Clamping type inside-outside cleaning machine for axle

Abstract

The application relates to the technical field of axle production, and discloses a clamping type axle inner-spraying and outer-throwing cleaning machine which comprises a cleaning cavity and a trolley, the cleaning cavity is provided with a cabin door which can be opened and closed, a recycling assembly is connected to the bottom of the cleaning cavity, a thrower assembly for cleaning the outer surface of the axle is arranged on the upper portion of the cleaning cavity, the thrower assembly can swing along the axial direction of the axle during work, and a lifting object table is arranged on the trolley. The clamping type axle inner-spraying and outer-throwing cleaning machine integrates the thrower assembly and the shot blasting assembly in the same cleaning cavity, cooperates with the clamping assembly which can clamp the axle and drive the axle to rotate, realizes synchronous cleaning operation of the inner and outer surfaces of the axle, the shot blasting assembly adopts a shot blasting pipe and an auxiliary pipe in a cooperative working mode, the auxiliary pipe can generate negative pressure to recycle pollutants in real time and can be switched to a reverse shot blasting mode to clean dead corners, and the problems of low efficiency of step-by-step treatment of the inner and outer surfaces and cleaning difficulty of the complex structure of the inner cavity of the axle in the traditional process are solved.

Description

Technical Field

[0001] This application relates to the field of axle manufacturing technology, and in particular to a clamping axle internal spraying and external throwing cleaning machine. Background Technology

[0002] As a core load-bearing component of the automotive chassis system, the surface quality of the axle directly affects the safety, durability, and reliability of the entire vehicle. Surface treatment is an indispensable and crucial process in axle manufacturing, primarily employing mechanical cleaning methods such as shot peening, sandblasting, and shot blasting. The core objectives of these processes are twofold: first, to thoroughly remove contaminants such as oxide scale, rust, and welding slag generated on the axle surface during previous processes like casting, welding, and heat treatment; and second, to significantly improve surface roughness by creating uniform micro-pits on the metal surface through high-speed shot impact, providing an ideal anchoring structure for subsequent painting processes and greatly enhancing coating adhesion.

[0003] Currently, the surface treatment of vehicle axles generally adopts a process mode of separating the inner and outer surfaces. Specifically, the exterior of the axle is first thoroughly cleaned using a shot blasting gun or shot blaster, and then the interior is treated using a telescopic shot blasting pipe or a rotating nozzle. The axle needs to be transferred, repositioned, and clamped between two independent workstations, resulting in a long auxiliary time for each product, which seriously restricts the overall cycle time of the production line. Furthermore, it requires two independent shot blasting equipment, dust removal systems, and shot recovery devices, leading to relatively high equipment investment costs.

[0004] On the other hand, the internal structure of the axle housing generally contains complex structures such as reinforcing ribs, partitions, and bearing housing supports. While these structures are crucial to the mechanical performance of the axle, they also pose significant challenges to internal cavity cleaning. Firstly, the angled areas formed by the reinforcing ribs and the inner wall of the housing, the concealed spaces behind the partitions, and the root of the bearing housing are prone to becoming shot peening dead zones. High-speed shot cannot directly impact these areas, resulting in the residue of contaminants such as oxide scale and molding sand, affecting the quality of subsequent treatments. Furthermore, oxide scale, dust, and broken shot particles that detach during cleaning easily accumulate in low-velocity areas such as the back of the partitions and the root of the reinforcing ribs, forming "secondary pollution sources." This necessitates additional manual cleaning or high-pressure air blowing, increasing labor costs and production cycles. Human error can also lead to inconsistent quality. Summary of the Invention

[0005] This application proposes a clamping-type internal and external shot blasting cleaning machine for vehicle axles. By integrating shot blasting and shot peening components in the same cleaning chamber, and cooperating with a clamping component that can clamp the vehicle axle and drive it to rotate, synchronous cleaning of the inner and outer surfaces of the vehicle axle is achieved. At the same time, the shot peening component adopts a collaborative working mode of shot peening pipe and auxiliary pipe. The auxiliary pipe can generate negative pressure to recover contaminants in real time, and can also switch to reverse shot peening to clean dead corners. This solves the problems of low efficiency of step-by-step treatment of inner and outer surfaces and difficulty in cleaning the complex structure of the inner cavity of the vehicle axle in traditional processes.

