Sand blasting device and method for aluminum alloy workpiece machining

Abstract

The invention discloses a sand blasting device and method for aluminum alloy workpiece machining, and particularly relates to the field of sand blasting, the sand blasting device comprises a machine box, a supporting and positioning assembly is installed in the machine box, the supporting and positioning assembly comprises a support, and a plurality of sets of conveying components are arranged above the support in the circumferential direction; the conveying component is used for conveying the arc-shaped aluminum alloy pipe in the circumferential direction. A sand blasting station is arranged on one side of the support, a sand blasting assembly is arranged at the position of the sand blasting station, the sand blasting assembly is provided with multiple sets of sand blasting guns, the multiple sets of sand blasting guns are arranged in the circumferential direction, and when the conveying component conveys the arc-shaped aluminum alloy pipe, the arc-shaped aluminum alloy pipe penetrates through the middles of the multiple sets of sand blasting guns. The arc-shaped aluminum alloy pipe is conveyed through the multiple sets of conveying components arranged in the circumferential direction, the conveying path of the conveying components is round, and therefore in the conveying process, the sand blasting guns arranged in the circumferential direction of the section circle of the arc-shaped aluminum alloy pipe can conduct sand blasting operation on the surface of the arc-shaped aluminum alloy pipe.

Description

Technical Field

[0001] This invention relates to the field of sandblasting technology, and more specifically, to a sandblasting apparatus and method for processing aluminum alloy workpieces. Background Technology

[0002] Aluminum alloy workpieces require pretreatment, or surface cleaning, before being coated or plated with a protective layer. There are many surface cleaning methods, such as using manual tools or acid pickling. Among these, sandblasting is the most thorough and widely used. Sandblasting uses compressed air to create a high-speed jet, propelling abrasive particles at high speed onto the workpiece surface. Due to the impact and cutting action of the abrasive particles on the workpiece surface, a certain degree of cleanliness and varying roughness are achieved, thereby improving the adhesion, moisture resistance, and corrosion resistance of the coating.

[0003] Aluminum alloy tubes are widely used in transportation (such as automobiles and bicycles), fitness equipment, construction, and other fields. Currently, sandblasting of straight aluminum alloy tubes involves supporting the tube in a roller support device, which drives the tube to rotate, allowing for comprehensive sandblasting of its outer surface. However, for curved aluminum alloy tubes, this roller support device cannot rotate them, necessitating the use of various clamps and multiple sandblasting operations, which is inconvenient. Summary of the Invention

[0004] The present invention provides a sandblasting device and method for processing aluminum alloy workpieces. The problem to be solved is that the roller support device cannot drive the arc-shaped aluminum alloy tube to rotate, which requires the setting of various clamps and sandblasting in several stages, which is inconvenient to operate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sandblasting device for processing aluminum alloy workpieces, comprising a housing, a support and positioning assembly installed inside the housing, the support and positioning assembly including a support, and several sets of conveying components arranged circumferentially above the support, the conveying components being used to convey an arc-shaped aluminum alloy tube along the circumferential direction; a sandblasting station is provided on one side of the support, and a sandblasting assembly is provided at the position of the sandblasting station, the sandblasting assembly having multiple sets of sandblasting guns arranged circumferentially, and when the conveying components convey the arc-shaped aluminum alloy tube, the arc-shaped aluminum alloy tube passes through the middle of the multiple sets of sandblasting guns.

[0006] In a preferred embodiment, the conveying component includes a fixed base, which is fixedly installed on the upper end of the support. A conveying wheel is rotatably connected to both the side of the fixed base near the middle of the support and the side away from the middle of the support. The conveying wheel is conical, and an arc-shaped aluminum alloy tube is conveyed between the two conveying wheels.

