CN212019074U - Open type fixed table press convenient to move - Google Patents

Abstract

The utility model relates to an open fixed station press convenient to remove, which comprises a bod, the organism includes the seat of honour, a pedestal, the punching press seat and is used for driving the actuating mechanism of punching press seat, still include the supporting wheel subassembly, first caulking groove has been seted up to the base, first caulking groove is the level setting, the supporting wheel subassembly inlays establishes and sliding connection in first caulking groove, the second caulking groove has been seted up in the base, the second caulking groove is the first caulking groove of vertical setting and perpendicular to, the first caulking groove of second caulking groove lower extreme intercommunication, be equipped with on the base and be used for propping the organism apart from the driving cylinder on ground, driving cylinder piston rod fixedly connected with supporting shoe. Through the setting of supporting wheel subassembly, when the organism is stably placed, the supporting wheel subassembly is accomodate in first caulking groove, when needs move the organism, expandes the supporting wheel subassembly and is vertical form and inlay and locate the second caulking groove in, can remove the organism, has improved the convenience that the organism removed.

Description

Open type fixed table press convenient to move

Technical Field

The utility model belongs to the technical field of the press technique and specifically relates to an open fixed station press convenient to remove is related to.

Background

The open type fixed station press has high precision, reliable performance and convenient operation; an automatic feeding device can be arranged to realize semi-automatic punching operation. The cold stamping die is suitable for various cold stamping processes of shearing, blanking, punching, bending, shallow drawing and the like of plates, and is widely applied to various industrial manufacturing departments.

Current open fixed station press, like utility model patent publication No. CN205416466U open fixed station press, including the fuselage, be equipped with actuating mechanism, punching press mechanism and punching press platform on the fuselage, punching press mechanism and punching press platform cooperation, and punching press mechanism passes through the actuating mechanism drive. When the technical scheme is implemented, a workpiece is placed on the stamping platform, and the stamping mechanism is driven by the driving mechanism to complete stamping on the workpiece.

The above prior art solutions have the following drawbacks: the open fixed-bed press has large volume and heavy weight, so that the open fixed-bed press is very difficult, time-consuming and labor-consuming when the open fixed-bed press needs to be moved to work.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, one of the purposes of the utility model is to provide an open fixed station press convenient to remove.

The above object of the present invention can be achieved by the following technical solutions:

an open type fixed station press convenient to move comprises a press body, wherein the press body comprises an upper seat, a base, a stamping seat, a driving mechanism and a supporting wheel assembly, the driving mechanism is used for driving the stamping seat, the supporting wheel assembly is provided with two groups which are respectively arranged at two sides of the bottom end of the base, a first caulking groove used for embedding the supporting wheel assembly is arranged on the outer wall of the base, the first caulking groove is horizontally arranged, the supporting wheel assembly is embedded and slidably connected in the first caulking groove, the supporting wheel assembly comprises an installation seat and a plurality of idler wheels, the plurality of idler wheels are rotatably connected to the installation seat, the plurality of idler wheels are equidistantly arranged on the installation seat, the installation seat is slidably and rotatably connected in the first caulking groove, a second caulking groove is arranged in the base, the second caulking groove is vertically arranged and perpendicular to the first caulking groove, the lower end of the second caulking groove is communicated with the first caulking groove, the mounting seat is embedded and connected to the second caulking groove in a sliding mode, a driving cylinder used for supporting the machine body away from the ground is arranged on the base, and a supporting block is fixedly connected to a piston rod of the driving cylinder.

Through adopting above-mentioned technical scheme, when the organism is stably placed, the supporting wheel subassembly is the level setting and inlays completely and locate first caulking groove, when needs move the organism, at first support the organism through the driving cylinder, make interval then outwards pull out the supporting wheel subassembly from first caulking groove between base and the ground, the mount pad is kept away from first caulking groove open-ended one end and is sliding under the second caulking groove, downwards rotate supporting wheel subassembly to vertical state, make the gyro wheel rotate to the base lower extreme, two sets of supporting wheel subassemblies are all opened the back, slowly shrink driving cylinder, make the gyro wheel butt in ground, supporting wheel subassembly upper end slides to the second caulking groove this moment, and inlay and locate in the second caulking groove, accomplish the expansion of supporting wheel subassembly promptly. Through the setting of supporting wheel subassembly, when the organism is stably placed, the supporting wheel subassembly is accomodate in the organism, when needs move the organism, will outwards take out and expand and be vertical form, can remove the organism, has improved the convenience that the organism removed. And can accomodate in organism one side through the supporting wheel subassembly, conveniently maintain the supporting wheel subassembly.

