Rim positioning device

Abstract

The utility model relates to a rim positioning device which comprises a large fixing disc, a sliding seat, an upper sliding block, a lower sliding block and a driving mechanism, the sliding seat is arranged on the large fixing disc, the upper sliding block and the lower sliding block are both movably connected to the sliding seat, one end of the upper sliding block and one end of the lower sliding block are close to the middle of the large fixing disc, and the other end of the upper sliding block and the other end of the lower sliding block face the inner wall of a rim. The upper sliding block and the lower sliding block move in the direction close to or away from the middle of the large fixing disc and are distributed in the circumferential direction, and the driving mechanism is used for driving the sliding blocks to move on the sliding base. Two positions of the rim are positioned through the upper sliding block and the lower sliding block, so that the positioning precision and reliability of the rim are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel rim detection equipment, in particular to a wheel rim positioning device. Background Art

[0002] The rim is an important component of the wheel and plays a key role in the smooth driving of the vehicle. The concentricity of the rim is an important criterion for measuring whether the rim is qualified. At present, when testing the rim, only a small part of one side of the rim is often positioned, which easily leads to unstable positioning, resulting in insufficient or inaccurate measurement data during the concentricity detection process. Summary of the invention

[0003] The purpose of the utility model is to provide a rim positioning device for solving the above-mentioned problem.

[0004] To achieve the above-mentioned purpose, the utility model discloses a rim positioning device, comprising: a large fixed plate, a slide seat, an upper slider, a lower slider and a driving mechanism, the large fixed plate is provided with a slide seat, the upper slider and the lower slider are both movably connected to the slide seat, one end of the upper slider and the lower slider are close to the middle of the large fixed plate, and the other end is toward the inner wall of the rim, the upper slider and the lower slider move in a direction approaching or away from the middle of the large fixed plate, the upper slider and the lower slider are distributed along the circumference, and the driving mechanism is used to drive the slider to move on the slide seat.

[0005] Preferably, the slide seat is provided with a horizontally arranged upper guide hole and a lower guide hole, the upper guide hole is arranged above the lower guide hole, the upper slider is movably installed in the upper guide hole, and the lower slider is movably installed in the lower guide hole.

[0006] Preferably, six slide seats are evenly distributed along the circumference of the large fixed plate, a movable block is provided at one end of the upper sliding block close to the rim, vertically arranged axial holes are provided on the upper sliding block and the movable block, a rotating pin is provided in the axial hole, and the movable block rotates around the rotating pin.

[0007] Preferably, the driving mechanism includes an upper wedge block, a lower wedge block, a pull rod, a power device, a shaft, a pressure block and a slider reset device. A pull rod moving along the vertical direction is arranged in the middle of the large fixed disk, and the pull rod is driven by the power device. The shaft is a hollow structure and is sleeved on the outside of the pull rod. A first axial hole is opened through the middle of the lower wedge block, a second axial hole is opened upward at the bottom of the upper wedge block, and a third axial hole is opened upward at the top of the second axial hole and passes through the upper wedge block, and the shaft is rotatably connected to the first axial hole and the second axial hole; a cross guide groove is opened from top to bottom at the top of the shaft, and the pressure block is composed of a cross guide block, an upper disc and a lower ring, the upper disc is fixedly arranged on the top of the cross guide block, and the bottom of the cross guide block extends to the inner part of the lower ring. The cam is fixedly connected to the lower ring, and a fourth axial hole is formed through the middle of the pressure block, and the pull rod passes through the fourth axial hole. The upper disk of the pressure block is arranged in the second axial hole and fixedly connected to the pull rod, and the cross guide groove cooperates with the cross guide block. After the pressure block is installed, the lower ring is located at the bottom of the upper wedge block, and the diameter of the lower ring is larger than the diameter of the second axial hole; the upper wedge block abuts against the end of the upper slider, and the lower wedge block abuts against the end of the lower slider. An inclined first inclined surface is provided at the abutment between the upper wedge block and the upper slider, and an inclined second inclined surface is provided at the abutment between the lower wedge block and the lower slider. When the pull rod moves downward, the upper wedge block and the lower wedge block are driven to move downward, thereby driving the upper slider and the lower slider to move in the direction away from the pull rod.

