Polishing device for automobile parts

Abstract

The invention discloses a polishing device for automobile spare parts, and relates to the technical field of automobile spare parts, the polishing device comprises a bottom plate, and telescopic plates are arranged at the two ends of the bottom plate; the inner wall grinding mechanisms are arranged at the two ends of the to-be-ground part and extend into the to-be-ground part, and the to-be-ground part is kept to be stably placed; the telescopic assembly is arranged on the side, facing the telescopic plate, of the inner wall grinding mechanism, and the two ends of the telescopic assembly are connected with the inner wall grinding mechanism and the telescopic plate correspondingly; the outer wall grinding assembly is movably arranged on the bottom plate and abuts against the outer wall of the to-be-ground part; the unscrewing assembly controlled by the driving assembly is arranged to support the inner wall of a to-be-polished part, a rotating disc is rotated to drive a sliding column in a penetrating groove to drive a moving rod to do synchronous telescopic motion, the moving rod is conveniently controlled to abut against the inner walls of to-be-polished parts of different sizes, and the adaptability of the device is improved; and the to-be-polished part can be stably placed, the stability of the to-be-polished part is improved, and the polishing quality is improved.

Description

Technical Field

[0001] This application relates to the technical field of automotive parts, and particularly to a grinding device for automotive parts. Background Art

[0002] A grinding device for automotive parts is a device specifically used for surface treatment and finishing of automotive components; its main function is to remove burrs, oxide layers, rust, etc. on the surface of parts to improve the surface finish and dimensional accuracy of the parts; the grinding part includes but is not limited to, body repair: in automotive sheet metal repair, used to grind uneven parts on the body surface; precision part processing: used for surface finishing of precision parts to ensure the dimensional accuracy and surface finish of the parts; metal pipe fitting grinding: used for grinding the inner wall of automotive metal pipe fittings to remove burrs and oxide layers.

[0003] Regarding the grinding of metal pipe fittings, the traditional grinding method for welded tubular fittings usually requires using different devices to grind the inner and outer walls of the pipe fittings successively because there will also be welding points inside the pipe wall during welding.

[0004] In view of the above related technologies, the inventor believes that using different devices to separately grind one wall of the inner and outer walls of automotive metal pipe fittings successively increases the operation steps and time, and reduces the overall processing efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a grinding device for automotive parts to improve the problem that using different devices to separately grind one wall of the inner and outer walls of automotive metal pipe fittings successively increases the operation steps and time, and reduces the overall processing efficiency.

[0006] A grinding device for automotive parts provided by this application adopts the following technical solutions: The grinding device for automotive parts includes: a bottom plate, with telescopic plates provided at both ends of the bottom plate; an inner wall grinding mechanism, which is provided at both ends of the part to be ground and extends into the part to be ground to keep the part to be ground stably placed; a telescopic component, which is provided on the side of the inner wall grinding mechanism facing the telescopic plate, and both ends of the telescopic component are respectively connected to the inner wall grinding mechanism and the telescopic plate; an outer wall grinding component, which is movably arranged on the bottom plate and abuts against the outer wall of the part to be ground; a clamping frame, with two clamping frames slidably arranged on both sides of the bottom plate, and the two clamping frames are respectively arranged at both ends of the part to be ground to block and limit the part to be ground.

[0007] By adopting the above technical solution, the inner wall grinding mechanism arranged on the telescopic plate plays a supporting role for the part to be ground, and at the same time, the inner wall grinding mechanism is used to rotate and grind the part to be ground, improving the internal grinding efficiency; by arranging a telescopic component connected to the inner wall grinding mechanism, the inner wall grinding mechanism is controlled to penetrate into the part to be ground to completely grind its interior, ensuring no omission; by arranging a clamping frame to block the part to be processed, ensuring that it does not slide along the length direction of the bottom plate during the processing; by controlling the placement height of the part to be ground through the telescopic plate, it is convenient to cooperate with the outer wall grinding component to abut against it for external grinding, and by rotating the part to be ground through the inner wall grinding mechanism, the outer wall surface thereof can be evenly contacted with the outer wall grinding component; the inner and outer walls of the part to be ground are ground simultaneously, reducing the operation steps and time, and improving the work efficiency.

