Polishing treatment device based on nodular cast iron profile surface and using method

Abstract

The invention relates to the technical field of polishing devices, in particular to a polishing treatment device based on the surface of a spheroidal graphite cast iron profile and a using method.The polishing treatment device comprises a driving assembly and a suction assembly, the upper end of the suction assembly is fixedly connected with a first protection assembly, and the left side of the first protection assembly is fixedly connected with a cylinder body of an electric hydraulic cylinder; polishing equipment is fixedly connected to the inner side of the first protection assembly, a second protection assembly is fixedly connected to the tail end of a piston rod of the electric hydraulic cylinder, the first protection assembly comprises a protection frame, an embedded groove is formed in the inner side of the protection frame, the inner side of the embedded groove is fixedly connected with a cylinder body of a servo electric cylinder, and a push disc is fixedly connected to the tail end of a piston rod of the servo electric cylinder; according to the long nodular cast iron pipe fitting polishing device, a polishing operation area can be comprehensively sealed, dust generated by long nodular cast iron pipe fitting polishing is effectively prevented from diffusing outwards, the dust isolation problem caused by the length of a pipe fitting is successfully solved, and the safety and cleanliness of the operation environment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of polishing equipment technology, specifically to a polishing treatment device and method for the surface of ductile iron profiles. Background Technology

[0002] Ductile iron profiles are high-performance cast iron profiles produced through special processes such as horizontal continuous casting. The graphite inside is spheroidized and evenly distributed in a spherical shape. They combine the good casting performance and wear resistance of cast iron with the high strength, toughness and impact resistance of steel. They have advantages such as high dimensional accuracy, dense structure, stable mechanical properties and small machining allowance. They are widely used in machinery manufacturing, automotive industry, rail transportation, construction machinery and other fields. They can be used to manufacture key components such as gears, shafts, housings, wear-resistant liners and can meet the requirements of harsh working conditions such as heavy load, wear resistance and fatigue resistance.

[0003] Polishing devices for ductile iron profiles are specialized equipment adapted to the characteristics of these profiles to remove surface sand particles, oxide scale, and burrs. They are typically based on a worktable or external frame, equipped with adjustable clamping and limiting components and polishing execution components. Some also have a debris or dust collection structure. These devices can adapt to different specifications of profiles through components such as sliding limit rods and arc-shaped clamping plates. Polishing is completed by components such as polishing brushes and magnetic polishing rollers. Some devices are equipped with drive structures such as electric push rods and drive motors to adjust the polishing angle and position. Some also have storage bins, fans, and dust collection boxes to promptly handle the debris and dust generated during polishing, thereby improving polishing efficiency and accuracy while ensuring operational safety and environmental cleanliness.

[0004] When polishing long ductile iron pipes, a large amount of suspended dust is generated. Due to the length of the pipes, the effective coverage of traditional single-machine air collection hoods or suction arms is limited, making it difficult to fully cover the entire polishing station. If this dust cannot be treated in a timely and effective manner, it will spread to the surrounding environment and seriously damage the working environment of the work area. Therefore, in order to address the above problems, a polishing treatment device and method based on the surface of ductile iron profiles are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a polishing apparatus and method for the surface of ductile iron profiles, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A polishing device for ductile iron profiles includes a drive assembly and a suction assembly. A first protective assembly is fixedly connected to the upper end of the suction assembly. The left side of the first protective assembly is fixedly connected to the cylinder body of an electric hydraulic cylinder. A polishing device is fixedly connected to the inner side of the first protective assembly. A second protective assembly is fixedly connected to the end of the piston rod of the electric hydraulic cylinder. The first protective assembly includes a protective frame. An embedding groove is formed on the inner side of the protective frame. The inner side of the embedding groove is fixedly connected to the cylinder body of a servo electric cylinder. A push plate is fixedly connected to the end of the piston rod of the servo electric cylinder. A rubber sealing ring is fixedly connected to the outer side of the push plate. A vent is formed at the upper end of the protective frame near the embedding groove. A sealing airbag, a second rubber pad, and a collar are fixedly connected to the upper end of the protective frame.

[0008] As a further optimization of the present invention, the driving component includes a linear motor, a chuck is slidably connected to the inner side of the linear motor, a ductile iron pipe is fixedly connected to the chuck by a jaw, and the ductile iron pipe is inserted into the inside of the collar.

