A material returning mechanism for a vehicle bottom trimming device

Abstract

The application discloses a material returning mechanism for a vehicle bottom jointing equipment and belongs to the technical field of automatic mechanical machining equipment. The material returning mechanism comprises a base, the top end face of the base is fixedly connected with a concave plate, one side face of the concave plate is rotationally connected with a rotary disc, one side face of the rotary disc is provided with six uniformly distributed headstocks, and the side face of each headstock is provided with a clamping groove matched with a product; the other side face of the concave plate is fixedly connected with a material returning cylinder near the upper position, the output shaft of the material returning cylinder is fixedly connected with a strip-shaped plate, one side face of the strip-shaped plate is fixedly connected with two push rods, the two push rods are respectively matched with the clamping grooves of the two headstocks, and the push rods can penetrate through the concave plate and the headstocks to push out the product in the clamping groove; the base is internally provided with a placing groove, the placing groove is provided with a material receiving and buffering assembly, and a dustproof and cleaning assembly is arranged between the concave plate and the push rods. The material returning mechanism can realize double-station synchronous material returning and improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of automated machining equipment technology, specifically a material unloading mechanism for a machine bottom edge trimming device. Background Technology

[0002] The bottom-cutting machine is an automated special-purpose machine tool used for cutting, flattening and chamfering the bottom of cylindrical or cup-shaped products (such as cartridge cases, metal sleeves, etc.). This type of equipment is widely used in military, aerospace, automotive parts and precision hardware manufacturing and other fields. Its main functions include: (1) bottom-cutting: cutting the bottom of the product to ensure that the bottom plane is flat and the thickness is uniform; (2) chamfering: chamfering or flattening the end face of the product to meet the assembly or use requirements; (3) automated loading and unloading: realizing the automatic material handling, conveying, positioning, processing and unloading of products, improving production efficiency.

[0003] In the process flow of the undercarriage finishing equipment, after the products undergo turning, chamfering, and other processes, they need to be quickly and accurately ejected from the mold station on the rotary table and fed into the unloading system for collection. However, traditional unloading mechanisms cannot achieve simultaneous unloading at two stations, resulting in low production efficiency.

[0004] Therefore, those skilled in the art have provided a material unloading mechanism for a car bottom trimming device to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a material unloading mechanism for a car bottom trimming machine, which can realize synchronous material unloading at two workstations, improve production efficiency, and solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A material ejection mechanism for a car bottom trimming device includes a base, a concave plate fixedly connected to one side of the top surface of the base, and a rotary table rotatably connected to one side of the concave plate. The rotary table has six evenly distributed car head seats on one side, and a slot matching the product is opened at the center of the side of the car head seat.

[0008] A material ejector cylinder is fixedly connected to the other side of the concave plate near the top, and the output shaft of the material ejector cylinder is fixedly connected to a strip plate. Two push rods are fixedly connected to one side of the strip plate. The two push rods correspond to the slots of the two headstocks respectively, and the push rods can pass through the concave plate and the headstock to push the product out of the slot.

[0009] The base has an internal placement slot, and the placement slot is equipped with a material receiving buffer component. A dustproof and cleaning component is provided between the concave plate and the push rod.

[0010] As a further aspect of the present invention: a support frame is fixedly connected to the other side of the top surface of the base, and a first feeding track and a second feeding track are fixedly connected to the top of the support frame. The top openings of the first feeding track and the second feeding track respectively connect to the slots corresponding to the two push rods, and a receiving box is provided below the bottom openings of the first feeding track and the second feeding track.

