A sand blasting and polishing device for automobile apron processing

Abstract

The application discloses a sand blasting and polishing device for automobile guard plate processing and relates to the technical field of sand blasting and polishing. The sand blasting and polishing device comprises a sand blasting main part, a spray head connecting piece is installed on the sand blasting main part, a guide limiting piece is installed on the spray head connecting piece, the end of the guide limiting piece is elastically attached to the sand blasting main part, an air blasting protection piece is installed on the sand blasting main part, the air blasting protection piece is used for shielding the initial-stage abrasive, a time delay control piece is installed on the sand blasting main part, the spray head connecting piece can be unidirectionally rotated and matched with the guide limiting piece, the anti-deviation polishing effect of the structure can be further improved, the staff does not need to manually rotate the spray head connecting piece for adjustment, automatic control can be realized for the rotation adjustment when the sand blasting machine is started to supply air and sand, the sand blasting gun for automobile guard plate processing is not convenient for automatic control of the rotation adjustment of the spray head to reduce the local polishing loss, and the air blasting protection cannot be automatically controlled.

Description

Technical Field

[0001] This invention relates to the field of sandblasting and polishing technology, specifically to a sandblasting and polishing device for processing automotive protective panels. Background Technology

[0002] In the actual manufacturing process of automotive skid plates, after bending and stamping, the skid plates usually require further polishing to remove surface rust and create a frosted texture through sandblasting, enhancing the product's aesthetics. The principle of a sandblasting machine is that the abrasive is propelled by a high-pressure jet nozzle on one side of the spray gun connected to a hose. Due to its high efficiency, it is widely used in surface processing of sheet materials. However, in actual use, the high-pressure gas from the current sandblasting guns used for automotive skid plate processing tends to concentrate on one side of the nozzle's inner wall, carrying abrasive particles. This causes uneven wear on one side of the nozzle, reducing its lifespan and increasing operating costs. It also makes it difficult to automatically control nozzle rotation to reduce localized wear and to automatically control dry-fire protection. After the sandblasting machine stops, moisture and residual abrasive particles easily accumulate in the pipes, causing agglomeration. Especially for fine sandblasting work, if manual dry-fire removal of residual abrasive particles is forgotten before polishing, localized scratches on the automotive skid plates can easily occur.

[0003] Therefore, this invention proposes a sandblasting and polishing device for processing automotive protective panels. Summary of the Invention

[0004] The purpose of this invention is to provide a sandblasting and polishing device for processing automotive protective panels, so as to solve the problems mentioned in the background art that the current sandblasting guns for processing automotive protective panels are not convenient for automatically controlling the rotation and adjustment of the nozzle to reduce local wear, and are also not convenient for automatically controlling the dry spray protection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sandblasting and polishing device for processing automotive protective panels, comprising a sandblasting main body, a nozzle connector mounted on the sandblasting main body, the nozzle connector being used to reduce localized wear; a guide limiting component mounted on the nozzle connector; the end of the guide limiting component elastically fitting the sandblasting main body; an air-jet protection component mounted on the sandblasting main body; the air-jet protection component being used to shield the initial abrasive; a delay control component mounted on the sandblasting main body; the sandblasting main body includes: a sandblasting pipe, a spiral groove, and a guide groove, the sandblasting pipe being externally connected to the sand supply pressure tank of a sandblasting machine via a flexible hose; a spiral groove is formed on the sandblasting pipe, and the spiral groove is a spiral groove; a guide groove is formed at the bottom of the sandblasting pipe, and each guide groove has a V-shaped structure.

[0006] Preferably, the sandblasting main body further includes: a cover plate mounting shell, an air supply pipe, an adsorption fixing block, and a spring sheet. The cover plate mounting shell is fixedly installed on the sandblasting pipe; the air supply pipe is fixedly installed on the sandblasting pipe and is inclined; the air supply pipe is connected to the compressed air pump of the sandblasting machine through a flexible hose; the adsorption fixing block is fixedly installed on the sandblasting pipe and has an inclined structure; the adsorption fixing block has a groove; a spring sheet is fixedly installed in the groove on the adsorption fixing block; the spring sheet is an elastic steel sheet.