[0009] As a further optimization of the present invention, the suction assembly includes a bottom box, an assembly groove is provided at the right end of the bottom box, a first rubber pad is fixedly connected to one side of the assembly groove, and a shell is fixedly connected to the inside of the assembly groove, and the shell is sealed to the bottom box by the first rubber pad.

[0010] As a further optimization of the present invention, a groove is provided on the inner side of the outer shell, a filter plate is fixedly connected inside the groove of the outer shell, and a fan is fixedly connected to the right side of the outer shell.

[0011] As a further optimization of the present invention, the top of the base box is fixedly connected to the bottom of the protective frame, the inner side of the base box is connected to the inner side of the protective frame, and the left end of the base box is fixedly connected to the cylinder body of the electric hydraulic cylinder.

[0012] As a further optimization of the present invention, the second protective component includes a cover plate, an air inlet is provided on the inner side of the cover plate, a rubber duckbill valve is fixedly connected to the inner side of the air inlet, a side plate is fixedly connected to the bottom end of the cover plate, and a guide rod is fixedly connected to one side of the side plate.

[0013] As a further optimization of the present invention, the internal structure of the side plate is the same as that of the protective frame, the side plate and the protective frame are aligned vertically, and the left side of the side plate is fixedly connected to the end of the piston rod of the electric hydraulic cylinder.

[0014] As a further optimization of the present invention, the guide rod is slidably connected to the slide fixed to the side of the protective frame, and the guide rod is offset from the ductile iron pipe.

[0015] As a further optimization of the present invention, the embedded groove is connected to the inner side of the sealing airbag through the vent, the protective frame has a groove near the sealing airbag, the sealing airbag is embedded in the groove of the protective frame, and the center of the collar is flush with the top of the protective frame.

[0016] Method of using a polishing device for ductile iron profiles;

[0017] Step 1: When installing the ductile iron pipe, insert the ductile iron pipe into the two collars, align the rear end of the ductile iron pipe with the jaws of the chuck, and fix the ductile iron pipe with the jaws of the chuck. Start the electric hydraulic cylinder, which drives the second protective assembly to move downward as a whole. The guide rod slides inside the slide of the protective frame, and the bottom end of the side plate is close to the protective frame and in contact with the second rubber pad. Start the servo cylinder, which drives the push plate to move upward. The push plate is sealed with the protective frame by the rubber sealing ring. The upward movement of the push plate pushes the air embedded in the groove to enter the interior of the sealing airbag through the vent. The sealing airbag expands and is tightly in contact with the outside of the ductile iron pipe. Control the servo cylinder inside the side plate, and the two sealing airbags are in contact with each other and the sealing airbags are in contact with the second rubber pad.

[0018] Step 2: When collecting dust, start the fan to expel the gas inside the bottom box and the protective frame. The suction component, the first protective component and the second protective component are sealed. The start of the fan causes negative pressure to be generated in the sealed space. The rubber duckbill valve is opened by the negative pressure, and the outside air enters the sealed space through the air inlet. The dust is filtered through the filter plate.

[0019] Step 3: When polishing multiple locations on the ductile iron pipe, after the polishing equipment stops working for a certain period of time, the servo electric cylinder is started to drive the push plate to move upward. The negative pressure is generated inside the embedded groove, and the gas inside the sealing airbag flows back into the embedded groove through the vent. The sealing airbag deforms and deflates, and the inner side of the sealing airbag moves away from the outer side of the ductile iron pipe. The chuck motor controls the rotation of the ductile iron pipe, and the linear motor controls the position of the ductile iron pipe. After adjustment, the sealing airbag is reset.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, the device can form a complete seal for the polishing operation area by setting airbags, protective frames and cover plates, effectively preventing the dust generated during the polishing of long ductile iron pipes from spreading to the outside, solving the problem of dust isolation caused by the long length of pipes, and significantly improving the safety and cleanliness of the working environment.

[0022] 2. In this invention, the device can prevent dust from floating upwards and eroding the polishing equipment by setting up a fan and filter plate, thus extending the service life of the equipment. At the same time, it can concentrate the dust and guide it to the filter plate for filtration and collection, which is convenient for unified treatment later. It can also balance the air pressure in the sealed space and prevent the equipment from deforming due to thermal expansion.