[0011] As a further embodiment of the present invention: the receiving buffer assembly specifically includes: two lead screw seats fixedly mounted side by side on the bottom end face of the placement trough, a transmission lead screw movably connected between the two lead screw seats, and a threaded seat movably connected to the outside of the transmission lead screw, a fixed seat fixedly connected to the top surface of the threaded seat, and two parallel crossbars fixedly connected to one side of the fixed seat, a stepper motor embedded at the end of the crossbars, and a rotating seat fixedly connected to the output shaft of the stepper motor, the two rotating seats being on the same vertical plane as the bottom openings of the first and second feeding tracks, respectively, and a receiving sleeve fixedly connected to one side of the rotating seat, a rotary motor fixedly connected to one side of the bottom end face of the placement trough, and the output shaft of the rotary motor fixedly connected to one end of the transmission lead screw, with limiting members provided on both sides of the transmission lead screw.

[0012] As a further embodiment of the present invention: the limiting component specifically includes: limiting optical shafts fixed on both sides of the transmission screw, triangular seats fixedly connected to both sides of the bottom end face of the threaded seat, and three movable rollers embedded inside the triangular seats, the two limiting optical shafts passing through the two triangular seats respectively and being movably connected to them, wherein two of the rollers are located above the corresponding limiting optical shafts, and the other roller is located below the corresponding limiting optical shaft.

[0013] As a further embodiment of the present invention: the dustproof cleaning component specifically includes: a fixing plate fixed to the other side of the concave plate; a support plate fixedly connected to the middle position of the bottom end face of the fixing plate; a guide sleeve embedded inside the support plate; a limiting ring fixedly connected to one side of the support plate; a support cylinder fixedly connected to one end of the limiting ring; a baffle fixedly connected to one end of the support cylinder; a dust cover fixedly connected to one side of the baffle; and a push rod passing through the dust cover, the baffle, the support cylinder, the limiting ring, and the guide sleeve, with the support cylinder being movable externally. A tapered sleeve is connected to the support plate, and a driving mechanism is provided on the other side of the support plate to drive the tapered sleeve to move back and forth. At least four evenly distributed slots are opened on the outer side of the support sleeve, and an arc plate that matches it is movably connected inside the slot. An arc-shaped frosted plate is fixedly connected to one end of the arc plate near the inside of the support sleeve, and an inclined surface is provided at the other end of the arc plate. When the four arc plates are closed, they can form a ring that matches the push rod. An anti-detachment component is provided between the arc plate and the slot. The arc plate is in a loose state in the initial state.

[0014] As a further embodiment of the present invention: the driving mechanism specifically includes: three telescopic motors uniformly fixed on the other side of the support plate, the output shafts of the three telescopic motors are jointly fixedly connected to a moving ring, and three uniformly distributed transmission rods are fixedly connected to one side of the moving ring, the three transmission rods pass through the support plate and are jointly fixedly connected to a support ring, and the support ring is fixedly connected to a conical sleeve.

[0015] As a further embodiment of the present invention: the anti-detachment component specifically includes: anti-detachment blocks fixed on both sides of the arc-shaped plate, and an anti-detachment groove is provided on the inner wall of the slot corresponding to the position of the anti-detachment block, and the anti-detachment block is movably connected inside the anti-detachment groove and matches it.

[0016] As a further embodiment of the present invention: a drive motor is fixedly connected to the other side of the concave plate at the position corresponding to the rotary table, and the output shaft of the drive motor passes through the concave plate and is fixedly connected to the rotary table.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The material unloading mechanism for the undercarriage trimming equipment provided by this invention, by integrating modules such as material receiving buffer, dust prevention and cleaning, and diversion of material unloading, brings several significant benefits: First, it effectively reduces the risk of impact damage to products during the unloading and falling process, improving the final product quality and pass rate; Second, through automatic cleaning of the push rod and physical diversion of products, it significantly reduces equipment failures and production interruptions caused by contamination and mixing, improving the stability of equipment operation and production efficiency; Third, the overall structure is compact and highly automated, which not only facilitates integration into automated production lines but also greatly reduces the frequency and difficulty of manual maintenance, comprehensively improving the intelligence level and economic benefits of the undercarriage trimming equipment. Attached Figure Description

[0019] Figure 1 A schematic diagram of the material unloading mechanism for a car bottom trimming device;

[0020] Figure 2 This is a side view of a material unloading mechanism for a car bottom trimming device;