[0008] Preferably, the end of the upper slider close to the pull rod is provided with a third inclined surface that fits with the first inclined surface, and the end of the lower slider close to the pull rod is provided with a fourth inclined surface that fits with the second inclined surface.

[0009] Preferably, the shape of the contact portion between the upper wedge block and the upper slider is a hexagonal pyramid, and the shape of the contact portion between the lower wedge block and the lower slider is a hexagonal pyramid.

[0010] Preferably, a third elastic member is installed on the top of the upper wedge block, and a fixing member for fixing the third elastic member is provided on the pull rod, and the third elastic member is compressed when the pull rod moves downward.

[0011] Preferably, the power device is a cylinder, and the slider resetting device includes a first elastic member and a second elastic member. Both sides of the upper guide hole and the lower guide hole are provided with through grooves connected to the outside world. One end of the first elastic member is fixed on the side wall of the slide seat close to one end of the pull rod, and the other end is installed on the upper slide through the through groove. One end of the second elastic member is fixed on the side wall of the slide seat close to one end of the pull rod, and the other end is installed on the lower slide through the through groove. When the upper slide and the lower slide move in the direction away from the pull rod, the first elastic member and the second elastic member are pulled.

[0012] Preferably, it also includes a bearing seat and a small fixed plate, the small fixed plate is installed at the bottom of the large fixed plate, the bearing seat is arranged at the bottom of the small fixed plate, and the cylinder is installed at the bottom of the bearing seat; first bearings are fixedly installed at both ends of the bearing seat, and the two first bearings are matched with the shaft, and a shoulder is arranged in the middle of the shaft, the top of the shoulder is fixedly connected to the small fixed plate, and the bottom of the shoulder abuts against the first bearing on the bearing seat, and a second bearing is also arranged between the upper wedge block and the third elastic member.

[0013] Preferably, a bearing seat is provided at the top of the lower wedge block, a third bearing is installed in the bearing seat, the bearing seat is sealed by a pressure block, and the shaft cooperates with the third bearing.

[0014] The utility model has the following beneficial effects:

[0015] 1. The upper slider and the lower slider are used to position the rim at two locations, thereby increasing the accuracy and reliability of rim positioning.

[0016] 2. The spring can absorb the excess travel of the upper wedge block, thereby preventing the upper slider from squeezing and deforming the rim. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure provided in a specific embodiment of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of the wheel rim after positioning provided in a specific embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the installation of the slide seat and the upper and lower slide blocks provided in a specific embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the installation of the shaft and the pressing block provided in a specific embodiment of the utility model;

[0021] Figure 5 It is an exploded schematic diagram of the shaft and the pressing block provided in a specific embodiment of the utility model;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a pressing block provided in a specific embodiment of the utility model;

[0023] Figure 7 A schematic diagram of the three-dimensional structure of the lower wedge block provided in a specific embodiment of the utility model;

[0024] Figure 8 A schematic diagram of the three-dimensional structure of an upper wedge block provided in a specific embodiment of the utility model;

[0025] Fig. 9It is a cross-sectional schematic diagram of the upper wedge block provided in a specific embodiment of the utility model.

[0026] Main component symbols:

[0027] 100, large fixed plate; 110, sliding seat; 111, lower slider; 1111, fourth inclined surface; 112, upper slider; 1121, movable block; 1122, rotating pin; 1123, third inclined surface; 113, first elastic member; 114, second elastic member; 115, through groove; 120, upper wedge block; 121, first inclined surface; 122, second shaft hole; 123, third shaft hole; 130, lower wedge block; 131, second inclined surface; 132, shaft Bearing position; 133, first axial hole; 140, small fixed plate; 200, bearing seat; 300, pull rod; 310, fixing piece; 320, third elastic piece; 330, second bearing; 340, power device; 400, shaft; 401, shaft shoulder; 402, cross guide groove; 410, pressure block; 411, lower ring; 412, cross guide block; 413, upper disc; 414, fourth axial hole; 420, first bearing; 430, third bearing. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 1 to 9 As shown, the utility model provides a rim positioning device, comprising: a large fixed disk 100, a slide seat 110, an upper slider 112, a lower slider 111 and a driving mechanism, the large fixed disk 100 is provided with a slide seat 110, the upper slider 112 and the lower slider 111 are both movably connected to the slide seat 110, one end of the upper slider 112 and the lower slider 111 are close to the middle of the large fixed disk 100, and the other end is toward the inner wall of the rim, the upper slider 112 and the lower slider 111 move in a direction close to or away from the middle of the large fixed disk 100, the upper slider 112 and the lower slider 111 are distributed along the circumference, and the driving mechanism is used to drive the slider to move on the slide seat 110.

