An automatic assembly machine for ox horn wheels

Abstract

The invention discloses an automatic assembly machine for ox-horn wheels, comprising a caster bracket input mechanism for inputting caster brackets, a caster bracket step moving mechanism, a caster bracket rotation detection mechanism, a nut automatic feeding mechanism, a roller automatic feeding mechanism, an automatic riveting mechanism, a conveying track and an installation frame, wherein the caster bracket step moving mechanism is used to sequentially position and transmit the caster bracket between various mechanisms, the caster bracket rotation detection mechanism is used to detect whether the input caster bracket rotates abnormally and remove the abnormality, the nut automatic feeding mechanism is used to sequentially convey the nut and screw it into the screw of the caster bracket, the roller automatic feeding mechanism is used to convey the roller to the installation position in the caster bracket, the automatic riveting mechanism is used to convey the rivet and rivet the roller on the caster bracket, and the conveying track is used to support the caster bracket that is positioned and conveyed during the assembly process. The invention can efficiently and automatically complete the assembly of ox-horn wheels, with high assembly efficiency and stable and consistent assembly quality.

Description

Technical Field

[0001] The invention relates to the technical field of caster production equipment, in particular to an automatic assembling machine for ox-horn casters. Background Art

[0002] Casters are common mechanical parts, widely used in industry and daily life. There is a great demand for various types of casters. In order to improve the production efficiency of casters, many manufacturers in this industry, including the applicant, are constantly developing and improving caster automation production equipment.

[0003] There are some automatic assembly equipment for the production of conventional casters on the market, but for a type of ox-horn caster, since its support shaft and the center of the roller are not on the same axis, and its two supporting feet are approximately in the shape of bent ox horns, it is very difficult to automatically convey, position, clamp and assemble each part. There is no suitable automatic assembly equipment in the prior art, and manual assembly is still the main method. The manual assembly efficiency is low, and the quality of manually assembled casters is relatively unstable. Therefore, the applicant developed automatic assembly equipment suitable for the production of ox-horn casters according to market needs. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an automatic assembly machine for bull horn wheels, which includes assembly processes such as automatic transportation, positioning, nut screwing, automatic riveting, etc. of various components, and can efficiently and automatically complete the assembly of bull horn wheels with high assembly efficiency and stable and consistent assembly quality.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A kind of automatic assembly machine of ox-horn wheels, including a caster bracket input mechanism, a caster bracket step moving mechanism, a caster bracket rotation detection mechanism, a nut automatic feeding mechanism, a roller automatic feeding mechanism, an automatic riveting mechanism, a conveying track and an installation frame, wherein the caster bracket input mechanism is used to input the caster bracket assembled in the previous process, the caster bracket step moving mechanism is used to position and transmit the caster bracket in sequence between the aforementioned mechanisms, the caster bracket rotation detection mechanism is used to detect whether the input caster bracket rotates abnormally and eliminate the abnormality, the nut automatic feeding mechanism is used to convey the nuts in sequence and screw them into the screw of the caster bracket, the roller automatic feeding mechanism is used to convey the roller to the installation position in the caster bracket, the automatic riveting mechanism is used to convey rivets and rivet the roller on the caster bracket, the conveying track is used to support the caster bracket that is positioned and conveyed during the assembly process, and the installation frame is used to fix and install the aforementioned mechanism.

[0007] Furthermore, the step moving mechanism of the caster bracket includes a fork component, a left-right moving component and a front-and-back moving component, the fork component is provided with a row of slots for clamping the movable caster bracket, the fork component is installed on the left-and-right moving component, the left-and-right moving component is installed on the front-and-back moving component, the left-and-right moving component is provided with a left-and-right moving cylinder, and the front-and-back moving component is provided with a front-and-back moving cylinder.

[0008] Furthermore, the caster bracket rotation detection mechanism includes a clamping component capable of clamping the upper part of the caster bracket, the clamping component is provided with a clamping cylinder and a clamping claw, the clamping component is arranged on a rotating component, the rotating component is arranged on a lifting component, and the lifting component is further arranged on a defective product discharge component, and the lifting component and the defective product discharge component are respectively provided with a driving cylinder.