The present invention may be further configured in a preferred embodiment as: the supporting plate is connected in the second caulking groove in a sliding mode, and a buffer spring used for driving the supporting plate to reset downwards is arranged between the supporting plate and the second caulking groove.

Through adopting above-mentioned technical scheme, expand as the supporting wheel subassembly and be vertical state, and the mount pad upper end inlays when locating the second caulking groove, mount pad upper end butt in the backup pad to being supported by buffer spring, making the organism when removing, buffering through buffer spring has improved the stability when organism removes.

The present invention may be further configured in a preferred embodiment as: the base is provided with a supporting groove for embedding the driving cylinder, the body of the driving cylinder is fixedly embedded in the supporting groove, the piston rod of the driving cylinder penetrates through the supporting groove and is exposed out of the lower end face of the base, and the supporting block can be completely embedded in the supporting groove.

Through adopting above-mentioned technical scheme, when the organism was stably placed, the supporting shoe was inlayed completely and is located and support the groove, made the organism when placing, the base bottom was laminated ground completely, has improved the stability when the organism was placed.

The present invention may be further configured in a preferred embodiment as: the mounting seat is provided with an avoiding groove for the mounting seat to rotate, a rubber pad is fixedly arranged in the avoiding groove, and when the mounting seat rotates to be vertically arranged, the rubber pad is abutted to the lower end face of the base.

Through adopting above-mentioned technical scheme, through the setting of dodging the groove, when the supporting wheel subassembly rotated, the base part that is located first caulking groove lower extreme wore to establish and crosses from dodging the groove, and when the gyro wheel butt in ground, the mount pad was promoted towards the second caulking groove, until dodging terminal surface under the inslot wall butt in the base, through the setting of rubber pad, made the mount pad pass through rubber pad and base contact, prevented that mount pad and base direct contact from causing wearing and tearing and noise.

The present invention may be further configured in a preferred embodiment as: the fixed axle that is equipped with in the first caulking groove, the fixed axle is located under the second caulking groove, first spout has been seted up along its direction of height to the mount pad, the fixed axle is worn to establish and sliding connection in first spout.

Through adopting above-mentioned technical scheme, when the mount pad slided in first caulking groove, the fixed axle slided in first spout, when the mount pad outwards slides to the fixed axle butt when first spout one end inwards, the mount pad one end inwards just in time is located the second caulking groove under, when rotating mount pad to vertical state this moment, the mount pad just in time is convenient for slide to the second caulking groove, make operating personnel when the operation, obtain the feedback through the fixed axle, make things convenient for operating personnel to expand the supporting wheel subassembly.

The present invention may be further configured in a preferred embodiment as: the mount pad is kept away from first caulking groove notch one end fixedly connected with and is removed the axle, all set up in first caulking groove and the second caulking groove and supply to remove the gliding second spout of axle, remove the axle both ends and inlay and establish and sliding connection in second spout.

Through adopting above-mentioned technical scheme, when the mount pad slided in first caulking groove, remove the axle both ends and inlay and establish in the second spout, and set up the direction along the second spout and slide, slide when the mount pad is located under the second caulking groove to removing the axle, rotate mount pad to vertical state, make to remove the axle and can continue upwards to slide along the second spout, make the mount pad inlay and locate in the second caulking groove. Through the setting of second spout, make the mount pad when sliding, through the direction of second spout and removal axle, it is more stable to slide.

The present invention may be further configured in a preferred embodiment as: the second sliding groove comprises a horizontal part and a vertical part, the horizontal part is located in the first caulking groove, the vertical part is located in the second caulking groove, and only one end, close to the opening of the first caulking groove, of the horizontal part is communicated with one end, facing downwards, of the vertical part.

Through adopting above-mentioned technical scheme, when the mount pad outwards slided, the mount pad one end inwards removes under the second caulking groove, removes the axle and has can't continue outwards to slide along the horizontal direction, rotates mount pad to vertical direction this moment, and the mount pad can continue to follow vertical direction and upwards slides, has given operating personnel's feedback, has improved the convenience when launching the mount pad.