[0007] In a preferred embodiment, the support positioning assembly further includes a transmission component, which includes a drive gear rotatably connected to the middle of the upper end of the support. A motor is installed at the bottom of the support, and the output end of the motor is fixedly installed to the middle of the drive gear. Driven gears are fixedly installed at the bottom ends of the two transmission wheels of each set of transmission components. The two driven gears mesh with each other, and the drive gear meshes with the driven gear on the side near the middle of the support.

[0008] In a preferred embodiment, the sandblasting assembly further includes a mounting bracket, which is fixedly installed with the chassis, and a second pin is fixed to one side of the sandblasting gun, which is rotatably connected to one side of the mounting bracket.

[0009] In a preferred embodiment, a movable frame is provided on one side of the fixed frame, and a sliding groove corresponding to each sandblasting gun is provided on the movable frame. A pin three is fixedly connected to one side of the sandblasting gun and slides in the sliding groove. A cylinder one is provided on one side of the fixed frame, and the fixed end and the output end of the cylinder one are hinged to the fixed frame and the movable frame, respectively.

[0010] In a preferred embodiment, an arc-shaped groove is provided on one side of the movable frame, the arc-shaped groove is coaxial with the movable frame, and at least three pins are fixedly installed on one side of the fixed frame, the pins sliding inside the arc-shaped groove.

[0011] In a preferred embodiment, one side of the support has a material unloading station. Above a set of conveying components near the sandblasting station of the material unloading station, a limit assembly is provided. The limit assembly includes a second cylinder. The fixed end of the second cylinder is fixedly installed with the machine housing. A fixed cylinder is fixedly installed at the output end of the second cylinder. A movable rod is movably inserted into the bottom of the fixed cylinder. A spring is provided inside the fixed cylinder to reset the movable rod downwards. A ball is provided at the bottom of the movable rod to press against the outer wall of the arc-shaped aluminum alloy tube.

[0012] In a preferred embodiment, a conveyor belt is provided on one side of the support, and the conveyor belt is located on one side of the unloading station. Baffles are fixedly installed on both sides of the conveyor belt, and the baffle near the limiting component has an opening for clearance.

[0013] In a preferred embodiment, the support has a feeding station on one side, and a second conveyor belt is provided on one side of the feeding station. A flat plate is fixedly installed at one end of the second conveyor belt near the feeding station. A second baffle is fixedly installed at the front end of the flat plate. A discharge port is opened at one end of the flat plate near the second baffle, and the discharge port is located directly above the feeding station.

[0014] The present invention also provides a method for sandblasting an aluminum alloy workpiece using a sandblasting device, comprising the following steps: Step 1: Place the curved aluminum alloy tube on multiple sets of conveyor components; Step 2: The arc-shaped aluminum alloy tube is conveyed along the circumference of the support and positioning assembly by the conveying component; Step 3: When the curved aluminum alloy tube is transported to the sandblasting station, the outer surface of the curved aluminum alloy tube is sandblasted by the sandblasting gun, and the conveying component simultaneously transports the curved aluminum alloy tube forward. Step 4: After the outer surface of the curved aluminum alloy tube is completely sandblasted, the curved aluminum alloy tube is conveyed by the conveying component to the unloading station. The front end of the curved aluminum alloy tube rotates downward under the action of gravity and finally falls down.

[0015] The technical effects and advantages of this invention are as follows: 1. This invention uses several sets of conveying components arranged in a circumferential direction to transport the arc-shaped aluminum alloy tube, making the conveying path of the conveying components circular. Thus, during the conveying process, the sandblasting guns arranged in the circumferential direction of the arc-shaped aluminum alloy tube cross-section can perform sandblasting on the surface of the arc-shaped aluminum alloy tube. Compared with the prior art, there is no need to set up clamps, there is no need to manually change the clamping direction during the sandblasting process, and sandblasting can be carried out while the tube is being transported forward, thus improving the sandblasting efficiency.

