A dynamic balancing machine for detecting dynamic balance of wheels

Abstract

The present application relates to a dynamic balancing machine for detecting the dynamic balance of a wheel, which includes a mounting body, a rotating tube rotatably connected to the mounting body, an expansion sleeve fixture structure for fixing the wheel arranged at the top of the rotating tube, a driving system arranged at the bottom of the rotating tube for driving the expansion sleeve fixture structure to expand to clamp the wheel, and a driving mechanism arranged on the side of the mounting body away from the rotating tube for driving the expansion sleeve fixture structure to rotate; the expansion sleeve fixture structure includes a tray assembly, a vertical moving assembly, an inner expansion sleeve assembly and an outer expansion sleeve assembly, the tray assembly is arranged at the top of the rotating tube, the vertical moving assembly is arranged on the tray assembly, the inner expansion sleeve assembly is sleeved on the vertical moving assembly, the outer expansion sleeve assembly is sleeved on the inner expansion sleeve assembly, and the vertical moving assembly slides toward one side of the tray assembly to squeeze the inner expansion sleeve assembly to expand outwards and then drive the outer expansion sleeve assembly to expand outwards to clamp the wheel. The present application has the effect of improving the wheel fixing efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of dynamic balancing machines, and in particular to a dynamic balancing machine for detecting the dynamic balance of a wheel. Background Art

[0002] With the rapid development of society, the number of cars is increasing. Tires are an indispensable and important part of cars. Tire assemblies are rotating parts. Rotating parts are manufactured with imbalances and will vibrate during use. Therefore, before tire assembly, the tire needs to be dynamically balanced, and a dynamic balancing machine is required for tire testing.

[0003] In related technologies, such as Figure 1 A horizontal wheel dynamic balancing machine shown in the figure includes a frame 10, a driving system 11, a connecting shaft 12, a retaining ring 13 and a fixing bolt 14. The driving system 11 is fixed to the frame 10 by bolts. The driving system 11 is a driving motor. The motor shaft of the driving motor is coaxially welded and fixed to the connecting shaft 12. The retaining ring 13 is fixed to the connecting shaft 12 by welding sleeve. The fixing bolt 14 is fixedly connected to the connecting shaft 12 at one end away from the driving motor by threaded fixing. A wheel is clamped between the retaining ring 13 and the fixing bolt 14. When installing and fixing the wheel, the fixing bolt 14 needs to be tightened on the connecting shaft 12 by threaded fitting.

[0004] With respect to the above-mentioned related technologies, the inventor believes that the horizontal wheel balancing machine has the defect of low efficiency in fixing the wheel. Summary of the invention

[0005] In order to improve the wheel fixing efficiency, the present application provides a dynamic balancing machine for detecting the dynamic balance amount of the wheel.

[0006] The present application provides a dynamic balancing machine for detecting the dynamic balance of a wheel, which adopts the following technical solution:

[0007] A dynamic balancing machine for detecting the dynamic balance of a wheel comprises a mounting body, a rotating tube is rotatably connected to the mounting body, an expansion sleeve clamp structure for fixing the wheel is arranged at the top of the rotating tube, a driving system is arranged at the bottom of the rotating tube for driving the expansion sleeve clamp structure to expand so as to clamp the wheel, a driving mechanism is arranged on the side of the mounting body away from the rotating tube for driving the expansion sleeve clamp structure to rotate; the expansion sleeve clamp structure comprises a tray assembly, a vertical moving assembly, an inner expansion sleeve assembly and an outer expansion sleeve assembly, the tray assembly is arranged at the top of the rotating tube, the vertical moving assembly is arranged on the tray assembly, the inner expansion sleeve assembly is sleeved on the vertical moving assembly, the outer expansion sleeve assembly is sleeved on the inner expansion sleeve assembly, the vertical moving assembly slides toward one side of the tray assembly to squeeze the inner expansion sleeve assembly to expand outward and then drive the outer expansion sleeve assembly to expand outward to clamp the wheel.

