Adjustable driving device for vehicle maintenance

Abstract

The invention provides an adjustable driving device for vehicle maintenance, which mainly comprises a cylinder body, a piston body and a piston rod, an inner cavity of the cylinder body is divided into an upper cavity and a lower cavity, and the adjustable driving device further comprises a stroke adjusting mechanism and a driving mechanism, the stroke adjusting mechanism comprises an airflow main channel, a channel opening and closing valve and a plurality of stroke adjusting channels, and each stroke adjusting channel is communicated with the inner cavity of the cylinder body; the channel opening and closing valve is used for controlling opening and closing of the stroke adjusting channel; the air inlet and outlet switching mechanism comprises an air inlet channel, an air outlet channel and an air pressure elastic switching assembly, the cylinder body is provided with an air source channel communicated with the lower cavity, the air pressure elastic switching assembly is used for controlling and switching the air source channel to be communicated with the air inlet channel or the air outlet channel, and the airflow main channel is communicated with the air pressure elastic switching assembly; and the descending end point pressure relief mechanism comprises a positioning piece, a pressure relief piece and a pressure relief rod, and when the positioning piece abuts against the pressure relief rod, the pressure relief rod retreats, and the pressure relief channel is communicated with the pressure relief opening. The device is suitable for abnormal sound overhaul of vehicles with different chassis heights.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle maintenance, and in particular to an adjustable driving device for vehicle maintenance. Background Art

[0002] Currently, in the field of vehicle maintenance, when there is abnormal noise due to damaged automotive parts, especially when some abnormal noises only occur under specific environmental conditions such as bumpy roads, it is difficult to determine the location of the abnormal noise. Currently, the following several detection methods are mostly used for detection. One is to manually shake the vehicle for detection, which requires the cooperation of multiple people and is time-consuming and laborious. The other is to use the road test method. The maintenance personnel drive the vehicle to special bumpy roads for driving to detect abnormal noises. This method has high costs and it is also difficult to determine the specific location.

[0003] Therefore, special detection devices for vehicles have begun to appear on the market. They mainly support the simulation device under the vehicle chassis and simultaneously perform reciprocating vibrations up and down to simulate the state of the vehicle under specific environments such as bumpy roads, and then detect and determine the situation of abnormal noises.

[0004] However, the chassis of vehicles has different heights according to different vehicles. In actual use, the cylinders are difficult to meet the maintenance operations of different vehicles, so improvement is needed. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an adjustable driving device for vehicle maintenance, which can be used for the abnormal noise maintenance of vehicles with different chassis heights.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] An adjustable driving device for vehicle maintenance, including a cylinder block, a piston body and a piston rod. The piston body is coaxially connected with the piston rod. The piston body is slidably arranged in the cylinder block and divides the inner cavity of the cylinder block into an upper cavity and a lower cavity. It is characterized in that it further includes:

[0008] A stroke adjustment mechanism, the stroke adjustment mechanism includes an air flow main channel, a channel opening and closing valve member and a plurality of gear stroke adjustment channels. Each of the stroke adjustment channels is communicated with the inner cavity of the cylinder block and is arranged along the sliding direction of the piston body. The channel opening and closing valve member is used to control the communication between any one of the stroke adjustment channels and the air flow main channel;

[0009] An inlet and outlet air switching mechanism, the inlet and outlet air switching mechanism comprising an inlet channel, an exhaust channel and an air pressure elastic switching component, the inlet channel is used for inputting compressed air, the exhaust channel is used for outputting compressed air, the cylinder body is provided with an air source channel communicating with the lower chamber, the air pressure elastic switching component is used for controlling and switching the air source channel to communicate with the inlet channel or the exhaust channel, the main air flow channel is connected with the air pressure elastic switching component for linkage control of the inlet and outlet air switching operation of the air pressure elastic switching component;

[0010] And a downward terminal pressure relief mechanism, the downward terminal pressure relief mechanism includes a positioning member, a pressure relief member and a pressure relief rod, the positioning member is arranged on the piston rod, the pressure relief member is provided with a pressure relief channel and a pressure relief port, the pressure relief channel is connected with the main airflow channel, the pressure relief rod is used for the opening and closing operations of the pressure relief channel and the pressure relief port, when the positioning member hits the pressure relief rod, the pressure relief rod retreats and the pressure relief channel is connected with the pressure relief port.