[0006] To achieve the above objectives, this application adopts the following technical solution: a clamping type vehicle axle internal spraying and external blasting cleaning machine, comprising a cleaning chamber and a trolley, wherein the cleaning chamber has an openable and closable hatch, a recovery assembly is connected to its bottom, and a shot blasting assembly for cleaning the outer surface of the vehicle axle is provided on its upper part, wherein the shot blasting assembly can swing along the axial direction of the vehicle axle when working, and the trolley is provided with a lifting platform, the platform being used to support the vehicle axle;

[0007] Also includes:

[0008] At least one set of clamping units, each set of clamping units having two clamping assemblies arranged on opposite sides and collinearly, the clamping assemblies being axially movable and rotating about their own center, the clamping assemblies corresponding to the axle when the trolley stops in the cleaning chamber, the clamping assemblies having hollow axial channels;

[0009] The shot peening assembly, which can pass through the axial channel of the clamping assembly and be inserted into the axle cavity from the end of the axle, includes a shot peening pipe and an auxiliary pipe. The shot peening pipe is connected to the shot peening machine to perform shot peening operations, and the auxiliary pipe is connected to a negative pressure machine to generate negative pressure while the shot peening pipe is performing shot peening, for drawing in the airflow, shot, and dust ejected from the shot peening pipe.

[0010] Furthermore, the clamping assembly includes a clamping tube with a clamping head at one end. The clamping tube is connected to a drive module, which can drive the clamping tube to move axially and rotate. The clamping head is conical, circumferentially divided into three segments with gaps between the segments. This ensures reliable clamping, and when the axle is released, it slides downwards along the sidewall of the clamping head, preventing the axle from falling too quickly and causing deformation due to a sudden drop.

[0011] Furthermore, the shot peening assembly also includes a protective tube, with an auxiliary tube and a shot peening tube located inside the protective tube and moving with it. The protective tube is connected to a second moving block driven by a servo structure. The movement of the protective tube causes the auxiliary tube and the shot peening tube to move synchronously, while preventing shot rebound from eroding the pipe wall and increasing the service life of the pipeline.

[0012] Furthermore, the shot peening pipe is located to the left or right of the protective pipe axis, with a bend angle of 30-75 degrees. After passing the protective pipe axis, it continues to extend towards the inner wall of the axle. The auxiliary pipe is located above the protective pipe axis, with its bend pointing downwards. The two pipes are staggered to avoid interference, improving space utilization and increasing the diameter at the bend.

[0013] Furthermore, the auxiliary pipe connects to the negative pressure machine and the shot peening machine via a connector, allowing for selective connection to either. The auxiliary pipe includes a pipe body with a reverse nozzle capable of spraying backwards. Using the auxiliary pipe for shot peening in dead-angle areas simplifies the nozzle structure, reduces the frequency of use of large-angle bends, increases the service life of the bends, and reduces maintenance frequency.

[0014] Furthermore, during shot peening, the protective pipe moves to the innermost side of the axle, connecting the shot peening pipe to the shot peening machine and the auxiliary pipe to the negative pressure system. While retracting, shot peening continues, and dust and shot are simultaneously sucked back in, completing the first shot peening operation. Subsequently, the protective pipe begins a fixed-point movement, from the outside in, using the auxiliary pipe for targeted shot peening to clean dead corners. When the protective pipe moves to the innermost side again, the auxiliary pipe connects to the negative pressure system, and the protective pipe slowly retracts for a second cleaning. This makes the shot peening operation continuous and compact, improving efficiency.

[0015] Furthermore, the auxiliary pipe also includes a suction head and a sliding plate. Both the reverse nozzle and the suction head are mounted on the sliding plate. The end of the pipe body is provided with a valve seat corresponding to the sliding plate. The sliding plate can slide along the valve seat. The two stop positions respectively connect the suction head or the reverse nozzle to the pipe body. The sliding plate is connected to a telescopic bladder. The telescopic bladder extends and retracts to drive the sliding plate to move. The telescopic bladder is connected to a pressure source through a pressure supply pipe.

[0016] Furthermore, the end of the pipe has a 90-degree bend, and the valve seat is axially arranged to facilitate the movement of the sliding plate, as well as the setting of the reverse nozzle and the dust suction head.