[0008] By adopting the above technical scheme, the installation body provides installation points for the rotating tube and the driving mechanism, the driving mechanism drives the rotating tube to rotate, the rotation of the rotating tube drives the expansion sleeve clamp structure to rotate, and the rotation of the expansion sleeve clamp structure drives the wheel to rotate; when fixing the wheel, the wheel is placed on the outer expansion sleeve assembly, and the driving system drives the vertical moving assembly to move toward one side of the tray assembly, the downward movement of the vertical moving assembly squeezes the inner expansion sleeve assembly to expand outward, and the outward expansion movement of the inner expansion sleeve assembly squeezes the outer expansion sleeve assembly to expand, so as to increase the diameter of the outer expansion sleeve assembly, thereby achieving the effect of fixing the wheel and improving the wheel fixing efficiency.

[0009] Preferably, the tray assembly comprises a tray and a lower cone, the tray is fixed to the top of the rotating tube, and the lower cone is fixed to the top of the tray;

[0010] The vertical moving assembly comprises a hollow cylinder, an upper cone and an inner top plate, wherein the upper cone is arranged at the top of the hollow cylinder, the inner top plate is sleeved on a side of the hollow cylinder close to the upper cone, and the hollow cylinder is slidably connected in the lower cone;

[0011] The internal expansion sleeve assembly includes an internal expansion sleeve, the inner top surface of the internal expansion sleeve is provided with a first matching conical surface, the inner bottom surface of the internal expansion sleeve is provided with a second matching conical surface, the internal expansion sleeve is arranged on the lower cone, the first matching conical surface is in contact with the upper cone, and the second matching conical surface is in contact with the lower cone. When the upper cone moves toward one side of the tray, the cross-section of the upper cone and the internal expansion sleeve gradually increases, thereby driving the internal expansion sleeve to expand outward.

[0012] By adopting the above technical solution, the upper cone moves toward one side of the pallet driven by the driving system. When the upper cone moves toward one side of the pallet, the cross-section formed by the upper cone and the inner expansion sleeve gradually increases. As the cross-section formed by the upper cone and the inner expansion sleeve increases, the inner expansion sleeve performs an outward expansion movement.

[0013] Preferably, the vertical moving assembly further comprises a top cover, and the top cover is arranged at the top end of the upper cone;

[0014] A first limiting groove is formed at the top end of the internal expansion sleeve, and the top cover is fitted in the first limiting groove to limit the descending height of the upper cone of the internal expansion sleeve.

[0015] By adopting the above technical solution, as the upper cone moves downward, the top cover is driven to move downward. When the top cover is tightly pressed against the bottom end of the first limiting groove, the top cover stops moving, the upper cone stops moving downward, and the inner expansion sleeve stops expanding outward.

[0016] Preferably, a second limiting groove for limiting the outward expansion range of the inner expansion sleeve is provided on the tray near the outer periphery of the lower cone.

[0017] By adopting the above technical solution, during the outward expansion of the inner expansion sleeve, the second limiting groove is used to limit the outward expansion range of the inner expansion sleeve, thereby preventing the inner expansion sleeve from expanding beyond its elastic limit and increasing the service life of the inner expansion sleeve.

[0018] Preferably, a plurality of first expansion grooves are provided in the height direction of the internal expansion sleeve to provide space for its expansion, and the first expansion grooves are provided in an interval manner from the top end of the internal expansion sleeve to the bottom end of the internal expansion sleeve or from the bottom end of the internal expansion sleeve to the top end of the internal expansion sleeve.

[0019] By adopting the above technical solution, the first expansion groove provides an expansion space for the inner expansion sleeve to expand outward, and the first expansion grooves are arranged at different intervals in the opening direction, so that the inner expansion sleeve has a certain continuity.

[0020] Preferably, a plurality of mounting holes are provided on the side wall of the inner expansion sleeve, the mounting holes are provided along the height direction, and the inner expansion sleeve is limited to the periphery of the lower cone by passing bolts through the mounting holes;

[0021] A slide groove is provided on the outer wall of the hollow cylinder, and a slider is provided on the inner wall of the lower cone. The slider is matched in the slide groove to achieve synchronization of the rotation speeds of the hollow cylinder and the lower cone.

[0022] By adopting the above technical solution, the different directions of the opening of the mounting holes provide mounting points for the bolts, and ensure that the internal expansion sleeve can move up and down and expand outward, and at the same time the bolt can transmit the torque of the lower cone to the internal expansion sleeve; the cooperation between the slide groove and the slider, on the one hand, enables the hollow cylinder to slide along the opening direction of the slide groove, and on the other hand, the hollow cylinder transmits the rotational torque to the lower cone.