[0007] Preferably, the nozzle connector includes: a nozzle connecting pipe, a nozzle, a one-way bearing, and a rotating collar. The nozzle connecting pipe is slidably sleeved on the bottom of the sandblasting pipe; the nozzle is threadedly fastened to the inner side of the nozzle connecting pipe, and a rubber sleeve is fitted onto the bottom of the nozzle; the nozzle is slidably sleeved inside the sandblasting pipe; the outer ring of the one-way bearing is fixedly sleeved on the inner side of the top of the nozzle connecting pipe; the rotating collar is fixedly installed on the inner ring of the one-way bearing by bolts; the one-way bearing is sleeved on the outer side of the sandblasting pipe; and the top of the nozzle is located below the air supply pipe.

[0008] Preferably, the nozzle connector further includes: a guide post and a reset spring. A ring of guide posts is threaded onto the rotating collar, and the ends of the ring of guide posts pass through the rotating collar. The ends of the ring of guide posts are arc-shaped structures. The ends of the ring of guide posts are located in a spiral groove. The reset spring is sleeved on the outside of the sandblasting pipe. One end of the reset spring is fixedly connected to the rotating collar, and the other end of the reset spring is fixedly connected to the sandblasting pipe.

[0009] Preferably, the guide limiting component includes: a limiting bolt and a limiting post, wherein the limiting bolt is threadedly connected to the nozzle connecting pipe; the limiting post is slidably inserted into the nozzle connecting pipe, and one end of the limiting post has a tapered structure; the end of the limiting post is located in the corresponding guide groove.

[0010] Preferably, the guide limiting component further includes: a limiting spring, wherein a limiting spring is sleeved inside the nozzle connecting pipe; one end of the limiting spring is fixedly connected to the other end of the limiting post; the other end of the limiting spring is fixedly connected to the limiting bolt; the limiting spring is used to elastically push the limiting post.

[0011] Preferably, the air spray protection component includes: a protective swing arm, a limiting block, and a protective groove. The protective swing arm is rotatably mounted on the sandblasting pipe. The limiting block is fixedly mounted on the protective swing arm, and the limiting block is used to limit the rotation angle of the protective swing arm. A protective groove is provided at the bottom of the protective swing arm. The protective groove is an arc-shaped groove.

[0012] Preferably, the air spray protection component further includes: an electromagnet, which is fixedly installed on the protective swing arm; the electromagnet is aligned with the adsorption fixing block; when the electromagnet magnetically adsorbs the fixing block, the protective groove is located directly below the nozzle; and the end of the spring sheet elastically fits against the electromagnet.

[0013] Preferably, the delay control component includes: a control cover and an air source switch, wherein the control cover is slidably mounted on the cover plate mounting shell; a rubber pad is provided on the outer side of the control cover; the air source switch is fixedly mounted on the sandblasting pipe; and the air source switch is electrically connected to the power supply of the sandblasting machine.

[0014] Preferably, the delay control component further includes: a delay switch, which is fixedly installed on the sandblasting pipe; the delay switch is electrically connected to an electromagnet; the pressing ends of the delay switch and the air source switch are fixedly installed on the control cover; the delay switch and the air source switch are located inside the cover plate mounting housing; the cover plate mounting housing is provided with a wire hole for the wire harness of the delay switch and the air source switch to pass through.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a rotatable and adjustable nozzle, which extends the nozzle's service life. Although the nozzle has strong wear resistance, its lifespan is still limited by wear. This structure avoids wear from abrasive particles mixed with high-pressure gas ejected from the air supply pipe on a single location inside the nozzle, reducing sandblasting costs and increasing the utilization rate of the nozzle's inner wall. The use of a unidirectional rotatable nozzle connector, along with a guide and limiting component, further enhances the anti-abrasion effect. Operators do not need to manually rotate the nozzle connector for adjustment; automatic control is achieved when the sandblasting machine starts supplying air and sand. Simultaneously, the nozzle connector automatically rotates unidirectionally, automatically switching the nozzle's inner wall area facing the high-pressure air outlet of the air supply pipe. Automatic adjustment is achieved using the pressure of the sandblasting machine's air and sand supply, resulting in a compact structure.