[0017] Furthermore, a valve plate is fixedly connected to the bottom of the sliding plate, and the protective tube has a groove corresponding to the valve plate. The end of the valve plate has a hollow area that clamps the side wall of the groove. The valve plate and the groove slide together, and at the same time, they can achieve sealing to prevent shot peening from rebounding into the protective tube. The end of the protective tube is provided with an end cap.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The shot blasting and shot peeling components are integrated within the same cleaning chamber. Together with the clamping components, they drive the axle to rotate, enabling simultaneous cleaning of the axle's inner and outer surfaces. This reduces the time required for station transfer, repositioning, and secondary clamping required for separate inner and outer surface treatment in traditional processes, improving production line cycle time and equipment utilization, and lowering production costs.

[0020] 2. The shot peening assembly adopts a collaborative working mode of shot peening pipe and auxiliary pipe. While the shot peening pipe performs shot peening operation in the inner cavity, the auxiliary pipe generates negative pressure to recover shot, remove pollutants and dust in real time, forming a closed-loop cleaning mode of spraying and suction at the same time. This effectively prevents the accumulation of pollutants in dead corner areas in traditional inner cavity shot peening, improves the cleaning quality of the inner cavity, avoids the risk of secondary pollution, and reduces the mixing of shot peening and shot blasting, reducing the difficulty of subsequent recycling. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0022] Figure 1 This is a schematic diagram of the present invention;

[0023] Figure 2 This is a side view of the present invention;

[0024] Figure 3 This is a schematic diagram of the clamping assembly in this invention;

[0025] Figure 4 This is a partial schematic diagram of the clamping assembly and shot peening assembly in this invention;

[0026] Figure 5 This is a partial schematic diagram of the shot peening assembly in this invention;

[0027] Figure 6 This is a schematic diagram of the auxiliary tube in this invention;

[0028] Figure 7 This is a schematic diagram of the connector in this invention;

[0029] Figure 8 This is a schematic diagram of the protective tube in this invention.

[0030] In the diagram: 1. Cleaning chamber; 2. Trolley; 3. Carrying platform; 4. Shot blasting assembly; 5. Clamping assembly; 510. Clamping tube; 520. Drive module; 521. First moving block; 522. Front bearing; 523. Spline; 530. Clamping head; 6. Shot peening assembly; 610. Protective tube; 620. Second moving block; 630. Auxiliary tube; 631. Tube body; 632. Valve seat; 633. Valve plate; 634. Sliding plate; 635. Telescopic bladder; 636. Pressure supply tube; 637. Back nozzle; 640. Shot peening tube; 650. Connector; 651. Connecting chamber; 652. Connecting tube; 653. Negative pressure channel; 654. Shot peening channel; 7. Recovery assembly; 8. Axle. Detailed Implementation

[0031] 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.

[0032] Example 1, please refer to Figures 1-2 A clamping type internal and external shot blasting cleaning machine for vehicle axles includes a cleaning chamber 1 and a trolley 2. The trolley 2 is equipped with a lifting platform 3, which is hydraulically driven to lift. The vehicle axle 8 is placed on the placement slot on the platform 3. Then the trolley 2 sends the vehicle axle 8 into the cleaning chamber 1. The cleaning chamber 1 has a hatch. After the hatch is closed, a vacuum is drawn. The bottom of the cleaning chamber 1 is connected to a recovery component 7, which is used to recover the shot blasting. The top of the cleaning chamber 1 is equipped with a shot blasting component 4. When the shot blasting component 4 is working, it swings along the axial direction of the vehicle axle 8 to achieve full coverage of the vehicle axle 8.

[0033] Please see Figures 3-4 Clamping components 5 are provided on both sides of the inner wall of the cleaning chamber 1. Two collinear clamping components 5 form a clamping unit. The clamping components 5 can move axially and rotate around their own center. Several sets of clamping units are provided in the cleaning chamber 1, the specific number of which is consistent with the placement position on the platform 3. A set of clamping units can just clamp the axle 8 from both ends and drive the axle 8 to rotate around its own axis. The clamping components 5 have hollow axial channels, and the shot peening assembly 6 can pass through the clamping components 5 and be inserted into the axle 8 from the end of the axle 8. The shot peening assembly 6 includes an auxiliary tube 630 and a shot peening tube 640. The shot blasting machine and the negative pressure machine are connected. The shot blasting pipe 640 can be connected to the shot blasting machine to extend into the axle 8 for shot blasting operations. The auxiliary pipe 630 can be connected to the negative pressure machine. While the shot blasting pipe 640 is performing shot blasting, the auxiliary pipe 630 generates negative pressure, which causes the airflow, shot, and dust ejected from the shot blasting pipe 640 to be sucked into the auxiliary pipe 630. The auxiliary pipe 630 is located behind the shot blasting pipe 640. The front side refers to the side where the axle 8 is located, and the rear side refers to the side away from the axle 8. The specific structures of the shot blasting machine, shot blasting machine, negative pressure machine, hopper, and recovery structure are all existing structures and will not be described in detail.

