A diffusion-preventing device for repairing automobile wheel hub paint spraying

Abstract

The application discloses a kind of automobile wheel hub paint spraying repair diffusion-preventing devices, including tripod and support frame, the top plate is provided with top plate on the upper end of tripod, the top plate is connected with center shaft, the side wall of tripod is connected with annular plate, support frame is set on annular plate, first lifting mechanism is fixed on support frame, the output end of first lifting mechanism is connected with fixed plate, a plurality of special-shaped plates are connected on fixed plate, special-shaped plate is one-to-one corresponding with special-shaped hole on wheel hub, positioning mechanism is provided on annular plate, positioning mechanism can be positioned to wheel rim, the special-shaped plate on fixed plate can be released into corresponding special-shaped hole and close the upper end of special-shaped hole, the device can cover special-shaped hole, ensure paint spraying effect, simplify the work of staff, improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile wheel hub paint spraying repair auxiliary device, and particularly relates to an automobile wheel hub paint spraying repair anti-diffusion device. BACKGROUND

[0002] The automobile wheel hub is an important part of the automobile. After the automobile wheel hub is damaged, for example, scratches or small dents are generated, the automobile wheel hub needs to be repaired. After the repair, no trace is left, and the daily driving safety is not affected. In the repair process, the automobile wheel hub needs to be painted. At present, the automobile wheel hub is composed of a wheel rim, a center disc and a plurality of spokes. The center disc is provided with a center hole, and a special-shaped hole is formed between the adjacent two spokes. When the automobile wheel hub is painted, the paint needs to be prevented from entering the inner circumferential wall of the wheel rim through the special-shaped hole and adhering to the inner circumferential wall of the wheel rim, so that the inner circumferential wall of the wheel rim has many pits, which is not beautiful and affects the effect of the repaired automobile wheel hub. At present, the paper board is laid on the special-shaped hole in the form of newspaper. In the laying process, the newspaper needs to be matched with the shape of the special-shaped hole to cover the special-shaped hole. The operation is very complicated. SUMMARY

[0003] In view of the defects in the prior art, the present application provides an automobile wheel hub paint spraying repair auxiliary device. The special-shaped plate can cover the special-shaped hole, ensure the paint spraying effect, simplify the work of the workers and improve the work efficiency.

[0004] An automobile wheel hub paint spraying repair anti-diffusion device comprises a tripod and a support frame. The upper end of the tripod is provided with a top plate, the top plate is connected with a center shaft, the side wall of the tripod is connected with a ring-shaped plate, the support frame is arranged on the ring-shaped plate, a first lifting mechanism is fixed on the support frame, the output end of the first lifting mechanism is connected with a fixed plate, a plurality of special-shaped plates are connected on the fixed plate, the special-shaped plates are one-to-one corresponding to the special-shaped holes on the wheel hub, a positioning mechanism is arranged on the ring-shaped plate, the positioning mechanism can position the wheel rim, and the special-shaped plates on the fixed plate can be released into the corresponding special-shaped holes and close the upper end of the special-shaped hole.

[0005] Preferably, the positioning mechanism comprises a third lifting mechanism, a lifting plate and two positioning units. The positioning unit comprises a rotating mechanism, a horizontal rod and a vertical rod. The third lifting mechanism is fixed on the ring-shaped plate, the lifting plate is connected with the output end of the third lifting mechanism, two rotating mechanisms are arranged on the lifting plate, the horizontal rod is connected with the output shaft of the rotating mechanism, and the vertical rod is connected with the horizontal rod. The two vertical rods can be in contact with the bottom of the side wall of the special-shaped hole.

[0006] Preferably, a through hole is formed in the special-shaped plate, a cylinder is fixedly connected in the through hole, and an upper groove and a lower groove are formed in the inner wall of the cylinder.

[0007] The upper fixed plate is connected with a plurality of upper fixed shafts, the upper fixed shaft has an upper cavity, the outer end of the upper limiting block passes through the side wall of the upper cavity into the upper groove, the top wall of the upper cavity is provided with an upper sliding groove, the upper sliding block is slidably connected in the upper sliding groove, the upper spring is connected between the inner side wall of the upper sliding block and the inner side wall of the upper sliding groove, the upper limiting block is connected with the upper sliding block, the outer wall of the upper limiting block is inclined downward as a whole from the outside to the inside, the bottom wall of the upper limiting block is connected with a resisting block, the bottom wall of the resisting block is inclined downward as a whole from the outside to the inside, and the bottom wall of the upper cavity is provided with a through hole.