[0016] By employing a time-delay control component in conjunction with an air-jet protection component, the system can automatically block the abrasive ejected from the front of the blasting pipe during sandblasting operations, improving sandblasting quality and ensuring standardized sandblasting operations. This prevents workers from forgetting the air-jet operation or directly spraying abrasive onto the car's skid plate during the air-jet operation, as the abrasive condensation in the pipes can cause it to clump and be directly sprayed onto the skid plate, resulting in excessive sandblasting pressure and scratches. Furthermore, the air-jet timing control is more accurate, reducing the learning curve for operators. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the sandblasting and polishing device for processing automotive protective panels according to the present invention. Figure 2This is a schematic diagram of the bottom structure of the sandblasting and polishing device for processing automotive protective panels according to the present invention; Figure 3 This is a cross-sectional view of the internal structure of the sandblasting and polishing device for processing automotive protective panels according to the present invention. Figure 4 This is a schematic diagram of the sandblasting main component structure of the present invention; Figure 5 This is a cross-sectional view of the internal structure of the nozzle connector of the present invention; Figure 6 This is a schematic diagram of the installation position of the one-way bearing of the present invention; Figure 7 This is a schematic diagram of the limiting post structure of the present invention; Figure 8 For the present invention Figure 5 Enlarged view of the structure of region B in the middle; Figure 9 This is a schematic diagram of the air jet protection component of the present invention; Figure 10 This is a schematic diagram of the delay control component of the present invention.

[0018] In the diagram: 1. Sandblasting main body; 101. Sandblasting pipe; 1011. Spiral groove; 1012. Guide groove; 1013. Cover plate mounting shell; 102. Air supply pipe; 103. Adsorption fixing block; 104. Spring; 2. Nozzle connector; 201. Nozzle connecting pipe; 2011. Nozzle; 202. One-way bearing; 203. Rotating collar; 2031. Guide post; 204. Reset tension spring; 3. Guide limiting component; 301. Limit bolt; 302. Limit post; 303. Limit spring; 4. Dry spray protection component; 401. Protective swing arm; 4011. Limit block; 4012. Protective groove; 402. Electromagnet; 5. Delay control component; 501. Control cover; 502. Air source switch; 503. Delay switch. Detailed Implementation

[0019] 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.

[0020] Example 1: Please refer to Figures 1 to 10 As shown: This invention provides a technical solution: a sandblasting and polishing device for processing automotive protective panels, comprising a sandblasting main body 1, a nozzle connector 2 mounted on the sandblasting main body 1, the nozzle connector 2 being used to reduce local wear; a guide limiting component 3 mounted on the nozzle connector 2; the end of the guide limiting component 3 elastically fitting the sandblasting main body 1; an air spray protection component 4 mounted on the sandblasting main body 1; the air spray protection component 4 being used to shield the initial abrasive; a delay control component 5 mounted on the sandblasting main body 1; the sandblasting main body 1 includes: a sandblasting pipe 101, a spiral groove 1011, and a guide groove 1012, the sandblasting pipe 101 being connected externally to the sand supply pressure tank of the sandblasting machine via a flexible hose; a spiral groove 1011 is formed on the sandblasting pipe 101, and the spiral groove 1011 is a spiral groove; a guide groove 1012 is formed at the bottom of the sandblasting pipe 101, and the guide groove 1012 is a V-shaped structure.