[0023] Preferably, the external expansion sleeve assembly includes a first external expansion sleeve and a second external expansion sleeve, the first external expansion sleeve is fixed on the tray assembly, the second external expansion sleeve is arranged on the first external expansion sleeve, the inner rings of the first and second external expansion sleeves are fitted with the outer ring of the inner expansion sleeve, and the outer diameter of the first external expansion sleeve is greater than the outer diameter of the second external expansion sleeve.

[0024] By adopting the above technical solution, the outward expansion movement of the inner expansion sleeve squeezes the first outer expansion sleeve and the second outer expansion sleeve to expand outward, so that the outer diameters of the first outer expansion sleeve and the second outer expansion sleeve increase, the first outer expansion sleeve is adapted to the wheel with a larger inner diameter, and the second outer expansion sleeve is adapted to the wheel with a smaller inner diameter, thereby achieving the purpose of fixing the wheel.

[0025] Preferably, an outer ring of the tray away from the lower cone is provided with a third limiting groove for limiting the outward expansion range of the first external expansion sleeve.

[0026] By adopting the above technical solution, the third limiting groove is used to limit the expansion range of the first expansion sleeve, thereby preventing the first expansion sleeve from expanding beyond its elastic limit and improving the service life of the first expansion sleeve.

[0027] Preferably, the first expansion sleeve comprises a first expansion sleeve A and a first expansion sleeve B, the first expansion sleeve A is integrally formed at the top of the first expansion sleeve B, and the outer diameter of the first expansion sleeve A is smaller than the outer diameter of the first expansion sleeve B.

[0028] By adopting the above technical solution, the first expansion sleeve A and the first expansion sleeve B are connected in one piece, so that the first expansion sleeve A and the first expansion sleeve B can shrink and expand at the same time. The first expansion sleeve A is used to fix the wheel with a smaller inner diameter, and the first expansion sleeve B is used to fix the wheel with a larger inner diameter, thereby improving the adaptability to wheels with different inner diameters and thus improving the fixing efficiency.

[0029] Preferably, the first external expansion sleeve A and the first external expansion sleeve B are provided with a plurality of second expansion grooves to leave space for the expansion of the first external expansion sleeve A and the first external expansion sleeve B, and one end of the second expansion groove starts from the top of the first external expansion sleeve A and ends at the bottom of the first external expansion sleeve B or starts from the bottom of the first external expansion sleeve B and ends at the top of the first external expansion sleeve A, and is arranged in two ways.

[0030] By adopting the above technical solution, the second expansion groove provides expansion space for the first expansion sleeve A and the first expansion sleeve B to expand outward, thereby increasing the expansion range of the first expansion sleeve A and the first expansion sleeve B. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the related technology.

[0032] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application. Figure 1 .

[0033] Figure 3 The explosion of the expansion sleeve fixture structure in the embodiment of the present application Figure 1 , mainly used to display tray components, vertical movement components, internal expansion sleeve components and external expansion sleeve components.

[0034] Figure 4 The explosion of the expansion sleeve fixture structure in the embodiment of the present application Figure 2 , mainly used to show the structure of the chute and slider.

[0035] Figure 5 It is a schematic diagram of the structure of the internal expansion sleeve assembly in the embodiment of the present application.

[0036] Figure 6 It is a structural schematic diagram of the tray, inner expansion sleeve and top cover of the expansion sleeve clamp structure in the implementation of the present application.

[0037] Figure 7 It is a cross-sectional schematic diagram of the expansion sleeve clamp structure in the embodiment of the present application.

[0038] Figure 8It is a schematic diagram of the structure of the drive system in the embodiment of the present application.

[0039] Fig. 9 This is a schematic diagram of the structure of the embodiment of the present application. Figure 2 , mainly used to display the structural diagram of the driving mechanism.

[0040] Description of the accompanying drawings: 1. Installation body; 2. Rotating tube; 3. Driving mechanism; 31. Driving motor; 32. Driving wheel; 33. Driven wheel; 4. Driving system; 41. Cylinder; 42. Piston rod; 5. Tray assembly; 51. Tray; 511. Second limiting groove; 512. Third limiting groove; 52. Lower cone; 521. Sliding block; 53. Fixing hole; 6. Vertical moving assembly; 61. Hollow cylinder; 611. Sliding groove; 62. Upper cone; 63. Inner top plate; 64. Top cover; 7. Inner expansion sleeve assembly; 71. Inner expansion sleeve; 711. First limiting groove; 712. First expansion groove; 72. First matching cone surface; 73. Second matching cone surface; 74. Mounting hole; 8. External expansion sleeve assembly; 81. First external expansion sleeve; 811. First external expansion sleeve A; 812. First external expansion sleeve B; 813. Second expansion groove; 82. Second external expansion sleeve; 10. Frame; 11. Driving system; 12. Coupling; 13. Snap ring; 14. Fixing bolt. DETAILED DESCRIPTION

[0041] The following is combined with Figure 2-9 This application is described in further detail.

