the rapid development of China's civil aviation industry, faster, more accurate and more stable requirements have been put forward for relevant verification of aircraft refueling flow meters, standard liquid volumetric flow meters and standard flow devices. While the civil aviation is developing rapidly, the detection accuracy requirements for flow and flow meters are getting higher and higher, especially for aviation fuel measurement units. To ensure the accurate metering of the flow meter, its metering performance must be tested or calibrated before leaving the factory, during use, and after maintenance. For flow calibration of the flow meter, a flow metering verification device stipulated by the state should be used to verify and calibrate the characteristics and accuracy of the flow meter.

[0003] For on-line verification of the flow meter, it is required to use an on-line metering verification system and method for verification of the aviation fuel flow meter, and a standard volume tube standard device is used to verify the standard flow meter. The verification process requires the standard flow meter to be dynamically verified under the use state without disassembly and production stop, and the verification process is required to be carried out under the condition that the standard flow meter is continuously working.

[0004] The connection ground well joints used in China's civil aviation are usually installed on refueling vehicles as a complete set, lacking a convenient method for independent storage and use. Especially, it is very inconvenient to temporarily disassemble and assemble the standard device during metering verification. The disassembly of the flow standard device is time-consuming and laborious, and it is no longer suitable for the current use state and does not meet the current work requirements. Content of the Utility Model

[0005] The utility model provides a joint mobile lifting vehicle for ground well refueling. Through this device, the volume tube, the experimental pipeline and the flow standard device are connected to form a closed pipeline, so as to realize the verification function of the volume tube for the flow standard device. It solves the problem that the connection ground well joints used in existing civil aviation are usually installed on refueling vehicles as a complete set, lacking a convenient method for independent storage and use. Especially, it is very inconvenient to temporarily disassemble and assemble the standard device during metering verification. It solves the problems that the disassembly of the flow standard device is time-consuming and laborious, and it is no longer suitable for the current use state and does not meet the current work requirements.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The lifting part of the lifting device is arranged on the moving device, the connecting pipeline of the docking device is arranged on the lifting platform of the lifting device, and the lifting platform moves up and down on the lifting part.

[0008] The beneficial effects of the present utility model are as follows: By lifting the lifting device, the docking device can be lifted, and through the moving device, the docking device and the lifting device can be quickly moved to the calibration site to achieve rapid docking with the on-site ground well valve and pipeline. The structure of this device is small and compact, easy to move, simple to operate, capable of lifting and adjusting, can quickly dock pipelines, and has good practical performance.

[0009] Based on the above technical solution, the present utility model can be further improved as follows.

[0010] Further, the moving device includes a support frame, a support plate, and sliding members. The support frame is disposed on the support plate, and there are multiple sliding members, which are respectively disposed at multiple positions at the bottom of the support plate or at the four corners of the bottom of the support frame.

[0011] The beneficial effect of adopting the above further solution is that by setting the sliding members at the bottom of the support plate, the sliding members can drive the support frame to move together, so that the support frame can drive the lifting device and the docking device to move together.

[0012] Further, the sliding members are universal wheels.

[0013] The beneficial effect of adopting the above further solution is that the sliding members are universal wheels, making the moving device more convenient and fast when moving.

[0014] Further, the lifting device includes a lifting part, a driving device, a chain, and a lifting platform. The bottom of the lifting part is disposed on the support frame, the driving device is disposed on the lifting part, and the output end of the driving device abuts against the top of the lifting part. A pulley is provided at the top of the lifting part, the chain is arranged on the pulley, one end of the chain is fixedly connected to the lifting platform, the other end of the chain is fixedly connected to the support frame, and both sides of the lifting platform slide up and down on the support frame.

[0015] The beneficial effect of adopting the above further solution is that by driving the driving device, the output end of the driving device acts on the lifting part, so that the lifting part rises and falls with the lifting and lowering of the driving device. At the same time, during the lifting and lowering process of the lifting part, the chain arranged on the pulley of the lifting part moves up and down. Since the length of the chain is fixed and one end of the chain is fixedly connected to the support frame, the other end of the chain drives the lifting platform to rise and fall with the lifting and lowering of the lifting part.