[0021] The main sandblasting component 1 further includes: a cover plate mounting shell 1013, an air supply pipe 102, an adsorption fixing block 103, and a spring sheet 104. The cover plate mounting shell 1013 is fixedly installed on the sandblasting pipe 101; the air supply pipe 102 is fixedly installed on the sandblasting pipe 101 and is inclined; the air supply pipe 102 is connected to the compressed air pump of the sandblasting machine via a flexible hose; the adsorption fixing block 103 is fixedly installed on the sandblasting pipe 101, and the adsorption fixing block 103 has an inclined structure; the adsorption fixing block 104... The fixed block 103 has a groove; a spring piece 104 is fixedly installed in the groove on the adsorption fixing block 103; the spring piece 104 is an elastic steel sheet; the nozzle connector 2 includes: a nozzle connecting pipe 201, a nozzle 2011, a one-way bearing 202 and a rotating collar 203, the nozzle connecting pipe 201 is slidably sleeved on the bottom of the sandblasting pipe 101; the nozzle 2011 is threadedly fastened to the inner side of the nozzle connecting pipe 201, and a rubber sleeve is sleeved on the bottom of the nozzle 2011; the nozzle 2011 is slidably sleeved on the bottom of the sandblasting pipe 101. Inside the sandblasting pipe 101, the outer ring of the one-way bearing 202 is fixedly sleeved on the inner side of the top of the nozzle connecting pipe 201; the rotating ring 203 is fixedly installed on the inner ring of the one-way bearing 202 by bolts; the one-way bearing 202 is sleeved on the outside of the sandblasting pipe 101; the top of the nozzle 2011 is located below the air supply pipe 102; the nozzle 2011 installed on the one-way bearing 202 can be rotated and adjusted, which can improve the service life of the nozzle 2011. Although the nozzle 2011 has strong wear resistance, there is still a wear life limitation. This structure can avoid the abrasive wear of the nozzle 2011 by the high-pressure gas sprayed from the air supply pipe 102 at a single position on the inner side of the nozzle 2011, which can reduce the sandblasting and grinding cost, improve the utilization rate of the inner wall of the nozzle 2011, and reduce the turbulence interference on the inner wall of the nozzle 2011 caused by severe local wear; at the same time, the replacement of the nozzle 2011 is the same as the replacement of existing nozzles, and the disassembly and replacement work can be carried out by manually rotating the nozzle 2011.

[0022] The nozzle connector 2 further includes: a guide post 2031 and a reset spring 204. A ring of guide posts 2031 is threaded onto the rotating collar 203, and the ends of the ring of guide posts 2031 pass through the rotating collar 203. The ends of the ring of guide posts 2031 are arc-shaped structures. The ends of the ring of guide posts 2031 are located in a ring of spiral grooves 1011. The reset spring 204 is sleeved on the outside of the sandblasting pipe 101. One end of the reset spring 204 is fixedly connected to the rotating collar 203, and the other end of the reset spring 204 is fixedly connected to the sandblasting pipe 101. The guide limiting component 3 includes: a limiting bolt 301 and a limiting post 302. The limiting bolt 301 is threaded onto the nozzle connecting pipe 201. A sliding insertion is made on the nozzle connecting pipe 201. The limiting post 302 has a tapered end; the end of the limiting post 302 is located in the guide groove 1012; the guide limiting component 3 also includes a limiting spring 303, which is sleeved inside the nozzle connecting pipe 201; one end of the limiting spring 303 is fixedly connected to the other end of the limiting post 302; the other end of the limiting spring 303 is fixedly connected to the limiting bolt 301; the limiting spring 303 is used to elastically push the limiting post 302; by using the nozzle connecting component 2, which can rotate in one direction, in conjunction with the guide limiting component 3, the anti-wear effect of this structure can be further improved. Operators do not need to manually rotate the nozzle connecting component 2 for adjustment; automatic control can be achieved when the sandblasting machine starts supplying air and sand, and the nozzle connecting component 3 can also rotate and adjust. Component 2 automatically rotates in one direction, automatically switching the nozzle 2011's inner wall area to face the high-pressure air outlet of the air supply pipe 102. This automatic adjustment is achieved using the pressure of the air and sand supplied by the sandblasting machine. Its compact structure makes it more suitable for large-area sandblasting of automotive protective panels in high-wear environments, extending the service life of the nozzle 2011. Under the combined action of the air pressure from the sandblasting machine's sand supply pressure tank air pump and compressed air pump, the nozzle 2011 moves the nozzle connecting pipe 201 downwards. As the nozzle connecting pipe 201 moves downwards, it moves the guide post 2031 on the rotating collar 203. Simultaneously, guided by the spiral groove 1011, the guide post 2031 causes the rotating collar 203 to rotate and move downwards simultaneously. At this point, the reset pull... Spring 204 is stretched and twisted. At the same time, when rotating collar 203 rotates and moves downward, one-way bearing 202 is in a one-way locked state. At this time, nozzle connecting pipe 201 and nozzle 2011 will also be driven to rotate. Since the air pressure acting on nozzle 2011 is relatively large at this time, when nozzle connecting pipe 201 rotates, limit post 302 will also be driven to move. The tail of limit post 302 is elastically pushed by limit spring 303. The end of limit post 302 adopts a conical structure, which can be squeezed back by the currently inserted V-shaped guide groove 1012. As nozzle connecting pipe 201 rotates and moves downward, under the elastic compression of limit spring 303, it is inserted into the next guide groove 1012 without causing jamming of the rotation and downward movement of nozzle connecting pipe 201.