[0034] The clamping assembly 5 includes a clamping tube 510, one end of which is provided with a clamping head 530. The clamping assembly 5 clamps the axle 8 through the clamping head 530. The clamping tube 510 is connected to a drive module 520. The drive module 520 includes a first moving block 521, which slides along the support structure of the cleaning cavity 1. The side wall of the clamping tube 510 is provided with a spline 523, and the clamping tube 510 is connected to a front bearing 522 through the spline 523. The first moving block 521 is movably connected to the clamping tube 510, specifically through a bearing. The outer ring of the front bearing 522 is fixedly connected to the support structure. The movement of the first moving block 521 drives the clamping tube 510 to move. The inner ring of the front bearing 522 is fixedly connected to a transmission wheel. The transmission wheel is connected to the drive structure. In this embodiment, the transmission wheel is a gear. The clamping assembly 5 is provided with three sets. The transmission wheel on the clamping assembly 5 on the same side meshes with the horizontally placed transmission screw. The transmission screw drives the inner rings of the three sets of front bearings 522 to rotate, thereby driving the clamping tube 510 and the axle 8 to rotate (the transmission screw is not shown). In other embodiments, the transmission wheel can be directly driven by a motor.

[0035] The clamping head 530 is conical and is evenly divided into three lobes around its circumference, with a gap between the two lobes. When clamping the end of the axle 8, it can be tightened to ensure the reliability of the clamping. At the same time, when releasing the axle 8, the axle 8 slides down along the side wall of the clamping head 530 to prevent the axle 8 from falling too quickly and to prevent it from being deformed due to sudden drop.

[0036] Please see Figures 2-4 The shot peening assembly 6 also includes a protective tube 610, an auxiliary tube 630, and a shot peening tube 640 located inside the protective tube 610 and moving with it. The protective tube 610 is connected to a second moving block 620 driven by a servo structure (not shown). The second moving block 620 moves along a support structure and can be driven by a lead screw, which is moved by a servo motor, allowing for precise adjustment of its position. The shot peening tube 640 is located to the left or right of the axis of the protective tube 610. (Both axes are on the same horizontal plane). The bend angle of the shot peening pipe 640 is 30-75 degrees, and it continues to extend towards the inner wall of the axle 8 after passing the axis of the protective pipe 610. The auxiliary pipe 630 is located above the axis of the protective pipe 610. The bend of the auxiliary pipe 630 points downward. When shot peening, it can peen to the left or right without being disturbed by the dust at the bottom. When vacuuming, it can vacuum to the bottom, which can effectively collect dust, improve the space utilization rate inside the protective pipe 610, increase the radius of the bend, and reduce the erosion of the pipe wall by shot peening.

[0037] In Example 2, because dead angles easily form in areas such as the angled area between the reinforcing rib and the inner wall of the shell, the concealed space in front of the partition, and the root of the bearing seat, the nozzle's bending angle needs to be greater than 90 degrees to achieve reverse spraying and clean these dead angles. However, a large bending nozzle has high friction with the shot, making it susceptible to corrosion and resulting in a shorter service life. Requiring adjustable nozzle angles would increase equipment costs, and the confined space inside the axle 8, coupled with significant shot rebound and the harsh environment of the nozzle, would also reduce the reliability of nozzle angle adjustment. Therefore, Example 2, based on Example 1, utilizes an auxiliary tube 630 to clean the dead angle locations. Please refer to [link / reference needed]. Figures 4-8 The auxiliary pipe 630 is connected to the negative pressure machine and the shot peening machine through the connector 650. The connector 650 includes a connecting cavity 651, which is connected to the shot peening machine through the shot peening channel 654 and the negative pressure machine through the negative pressure channel 653. It is also connected to the auxiliary pipe 630 through the connecting pipe 652. The connector 650 is located outside the protective pipe 610. In order to reduce the erosion of the connector 650 by shot peening, the shot peening channel 654 and the connecting pipe 652 are collinear. The auxiliary pipe 630 includes a pipe body 631, which has a reverse nozzle 637 capable of spraying backward. When the auxiliary pipe 630 is needed for shot peening, the valve on the negative pressure channel 653 is closed and the valve on the shot peening channel 654 is opened, and the shot peening is carried out through the auxiliary pipe 630.