[0030] In this embodiment, the large fixed disk 100 is in the shape of a disk, and six slide seats 110 are evenly distributed along the circumference of the disk. The slide seats 110 are provided with upper guide holes and lower guide holes arranged horizontally, and the upper guide hole is arranged above the lower guide hole. The upper slider 112 is movably installed in the upper guide hole, and the lower slider 111 is movably installed in the lower guide hole. One end of the upper slider 112 and the lower slider 111 points to the rim and fits with the inner ring of the rim. The cross-sectional curve of the end of the lower slider 111 matches the cross-sectional curve of the rim, so as to obtain a better positioning effect.

[0031] A movable block 1121 is provided at one end of the upper slider 112 close to the rim. A vertically arranged shaft hole is provided on the upper slider 112 and the movable block 1121. A rotating pin 1122 is provided in the shaft hole. The movable block 1121 rotates around the rotating pin 1122. In this embodiment, a convex strip is provided at the end of the upper slider 112. The shaft hole is provided on the convex strip. A groove is provided on the side of the movable block 1121. The shaft hole is provided on the two side walls of the groove. The groove matches the convex strip. Due to production errors, the side of the rim may not be a standard arc surface. The movable block 1121 is provided as a rotatable structure, which can make it fit the side of the rim more closely, making the clamping more reliable and the positioning more precise.

[0032] The driving mechanism includes an upper wedge block 120, a lower wedge block 130, a pull rod 300, a power device 340, a shaft 400, a pressure block 410 and a slider reset device. The middle part of the large fixed disk 100 is provided with a pull rod 300 that moves in the vertical direction. The pull rod 300 is driven by the power device 340. The shaft 400 is a hollow structure and is sleeved on the outside of the pull rod 300. The middle part of the lower wedge block 130 is provided with a first shaft hole 133. The bottom of the upper wedge block 120 is oriented to the left. A second shaft hole 122 is opened on the top, and a third shaft hole 123 penetrating the upper wedge block 120 is opened upward on the top of the second shaft hole 122. The shaft 400 is rotatably connected with the first shaft hole 133 and the second shaft hole 122; a cross guide groove 402 is opened from top to bottom on the top of the shaft 400, and the pressing block 410 is composed of a cross guide block 412, an upper disc 413 and a lower ring 411. The upper disc 413 is fixedly arranged on the top of the cross guide block 412. The cross guide groove 402 is opened on the top of the shaft 400 from top to bottom. The pressing block 410 is composed of a cross guide block 412, an upper disc 413 and a lower ring 411. The upper disc 413 is fixedly arranged on the top of the cross guide block 412. The bottom of the guide block 412 extends to the inner ring of the lower ring 411 and is fixedly connected to the lower ring 411. A fourth axial hole 414 is opened through the middle of the pressure block 410, and the pull rod 300 passes through the fourth axial hole 414. The upper disk 413 of the pressure block 410 is arranged in the second axial hole 122 and is fixedly connected to the pull rod 300. The cross guide groove 402 cooperates with the cross guide block 412. After the pressure block 410 is installed, the lower ring 411 is located at the bottom of the upper wedge block 120, and the diameter of the lower ring 411 is larger than the diameter of the second axial hole 122. In this embodiment, the fourth axial hole 414 is a stepped hole, and its diameter at the lower ring 411 and the cross guide block 412 is larger than the diameter at the upper disk 413, that is, a structure with a larger bottom and a smaller top. A mounting position corresponding to the opening at the upper disk 413 is opened on the pull rod 300, and the pull rod 300 is threaded and provided with a nut above the mounting position. When the pressing block 410 is installed on the corresponding installation position on the pull rod 300, the locking nut is tightened to fix the pressing block 410 on the pull rod 300, so that the pressing block 410 moves with the up and down movement of the pull rod 300. Since the diameter of the bottom of the pressing block 410, that is, the lower ring 411, is larger than the second shaft hole 122, the lower ring 411 will drag the upper wedge block 120 upward during the upward movement of the pressing block 410. In addition, since the cross guide block 412 cooperates with the cross guide groove 402, the pressing block 410 will move along the axial direction of the shaft 400 with high precision, avoiding the upper wedge block 120 from deviating during the movement and causing the positioning accuracy to decrease.