[0023] In Example 2, based on Example 1, the air-jet protection component 4 includes: a protective swing arm 401, a limiting block 4011, and a protective groove 4012. The protective swing arm 401 is rotatably mounted on the sandblasting pipe 101; the limiting block 4011 is fixedly mounted on the protective swing arm 401, and the limiting block 4011 is used to limit the rotation angle of the protective swing arm 401; a protective groove 4012 is provided at the bottom of the protective swing arm 401; the protective groove 4012 is an arc-shaped groove; when the nozzle 2011 moves down and extends, there is still a gap between the bottom of the nozzle 2011 and the protective groove 4012; the air-jet protection component 4 also includes: an electromagnet 402, the protective swing arm 4011, and the protective swing arm 4012. An electromagnet 402 is fixedly installed on the nozzle 2011; the electromagnet 402 is aligned with the adsorption fixing block 103; when the electromagnet 402 magnetically adsorbs the fixing block 103, the protective groove 4012 is located directly below the nozzle 2011; the end of the spring piece 104 elastically fits the electromagnet 402; the delay control component 5 includes: a control cover 501 and an air source switch 502, the control cover 501 is slidably installed on the cover plate mounting shell 1013; a rubber pad is provided on the outside of the control cover 501; the air source switch 502 is fixedly installed on the sandblasting pipe 101; the air source switch 502 is electrically connected to the power supply of the sandblasting machine; the delay control component 5 also includes: a delay switch 503, the delay switch 503 is fixedly installed on the sandblasting pipe 101; the time delay switch 503 is electrically connected to the electromagnet 402; the pressing ends of the time delay switch 503 and the air source switch 502 are fixedly installed on the control cover 501; the time delay switch 503 and the air source switch 502 are located inside the cover plate mounting housing 1013; the cover plate mounting housing 1013 is provided with a wire hole for the wire harness of the time delay switch 503 and the air source switch 502 to pass through; by using the time delay control component 5 in conjunction with the air spray protection component 4, it is possible to automatically control the abrasive sprayed from the front section of the sandblasting pipe 101 to block the abrasive sprayed by the operator during sandblasting operations, thereby improving the sandblasting quality and ensuring the standardization of sandblasting operations, and avoiding If workers forget to perform the dry-blasting operation, or mistakenly point the blasting pipe 101 directly at the car skid plate during the initial dry-blasting of abrasive, the abrasive residue trapped in the pipe due to condensation will be directly sprayed onto the skid plate, causing excessive blasting pressure and scratching the skid plate. Furthermore, uneven distribution of abrasive residue in the initial pipe makes it difficult to control the blasting pressure. This structure features automatic shielding protection, better conforming to relevant blasting operation standards and reducing worker error rates. After several tens of seconds of dry-blasting discharge, the shielding automatically disengages, allowing workers to resume normal blasting operations. The dry-blasting time control is also more accurate.

