VTG structure volute inner cavity automatic shot blasting device

Abstract

This utility model discloses an automatic shot blasting device for the inner cavity of a VTG structure volute, belonging to the field of water pump manufacturing technology. It includes a housing, inside which a vertical nozzle assembly and a horizontal nozzle assembly are vertically arranged. The ends of both the vertical and horizontal nozzle assemblies furthest from the shot blasting end are connected to flexible hoses, which extend outside the housing and connect to a shot blasting power device. The vertical nozzle assembly extends into the volute cavity of the volute, while the horizontal nozzle assembly extends from the drain pipe of the volute. Both the vertical and horizontal nozzle assemblies perform shot blasting simultaneously. In use, the volute is placed and fixed inside the housing. The vertical nozzle assembly extends into the volute cavity, and the horizontal nozzle assembly extends from the drain pipe. Both assemblies perform shot blasting simultaneously, with the vertical nozzle assembly rotating while blasting, performing shot blasting sandblasting on the inner wall of the volute. The horizontal nozzle assembly performs shot blasting on the area from the drain pipe to the volute cavity. Compared to manual shot blasting, this method achieves higher shot blasting quality and efficiency for the volute.

Description

Technical Field

[0001] This utility model relates to a shot blasting device, and more particularly to an automatic shot blasting device for the inner cavity of a VTG structure volute. Background Technology

[0002] A shot blasting machine is a casting equipment that uses high-speed shot projectiles to clean or strengthen the surface of castings. Shot blasting machines can simultaneously remove sand, cores, and clean castings. They can also remove burrs, diaphragms, and rust that may affect the integrity of parts of an object. Shot blasting machines can also remove surface contaminants from partially coated surfaces and provide a surface profile that increases coating adhesion, thereby strengthening the workpiece.

[0003] However, shot blasting of VTG volute casings is complex and requires manual processing. Specifically, it addresses the shot blasting of the area from the drain pipe to the volute cavity and the inner wall of the volute cavity. The method involves using a housing containing a manual shot blasting gun and two hand holes fitted with gloves. The volute casing is placed inside the housing, and the inside of the casing and drain pipe is shot blasted while wearing gloves. However, the quality of manually shot blasting VTG volute casing castings is uncontrollable due to factors such as operator technique and blasting time, leading to inconsistent shot blasting quality. Utility Model Content

[0004] The purpose of this invention is to provide an automatic shot blasting device for the inner cavity of a VTG structure volute, which can automatically perform shot blasting on the inner wall of the volute cavity and the part from the drain pipe to the volute cavity, effectively solving the problem of unstable processing quality caused by manual shot blasting in the prior art.

[0005] This utility model adopts the following technical solution: an automatic shot blasting device for the inner cavity of a VTG structure volute, comprising a housing, in which a vertical nozzle assembly and a horizontal nozzle assembly are vertically arranged; a flexible hose is connected to the end of each of the vertical and horizontal nozzle assemblies away from the shot blasting end, and the flexible hose extends out of the housing and connects to a shot blasting power device; the vertical nozzle assembly extends into the volute cavity of the volute, and the horizontal nozzle assembly extends into the drain pipe of the volute; the vertical and horizontal nozzle assemblies blast shot simultaneously, and the vertical nozzle assembly rotates while blasting shot; the shot blasting power device is used to feed iron shot into the vertical and horizontal nozzle assemblies by compressed air.

[0006] Furthermore, a fixed plate is fixedly installed inside the housing, and a vertical nozzle assembly is installed on the fixed plate. The vertical nozzle assembly includes a vertical spray pipe and a horizontal nozzle fixedly installed at the bottom end of the vertical spray pipe. The top end of the vertical spray pipe is rotatably connected to the fixed plate. A driving device is installed on the horizontal nozzle, and a transmission device is installed on the vertical spray pipe. A reset device is installed on the transmission device. The reset device is used to drive the transmission device to move when the horizontal nozzle is not shot blasting, and the transmission device drives the driving device to reset.

[0007] Furthermore, the driving device includes hinge rods hinged to both sides of the horizontal nozzle. The two hinge rods extend to the front side of the horizontal nozzle and a baffle is fixedly installed between them. When shot blasting is not performed, the reset device drives the driving device to reset through the transmission device. At this time, the baffle is in an inclined state to block the mouth of the horizontal nozzle. A driving block is fixedly installed at the end of the hinge rod near the vertical nozzle.

