Stay wire support used in cooperation with four-wheel positioning equipment

By introducing an adjustment mechanism and a removable fixing cylinder into the wire pulling bracket, the problem that cannot be adjusted in the prior art is solved, the measurement accuracy and operation convenience are improved, and the positioning needs of different vehicle shapes are adapted.

CN222144536UActive Publication Date: 2024-12-10TAISHAN DACHENG IND DEV CO LTD
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Patent Information

Application Number
CN202420960129.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-06
Publication Date
2024-12-10
Estimated Expiration
2034-05-06

AI Technical Summary

Technical Problem

The existing pull-wire bracket cannot be adjusted according to the shape of the vehicle, resulting in low measurement accuracy.

Method used

A wire pulling bracket including an adjustment mechanism is designed, and clamping and loosening the first direction tube, the second direction tube and the third direction tube are achieved by using a clamping sleeve and a fixing cap to facilitate adjustment of its position, and combined with the removable Fixed cylinder and scale groove to adapt to different vehicle shapes.

Benefits of technology

It realizes fast and simple adjustment, improves measurement accuracy and operational convenience, and adapts to positioning needs of different vehicle shapes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a stay wire support used in cooperation with four-wheel positioning equipment. The stay wire support comprises two adjusting mechanisms, a first direction pipe, two second direction pipes, two third direction pipes and a stay wire pipe. The adjusting mechanism comprises a shell; the three clamping sleeves are arranged on the shell and are distributed in the X direction, the Y direction and the Z direction; the clamping sleeve is provided with a plurality of clamping pieces which are separately arranged at intervals, and a clamping space is defined by the multiple clamping pieces; the three fixing caps are rotationally connected with the clamping sleeve; according to the invention, clamping and loosening of the first direction pipe, the second direction pipe and the third direction pipe are realized by innovatively utilizing the cooperation of the clamping sleeve and the fixing cap on the adjusting mechanism, so that an operator can conveniently and quickly adjust the position relationship between the first direction pipe, the second direction pipe and the third direction pipe and the adjusting mechanism; the technical problem that in the prior art, a stay wire support cannot be adjusted according to the shape of a vehicle is solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of four-wheel alignment, in particular to a wire bracket used in conjunction with four-wheel alignment equipment. Background Art

[0002] Four-wheel alignment is based on the parameters of the four wheels of the vehicle. Through precise measurement, the measurement results are compared with the original design standards, and then the vehicle is adjusted, repaired, etc., so that the car meets the original standards and achieves the best handling and driving conditions. At present, in the process of four-wheel alignment, two cable brackets need to be placed at the front and rear of the vehicle respectively, and a wire is pulled on each side of the left and right sides of the vehicle, so that the height of the tube and wire of the cable bracket should be maintained at the height of the center of the wheel axle, and it is necessary to ensure that the four angles between the tube and the wire are precisely 90°, and all the tubes and wires are horizontal. However, the cable bracket of the prior art is just a simple pipe overlap, lacks an adjustable mechanism, and cannot be changed according to the shape of the vehicle, resulting in low measurement accuracy. Utility Model Content

[0003] The main purpose of the utility model is to provide a cable bracket used in conjunction with a four-wheel alignment device, aiming to solve the technical problem that the cable bracket in the prior art cannot be adjusted according to the shape of the vehicle.

[0004] In order to achieve the above purpose, the technical solutions of the utility model include:

[0005] The utility model provides a wire bracket used in conjunction with a four-wheel alignment device, comprising:

[0006] Two adjustment mechanisms, a first directional tube, two second directional tubes, two third directional tubes and a wire pulling tube;

[0007] Wherein, the regulating mechanism comprises:

[0008] case;

[0009] Three clamping sleeves, the clamping sleeves are arranged on the housing and distributed in the X direction, the Y direction and the Z direction; the clamping sleeve is provided with a plurality of clamping sheets arranged separately at intervals, and the plurality of clamping sheets enclose a clamping space;