[0011] By setting a stroke adjustment mechanism, an air inlet and outlet switching mechanism and a downward terminal pressure relief mechanism in cooperation with the cylinder, the effect of adjusting the extension and retraction stroke of the cylinder can be achieved; in the initial state, compressed air enters through the air inlet channel, and with the cooperation of the air inlet and outlet switching mechanism, compressed air enters the lower chamber of the cylinder body from the air source channel, and the compressed air pushes the piston body upward; when the piston body moves upward to the set opening position and the stroke adjustment channel is connected with the lower chamber, the lower chamber is connected with the main airflow channel, and the compressed air enters the pressure relief channel through the main airflow channel to press the pressure relief rod, so that the downward terminal pressure relief mechanism is in a closed state, and at the same time, the compressed air enters the air pressure elastic switching component through the main airflow channel, and the compressed air entering the air pressure elastic switching component will control the air source channel and the exhaust channel The air supply channel is connected to the air intake channel, and the compressed air in the lower chamber begins to be discharged; when the piston body moves downward to the end point, the positioning piece on the piston rod will hit the pressure relief rod, causing the pressure relief rod to retreat, thereby discharging the compressed air in the pressure relief channel, that is, the main airflow channel connected to it and the compressed air in the air pressure elastic switching component connected to the main airflow channel are discharged together, and the air pressure elastic switching component, under the action of its own elastic recovery, converts the air source channel to be connected to the air intake channel, repeats the above steps, thereby realizing the reciprocating operation of the cylinder, and then the stroke adjustment channel can be adjusted to different gears according to the actual vehicle maintenance needs, thereby realizing the adjustable stroke of the drive device, and then used for abnormal noise maintenance of vehicles with different chassis heights.

[0012] Preferably, the air inlet and outlet switching mechanism further includes a forming base, and the air inlet passage, the air outlet passage and the pneumatic elastic switching component are all arranged in the forming base; the pneumatic elastic switching component includes an elastic member, a switching valve core, a pneumatic chamber and a sliding switching cavity. The pneumatic chamber and the sliding switching cavity are both arranged in the forming base and are sealed and separated by the end of the switching valve core. The switching valve core is slidably installed in the sliding switching cavity to control the connection between the air inlet passage or the air outlet passage and the air source passage. The pneumatic chamber is connected to the main air flow passage, and the elastic member is used for the elastic reset of the switching valve core.

[0013] Preferably, the elastic member and the pneumatic chamber are respectively arranged at the two axial ends of the switching valve core. The elastic member is set as a compression spring. When the exhaust passage is in the exhaust state, the compression spring is in an elastically compressed state.

[0014] Preferably, the elastic member and the pneumatic chamber are both arranged at the same side position of the switching valve core. The elastic member is set as a tension spring. When the exhaust passage is in the exhaust state, the tension spring is in an elastically stretched state.

[0015] Preferably, the switching valve core is provided with an installation groove for installing the elastic member.

[0016] Preferably, the sliding switching cavity includes a first cavity, a second cavity and a third cavity which are connected in sequence. The first cavity is connected to the exhaust passage, the second cavity is connected to the air source passage, and the third cavity is connected to the air inlet passage; the switching valve core includes a valve rod, a first sealing portion, a second sealing portion and a third sealing portion which are coaxially arranged. The first sealing portion is used for separating the first cavity and the pneumatic chamber, the second sealing portion is used for separating the first cavity and the second cavity, the third sealing portion is used for separating the second cavity and the third cavity, and the second cavity is connected to any one of the first cavity and the third cavity.

[0017] Preferably, the forming base includes a forming main body, a first side plate and a second side plate. The air inlet passage, the air outlet passage, the air source passage and the sliding switching cavity are all arranged in the forming main body. The first side plate and the second side plate are respectively arranged on both sides of the forming main body to seal both ends of the sliding switching cavity. Among them, the pneumatic chamber is arranged in the first side plate.

[0018] Preferably, a sliding groove is arranged in the first side plate, and a pneumatic top plate is hermetically slidably arranged in the sliding groove. The pneumatic chamber and the switching valve core are respectively arranged on both sides of the pneumatic top plate.

[0019] Preferably, the number of the channel opening and closing valve members is the same as that of the stroke adjustment channels. The stroke adjustment mechanism is arranged on a forming block. The main air flow channel and each gear stroke adjustment channel are formed on the forming block. The forming block is further provided with mounting holes for installing the channel opening and closing valve members, and the mounting holes are coaxially arranged with each stroke adjustment channel.