[0016] Further, both sides of the lifting platform have first protrusions, and the first protrusions on both sides slide on the support frame. The second protrusion of the lifting platform is fixedly connected to one end of the chain, and the lifting platform is also provided with a groove, and a part of the docking device is clamped in the groove.

[0017] The beneficial effects of adopting the above further solution are as follows: The second protrusion is fixedly connected to one end of the chain, and the first protrusion is slidably arranged on the support frame. When the first protrusion slides up and down on the support frame, the entire lifting platform slides up and down along the support frame, thereby driving the docking device to move up and down together, enabling the docking device to adjust the lifting height as needed.

[0018] Furthermore, the lifting device further includes a pedal and an exhaust valve, and both the pedal and the exhaust valve act on the driving device.

[0019] The beneficial effects of adopting the above further solution are as follows: By the pedal and the exhaust valve acting on the driving device, the driving device can be driven to rise and depressurize and descend. The lifting and lowering of the driving device drive the movement of the chain, thereby driving the lifting platform and the docking device on the lifting platform to perform lifting movements.

[0020] Furthermore, the pedal is arranged at the pressurizing part of the driving device, and the exhaust valve is arranged at the pressure-relieving part of the driving device.

[0021] The beneficial effects of adopting the above further solution are as follows: The pedal is arranged at the pressurizing part of the driving device. Stepping on the pedal causes the output end of the driving device to output upward, causing the lifting part to rise simultaneously. The exhaust valve is arranged at the pressure-relieving part of the driving device. Opening the exhaust valve causes the output end of the driving device to contract downward, causing the lifting part to contract downward simultaneously.

[0022] Furthermore, the docking device includes a wellhead valve joint, a docking flange, a connecting pipe, and a hose docking quick connector. One port of the wellhead valve joint is connected to the wellhead, and the other port of the wellhead valve joint is connected to one port of the connecting pipe through the docking flange. The other port of the connecting pipe is provided with a hose docking quick connector, and the connecting pipe is clamped in the groove.

[0023] The beneficial effects of adopting the above further solution are as follows: Through the corresponding pipeline hose of the connecting pipe, the petroleum in the pipeline hose is transported into the well. The docking flange can control the wellhead valve joint, enabling adjustment of the refueling volume as needed when refueling the well.

[0024] Furthermore, the connecting pipe is a three-way pipe. The main pipe of the connecting pipe is connected to the wellhead valve joint, and hose docking quick connectors are respectively arranged at the ports of the two branch pipes of the connecting pipe.

[0025] The beneficial effects of adopting the above further solution are as follows: Setting the connecting pipe as a three-way pipe enables the petroleum in the oil tank to enter the well through the two branch pipes of the connecting pipe after passing through the volume tube and the standard device, and then, it flows back to the oil tank through the well. By this device, the volume tube, the experimental pipeline, and the flow standard device are connected to form a closed pipeline, thereby realizing the verification function of the volume tube for the flow standard device.

[0026] Furthermore, the tee joint of the connecting pipe is clamped in the groove, and the other two branch pipes are arranged on the lifting platform. The two branch pipes of the connecting pipe arranged on the lifting platform (14) are connected to the flow standard device.

[0027] The beneficial effect of adopting the above further solution is that the tee joint of the connecting pipe is clamped in the groove, and the other two branch pipes are arranged on the lifting platform, so that the height of the lifting platform can be adjusted according to needs, which is convenient to connect the pipe to the flow standard device. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of a joint mobile lifting vehicle for underground well refueling according to the present utility model;

[0029] Figure 2 It is a schematic side structural diagram of a joint mobile lifting vehicle for underground well refueling according to the present utility model;

[0030] Figure 3 It is a top view of a joint mobile lifting vehicle for underground well refueling according to the present utility model;

[0031] Figure 4 It is another schematic side structural diagram of a joint mobile lifting vehicle for underground well refueling according to the present utility model.

