Hub supporting device for hub laser engraving

Abstract

The invention discloses a wheel hub supporting device for wheel hub laser engraving, and relates to the technical field of laser engraving cutting machines, a wheel hub is clamped through an electric telescopic rod, a fixing plate, a sliding rod and a clamping plate, when the clamping force is too large, the clamping plate is stressed to move inwards to be matched with the sliding rod, a limiting rod and a clamping groove plate, so that the fixing plate cannot continue to move forwards; when one side of the hub is engraved, the clamping plate stops moving, in this way, the clamping plate conducts anti-clamping measures on the hub during clamping, improper clamping possibly enables the hub to locally bear overlarge stress, and hidden damage such as microscopic cracks is generated on the surface or the internal structure of the hub. The whole fixing device is turned over through the driving frame and the electric telescopic rod, namely, a hub is turned over, the whole production process can be smoother through turning-over operation, the equipment downtime caused by hub assembling and disassembling is shortened, and the equipment utilization rate and the production efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser engraving cutting machines, and particularly to a hub support device for hub laser engraving. Background Technique

[0002] As a high-precision and high-efficiency processing method, laser engraving technology has been widely used in industrial production. In the field of automobile manufacturing, as one of the important components, the surface markings, patterns, etc. of the hub need to be engraved with high precision to meet the needs of personalization and branding. Laser engraving technology, with its advantages of non-contact processing, high precision, and high speed, has gradually become the main method for hub engraving.

[0003] The patent with the patent announcement number CN210306329U relates to the technical field of laser engraving cutting machines. This patent discloses a workpiece support device for a laser engraving cutting machine, belonging to the technical field of laser engraving cutting machines, including a pressing plate and a bottom plate. A threaded cap is clamped on the upper surface of the pressing plate, and a threaded column is in threaded connection inside the threaded cap. The top and bottom ends of the threaded column are respectively fixedly connected with a screwing ring and a rotating shaft. A bearing is sleeved on the outer surface of the rotating shaft, and the bearing is clamped on the upper surface of the bottom plate. The upper surface of the pressing plate is fixedly connected with the lower surface of a fixing plate through a spring rod, and the number of spring rods is two; by setting the pressing plate and the bottom plate, the pressing plate and the bottom plate can clamp the workpiece. When the pressing plate and the bottom plate are fixed, the workpiece cannot displace during processing. By setting suction cup a and suction cup b, suction cup a and suction cup b can respectively suck the inner wall of the laser engraving machine, so that the pressing plate and the bottom plate can be stably fixed, and thus the workpiece can be fixed more stably.

[0004] In the above patent, the workpiece can be fixed more stably, but there are the following problems with the current equipment: a relatively large clamping force may cause local plastic deformation on the surface of the hub, making the hub surface uneven and affecting the effect and quality of laser engraving. Especially for some high-precision laser engraving processes, surface deformation may lead to distortion of the engraved pattern or text. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a hub support device for hub laser engraving, which solves the problems raised in the above background technique.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: A hub support device for laser engraving of hubs, including a base and a hub, the hub is arranged above the base, and further includes a fixing device; wherein, the fixing device includes a driving frame, an electric telescopic rod, a fixing plate, a sliding rod, a clamping plate, a first spring, a clamping groove plate, a limiting rod, a triangular block and a suction cup rod, the driving frame is arranged on the top of the base, the fixed end of the electric telescopic rod is fixedly installed at the output end of the driving frame, the fixing plate is fixedly installed at the output end of the electric telescopic rod, the sliding rod is slidably installed on the inner wall of the fixing plate, the clamping plate is fixedly installed on the left side of the sliding rod, the first spring is arranged between the clamping plate and the fixing plate, and the first spring is used to drive the clamping plate to reset. The output end of the electric telescopic rod extends to drive the fixing plate and the clamping groove plate to move simultaneously. The movement of the fixing plate drives the sliding rod to move, the movement of the sliding rod drives the clamping plate to move, and the movement of the clamping plate contacts the side surface of the hub so that the hub is clamped. The clamping groove plate is fixedly installed at the output end of the electric telescopic rod, the limiting rod is slidably installed on the right side of the fixing plate, the triangular block is fixedly installed on the inner wall of the clamping groove plate, and the suction cup rod is arranged on the surface of the base; Wherein, it further includes a supporting device for auxiliary support of the bottom of the hub and a bottom supporting device for auxiliary support after the hub is turned over.