The present invention may be further configured in a preferred embodiment as: the roller wheel is axially and slidably connected with a wheel shaft, a shaft hole for the wheel shaft to penetrate through is correspondingly formed in the mounting seat, a limiting block is fixedly arranged at one end of the wheel shaft along the circumferential direction of the wheel shaft, the wheel shaft comprises a smooth section and a threaded section, the threaded section is located at one end, away from the limiting block, of the wheel shaft, and the threaded section is in threaded connection with a fixing nut.

Through adopting above-mentioned technical scheme, when the supporting wheel subassembly only inlays and locates first caulking groove, the gyro wheel is located base one side, when changing the gyro wheel, unscrews fixation nut, takes the shaft out from the shaft hole, can dismantle the gyro wheel from the mount pad get off, conveniently changes the gyro wheel.

To sum up, the utility model discloses a following at least one useful technological effect:

1. through the setting of supporting wheel subassembly, when the organism is stably placed, the supporting wheel subassembly is accomodate in the organism, when needs move the organism, will outwards take out and expand and be vertical form, can remove the organism, has improved the convenience that the organism removed. The supporting wheel assembly can be accommodated at one side of the machine body, so that the supporting wheel assembly is convenient to maintain;

2. the buffer is realized through the buffer spring, so that the stability of the machine body during movement is improved;

3. the supporting wheel assembly is convenient for an operator to unfold.

Drawings

FIG. 1 is a schematic overall structure diagram of the first embodiment;

FIG. 2 is a schematic structural view of a deployment support wheel assembly of the first embodiment;

FIG. 3 is a schematic sectional view showing the structure of the first caulking groove with the support wheel assembly embedded therein according to the first embodiment;

FIG. 4 is a schematic sectional view showing the structure of the supporting wheel assembly inserted into the second insertion groove according to the first embodiment;

FIG. 5 is a schematic structural view of a support wheel assembly according to one embodiment;

FIG. 6 is an exploded view of a support wheel assembly according to one embodiment;

FIG. 7 is a schematic structural view of a support wheel assembly according to a second embodiment;

FIG. 8 is a schematic sectional view showing the first caulking groove and the supporting wheel assembly of the second embodiment;

FIG. 9 is a schematic sectional view showing the structure of the second embodiment in which the supporting wheel assembly is inserted into the second insertion groove.

In the figure, 1, a machine body; 11. an upper seat; 12. a base; 121. a support groove; 122. a compensation groove; 123. an avoidance groove; 124. a rubber pad; 13. punching a seat; 14. a drive mechanism; 2. a support wheel assembly; 21. a mounting seat; 211. a first chute; 212. a shaft hole; 22. a roller; 23. a wheel axle; 231. a limiting block; 232. fixing a nut; 3. a drive cylinder; 31. a support block; 4. a first caulking groove; 41. a fixed shaft; 42. a movable shaft; 5. a second caulking groove; 51. a support plate; 52. a buffer spring; 6. a second chute; 61. a horizontal portion; 62. a vertical portion.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 and 2, for the utility model discloses an open fixed station press convenient to remove, including organism 1, supporting wheel subassembly 2 and the driving cylinder 3 that is used for propping organism 1 off ground. The machine body 1 comprises an upper seat 11, a base 12, a punching seat 13 and a driving mechanism 14 for driving the punching seat 13 to press down. The supporting wheel assembly 2 is provided with two groups and is arranged on two sides of the bottom end of the base 12 in a divided mode, when the supporting wheel assembly 2 is not used, the supporting wheel assembly can be embedded in the base 12 of the machine body 1, when the machine body 1 needs to be moved, the supporting wheel assembly can rotate outwards to the lower end of the base 12, and therefore the machine body 1 can be moved conveniently. The base 12 is provided with a supporting groove 121, the driving cylinder 3 is an oil cylinder, the body of the driving cylinder 3 is fixedly embedded in the supporting groove 121, the lower end of the piston rod of the driving cylinder 3 is fixedly connected with a supporting block 31, and the supporting block 31 is completely embedded in the supporting groove 121 when not in use.