[0020] Preferably, the forming base and the forming block are hermetically connected through a sealing pipe fitting, and the pressure relief member and the forming block are hermetically connected through an external pipe.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] 1. By arranging a stroke adjustment mechanism, an air inlet and outlet switching mechanism and a downward end pressure relief mechanism to cooperate with a cylinder, the effect of adjusting the telescopic stroke of the cylinder can be achieved. The cooperation of the air inlet and outlet switching mechanism and the downward end pressure relief mechanism is used to realize an automatic linkage reciprocating operation. The setting of the stroke adjustment structure is used to realize the use of the cylinder at different stroke heights, so as to be applicable to the abnormal noise inspection of vehicles with different chassis heights.

[0023] 2. By using the ingenious structural design and simple forming structure of the stroke adjustment mechanism, the air inlet and outlet switching mechanism and the downward end pressure relief mechanism, a linkage type automatic reciprocating operation can be realized. The structure is simple and ingenious, and the effect of the whole pneumatic linkage structure is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an adjustable driving device according to an embodiment of the present application;

[0025] Figure 2 is a sectional structural diagram of an adjustable driving device according to an embodiment of the present application;

[0026] Figure 3 is a partial sectional structural diagram of an adjustable driving device according to an embodiment of the present application.

[0027] Description of the reference numerals in the drawings:

[0028] 1. Cylinder block; 2. Piston body; 3. Piston rod; 4. Upper chamber; 5. Lower chamber; 6. Main air flow channel; 7. Channel opening and closing valve member; 8. Stroke adjustment channel; 9. Intake channel; 10. Exhaust channel; 11. Air source channel; 12. Positioning member; 13. Pressure relief member; 14. Pressure relief rod; 15. Pressure relief channel; 16. Pressure relief port; 17. Switching valve core; 171. Valve rod; 172. First sealing portion; 173. Second sealing portion; 174. Third sealing portion; 18. Pneumatic chamber; 19. Sliding switching cavity; 191. First cavity; 192. Second cavity; 193. Third cavity; 20. Installation groove; 21. Forming main body; 22. First side plate; 23. Second side plate; 24. Sliding groove; 25. Pneumatic top plate; 26. Forming block; 27. Installation hole; 28. Sealing pipe fitting. Detailed implementation mode

[0029] The following is a further detailed description of this application in conjunction with the attached Figures 1-3 drawings.

[0030] The embodiment of this application discloses an adjustable driving device for vehicle maintenance. Referring to Figures 1-3 , it includes a cylinder block 1, a piston body 2 and a piston rod 3. The piston body 2 is coaxially connected to the piston rod 3. The piston body 2 is slidably arranged in the cylinder block 1 and divides the inner cavity of the cylinder block 1 into an upper chamber 4 and a lower chamber 5. It further includes:

[0031] A stroke adjustment mechanism, which includes a main air flow channel 6, a channel opening and closing valve member 7 and a number of gear stroke adjustment channels 8. Each stroke adjustment channel 8 is communicated with the inner cavity of the cylinder block 1 and is arranged along the sliding direction of the piston body 2. The channel opening and closing valve member 7 is used to control the communication between any one gear stroke adjustment channel 8 and the main air flow channel 6;

[0032] An air inlet and outlet switching mechanism, which includes an intake channel 9, an exhaust channel 10 and a pneumatic elastic switching component. The intake channel 9 is used for the input of compressed air, the exhaust channel 10 is used for the output of compressed air. The cylinder block 1 is provided with an air source channel 11 communicated with the lower chamber 5. The pneumatic elastic switching component is used to control the switching of the communication between the air source channel 11 and the intake channel 9 or the exhaust channel 10. The main air flow channel 6 is connected to the pneumatic elastic switching component to be used for linkage control of the air inlet and outlet switching operation of the pneumatic elastic switching component;

[0033] and a downstroke end pressure relief mechanism. The downstroke end pressure relief mechanism includes a positioning member 12, a pressure relief member 13, and a pressure relief rod 14. The positioning member 12 is fixed to the piston rod 3. The pressure relief member 13 is provided with a pressure relief passage 15 and a pressure relief port 16. The pressure relief passage 15 communicates with the main air flow passage 6. The pressure relief rod 14 is used for opening and closing the pressure relief passage 15 and the pressure relief port 16. When the positioning member 12 abuts against the pressure relief rod 14, the pressure relief rod 14 retracts and the pressure relief passage 15 communicates with the pressure relief port 16. Specifically, in this embodiment, the positioning member 12 is arranged as a disc coaxially fixed to the piston rod 3.