[0023] 3. In this invention, by using a servo electric cylinder, a push plate, and a rubber sealing ring, the device can first control the sealing airbag to deflate and detach from the surface of the pipe fitting, and then perform rotation and displacement adjustment of the pipe fitting. After adjustment, the sealing airbag is reset, which effectively avoids wear and cracking problems caused to the sealing airbag during pipe fitting displacement or torsion, greatly improves the service life of the sealing airbag, and ensures the long-term stable use of the sealing structure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall exploded structure of the present invention;

[0026] Figure 3 This is a cross-sectional structural diagram of the second protective component of the present invention;

[0027] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at point A;

[0028] Figure 5 This is a schematic diagram of the structure of the electric hydraulic cylinder of the present invention;

[0029] Figure 6 This is a schematic diagram of the filter plate structure of the present invention;

[0030] Figure 7 This is a cross-sectional structural diagram of the suction component of the present invention;

[0031] Figure 8 This is a cross-sectional structural diagram of the first protective component of the present invention;

[0032] Figure 9 For the present invention Figure 8 A schematic diagram of the structure at point B.

[0033] In the diagram: 1. Drive assembly; 11. Linear motor; 12. Chuck; 13. Ductile iron pipe;

[0034] 2. Suction assembly; 21. Base box; 22. Assembly slot; 23. First rubber pad; 24. Outer shell; 25. Filter plate; 26. Fan;

[0035] 3. First protective component; 31. Protective frame; 32. Embedded groove; 33. Servo electric cylinder; 34. Push plate; 35. Rubber sealing ring; 36. Vent; 37. Sealing airbag; 38. Second rubber pad; 39. Collar;

[0036] 4. Electric hydraulic cylinders; 5. Polishing equipment;

[0037] 6. Second protective component; 61. Cover plate; 62. Air inlet; 63. Rubber duckbill valve; 64. Side plate; 65. Guide rod. Detailed Implementation

[0038] 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.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Please see Figures 1-9 The present invention provides a technical solution:

[0041] The polishing device and method for ductile iron profiles include a drive assembly 1 and a suction assembly 2. A first protective assembly 3 is fixedly connected to the upper end of the suction assembly 2. The left side of the first protective assembly 3 is fixedly connected to the cylinder body of an electric hydraulic cylinder 4. A polishing device 5 is fixedly connected to the inner side of the first protective assembly 3. A second protective assembly 6 is fixedly connected to the end of the piston rod of the electric hydraulic cylinder 4. The first protective assembly 3 includes a protective frame 31. An embedding groove 32 is provided on the inner side of the protective frame 31. The inner side of the embedding groove 32 is fixedly connected to the cylinder body of a servo electric cylinder 33. A push plate 34 is fixedly connected to the end of the piston rod of the servo electric cylinder 33. A rubber sealing ring 35 is fixedly connected to the outer side of the push plate 34. A vent 36 is provided at the upper end of the protective frame 31 near the embedding groove 32. A sealing airbag 37, a second rubber pad 38, and a collar 39 are fixedly connected to the upper end of the protective frame 31.

[0042] As a further implementation of this solution, the drive component 1 includes a linear motor 11, with a chuck 12 slidably connected to the inner side of the linear motor 11. The chuck 12 is fixedly connected to a ductile iron pipe 13 via jaws. The ductile iron pipe 13 is inserted into the inside of the collar 39. Through the above configuration, the jaws of the chuck 12 can achieve a stable clamping of the ductile iron pipe 13. Combined with the sliding adjustment function of the linear motor 11, the polishing position of the pipe can be precisely adjusted. The collar 39 can assist in limiting and guiding the pipe to avoid displacement of the pipe during the polishing process and ensure polishing accuracy.

[0043] As a further implementation of this solution, the suction assembly 2 includes a bottom box 21. An assembly groove 22 is provided at the right end of the bottom box 21. A first rubber gasket 23 is fixedly connected to one side of the assembly groove 22. An outer shell 24 is fixedly connected to the inside of the assembly groove 22. The outer shell 24 is sealed to the bottom box 21 by the first rubber gasket 23. Through the above arrangement, the first rubber gasket 23 can enhance the sealing performance between the outer shell 24 and the bottom box 21, prevent dust from leaking from the assembly gap of the assembly groove 22, ensure the negative pressure stability of the sealed space, and provide a sealing basis for efficient dust collection.