[0042] The present application embodiment discloses a dynamic balancing machine for detecting the dynamic balance of a wheel. Figure 2 The dynamic balancing machine includes a mounting body 1, on which a rotating tube 2 is rotatably connected via a bearing. The rotating tube 2 is a hollow cylinder. A driving mechanism 3 is fixedly connected via bolts on the side wall of the mounting body 1 away from the rotating tube 2. An expansion sleeve fixture structure is fixedly connected to the top of the rotating tube 2 via bolts. A wheel is placed on the expansion sleeve fixture structure. The wheel is mounted on the expansion sleeve fixture structure via a center hole. A driving system 4 is fixedly connected to the bottom of the rotating tube 2 via bolts. The driving system 4 drives the expansion sleeve fixture structure to expand outward to clamp the wheel. The driving mechanism 3 drives the rotating tube 2 to rotate. The rotation of the rotating tube 2 drives the expansion sleeve fixture structure to rotate.

[0043] Reference Figure 3The expansion sleeve fixture structure includes a tray assembly 5, which includes a tray 51 and a lower cone 52. The tray 51 is fixed to the top of the rotating tube 2 by bolts. The tray 51 is annular. The lower cone 52 is fixed to the middle position of the tray 51 by welding. The lower cone 52 is a hollow frustum, that is, the cross-sectional area of ​​the top surface of the lower cone 52 is smaller than the cross-sectional area of ​​the bottom surface of the lower cone 52, and the tray 51 is coaxial with the lower cone 52. The inner diameter of the tray 51 is the same as the inner diameter of the lower cone 52, and a plurality of fixing holes 53 are opened on the outer periphery of the lower cone 52.

[0044] Reference Figure 3 and Figure 4 The expansion sleeve fixture structure also includes a vertical moving component 6, which includes a hollow cylinder 61, an upper cone 62, an inner top plate 63 and a top cover 64. The hollow cylinder 61 is a hollow cylinder, and the outer diameter of the hollow cylinder 61 is smaller than the inner diameter of the hollow lower cone 52. The upper cone 62 is an inverted hollow cone, that is, the cross-sectional area of ​​the top end of the upper cone 62 is larger than the cross-sectional area of ​​the bottom end of the upper cone 62. The inner top plate 63 is an annular ring, and the top cover 64 is a disc-shaped, and the diameter of the top cover 64 is larger than the diameter of the top end of the upper cone 62. The hollow cylinder 61 is slidably connected in the lower cone 52, and the inner top plate 63 is sleeved and fixed on the hollow cylinder 61 near the side of the upper cone 62, and the inner top plate 63 is fixed to the bottom surface of the upper cone 62 by bolts. The upper cone 62 is welded to the top of the hollow cylinder 61, and the top cover 64 is fixed to the top of the upper cone 62 by bolts.

[0045] Reference Figure 5 and Figure 6 The expansion sleeve fixture structure also includes an internal expansion sleeve assembly 7, which includes an internal expansion sleeve 71. The internal expansion sleeve 71 is made of spring steel. Spring steel refers to a special alloy steel for manufacturing various springs and other elastic elements, and has good elasticity. The inner top surface of the internal expansion sleeve 71 is provided with a first matching cone surface 72, and the first matching cone surface 72 gradually tilts from high to low toward the center of the internal expansion sleeve 71. The inner bottom surface of the internal expansion sleeve 71 is provided with a second matching cone surface 73, and the second matching cone surface 73 gradually tilts from low to high toward the center of the internal expansion sleeve 71. A plurality of mounting holes 74 are provided on the side wall of the internal expansion sleeve 71, and the mounting holes 74 are provided along the height direction of the internal expansion sleeve 71. The internal expansion sleeve 71 is connected to the fixing hole 53 by passing the mounting holes 74 with bolts, and the bolts are located in the mounting holes 74, so that the internal expansion sleeve 71 can move up and down and expand or tighten relative to the lower cone 52. The first matching cone surface 72 fits with the upper cone 62, and the second matching cone surface 73 fits with the lower cone 52. Figure 7 When the upper cone 62 moves toward the lower cone 52, the cross section formed by the upper cone 62 and the first matching cone surface 72 is continuously increased, driving the inner expansion sleeve 71 to move downward and expand outward.