[0016] 2. By setting a limiting component, when the arc-shaped aluminum alloy tube is transported to the sandblasting station, the front end of the arc-shaped aluminum alloy tube rotates downward due to gravity and then falls off. This method can shorten the space occupied by the unloading station. Compared with the normal unloading method, the support and positioning component can accommodate a longer arc-shaped aluminum alloy tube, that is, it can sandblast a longer arc-shaped aluminum alloy tube, thereby expanding the application range of this device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of the present invention. Figure 2 ; Figure 4 This is a partial structural diagram of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the structure of the positioning component of the present invention; Figure 6 This is a schematic diagram of the sandblasting assembly of the present invention; Figure 7 This is a schematic diagram of the arc-shaped aluminum alloy tube of the present invention rotating downwards; Figure 8 This is a flowchart of the sandblasting method of the present invention.

[0018] The attached diagram is labeled as follows: 1. Chassis; 2. Support and positioning assembly; 20. Support; 201. Loading station; 202. Sandblasting station; 203. Unloading station; 21. Conveying component; 211. Conveying wheel; 212. Fixed base; 23. Transmission component; 231. Drive gear; 232. Motor; 233. Driven gear; 3. Sandblasting assembly; 31. Fixing frame; 311. Pin 1; 32. Sandblasting Gun; 321, Pin 2; 322, Pin 3; 33, Movable frame; 331, Slide groove; 332, Arc groove; 34, Cylinder 1; 4, Limiting assembly; 41, Cylinder 2; 42, Fixed cylinder; 43, Movable rod; 44, Ball; 5, Conveyor belt 1; 51, Baffle 1; 52, Clearance opening; 6, Conveyor belt 2; 61, Flat plate; 62, Baffle 2; 63, Drop outlet; 7, Arc-shaped aluminum alloy tube. 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] Refer to the instruction manual appendix Figures 1-8 A sandblasting device for processing aluminum alloy workpieces includes a housing 1. A support and positioning assembly 2 is installed inside the housing 1. The support and positioning assembly 2 includes a support 20. Several sets of conveying components 21 are arranged in the circumferential direction above the support 20. The conveying components 21 are used to convey the arc-shaped aluminum alloy tube 7 along the circumferential direction.

[0021] Among them, such as Figure 5 and Figure 7 As shown, the conveying component 21 includes a fixed base 212, which is fixedly installed on the upper end of the support 20. The fixed base 212 is rotatably connected to a conveying wheel 211 on both the side of the fixed base 212 near the middle of the support 20 and the side away from the middle of the support 20. The conveying wheel 211 is conical, and the arc-shaped aluminum alloy tube 7 is conveyed between the two conveying wheels 211.

[0022] It should be noted that the upper end of the conveyor wheel 211 is a pointed tip, so the two conveyor wheels 211 can support the arc-shaped aluminum alloy tube 7, and when the two conveyor wheels 211 rotate, they can also convey the arc-shaped aluminum alloy tube 7 forward, and the conveying path is circular.

[0023] In the above technical solution, the transmission wheel 211 is driven to rotate by the transmission component 23, specifically, as shown in the example below. Figure 5As shown, the support positioning assembly 2 also includes a transmission component 23. The transmission component 23 includes a drive gear 231 rotatably connected to the middle of the upper end of the support 20. A motor 232 is installed at the bottom of the support 20. The output end of the motor 232 is fixedly installed with the middle of the drive gear 231. The bottom ends of the two transmission wheels 211 of each set of transmission components 21 are fixedly installed with driven gears 233. The two driven gears 233 mesh with each other. The drive gear 231 meshes with the driven gear 233 on the side near the middle of the support 20.

[0024] It should be noted that the motor 232 is a geared motor. The motor 232 drives the drive gear 231 to rotate, the drive gear 231 drives one of the driven gears 233 to rotate, and the driven gear 233 drives another driven gear 233 to rotate, thereby achieving the purpose of driving the two conveyor wheels 211 to rotate in opposite directions, so as to facilitate the forward conveying of the arc-shaped aluminum alloy tube 7.