[0034] Specifically, the air inlet and outlet switching mechanism further includes a forming base. The air inlet passage 9, the exhaust passage 10, and the pneumatic elastic switching assembly are all installed in the forming base. The pneumatic elastic switching assembly includes an elastic member (not shown in the figure), a switching valve core 17, a pneumatic chamber 18, and a sliding switching cavity 19. The pneumatic chamber 18 and the sliding switching cavity 19 are both formed in the forming base and are sealed and separated by the end of the switching valve core 17. The switching valve core 17 is slidably installed in the sliding switching cavity 19 to control the communication between the air inlet passage 9 or the exhaust passage 10 and the air source passage 11. The pneumatic chamber 18 communicates with the main air flow passage 6. The elastic member is used for the elastic reset of the switching valve core 17.

[0035] In this embodiment, the elastic member and the pneumatic chamber 18 are respectively arranged at the axial two ends of the switching valve core 17. The elastic member is arranged as a compression spring. When the exhaust passage 10 is in the exhaust state, the compression spring is in an elastically compressed state.

[0036] In another embodiment, the elastic member and the pneumatic chamber 18 are both arranged at the same side position of the switching valve core 17. The elastic member is arranged as a tension spring. When the exhaust passage 10 is in the exhaust state, the tension spring is in an elastically stretched state.

[0037] The switching valve core 17 is provided with an installation groove 20 for installing the elastic member.

[0038] Specifically, the sliding and switching cavity 19 includes a first cavity 191, a second cavity 192, and a third cavity 193 that are connected in sequence. The first cavity 191 is connected to the exhaust passage 10, the second cavity 192 is connected to the air source passage 11, and the third cavity 193 is connected to the intake passage 9. The switching spool 17 includes a valve stem 171, a first sealing portion 172, a second sealing portion 173, and a third sealing portion 174 that are coaxially arranged. The first sealing portion 172 is used to separate the first cavity 191 and the air pressure cavity 18, the second sealing portion 173 is used to separate the first cavity 191 and the second cavity 192, and the third sealing portion 174 is used to separate the second cavity 192 and the third cavity 193. The second cavity 192 is connected to any one of the first cavity 191 and the third cavity 193. When the second sealing portion 173 seals and separates the first sealing cavity and the second sealing cavity, the third sealing portion 174 gives way, so that compressed air enters the air source passage 11 from the intake passage 9 and then enters the lower cavity 5 of the cylinder block 1. When the third sealing portion 174 separates the second sealing cavity and the third sealing cavity, the second sealing portion 173 gives way, and the compressed air in the lower cavity 5 begins to be discharged from the exhaust passage 10.

[0039] Specifically, the molding base includes a molding main body 21, a first side plate 22, and a second side plate 23. The intake passage 9, the exhaust passage 10, the air source passage 11, and the sliding and switching cavity 19 are all within the molding main body 21. The first side plate 22 and the second side plate 23 are respectively arranged on both sides of the molding main body 21 to seal both ends of the sliding and switching cavity 19. Among them, the air pressure cavity 18 is arranged within the first side plate 22. A connection passage (not marked in the figure) communicating with the main air flow passage 6 is provided on the molding base. A transition passage (not marked in the figure) for connecting the connection passage and the air pressure cavity 18 is provided on the first side plate 22. For the convenience of molding, a molding hole (not marked in the figure) is also provided on the first side plate 22, and subsequent sealing can be achieved through a plugging member (not shown in the figure).

[0040] Further, a sliding groove 24 is provided within the first side plate 22. An air pressure top plate 25 is hermetically slidably arranged within the sliding groove 24. The air pressure cavity 18 and the switching spool 17 are respectively arranged on both sides of the air pressure top plate 25.

[0041] Specifically, the number of the channel opening and closing valve members 7 is the same as the number of the stroke adjustment channels 8. The stroke adjustment mechanism is arranged on a molding block 26. The main air flow passage 6 and each gear stroke adjustment channel 8 are all formed on the molding block 26. The molding block 26 is also provided with an installation hole 27 for installing the channel opening and closing valve member 7. The installation hole 27 is coaxially arranged with each stroke adjustment channel 8. In this embodiment, the channel opening and closing valve member 7 adopts a knob valve and is threadedly installed in the installation hole 27, and the closing or opening of the stroke adjustment channel 8 is achieved by screwing. Specifically, the number of the channel opening and closing valve members 7 and the stroke adjustment channels 8 in the embodiment of the present application are both set to 2.