[0008] Optionally, the inner wall grinding mechanism includes a driving component and a spreading component. The driving component includes a receiving body with an internal cavity, a transmission shaft penetrating through one side of the receiving body and having a gear arranged at one end in the cavity of the receiving body, a rack meshing with the gear at one end of the transmission shaft, and a cylinder for driving the rack to move; the transmission shaft is rotatably connected to the receiving body, and the cylinder is fixedly arranged in the receiving body.

[0009] By adopting the above technical solution, by arranging the driving component to drive the spreading component, the automation of the device is improved; by arranging the receiving body to install components, and by arranging the cylinder to drive the rack to drive the rotating shaft to rotate, it is convenient to control the spreading component to spread and support the part to be ground, which is convenient for operation and improves the efficiency.

[0010] Optionally, the spreading component includes a rotating disk connected to the end of the transmission shaft away from the receiving body. A plurality of through grooves are arranged on the rotating disk. A plurality of fixed seats are arranged on the surface of the receiving body close to the rotating disk. A moving rod is slidably connected in the fixed seat. One end of the moving rod is provided with a sliding column sliding in the through groove. When the rotating disk rotates, the through groove drives the sliding column to drive the moving rod to perform synchronous telescopic movement.

[0011] By adopting the above technical solution, by arranging the spreading component controlled by the driving component to support the inner wall of the part to be ground, by rotating the rotating disk, the sliding column in the through groove is driven to drive the moving rod to perform synchronous telescopic movement, which is convenient to control the moving rod to abut against the inner walls of parts to be ground with different sizes, increasing the adaptability of the device; at the same time, it can stably place the part to be ground, improving the stability of the part to be ground during grinding and the grinding quality.

[0012] Optionally, a connection hole is opened at the center of the rotating disk. The transmission shaft abuts against the rotating disk, and a connecting rod threadedly connected to the connection hole is arranged at one end of the transmission shaft.

[0013] By adopting the above technical solution, by setting the connecting holes and the connecting rods, it is convenient to disassemble and install the rotating disc, and it is convenient to repair and replace the rotating disc to improve the service life of the device; at the same time, by replacing different rotating discs, the telescopic amount of the screwing mechanism can be adjusted to adapt to parts to be polished of different sizes, which can make the support and fixation of the screwing assembly more stable, facilitate polishing, and improve the processing quality.

[0014] Optionally, a clamping seat is arranged at one end of the moving rod away from the sliding column. A rolling wheel or a grinding wheel can be installed in the clamping seat, and at least one grinding wheel is provided; a first driving motor connected to the rolling wheel or the grinding wheel is arranged at one end of the clamping seat.

[0015] By adopting the above technical solution, the screwing assembly is used to control the rolling wheel to abut against the inner wall of the part to be polished to fix the part to be polished. The first driving motor is set to control the rolling wheel to rotate, so as to drive the part to be polished to rotate. By setting the grinding wheel to abut against the inner wall of the part to be polished, the inner wall is polished. By rotating the part to be polished and setting the first motor to drive the grinding wheel, the polishing efficiency of the inner wall of the part to be polished is improved; at the same time, rotating the part to be polished in cooperation with the outer wall polishing assembly helps to improve the polishing efficiency of the outer wall polishing assembly.

[0016] Optionally, the first driving motor driving the grinding wheel rotates in the opposite direction to the first driving motor driving the rolling wheel.

[0017] By adopting the above technical solution, the rotation direction of the rolling wheel is the same as that of the part to be polished. By setting a grinding wheel that rolls in the opposite direction, in the same time, compared with the same-direction rotation, the inner wall area polished by the grinding wheel rotating in the opposite direction is larger, which improves the polishing efficiency of the grinding wheel and the overall working efficiency.

[0018] Optionally, a rubber layer is fixedly sleeved on the rolling wheel, and anti-slip grooves for increasing friction are arranged on the outer side of the rubber layer.

[0019] By adopting the above technical solution, the rubber layer and the anti-slip grooves on the rubber layer help to improve the friction between the rolling wheel and the inner wall of the part to be polished, so that the rolling wheel can better drive the rotation of the part to be polished, thereby improving the working efficiency of the inner wall polishing mechanism and the outer wall polishing assembly.

[0020] Optionally, a translation assembly is arranged on the bottom plate and between the two telescopic plates. The translation assembly includes a second driving motor arranged on one side of the telescopic plate, a threaded rod fixedly connected to the output end of the second driving motor, and a moving plate threadedly connected to the threaded rod. The outer wall polishing assembly is arranged on the moving plate.