[0024] The working principle of this embodiment is as follows: During actual sandblasting, the control cover 501 is manually pressed. At this time, the air source switch 502 and the delay switch 503 are pressed simultaneously, controlling the start of the sandblasting machine. Simultaneously, the electromagnet 402 is energized and de-energized after a delay. The energization delay time is determined according to the pipeline length and can be set to twenty seconds. During this time, the electromagnet 402 is electromagnetically attracted to the fixing block 103, causing the protective swing arm 401 to rotate and compress the spring 104. At this point, the abrasive material ejected from the nozzle 2011 is blocked by the protective groove 4012, thus... The groove-shaped structure of the protective groove 4012 can disperse the abrasive outward, making it impossible to perform sandblasting operations normally. At the same time, the impact force of the abrasive splashed after being blocked by the protective groove 4012 is greatly reduced, avoiding damage to the car's skid plate. As the electromagnet 402 is energized for a delay, it will automatically de-energize and no longer magnetically attract the fixed block 103. At this time, under the pressure of the spring 104, the protective swing arm 401 will rotate and expand outward, causing the protective groove 4012 to no longer block the nozzle 2011. At this time, the abrasive that may have agglomerated or other factors in the front section has been discharged. After the sandblasting machine is powered on, the air pump in the sand supply pressure tank starts, using air pressure to push the abrasive into the sandblasting pipe 101. Simultaneously, the compressed air pump also starts, supplying high pressure from the air supply pipe 102. The sandblasting pipe 101 experiences an instantaneous pressure surge. When the abrasive passes the connection between the sandblasting pipe 101 and the air supply pipe 102, it is further accelerated by the high-pressure airflow from the air supply pipe 102 and ejected from the nozzle 2011. Since the nozzle's inner orifice is relatively small, under the combined action of the air pressure from the sand supply pressure tank air pump and the compressed air pump, the nozzle 2011 moves the nozzle connecting pipe 201 downwards. As the nozzle connecting pipe 201 moves downwards, it moves the guide post 2031 on the rotating collar 203. Simultaneously, the guide post 2031, guided by the spiral groove 1011, causes the rotating collar 203... While rotating and moving downwards, the reset spring 204 is stretched and twisted. At the same time, as the rotating collar 203 rotates and moves downwards, the one-way bearing 202 is locked. At this time, the nozzle connecting pipe 201 and the nozzle 2011 will also be driven to rotate. Since the air pressure acting on the nozzle 2011 is relatively large at this time, the limiting post 302 will also be driven to move when the nozzle connecting pipe 201 rotates. The tail of the limiting post 302 is elastically pushed by the limiting spring 303. The end of the limiting post 302 adopts a conical structure, which can be squeezed back by the currently inserted V-shaped guide groove 1012. As the nozzle connecting pipe 201 rotates and moves downwards, under the elastic compression of the limiting spring 303, it is inserted into the next adjacent guide groove 1012, without causing jamming of the rotation and downward movement of the nozzle connecting pipe 201. Then, the staff can proceed with the sandblasting operation normally. Using the air pressure supplied by the sandblasting machine, the car skid plate is polished. After polishing one skid plate, the staff presses the control cover 501 again to stop the sandblasting machine and switch to the next skid plate. At this time, the air pressure in the sandblasting pipe 101 disappears, and the nozzle 2011 no longer has enough air pressure to push downwards. The reset spring 204 pulls the rotating collar 203 upwards. At the same time, the guide post 2031 on the rotating collar 203 is also pulled upwards and rotates back to its original position under the guidance of the spiral groove 1011. However... At this time, the one-way bearing 202 is in an idle state and will not lock. At this time, the rotational force generated by the one-way bearing 202 rotating is negligible. In addition, the limit post 302 is elastically inserted into the guide groove 1012, which can guide the nozzle connecting pipe 201 to move vertically upward and reset. When the next car guard plate is polished, the nozzle 2011 will rotate again and maintain unidirectional rotation. This ensures that the nozzle 2011 will rotate and adjust once every time the car guard plate is sandblasted, so that the inner wall of the nozzle 2011 is worn evenly and the utilization rate is fully improved.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sandblasting and polishing device for processing automotive protective panels, comprising a sandblasting main body, wherein a nozzle connector is mounted on the sandblasting main body, characterized in that: The nozzle connector is equipped with a guide limiting component; the end of the guide limiting component elastically fits the sandblasting body component; An air-blasting protection component is installed on the main sandblasting component; a delay control component is installed on the main sandblasting component; The main sandblasting component includes: a sandblasting pipe, a spiral groove, and a guide groove. The sandblasting pipe is connected to the sand supply pressure tank of the sandblasting machine. A spiral groove is formed on the sandblasting pipe. A guide groove is formed at the bottom of the sandblasting pipe, and the guide groove has a V-shaped structure. The main sandblasting component further includes: a cover plate mounting shell, an air supply pipe, an adsorption fixing block, and a spring sheet. The cover plate mounting shell is fixedly installed on the sandblasting pipe; the air supply pipe is fixedly installed on the sandblasting pipe and is inclined; the air supply pipe is connected to the compressed air pump of the sandblasting machine; the adsorption fixing block is fixedly installed on the sandblasting pipe; the adsorption fixing block has a groove; and a spring sheet is fixedly installed in the groove on the adsorption fixing block. The nozzle connector includes: a nozzle connecting pipe, a nozzle, a one-way bearing, and a rotating collar. The nozzle connecting pipe is slidably sleeved on the bottom of the sandblasting pipe; the nozzle is threadedly fastened to the inner side of the nozzle connecting pipe; the nozzle is slidably sleeved inside the sandblasting pipe; the outer ring of the one-way bearing is fixedly sleeved on the inner side of the top of the nozzle connecting pipe; the rotating collar is fixedly installed on the inner ring of the one-way bearing; the one-way bearing is sleeved on the outer side of the sandblasting pipe; the top of the nozzle is located below the air supply pipe. The air spray protection component includes: a protective swing arm, a limiting block, and a protective groove. The protective swing arm is rotatably mounted on the sandblasting pipe. The limiting block is fixedly mounted on the protective swing arm. A protective groove is provided at the bottom of the protective swing arm. The protective groove is an arc-shaped groove.