[0008] The annular plate is provided with an annular sliding groove, the annular sliding block is slidably connected in the annular sliding groove, the annular sliding block is provided with a second lifting mechanism, the output shaft of the second lifting mechanism is connected with an annular lifting plate, the annular sliding block is connected with a positioning plate, the annular plate is fixed with a horizontal motion mechanism, the output end of the horizontal motion mechanism is connected with a positioning block, and the positioning plate can be positioned in contact with the positioning block.

[0009] The annular lifting plate is connected with a plurality of lower fixed shafts, the upper fixed shaft, the lower fixed shaft and the special-shaped plate are in one-to-one correspondence, the lower fixed shaft has a lower cavity, the bottom wall of the lower cavity is provided with a lower sliding groove, the lower sliding block is slidably connected in the lower sliding groove, the lower spring is connected between the inner wall of the lower sliding block and the inner side wall of the lower sliding groove, the lower limiting block is movably penetrated through the side wall of the lower cavity, the lower limiting block is connected with the lower sliding block, the outer wall of the lower limiting block is a semicircular surface, the top wall of the lower fixed shaft is connected with a pressing column, the top end of the pressing column can pass through the through hole and be in contact with the bottom wall of the resisting block, the lower limiting block can be telescoped into the lower fixed shaft, the pressing column can resist the inward movement of the resisting block, thereby driving the inward movement of the upper limiting block, and after the upper limiting block completely leaves the upper groove, the outer end of the lower limiting block is completely embedded in the lower groove.

[0010] Preferably, the special-shaped plate is a paperboard.

[0011] Preferably, the rotating mechanism is an electric motor.

[0012] Preferably, the first lifting mechanism, the second lifting mechanism and the third lifting mechanism all adopt air cylinders.

[0013] Preferably, the second lifting mechanism is provided with three, and the three second lifting mechanisms are uniformly distributed around the circumferential direction of the annular sliding block axis.

[0014] Preferably, the annular sliding block is provided with a battery, the battery is connected with the second lifting mechanism and supplies power to the second lifting mechanism.

[0015] The beneficial effects of the present application are embodied in that: in the technical scheme, the annular plate is arranged on the tripod, the positioning mechanism is arranged on the annular plate, when in use, the wheel hub is placed on the top plate, the center shaft is inserted into the center hole, at this time, the positioning mechanism is used to position the wheel rim, so that the plurality of special-shaped plates correspond one by one to the plurality of special-shaped holes on the wheel hub, then the first lifting mechanism is started, the first lifting mechanism drives the fixed plate to move downward, the special-shaped plate on the fixed plate is placed in the corresponding special-shaped hole, then the first lifting mechanism is started to rise, the special-shaped plate is left in the special-shaped hole, in this way, the special-shaped plate covers the special-shaped hole, the paint spraying effect is guaranteed, the work of the staff is simplified, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Figure 1 It is a schematic diagram of the overall structure of the wheel hub.

[0018] Figure 2 It is a front view of the present application.

[0019] Figure 3 It is a schematic diagram of the overall structure of the positioning mechanism in the present application.

[0020] Figure 4 It is Figure 2 It is an enlarged structural schematic diagram of position A in the present application.

[0021] Figure 5 It is a structural schematic diagram of the special-shaped plate in the present application.

[0022] In the drawings, 1 is a rim, 2 is a spoke, 3 is a center disc, 4 is a special-shaped hole, 5 is a center hole.

[0023] 101 is a tripod, 102 is a center shaft, 103 is a first lifting mechanism, 104 is an annular plate, 105 is a fixed plate, 106 is a special-shaped plate, 107 is a cylinder, 108 is an upper groove, 109 is a lower groove, and 110 is a support frame.

[0024] 201 is a third lifting mechanism, 202 is a lifting plate, 203 is a rotating mechanism, 204 is a horizontal rod, and 205 is a vertical rod.

[0025] 301 is an upper fixed shaft, 302 is an upper cavity, 303 is an upper limiting block, 304 is an upper sliding block, 305 is an upper spring, and 306 is a bearing block.