[0009] Furthermore, the rotating component is provided with a rotating support shaft, a driven wheel, a driving wheel and a rotating drive motor. The rotating support shaft is rotatably fixed on the lifting component. The rotating drive motor drives the rotating support shaft to rotate through the driving wheel and the driven wheel. The rotating support shaft is provided with a rotation angle detection disk.

[0010] Furthermore, the automatic nut feeding mechanism includes an automatic nut conveying vibration plate and a linear vibration slide, the outlet of the linear vibration slide is connected to the nut pushing component, the nut pushing component is provided with a pushing slide and a pushing cylinder, the outlet of the pushing slide is connected to the nut tightening shaft, the nut tightening shaft is provided with a positioning groove for placing the nut, the lower end of the nut tightening shaft is connected to the servo drive motor through a coupling, and the servo drive motor is installed and fixed on the pneumatic lifting platform.

[0011] Furthermore, the automatic roller feeding mechanism includes a roller conveyor belt, a roller grabbing and shifting component and a roller grabbing and upright placing component. The roller conveyor belt is used to arrange and convey rollers. The roller grabbing and shifting component is provided with a horizontal moving cylinder, a vertical lifting cylinder, a roller clamping cylinder and a roller clamping claw. The roller grabbing and upright placing component is provided with a rotating cylinder, a telescopic cylinder, a roller upright clamping cylinder and a roller upright clamping claw. A transition clamp is provided between the roller grabbing and shifting component and the roller grabbing and upright placing component. The roller grabbing and shifting component grabs the roller input by the roller conveyor belt and places it on the transition clamp. The roller grabbing and upright placing component grabs the roller placed on the transition clamp, flips it 90 degrees and upright it, and then transports it to the installation position of the caster bracket.

[0012] Furthermore, the automatic riveting mechanism includes a rivet conveying component, an automatic riveting component and a riveting pressing component. The rivet conveying component is provided with a rivet conveying clamp connected to an external rivet automatic supply device. The automatic riveting component is provided with an automatic riveting device and an extended riveting rod arranged at the output end of the automatic riveting device. The front end head of the extended riveting rod passes through the rivet conveying clamp to press the rivet into the axial hole of the caster bracket and the roller. The riveting pressing pressing component presses the rivet end on the other side of the caster bracket. The riveting pressing pressing component cooperates with the automatic riveting component to rivet the caster bracket and the roller together using rivets.

[0013] Furthermore, a steel ball rotating bearing is provided in the caster bracket of the caster bracket input mechanism input.

[0014] Furthermore, the caster bracket input mechanism, the caster bracket step moving mechanism, the caster bracket rotation detection mechanism, the nut automatic feeding mechanism, the roller automatic feeding mechanism and the automatic riveting mechanism are connected to the controller control, and the controller controls the caster bracket input mechanism, the caster bracket step moving mechanism, the caster bracket rotation detection mechanism, the nut automatic feeding mechanism, the roller automatic feeding mechanism and the automatic riveting mechanism to automatically operate according to the assembly sequence.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention realizes automatic assembly such as automatic conveying and positioning of the caster bracket, automatic conveying and screwing of the nut, automatic conveying and automatic riveting of the roller, etc. by setting a special caster bracket input mechanism, a caster bracket step moving mechanism, a caster bracket rotation detection mechanism, an automatic nut feeding mechanism, an automatic roller feeding mechanism, an automatic riveting mechanism and a conveying track. It can efficiently and automatically complete the assembly of the horn wheel, with high assembly efficiency and stable and consistent assembly quality.

[0017] 2. The step moving mechanism of the caster bracket of the present invention continuously moves the conveying caster bracket back and forth on the conveying track. The caster bracket continuously slides forward according to the spacing under the support of the conveying track, and can accurately position and convey the caster bracket in sequence between various mechanisms, and can accurately convey it into place to ensure smooth assembly.

[0018] 3. The caster bracket rotation detection mechanism of the present invention can detect whether the input caster bracket rotates abnormally through the rotation angle, and can clamp and discharge the caster bracket with abnormal rotation out of the production line to prevent defective products from continuing to be assembled downward.

[0019] 4. The automatic nut feeding mechanism of the present invention can automatically convey the nuts to the nut tightening shaft in sequence, and screw the nuts into the screw of the caster bracket through the nut tightening shaft connected to the servo drive motor. The nuts are screwed accurately and in place, and the assembly is stable and reliable.