[0038] To facilitate shot peening control, during shot peening, the protective pipe 610 moves to the innermost side of the axle 8, the shot peening pipe 640 is connected to the shot peening machine, and the auxiliary pipe 630 is connected to the negative pressure machine. While retracting, shot peening is performed, and dust and shot are sucked back. After the stroke is completed, the protective pipe 610 begins to move in a fixed position, from the outside to the inside, using the auxiliary pipe 630 to clean the dead corners. When the protective pipe 610 moves to the innermost side again, the auxiliary pipe 630 is connected to the negative pressure, and the protective pipe 610 slowly retracts. The auxiliary pipe 630 can clean the residual dust. To ensure the cleaning effect, the protective pipe 610 can pause slightly at the dead corner position, and continue to move after the axle 8 completes one rotation, so as to avoid the presence of residue in the dead corner.

[0039] The main function of the auxiliary pipe 630 is to suck up shot and dust. However, during shot peening, a certain gap needs to be maintained between the auxiliary pipe 630 and the inner wall of the axle 8, which would affect the suction of shot and dust. Therefore, the auxiliary pipe 630 also includes a suction head 638 and a sliding plate 634. The suction head 638 is connected to a suction pipe, which is flexible and contacts the bottom of the axle 8, while also passing over partitions and reinforcing ribs. Both the reverse spray head 637 and the suction head 638 are mounted on the sliding plate 634. The end of the pipe body 631 has a valve seat 632 corresponding to the sliding plate 634. The end of the pipe body 631 has a 90-degree bend. The valve seat 632 is axially positioned, allowing the sliding plate 634 to slide along it. Two stop points connect the suction head 638 or the reverse spray head 637 to the pipe body 631. The sliding plate 634, corresponding to the position of the reverse nozzle 637, is horn-shaped. The inner diameter of the side connected to the valve seat 632 is larger and greater than the inner diameter of the pipe body 631. The inner diameter of the sliding plate 634, corresponding to the position of the suction head 638, is smaller than the inner diameter of the pipe body 631. The sliding plate 634 is connected to a telescopic bladder 635, which drives the sliding plate 634 to move and switch its position. The telescopic bladder 635 is an expansion bladder. A return spring (not shown) is provided between the sliding plate 634 and the valve seat 632. The telescopic bladder 635 is connected to a pressure source through a pressure supply pipe 636. The pressure source can be the same as the compressed gas connected to the shot peening machine or connected to a hydraulic station. When the telescopic bladder 635 expands, it pushes the sliding plate 634 to move. When the telescopic bladder 635 contracts, the sliding plate 634 is cut back under the action of the return spring.

[0040] A valve plate 633 is fixedly connected to the bottom of the sliding plate 634. The protective tube 610 is provided with a sliding groove corresponding to the valve plate 633. The end of the valve plate 633 is provided with a hollow area. The hollow area clamps the side wall of the sliding groove. The valve plate 633 and the sliding groove cooperate to slide and can achieve sealing at the same time to prevent shot peening from rebounding into the protective tube 610. The end of the protective tube 610 is provided with an end cap.

[0041] When processing the axle 8, the axle 8 is placed on the platform 3. The trolley 2 sends the platform 3 and the axle 8 into the cleaning chamber 1. The cleaning chamber 1 is equipped with a corresponding positioning structure. When the trolley 2 stops, the axle 8 on the platform 3 is aligned with each clamping assembly 5. The platform 3 is raised to send the axle 8 to the height corresponding to the clamping assembly 5. The first moving blocks 521 on both sides move axially so that the clamping heads 530 on both sides clamp the axle 8. As the auxiliary pipe 630 and the shot peening pipe 640 enter the innermost part of the axle 8, the clamping pipe 510 rotates and drives the axle 8 to rotate. At the same time, the shot blasting assembly 4 performs shot blasting operation and the shot peening assembly 6 performs shot peening operation.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping-type axle internal spraying and external throwing cleaning machine, comprising: The cleaning chamber (1) has an openable and closable hatch, a recycling assembly (7) is connected to its bottom, and a shot blasting assembly (4) for cleaning the outer surface of the axle (8) is provided on its upper part. The shot blasting assembly (4) can swing along the axial direction of the axle (8) when it is working. A trolley (2) is provided with a lifting platform (3) on which the lifting platform (3) is used to support the axle (8). Its characteristic is that it further includes: At least one set of clamping units, each set of clamping units has two clamping components (5) arranged on opposite sides and collinearly. The clamping components (5) are axially movable and rotate about their own center. When the trolley (2) stops in the cleaning chamber (1), the clamping components (5) and the axle (8) correspond. The clamping components (5) have a hollow axial channel. The shot peening assembly (6) is able to pass through the axial channel of the clamping assembly (5) and be inserted into the cavity of the axle (8) from the end of the axle (8). It includes a shot peening pipe (640) and an auxiliary pipe (630). The shot peening pipe (640) is connected to the shot peening machine for shot peening operations, and the auxiliary pipe (630) is connected to the negative pressure machine.