[0026] 401-Annular slider, 402-Second lifting mechanism, 403-Annular lifting plate, 404-Lower fixed shaft, 405-Lower cavity, 406-Lower limit block, 407-Lower slider, 408-Lower spring, 409-Extrusion column, 410-Positioning plate, 411-Horizontal movement mechanism, 412-Positioning block. Detailed Implementation

[0027] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0029] Example 1

[0030] like Figures 1-4 As shown, this embodiment provides a car wheel hub paint repair anti-diffusion device, including a triangular frame 101 and a support frame 110. The upper end of the triangular frame 101 has a top plate, and a central shaft 102 is connected to the top plate. The side wall of the triangular frame 101 is connected to an annular plate 104. The support frame 110 is set on the annular plate 104. A first lifting mechanism 103 is fixed on the support frame 110. The output end of the first lifting mechanism 103 is connected to a fixing plate 105. Multiple irregular plates 106 are connected to the fixing plate 105. The irregular plates 106 correspond one-to-one with the irregular holes 4 on the wheel hub. A positioning mechanism is set on the annular plate 104. The positioning mechanism can position the wheel rim 1. The irregular plates 106 on the fixing plate 105 can be released into the corresponding irregular holes 4 and close the upper end of the irregular holes 4.

[0031] The wheel hub currently consists of a rim 1, a center disc 3, and multiple spokes 2. The center disc 3 has a center hole 5, and irregular holes 4 are formed between two adjacent spokes 2. When painting, it is necessary to prevent the sprayed paint from entering the inner circumferential wall of the rim 1 through the irregular holes 4, which would result in more pits on the inner circumferential wall of the rim 1, which is unsightly and affects the overall effect of the wheel hub after repair.

[0032] The embodiment sets the annular plate 104 on the tripod 101, sets the positioning mechanism on the annular plate 104, places the wheel hub on the top plate in use, inserts the central shaft 102 into the central hole 5, positions the wheel rim 1 by using the positioning mechanism at this time, makes the plurality of special-shaped plates 106 correspond to the plurality of special-shaped holes 4 on the wheel hub one by one, then starts the first lifting mechanism 103, drives the fixed plate 105 to move downward, places the special-shaped plate 106 on the fixed plate 105 in the corresponding special-shaped hole 4, then starts the first lifting mechanism 103 to rise, and the special-shaped plate 106 remains in the special-shaped hole 4, so that the special-shaped plate 106 covers the special-shaped hole 4, guarantees the paint spraying effect, simplifies the work of the staff, and improves the work efficiency.

[0033] Embodiment 2

[0034] The embodiment further limits on the basis of the embodiment 1, the positioning mechanism includes the third lifting mechanism 201, the lifting plate 202 and two positioning units, the positioning unit includes the rotating mechanism 203, the cross bar 204 and the vertical bar 205, the third lifting mechanism 201 is fixed on the annular plate 104, the lifting plate 202 is connected with the output end of the third lifting mechanism 201, two rotating mechanisms 203 are arranged on the lifting plate 202, the cross bar 204 is connected with the output shaft of the rotating mechanism 203, the vertical bar 205 is connected with the cross bar 204, and the two vertical bars 205 can contact the bottom of the two side walls of the special-shaped hole 4.

[0035] Specific working principle is that the wheel hub is placed on the top plate, at this time, the vertical bar 205 is located below the wheel hub, the position of the wheel hub is appropriately adjusted, the vertical bar 205 is located below the special-shaped hole 4, the third lifting mechanism 201 is started, the lifting plate 202 and the two positioning units are driven to rise, until the top end of the vertical bar 205 is located in the special-shaped hole 4, at this time, the two rotating mechanisms 203 are started, the rotating directions of the output shafts of the two rotating mechanisms 203 are opposite, drive the two cross bars 204 and the two vertical bars 205 to rotate in opposite directions, the stroke of the rotating mechanism 203 is set according to the shape of the special-shaped hole 4, when the output shafts of the two rotating mechanisms 203 run to the specified positions, the two vertical bars 205 contact the two side walls of the special-shaped hole 4, so that the wheel hub is positioned.

[0036] Embodiment 3

[0037] The embodiment further limits on the basis of the embodiment 1, the special-shaped plate 106 is provided with a through hole in the embodiment, a cylinder 107 is fixedly connected in the through hole, an upper groove 108 and a lower groove 109 are formed in the inner wall of the cylinder 107.