[0025] In this embodiment, the support 20 has a sandblasting station 202 on one side, and a sandblasting assembly 3 is provided at the position of the sandblasting station 202. The sandblasting assembly 3 has multiple sandblasting guns 32, which are arranged in a circumferential direction. When the conveying component 21 conveys the arc-shaped aluminum alloy tube 7, the arc-shaped aluminum alloy tube 7 passes through the middle of the multiple sandblasting guns 32.

[0026] It should be noted that by setting multiple sets of sandblasting guns 32, sandblasting can be performed in the circumferential direction of the cross-sectional circle of the arc-shaped aluminum alloy tube 7. Thus, during sandblasting, the arc-shaped aluminum alloy tube 7 can be processed while moving forward, without needing to stop.

[0027] In this embodiment, the implementation method is as follows: First, the arc-shaped aluminum alloy tube 7 is placed on multiple sets of conveying components 21, supported by two conveying wheels 211. Then, the motor 232 drives the drive gear 231 to rotate, which in turn drives two driven gears 233 mounted on each set of conveying wheels 211 to rotate, thereby causing the two conveying wheels 211 to rotate in opposite directions. The conveying wheels 211, through friction, transport the arc-shaped aluminum alloy tube 7 forward along a circular path. When the arc-shaped aluminum alloy tube 7 is transported to the sandblasting station 202, the sandblasting gun 32 sandblasts the surface of the arc-shaped aluminum alloy tube 7, such as... Figure 6 As shown, three sandblasting guns 32 are provided. These three sandblasting guns 32 can perform sandblasting in the circumferential direction of the cross-sectional circle of the arc-shaped aluminum alloy tube 7. During the sandblasting process, the conveying component 21 can continue to transport the tube forward, that is, the arc-shaped aluminum alloy tube 7 is sandblasted while being transported forward. After one arc-shaped aluminum alloy tube 7 has been sandblasted, it can be removed, thus completing the sandblasting process.

[0028] The above technical solution uses several sets of conveying components 21 arranged in a circumferential direction to transport the arc-shaped aluminum alloy tube 7, making the conveying path of the conveying components 21 circular. Thus, during the transport process, the sandblasting gun 32 arranged in the circumferential direction of the cross-section circle of the arc-shaped aluminum alloy tube 7 can perform sandblasting operation on the surface of the arc-shaped aluminum alloy tube 7. Compared with the prior art, it is not necessary to set up clamps, and there is no need to manually change the clamping direction during the sandblasting process. Moreover, it can sandblast while conveying forward, which improves the sandblasting efficiency.

[0029] Refer to the instruction manual appendix Figures 2-4 , Figure 6 The sandblasting assembly 3 also includes a fixing frame 31, which is fixedly installed with the housing 1. A second pin 321 is fixed on one side of the sandblasting gun 32, and the second pin 321 is rotatably connected to one side of the fixing frame 31.

[0030] Furthermore, a movable frame 33 is provided on one side of the fixed frame 31. The movable frame 33 has a sliding groove 331 that corresponds to the sandblasting gun 32. A pin 322 is fixedly connected to one side of the sandblasting gun 32. The pin 322 slides in the sliding groove 331. A cylinder 34 is provided on one side of the fixed frame 31. The fixed end and the output end of the cylinder 34 are hinged to the fixed frame 31 and the movable frame 33, respectively.

[0031] Furthermore, an arc-shaped groove 332 is provided on one side of the movable frame 33. The arc-shaped groove 332 is coaxial with the movable frame 33. At least three pins 311 are fixedly installed on one side of the fixed frame 31. The pins 311 slide inside the arc-shaped groove 332.

[0032] It should be noted that, as Figure 6 As shown, there are three pins 311, and the centers of the ends of the three pins 311 are not on the same straight line, so that the movable frame 33 can only rotate around its own axis.