[0032] In the drawings, the list of components represented by each reference numeral is as follows: 1 - lifting device; 11 - lifting part; 12 - driving device; 13 - chain; 14 - lifting platform; 141 - first protrusion; 142 - second protrusion; 143 - groove; 15 - pedal; 16 - exhaust valve; 2 - docking device; 21 - underground well valve joint; 22 - docking flange; 23 - connecting pipe; 24 - hose docking quick joint; 3 - moving device; 31 - support frame; 32 - support plate; 33 - sliding member. Detailed Embodiment

[0033] The principles and features of the present utility model are described below with reference to the drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0034] Embodiment 1

[0035] As Figures 1-4 shown, the lifting part 11 of the lifting device 1 is arranged on the moving device 3, the connecting pipe 23 of the docking device 2 is arranged on the lifting platform 14 of the lifting device 1, and the lifting platform 14 is arranged to move up and down on the lifting part 11.

[0036] Specifically, by lifting the lifting device 1, the docking device 2 is lifted, and the docking device 2 and the lifting device 1 are quickly moved to the verification site through the moving device 3, realizing the quick docking with the on-site ground well valve and pipeline.

[0037] As Figures 1-4 shown, the moving device 3 includes a support frame 31, a support plate 32 and sliding members 33. The support frame 31 is arranged on the support plate 32. There are multiple sliding members 33, and the multiple sliding members 33 are respectively arranged at multiple positions at the bottom of the support plate 32 or at the four corners of the bottom of the support frame 31.

[0038] Specifically, the sliding members 33 can drive the lifting device 1 and the docking device 2 to quickly move to the verification site together.

[0039] As Figures 1-4 shown, the sliding members 33 are universal wheels.

[0040] Specifically, the sliding members 33 are universal wheels, making the moving device 3 more convenient and fast when moving.

[0041] As Figures 1-4 shown, the lifting device 1 includes a lifting part 11, a driving device 12, a chain 13 and a lifting platform 14. The bottom of the lifting part 11 is arranged on the support frame 31. The driving device 12 is arranged on the lifting part 11, and the output end of the driving device 12 abuts against the top of the lifting part 11. A pulley is arranged at the top of the lifting part 11. The chain 13 is arranged on the pulley. One end of the chain 13 is fixedly connected to the lifting platform 14, and the other end of the chain 13 is fixedly connected to the support frame 31. Both sides of the lifting platform 14 are slidably arranged up and down on the support frame 31.

[0042] Specifically, when the driving device 12 is driven, the output end of the driving device 12 acts on the lifting part 11. When the output end of the driving device 12 drives the lifting part 11 to rise, the chain 13 will slide as the lifting part 11 rises. When the chain 13 moves upward, it will drive the lifting platform 14 fixedly connected to the chain 13 to move upward together. When the output end of the driving device 12 drives the lifting part 11 to descend, the chain 13 will slide as the lifting part 11 descends. When the chain 13 moves downward, it will drive the lifting platform 14 fixedly connected to the chain 13 to move downward together. The operator can adjust the height of the docking device 2 through the lifting device 1 according to the height of the fuel filling well to be verified, so as to quickly connect the pipeline hose. In this embodiment, the driving device 12 is a hydraulic cylinder. Alternatively, the driving device 12 can also be a telescopic rod, or other devices with a lifting function.

[0043] As Figures 1-4As shown in the figure, both sides of the lifting platform 14 have first protrusions 141, and the first protrusions 141 on both sides are slidably arranged on the support frame 31. The second protrusion 142 of the lifting platform 14 is fixedly connected to one end of the chain 13. The lifting platform 14 is also provided with a groove 143, and a part of the docking device 2 is clamped in the groove 143.

[0044] Specifically, when the lifting part 11 moves upward or downward, the first protrusions 141 on both sides of the lifting platform 14 slide upward or downward along the height direction of the support frame 31. When the lifting platform 14 moves upward or downward, the docking device 2 arranged on the lifting platform 14 is driven to move upward or downward at the same time.