[0038] The fixing plate 105 is connected with a plurality of upper fixing shafts 301, the upper fixing shaft 301 has an upper cavity 302, the outer end of the upper limiting block 303 passes through the side wall of the upper cavity 302 and enters the upper groove 108, the top wall of the upper cavity 302 is provided with an upper sliding groove, the upper sliding groove is slidably connected with an upper sliding block 304, the inner side wall of the upper sliding block 304 and the inner side wall of the upper sliding groove are connected with an upper spring 305, the upper limiting block 303 is connected with the upper sliding block 304, the outer wall of the upper limiting block 303 is inclined downward as a whole from the direction of the outer side to the inner side, the bottom wall of the upper limiting block 303 is connected with a bearing block 306, the bottom wall of the bearing block 306 is inclined downward as a whole from the direction of the outer side to the inner side, and the bottom wall of the upper cavity 302 is provided with a through hole;

[0039] The annular plate 104 is provided with an annular sliding groove, the annular sliding groove is slidably connected with an annular sliding block 401, the annular sliding block 401 is provided with a second lifting mechanism 402, the output shaft of the second lifting mechanism 402 is connected with an annular lifting plate 403, the annular sliding block 401 is connected with a positioning plate 410, the annular plate 104 is fixed with a horizontal movement mechanism 411, the output end of the horizontal movement mechanism 411 is connected with a positioning block 412, and the positioning plate 410 can be positioned in contact with the positioning block 412;

[0040] The annular lifting plate 403 is connected with a plurality of lower fixing shafts 404, the upper fixing shaft 301, the lower fixing shaft 404 and the special-shaped plate 106 are in one-to-one correspondence, the lower fixing shaft 404 has a lower cavity 405, the bottom wall of the lower cavity 405 is provided with a lower sliding groove, the lower sliding groove is slidably connected with a lower sliding block 407, the inner wall of the lower sliding block 407 and the inner side wall of the lower sliding groove are connected with a lower spring 408, the lower limiting block 406 is movably penetrated through the side wall of the lower cavity 405, the lower limiting block 406 is connected with the lower sliding block 407, the outer wall of the lower limiting block 406 is a semicircular surface, the top wall of the lower fixing shaft 404 is connected with a pressing column 409, the top end of the pressing column 409 can pass through the through hole and be in contact with the bottom wall of the bearing block 306, the lower limiting block 406 can be telescoped into the lower fixing shaft 404, the pressing column 409 can bear the bearing block 306 to move inward, thereby driving the upper limiting block 303 to move inward, and after the upper limiting block 303 completely leaves the upper groove 108, the outer end of the lower limiting block 406 is completely embedded in the lower groove 109.