[0033] In this embodiment, when sandblasting the outer surface of the arc-shaped aluminum alloy tube 7, the cylinder 34 extends and retracts to drive the movable frame 33 to rotate forward and backward. When the movable frame 33 rotates, the arc-shaped groove 332 can be pushed to slide inside the groove 331 through the slide groove 331, thereby causing the sandblasting gun 32 to swing back and forth around the axis of the pin 321. The continuous swinging of the sandblasting gun 32 can increase the spraying range of the sandblasting gun 32.

[0034] Refer to the instruction manual appendix Figures 1-7The support 20 has a material unloading station 203 on one side. A limit assembly 4 is provided above a set of conveying components 21 near the sandblasting station 202 of the material unloading station 203. The limit assembly 4 includes a second cylinder 41. The fixed end of the second cylinder 41 is fixedly installed with the machine box 1. A fixed cylinder 42 is fixedly installed at the output end of the second cylinder 41. A movable rod 43 is movably inserted into the bottom of the fixed cylinder 42. A spring is provided inside the fixed cylinder 42. The spring is used to reset the movable rod 43 downward. A ball 44 is provided at the bottom of the movable rod 43. The ball 44 is used to press against the outer wall of the arc-shaped aluminum alloy tube 7.

[0035] It should be noted that after the curved aluminum alloy tube 7 is sprayed, it is conveyed by the conveying component 21 towards the sandblasting station 202. When the front end of the curved aluminum alloy tube 7 is conveyed to the position of the set of conveying components 21 closest to the end of the sandblasting station 202, the upper surface of the curved aluminum alloy tube 7 is pressed by the ball 44. Then the curved aluminum alloy tube 7 continues to be conveyed forward. When the curved aluminum alloy tube 7 is only conveyed by the set of conveying components 21 closest to the end of the sandblasting station 202, and when the front end of the curved aluminum alloy tube 7 extends a certain distance, under the action of gravity, the front end of the curved aluminum alloy tube 7 rotates downward. At this time, the state is as follows. Figures 2-4 and Figure 6 As shown, when the conveying component 21 continues to convey the arc-shaped aluminum alloy tube 7, the arc-shaped aluminum alloy tube 7 eventually falls.

[0036] Furthermore, such as Figure 7 As shown, a conveyor belt 5 is provided on one side of the support 20, and the conveyor belt 5 is located on one side of the unloading station 203. Baffles 51 are fixedly installed on both sides of the conveyor belt 5, and the baffles 51 near the limiting component 4 have a clearance opening 52.

[0037] It should be noted that when the front end of the curved aluminum alloy tube 7 rotates downward at the sandblasting station 202, the end of the curved aluminum alloy tube 7 will enter between the two baffles 51 through the clearance opening 52. After the curved aluminum alloy tube 7 has completely fallen between the two baffles 51, it is then conveyed away. The height of the baffles 51 can be set as needed to ensure that the curved aluminum alloy tube 7 does not fall outside. In addition, after the front end of the curved aluminum alloy tube 7 contacts the conveyor belt 5, the conveyor belt 5 can convey it backward a certain distance to facilitate the front end of the curved aluminum alloy tube 7 to fall onto the conveyor belt 5 before it is conveyed forward to send the curved aluminum alloy tube 7 out.

[0038] Furthermore, such as Figure 2 and Figure 3As shown, the support 20 has a feeding station 201 on one side, and a second conveyor belt 6 is provided on one side of the feeding station 201. A flat plate 61 is fixedly installed at one end of the second conveyor belt 6 near the feeding station 201. A second baffle 62 is fixedly installed at the front end of the flat plate 61. A discharge port 63 is opened at one end of the flat plate 61 near the second baffle 62. The discharge port 63 is located directly above the feeding station 201.

[0039] It should be noted that several unprocessed curved aluminum alloy tubes 7 can be placed on conveyor belt 2 6, which will then transport them forward. When the curved aluminum alloy tubes 7 are transported to the discharge port 63, they fall into several conveying components 21 located at the loading station 201 and are then transported forward. The flat plate 61 supports the curved aluminum alloy tubes 7, and the baffle 2 62 blocks the curved aluminum alloy tubes 7.