[0007] According to the above technical solution, the bottom of the limiting rod is set as an inclined surface. The movement of the sliding rod contacts the inclined surface of the limiting rod so that the limiting rod moves upward. A second spring is arranged between the limiting rod and the fixing plate, and the second spring is used to drive the limiting rod to reset.

[0008] According to the above technical solution, the supporting device includes a fixed seat, an electric push rod and a third spring. The fixed seat is fixedly installed on the top of the base. The fixed end of the electric push rod is slidably installed on the inner wall of the fixed seat. The third spring is arranged between the fixed end of the electric push rod and the fixed seat. The third spring is used to drive the fixed end of the electric push rod to reset. When the hub is turned over, at this time the hub will move the supporting rod downward. The movement of the supporting rod makes the fixed end of the electric push rod move downward and compress the third spring simultaneously. The movement of the fixed end of the electric push rod makes the entire supporting device move. When the hub is turned over, at this time the hub will move the supporting rod downward. The movement of the supporting rod makes the fixed end of the electric push rod move downward and compress the third spring simultaneously. The movement of the fixed end of the electric push rod makes the entire supporting device move.

[0009] According to the above technical solution, the supporting device further includes a U-shaped frame and a round button frame. The U-shaped frame is fixedly installed at the fixed end of the electric push rod, and the round button frame is fixedly installed at the output end of the electric push rod. The movement of the output end of the electric push rod drives the round button frame to move.

[0010] According to the above technical solution, the supporting device further includes a gear, a tooth block rod and a supporting rod. The gear is rotatably installed on the inner wall of the round button frame. The tooth block rod is slidably installed on the inner wall of the U-shaped frame. The gear meshes with the tooth block rod. The supporting rod is fixedly installed on the surface of the tooth block rod. If the surface of the hub is uneven after engraving, the tooth block rod is driven to move downward by the force on the supporting rod. The movement of the tooth block rod drives the gear to rotate. The rotation of the gear causes the tooth block rod on the other side to slide until the two tooth block rods are level with each other respectively.

[0011] According to the above technical solution, the bottom supporting device includes an elastic telescopic rod, a connecting frame and a supporting plate. The fixed end of the elastic telescopic rod is rotatably installed on the surface of the round button frame. The connecting frame is fixedly installed at the movable end of the elastic telescopic rod. The supporting plate is rotatably installed on the surface of the connecting frame. A first torsion spring is arranged between the fixed end of the elastic telescopic rod and the round button frame. When the hub is not turned over, the first torsion spring at the movable end of the elastic telescopic rod is in a compressed state and the movable end of the elastic telescopic rod is restricted by the inclined groove rod.

[0012] According to the above technical solution, the bottom supporting device further includes a driving rod, an arc rod and a driving block. The driving rod is fixedly installed at the fixed end of the electric push rod. The arc rod is fixedly installed on the top of the base. The driving block is slidably installed on the surface of the arc rod. The movement of the driving rod contacts the inclined surface of the driving block, causing the driving block to move forward.

[0013] According to the above technical solution, the bottom supporting device further includes an inclined groove rod, a pushing button and a connecting rod. The inclined groove rod is slidably installed inside the arc rod. A fourth spring is arranged between the inclined groove rod and the arc rod. The fourth spring drives the inclined groove rod to reset. The pushing button is fixedly installed on the surface of the inclined groove rod. One side of the connecting rod is slidably installed on the circumferential surface of the inclined groove rod. The other side of the connecting rod is fixedly installed on the front side of the driving block. By manually resetting the fixed end of the elastic telescopic rod, it contacts the inclined surface of the inclined groove rod, causing the inclined groove rod to compress the fourth spring and move outward. When the inclined groove rod overlaps with the movable end of the elastic telescopic rod, the fourth spring is released to drive the inclined groove rod to insert into the movable end of the elastic telescopic rod.