[0021] By adopting the above technical solution, by setting the second driving motor to rotate the threaded rod to drive the moving plate to move, the automation degree of the device is improved; by setting the translation component to move the outer wall grinding component, the outer wall grinding component can move along the threaded rod, which is convenient for the outer wall grinding component to grind the outer wall of the part to be ground along its length direction. Cooperating with the rotation of the component to be ground itself, the outer wall is completely ground, which helps to improve the grinding efficiency and quality.

[0022] Optionally, a sliding groove is formed in the bottom plate, and a sliding block that is snap-fitted and slidable in the sliding groove is provided on the moving plate corresponding to the sliding groove.

[0023] By adopting the above technical solution, by setting the sliding groove and the sliding block, it helps to ensure the stable movement of the moving plate, helps to improve the stability of the outer wall grinding component, and thus improves the grinding quality of the outer wall of the part to be ground.

[0024] Optionally, the outer wall grinding component includes a third driving motor and a grinding layer provided at the output end of the third driving motor.

[0025] By adopting the above technical solution, by setting the third driving motor to rotate the grinding layer to grind the outer wall of the part to be ground, the way of rotating grinding helps to improve the grinding efficiency and quality of the outer wall grinding component.

[0026] In summary, the present application includes at least the following beneficial technical effects of the grinding device for automotive parts: 1. The inner wall grinding mechanism provided on the telescopic plate plays a supporting role for the part to be ground, and at the same time uses the inner wall grinding mechanism to rotate and grind the part to be ground, improving the internal grinding efficiency; by setting the telescopic component connected to the inner wall grinding mechanism, controlling the inner wall grinding mechanism to penetrate into the part to be ground and completely grinding its interior to ensure no omission; by setting the clamping frame to block the part to be processed to ensure that it does not slide along the length direction of the bottom plate during the processing; by controlling the placement height of the part to be ground by the telescopic plate, it is convenient to cooperate with the outer wall grinding component to abut against it for external grinding, and by rotating the part to be ground by the inner wall grinding mechanism, the outer wall surface thereof can be evenly contacted with the outer wall grinding component; the inner and outer walls of the part to be ground are ground simultaneously, reducing the operation steps and time and improving the work efficiency; 2. By setting the unscrewing component controlled by the driving component to support the inner wall of the part to be ground, by rotating the rotating disc, driving the sliding column in the through groove to drive the moving rod to perform synchronous telescopic movement, it is convenient to control the moving rod to abut against the inner walls of parts to be ground with different sizes, increasing the adaptability of the device; at the same time, it can stably place the part to be ground, improving the stability of the part to be ground during grinding and improving the grinding quality; 3. The rotating and opening component is used to control the rolling wheel to abut against the inner wall of the part to be polished, thereby fixing the part to be polished. The first driving motor is set to control the rotation of the rolling wheel, so as to drive the part to be polished to rotate. The grinding wheel is set to abut against the inner wall of the part to be polished to polish its inner wall. By rotating the part to be polished and setting the first motor to drive the grinding wheel, the polishing efficiency of the inner wall of the part to be polished is improved. At the same time, rotating the part to be polished in cooperation with the outer wall polishing component helps to improve the polishing efficiency of the outer wall polishing component. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure of the grinding device for automotive parts.

[0028] Figure 2 It is a schematic diagram for showing the structure of the inner wall grinding mechanism in the embodiment.

[0029] Figure 3 It is a schematic diagram for showing the structure of the rotating disk in the embodiment.

[0030] Figure 4 It is a schematic diagram for showing the structure of the rolling wheel in the embodiment.

[0031] In the figure, 1 is the bottom plate; 2 is the telescopic plate; 3 is the inner wall grinding mechanism; 4 is the telescopic component; 5 is the outer wall grinding component; 51 is the third driving motor; 52 is the grinding layer; 6 is the driving component; 61 is the storage body; 62 is the transmission shaft; 621 is the connecting rod; 63 is the rack; 64 is the cylinder; 7 is the rotating and opening component; 71 is the rotating disk; 711 is the through groove; 712 is the connecting hole; 72 is the fixed seat; 73 is the moving rod; 731 is the sliding column; 8 is the clamping seat; 81 is the first driving motor; 82 is the rolling wheel; 821 is the rubber layer; 8211 is the anti-slip groove; 83 is the grinding wheel; 9 is the translation component; 91 is the second driving motor; 92 is the threaded rod; 93 is the moving plate; 10 is the sliding groove; 11 is the sliding block; 12 is the part to be polished; 13 is the clamping frame. Detailed Embodiment

[0032] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 4 drawings to make a further detailed description of the present application.