[0046] Reference Figure 5 and Figure 7A first limiting groove 711 is provided at the top of the inner expansion sleeve 71. The first limiting groove 711 is in the shape of a circular ring. The top cover 64 is abutted and fitted in the first limiting groove 711 to limit the downward height of the inner upper cone 62. When the top cover 64 abuts against the bottom of the first limiting groove 711, the vertical moving component 6 stops moving downward, and the inner expansion sleeve 71 stops expanding outward.

[0047] Reference Figure 5 A plurality of first expansion grooves 712 are opened in the height direction of the inner expansion sleeve 71 to provide space for its expansion, and the opening direction of the first expansion grooves 712 is from the bottom end of the inner expansion sleeve 71 to the top of the inner expansion sleeve 71 or from the top of the inner expansion sleeve 71 to the bottom of the inner expansion sleeve 71, and the two opening directions are arranged at intervals, so that the inner expansion sleeve 71 has continuity.

[0048] Reference Figure 6 A second limiting groove 511 is provided on the tray 51 near the outer periphery of the lower cone 52 to limit the outward expansion range of the inner expansion sleeve 71. The second limiting groove 511 is a circular groove. When the inner expansion sleeve 71 expands outward to fit the inner wall of the outer ring of the second limiting groove 511, the inner expansion sleeve 7 stops expanding outward.

[0049] Reference Figure 4 A slide groove 611 is provided on the outer wall of the hollow cylinder 61, and the opening direction of the slide groove 611 extends along the axial direction of the hollow cylinder 61. A slider 521 is integrally connected to the inner wall of the lower cone 52. The slider 521 is a rectangular block. The slider 521 is loosely fitted in the slide groove 611. When the hollow cylinder 61 moves away from or close to the side of the tray 51, the slider 521 slides along the opening direction of the slide groove 611. When the lower cone 52 rotates driven by the driving motor 31, the slider 521 and the slide groove 611 cooperate to transmit torque to each other, so that the hollow cylinder 61 and the tray 51 rotate synchronously.

[0050] Reference Figure 3 The expansion sleeve fixture structure also includes an external expansion sleeve assembly 8, which is made of spring steel. The external expansion sleeve assembly 8 includes a first external expansion sleeve 81 and a second external expansion sleeve 82. The first external expansion sleeve 81 is limited on the tray assembly 5 by bolts, and the second external expansion sleeve 82 is fixed to the first external expansion sleeve 81 by bolts. The inner rings of the first external expansion sleeve 81 and the second external expansion sleeve 82 are fitted with the outer ring of the inner expansion sleeve 71. The outer diameter of the first external expansion sleeve 81 is larger than the outer diameter of the second external expansion sleeve 82. According to wheels with different inner diameters, the wheels are placed on the first external expansion sleeve 81 or the second external expansion sleeve 82.

[0051] Reference Figure 3A third limiting groove 512 is provided on the outer ring of the tray 51 away from the lower cone 52 to limit the expansion range of the first external expansion sleeve 81. The third limiting groove 512 is formed by sinking downward. The first external expansion sleeve 81 is located in the third limiting groove 512. The third limiting groove 512 is a circular groove to prevent the first external expansion sleeve 81 from expanding beyond its elastic limit, so that the first external expansion sleeve 81 and the second external expansion sleeve 82 have a longer service life.

[0052] Reference Figure 3 The first external expansion sleeve 81 includes a first external expansion sleeve A811 and a first external expansion sleeve B812. The first external expansion sleeve A811 is integrally connected to the top of the first external expansion sleeve B812. The outer diameter of the first external expansion sleeve A811 is smaller than the outer diameter of the first external expansion sleeve B812. The bolt passes through the first external expansion sleeve B812 and is connected to the tray 51.