[0020] 5. The automatic roller feeding mechanism of the present invention can accurately grab the roller and place it on the installation position of the caster bracket. When grabbing, the roller is flipped 90 degrees from flat to upright, and the flat input of the roller is convenient for stable transportation; the automatic riveting mechanism can accurately transport the rivets to the installation position, and can reliably rivet the caster bracket and the roller together. After riveting, the roller and the caster bracket are firmly connected, and the roller and the caster bracket can maintain free rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the automatic assembly machine of the ox-horn wheel of the present invention;

[0022] Figure 2 It is a three-dimensional schematic diagram of the automatic assembly machine of horn wheels of the present invention in another direction after the frame is removed;

[0023] Figure 3 It is a three-dimensional schematic diagram of the step moving mechanism of the caster bracket of the present invention;

[0024] Figure 4 It is a three-dimensional schematic diagram of the caster bracket rotation detection mechanism of the present invention;

[0025] Figure 5 It is a three-dimensional schematic diagram of the automatic nut feeding mechanism of the present invention;

[0026] Figure 6 It is a three-dimensional schematic diagram of the roller automatic feeding mechanism of the present invention;

[0027] Figure 7 It is a three-dimensional schematic diagram of the automatic riveting mechanism of the present invention.

[0028] Description of reference numerals:

[0029] 1. Caster bracket input mechanism; 2. Caster bracket step moving mechanism; 21. Fork component; 211. Card slot; 22. Left and right moving component; 221. Left and right moving cylinder; 23. Forward and backward moving component; 231. Forward and backward moving cylinder; 3. Caster bracket rotation detection mechanism; 31. Clamping component; 32. Rotating component; 321. Support shaft; 322. Driven wheel; 323. Driving wheel; 324. Rotating drive motor; 325. Rotation angle detection plate; 33. Lifting component; 34. Defective product discharge component; 4. Nut automatic feeding mechanism; 41. Nut automatic conveying vibration plate; 42. Linear vibration slide; 43. Nut pushing component; 431. Pushing slide; 432. Pushing cylinder; 44. Nut tightening shaft; 441. Fixed Position slot; 45, servo drive motor; 46, pneumatic lifting platform; 5, roller automatic feeding mechanism; 51, roller conveyor belt; 52, roller grabbing and shifting component; 521, horizontal moving cylinder; 522, vertical lifting cylinder; 523, roller clamping cylinder; 524, roller clamping claw; 53, roller grabbing and upright placement component; 531, rotating cylinder; 532, telescopic cylinder; 533, roller upright clamping cylinder; 534, roller upright clamping claw; 54, transition fixture; 6, automatic riveting mechanism; 61, rivet conveying component; 611, rivet conveying nozzle; 62, automatic riveting component; 621, automatic riveting device; 622, extended riveting rod; 63, riveting and tightening component; 7, conveying track; 8, mounting rack; 9, caster bracket. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] See also Figure 1-7 As shown, an automatic assembly machine for ox-horn wheels includes a caster bracket input mechanism 1, a caster bracket step moving mechanism 2, a caster bracket rotation detection mechanism 3, a nut automatic feeding mechanism 4, a roller automatic feeding mechanism 5, an automatic riveting mechanism 6, a conveying track 7 and an installation frame 8, wherein the caster bracket input mechanism 1 is used to input the caster bracket 9 assembled in the previous process, the caster bracket step moving mechanism 2 is used to sequentially position and transmit the caster bracket 9 between the aforementioned mechanisms, the caster bracket rotation detection mechanism 3 is used to detect whether the input caster bracket 9 rotates abnormally and eliminate the abnormality, the nut automatic feeding mechanism 4 is used to sequentially convey the nut and screw it into the screw of the caster bracket 9, the roller automatic feeding mechanism 5 is used to convey the roller to the installation position in the caster bracket 9, the automatic riveting mechanism 6 is used to convey rivets and rivet the roller on the caster bracket 9, the conveying track 7 is used to support the caster bracket 9 positioned and conveyed during the assembly process, and the installation frame 8 is used to fix and install the aforementioned mechanisms. The caster bracket 9 input by the caster bracket input mechanism 1 is provided with a steel ball rotating bearing. The caster bracket input mechanism 1 is provided with a grabbing clamp and a transport moving part.