[0044] As a further implementation of this solution, a groove is provided on the inner side of the outer shell 24, and a filter plate 25 is fixedly connected inside the groove of the outer shell 24. A fan 26 is fixedly connected to the right side of the outer shell 24. Through the above settings, the fan 26 can drive the sealed space to form a negative pressure, accelerate the movement of dust towards the filter plate 25, and the filter plate 25 can effectively intercept and filter the dust, realize the centralized collection of dust, which is convenient for unified treatment in the later stage, and can prevent dust from contaminating the polishing equipment 5 or spreading to the external environment.

[0045] As a further implementation of this solution, the top of the base box 21 is fixedly connected to the bottom of the protective frame 31, the inner side of the base box 21 is connected to the inner side of the protective frame 31, and the left end of the base box 21 is fixedly connected to the cylinder body of the electric hydraulic cylinder 4. Through the above settings, the connection design between the base box 21 and the protective frame 31 can form an integrated dust collection channel, ensuring that dust enters the filtration area smoothly. At the same time, the base box 21 provides a stable installation base for the electric hydraulic cylinder 4, ensuring the stability of the lifting and adjustment of the second protective component 6.

[0046] As a further implementation of this solution, the second protective component 6 includes a cover plate 61, an air inlet 62 is provided on the inner side of the cover plate 61, a rubber duckbill valve 63 is fixedly connected to the inner side of the air inlet 62, a side plate 64 is fixedly connected to the bottom of the cover plate 61, and a guide rod 65 is fixedly connected to one side of the side plate 64. Through the above settings, the air inlet 62 can introduce external air to balance the air pressure of the sealed space, avoiding deformation of the equipment due to thermal expansion. The rubber duckbill valve 63 can prevent dust from overflowing in the opposite direction. The guide rod 65 provides guidance and limit for the lifting and lowering of the second protective component 6, ensuring the sealing and fitting accuracy.

[0047] As a further implementation of this solution, the internal structure of the side plate 64 is the same as that of the protective frame 31. The side plate 64 and the protective frame 31 are aligned vertically. The left side of the side plate 64 is fixedly connected to the end of the piston rod of the electric hydraulic cylinder 4. With the above settings, the side plate 64 and the protective frame 31 have the same structure and are aligned vertically. Double sealing can be achieved through synchronous control to improve the overall sealing effect. The electric hydraulic cylinder 4 drives the side plate 64 to rise and fall flexibly and conveniently, adapting to the sealing requirements of pipe fittings of different specifications.

[0048] As a further implementation of this solution, the guide rod 65 is slidably connected to the slide fixed on the side of the protective frame 31, and the guide rod 65 is offset from the ductile iron pipe 13. Through the above settings, the sliding cooperation between the guide rod 65 and the slide fixed on the side of the protective frame 31 can limit the lifting trajectory of the second protective component 6, avoid deviation or jamming during movement, and the offset design with the ductile iron pipe 13 can prevent interference with the installation and rotation of the pipe fittings, ensuring smooth operation.

[0049] As a further implementation of this solution, the embedded groove 32 is connected to the inner side of the sealing airbag 37 through the vent 36. The protective frame 31 has a groove near the sealing airbag 37, and the sealing airbag 37 is embedded in the groove of the protective frame 31. The center of the collar 39 is flush with the top of the protective frame 31. Through the above settings, the connection between the embedded groove 32 and the vent 36 can realize the rapid inflation and deflation of the sealing airbag 37, ensuring the convenience of sealing and unlocking. The groove of the protective frame 31 provides a stable installation space for the sealing airbag 37. The flush alignment of the center of the collar 39 with the top of the protective frame 31 can assist in the precise positioning of the pipe, ensuring that the sealing airbag 37 fits tightly with the pipe and improving the sealing reliability.