[0010] and three fixing caps, the fixing caps being rotatably connected to the clamping sleeve;

[0011] When the fixing cap rotates forward, the fixing cap presses the clamping sheet to narrow the clamping space; when the fixing cap rotates reversely, the fixing cap releases the clamping sheet to widen the clamping space;

[0012] The first direction tube is movably arranged in the clamping space of the clamping sleeve located in the X direction;

[0013] The second directional tube is movably arranged in the clamping space of the clamping sleeve located in the Y direction;

[0014] The third directional tube is movably arranged in the clamping space of the clamping sleeve located in the Z direction, and the lower end of the third directional tube is connected to the wire drawing tube.

[0015] Compared with the prior art, the present application innovatively utilizes the cooperation between the clamping sleeve on the adjusting mechanism and the fixing cap to realize the clamping and loosening of the first directional tube, the second directional tube and the third directional tube, thereby facilitating the operator to quickly adjust the position relationship between the first directional tube, the second directional tube and the third directional tube and the adjusting mechanism, thereby solving the technical problem in the prior art that the wire bracket cannot be adjusted according to the shape of the vehicle.

[0016] In one embodiment, the housing is provided with three mounting grooves, and the three mounting grooves are respectively arranged corresponding to the X direction, the Y direction and the Z direction;

[0017] The adjustment mechanism also includes three fixing tubes, which are respectively inserted into the three mounting grooves; a through hole is provided in the fixing tube for the first directional tube or the second directional tube or the third directional tube to pass through; the fixing tube is fixedly installed with the clamping sleeve.

[0018] In one embodiment, a limiting portion extending outward is provided on the outer circumference of the fixing tube, and the limiting portion abuts against the outer surface of the shell.

[0019] In one embodiment, the clamping sleeve is provided with a clamping end and a mounting end, the clamping end is provided with a plurality of the clamping sheets, and the mounting end is connected to the fixing tube.

[0020] In one embodiment, the fixing cap includes a pressing portion and an operating portion, and the pressing portion is connected to the operating portion;

[0021] The pressing portion is arranged corresponding to the clamping sheet, and the pressing portion is arranged to be inclined inwards;

[0022] When the fixing cap rotates in the forward direction, the pressing portion presses the clamping piece to make the clamping piece tilt inward to narrow the clamping space.

[0023] In one embodiment, the second direction tube is provided with a hook, and the hook is used for fixing to the vehicle.

[0024] In one embodiment, the buckle hook includes a first mounting portion and a first bending portion, and the first mounting portion is connected to one end of the second directional tube;

[0025] The first bending portion is connected to the first mounting portion, and a first angle is provided between the first bending portion and the first mounting portion; wherein the first angle is 90° to 180°.

[0026] In one embodiment, the buckle hook includes a second mounting portion, a second bending portion and a second hook portion, and the second mounting portion is connected to one end of the second directional tube;

[0027] The second mounting portion is connected to the second hook portion through the second bending portion, a second angle is set between the second bending portion and the second mounting portion, and a third angle is set between the second bending portion and the second hook portion;

[0028] Among them, the second angle is 100° to 150°, and the third angle is 100° to 150°.

[0029] In one embodiment, a sponge tube is sleeved on the third directional tube.

[0030] In one embodiment, the wire pulling tube includes a connecting tube and two detachable tubes, wherein the connecting tube is detachably connected to the two detachable tubes; and a plurality of scale grooves are provided on the outer peripheral surface of the detachable tube.