[0042] Furthermore, the forming base and the forming block 26 are hermetically connected through a sealing pipe fitting 28, and the pressure relief member 13 and the forming block 26 are hermetically connected through an external pipeline (not shown in the figure).

[0043] The implementation principle of an adjustable driving device for vehicle maintenance in the embodiment of the present application is as follows:

[0044] Place the entire driving device under the chassis of the vehicle to be maintained, press the upper end of the piston rod 3 against the vehicle chassis, and supply air to the air intake passage 9 of the driving device;

[0045] In the air intake state, compressed air enters through the air intake passage 9. Under the action of the elastic member, there is no pressure in the air pressure chamber 18. The second sealing portion 173 seals and separates the first sealing chamber and the second sealing chamber, and the third sealing portion 174 gives way, so that the compressed air enters from the air intake passage 9 into the air source passage 11 and then into the lower chamber 5 of the cylinder block 1, and the compressed air pushes the piston body 2 to move upward;

[0046] When the piston body 2 moves upward to the stroke adjustment passage 8 of the set opening gear is communicated with the lower chamber 5, the lower chamber 5 is communicated with the air flow main passage 6. The compressed air enters the pressure relief passage 15 through the air flow main passage 6 to press the pressure relief rod 14, so that the downward end pressure relief mechanism is in a closed state. At the same time, the compressed air enters the air pressure chamber 18 of the air pressure elastic switching assembly through the air flow main passage 6. The compressed air entering the air pressure chamber 18 will push the air pressure top plate 25 to slide, and then push the switching valve core 17 to slide, so that the third sealing portion 174 separates the second sealing chamber and the third sealing chamber, and the second sealing portion 173 gives way, and the compressed air in the lower chamber 5 begins to be discharged from the exhaust passage 10;

[0047] Until the piston body 2 moves downward to the end point, the positioning member 12 on the piston rod 3 will push against the pressure relief rod 14, so that the pressure relief rod 14 retracts, and then the compressed air in the pressure relief passage 15 is discharged, that is, the compressed air in the air flow main passage 6 and the air pressure chamber 18 connected thereto are discharged together. Under the action of the elastic member, there is no pressure in the air pressure chamber 18. The second sealing portion 173 seals and separates the first sealing chamber and the second sealing chamber, and the third sealing portion 174 gives way, so that the compressed air enters from the air intake passage 9 into the air source passage 11 and then into the lower chamber 5 of the cylinder block 1, and the compressed air pushes the piston body 2 to move upward. Repeating the above steps can realize the reciprocating telescopic movement of the driving device to drive the vehicle to vibrate reciprocally.

[0048] When adjusting the stroke, adjust all the channel opening and closing valve members 7 to close the stroke adjustment channels 8 of each gear, and select the applicable stroke height for adjustment to open the corresponding stroke adjustment channel 8.

[0049] The above is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An adjustable drive device for vehicle maintenance, comprising a cylinder body (1), a piston body (2) and a piston rod (3), wherein the piston body (2) and the piston rod (3) are coaxially connected, and the piston body (2) is slidably arranged in the cylinder body (1) and divides the inner cavity of the cylinder body (1) into an upper cavity (4) and a lower cavity (5), characterized in that: Also includes: A stroke adjustment mechanism, the stroke adjustment mechanism comprising a main airflow channel (6), a channel opening and closing valve (7) and a plurality of stroke adjustment channels (8), each of the stroke adjustment channels (8) being connected to the inner cavity of the cylinder body (1) and arranged along the sliding direction of the piston body (2), the channel opening and closing valve (7) being used to control the connection between any one of the stroke adjustment channels (8) and the main airflow channel (6); An air inlet and outlet switching mechanism, the air inlet and outlet switching mechanism comprising an air inlet channel (9), an air outlet channel (10) and an air pressure elastic switching component, the air inlet channel (9) is used for inputting compressed air, the air outlet channel (10) is used for outputting compressed air, the cylinder body (1) is provided with an air source channel (11) connected to the lower chamber (5), the air pressure elastic switching component is used for controlling the switching of the air source channel (11) to be connected to the air inlet channel (9) or the air outlet channel (10), the main air flow channel (6) is connected to the air pressure elastic switching component to be used for linkage control of the air inlet and outlet switching operation of the air pressure elastic switching component; and a downward end point pressure relief mechanism, the downward end point pressure relief mechanism comprising a positioning member (12), a pressure relief member (13) and a pressure relief rod (14); the positioning member (12) is arranged on the piston rod (3); the pressure relief member (13) is provided with a pressure relief channel (15) and a pressure relief port (16); the pressure relief channel (15) is connected to the main air flow channel (6); the pressure relief rod (14) is used for opening and closing the pressure relief channel (15) and the pressure relief port (16); when the positioning member (12) pushes against the pressure relief rod (14), the pressure relief rod (14) retreats and the pressure relief channel (15) is connected to the pressure relief port (16).