2. The clamping-type axle internal spraying and external throwing cleaning machine according to claim 1, characterized in that, The clamping assembly (5) includes a clamping tube (510), one end of which is provided with a clamping head (530). The clamping tube (510) is connected to a drive module (520), which can drive the clamping tube (510) to move axially and rotate. The clamping head (530) is conical and is evenly divided into three lobes in the circumference, with a gap between the two lobes.

3. The clamping-type axle internal spraying and external throwing cleaning machine according to claim 1, characterized in that, The shot peening assembly (6) also includes a protective tube (610), an auxiliary tube (630) and a shot peening tube (640) located inside the protective tube (610) and moving with the protective tube (610). The protective tube (610) is connected to a second moving block (620) driven by a servo structure.

4. The clamping-type axle internal spraying and external throwing cleaning machine according to claim 3, characterized in that, The shot peening pipe (640) is located to the left or right of the axis of the protective pipe (610). The shot peening pipe (640) has a bend angle of 30-75 degrees and continues to extend towards the inner wall of the axle (8) after passing the axis of the protective pipe (610). The auxiliary pipe (630) is located above the axis of the protective pipe (610), and the bend of the auxiliary pipe (630) points downward.

5. A clamping-type axle internal spraying and external throwing cleaning machine according to claim 3, characterized in that, The auxiliary pipe (630) is connected to the negative pressure machine and the shot peening machine via a connector (650) and can be connected to either one. The auxiliary pipe (630) includes a pipe body (631) and the pipe body (631) has a reverse nozzle (637) that can spray backward.

6. A clamping-type axle internal spraying and external throwing cleaning machine according to claim 5, characterized in that, The shot peening process consists of three steps: First, the protective pipe (610) is moved to the innermost side of the axle (8), the shot blasting pipe (640) is connected to the shot blasting machine, and the auxiliary pipe (630) is connected to the negative pressure machine. While retracting, shot blasting is performed, and dust and shot blasting are sucked back. The second step is to move the protective tube (610) to a fixed point, from the outside to the inside, and use the auxiliary tube (630) to perform shot peening at a fixed point; Third step: After completing the second step, when the protective tube (610) moves to the innermost side again, the auxiliary tube (630) is connected to the negative pressure, and the protective tube (610) slowly retracts.

7. A clamping-type axle internal spraying and external throwing cleaning machine according to claim 5, characterized in that, The auxiliary pipe (630) also includes a suction head (638) and a sliding plate (634). The reverse nozzle (637) and the suction head (638) are both mounted on the sliding plate (634). The end of the pipe body (631) is provided with a valve seat (632) corresponding to the sliding plate (634). The sliding plate (634) can slide along the valve seat (632). The two stop positions respectively connect the suction head (638) and the reverse nozzle (637) to the pipe body (631). The sliding plate (634) is connected to a telescopic bladder (635). The telescopic bladder (635) extends and retracts to drive the sliding plate (634) to move. The telescopic bladder (635) is connected to a pressure source through a pressure supply pipe (636).

8. A clamping-type axle internal spraying and external throwing cleaning machine according to claim 7, characterized in that, The end of the tube (631) has a 90-degree bend, and the valve seat (632) is axially arranged.

9. A clamping-type axle internal spraying and external throwing cleaning machine according to claim 8, characterized in that, The bottom of the sliding plate (634) is fixedly connected to a valve plate (633), and the protective tube (610) is provided with a groove corresponding to the valve plate (633). The end of the valve plate (633) is provided with an axial hollow area, and the upper and lower walls of the hollow area clamp the side wall of the groove.

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