[0008] Furthermore, the transmission device includes a drive sleeve, which is threadedly connected to the vertical spray pipe. A guide rod is fixedly installed on the upper end face of the drive sleeve, and the guide rod is inserted into the fixed plate. The drive sleeve slides up and down relative to the fixed plate through the guide rod.

[0009] Furthermore, the outer surface of the vertical nozzle is provided with a threaded groove, and a limiting post is fixedly provided on the inner side wall of the drive sleeve. The inner end of the limiting post is adapted to the threaded groove and located in the threaded groove. The drive sleeve is threadedly connected to the vertical nozzle through the cooperation of the limiting post and the threaded groove.

[0010] Furthermore, the reset device includes a reset spring sleeved on a guide rod located between the fixed plate and the drive sleeve.

[0011] Furthermore, the fixed plate has a through hole, and the top end of the vertical spray pipe is rotatably connected to the fixed plate through a bearing fixedly embedded in the through hole. A connecting pipe is fixedly embedded in the top end of the through hole of the fixed plate, and the hose is fixedly connected to the connecting pipe.

[0012] Furthermore, the horizontal nozzle assembly includes a base fixedly mounted to the bottom wall of the housing, a hydraulic telescopic rod fixedly mounted on the side of the base, a movable rod fixedly mounted through the output end of the hydraulic telescopic rod passing through the base, a movable nozzle fixedly mounted on the movable rod, and a flexible hose connected to the end of the movable nozzle away from the volute. The shot blasting power device can input high-speed iron shot and compressed air into the movable nozzle and spray them out through the flexible hose.

[0013] Furthermore, a collection cover with a large opening at the top and a small opening at the bottom is fixedly installed on the lower end face of the box, and the inner bottom wall of the box is a mesh grid.

[0014] Furthermore, a manual shot blasting gun is installed inside the chamber, and the manual shot blasting gun is connected to the shot blasting power device through a hose; two hand holes are opened on the front side of the chamber, and work gloves are fixedly installed in the hand holes.

[0015] I. This utility model, by setting up a vertical nozzle assembly, a horizontal nozzle assembly, and a housing, allows for shot blasting of the volute housing. The volute housing is placed and fixed inside the housing, the vertical nozzle assembly extends into the volute cavity, and the horizontal nozzle assembly extends from the drain pipe of the volute housing. Both the vertical and horizontal nozzle assemblies perform shot blasting simultaneously, with the vertical nozzle assembly rotating while blasting. This process sandblasts the inner wall of the volute housing, while the horizontal nozzle assembly performs shot blasting on the area from the drain pipe to the volute cavity. Compared to manual shot blasting, this method achieves higher quality and efficiency for the volute housing.

[0016] II. This utility model, by setting up a vertical spray pipe, a horizontal nozzle, a drive sleeve, a return spring, a baffle, a hinge rod, and a drive block, allows the shot to be blasted during shot blasting. The shot blasted inside the horizontal nozzle strikes the baffle, causing the baffle to rotate. The hinge rod then moves the drive block upwards, pushing the drive sleeve upwards. The upward movement of the drive sleeve pushes the vertical spray pipe to rotate, which in turn causes the vertical spray pipe to rotate the horizontal nozzle. This allows the horizontal nozzle to rotate during shot blasting. When the drive sleeve moves upwards, it compresses the return spring. When shot blasting is not in progress, the baffle is no longer impacted by the shot blasted inside the horizontal nozzle. The return spring pushes the drive sleeve downwards (simultaneously causing the vertical spray pipe to rotate in the opposite direction). The drive sleeve pushes the drive block downwards, and the drive block rotates the hinge rod, causing the hinge rod to rotate the baffle upwards. This allows the baffle to return to its original position in front of the horizontal nozzle, blocking the nozzle's opening. Shot blasting then resumes, and the horizontal nozzle rotates again. This process repeats, blasting the volute cavity repeatedly, achieving the purpose of rotating shot blasting within the volute cavity using the horizontal nozzle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the air intake of this utility model; Figure 3 This is a three-dimensional structural diagram of the collection cover in this utility model; Figure 4 This is a schematic diagram of the internal three-dimensional structure of the box in this utility model; Figure 5 This is a schematic diagram of the internal three-dimensional structure of the fixing plate in this utility model; Figure 6 In this utility model Figure 5 Enlarged schematic diagram of the structure at point A in the diagram; Figure 7 This is a three-dimensional structural diagram of the fixing plate in this utility model; Figure 8 This is a three-dimensional structural diagram of the base in this utility model; Figure 9 This is a three-dimensional structural diagram of the drive sleeve in this utility model; Figure 10 This is a three-dimensional structural diagram of the baffle in this utility model; Figure 11 This is a three-dimensional structural diagram of the horizontal nozzle in this utility model.