[0032] The caster bracket step moving mechanism 2 includes a fork component 21, a left-right moving component 22 and a front-back moving component 23. The fork component 21 is provided with a row of slots 211 for clamping the movable caster bracket 9. The slots 211 are arranged in a slot plate of a split structure. A plurality of slot plates are arranged in a row on a mounting truss. The fork component 21 is installed on the left-right moving component 22. The left-right moving component 22 is installed on the front-back moving component 23. The left-right moving component 22 is provided with a left-right moving cylinder 221. The front-back moving component 23 is provided with a front-back moving cylinder 231. Guide rails can also be added to the components to ensure movement accuracy.

[0033] The caster bracket rotation detection mechanism 3 includes a clamping component 31 capable of clamping the upper part of the caster bracket 9, and the clamping component 31 is provided with a clamping cylinder and a clamping claw, and the clamping component 31 is provided on a rotating component 32, and the rotating component 32 is provided on a lifting component 33, and the lifting component 33 is further provided on a defective product discharge component 34, and a driving cylinder is provided in each of the lifting component 33 and the defective product discharge component 34. The rotating component 32 is provided with a rotating support shaft 321, a driven wheel 322, a driving wheel 323 and a rotating driving motor 324, and the rotating support shaft 321 is rotatably fixed on the lifting component 33, and the rotating driving motor 324 drives the rotating support shaft 321 to rotate through the driving wheel 323 and the driven wheel 322, and a rotation angle detection disk 325 is provided on the rotating support shaft 321. In order to prevent the screw in the caster bracket 9 from rotating along with the rotating component 32 during the rotation process, an auxiliary clamping mechanism can be provided at the bottom of the conveying track 7 corresponding to the caster bracket rotation detection mechanism 3 to clamp the screw in the caster bracket 9 .

[0034] The automatic nut feeding mechanism 4 includes an automatic nut conveying vibration plate 41 and a linear vibration slide 42, the outlet of the linear vibration slide 42 is connected to a nut pushing component 43, a pushing slide 431 and a pushing cylinder 432 are provided in the nut pushing component 43, the outlet of the pushing slide 431 is connected to a nut tightening shaft 44, a positioning groove 441 for placing nuts is provided on the nut tightening shaft 44, the lower end of the nut tightening shaft 44 is connected to a servo drive motor 45 through a coupling, and the servo drive motor 45 is installed and fixed on a pneumatic lifting platform 46.

[0035] The roller automatic feeding mechanism 5 comprises a roller conveyor belt 51, a roller grabbing and shifting component 52 and a roller grabbing and upright placing component 53. The roller conveyor belt 51 is used to arrange the conveying rollers. The roller grabbing and shifting component 52 is provided with a horizontal moving cylinder 521, a vertical lifting cylinder 522, a roller clamping cylinder 523 and a roller clamping claw 524. The roller grabbing and upright placing component 53 is provided with a rotating cylinder 531, a telescopic cylinder 532, a roller The wheel upright clamping cylinder 533 and the roller upright clamping claw 534, a transition clamp 54 is provided between the roller grabbing and shifting component 52 and the roller grabbing and upright placing component 53, the roller grabbing and shifting component 52 grabs the roller input by the roller conveyor belt 51 and places it on the transition clamp 54, the roller grabbing and upright placing component 53 grabs the roller placed on the transition clamp 54, flips it 90 degrees and upright it, and then transports it to the installation position of the caster bracket 9.

[0036] The automatic riveting mechanism 6 includes a rivet conveying component 61, an automatic riveting component 62 and a riveting pressing component 63. The rivet conveying component 61 is provided with a rivet conveying nozzle 611 connected to an external rivet automatic supply device. The automatic riveting component 62 is provided with an automatic riveting device 621 and an extended riveting rod 622 arranged at the output end of the automatic riveting device 621. The front end of the extended riveting rod 622 passes through the rivet conveying nozzle 611 to press the rivet into the axial hole of the caster bracket 9 and the roller. The riveting pressing component 63 presses the rivet end on the other side of the caster bracket 9. The riveting pressing component 63 cooperates with the automatic riveting component 62 to rivet the caster bracket 9 and the roller together using rivets. The rivet automatic supply device and the automatic riveting device 621 are purchased commercially. The riveting pressing component 63 is provided with a tightening cylinder, a guide rail, a riveting pressing rod and other structures.