[0040] In the above technical solution, the sandblasting device is divided into a loading station 201, a sandblasting station 202, and a unloading station 203. The sandblasting process can only proceed continuously when each station can accommodate at least one curved aluminum alloy tube 7 (meaning at least three curved aluminum alloy tubes 7 must be simultaneously positioned on the support and positioning assembly 2). Otherwise, for example, if only two curved aluminum alloy tubes 7 can be accommodated, the curved aluminum alloy tubes 7 must be unloaded before loading can proceed at the loading station 201, requiring a pause at this point. The above-mentioned technical solution, by setting the limiting component 4, allows the front end of the arc-shaped aluminum alloy tube 7 to rotate downwards and fall off due to gravity when it is conveyed to the sandblasting station 202. This method can shorten the space occupied by the unloading station 203. In other words, compared with the normal unloading method (such as using a clamp to clamp the arc-shaped aluminum alloy tube 7), the support and positioning component 2 can accommodate a longer arc-shaped aluminum alloy tube 7, which means that a longer arc-shaped aluminum alloy tube 7 can be sandblasted, thereby expanding the applicability of this device.

[0041] Refer to the instruction manual appendix Figures 1-8 The present invention also provides a method for sandblasting an aluminum alloy workpiece using a sandblasting device, comprising the following steps: Step 1: Place the arc-shaped aluminum alloy tube 7 on the multiple sets of conveying components 21; Step 2: The arc-shaped aluminum alloy tube 7 is conveyed along the circumferential direction of the support and positioning assembly 2 by the conveying component 21; Step 3: When the curved aluminum alloy tube 7 is transported to the position of the sandblasting station 202, the outer surface of the curved aluminum alloy tube 7 is sandblasted by the sandblasting gun 32, and the conveying component 21 simultaneously conveys the curved aluminum alloy tube 7 forward. Step 4: After the outer surface of the curved aluminum alloy tube 7 is completely sandblasted, the curved aluminum alloy tube 7 is conveyed by the conveying component 21 to the unloading station 203. The front end of the curved aluminum alloy tube 7 rotates downward under the action of gravity and finally falls down.

[0042] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sandblasting device for machining aluminum alloy workpieces, characterized in that: Includes a chassis (1), inside which a support and positioning assembly (2) is installed. The support and positioning assembly (2) includes a support (20), and several sets of conveying components (21) are arranged in the circumferential direction above the support (20). The conveying components (21) are used to convey the arc-shaped aluminum alloy tube (7) along the circumferential direction. The support (20) has a sandblasting station (202) on one side. A sandblasting assembly (3) is provided at the position of the sandblasting station (202). The sandblasting assembly (3) has multiple sandblasting guns (32) arranged in a circumferential direction. When the conveying component (21) conveys the arc-shaped aluminum alloy tube (7), the arc-shaped aluminum alloy tube (7) passes through the middle of the multiple sandblasting guns (32).

2. The sandblasting device for processing aluminum alloy workpieces according to claim 1, characterized in that: The conveying component (21) includes a fixed seat (212), which is fixedly installed on the upper end of the support (20). The fixed seat (212) is rotatably connected to a conveying wheel (211) on both the side of the fixed seat (212) near the middle of the support (20) and the side away from the middle of the support (20). The conveying wheel (211) is conical, and an arc-shaped aluminum alloy tube (7) is conveyed between the two conveying wheels (211).

3. The sandblasting device for processing aluminum alloy workpieces according to claim 2, characterized in that: The support positioning assembly (2) also includes a transmission component (23), which includes a drive gear (231) rotatably connected to the middle of the upper end of the support (20). A motor (232) is installed at the bottom of the support (20). The output end of the motor (232) is fixedly installed at the middle of the drive gear (231). The bottom ends of the two transmission wheels (211) of each set of transmission components (21) are fixedly installed with driven gears (233). The two driven gears (233) mesh with each other. The drive gear (231) meshes with the driven gear (233) on the side near the middle of the support (20).