[0018] In the diagram, 1. Housing; 2. Vertical nozzle assembly; 3. Horizontal nozzle assembly; 4. Hose; 5. Volute; 6. Drain pipe; 7. Fixing plate; 8. Vertical spray pipe; 9. Horizontal nozzle; 10. Hinge rod; 11. Baffle; 12. Drive block; 13. Drive sleeve; 14. Guide rod; 15. Threaded groove; 16. Limiting post; 17. Return spring; 18. Connecting pipe; 19. Bearing; 20. Base; 21. Hydraulic telescopic rod; 22. Moving rod; 23. Moving nozzle; 24. Mesh grid; 25. Collection cover; 26. Support leg; 27. Mounting platform; 28. Fan; 29. ​​Air intake; 30. Manual shot blasting gun; 31. Hand hole. Detailed Implementation

[0019] Please see Figure 1-11 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The automatic shot blasting device for the inner cavity of a VTG-structured volute housing according to this utility model includes a housing 1. A vertical nozzle assembly 2 and a horizontal nozzle assembly 3 are vertically arranged inside the housing 1. A flexible hose 4 is connected to the end of each nozzle assembly 2 and the horizontal nozzle assembly 3 furthest from the shot blasting end. The flexible hose 4 extends outside the housing 1 and connects to a shot blasting power unit. A volute housing 5 is placed and fixed inside the housing 1. The vertical nozzle assembly 2 extends into the volute cavity of the volute housing 5, and the horizontal nozzle assembly 3 extends from the drain pipe 6 of the volute housing 5. The vertical nozzle assembly 2 and the horizontal nozzle assembly 3 simultaneously blast the volute housing, and the vertical nozzle assembly 2 rotates while blasting, performing shot blasting sandblasting on the inner wall of the volute housing 5. Compared to manual shot blasting, the shot blasting quality and efficiency of the volute housing 5 are higher. The shot blasting power unit uses compressed air to deliver iron shot into the vertical nozzle assembly 2 and the horizontal nozzle assembly 3 and eject it at high speed; this is existing technology and will not be described in detail here.

[0020] In this embodiment, a fixing plate 7 is fixedly installed inside the housing 1, and a vertical nozzle assembly 2 is installed on the fixing plate 7. The vertical nozzle assembly 2 includes a vertical spray pipe 8 and a horizontal nozzle 9 fixedly installed at the bottom end of the vertical spray pipe 8. The top end of the vertical spray pipe 8 is rotatably connected to the fixing plate 7. A driving device is installed on the horizontal nozzle 9, and a transmission device is installed on the vertical spray pipe 8. When the horizontal nozzle 9 is blasting shot outward in the volute cavity, the driving device is activated. The driving device drives the vertical spray pipe 8 to rotate through the transmission device, thereby causing the vertical spray pipe 8 to drive the horizontal nozzle 9 to rotate, so that the horizontal nozzle 9 can blast shot 360 degrees in the volute cavity, achieving the purpose of the vertical nozzle assembly 2 blasting shot while rotating. A reset device is also installed on the transmission device. The reset device is used to drive the transmission device to move when the horizontal nozzle 9 is not blasting shot, and the transmission device drives the driving device to reset.

[0021] In this embodiment, the driving device includes hinge rods 10 hinged to both sides of the horizontal nozzle 9. The two hinge rods 10 extend to the front of the horizontal nozzle 9 and a baffle 11 is fixedly provided between them. When not blasting, the reset device drives the driving device to reset through the transmission device. At this time, the baffle 11 is in an inclined state to block the mouth of the horizontal nozzle 9. A driving block 12 is fixedly provided at one end of the hinge rod 10 near the vertical nozzle 8. When blasting is performed, the shot blasted in the horizontal nozzle 9 hits the baffle 11, causing the baffle 11 to drive the hinge rod 10 to rotate. The hinge rod 10 pushes the transmission device through the driving block 12. The transmission device drives the vertical nozzle 8 to rotate, thereby causing the vertical nozzle 8 to drive the horizontal nozzle 9 to rotate, so that the horizontal nozzle 9 can achieve 360-degree rotation during shot blasting.