[0045] As Figures 1-4 shown in the figure, the lifting device 1 further includes a pedal 15 and an exhaust valve 16, and both the pedal 15 and the exhaust valve 16 act on the driving device 12.

[0046] Specifically, by acting on the driving device 12 through the pedal 15 and the exhaust valve 16, the driving device 12 can drive upward and depressurize and descend. The lifting and lowering of the driving device 12 drive the movement of the chain 13, thereby driving the lifting platform 14 and the docking device 2 on the lifting platform 14 to perform lifting and lowering movements.

[0047] As Figures 1-4 shown in the figure, the pedal 15 is arranged on the pressurizing part of the driving device 12, and the exhaust valve 16 is arranged on the pressure relief part of the driving device 12.

[0048] Specifically, the pedal 15 is arranged on the pressurizing part of the driving device 12. Stepping on the pedal 15 makes the output end of the driving device 12 output upward, so that the lifting part 11 rises upward at the same time. At the same time, the docking device 2 on the lifting platform 14 moves upward.

[0049] The exhaust valve 16 is arranged on the pressure relief part of the driving device 12. Opening the exhaust valve 16 makes the output end of the driving device 12 contract downward, so that the lifting part 11 contracts downward at the same time. At the same time, the docking device 2 on the lifting platform 14 moves downward.

[0050] As Figures 1-4 shown in the figure, the docking device 2 includes a well valve joint 21, a docking flange 22, a connecting pipe 23 and a hose docking quick connector 24. One port of the well valve joint 21 is connected to the wellhead, and the other port of the well valve joint 21 is connected to one port of the connecting pipe 23 through the docking flange 22. The other port of the connecting pipe 23 is provided with a hose docking quick connector 24, and the connecting pipe 23 is clamped in the groove 143.

[0051] Specifically, connect the ground well valve joint 21 to the ground well, connect the connecting pipe 23 to the pipeline hose through the hose docking quick joint 24, and let the petroleum in the pipeline enter the ground well through the connecting pipe 23.

[0052] As Figures 1-4 shown, the connecting pipe 23 is a tee pipe. The main pipe of the connecting pipe 23 is connected to the ground well valve joint 21, and hose docking quick joints 24 are respectively arranged at the ports of the other two branch pipes of the connecting pipe 23.

[0053] Specifically, set the connecting pipe 23 as a tee pipe. Set the connecting pipe 23 as a tee pipe so that the petroleum in the oil tank passes through the volume tube and the standard device and then enters the ground well through the two branch pipes of the connecting pipe 23. Then, it flows back to the oil tank through the ground well. Connect the volume tube, the experimental pipeline and the flow standard device through this device to form a closed pipeline, so as to realize the verification function of the volume tube for the flow standard device.

[0054] As Figures 1-4 shown, the tee of the connecting pipe 23 is clamped in the groove 143, and the other two branch pipes are arranged on the lifting platform 14. The two branch pipes of the connecting pipe 23 arranged on the lifting platform 14 are connected to the flow standard device.

[0055] Specifically, clamp the tee of the connecting pipe 23 in the groove 143, and arrange the other two branch pipes on the lifting platform 14, so that the connecting pipe 23 can adjust the lifting height of the lifting platform 14 as needed, which is convenient to connect the pipeline to the flow standard device.

[0056] The beneficial effect of this embodiment is: by lifting the lifting device 1, the docking device 2 is lifted, and the docking device 2 and the lifting device 1 are quickly moved to the verification site through the moving device 3 to realize the quick docking with the ground well valve and the pipeline on site. The structure of this device is small and compact, easy to move, simple to operate, can be lifted and adjusted, can quickly dock the pipeline, and has good practical performance.