[0053] Reference Figure 3 A plurality of second expansion grooves 813 are provided on the first external expansion sleeve A811 and the first external expansion sleeve B812 to leave space for the expansion of the first external expansion sleeve A811 and the first external expansion sleeve B812. The second expansion grooves 813 are opened from the top of the first external expansion sleeve A811 to the bottom of the first external expansion sleeve B812 or from the bottom of the first external expansion sleeve B812 to the top of the first external expansion sleeve A811, and the two opening methods are arranged at intervals.

[0054] Reference Figure 8 and Fig. 9 The driving system 4 includes a cylinder 41 and a piston rod 42. The cylinder 41 is fixed to the bottom end of the rotating tube 2 by bolts. One end of the piston rod 42 is arranged in the cylinder 41, and the other end of the piston rod 42 passes through the rotating tube 2 and is fixed to the hollow cylinder 61 by welding.

[0055] Reference Figure 2 and Figure 7 First, the cylinder 41 drives the piston rod 42 to perform telescopic movement. The contraction movement of the piston rod 42 drives the top cover 64 to move toward the side of the tray 51. The downward movement of the top cover 64 drives the upper cone 62 and the inner top plate 63 to move downward. The downward movement of the upper cone 62 and the inner top plate 63 squeezes the inner expansion sleeve 71, causing the inner expansion sleeve 71 to expand outward. The outward expansion of the inner expansion sleeve 71 squeezes the first outer expansion sleeve 81 and the second outer expansion sleeve 82 to expand outward at the same time, so that the outer expansion sleeve assembly 8 clamps the wheel, thereby fixing the wheel.

[0056] Reference Fig. 9The driving mechanism 3 includes a driving motor 31, a driving wheel 32 and a driven wheel 33. The driving motor 31 is fixed to the installation body 1 away from the rotating tube 2 by bolts. The driving wheel 32 is coaxially fixed to the motor shaft of the driving motor 31. The driven wheel 33 is fixed to the periphery of the rotating tube 2 by welding. The driving wheel 32 and the driven wheel 33 are connected by a belt. The driving motor 31 drives the driving wheel 32 to rotate. The rotation of the driving wheel 32 drives the driven wheel 33 to rotate through the belt. The rotation of the driven wheel 33 drives the rotating tube 2 to rotate.

[0057] The implementation principle of a dynamic balancing machine for detecting the dynamic balance amount of a wheel in an embodiment of the present application is as follows: first, place the wheel on the outer expansion sleeve assembly 8, turn on the drive system 4, and the cylinder 41 drives the vertical moving assembly 6 at the top of the piston rod 42 to move toward the side of the tray assembly 5. The downward movement of the vertical moving assembly 6 drives the inner expansion sleeve assembly 7 to expand outward, and the outward expansion of the inner expansion sleeve assembly 7 squeezes the outer expansion sleeve assembly 8, so that the diameter of the outer expansion sleeve assembly 8 is expanded, thereby achieving clamping of the wheel. Subsequently, turn on the drive mechanism 3, and the motor shaft of the drive motor 31 drives the driving wheel 32 to rotate. The rotation of the driving wheel 32 drives the driven wheel 33 to rotate through the belt, thereby driving the rotating tube 2 to rotate. The rotation of the rotating tube 2 drives the outer expansion sleeve assembly 8 to rotate, and the rotation of the outer expansion sleeve assembly 8 drives the wheel to rotate.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dynamic balancing machine for detecting the dynamic balance of a wheel, comprising a mounting body (1), characterized in that: The installation body (1) is rotatably connected to a rotating tube (2); a top end of the rotating tube (2) is provided with an expansion clamp structure for fixing the wheel; a bottom end of the rotating tube (2) is provided with a driving system (4) for driving the expansion clamp structure to expand so as to clamp the wheel; and a driving mechanism (3) is provided on a side of the installation body (1) away from the rotating tube (2) for driving the expansion clamp structure to rotate; The expansion sleeve clamp structure comprises a tray assembly (5), a vertical moving assembly (6), an inner expansion sleeve assembly (7) and an outer expansion sleeve assembly (8); the tray assembly (5) is arranged at the top end of the rotating tube (2); the vertical moving assembly (6) is arranged on the tray assembly (5); the inner expansion sleeve assembly (7) is sleeved on the vertical moving assembly (6); the outer expansion sleeve assembly (8) is sleeved on the inner expansion sleeve assembly (7); the vertical moving assembly (6) slides toward one side of the tray assembly (5) to squeeze the inner expansion sleeve assembly (7) to expand outwards, thereby driving the outer expansion sleeve assembly (8) to expand outwards to clamp the wheel; The tray assembly (5) comprises a tray (51) and a lower cone (52), wherein the tray (51) is fixed to the top end of the rotating tube (2), and the lower cone (52) is fixed to the top end of the tray (51); The vertical moving assembly (6) comprises a hollow cylinder (61), an upper cone (62) and an inner top plate (63), wherein the upper cone (62) is arranged at the top end of the hollow cylinder (61), the inner top plate (63) is sleeved on a side of the hollow cylinder (61) close to the upper cone (62), and the hollow cylinder (61) is slidably connected in the lower cone (52); The internal expansion sleeve assembly (7) comprises an internal expansion sleeve (71), the inner top surface of the internal expansion sleeve (71) is provided with a first matching conical surface (72), the inner bottom surface of the internal expansion sleeve (71) is provided with a second matching conical surface (73), the internal expansion sleeve (71) is arranged on the lower cone (52), the first matching conical surface (72) is in contact with the upper cone (62), and the second matching conical surface (73) is in contact with the lower cone (52), when the upper cone (62) moves toward one side of the tray (51), the cross-sections of the upper cone (62) and the internal expansion sleeve (71) gradually increase, thereby driving the internal expansion sleeve (71) to expand outwards; The external expansion sleeve assembly (8) comprises a first external expansion sleeve (81) and a second external expansion sleeve (82), wherein the first external expansion sleeve (81) is fixed on the tray assembly (5), and the second external expansion sleeve (82) is arranged on the first external expansion sleeve (81), the inner rings of the first external expansion sleeve (81) and the second external expansion sleeve (82) are in contact with the outer ring of the inner expansion sleeve (71), and the outer diameter of the first external expansion sleeve (81) is greater than the outer diameter of the second external expansion sleeve (82).

2. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: The vertical moving assembly (6) further comprises a top cover (64), wherein the top cover (64) is arranged on the top end of the upper cone (62); A first limiting groove (711) is formed at the top end of the inner expansion sleeve (71), and the top cover (64) is fitted in the first limiting groove (711) to limit the descending height of the upper cone (62).

3. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: A second limiting groove (511) for limiting the outward expansion range of the inner expansion sleeve (71) is provided on the tray (51) near the outer periphery of the lower cone (52).

4. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: The internal expansion sleeve (71) is provided with a plurality of first expansion grooves (712) in the height direction thereof to provide space for its expansion, and the first expansion grooves (712) are arranged in two ways, from the top end of the internal expansion sleeve (71) to the bottom end of the internal expansion sleeve (71) or from the bottom end of the internal expansion sleeve (71) to the top end of the internal expansion sleeve (71).

5. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: A plurality of mounting holes (74) are provided on the side wall of the internal expansion sleeve (71), the mounting holes (74) being provided along the height direction, the internal expansion sleeve (71) being connected to the periphery of the lower cone (52) by means of bolts passing through the mounting holes (74), and the bolts being located in the mounting holes (74); A slide groove (611) is provided on the outer wall of the hollow cylinder (61), and a slider (521) is provided on the inner wall of the lower cone (52). The slider (521) fits in the slide groove (611) to achieve synchronization of the rotation speeds of the hollow cylinder (61) and the lower cone (52).

6. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: A third limiting groove (512) for limiting the outward expansion range of the first external expansion sleeve (81) is formed on the outer ring of the tray (51) away from the lower cone (52).

7. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 1, characterized in that: The first external expansion sleeve (81) comprises a first external expansion sleeve A (811) and a first external expansion sleeve B (812), wherein the first external expansion sleeve A (811) is integrally formed at the top of the first external expansion sleeve B (812), and the outer diameter of the first external expansion sleeve A (811) is smaller than the outer diameter of the first external expansion sleeve B (812).

8. The dynamic balancing machine for detecting the dynamic balance of a wheel according to claim 7, characterized in that: A plurality of second expansion grooves (813) are provided on the first external expansion sleeve A (811) and the first external expansion sleeve B (812) to leave space for the first external expansion sleeve A (811) and the first external expansion sleeve B (812) to expand. One end of the second expansion groove (813) starts from the top of the first external expansion sleeve A (811) and ends at the bottom of the first external expansion sleeve B (812) or starts from the bottom of the first external expansion sleeve B (812) and ends at the top of the first external expansion sleeve A (811), and is arranged in two ways.

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