[0022] The hinge rod 10 and the drive block 12 together act as a lever.

[0023] In this embodiment, the transmission device includes a drive sleeve 13, which is threadedly connected to the vertical spray pipe 8. A guide rod 14 is fixedly provided on the upper end face of the drive sleeve 13. The guide rod 14 is inserted into the fixed plate 7. The drive sleeve 13 slides up and down relative to the fixed plate 7 through the guide rod 14. When shot blasting is performed, the shot blasted in the horizontal nozzle 9 hits the baffle 11, causing the baffle 11 to drive the hinge rod 10 to rotate. The hinge rod 10 drives the drive block 12 to rotate upward, causing the drive block 12 to push the drive sleeve 13 to move upward. Since the drive sleeve 13 can only move up and down and cannot rotate under the restriction of the guide rod 14, the upward movement of the drive sleeve 13 drives the vertical spray pipe 8 to rotate, thereby achieving the purpose of driving the vertical spray pipe 8 to rotate.

[0024] In this embodiment, a threaded groove 15 is provided on the outer surface of the vertical nozzle 8, and a limiting post 16 is fixedly provided on the inner side wall of the drive sleeve 13. The inner end of the limiting post 16 is adapted to the threaded groove 15 and is located in the threaded groove 15. The drive sleeve 13 is threadedly connected to the vertical nozzle 8 through the cooperation of the limiting post 16 and the threaded groove 15. When the drive sleeve 13 moves up and down, the drive sleeve 13 drives the vertical nozzle 8 to rotate through the cooperation of the limiting post 16 and the threaded groove 15, thereby achieving the purpose of driving the vertical nozzle 8 to rotate by moving the drive sleeve 13 up and down.

[0025] In this embodiment, the reset device includes a reset spring 17 sleeved on a guide rod 14 located between the fixed plate 7 and the drive sleeve 13. During shot blasting, the shot blasted in the horizontal nozzle 9 strikes the baffle 11, causing the baffle 11 to rotate the hinge rod 10. The hinge rod 10 then moves the drive block 12 upwards, causing the drive block 12 to push the drive sleeve 13 upwards. The upward movement of the drive sleeve 13, through the cooperation of the limiting post 16 and the threaded groove 15, pushes the vertical nozzle 8 to rotate, thereby causing the vertical nozzle 8 to rotate the horizontal nozzle 9. This allows the horizontal nozzle 9 to achieve 360-degree rotation during shot blasting. When the drive sleeve 13 moves upwards, it compresses the reset spring 17. When shot blasting is not performed, the baffle 11 is no longer impacted by the shot blasted in the horizontal nozzle 9, and the reset spring 17 pushes the drive sleeve 13 downwards (simultaneously causing the vertical nozzle 8 to rotate in the opposite direction). The drive sleeve 13 then pushes the drive block 12... Moving downwards, the drive block 12 drives the hinge rod 10 to rotate, causing the hinge rod 10 to drive the baffle 11 to rotate upwards, so that the baffle 11 is back in front of the horizontal nozzle 9, blocking the mouth of the horizontal nozzle 9, and then shot blasting is performed again. The horizontal nozzle 9 rotates again to blast the shot, and this process is repeated to blast the volute cavity. Therefore, the iron shot supplied to the horizontal nozzle 9 is intermittent. Through the design of the threaded groove 15 pitch, the maximum angle of rotation of the baffle 11 caused by the shot blasting can drive the vertical nozzle 8 to rotate one, two, or three times. Each shot blasting operation causes the horizontal nozzle 9 to rotate several times to blast the volute 5, and then stop for a set time, and then blast again to rotate several times, and so on, until the shot blasting time is stopped. The intermittent supply of shot to the horizontal nozzle 9 can be achieved by setting a solenoid valve on the delivery pipeline to open and close it regularly.

[0026] In this embodiment, a through hole is provided on the fixing plate 7, and the top end of the vertical nozzle 8 is rotatably connected to the fixing plate 7 through a bearing 19 fixedly embedded in the through hole. A connecting pipe 18 is fixedly embedded at the top end of the through hole of the fixing plate 7, and the hose 4 is fixedly connected to the connecting pipe 18; thus achieving the purpose of the hose 4 inputting high-speed iron shot into the vertical nozzle 8, but without affecting the rotation of the vertical nozzle 8.