[0031] In order to better understand and implement the present invention, the following figure is combined with the accompanying drawings to explain the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0033] Figure 1 It is a three-dimensional diagram of the front cable bracket of the utility model;

[0034] Figure 2 This is a disassembled diagram of the front cable bracket of the utility model;

[0035] Figure 3 yes Figure 2 A magnified view of middle;

[0036] Figure 4 yes Figure 2 Enlarged view of middle B;

[0037] Figure 5 yes Figure 2 Enlarged view of middle C;

[0038] Figure 6 It is a schematic diagram of the adjustment mechanism of the utility model;

[0039] Figure 7It is a three-dimensional diagram of the rear cable bracket of the utility model;

[0040] Figure 8 is a schematic diagram of the second hook of the utility model;

[0041] Fig. 9 The utility model is a schematic diagram of the use of a wire bracket used in conjunction with a four-wheel alignment device.

[0042] Description of reference numerals:

[0043] 10 adjustment mechanism, 110 housing, 111 mounting groove, 120 clamping sleeve, 121 clamping sheet, 122 clamping space, 123 clamping end, 124 mounting end, 130 fixing cap, 131 pressing part, 132 operating part, 140 fixing cylinder, 141 limiting part, 20 first direction tube, 30 second direction tube, 310 first hook, 311 first mounting part, 312 first bending part, 320 second hook, 321 second mounting part, 322 second bending part, 323 second hook, 40 third direction tube, 410 sponge tube, 420 support hook, 430 sleeve, 50 wire pulling tube, 510 connecting tube, 520 split tube, 521 scale groove, 530 double-head connector DETAILED DESCRIPTION

[0044] In order to better illustrate the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0045] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0046] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0047] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the description of the present invention, it should be understood that the terms "vertical", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0049] Combination Figures 1 to 9 As shown, the utility model provides a cable bracket used in conjunction with a four-wheel alignment device, comprising:

[0050] Two adjustment mechanisms 10, a first direction tube 20, two second direction tubes 30, two third direction tubes 40 and a wire pulling tube 50; wherein the adjustment mechanism 10 comprises: a housing 110; three clamping sleeves 120, the clamping sleeves 120 are arranged on the housing 110 and are distributed in the X direction, the Y direction and the Z direction; the clamping sleeve 120 is provided with a plurality of clamping pieces 121 arranged separately at intervals, and the plurality of clamping pieces 121 surround a clamping space 122; and three fixing caps 130, the fixing caps 130 are rotatably connected to the clamping sleeves 120;

[0051] When the fixing cap 130 rotates forward, the fixing cap 130 presses the clamping sheet 121 to narrow the clamping space 122; when the fixing cap 130 rotates reversely, the fixing cap 130 releases the clamping sheet 121 to widen the clamping space 122;

[0052] The first directional tube 20 is movably disposed in the clamping space 122 of the clamping sleeve 120 located in the X direction; the second directional tube 30 is movably disposed in the clamping space 122 of the clamping sleeve 120 located in the Y direction; the third directional tube 40 is movably disposed in the clamping space 122 of the clamping sleeve 120 located in the Z direction, and the lower end of the third directional tube 40 is connected to the wire pulling tube 50.

[0053] Compared with the prior art, the present application innovatively utilizes the cooperation between the clamping sleeve 120 on the adjustment mechanism 10 and the fixing cap 130 to achieve the clamping and loosening of the first directional tube 20, the second directional tube 30 and the third directional tube 40, so that the operator can quickly adjust the positional relationship between the first directional tube 20, the second directional tube 30 and the third directional tube 40 and the adjustment mechanism 10, solving the technical problem that the cable bracket in the prior art cannot be adjusted according to the shape of the vehicle. Moreover, the adjustment process is simple and quick, and only the fixing cap 130 needs to be rotated.

[0054] In one embodiment, the shell 110 is provided with three mounting grooves 111, and the three mounting grooves 111 are respectively arranged corresponding to the X direction, the Y direction and the Z direction; the adjustment mechanism 10 also includes three fixing cylinders 140, and the three fixing cylinders 140 are respectively inserted into the three mounting grooves 111; the fixing cylinder 140 is provided with a through hole for the first direction tube 20 or the second direction tube 30 or the third direction tube 40 to pass through; the fixing cylinder 140 is fixedly installed with the clamping sleeve 120. The present application uses the above method to realize the detachable connection between the fixing cylinder 140 and the shell 110, and the detachable connection between the fixing cylinder 140 and the clamping sleeve 120, so as to facilitate the targeted replacement of components when they are damaged.