When the machine body 1 is moved, the machine body 1 is slightly supported away from the ground through the driving cylinder 3, then the supporting wheel component 2 slides out from the base 12 and rotates to the lower end of the base 12, and then the driving cylinder 3 contracts, so that the supporting wheel component 2 supports the machine body 1 and the machine body 1 can be conveniently moved. After the movement of the machine body 1 is completed, the driving cylinder 3 supports the machine body 1 off the ground again, and then the supporting wheel assembly 2 is rotated to a horizontal arrangement from the lower end of the base 12 and slides to be embedded in the base 12.

Referring to fig. 3 and 4, the base 12 is provided with a first caulking groove 4 and a second caulking groove 5 for respectively caulking the accommodated state and the unfolded state of the support wheel assembly 2. The first caulking groove 4 is the level setting, and the second caulking groove 5 is vertical setting and perpendicular to first caulking groove 4, and 5 lower extremes of second caulking groove communicate first caulking groove 4. When the supporting wheel component 2 is in the storage state, the supporting wheel component 2 is only embedded in the first embedding groove 4. When the supporting wheel component 2 is unfolded to be in a supporting state, the supporting wheel component 2 penetrates through the first caulking groove 4, and the upper end of the supporting wheel component is embedded in the second caulking groove 5. A support plate 51 is slidably connected in the second caulking groove 5, and a buffer spring 52 for driving the support plate 51 to return downwards is arranged between the support plate 51 and the second caulking groove 5.

When the supporting wheel assembly 2 is not in use, the supporting wheel assembly is horizontally embedded in the first embedding groove 4 and is positioned on one side of the base 12, and the supporting wheel assembly 2 is conveniently stored and periodically maintained and replaced. When the supporting wheel assembly 2 is used, the supporting wheel assembly 2 is embedded in the second caulking groove 5, and the supporting wheel assembly 2 is limited through the second caulking groove 5, so that the supporting wheel assembly is always kept in a vertical shape, and the machine body 1 is conveniently moved stably. And through the buffer spring 52 and the supporting plate 51 in the second caulking groove 5, when the machine body 1 moves by using the supporting wheel assembly 2, the rollers 22 at two sides can buffer vibration through the buffer spring 52, and the moving stability of the machine body 1 is improved.

Referring to fig. 5, the support wheel assembly 2 includes a mount 21 and five rollers 22. Each mounting seat 21 is rotatably connected with five rollers 22, and the five rollers 22 are equidistantly arranged on the mounting seat 21 along the length direction of the mounting seat 21.

Referring to fig. 2 and 5, the base 12 is provided with compensation grooves 122 at two ends of the first caulking groove 4 for the mounting seat 21 to turn downward, the mounting seat 21 is provided with avoidance grooves 123 for the mounting seat to turn downward, and the support wheel assembly 2 can pass through the base 12 and turn downward to a vertical state through the arrangement of the compensation grooves 122 and the avoidance grooves 123. Dodge groove 123 internal fixation and be equipped with rubber pad 124, when mount pad 21 rotates to being vertical setting, when organism 1 removed, supporting wheel subassembly 2 slided in second caulking groove 5, dodged groove 123 when contacting with base 12 bottom, cushioned through rubber pad 124, reduce the wearing and tearing when dodging groove 123 department and base 12 bottom collision, the production of noise when also having reduced the collision simultaneously.

Referring to fig. 3 and 4, a fixing shaft 41 is fixedly disposed in the first caulking groove 4, and the fixing shaft 41 is located right below the second caulking groove 5. First spout 211 has been seted up along its direction of height to mount pad 21, and first spout 211 communicates mount pad 21 both ends end wall, and first spout 211 cross-section is waist type, and fixed axle 41 wears to establish and sliding connection in first spout 211.

When the mount 21 slides in the first caulking groove 4, the fixed shaft 41 slides in the first sliding groove 211. When mount pad 21 outwards slides, until fixed axle 41 butt when first spout 211 one end inwards, mount pad 21 one end inwards just in time is located the second caulking groove 5 under, when rotating mount pad 21 to vertical state this moment, mount pad 21 just in time can directly slide to second caulking groove 5 along vertical direction, make operating personnel when the operation, when outwards pulling out supporting wheel subassembly 2, direct pulling is to can not the pulling, can rotate supporting wheel subassembly 2 downwards, the feedback is provided for operating personnel, make things convenient for operating personnel to expand supporting wheel subassembly 2.