[0014] The present invention provides a hub support device for laser engraving of hubs. It has the following beneficial effects: In this invention, through the setting of the fixing device, the hub is clamped by the electric telescopic rod, the fixing plate, the sliding rod and the clamping plate. When the clamping force is too large, the clamping plate moves inward under the force and cooperates with the sliding rod, the limiting rod and the clamping groove plate to prevent the fixing plate from moving forward continuously, that is, the clamping plate stops moving. In this way, anti-pinching measures are taken for the hub during clamping. Improper clamping may cause excessive stress on a local part of the hub, resulting in hidden damages such as microscopic cracks on the surface or inside structure of the hub. After engraving one side of the hub, the entire fixing device is flipped through the driving frame and the electric telescopic rod, that is, the hub is turned over. The turning-over operation can make the entire production process more smooth, reduce the equipment downtime caused by loading and unloading the hub, and improve the utilization rate and production efficiency of the equipment. (2) In this invention, through the setting of the fixing device, after clamping, the side of the hub is assisted to be fixed by the suction cup rod, making the position of the hub more stable.

[0015] (3) In this invention, through the setting of the supporting device, after the hub is fixed, the bottom of the hub is assisted to be supported by the supporting rod. If the surface of the hub is uneven after engraving, the supporting rod drives the tooth block rod and the gear under the force, making the two side tooth block rods level respectively. At this time, the supporting rod can assist in supporting the supporting part of the hub that is not on the same horizontal plane. The adjustable support can make the surface of the hub flat, ensure that the incident angle and penetration depth of the laser are consistent in the entire engraving area, realize the precise control of the engraving depth, meet the design requirements. When the hub is turned over, the hub will move the entire supporting device, so that the hub will not be blocked by the supporting device when being turned over, improving the smoothness of the hub turning-over.

[0016] (4) In this invention, through the setting of the bottom supporting device, when the hub is not turned over, the first torsion spring at the movable end of the elastic telescopic rod is in a compressed state and the movable end of the elastic telescopic rod is restricted by the inclined groove rod. Through the electric push rod, the driving rod, the driving block, the connecting rod and the pushing button, the inclined groove rod is disengaged from the restriction of the elastic telescopic rod. At this time, the movable end of the elastic telescopic rod is released, so that the fixed end of the elastic telescopic rod is also released and quickly resets to drive the connecting frame to move. The movement of the connecting frame drives the supporting plate to move, realizing the support for the bottom of the hub after being turned over by 90°, so that the engraving operation of hubs with different specifications can be adapted, improving the versatility and flexibility of the equipment. By manually resetting the fixed end of the elastic telescopic rod, the bottom supporting device can be stored, saving the operation space. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the partial sectional structure of the fixing device of the present invention; Figure 3Schematic diagram of the position structure of the elastic telescopic rod and the arc rod of the present invention; Figure 4 Schematic diagram of the structure of the support device of the present invention; Figure 5 Schematic diagram of the position structure of the support plate and the inclined groove rod of the present invention; Figure 6 Schematic diagram of the position structure of the driving rod and the driving block of the present invention; Figure 7 Schematic diagram of the position structure of the push button and the connecting rod of the present invention.

[0018] In the figure: 1, base; 2, hub; 3, drive frame; 4, electric telescopic rod; 5, fixing plate; 6, sliding rod; 7, clamping plate; 8, first spring; 9, clamping groove plate; 10, limiting rod; 11, triangular block; 12, suction cup rod; 20, fixed seat; 21, electric push rod; 22, third spring; 23, U-shaped frame; 24, round button frame; 25, gear; 26, tooth block rod; 27, support rod; 30, elastic telescopic rod; 31, connecting frame; 32, support plate; 33, driving rod; 34, arc rod; 35, driving block; 36, inclined groove rod; 37, push button; 38, connecting rod. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-7, an embodiment of the present invention is: a wheel hub support device for laser engraving of a wheel hub, including a base 1 and a wheel hub 2. The wheel hub 2 is arranged above the base 1, and further includes a fixing device; wherein, the fixing device includes a driving frame 3, an electric telescopic rod 4, a fixing plate 5, a sliding rod 6, a clamping plate 7, a first spring 8, a clamping groove plate 9, a limiting rod 10, a triangular block 11 and a suction cup rod 12. The driving frame 3 is arranged on the top of the base 1, the fixed end of the electric telescopic rod 4 is fixedly installed at the output end of the driving frame 3, the fixing plate 5 is fixedly installed at the output end of the electric telescopic rod 4, the sliding rod 6 is slidably installed on the inner wall of the fixing plate 5, the clamping plate 7 is fixedly installed on the left side of the sliding rod 6, and the first spring 8 is arranged between the clamping plate 7 and the fixing plate 5. By setting the first spring 8, the clamping plate 7 is driven to reset. The clamping groove plate 9 is fixedly installed at the output end of the electric telescopic rod 4, the limiting rod 10 is slidably installed on the right side of the fixing plate 5, and the triangular block 11 is fixedly installed on the inner wall of the clamping groove plate 9. In this way, anti-pinching measures are taken for the wheel hub 2 when the clamping plate 7 clamps. Improper clamping may cause the wheel hub 2 to bear excessive stress locally, resulting in hidden damages such as microscopic cracks on the surface or internal structure of the wheel hub 2. The suction cup rod 12 is arranged on the surface of the base 1.