[0037] The caster bracket input mechanism 1, the caster bracket step moving mechanism 2, the caster bracket rotation detection mechanism 3, the nut automatic feeding mechanism 4, the roller automatic feeding mechanism 5 and the automatic riveting mechanism 6 are connected to the controller control, and the controller controls the caster bracket input mechanism 1, the caster bracket step moving mechanism 2, the caster bracket rotation detection mechanism 3, the nut automatic feeding mechanism 4, the roller automatic feeding mechanism 5 and the automatic riveting mechanism 6 to automatically operate according to the assembly sequence.

[0038] The specific connection and installation of pneumatic mechanisms such as the caster bracket input mechanism 1, the caster bracket step moving mechanism 2, the caster bracket rotation detection mechanism 3, the nut automatic feeding mechanism 4, the roller automatic feeding mechanism 5 and the automatic riveting mechanism 6 in this embodiment, as well as the installation and connection structures of the servo drive motor, conveyor belt, drive wheel, and the pneumatic and electrical controls involved are all conventional designs by technicians in the field of special equipment and non-standard equipment, and some auxiliary structures not described can be known from the accompanying drawings.

[0039] When the present invention is used, after starting the equipment, under the control of the controller, the caster bracket input mechanism 1 places the caster bracket 9 assembled in the previous process onto the conveying track 7, and the caster bracket step moving mechanism 2 continuously reciprocates to transfer the caster bracket 9, and the caster bracket 9 continuously slides forward on the conveying track 7. When the caster bracket 9 reaches the position of the caster bracket rotation detection mechanism 3, the caster bracket rotation detection mechanism 3 descends and clamps the caster bracket 9 for rotation. The caster bracket 9 that has passed the rotation continues to move down on the conveying track 7, and the caster bracket 9 that has failed the rotation is clamped by the caster bracket rotation detection mechanism 3. The nut is automatically fed into the caster bracket 9 and then discharged to the outside of the conveyor track 7 for collection; when the caster bracket 9 moves to the position of the nut automatic feeding mechanism 4, the nut automatic feeding mechanism 4 automatically screws the nut into the screw of the caster bracket 9 from bottom to top; when the caster bracket 9 moves to the position of the roller automatic feeding mechanism 5, the roller automatic feeding mechanism 5 grabs the roller and places it at the installation position of the caster bracket 9, and then the automatic riveting mechanism 6 can accurately transport the rivet to the installation position, and can reliably rivet the caster bracket 9 and the roller together, and the caster is collected after the riveting is completed, and the sequential operation is continuously carried out for efficient automatic assembly.