[0021] Figure 3 This is a view showing the connection between the transmission screw and the fixed seat in the unloading mechanism of a car bottom trimming device;

[0022] Figure 4 This is a combined view of a stepper motor and a rotary seat in an unloading mechanism for a car bottom trimming device;

[0023] Figure 5 This is a combined view of the ejector cylinder and the strip plate in the ejector mechanism of a car bottom trimming device;

[0024] Figure 6 This is a schematic diagram of the dustproof and cleaning component in the material unloading mechanism of a car bottom trimming device;

[0025] Figure 7 This is a side view of a dustproof and cleaning component in a material unloading mechanism for a car bottom flushing device;

[0026] Figure 8 This is a combined view of the arc plate and the slot in the unloading mechanism of a car bottom flushing device.

[0027] In the diagram: 1. Base; 2. Concave plate; 3. Turntable; 4. Headstock; 5. Drive motor; 6. First feeding track; 7. Second feeding track; 8. Support frame; 9. Unloading cylinder; 10. Strip plate; 11. Push rod; 12. Fixing plate; 13. Support plate; 14. Guide sleeve; 15. Moving ring; 16. Telescopic motor; 17. Transmission rod; 18. Limiting ring; 19. Support cylinder; 20. Support ring; 21. Conical sleeve; 22. Baffle plate; 23. Dust cover; 24. Curved plate; 25. Groove; 26. Anti-detachment groove; 27. Anti-detachment block; 28. Curved frosted plate; 29. ​​Receiving box; 30. Placement groove; 31. Rotary motor; 32. Lead screw seat; 33. Transmission lead screw; 34. Limiting optical shaft; 35. Triangular seat; 36. Roller; 37. Threaded seat; 38. Fixed seat; 39. Crossbar; 40. Stepper motor; 41. Rotary seat; 42. Receiving sleeve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] As mentioned in the background section of this application, research has revealed that in the existing process flow of underbody finishing equipment, after the product undergoes turning, chamfering, and other processes, it needs to be quickly and accurately ejected from the mold station on the rotary table 3 and fed into the unloading system for collection. However, traditional unloading mechanisms cannot achieve simultaneous unloading at two stations, resulting in low production efficiency and certain defects.

[0030] To address the aforementioned shortcomings, this application discloses a material unloading mechanism for a car bottom trimming machine, which enables simultaneous material unloading at two workstations, thereby improving production efficiency.

[0031] The following will describe in detail, with reference to the accompanying drawings, how the solution of this application solves the above-mentioned technical problems.

[0032] Please see Figures 1-8In this embodiment of the invention, a material ejection mechanism for a car bottom trimming device includes a base 1. A concave plate 2 is fixedly connected to one side of the top surface of the base 1, and a turntable 3 is rotatably connected to one side of the concave plate 2. Six evenly distributed car head seats 4 are provided on one side of the turntable 3, and a slot matching the product is opened at the center of the side of the car head seat 4. A material ejection cylinder 9 is fixedly connected to the other side of the concave plate 2 near the top, and a strip plate 10 is fixedly connected to the output shaft of the material ejection cylinder 9. Two push rods 11 are fixedly connected to one side of the strip plate 10. The two push rods 11 correspond to the slots of the two car head seats 4 respectively, and the push rods 11 can penetrate the concave plate 2 and the car head seat 4 to push the product out of the slot. A placement groove 30 is opened inside the base 1, and a material receiving buffer assembly is provided in the placement groove 30. A dustproof and cleaning assembly is provided between the concave plate 2 and the push rods 11. This application utilizes a rotary table 3 and a headstock 4 mounted on a base 1 to achieve the flow and positioning of multi-station products. A push rod 11 driven by a ejector cylinder 9 precisely and efficiently ejects the finished products from the headstock 4. Simultaneously, an integrated receiving buffer assembly flexibly catches falling products, preventing damage from impact. A dustproof cleaning component automatically cleans contaminants adhering to the push rod 11's surface as it retracts, preventing contaminants from entering the mold area and ensuring the long-term stability of the equipment and the cleanliness of the products.