[0057] The working process of this embodiment is as follows: according to the height of the ground well at the verification site, drive the driving device 12 to perform lifting motion. When the output end of the driving device 12 drives the lifting part 11 to rise, the chain 13 will slide along with the rise of the lifting part 11. When the chain 13 moves upward, it will drive the lifting platform 14 fixedly connected to the chain 13 to move upward together. When the output end of the driving device 12 drives the lifting part 11 to descend, the chain 13 will slide along with the descent of the lifting part 11. When the chain 13 moves downward, it will drive the lifting platform 14 fixedly connected to the chain 13 to move downward together. The operator can adjust the height of the docking device 2 through the lifting device 1 according to the height of the refueling well to be verified, so as to quickly connect the pipeline hose.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0060] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0062] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A joint mobile lifting vehicle for underground well refueling, characterized in that, It includes a lifting device (1), a docking device (2) and a moving device (3). The lifting part (11) of the lifting device (1) is arranged on the moving device (3). The connecting pipe (23) of the docking device (2) is arranged on the lifting platform (14) of the lifting device (1). The lifting platform (14) is arranged to move up and down on the lifting part (11).

2. The joint mobile lifting vehicle for underground well refueling according to claim 1, characterized in that, The moving device (3) includes a support frame (31), a support plate (32) and sliding members (33). The support frame (31) is arranged on the support plate (32). There are multiple sliding members (33), and the multiple sliding members (33) are respectively arranged at multiple positions at the bottom of the support plate (32) or at the four corners of the bottom of the support frame (31).

3. A joint mobile lifting vehicle for underground well refueling according to claim 2, characterized in that, The sliding member (33) is a universal wheel.

4. The joint mobile lifting vehicle for underground well refueling according to claim 1, characterized in that, The lifting device (1) includes a lifting part (11), a driving device (12), a chain (13) and a lifting platform (14). The bottom of the lifting part (11) is arranged on the support frame (31). The driving device (12) is arranged on the lifting part (11), and the output end of the driving device (12) abuts against the top of the lifting part (11). A pulley is arranged at the top of the lifting part (11). The chain (13) is arranged on the pulley. One end of the chain (13) is fixedly connected to the lifting platform (14), and the other end of the chain (13) is fixedly connected to the support frame (31). The two sides of the lifting platform (14) are arranged to slide up and down on the support frame (31).

5. A joint mobile lifting vehicle for underground well refueling according to claim 4, characterized in that, Both sides of the lifting platform (14) have first protrusions (141), and the first protrusions (141) on both sides are slidably arranged on the support frame (31). The second protrusion (142) of the lifting platform (14) is fixedly connected to one end of the chain (13). The lifting platform (14) is also provided with a groove (143), and a part of the docking device (2) is clamped in the groove (143).

6. A joint mobile lifting vehicle for underground well refueling according to claim 4, characterized in that, The lifting device (1) further includes a pedal (15) and an exhaust valve (16), and both the pedal (15) and the exhaust valve (16) act on the driving device (12).

7. The joint mobile lifting vehicle for underground well refueling according to claim 6, characterized in that, The pedal (15) is arranged at the pressurizing part of the driving device (12), and the exhaust valve (16) is arranged at the pressure relief part of the driving device (12).

8. A joint mobile lifting vehicle for underground well refueling according to claim 1, characterized in that, The docking device (2) includes a wellhead valve joint (21), a docking flange (22), a connecting pipe (23) and a hose docking quick connector (24). One port of the wellhead valve joint (21) is connected to the wellhead, and the other port of the wellhead valve joint (21) is connected to one port of the connecting pipe (23) through the docking flange (22). The other port of the connecting pipe (23) is provided with the hose docking quick connector (24), and the connecting pipe (23) is clamped in the groove (143).

9. A joint mobile lifting vehicle for underground well refueling according to claim 8, characterized in that, The connecting pipe (23) is a tee pipe. The main pipe of the connecting pipe (23) is connected to the ground well valve joint (21), and hose docking quick connectors (24) are respectively arranged at the ports of the other two branch pipes of the connecting pipe (23).

10. A joint mobile lifting vehicle for underground well refueling according to claim 9, characterized in that, The tee of the connecting pipe (23) is clamped in the groove (143), and the other two branch pipes are arranged on the lifting platform (14). The two branch pipes of the connecting pipe (23) arranged on the lifting platform (14) are connected to the flow standard device.