Referring to fig. 6, the roller 22 is axially inserted and slidably connected to the axle 23, and the mounting base 21 is correspondingly provided with a wheel groove for the roller 22 to rotate and an axle hole 212 for the axle 23 to be inserted. Wheel shaft 23 one end is fixed along its circumference and is equipped with stopper 231, and wheel shaft 23 includes smooth section and screw thread section, and the screw thread section is located the one end that wheel shaft 23 kept away from stopper 231, and screw thread section threaded connection has fixation nut 232.

After the supporting wheel assembly 2 is used for a long time, the roller 22 is easy to break or sundries are blocked between the wheel shaft 23 and the roller 22, so that the roller 22 is difficult to rotate, and the roller 22 needs to be repaired and replaced regularly. When the supporting wheel assembly 2 is in the storage state and is embedded in the first embedding groove 4, the roller 22 is located on one side of the base 12 and is exposed out of the first embedding groove 4. When the roller 22 is replaced, the fixing nut 232 is unscrewed, the axle 23 is pulled out from the axle hole 212, and the single roller 22 can be detached from the mounting seat 21, so that the roller 22 is convenient to replace.

The implementation principle of the embodiment is as follows:

1. when the machine body 1 is in a stable placement state, the supporting wheel assembly 2 is horizontally embedded in the first embedding groove 4, and the supporting block 31 is also completely embedded in the supporting groove 121.

2. When the machine body 1 needs to be moved, the driving cylinder 3 drives the supporting block 31 to extend outwards from the supporting groove 121, so that the machine body 1 is supported to a distance away from the ground, the supporting wheel assembly 2 is pulled outwards from the first caulking groove 4 until the fixing shaft 41 abuts against one end of the first sliding groove 211, the supporting wheel assembly 2 is turned downwards, the mounting seat 21 is turned downwards to be in a vertical state through the avoiding groove 123 formed in the mounting seat 21 and the compensating groove 122 formed in the base 12, after the supporting wheel assemblies 2 on the two sides are all turned over, the driving cylinder 3 contracts, the roller 22 abuts against the ground until the upper end of the mounting seat 21 abuts against the supporting plate 51, and until the supporting wheel assemblies 2 complete supporting.

3. After the machine body 1 finishes moving, the driving cylinder 3 supports the machine body 1 off the ground again, then the supporting wheel component 2 is rotated to a horizontal position from the lower end of the base 12 and pushed into the first caulking groove 4, so that the supporting wheel component 2 slides and is embedded in the first caulking groove 4, and finally the driving cylinder 3 is contracted, so that the bottom end of the base 12 is abutted against the ground for placing.

Example two:

the difference between the second embodiment and the first embodiment is that:

the first caulking groove 4 is provided with no fixed shaft 41, and the mounting base 21 is not provided with the first sliding groove 211.

Referring to fig. 7, a moving shaft 42 is fixedly connected to one end of the mounting seat 21 away from the notch of the first caulking groove 4. Referring to fig. 8 and 9, the first caulking groove 4 and the second caulking groove 5 are both provided with a second sliding groove 6 for the moving shaft 42 to slide, and two ends of the moving shaft 42 are embedded and slidably connected to the second sliding groove 6. The second sliding chute 6 comprises a horizontal part 61 positioned in the first caulking groove 4 and a vertical part 62 positioned in the second caulking groove 5, wherein the horizontal part 61 is only communicated with one downward end of the vertical part 62 at one end close to the opening of the first caulking groove 4, so that the cross section of the second sliding chute 6 is L-shaped, and the right-angled corner of the L-shaped second sliding chute 6 is positioned right below the second caulking groove 5.