2. The sandblasting and polishing device for processing automotive protective panels according to claim 1, characterized in that: The nozzle connector further includes: a guide post and a reset spring. A ring of guide posts is connected to the rotating collar, and the ends of the guide posts pass through the rotating collar. The ends of the guide posts are all arc-shaped. The ends of the guide posts are located in a spiral groove. The reset spring is sleeved on the outside of the sandblasting pipe. One end of the reset spring is fixedly connected to the rotating collar, and the other end of the reset spring is fixedly connected to the sandblasting pipe.

3. The sandblasting and polishing device for processing automotive protective panels according to claim 1, characterized in that: The guide limiting component includes a limiting bolt and a limiting post. The limiting bolt is threadedly connected to the nozzle connecting pipe. The limiting post is slidably inserted into the nozzle connecting pipe, and one end of the limiting post has a tapered structure. The end of the limiting post is located in the corresponding guide groove.

4. The sandblasting and polishing device for processing automotive protective panels according to claim 3, characterized in that: The guide limiting component further includes: a limiting spring, which is sleeved inside the nozzle connecting pipe; one end of the limiting spring is fixedly connected to the other end of the limiting post; the other end of the limiting spring is fixedly connected to the limiting bolt.

5. The sandblasting and polishing device for processing automotive protective panels according to claim 1, characterized in that: The air spray protection component also includes: an electromagnet, which is fixedly installed on the protective swing arm; the electromagnet is aligned with the adsorption fixing block; when the electromagnet magnetically adsorbs the fixing block, the protective groove is located directly below the nozzle; and the end of the spring sheet elastically fits the electromagnet.

6. The sandblasting and polishing device for processing automotive protective panels according to claim 5, characterized in that: The delay control component includes: a control cover and an air source switch. The control cover is slidably mounted on the cover plate mounting shell; the air source switch is fixedly mounted on the sandblasting pipe; and the air source switch is electrically connected to the power supply of the sandblasting machine.

7. The sandblasting and polishing device for processing automotive protective panels according to claim 6, characterized in that: The delay control component further includes: a delay switch, which is fixedly installed on the sandblasting pipe; the delay switch is electrically connected to an electromagnet; and the pressing ends of the delay switch and the air source switch are fixedly installed on the control cover.

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