4. The sandblasting device for processing aluminum alloy workpieces according to claim 1, characterized in that: The sandblasting assembly (3) also includes a fixing frame (31), which is fixedly installed with the chassis (1). A pin (321) is fixed on one side of the sandblasting gun (32), and the pin (321) is rotatably connected to one side of the fixing frame (31).

5. The sandblasting device for machining aluminum alloy workpieces according to claim 4, characterized in that: A movable frame (33) is provided on one side of the fixed frame (31). The movable frame (33) has a sliding groove (331) corresponding to the sandblasting gun (32). A pin (322) is fixedly connected to one side of the sandblasting gun (32). The pin (322) slides in the sliding groove (331). A cylinder (34) is provided on one side of the fixed frame (31). The fixed end and the output end of the cylinder (34) are hinged to the fixed frame (31) and the movable frame (33) respectively.

6. The sandblasting device for machining aluminum alloy workpieces according to claim 5, characterized in that: An arc-shaped groove (332) is provided on one side of the movable frame (33), and the arc-shaped groove (332) is coaxial with the movable frame (33). At least three pins (311) are fixedly installed on one side of the fixed frame (31), and the pins (311) slide inside the arc-shaped groove (332).

7. The sandblasting device for machining aluminum alloy workpieces according to claim 6, characterized in that: The support (20) has a material unloading station (203) on one side. A limit assembly (4) is provided above a set of conveying components (21) near the sandblasting station (202) of the material unloading station (203). The limit assembly (4) includes a second cylinder (41). The fixed end of the second cylinder (41) is fixedly installed with the machine box (1). A fixed cylinder (42) is fixedly installed at the output end of the second cylinder (41). A movable rod (43) is movably inserted into the bottom of the fixed cylinder (42). A spring is provided inside the fixed cylinder (42). The spring is used to reset the movable rod (43) downward. A ball (44) is provided at the bottom of the movable rod (43). The ball (44) is used to press on the outer wall of the arc-shaped aluminum alloy tube (7).

8. The sandblasting device for machining aluminum alloy workpieces according to claim 7, characterized in that: A conveyor belt (5) is provided on one side of the support (20), and the conveyor belt (5) is located on one side of the unloading station (203). Baffles (51) are fixedly installed on both sides of the conveyor belt (5), and the baffle (51) near the limiting component (4) has an avoidance opening (52).

9. A sandblasting device for machining aluminum alloy workpieces according to claim 1, characterized in that: The support (20) has a loading station (201) on one side. A second conveyor belt (6) is provided on one side of the loading station (201). A flat plate (61) is fixedly installed on one end of the second conveyor belt (6) near the loading station (201). A second baffle (62) is fixedly installed on the front end of the flat plate (61). A discharge port (63) is opened on one end of the flat plate (61) near the second baffle (62). The discharge port (63) is located directly above the loading station (201).

10. A method for sandblasting an aluminum alloy workpiece using a sandblasting device, characterized in that, Includes the following steps: Step 1: Place the arc-shaped aluminum alloy tube (7) on the multiple sets of conveying components (21); Step 2: The arc-shaped aluminum alloy tube (7) is conveyed along the circumferential direction of the support and positioning assembly (2) by the conveying component (21); Step 3: When the arc-shaped aluminum alloy tube (7) is transported to the position of the sandblasting station (202), the outer surface of the arc-shaped aluminum alloy tube (7) is sandblasted by the sandblasting gun (32), and at the same time the conveying component (21) transports the arc-shaped aluminum alloy tube (7) forward. Step 4: After the outer surface of the arc-shaped aluminum alloy tube (7) is completely sandblasted, the arc-shaped aluminum alloy tube (7) is transported by the conveying component (21) to the unloading station (203). The front end of the arc-shaped aluminum alloy tube (7) rotates downward under the action of gravity and finally falls down.

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