When supporting wheel subassembly 2 outwards slided, and the one end that mount pad 21 inwards moves to under the second caulking groove 5, moves axle 42 and has failed to continue outwards sliding along the horizontal direction through the setting of second spout 6, rotates mount pad 21 to vertical direction this moment, and mount pad 21 can continue to follow vertical direction and upwards slides, has given operating personnel's feedback, makes things convenient for operating personnel to expand supporting wheel subassembly 2. By the arrangement of the moving shaft 42 and the second sliding groove 6, the stable sliding effect and the feedback function of the support wheel assembly 2 are also maintained. Meanwhile, the opening of the first sliding groove 211 on the mounting seat 21 is reduced, and the bearing capacity of the mounting seat 21 is improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides an open fixed station press convenient to remove, includes organism (1), organism (1) is including upper bracket (11), base (12), punching press seat (13) and be used for driving actuating mechanism (14) of punching press seat (13), its characterized in that: the supporting wheel assembly is characterized by further comprising supporting wheel assemblies (2), the supporting wheel assemblies (2) are provided with two groups and are respectively arranged at two sides of the bottom end of the base (12), the outer wall of the base (12) is provided with a first caulking groove (4) used for embedding the supporting wheel assemblies (2), the first caulking groove (4) is horizontally arranged, the supporting wheel assemblies (2) are embedded and are connected in the first caulking groove (4) in a sliding mode, each supporting wheel assembly (2) comprises an installation seat (21) and a plurality of idler wheels (22), the plurality of idler wheels (22) are rotatably connected to the installation seat (21), the plurality of idler wheels (22) are arranged on the installation seat (21) in an equidistant mode, the installation seat (21) is connected in the first caulking groove (4) in a sliding mode and is rotatably connected to the first caulking groove (4), a second caulking groove (5) is formed in the base (12), the second caulking groove (5) is vertically arranged and is perpendicular to the, second caulking groove (5) lower extreme intercommunication first caulking groove (4), mount pad (21) are inlayed and are established and sliding connection in second caulking groove (5), be equipped with on base (12) and be used for propping organism (1) from ground actuating cylinder (3), actuating cylinder (3) piston rod fixedly connected with supporting shoe (31).

2. A portable open fixed bed press as claimed in claim 1, wherein: a supporting plate (51) is connected in the second caulking groove (5) in a sliding mode, and a buffer spring (52) used for driving the supporting plate (51) to reset downwards is arranged between the supporting plate (51) and the second caulking groove (5).

3. A portable open fixed bed press as claimed in claim 1, wherein: the base (12) is provided with a supporting groove (121) for embedding the driving cylinder (3), the body of the driving cylinder (3) is fixedly embedded in the supporting groove (121), the piston rod of the driving cylinder (3) penetrates through the supporting groove (121) and is exposed out of the lower end face of the base (12), and the supporting block (31) can be completely embedded in the supporting groove (121).

4. A portable open fixed bed press as claimed in claim 1, wherein: offer on mount pad (21) and supply its self pivoted to dodge groove (123), dodge groove (123) internal fixation and be equipped with rubber pad (124), when mount pad (21) rotate to be vertical setting, terminal surface under base (12) rubber pad (124) butt.

5. A portable open fixed bed press as claimed in claim 1, wherein: first caulking groove (4) internal fixation is equipped with fixed axle (41), fixed axle (41) are located under second caulking groove (5), first spout (211) have been seted up along its direction of height in mount pad (21), fixed axle (41) are worn to establish and sliding connection in first spout (211).

6. A portable open fixed bed press as claimed in claim 1, wherein: first caulking groove (4) notch one end fixedly connected with removal axle (42) is kept away from in mount pad (21), all offer in first caulking groove (4) and second caulking groove (5) and supply to remove gliding second spout (6) of axle (42), remove axle (42) both ends and inlay and establish and sliding connection in second spout (6).

7. The portable open fixed bed press of claim 6, wherein: the second sliding groove (6) comprises a horizontal part (61) located in the first caulking groove (4) and a vertical part (62) located in the second caulking groove (5), and one end, close to the opening of the first caulking groove (4), of the horizontal part (61) is communicated with the downward end of the vertical part (62).

8. A portable open fixed bed press as claimed in claim 1, wherein: the roller (22) is axially penetrated and slidably connected with a wheel shaft (23), a shaft hole (212) for the wheel shaft (23) to penetrate is correspondingly formed in the mounting seat (21), a limiting block (231) is fixedly arranged at one end of the wheel shaft (23) along the circumferential direction of the wheel shaft, the wheel shaft (23) comprises a smooth section and a threaded section, the threaded section is located at one end, away from the limiting block (231), of the wheel shaft (23), and the threaded section is in threaded connection with a fixing nut (232).

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