[0033] In this embodiment, a support frame 8 is fixedly connected to the other side of the top surface of the base 1, and a first unloading track 6 and a second unloading track 7 are fixedly connected to the top of the support frame 8. The top openings of the first unloading track 6 and the second unloading track 7 respectively connect to the corresponding slots of the two push rods 11, and a receiving box 29 is provided below the bottom opening of both the first unloading track 6 and the second unloading track 7. By setting the first unloading track 6 and the second unloading track 7, the returned products from different workstations are physically diverted and respectively guided into independent receiving boxes 29. This design realizes the differentiated management of the products processed by the two sets of machine heads, which facilitates the rapid traceability and isolation of product quality problems occurring in specific workstations during the production process, and greatly improves the refinement of production management and the efficiency of fault diagnosis.

[0034] In this embodiment, the receiving buffer assembly specifically includes: two lead screw seats 32 fixedly arranged side by side on the bottom surface of the placement groove 30, a transmission lead screw 33 movably connected between the two lead screw seats 32, and a threaded seat 37 movably connected to the outside of the transmission lead screw 33. A fixed seat 38 is fixedly connected to the top surface of the threaded seat 37, and two parallel crossbars 39 are fixedly connected to one side of the fixed seat 38. A stepper motor 40 is embedded at the end of the crossbar 39, and a rotating seat 41 is fixedly connected to the output shaft of the stepper motor 40. The two rotating seats 41 are respectively on the same vertical plane as the bottom openings of the first feeding track 6 and the second feeding track 7. A receiving sleeve 42 is fixedly connected to one side of the rotating seat 41. A rotary motor 31 is fixedly connected to one side of the bottom surface of the placement groove 30, and the output shaft of the rotary motor 31 is fixedly connected to one end of the transmission lead screw 33. Limiting members are provided on both sides of the transmission lead screw 33. This setup enables automated adjustment of the receiving position and flexible material receiving. A rotary motor 31 drives a lead screw system to precisely control the horizontal position of the receiving sleeve 42, ensuring it accurately aligns with the unloading track outlet. Meanwhile, a stepper motor 40 drives a rotating base 41, which adjusts the angle of the receiving sleeve 42. This not only allows it to vertically receive falling products but also provides angle adjustment during the product placement process, preventing products from being concentrated in one area. The entire assembly acts as a dynamic buffer system, effectively absorbing the kinetic energy of falling products and preventing deformation or dimensional deviations caused by rigid collisions.

[0035] In this embodiment, the limiting components specifically include: limiting optical shafts 34 fixed on both sides of the transmission screw 33; triangular seats 35 fixedly connected to both sides of the bottom end face of the threaded seat 37; and three movable rollers 36 embedded inside the triangular seats 35. Two limiting optical shafts 34 pass through and are movably connected to the two triangular seats 35 respectively, with two rollers 36 positioned above the corresponding limiting optical shafts 34 and the other roller 36 positioned below the corresponding limiting optical shaft 34. This configuration provides high-precision linear guidance and stable support for the movement of the threaded seat 37. Through the cooperation between the limiting optical shafts 34 and the rollers 36 inside the triangular seats 35, it ensures that the threaded seat 37 moves smoothly under the drive of the transmission screw 33, without shaking or jamming. This "two above, one below" roller arrangement forms a stable clamping structure, effectively resisting torsional torque during operation, ensuring the positional accuracy of the receiving sleeve 42 and the reliability of the entire buffer assembly.