[0021] The bottom of the limiting rod 10 is set as an inclined surface, and a second spring is arranged between the limiting rod 10 and the fixing plate 5. By setting the second spring, the limiting rod 10 is driven to reset.

[0022] During the operation of this embodiment, the output end of the electric telescopic rod 4 extends to drive the fixing plate 5 and the clamping groove plate 9 to move simultaneously. The movement of the fixing plate 5 drives the sliding rod 6 to move, and the movement of the sliding rod 6 drives the clamping plate 7 to move. The movement of the clamping plate 7 will contact the side surface of the wheel hub 2, causing the wheel hub 2 to be clamped. When the clamping force is too large, at this time, the clamping plate 7 moves inward under force. The movement of the clamping plate 7 drives the sliding rod 6 to move, and the movement of the sliding rod 6 will contact the inclined surface of the limiting rod 10, causing the limiting rod 10 to move upward. The upward movement of the limiting rod 10 will insert into the clamping groove plate 9, making the fixing plate 5 unable to continue moving forward, that is, stopping the movement of the clamping plate 7. In this way, anti-pinching measures are taken for the wheel hub 2 when the clamping plate 7 clamps. Improper clamping may cause the wheel hub 2 to bear excessive stress locally, resulting in hidden damages such as microscopic cracks on the surface or internal structure of the wheel hub 2. During subsequent use, these damages may gradually expand, reducing the strength and service life of the wheel hub 2, and even causing safety accidents. After clamping, the side surface of the wheel hub 2 is assisted to be fixed by the suction cup rod 12, making the position of the wheel hub 2 more stable. After engraving one side of the wheel hub 2, the driving frame 3 drives the fixed end of the electric telescopic rod 4 to rotate, causing the entire fixing device to flip, that is, turning over the wheel hub 2. The turning-over operation can make the entire production process more smooth, reduce the equipment downtime caused by loading and unloading the wheel hub 2, and improve the utilization rate and production efficiency of the equipment.

[0023] Please refer to Figures 1-7, on the basis of the above embodiments, in another embodiment of the present invention, a support device for auxiliary support of the bottom of the hub 2 and a bottom support device for auxiliary support after the hub 2 is flipped are further included. The support device includes a fixed seat 20, an electric push rod 21, and a third spring 22. The fixed seat 20 is fixedly installed on the top of the base 1. The fixed end of the electric push rod 21 is slidably installed on the inner wall of the fixed seat 20. The third spring 22 is arranged between the fixed end of the electric push rod 21 and the fixed seat 20, and the fixed end of the electric push rod 21 is driven to reset by the provided third spring 22.

[0024] The support device further includes a U-shaped frame 23 and a round button frame 24. The U-shaped frame 23 is fixedly installed at the fixed end of the electric push rod 21, and the round button frame 24 is fixedly installed at the output end of the electric push rod 21, and the two are driven to move by the electric push rod 21.

[0025] The support device further includes a gear 25, a toothed block rod 26, and a support rod 27. The gear 25 is rotatably installed on the inner wall of the round button frame 24. The toothed block rod 26 is slidably installed on the inner wall of the U-shaped frame 23. The gear 25 meshes with the toothed block rod 26. The support rod 27 is fixedly installed on the surface of the toothed block rod 26, so that the support rod 27 can assist in supporting the support points of the hub 2 that are not on the same horizontal plane. The adjustable support can make the surface of the hub 2 flat, ensure that the incident angle and penetration depth of the laser are consistent throughout the engraving area, and achieve precise control of the engraving depth to meet the design requirements.