[0027] In this embodiment, the horizontal nozzle assembly 3 includes a base 20 fixedly disposed to the bottom wall of the housing 1. A hydraulic telescopic rod 21 is fixedly disposed on the side of the base 20. A movable rod 22 is fixedly disposed through the output end of the hydraulic telescopic rod 21 and passes through the base 20. A movable nozzle 23 is fixedly disposed on the movable rod 22. The end of the movable nozzle 23 away from the volute 5 is connected to the hose 4. The shot blasting power device can input high-speed iron shot and compressed air into the movable nozzle 23 and spray them out through the hose 4. In use, the hydraulic telescopic rod 21 extends and pushes the movable rod 22 to move, so that the movable rod 22 drives the movable nozzle 23 to move, so that the movable nozzle 23 is inserted into the drain pipe 6. After the hose 4 is connected to the movable nozzle 23, it can adapt to the movement of the movable nozzle 23.

[0028] In this embodiment, the fixing plate 7 is fixedly installed on the base 20 via the side plate, thereby achieving the purpose of fixing the fixing plate 7 to the housing 1.

[0029] In this embodiment, a collection hood 25 with a large opening at the top and a small opening at the bottom is fixedly installed on the lower end face of the box body 1. The inner bottom wall of the box body 1 is a mesh grid 24. When in use, the iron shot generated by the shot blasting of the vertical nozzle assembly 2 and the horizontal nozzle assembly 3 both leak down from the mesh grid 24 into the collection hood 25 and then flow out from the bottom of the collection hood 25, thereby achieving the purpose of iron shot recycling.

[0030] In this embodiment, a plurality of support legs 26 are fixedly provided on the lower end face of the housing 1, and an installation platform 27 is fixedly provided between the plurality of support legs 26. A fan 28 is fixedly provided on the upper end face of the installation platform 27. The exhaust end of the fan 28 is provided with an air intake 29 fixedly provided with the corresponding support leg 26 through a pipe. The exhaust end of the fan 28 is fixedly provided at the top of the housing 1 through a pipe and communicates with the inside of the housing 1 to realize ventilation inside the housing 1.

[0031] In this embodiment, a manual shot blasting gun 30 is installed inside the housing 1. The manual shot blasting gun 30 is connected to the shot blasting power device through a hose 4. Two hand holes 31 are opened on the front side of the housing 1. Work gloves (not shown in the figure) are fixedly installed on the hand holes 31. Manual shot blasting is added on the basis of automatic shot blasting. Manual shot blasting assists automatic shot blasting. After the automatic shot blasting is completed, if there are any parts that have not been treated properly by visual inspection, they are treated by manual shot blasting. Specifically, both hands are wearing work gloves and are inserted into the housing 1. Then, the left hand holds the volute 5 and the right hand holds the manual shot blasting gun 30 to perform shot blasting treatment on the parts that have not been treated properly.

[0032] The working principle of this utility model is as follows: First, the volute 5 is placed and fixed on the mesh grille 24 of the housing 1, so that the horizontal nozzle 9 is located in the volute cavity of the volute 5. Then, the hydraulic telescopic rod 21 is activated, which pushes the moving rod 22 to move. The moving rod 22 drives the moving nozzle 23 into the drain pipe 6 of the volute 5. Then, the fan 28 is activated for ventilation and the shot blasting power device is activated. The shot blasting power device sends high-pressure air and iron shot into the moving nozzle 23 through the hose 4 and sprays it out from the moving nozzle 23, so that the moving nozzle 23 performs shot blasting treatment on the drain pipe 6 and the volute cavity of the volute 5. At the same time, the shot blasting power... The device delivers high-pressure air and iron shot into the vertical nozzle 8 through the hose 4. The iron shot in the vertical nozzle 8 is ejected through the horizontal nozzle 9. The iron shot ejected from the horizontal nozzle 9 hits the baffle 11, causing the baffle 11 to drive the hinge rod 10 to rotate downwards. The hinge rod 10 drives the drive block 12 to rotate upwards. The drive block 12 pushes the drive sleeve 13 to move upwards. The drive sleeve 13 drives the vertical nozzle 8 to rotate, and the vertical nozzle 8 drives the horizontal nozzle 9 to rotate at least one revolution. This allows the horizontal nozzle 9 to rotate while blasting shot, achieving the purpose of automatic shot blasting. The horizontal nozzle 9 rotates and blasts shot repeatedly until the set time is reached and the work stops.