[0041] After the hub is positioned, the plurality of irregular plates 106 need to be released at the same time. In this embodiment, the irregular plate 106 is provided with a through hole, and a cylinder 107 is arranged in the through hole. An upper groove 108 and a lower groove 109 are formed in the cylinder 107. In the initial state, the outer end of the upper limiting block 303 enters the upper groove 108, and the outer end of the lower limiting block 406 is located outside the lower fixed shaft 404. At this time, the irregular plate 106 is fixed on the upper fixed shaft 301. The positioning block 412 connected to the horizontal movement mechanism 411 is in contact with the positioning plate 412 on the annular sliding block 401 to position the annular sliding block 401. At this time, the upper fixed shaft 301 is just located directly above the lower fixed shaft 404. The first lifting mechanism 103 is started to drive the fixed plate 105, the upper fixed shaft 301 and the irregular plate 106 to descend until the inner wall of the cylinder 107 is in contact with the top of the outer wall of the lower limiting block 406. Since the top of the outer wall of the lower limiting block 406 is arc-shaped, the lower limiting block 406 can be resisted to move into the lower fixed shaft 404. Continue to descend until the extrusion column 409 abuts against the abutting block 306 to drive the abutting block 306 to move inwardly, thereby driving the upper limiting block 303 to move inwardly until the outer end of the upper limiting block 303 is completely separated from the upper groove 108. At this time, the outer end of the lower limiting block 406 enters the lower groove 109. The first lifting mechanism 103 is moved upwardly. Since the extrusion column 409 abuts against the abutting block 306, the upper limiting block 303 moves upwardly and is separated from the cylinder 107 at this time. Thus, only the descent and ascent of the first lifting mechanism 103 can realize the release of all the irregular plates 106 from the upper fixed shaft 301. The irregular plate 106 covers and fixes the irregular hole 4 on the lower fixed shaft 404. Then the positioning mechanism and the horizontal movement mechanism 411 return to the initial position to not block the rotation of the hub. When painting, the worker can rotate the hub to paint. When the painting is completed, the positioning mechanism and the horizontal movement mechanism 411 are used to position the hub and the annular sliding block 401 so that the upper fixed shaft 301 corresponds to the lower fixed shaft 404, that is, the upper fixed shaft 301 is located directly above the lower fixed shaft 406. The first lifting mechanism 103 is started to drive the upper fixed shaft 301 to descend. The movement of the upper fixed shaft 301 drives the outer wall of the upper limiting block 303 to be in contact with the inner wall of the cylinder 107. At this time, since the outer wall of the upper limiting block 303 is inclined downwardly from the outside to the inside, the inner wall of the cylinder 107 can resist the upper limiting block 303 to enter the upper fixed shaft 301. Continue to descend until the bottom wall of the abutting block 306 is in contact with the extrusion column 409. The first lifting mechanism 103 stops moving. At this time, the second lifting mechanism 402 is started to drive the annular lifting plate 403 to descend, thereby driving the plurality of lower fixed shafts 404 to descend. At this time, since the bottom of the outer wall of the lower limiting block 406 is also arc-shaped, the lower limiting block 406 gradually moves downwardly and inwardly to the lower fixed shaft 404. The extrusion column 409 moves downwardly to release the resistance of the abutting block 306. At this time, the upper limiting block 303 enters the upper groove 108 until the lower fixed shaft 404 is completely separated from the cylinder 107.At this time, the special-shaped plate 106 is separated from the lower fixed shaft 404 and fixed on the upper fixed shaft 301, then the first lifting mechanism 103 is lifted to drive the special-shaped plate 106 to rise, at this time, all the special-shaped plates 106 are taken away from the hub and the lower fixed shaft 404, so that only the lifting and lowering work is needed in the whole operation process, without the aid of other instruments, the placement and taking away of multiple special-shaped plates 106 can be realized, the operation is simple, convenient and efficient.

[0042] The upper spring 305 and the lower spring 408 respectively provide elastic restoring force for the upper limiting block 303 and the lower limiting block 406 in the embodiment. The end of the upper spring 305 close to the axis of the upper fixed shaft 301 is the inner end, and the end of the lower spring 408 close to the axis of the lower fixed shaft 404 is the inner end. The inner side wall of the upper sliding block and the upper sliding groove refers to the side wall close to the axis of the upper fixed shaft 301. The inner side wall of the lower sliding block and the lower sliding groove refers to the side wall close to the axis of the lower fixed shaft 404.

[0043] The horizontal motion mechanism 411 is a gas cylinder in the embodiment. The special-shaped plate 106 is a paper plate in the embodiment. The rotating mechanism 203 is an electric motor in the embodiment. The first lifting mechanism 103, the second lifting mechanism 402 and the third lifting mechanism 201 all adopt gas cylinders in the embodiment. The second lifting mechanism 402 is provided in three in the embodiment, and the three second lifting mechanisms 402 are uniformly distributed around the circumferential direction of the axis of the annular sliding block 401. The annular sliding block 401 is provided with a battery, and the battery is connected with the second lifting mechanism 402 and supplies power for the second lifting mechanism 402.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