[0036] In this embodiment, the dustproof cleaning component specifically includes: a fixing plate 12 fixed on the other side of the concave plate 2; a support plate 13 fixedly connected to the middle position of the bottom end face of the fixing plate 12; a guide sleeve 14 embedded inside the support plate 13; a limiting ring 18 fixedly connected to one side of the support plate 13; a support cylinder 19 fixedly connected to one end of the limiting ring 18; a baffle 22 fixedly connected to one end of the support cylinder 19; a dustproof cover 23 fixedly connected to one side of the baffle 22; and a push rod 11 passing through the dustproof cover 23, the baffle 22, the support cylinder 19, the limiting ring 18, and the guide sleeve 14. A tapered sleeve 21 is movably connected, and a driving mechanism is provided on the other side of the support plate 13 to drive the tapered sleeve 21 to move back and forth. At least four evenly distributed slots 25 are opened on the outer side of the support cylinder 19, and matching arc-shaped plates 24 are movably connected inside the slots 25. One end of the arc-shaped plate 24 near the inside of the support cylinder 19 is fixedly connected to an arc-shaped abrasive plate 28, and the other end of the arc-shaped plate 24 has a slope. When the four arc-shaped plates 24 are closed, they form a ring that matches the push rod 11. An anti-detachment component is provided between the arc-shaped plate 24 and the slots 25, and the arc-shaped plate 24 is initially in a loose state. This design not only forms a physical barrier through structures such as the dust cover 23, preventing dust and debris from the processing area from adhering to the push rod 11 and being carried into the precision-fitted internal mechanism; it also allows the tapered sleeve 21 to drive the arc-shaped plates 24 to close, using the arc-shaped abrasive plate 28 on its inner side to scrape and polish the surface of the push rod 11, achieving automatic and efficient cleaning. This design ensures that the push rod 11 is always kept clean, maintains its motion accuracy, and reduces the daily maintenance requirements of the equipment.

[0037] In this embodiment, the driving mechanism specifically includes: three telescopic motors 16 evenly fixed on the other side of the support plate 13; the output shafts of the three telescopic motors 16 are jointly and fixedly connected to a moving ring 15; and three evenly distributed transmission rods 17 are fixedly connected to one side of the moving ring 15. The three transmission rods 17 pass through the support plate 13 and are jointly and fixedly connected to a support ring 20, which is fixedly connected to the conical sleeve 21. This arrangement synchronously integrates and transmits the power of the multiple telescopic motors 16 to drive the conical sleeve 21 to perform precise linear reciprocating motion. The linkage structure formed by the moving ring 15 and the transmission rods 17 ensures the consistency of the actions of the three telescopic motors 16, thereby enabling the conical sleeve 21 to smoothly and synchronously press or release each arc plate 24, achieving uniform cleaning of the push rod 11 circumferentially, and avoiding the jamming or incomplete cleaning problems that may be caused by single-point driving.

[0038] In this embodiment, the anti-detachment component specifically includes: anti-detachment blocks 27 fixed to both sides of the arc-shaped plate 24; an anti-detachment groove 26 is formed on the inner wall of the slot 25 corresponding to the position of the anti-detachment block 27; and the anti-detachment block 27 is movably connected inside the anti-detachment groove 26 and matches it. This arrangement ensures that the arc-shaped plate 24 will not accidentally detach from the support cylinder 19 when it makes a specified radial movement within the slot 25. The sliding fit design of the anti-detachment block 27 and the anti-detachment groove 26 provides reliable axial restraint while allowing the necessary movement space for the arc-shaped plate 24, ensuring the structural integrity and functional stability of the cleaning mechanism under long-term, high-frequency operation.

[0039] In this embodiment, a drive motor 5 is fixedly connected to the other side of the concave plate 2 at the position corresponding to the rotary table 3, and the output shaft of the drive motor 5 passes through the concave plate 2 and is fixedly connected to the rotary table 3. This configuration provides precise and controllable rotational power to the rotary table 3. Driven by the drive motor 5, the rotary table 3 can achieve high-precision indexing and positioning, ensuring that each headstock 4 can accurately stop at the predetermined workstations such as processing, inspection, and unloading. This is the core foundation for achieving high-cycle, high-precision automated operation of the equipment.