[0040] The above description is only a specific implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic assembly machine for horn wheels, characterized in that: The invention comprises a caster bracket input mechanism (1), a caster bracket step moving mechanism (2), a caster bracket rotation detection mechanism (3), a nut automatic feeding mechanism (4), a roller automatic feeding mechanism (5), an automatic riveting mechanism (6), a conveying track (7) and an installation frame (8), wherein the caster bracket input mechanism (1) is used to input a caster bracket (9) assembled in a previous process, the caster bracket step moving mechanism (2) is used to position and transfer the caster bracket (9) in sequence between the aforementioned mechanisms, the caster bracket rotation detection mechanism (3) is used to detect whether the input caster bracket (9) has abnormal rotation and remove the abnormal one, and the nut automatic feeding mechanism (4) is used to transfer the nut in sequence and screw it into the caster bracket. In the screw of the bracket (9), the automatic roller feeding mechanism (5) is used to transport the roller to the installation position in the caster bracket (9), the automatic riveting mechanism (6) is used to transport the rivet and rivet the roller on the caster bracket (9), the conveying track (7) is used to support the caster bracket (9) for positioning and transporting during the assembly process, and the mounting frame (8) is used to fix and install the above-mentioned mechanism; the caster bracket step moving mechanism (2) includes a fork component (21), a left and right moving component (22) and a front and back moving component (23), the fork component (21) is provided with a row of slots (211) for clamping and moving the caster bracket (9), and the fork component (21) is installed on the left and right moving component ( The left-right moving component (22) is mounted on a front-back moving component (23), a left-right moving cylinder (221) is provided in the left-right moving component (22), and a front-back moving cylinder (231) is provided in the front-back moving component (23); the caster bracket rotation detection mechanism (3) comprises a clamping component (31) capable of clamping the upper part of the caster bracket (9), a clamping cylinder and a clamping claw are provided in the clamping component (31), the clamping component (31) is provided on a rotating component (32), the rotating component (32) is provided on a lifting component (33), the lifting component (33) is further provided on a defective product discharge component (34), the lifting component (33) and the defective product discharge component (34) are connected to each other. The nut automatic feeding mechanism (4) comprises a nut automatic conveying vibration plate (41) and a linear vibration slideway (42), the outlet of the linear vibration slideway (42) is connected to a nut pushing component (43), the nut pushing component (43) is provided with a pushing slideway (431) and a pushing cylinder (432), the outlet of the pushing slideway (431) is connected to a nut tightening shaft (44), the nut tightening shaft (44) is provided with a positioning groove (441) for placing the nut, the lower end of the nut tightening shaft (44) is connected to a servo drive motor (45) through a coupling, and the servo drive motor (45) is installed and fixed on a pneumatic lifting platform (46);The roller automatic feeding mechanism (5) comprises a roller conveyor belt (51), a roller grabbing and shifting component (52) and a roller grabbing and upright placement component (53); the roller conveyor belt (51) is used to arrange the conveying rollers; the roller grabbing and shifting component (52) is provided with a horizontal moving cylinder (521), a vertical lifting cylinder (522), a roller clamping cylinder (523) and a roller clamping claw (524); the roller grabbing and upright placement component (53) is provided with A rotating cylinder (531), a telescopic cylinder (532), a roller upright clamping cylinder (533) and a roller upright clamping claw (534); a transition clamp (54) is provided between the roller grabbing and shifting component (52) and the roller grabbing and upright placing component (53); the roller grabbing and shifting component (52) grabs and places the roller input from the roller conveyor belt (51) on the transition clamp (54); and the roller grabbing and upright placing component (53) grabs and places the roller input from the roller conveyor belt (51) on the transition clamp (54). The roller placed on the clamp (54) is grasped, turned 90 degrees and erected, and then transported to the installation position of the caster bracket (9); the automatic riveting mechanism (6) includes a rivet conveying component (61), an automatic riveting component (62) and a riveting pressing component (63); the rivet conveying component (61) is provided with a rivet conveying clamp (611) connected to an external rivet automatic supply device; the automatic riveting component (62) is provided with an automatic riveting device (621) and a setting An extended riveting rod (622) at the output end of the automatic riveting device (621) has its front end passed through the rivet delivery clamp (611) to press the rivet into the shaft hole of the caster bracket (9) and the roller, and the riveting pressing component (63) presses the rivet end on the other side of the caster bracket (9). The riveting pressing component (63) cooperates with the automatic riveting component (62) to rivet the caster bracket (9) and the roller together using rivets.

2. The automatic assembly machine for horn wheels according to claim 1, characterized in that: The rotating component (32) is provided with a rotating support shaft (321), a driven wheel (322), a driving wheel (323) and a rotating drive motor (324); the rotating support shaft (321) is rotatably fixed on the lifting component (33); the rotating drive motor (324) drives the rotating support shaft (321) to rotate via the driving wheel (323) and the driven wheel (322); and a rotation angle detection disk (325) is provided on the rotating support shaft (321).

3. The automatic assembly machine for horn wheels according to claim 1, characterized in that: A steel ball rotary bearing is provided in the caster bracket (9) input by the caster bracket input mechanism (1).

4. The automatic assembly machine for horn wheels according to claim 1, characterized in that: The caster bracket input mechanism (1), the caster bracket step moving mechanism (2), the caster bracket rotation detection mechanism (3), the nut automatic feeding mechanism (4), the roller automatic feeding mechanism (5) and the automatic riveting mechanism (6) are connected to the controller for control. The controller controls the caster bracket input mechanism (1), the caster bracket step moving mechanism (2), the caster bracket rotation detection mechanism (3), the nut automatic feeding mechanism (4), the roller automatic feeding mechanism (5) and the automatic riveting mechanism (6) to automatically operate according to the assembly sequence.

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