[0033] The grinding device for automotive parts, refer to Figure 1, including a bottom plate 1, with telescopic plates 2 provided at both ends of the bottom plate 1. The telescopic plates 2 are divided into cylinder parts and rod parts. The rod parts are inserted into the cylinder parts and are driven to telescopically move by hydraulic pressure; on the bottom plate 1 and between the two telescopic plates 2, a translation assembly 9 is provided. The translation assembly 9 includes a second driving motor 91 provided on one side of the telescopic plate 2, a threaded rod 92 fixedly connected to the output end of the second driving motor 91, and a moving plate 93 threadedly connected to the threaded rod 92. The output end of the second driving motor 91 rotates to drive the moving plate 93 to move on the threaded rod 92. A sliding groove 10 is formed on the bottom plate 1, and a sliding block 11 that is snap-fitted and slidable in the sliding groove 10 is provided on the moving plate 93 corresponding to the sliding groove 10. The sliding block 11 assists in supporting the moving plate 93 to maintain balance; The outer wall grinding assembly 5 includes a third driving motor 51 and a grinding layer 52 provided at the output end of the third driving motor 51. The third driving motor 51 is bolted to the moving plate 93, and the grinding layer 52 is a conventional grinding material for automotive parts; Grooves are formed on both sides of the bottom plate 1, and two clamping brackets 13 are slidably arranged in the grooves. The two clamping brackets 13 are respectively arranged at both ends of the part to be ground 12 to block and limit the part to be ground 12, ensuring that the part to be processed 12 does not move along the length direction of the bottom plate 1 during the grinding process; The telescopic assembly 4 is arranged on the side of the inner wall grinding mechanism 3 facing the telescopic plate 2. Both ends of the telescopic assembly 4 are respectively connected to the inner wall grinding mechanism 3 and the telescopic plate 2. The telescopic assembly 4 is divided into a cylinder part and a rod part. The rod part is inserted into the cylinder part and is driven to telescopically move by hydraulic pressure.

[0034] Refer to Figure 2 , the inner wall grinding mechanism 3 is arranged at one end of the rod part of the telescopic assembly 4, and is located at both ends of the part to be ground 12 and extends into the part to be ground 12 to keep the part to be ground 12 stably placed; Refer to Figure 1 , Figure 2 , Figure 3 , the inner wall grinding mechanism 3 includes a driving assembly 6 and a screwing-off assembly 7. The driving assembly 6 includes a receiving body 61 with an internal cavity. The receiving body 61 is fixedly connected to the rod part of the telescopic assembly 4. A transmission shaft 62 that penetrates the receiving body 61 and is rotatably connected to the receiving body 61 through a bearing is arranged inside the receiving body 61. A gear is arranged at one end of the transmission shaft 62 located in the cavity of the receiving body 61. A cylinder 64 is arranged in the cavity of the receiving body 61. A rack 63 is arranged at the output end of the cylinder 64. The cylinder 64 drives the rack 63 to mesh with the gear at one end of the transmission shaft 62, and the transmission shaft 62 is driven to rotate through the driving linkage of the cylinder 64; One end of the transmission shaft 62 away from the gear is provided with a connecting rod 621. The connecting rod 621 is provided with threads. The diameter of the connecting rod 621 is smaller than that of the transmission shaft 62. The transmission shaft 62 abuts against the center of the rotating disk 71 in the unscrewing assembly 7. A connecting hole 712 is provided at the center of the rotating disk 71. The connecting rod 621 is threadedly connected to the connecting hole 712 to fix the synchronous movement of the rotating disk 71 and the transmission shaft 62. The unscrewing assembly 7 includes a rotating disk 71 connected to one end of the transmission shaft 62 away from the storage body 61. The rotating disk 71 is provided with a plurality of through grooves 711, specifically three, which helps to stably fix the component to be polished. The number of through grooves 711 can be increased according to the situation. A plurality of fixing seats 72 are provided on the surface of the storage body 61 close to the rotating disk 71. The number of fixing seats 72 corresponds to the number of through grooves 711. The fixing seat 72 is provided with a groove, and a moving rod 73 is slidably connected in the groove. The moving rod 73 is in a snap-fit sliding connection, specifically, it can only slide in the groove of the fixing seat 72. One end of the moving rod 73 is provided with a sliding column 731 that slides in the through groove 711. The sliding column 731 is adapted to the through groove 711, that is, the sliding column 731 slides stably in the through groove 711 without shaking. When the rotating disk 71 rotates, the through groove 711 drives the sliding column 731 to drive the moving rod 73 to perform synchronous telescopic movement, specifically corresponding to the diameter of the component to be polished 12. By rotating the rotating disk, the sliding column 731 is caused to slide in the through groove 711, so that the moving rod 73 presses against the inner wall of the component to be polished 12. One end of the moving rod 73 away from the sliding column 731 is provided with a clamping seat 8. A rolling wheel 82 or a grinding wheel 83 can be installed in the clamping seat 8. One end of the clamping seat 8 is provided with a first driving motor 81 connected to the rolling wheel 82 or the grinding wheel 83. The output end of the first driving motor 81 is connected to the axis of the rolling wheel 82 or the grinding wheel 83. The rolling wheel 82 or the grinding wheel 83 is driven to rotate by the first driving motor 81. At least one grinding wheel 83 is provided for grinding the inner wall of the component to be polished 12. The material of the grinding wheel 83 is the same as that of the polishing layer 52, which is a conventional material for polishing automotive parts. The first driving motor 81 driving the grinding wheel 83 rotates in the opposite direction to the first driving motor 81 driving the rolling wheel 82. For example, if the rotation direction of the first driving motor 81 driving the rolling wheel 82 is clockwise, then the rotation direction of the first driving motor 81 driving the grinding wheel 83 is counterclockwise.