2. The adjustable drive device for vehicle maintenance according to claim 1, characterized in that: The air inlet and outlet switching mechanism also includes a molding base, and the air inlet channel (9), the air outlet channel (10) and the air pressure elastic switching component are all arranged in the molding base; The pneumatic elastic switching component comprises an elastic member, a switching valve core (17), an air pressure cavity (18) and a sliding switching cavity (19); the air pressure cavity (18) and the sliding switching cavity (19) are both arranged in a molding base and are sealed and separated by the end of the switching valve core (17); the switching valve core (17) is slidingly installed in the sliding switching cavity (19) to control the connection between the air intake channel (9) or the exhaust channel (10) and the air source channel (11); the air pressure cavity (18) is connected to the main air flow channel (6); and the elastic member is used for elastic reset of the switching valve core (17).

3. The adjustable driving device for vehicle maintenance according to claim 2, characterized in that: The elastic member and the air pressure chamber (18) are arranged at two axial ends of the switching valve core (17), and the elastic member is configured as a compression spring. When the exhaust channel (10) is in an exhaust state, the compression spring is in an elastic compression state.

4. The adjustable driving device for vehicle maintenance according to claim 2, characterized in that: The elastic member and the air pressure chamber (18) are both arranged on the same side of the switching valve core (17), and the elastic member is arranged as a tension spring. When the exhaust channel (10) is in an exhaust state, the tension spring is in an elastic tension state.

5. An adjustable driving device for vehicle maintenance according to any one of claims 3 or 4, characterized in that: The switching valve core (17) is provided with a mounting groove (20) for mounting the elastic member.

6. The adjustable driving device for vehicle maintenance according to claim 2, characterized in that: The sliding switching cavity (19) comprises a first cavity (191), a second cavity (192) and a third cavity (193) which are arranged in sequence and connected to each other; the first cavity (191) is connected to the exhaust passage (10), the second cavity (192) is connected to the air source passage (11), and the third cavity (193) is connected to the air intake passage (9); the switching valve core (17) comprises a valve stem (171), a first sealing portion (172), a second sealing portion (173) and a third sealing portion (193) which are arranged coaxially. A sealing portion (174), wherein the first sealing portion (172) is used to separate the first cavity (191) and the air pressure cavity (18), the second sealing portion (173) is used to separate the first cavity (191) and the second cavity (192), the third sealing portion (174) is used to separate the second cavity (192) and the third cavity (193), and the second cavity (192) is connected to any one of the first cavity (191) and the third cavity (193).

7. The adjustable driving device for vehicle maintenance according to claim 2, characterized in that: The molding base comprises a molding body (21), a first side plate (22) and a second side plate (23); the air inlet channel (9), the exhaust channel (10), the air source channel (11) and the sliding switching cavity (19) are all in the molding body (21); the first side plate (22) and the second side plate (23) are respectively arranged on both sides of the molding body (21) to seal the two ends of the sliding switching cavity (19); wherein the air pressure cavity (18) is arranged in the first side plate (22).

8. The adjustable driving device for vehicle maintenance according to claim 7, characterized in that: A sliding groove (24) is provided in the first side plate (22), a pneumatic top plate (25) is provided in the sliding groove (24) in a sealing and sliding manner, and the pneumatic chamber (18) and the switching valve core (17) are respectively provided on both sides of the pneumatic top plate (25).

9. The adjustable driving device for vehicle maintenance according to claim 2, characterized in that: The number of the channel opening and closing valve components (7) is consistent with the number of the stroke adjustment channels (8); the stroke adjustment mechanism is arranged on a molding block (26); the main airflow channel (6) and the stroke adjustment channels (8) of each gear are molded on the molding block (26); the molding block (26) is also provided with a mounting hole (27) for mounting the channel opening and closing valve components (7); the mounting hole (27) is coaxially arranged with each of the stroke adjustment channels (8).

10. The adjustable driving device for vehicle maintenance according to claim 9, characterized in that: The molding base and the molding block (26) are sealed via a sealing pipe (28), and the pressure relief component (13) and the molding block (26) are sealed via an external pipeline.

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