[0055] Specifically, the housing 110 has three mounting grooves 111, the first mounting groove 111 is arranged corresponding to the X direction, the second mounting groove 111 is arranged corresponding to the Y direction, and the third mounting groove 111 is arranged corresponding to the Z direction; similarly, the number of the fixing tubes 140 is also three, the first fixing tube 140 is inserted in the first mounting groove 111 and arranged corresponding to the X direction, the second fixing tube 140 is inserted in the second mounting groove 111 and arranged corresponding to the Y direction, and the third fixing tube 140 is inserted in the second mounting groove 111 and arranged corresponding to the Z direction; the first directional tube 20 passes through the through hole of the first mounting groove 111 and is clamped and fixed by the clamping sleeve 120, the second directional tube 30 passes through the through hole of the second mounting groove 111 and is clamped and fixed by the clamping sleeve 120, and the third directional tube 40 passes through the through hole of the third mounting groove 111 and is clamped and fixed by the clamping sleeve 120.

[0056] Furthermore, a limiting portion 141 extending outward is provided on the outer circumference of the fixing tube 140 , and the limiting portion 141 abuts against the outer surface of the shell 110 , so as to limit the position of the fixing tube 140 in the shell 110 .

[0057] Furthermore, the clamping sleeve 120 is provided with a clamping end 123 and a mounting end 124 , the clamping end 123 is provided with a plurality of the clamping pieces 121 , and the mounting end 124 is connected to the fixing tube 140 .

[0058] In one embodiment, the fixing cap 130 includes a clamping portion 131 and an operating portion 132, and the clamping portion 131 is connected to the operating portion 132; the clamping portion 131 is arranged corresponding to the clamping piece 121, and the clamping portion 131 is arranged to be inclined inward; when the fixing cap 130 rotates forward, the clamping portion 131 presses the clamping piece 121 to make the clamping piece tilt inward, thereby narrowing the clamping space 122.

[0059] When the fixing cap 130 rotates forward (i.e., tightens the fixing cap 130), the pressing portion 131 presses down the clamping piece 121, so that the clamping piece tilts inward, narrows the clamping space 122, and fixes the first directional tube 20, the second directional tube 30, or the third directional tube 40 located in the clamping space 122;

[0060] When the fixing cap 130 is rotated in the opposite direction (i.e., the fixing cap 130 is loosened), the clamping portion 131 no longer presses down the clamping piece 121, so that the clamping piece is reset and the clamping space 122 is widened, thereby unlocking the first directional tube 20 or the second directional tube 30 or the third directional tube 40 located in the clamping space 122.

[0061] Furthermore, the operating portion 132 is provided with an internal thread, and the clamping sleeve 120 is provided with an external thread that cooperates with the internal thread. Through the cooperation of the internal thread and the external thread, the fixing cap 130 can rotate forward or reverse when the operating portion 132 is tightened or loosened.

[0062] In one embodiment, in order to better utilize the vehicle for fixing, a hook is provided on the second direction tube 30, and the hook is used to fix with the vehicle to stabilize the position of the wire bracket of the present application.

[0063] There are many embodiments of the shape of the buckle hook. In one embodiment, the buckle hook includes a first mounting portion 311 and a first bending portion 312. The first mounting portion 311 is connected to one end of the second directional tube 30; the first bending portion 312 is connected to the first mounting portion 311, and a first angle is provided between the first bending portion 312 and the first mounting portion 311; wherein the first angle is 90° to 180°. Preferably, the first angle is 90°. The present application utilizes the first bending portion 312 to hook the irregular position of the front of the vehicle to achieve the positioning and fixation of the cable bracket located at the front of the vehicle. For the convenience of subsequent description, the buckle hook of this embodiment is the first buckle hook 310.