[0035] Refer to Figure 4 , a rubber layer 821 is fixedly sleeved on the rolling wheel 82. The rubber layer 821 is a layer of rubber and is pasted and laid on the rolling surface of the rolling wheel 82 through an adhesive material. The surface of the rubber layer 821 in contact with the component to be polished 12 is provided with anti-slip grooves 8211 for increasing friction.

[0036] The implementation principle of the embodiment of this application is: During actual operation, both ends of the part 12 to be polished are placed on the inner wall polishing mechanism 3. The telescopic component 4 is controlled to make the inner wall polishing mechanism 3 penetrate into the part 12 to be polished, support both ends of the part 12 to be polished, and the moving clamping frame 13 blocks both ends of the part 12 to be polished to keep the part 12 to be polished stably placed. The rack 63 is driven by the air cylinder 64 to drive the transmission shaft 62 to rotate, so that the sliding column 731 in the through groove 711 of the rotating disk 71 fixedly connected to the transmission shaft 62 moves synchronously under the drive of the rotation of the through groove 711. The movement of the sliding column 731 drives the moving rod 73 to expand and contract. The movement of the moving rod 73 makes the rolling wheel 82 and the grinding wheel 83 in the clamping seat 8 abut against the inner wall of the part 12 to be polished. The first driving motor 81 drives the rolling wheel 82 and the grinding wheel 83 to rotate. The rotating wheel increases the friction force through the adhesive layer 821 to drive the part 12 to be polished to rotate synchronously. The grinding wheel 83 rotates in the opposite direction to the rotation direction of the part 12 to be polished, which helps to improve the grinding efficiency of the grinding wheel 83 and the overall processing efficiency. At this time, by controlling the movement of the telescopic plate 2, the outer wall of the part 12 to be polished is made to abut against the outer wall polishing assembly 5. The third driving motor 51 drives the polishing layer 52 to rotate to cooperate with the self-rotation of the part 12 to be polished to polish its outer wall, improving the polishing efficiency of the outer wall. At the same time, the third driving motor 51 drives the threaded rod 92 to rotate, so that the moving plate 93 drives the outer wall polishing assembly 5 installed thereon to polish along the length direction of the part 12 to be polished, so that the outer wall of the part 12 to be polished can be completely covered and polished. The device polishes the inner and outer walls of the part 12 to be polished integrally and synchronously, reducing the operation steps and time, and improving the overall processing efficiency.