[0026] The bottom support device includes an elastic telescopic rod 30, a connecting frame 31, and a support plate 32. The fixed end of the elastic telescopic rod 30 is rotatably installed on the surface of the round button frame 24. The connecting frame 31 is fixedly installed at the movable end of the elastic telescopic rod 30. The support plate 32 is rotatably installed on the surface of the connecting frame 31. A first torsion spring is arranged between the fixed end of the elastic telescopic rod 30 and the round button frame 24, and the fixed end of the elastic telescopic rod 30 is driven to reset by the provided first torsion spring to support the bottom of the hub 2 after it is flipped 90°, so as to adapt to the engraving operations of hubs 2 of different specifications and improve the versatility and flexibility of the equipment.

[0027] The bottom support device further includes a driving rod 33, an arc rod 34, and a driving block 35. The driving rod 33 is fixedly installed at the fixed end of the electric push rod 21. The arc rod 34 is fixedly installed on the top of the base 1. The driving block 35 is slidably installed on the surface of the arc rod 34, so that the fixed end of the elastic telescopic rod 30 is released simultaneously.

[0028] The bottom support device further includes an inclined chute rod 36, a push button 37 and a connecting rod 38. The inclined chute rod 36 is slidably installed on the inner wall of the arc rod 34. A fourth spring is provided between the inclined chute rod 36 and the arc rod 34. The fourth spring drives the inclined chute rod 36 to reset. The push button 37 is fixedly installed on the surface of the inclined chute rod 36. One side of the connecting rod 38 is slidably installed on the circumferential surface of the inclined chute rod 36, and the other side of the connecting rod 38 is fixedly installed on the front side of the driving block 35, so that the bottom support device can be stored, saving operation space.

[0029] When this embodiment works, after the hub 2 is fixed, the bottom of the hub 2 is supported by the support rod 27. If the surface of the hub 2 is uneven after engraving, the support rod 27 drives the tooth block rod 26 to move downward under force. The movement of the tooth block rod 26 drives the gear 25 to rotate. The rotation of the gear 25 causes the tooth block rod 26 on the other side to slide until the two tooth block rods 26 are level respectively. At this time, the support rod 27 can assist in supporting the non-horizontal support points of the hub 2, and the adjustable support can make the surface of the hub 2 flat, ensuring that the incident angle and penetration depth of the laser are consistent throughout the engraving area, realizing precise control of the engraving depth, meeting the design requirements. When the hub 2 is turned over, at this time, the hub 2 will move the support rod 27 downward. The movement of the support rod 27 causes the fixed end of the electric push rod 21 to move downward and compress the third spring 22 at the same time. The movement of the fixed end of the electric push rod 21 causes the entire support device to move, so that the hub 2 will not be blocked by the support device when it is turned over, improving the smoothness of turning over the hub 2; When the hub 2 is not turned over, the first torsion spring at the movable end of the elastic telescopic rod 30 is in a compressed state and the movable end of the elastic telescopic rod 30 is restricted by the inclined chute rod 36. When the electric push rod 21 moves downward, it drives the driving rod 33 to move. The movement of the driving rod 33 contacts the inclined surface of the driving block 35, causing the driving block 35 to move forward. The movement of the driving block 35 drives the connecting rod 38 to move. The movement of the connecting rod 38 contacts the push button 37 and causes the push button 37 to be pushed. The movement of the push button 37 drives the inclined chute rod 36 to move. The movement of the inclined chute rod 36 will disengage from the restriction on the elastic telescopic rod 30. At this time, the movable end of the elastic telescopic rod 30 is released, so that the fixed end of the elastic telescopic rod 30 is also released and quickly resets to drive the connecting frame 31 to move. The movement of the connecting frame 31 drives the support plate 32 to move, realizing the support of the bottom of the hub 2 after being turned over by 90°, so that the engraving operation of hubs 2 of different specifications can be adapted, improving the versatility and flexibility of the equipment. By manually resetting the fixed end of the elastic telescopic rod 30, it contacts the inclined surface of the inclined chute rod 36, causing the inclined chute rod 36 to compress the fourth spring and move outward. When the inclined chute rod 36 overlaps with the movable end of the elastic telescopic rod 30, the fourth spring is released to drive the inclined chute rod 36 to insert into the movable end of the elastic telescopic rod 30, so that the bottom support device can be stored, saving operation space.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wheel hub support device for wheel hub laser engraving, comprising a base (1) and a wheel hub (2), characterized in that: The wheel hub (2) is arranged above the base (1), and also includes a fixing device; The fixing device comprises a driving frame (3), an electric telescopic rod (4), a fixing plate (5), a sliding rod (6), a clamping plate (7), a first spring (8), a slot plate (9), a limiting rod (10), a triangular block (11) and a suction cup rod (12); the driving frame (3) is arranged on the top of the base (1); the fixed end of the electric telescopic rod (4) is fixedly mounted on the output end of the driving frame (3); the fixing plate (5) is fixedly mounted on the output end of the electric telescopic rod (4); the sliding rod (6) is slidably mounted on the inner wall of the fixing plate (5); the clamping plate (7) is fixedly mounted on the left side of the sliding rod (6); the first spring (8) is arranged between the clamping plate (7) and the fixing plate (5); the slot plate (9) is fixedly mounted on the output end of the electric telescopic rod (4); the limiting rod (10) is slidably mounted on the right side of the fixing plate (5); the triangular block (11) is fixedly mounted on the inner wall of the slot plate (9); and the suction cup rod (12) is arranged on the surface of the base (1); It also includes a support device for providing auxiliary support to the bottom of the wheel hub (2) and a bottom supporting device for providing auxiliary support to the wheel hub (2) after it is turned over.