[0040] The working principle of this invention is as follows: When the rotary table 3 rotates, it carries the finished product (with the bottom edge trimmed) to the unloading station and positions it precisely. Then, the control system issues a command to start the unloading cylinder 9. The output shaft of the unloading cylinder 9 retracts, pulling the strip plate 10, which is fixedly connected to it, forward. The strip plate 10 drives the two push rods 11 on it to move forward synchronously. The push rods 11 pass through the through holes on the concave plate 2 and are precisely inserted into the corresponding slots of the headstock 4, smoothly and reliably ejecting the finished product from the slots.

[0041] The ejected products fall naturally under gravity, then enter either the first unloading track 6 or the second unloading track 7 located above the unloading station. The top openings of these two unloading tracks are precisely aligned with the positions of the two ejected products, ensuring that the products are successfully captured. Through these two independent tracks, products from different headstocks 4 (e.g., corresponding to stations 1, 3, and 5 and stations 2, 4, and 6) are physically separated, effectively preventing confusion between products from different stations.

[0042] The products falling from the bottom opening of the feeding track are received by the receiving buffer assembly. The core operation of this assembly is driven by a rotary motor 31, which drives the transmission screw 33 to rotate, causing the threaded seat 37 to move along the limiting optical axis 34, thereby adjusting the position of the entire receiving unit. The fixed seat 38 is connected to the rotating seat 41 via a crossbar 39. The stepper motor 40 can drive the rotating seat 41 to rotate, so that the receiving sleeve 42 is precisely aligned with the exit of the feeding track. The products finally fall into the receiving sleeve 42. This process, through fine-tuning of the position and the flexible design of the sleeve itself, effectively absorbs the impact energy of the falling products, achieving a soft landing. Finally, the products are guided into the receiving box 29 below for collection.

[0043] As the ejector cylinder 9 retracts the push rod 11, the dustproof cleaning assembly begins operation. The telescopic motor 16 starts, pushing the support ring 20 and the conical sleeve 21 fixed thereto backward via the moving ring 15 and transmission rod 17. The inner conical surface of the conical sleeve 21 presses against the inclined surface of the arc-shaped plate 24, forcing multiple arc-shaped plates 24 to overcome gaps and converge towards the center. After convergence, the arc-shaped abrasive plate 28 on the inner wall of the arc-shaped plate 24 tightly wraps around the push rod 11 passing through it, scraping and grinding away iron filings, oil stains, and other contaminants adhering to its surface as it retracts. After cleaning, the telescopic motor 16 drives the conical sleeve 21 backward, and the arc-shaped plate 24 returns to its initial loose state after losing pressure, preparing for the next cleaning cycle. Throughout the process, the dust cover 23 acts as a static barrier, preventing external dust from entering the mechanism.