Claims

1. A device for preventing the spread of paint damage during automotive wheel hub repair, characterized in that, Includes a tripod (101) and a support frame (110). The upper end of the tripod (101) has a top plate, and a central shaft (102) is connected to the top plate. The side wall of the tripod (101) is connected to an annular plate (104). The support frame (110) is set on the annular plate (104). The first lifting mechanism (103) is fixed on the support frame (110). The output end of the first lifting mechanism (103) is connected to a fixed plate (105). Multiple irregular plates (106) are connected on the fixed plate (105). The irregular plates (106) correspond one-to-one with the irregular holes (4) on the wheel hub. A positioning mechanism is set on the annular plate (104). The positioning mechanism can position the wheel rim (1). The irregular plates (106) on the fixed plate (105) can be released into the corresponding irregular holes (4) and close the upper end of the irregular holes (4). The positioning mechanism includes a third lifting mechanism (201), a lifting plate (202), and two positioning units. The positioning unit includes a rotating mechanism (203), a horizontal bar (204), and a vertical bar (205). The third lifting mechanism (201) is fixed on the annular plate (104). The lifting plate (202) is connected to the output end of the third lifting mechanism (201). The two rotating mechanisms (203) are set on the lifting plate (202). The horizontal bar (204) is connected to the output shaft of the rotating mechanism (203). The vertical bar (205) is connected to the horizontal bar (204). The two vertical bars (205) can contact the bottom of the two side walls of the irregular hole (4). The irregularly shaped board (106) is paperboard.

2. The anti-diffusion device for automotive wheel hub paint repair according to claim 1, characterized in that, The irregular plate (106) has a through hole, and a cylinder (107) is fixedly connected inside the through hole. The inner wall of the cylinder (107) has an upper groove (108) and a lower groove (109). The fixing plate (105) is connected to multiple upper fixing shafts (301). The upper fixing shafts (301) have an upper cavity (302). The outer end of the upper limit block (303) passes through the side wall of the upper cavity (302) and enters the upper groove (108). The top wall of the upper cavity (302) is provided with an upper sliding groove. An upper slider (304) is slidably connected in the upper sliding groove. An upper spring (305) is connected between the inner side wall of the upper slider (304) and the inner side wall of the upper sliding groove. The upper limit block (303) is connected to the upper slider (304). The outer wall of the upper limit block (303) is inclined downward in the direction from the outside to the inside. The bottom wall of the upper limit block (303) is connected to a support block (306). The bottom wall of the support block (306) is inclined downward in the direction from the outside to the inside. The bottom wall of the upper cavity (302) has a through hole. The annular plate (104) is provided with an annular groove, and an annular slider (401) is slidably connected in the annular groove. A second lifting mechanism (402) is provided on the annular slider (401). An annular lifting plate (403) is connected to the output shaft of the second lifting mechanism (402). A positioning plate (410) is connected to the annular slider (401). A horizontal motion mechanism (411) is fixed on the annular plate (104). A positioning block (412) is connected to the output end of the horizontal motion mechanism (411). The positioning plate (410) can contact and position itself with the positioning block (412). Multiple lower fixed shafts (404) are connected to the annular lifting plate (403). The upper fixed shaft (301), lower fixed shaft (404), and irregular plate (106) correspond one-to-one. The lower fixed shaft (404) has a lower cavity (405). The bottom wall of the lower cavity (405) has a sliding groove. A lower slider (407) is slidably connected in the sliding groove. A lower spring (408) is connected between the inner wall of the lower slider (407) and the inner side wall of the sliding groove. A lower limit block (406) moves through the side wall of the lower cavity (405). The lower limit block (406) is connected to the lower slider (407). The outer wall of the position block (406) is a semi-circular arc surface. The top wall of the lower fixed shaft (404) is connected to the extrusion column (409). The top of the extrusion column (409) can pass through the through hole and contact the bottom wall of the support block (306). The lower limit block (406) can extend and retract into the lower fixed shaft (404). The extrusion column (409) can support the support block (306) to move inward, thereby driving the upper limit block (303) to move inward. After the upper limit block (303) completely disengages from the upper groove (108), the outer end of the lower limit block (406) is completely embedded in the lower groove (109).

3. The anti-diffusion device for automotive wheel hub paint repair according to claim 2, characterized in that, The rotating mechanism (203) is an electric motor.

4. The anti-diffusion device for automotive wheel hub paint repair according to claim 2, characterized in that, The first lifting mechanism (103), the second lifting mechanism (402) and the third lifting mechanism (201) all use cylinders.

5. The anti-diffusion device for automotive wheel hub paint repair according to claim 2, characterized in that, The second lifting mechanism (402) is configured as three, and the three second lifting mechanisms (402) are evenly distributed around the axis of the annular slider (401).

6. The anti-diffusion device for automotive wheel hub paint repair according to claim 2, characterized in that, A battery is provided on the annular slider (401), and the battery is connected to the second lifting mechanism (402) and supplies power to the second lifting mechanism (402).

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