[0064] In another embodiment, the hook includes a second mounting portion 321, a second bending portion 322 and a second hook portion 323, wherein the second mounting portion 321 is connected to one end of the second directional tube 30; the second mounting portion 321 is connected to the second hook portion 323 through the second bending portion 322, a second angle is provided between the second bending portion 322 and the second mounting portion 321, and a third angle is provided between the second bending portion 322 and the second hook portion 323; wherein the second angle is 100° to 150°, and the third angle is 100° to 150°. Preferably, the second angle and the third angle are both 120°, and the hook portion is arranged parallel to the mounting portion. The present application utilizes the second bending portion 322 and the second hook portion 323 to hook the special-shaped position of the rear of the vehicle to realize the positioning and fixing of the cable bracket located at the rear of the vehicle. For the convenience of subsequent description, the hook of this embodiment is the second hook 320.

[0065] In one embodiment, a sponge tube 410 is sleeved on the third directional tube 40, and the vehicle paint is protected by the sponge tube 410 to prevent the third directional tube 40 from scratching the vehicle paint when it contacts the vehicle.

[0066] In one embodiment, the wire pulling tube 50 includes a connecting tube 510 and two detachable tubes 520. The connecting tube 510 is detachably connected to the two detachable tubes 520 so as to be combined with detachable tubes 520 of different lengths to adjust the shape of the vehicle. The outer peripheral surface of the detachable tube 520 is provided with a plurality of scale grooves 521, and the scale grooves 521 are used to place the counterweight wire, so as to cooperate with the positioning equipment for adjustment and measurement.

[0067] Furthermore, the connecting tube 510 and the splitting tube 520 are connected via a double-head connecting piece 530 .

[0068] Further, regarding the connection between the third directional tube 40 and the wire drawing tube 50, a support hook 420 is provided at the lower end of one of the third directional tubes 40, and a collar 430 is provided at the lower end of the other third directional tube 40, and a locking member is provided on the collar 430; the wire drawing tube 50 passes through the collar 430 and is supported by the support hook 420, and when the position of the wire drawing tube 50 needs to be adjusted, the locking member is loosened to release the fixation, and after the position of the wire drawing tube 50 is adjusted along the X direction, the bolt is tightened to fix it. This embodiment simplifies the operation of adjusting the position of the wire drawing tube 50 by fixing it at a single point.

[0069] The working principle of the cable bracket used in conjunction with the four-wheel alignment equipment in this application is as follows:

[0070] When performing four-wheel alignment, the cable brackets of the present application are placed at the front and rear positions of the vehicle, respectively. For ease of understanding, they are divided into a front cable bracket and a rear cable bracket, wherein the front cable bracket is equipped with a first hook 310, and the rear cable bracket is equipped with a second hook 320;

[0071] The operator loosens all the fixing caps 130 of the front cable bracket and the rear cable bracket according to the shape and size of the vehicle, so that the first directional tube 20, the two second directional tubes 30, and the two third directional tubes 40 of the cable bracket can be adjusted in position. After the position is adjusted, the fixing caps 130 are tightened to fix the first directional tube 20, the two second directional tubes 30, and the two third directional tubes 40;

[0072] The operator then hooks the first hook 310 onto the irregular position of the front of the vehicle to achieve positioning and fixing of the front cable bracket and the front of the vehicle, and hooks the second hook 320 onto the irregular position of the rear of the vehicle to achieve positioning and fixing of the rear cable bracket and the front of the vehicle.

[0073] Finally, a counterweight cable is pulled on the left and right sides of the front cable bracket and the rear cable bracket, and the four-wheel alignment device is adjusted and measured in conjunction with the scale groove 521 of the cable bracket.