2. A hub support device for hub laser engraving according to claim 1, characterized in that: The bottom of the limiting rod (10) is arranged as an inclined surface, and a No. 2 spring is arranged between the limiting rod (10) and the fixing plate (5).

3. A hub support device for hub laser engraving according to claim 2, characterized in that: The supporting device comprises a fixed seat (20), an electric push rod (21) and a No. 3 spring (22); the fixed seat (20) is fixedly mounted on the top of the base (1); the fixed end of the electric push rod (21) is slidably mounted on the inner wall of the fixed seat (20); and the No. 3 spring (22) is arranged between the fixed end of the electric push rod (21) and the fixed seat (20).

4. A hub support device for hub laser engraving according to claim 3, characterized in that: The supporting device further comprises a U-shaped frame (23) and a round button frame (24), wherein the U-shaped frame (23) is fixedly mounted on a fixed end of the electric push rod (21), and the round button frame (24) is fixedly mounted on an output end of the electric push rod (21).

5. The wheel hub support device for wheel hub laser engraving according to claim 4, characterized in that: The supporting device further comprises a gear (25), a tooth block rod (26) and a supporting rod (27); the gear (25) is rotatably mounted on the inner wall of the round button frame (24); the tooth block rod (26) is slidably mounted on the inner wall of the U-shaped frame (23); the gear (25) is meshed with the tooth block rod (26); and the supporting rod (27) is fixedly mounted on the surface of the tooth block rod (26).

6. A hub support device for hub laser engraving according to claim 5, characterized in that: The bottom supporting device comprises an elastic telescopic rod (30), a connecting frame (31) and a supporting plate (32); the fixed end of the elastic telescopic rod (30) is rotatably mounted on the surface of the round button frame (24); the connecting frame (31) is fixedly mounted on the movable end of the elastic telescopic rod (30); the supporting plate (32) is rotatably mounted on the surface of the connecting frame (31); and a first torsion spring is provided between the fixed end of the elastic telescopic rod (30) and the round button frame (24).

7. A hub support device for hub laser engraving according to claim 6, characterized in that: The bottom supporting device further comprises a driving rod (33), an arc rod (34) and a driving block (35); the driving rod (33) is fixedly mounted on a fixed end of the electric push rod (21); the arc rod (34) is fixedly mounted on the top of the base (1); and the driving block (35) is slidably mounted on the surface of the arc rod (34).

8. The wheel hub support device for wheel hub laser engraving according to claim 7, characterized in that: The bottom supporting device further comprises an inclined groove rod (36), a push button (37) and a connecting rod (38); the inclined groove rod (36) is slidably mounted on the inner wall of the arc rod (34); a No. 4 spring is provided between the inclined groove rod (36) and the arc rod (34); the push button (37) is fixedly mounted on the surface of the inclined groove rod (36); one side of the connecting rod (38) is slidably mounted on the circumferential surface of the inclined groove rod (36); and the other side of the connecting rod (38) is fixedly mounted on the front side of the driving block (35).

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