[0037] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same parts are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A grinding device for automobile parts, characterized in that: include A bottom plate (1), with telescopic plates (2) being arranged at both ends of the bottom plate (1); An inner wall grinding mechanism (3), wherein the inner wall grinding mechanism (3) is arranged at both ends of the part to be ground (12) and extends into the interior of the part to be ground (12) to keep the part to be ground (12) stably placed; A telescopic component (4), the telescopic component (4) being arranged on a side of the inner wall grinding mechanism (3) facing the telescopic plate (2), and the two ends of the telescopic component (4) being respectively connected to the inner wall grinding mechanism (3) and the telescopic plate (2); An outer wall grinding component (5), the outer wall grinding component (5) is movably arranged on the base plate (1) along the length direction of the base plate (1) and abuts against the outer wall of the part (12) to be ground; A clamping frame (13), two clamping frames (12) are slidably arranged on both sides of the base plate (1), and the two clamping frames (12) are respectively arranged at two ends of the part to be polished (12), and can block and limit the part to be polished (12).

2. The polishing device for automobile parts according to claim 1, characterized in that: The inner wall grinding mechanism (3) comprises a driving assembly (6) and a screwing assembly (7), wherein the driving assembly (6) comprises a storage body (61) with a built-in cavity, a transmission shaft (62) which is arranged through one side of the storage body (61) and has a gear at one end in the cavity of the storage body (61), a rack (63) which cooperates with the gear at one end of the transmission shaft (62), and a cylinder (64) which drives the rack (63) to move; the transmission shaft (62) is rotatably connected to the storage body (61), and the cylinder (64) is fixedly arranged in the storage body (61).

3. The polishing device for automobile parts according to claim 2, characterized in that: The unscrewing assembly (7) comprises a rotating disk (71) connected to one end of the transmission shaft (62) away from the storage body (61); a plurality of through grooves (711) are arranged on the rotating disk (71); a plurality of fixed seats (72) are arranged on one side of the storage body (61) close to the rotating disk (71); a moving rod (73) is slidably connected in the fixed seat (72); a sliding column (731) sliding in the through groove (711) is arranged at one end of the moving rod (73); when the rotating disk (71) rotates, the through groove (711) drives the sliding column (731) to drive the moving rod (73) to perform synchronous telescopic movement.

4. The polishing device for automobile parts according to claim 3, characterized in that: A connecting hole (712) is provided at the center of the rotating disk (71), the transmission shaft (62) abuts against the rotating disk (71), and a connecting rod (621) threadedly connected to the connecting hole (712) is provided at one end of the transmission shaft (62).

5. The polishing device for automobile parts according to claim 3, characterized in that: A clamping seat (8) is provided at one end of the moving rod (73) away from the sliding column (731), and a rolling wheel (82) or a grinding wheel (83) can be installed in the clamping seat (8), and at least one grinding wheel (83) is provided; a first driving motor (81) connected to the rolling wheel (82) or the grinding wheel (83) is provided at one end of the clamping seat (8).

6. The polishing device for automobile parts according to claim 5, characterized in that: The first driving motor (81) driving the grinding wheel (83) and the first driving motor (81) driving the rolling wheel (82) rotate in opposite directions.

7. The polishing device for automobile parts according to claim 5, characterized in that: The upper fixed sleeve of the rolling wheel (82) is provided with a rubber layer (821), and the outer side of the rubber layer (821) is provided with an anti-skid groove (8211) for increasing friction.

8. The polishing device for automobile parts according to claim 1, characterized in that: A translation assembly (9) is arranged on the bottom plate (1) and between the two telescopic plates (2); the translation assembly (9) comprises a second drive motor (91) arranged on one side of the telescopic plate (2), a threaded rod (92) fixedly connected to the output end of the second drive motor (91), and a moving plate (93) threadedly connected to the threaded rod (92); and the outer wall grinding assembly (5) is arranged on the moving plate (93).

9. The polishing device for automobile parts according to claim 1, characterized in that: The bottom plate (1) is provided with a sliding groove (10), and the movable plate (93) is provided with a sliding block (11) corresponding to the sliding groove (10) and engaged and sliding therein.

10. The polishing device for automobile parts according to claim 1, characterized in that: The outer wall grinding assembly (5) comprises a third driving motor (51) and a grinding layer (52) arranged at the output end of the third driving motor (51).

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