[0033] The upper wedge block 120 abuts against the end of the upper slider 112, and the lower wedge block 130 abuts against the end of the lower slider 111. An inclined first slope 121 is provided at the abutment between the upper wedge block 120 and the upper slider 112, and an inclined second slope 131 is provided at the abutment between the lower wedge block 130 and the lower slider 111. When the pull rod 300 moves downward, the upper wedge block 120 and the lower wedge block 130 are driven to move downward, thereby driving the upper slider 112 and the lower slider 111 to move away from the pull rod 300. In this embodiment, a third slope 1123 that fits with the first slope 121 is provided at one end of the upper slider 112 close to the pull rod 300, and a fourth slope 1111 that fits with the second slope 131 is provided at one end of the lower slider 111 close to the pull rod 300.

[0034] Since there are six upper sliders 112 and six lower sliders 111, the upper wedge block 120 and the lower wedge block 130 must each have six contact surfaces. The contact portion of the upper wedge block 120 and the upper slider 112 is in the shape of a hexagonal pyramid, and the contact portion of the lower wedge block 130 and the lower slider 111 is in the shape of a hexagonal pyramid.

[0035] The slider reset device includes a first elastic member 113 and a second elastic member 114. Both sides of the upper guide hole and the lower guide hole are provided with a through groove 115 connected to the outside. One end of the first elastic member 113 is fixed to the side wall of the slide 110 close to the end of the pull rod 300, and the other end is installed on the upper slider 112 through the through groove 115. One end of the second elastic member 114 is fixed to the side wall of the slide 110 close to the end of the pull rod 300, and the other end is installed on the lower slider 111 through the through groove 115. When the upper slider 112 and the lower slider 111 move in the direction away from the pull rod 300, the first elastic member 113 and the second elastic member 114 are pulled. In this embodiment, the first elastic member 113 and the second elastic member 114 are both The power device 340 is a tension spring, and the cylinder is vertically arranged at the bottom of the bearing seat 200. The cylinder piston rod moves in the vertical direction, driving the pull rod 300 to move in the vertical direction. When the pull rod 300 moves downward, it drives the upper wedge block 120 and the lower wedge block 130 to move downward. During the downward movement of the upper wedge block 120, under the interaction of the first inclined surface 121 and the third inclined surface 1123, the upper slider 112 moves away from the pull rod 300. At this time, the first elastic member 113 is pulled. During the downward movement of the lower wedge block 130, under the interaction of the second inclined surface 131 and the fourth inclined surface 1111, the lower slider 111 moves away from the pull rod 300. At this time, the second elastic member 114 is also pulled. When the pull rod 300 moves upward, it drives the pressure block 410 to move upward, and the pressure block 410 drives the upper wedge block 120 to move upward. At this time, under the action of the rebound force of the first elastic member 113, the upper slider 112 moves toward the direction close to the pull rod 300, and the lower wedge block 130 is no longer under the pressure from the upper wedge block 120. Under the action of the rebound force of the second elastic member 114, the lower slider 111 moves toward the direction close to the pull rod 300, so that the lower wedge block 130 is squeezed by the lower slider 111 and moves upward.