[0074] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A cable bracket used in conjunction with a four-wheel alignment device, characterized in that: include: Two adjustment mechanisms, a first directional tube, two second directional tubes, two third directional tubes and a wire pulling tube; Wherein, the regulating mechanism comprises: case; Three clamping sleeves, the clamping sleeves are arranged on the housing and distributed in the X direction, the Y direction and the Z direction; the clamping sleeve is provided with a plurality of clamping sheets arranged separately at intervals, and the plurality of clamping sheets enclose a clamping space; and three fixing caps, the fixing caps being rotatably connected to the clamping sleeve; When the fixing cap rotates forward, the fixing cap presses the clamping sheet to narrow the clamping space; when the fixing cap rotates reversely, the fixing cap releases the clamping sheet to widen the clamping space; The first direction tube is movably arranged in the clamping space of the clamping sleeve located in the X direction; The second directional tube is movably arranged in the clamping space of the clamping sleeve located in the Y direction; The third directional tube is movably arranged in the clamping space of the clamping sleeve located in the Z direction, and the lower end of the third directional tube is connected to the wire drawing tube.

2. The cable bracket used in conjunction with the four-wheel alignment device according to claim 1, characterized in that: The housing is provided with three mounting grooves, which are respectively arranged in the X direction, the Y direction and the Z direction; The adjustment mechanism also includes three fixing tubes, which are respectively inserted into the three mounting grooves; a through hole is provided in the fixing tube for the first directional tube or the second directional tube or the third directional tube to pass through; the fixing tube is fixedly installed with the clamping sleeve.

3. The cable bracket used in conjunction with the four-wheel alignment device according to claim 2, characterized in that: A limiting portion extending outward is disposed on the outer circumference of the fixing tube, and the limiting portion abuts against the outer surface of the shell.

4. The cable bracket used in conjunction with the four-wheel alignment device according to claim 2, characterized in that: The clamping sleeve is provided with a clamping end and a mounting end, the clamping end is provided with a plurality of clamping sheets, and the mounting end is connected to the fixing tube.

5. The cable bracket used in conjunction with the four-wheel alignment device according to claim 1, characterized in that: The fixing cap includes a pressing portion and an operating portion, and the pressing portion is connected to the operating portion; The pressing portion is arranged corresponding to the clamping sheet, and the pressing portion is arranged to be inclined inwards; When the fixing cap rotates in the forward direction, the pressing portion presses the clamping piece to make the clamping piece tilt inward to narrow the clamping space.

6. The cable bracket used in conjunction with a four-wheel alignment device according to claim 1, characterized in that: The second direction tube has a hook on it, and the hook is used to be fixed to the vehicle.

7. The cable bracket used in conjunction with the four-wheel alignment device according to claim 6, characterized in that: The buckle hook comprises a first mounting portion and a first bending portion, wherein the first mounting portion is connected to one end of the second directional tube; The first bending portion is connected to the first mounting portion, and a first angle is provided between the first bending portion and the first mounting portion; wherein the first angle is 90° to 180°.

8. The cable bracket used in conjunction with the four-wheel alignment device according to claim 6, characterized in that: The buckle hook comprises a second mounting portion, a second bending portion and a second hook portion, and the second mounting portion is connected to one end of the second directional tube; The second mounting portion is connected to the second hook portion through the second bending portion, a second angle is set between the second bending portion and the second mounting portion, and a third angle is set between the second bending portion and the second hook portion; Among them, the second angle is 100° to 150°, and the third angle is 100° to 150°.

9. The cable bracket used in conjunction with a four-wheel alignment device according to claim 1, characterized in that: The third directional tube is sleeved with a sponge tube.

10. The cable bracket used in conjunction with a four-wheel alignment device according to claim 1, characterized in that: The wire pulling tube comprises a connecting tube and two detaching tubes, wherein the connecting tube is detachably connected to the two detaching tubes; and a plurality of scale grooves are arranged on the outer peripheral surface of the detaching tube.