[0044] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0045] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A material unloading mechanism for a car bottom trimming device, characterized in that, Includes a base (1), a concave plate (2) is fixedly connected to one side of the top surface of the base (1), and a turntable (3) is rotatably connected to one side of the concave plate (2). The turntable (3) has six evenly distributed head seats (4) on one side, and a slot matching the product is opened in the center of the side of the head seat (4). A material ejector cylinder (9) is fixedly connected to the other side of the concave plate (2) near the top, and a strip plate (10) is fixedly connected to the output shaft of the material ejector cylinder (9). Two push rods (11) are fixedly connected to one side of the strip plate (10). The two push rods (11) correspond to the slots of the two headstocks (4) respectively, and the push rods (11) can pass through the concave plate (2) and the headstock (4) to push the product out of the slot. The base (1) has a placement groove (30) inside, and a material receiving buffer assembly is provided in the placement groove (30). A dustproof and cleaning assembly is provided between the concave plate (2) and the push rod (11). A support frame (8) is fixedly connected to the other side of the top surface of the base (1), and a first feeding track (6) and a second feeding track (7) are fixedly connected to the top of the support frame (8). The top openings of the first feeding track (6) and the second feeding track (7) are respectively connected to the slots corresponding to the two push rods (11), and a receiving box (29) is provided below the bottom openings of the first feeding track (6) and the second feeding track (7). The receiving buffer assembly specifically includes: two lead screw seats (32) fixed side-by-side on the bottom surface of the placement groove (30), a transmission lead screw (33) movably connected between the two lead screw seats (32), and a threaded seat (37) movably connected to the outside of the transmission lead screw (33). A fixed seat (38) is fixedly connected to the top surface of the threaded seat (37), and two parallel crossbars (39) are fixedly connected to one side of the fixed seat (38). A stepper motor (40) is embedded at the end of the crossbar (39), and the stepper motor... The output shaft of the motor (40) is fixedly connected to a rotating seat (41). The two rotating seats (41) are respectively on the same vertical plane as the bottom openings of the first feeding track (6) and the second feeding track (7). A receiving sleeve (42) is fixedly connected to one side of the rotating seat (41). A rotary motor (31) is fixedly connected to one side of the bottom surface of the placement groove (30). The output shaft of the rotary motor (31) is fixedly connected to one end of the transmission screw (33). Both sides of the transmission screw (33) are provided with limiting members. The limiting component specifically includes: limiting optical shafts (34) fixed on both sides of the transmission screw (33); triangular seats (35) are fixedly connected to both sides of the bottom end face of the threaded seat (37); and three movable rollers (36) are embedded inside the triangular seats (35); two limiting optical shafts (34) pass through the two triangular seats (35) respectively and are movably connected to them; two rollers (36) are located above the corresponding limiting optical shafts (34); and the other roller (36) is located below the corresponding limiting optical shafts (34). The dustproof and cleaning assembly specifically includes: a fixing plate (12) fixed on the other side of the concave plate (2); a support plate (13) fixedly connected to the middle position of the bottom end face of the fixing plate (12); a guide sleeve (14) embedded inside the support plate (13); a limiting ring (18) fixedly connected to one side of the support plate (13); a support cylinder (19) fixedly connected to one end of the limiting ring (18); a baffle (22) fixedly connected to one end of the support cylinder (19); a dust cover (23) fixedly connected to one side of the baffle (22); and a push rod (11) passing through the dust cover (23), the baffle (22), the support cylinder (19), the limiting ring (18), and the guide sleeve (14). The support cylinder (19) is movably connected to a conical sleeve (21). The other side of the support plate (13) is provided with a driving mechanism to drive the conical sleeve (21) to move back and forth. The outer side of the support cylinder (19) is provided with at least four evenly distributed slots (25). The slots (25) are movably connected to the inside of the slots (25) with matching arc plates (24). One end of the arc plate (24) near the inside of the support cylinder (19) is fixedly connected to an arc-shaped frosted plate (28). The other end of the arc plate (24) is provided with a slope. The four arc plates (24) can form a ring that matches the push rod (11) after they are closed. An anti-detachment component is provided between the arc plate (24) and the slot (25).

2. The material return mechanism for a vehicle end trimming apparatus according to claim 1, wherein The drive mechanism specifically includes: three telescopic motors (16) that are evenly fixed on the other side of the support plate (13), the output shafts of the three telescopic motors (16) are fixedly connected to a moving ring (15), and three evenly distributed transmission rods (17) are fixedly connected to one side of the moving ring (15). The three transmission rods (17) pass through the support plate (13) and are fixedly connected to a support ring (20), and the support ring (20) is fixedly connected to a conical sleeve (21).

3. The material return mechanism for a vehicle end planing apparatus according to claim 2, wherein The anti-detachment component specifically includes: anti-detachment blocks (27) fixed on both sides of the arc plate (24), and an anti-detachment groove (26) is provided on the inner wall of the slot (25) corresponding to the position of the anti-detachment block (27), and the anti-detachment block (27) is movably connected inside the anti-detachment groove (26) and matches it.

4. The material unloading mechanism for a car bottom trimming device according to claim 1, characterized in that, A drive motor (5) is fixedly connected to the other side of the concave plate (2) at the position corresponding to the rotary table (3), and the output shaft of the drive motor (5) passes through the concave plate (2) and is fixedly connected to the rotary table (3).

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