[0036] A third elastic member 320 is installed on the top of the upper wedge block 120, and a fixing member 310 for fixing the third elastic member 320 is provided on the pull rod 300. When the pull rod 300 moves downward, the third elastic member 320 is compressed. In this embodiment, the third elastic member 320 is a spring, and the fixing member 310 is a nut, which is threadedly connected to the pull rod 300. When the pull rod 300 moves downward, the fixing member 310 and the third elastic member 320 are driven to move downward, thereby driving the upper wedge block 120 to move downward. When the upper wedge block 120 moves downward, the upper slider 112 is driven to move away from the pull rod 300 until it abuts against the side of the rim. If the pull rod 300 continues to move downward at this time, the third elastic member 320 is compressed, and the upper wedge block 120 no longer moves. The movement of the lower wedge block 130 is driven by the pressing block 410. When the pull rod 300 moves downward, the pressing block 410 is also driven downward. The lower ring 411 of the pressing block 410 abuts against the top of the lower wedge block 130, driving the lower wedge block 130 to move downward. The downward movement of the lower wedge block 130 drives the lower slider 111 to move away from the pull rod 300 until it abuts against the side of the rim. The upper slider 112 and the lower slider 111 abut against the side of the rim to achieve the clamping and positioning of the rim.

[0037] The small fixed plate 140 is installed at the bottom of the large fixed plate 100, and the bearing seat 200 is arranged at the bottom of the small fixed plate 140; the first bearings 420 are fixedly installed at both ends of the bearing seat 200, and the two first bearings 420 are matched with the shaft 400. A shaft shoulder 401 is arranged in the middle of the shaft 400, and the top of the shaft shoulder 401 is fixedly connected to the small fixed plate 140, and the bottom of the shaft shoulder 401 abuts against the first bearing 420 on the bearing seat 200. A second bearing 330 is also arranged between the upper wedge block 120 and the third elastic member 320, and the lower wedge block 130 is provided with a second bearing 330. A bearing position 132 is provided at the top, and a third bearing 430 is installed in the bearing position 132. The bearing position 132 is sealed by a pressure block 410, and the shaft cooperates with the third bearing 430. In this embodiment, after the rim is installed, the rim is moved, which will drive the large fixed plate 100 and the small fixed plate 140 to rotate, thereby driving the shaft 400 to rotate, and the large fixed plate 100 drives the slide seat 110, the upper slide rod and the lower slide rod to rotate, and the upper slide rod and the lower slide rod drive the upper wedge block 120 and the lower wedge block 130 to rotate, so that the utility model can be used for the concentricity measurement of the rim.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A rim positioning device, characterized in that: include: A large fixed disk (100), a slide seat (110), an upper slider (112), a lower slider (111) and a driving mechanism, wherein the large fixed disk (100) is provided with a slide seat (110), the upper slider (112) and the lower slider (111) are both movably connected to the slide seat (110), one end of the upper slider (112) and the lower slider (111) are close to the middle of the large fixed disk (100), and the other end faces the inner wall of the rim, the upper slider (112) and the lower slider (111) move in a direction approaching or moving away from the middle of the large fixed disk (100), the upper slider (112) and the lower slider (111) are distributed along a circumference, and the driving mechanism is used to drive the slider to move on the slide seat (110).

2. A rim positioning device according to claim 1, characterized in that: The slide seat (110) is provided with an upper guide hole and a lower guide hole which are arranged horizontally, the upper guide hole is arranged above the lower guide hole, the upper slider (112) is movably mounted in the upper guide hole, and the lower slider (111) is movably mounted in the lower guide hole.

3. A rim positioning device according to claim 2, characterized in that: Six slide seats (110) are evenly distributed along the circumference of the large fixed disk (100); a movable block (1121) is provided at one end of the upper slide block (112) close to the wheel rim; a vertically arranged shaft hole is provided on the upper slide block (112) and the movable block (1121); a rotating pin (1122) is provided in the shaft hole; and the movable block (1121) rotates around the rotating pin (1122).