Claims

1. An automatic shot blasting device for the inner cavity of a VTG structure volute, characterized in that: The assembly includes a housing (1), in which a vertical nozzle assembly (2) and a horizontal nozzle assembly (3) are vertically arranged. The ends of the vertical nozzle assembly (2) and the horizontal nozzle assembly (3) away from the shot blasting end are connected to a hose (4). The hose (4) extends outside the housing (1) and connects to the shot blasting power device. The vertical nozzle assembly (2) extends into the volute cavity of the volute (5), and the horizontal nozzle assembly (3) extends from the drain pipe (6) of the volute (5). The vertical nozzle assembly (2) and the horizontal nozzle assembly (3) blast shot simultaneously, and the vertical nozzle assembly (2) rotates while blasting shot. The shot blasting power device is used to send iron shot into the vertical nozzle assembly (2) and the horizontal nozzle assembly (3) by compressed air.

2. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 1, characterized in that: A fixing plate (7) is fixedly installed inside the housing (1). A vertical nozzle assembly (2) is installed on the fixing plate (7). The vertical nozzle assembly (2) includes a vertical nozzle (8) and a horizontal nozzle (9) fixedly installed at the bottom of the vertical nozzle (8). The top end of the vertical nozzle (8) is rotatably connected to the fixing plate (7). A driving device is installed on the horizontal nozzle (9), and a transmission device is installed on the vertical nozzle (8). A reset device is installed on the transmission device. The reset device is used to drive the transmission device to move when the horizontal nozzle (9) is not shot blasting. The transmission device drives the driving device to reset.

3. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 2, characterized in that: The drive device includes hinge rods (10) hinged to both sides of the horizontal nozzle (9). The two hinge rods (10) extend to the front side of the horizontal nozzle (9) and a baffle (11) is fixedly provided between them. When not shot blasting, the reset device drives the drive device to reset through the transmission device. At this time, the baffle (11) is in an inclined state to block the mouth of the horizontal nozzle (9). A drive block (12) is fixedly provided at one end of the hinge rod (10) near the vertical spray pipe (8).

4. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 2, characterized in that: The transmission device includes a drive sleeve (13), which is threadedly connected to the vertical nozzle (8). A guide rod (14) is fixedly provided on the upper end face of the drive sleeve (13), and the guide rod (14) is inserted into the fixed plate (7). The drive sleeve (13) slides up and down relative to the fixed plate (7) through the guide rod (14).

5. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 4, characterized in that: The vertical nozzle (8) has a threaded groove (15) on its outer surface. A limit post (16) is fixedly provided on the inner side wall of the drive sleeve (13). The inner end of the limit post (16) is adapted to the threaded groove (15) and located in the threaded groove (15). The drive sleeve (13) is threadedly connected to the vertical nozzle (8) through the cooperation of the limit post (16) and the threaded groove (15).

6. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 4, characterized in that: The reset device includes a reset spring (17) sleeved on a guide rod (14) located between the fixed plate (7) and the drive sleeve (13).

7. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 2, characterized in that: The fixed plate (7) has a through hole. The top end of the vertical spray pipe (8) is rotatably connected to the fixed plate (7) through a bearing (19) fixedly embedded in the through hole. A connecting pipe (18) is fixedly embedded at the top end of the through hole of the fixed plate (7). The hose (4) is fixedly connected to the connecting pipe (18).

8. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 1, characterized in that: The horizontal nozzle assembly (3) includes a base (20) fixedly installed on the bottom wall of the housing (1). A hydraulic telescopic rod (21) is fixedly installed on the side of the base (20). A moving rod (22) is fixedly installed through the output end of the hydraulic telescopic rod (21) through the base (20). A moving nozzle (23) is fixedly installed on the moving rod (22). One end of the moving nozzle (23) away from the volute (5) is connected to the hose (4). The shot blasting power device can input high-speed iron shot and compressed air into the moving nozzle (23) and spray it out through the hose (4).

9. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 1, characterized in that: The lower end face of the box (1) is fixedly provided with a collection cover (25) with a large opening at the top and a small opening at the bottom, and the inner bottom wall of the box (1) is a mesh grid (24).

10. The automatic shot blasting device for the inner cavity of the VTG structure volute according to claim 1, characterized in that: The box (1) is equipped with a manual shot blasting gun (30), which is connected to the shot blasting power device through a hose (4); two hand holes (31) are opened on the front side of the box (1), and work gloves are fixedly installed on the hand holes (31).

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