4. A rim positioning device according to claim 3, characterized in that: The driving mechanism comprises an upper wedge block (120), a lower wedge block (130), a pull rod (300), a power device (340), a shaft (400), a pressure block (410) and a slider resetting device. A pull rod (300) that moves along a vertical direction is arranged in the middle of the large fixed disk (100), and the pull rod (300) is driven by the power device (340); The shaft (400) is a hollow structure and is sleeved on the outside of the pull rod (300). A first shaft hole (133) is formed through the middle of the lower wedge block (130). A second shaft hole (122) is formed upward at the bottom of the upper wedge block (120). A third shaft hole (123) is formed upward at the top of the second shaft hole (122) and passes through the upper wedge block (120). The shaft (400) is rotatably connected to the first shaft hole (133) and the second shaft hole (122). The top of the shaft (400) is provided with a cross guide groove (402) from top to bottom. The pressing block (410) is composed of a cross guide block (412), an upper disc (413) and a lower ring (411). The upper disc (413) is fixedly arranged on the top of the cross guide block (412). The bottom of the cross guide block (412) extends to the inner ring of the lower ring (411) and is fixedly connected to the lower ring (411). A fourth shaft is provided through the middle of the pressing block (410). The pull rod (300) passes through the fourth axial hole (414), the upper disk (413) of the pressure block (410) is arranged in the second axial hole (122) and is fixedly connected to the pull rod (300), the cross guide groove (402) cooperates with the cross guide block (412), and after the pressure block (410) is installed, the lower ring (411) is located at the bottom of the upper wedge block (120), and the diameter of the lower ring (411) is greater than the diameter of the second axial hole (122); The upper wedge block (120) is in contact with the end of the upper slider (112), and the lower wedge block (130) is in contact with the end of the lower slider (111). A first inclined surface (121) is provided at the contact point between the upper wedge block (120) and the upper slider (112), and a second inclined surface (131) is provided at the contact point between the lower wedge block (130) and the lower slider (111). When the pull rod (300) moves downward, the upper wedge block (120) and the lower wedge block (130) are driven to move downward, thereby driving the upper slider (112) and the lower slider (111) to move in a direction away from the pull rod (300).

5. A rim positioning device according to claim 4, characterized in that: The end of the upper slider (112) close to the pull rod (300) is provided with a third inclined surface (1123) that fits with the first inclined surface (121), and the end of the lower slider (111) close to the pull rod (300) is provided with a fourth inclined surface (1111) that fits with the second inclined surface (131).

6. A rim positioning device according to claim 5, characterized in that: The shape of the contact portion between the upper wedge block (120) and the upper slider (112) is a hexagonal pyramid, and the shape of the contact portion between the lower wedge block (130) and the lower slider (111) is a hexagonal pyramid.

7. A rim positioning device according to claim 6, characterized in that: A third elastic member (320) is installed on the top of the upper wedge block (120), and a fixing member (310) for fixing the third elastic member (320) is provided on the pull rod (300). When the pull rod (300) moves downward, the third elastic member (320) is compressed.

8. A rim positioning device according to claim 7, characterized in that: The power device (340) is a cylinder, and the slider reset device includes a first elastic member (113) and a second elastic member (114). Both sides of the upper guide hole and the lower guide hole are provided with through grooves (115) connected to the outside. One end of the first elastic member (113) is fixed to one end of the side wall of the slide seat (110) close to the pull rod (300), and the other end is installed on the upper slider (112) through the through groove (115). One end of the second elastic member (114) is fixed to one end of the side wall of the slide seat (110) close to the pull rod (300), and the other end is installed on the lower slider (111) through the through groove (115). When the upper slider (112) and the lower slider (111) move in a direction away from the pull rod (300), the first elastic member (113) and the second elastic member (114) are pulled.

9. A rim positioning device according to claim 8, characterized in that: The invention also comprises a bearing seat (200) and a small fixed plate (140), wherein the small fixed plate (140) is mounted on the bottom of the large fixed plate (100), the bearing seat (200) is arranged on the bottom of the small fixed plate (140), and the cylinder is installed on the bottom of the bearing seat (200); first bearings (420) are fixedly mounted on both ends of the bearing seat (200), and both first bearings (420) are matched with the shaft (400); a shaft shoulder (401) is arranged in the middle of the shaft (400), the top of the shaft shoulder (401) is fixedly connected to the small fixed plate (140), and the bottom of the shaft shoulder (401) is abutted against the first bearing (420) on the bearing seat (200); and a second bearing (330) is arranged between the upper wedge block (120) and the third elastic member (320).

10. A rim positioning device according to claim 9, characterized in that: A bearing seat (132) is provided at the top of the lower wedge block (130), a third bearing (430) is installed in the bearing seat (132), the bearing seat (132) is sealed by a pressing block (410), and the shaft (400) cooperates with the third bearing (430).

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