[0050] Workflow: When installing the ductile iron pipe 13, first insert the ductile iron pipe 13 into the two collars 39, aligning the rear end of the ductile iron pipe 13 with the jaws of the chuck 12, and fix the ductile iron pipe 13 using the jaws of the chuck 12. This achieves the effect of fixing the ductile iron pipe 13. At this time, start the electric hydraulic cylinder 4, which drives the second protective component 6 to move downward as a whole. During this process, the guide rod 65 slides inside the slide seat of the protective frame 31, thus limiting the downward movement of the second protective component 6 until the bottom end of the side plate 64 approaches the protective frame 31 and is in contact with the second rubber pad 38. At this time, most of the horizontal perimeter of the side plate 64 and the protective frame 31 is sealed. Then, start the servo cylinder 33, which drives the push plate 34 to move upward. The push plate 34 is sealed with the protective frame 31 by the rubber sealing ring 35. 4. When moving upwards, the air inside the embedded groove 32 near the upper end of the push plate 34 will enter the interior of the sealing airbag 37 through the vent 36. At this time, the sealing airbag 37 expands and can fit tightly against the outside of the ductile iron pipe 13, thus achieving a sealing effect between the protective frame 31 and the ductile iron pipe 13. The servo electric cylinder 33 inside the side plate 64 is controlled by the same principle as above. At this time, the sealing airbag 37 inside the side plate 64 also expands. At this time, the two sealing airbags 37 fit together and fit between the sealing airbags 37 and the second rubber pad 38, achieving a sealing effect between the cavity inside the protective frame 31 and the cover plate 61. The surface of the ductile iron pipe 13 is polished by the CNC polishing equipment 5, which can prevent the dust generated during polishing from floating into the outside air. This protective structure avoids the phenomenon that dust cannot be isolated due to the long length of the pipe, and improves the safety of the working environment.

[0051] When collecting dust, the fan 26 is started. The fan 26 discharges the gas inside the bottom box 21 and the protective frame 31 to the outside of the bottom box 21. Since the space between the suction component 2, the first protective component 3 and the second protective component 6 is sealed, a negative pressure is generated in the sealed space after the fan 26 is started. Under the action of the negative pressure, the rubber duckbill valve 63 is opened by pressure, and the outside air enters the sealed space through the air inlet 62. This setting can not only prevent the cavity inside the bottom box 21, the protective frame 31 and the cover plate 61 from deforming due to heat expansion, but also transport the air from top to top to prevent the dust from floating upward and affecting the service life of the polishing equipment 5. When the dust is transported through the filter plate 25, the dust is filtered and the dust is concentrated on the left end surface of the filter plate 25 for convenient centralized treatment later.

[0052] When polishing multiple locations of the ductile iron pipe 13, after the polishing equipment 5 stops working for a certain period of time, the dust inside the bottom box 21, protective frame 31, and cover plate 61 is concentrated inside the filter plate 25 by the suction of the fan 26. Then, the servo cylinder 33 is started to drive the push plate 34 to move upward. During this process, a negative pressure is generated inside the embedded groove 32, and the gas inside the sealing airbag 37 flows back into the embedded groove 32 through the vent 36. At this time, the sealing airbag 37 is deformed and deflated, and the inner side of the sealing airbag 37 is far away from the outer side of the ductile iron pipe 13. The ductile iron pipe 13 is rotated by the motor controlled by the chuck 12, and the position of the ductile iron pipe 13 is controlled by the linear motor 11. After adjustment, the sealing airbag 37 is reset and polished again. This process can prevent the ductile iron pipe 13 from causing wear or cracking of the sealing airbag 37 due to displacement or torsion, and improve the service life of the sealing airbag 37.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Device for polishing the surface of a spheroidal graphite cast iron profile, comprising a drive assembly (1) and a suction assembly (2), characterized in that: The upper end of the suction assembly (2) is fixedly connected with a first protection assembly (3), the left side of the first protection assembly (3) is fixedly connected with the cylinder body of an electric hydraulic cylinder (4), the inner side of the first protection assembly (3) is fixedly connected with a polishing device (5), and the end of the piston rod of the electric hydraulic cylinder (4) is fixedly connected with a second protection assembly (6). The first protection assembly (3) comprises a protection frame (31), an embedded groove (32) is formed in the inner side of the protection frame (31), the cylinder body of a servo electric cylinder (33) is fixedly connected to the inner side of the embedded groove (32), a push disc (34) is fixedly connected to the end of the piston rod of the servo electric cylinder (33), a rubber sealing ring (35) is fixedly connected to the outer side of the push disc (34), an air vent (36) is formed in the upper end of the protection frame (31) close to the embedded groove (32), and a sealing air bag (37), a second rubber pad (38) and a sleeve ring (39) are fixedly connected to the position close to the upper end of the protection frame (31).

2. The apparatus for polishing the surface of a spherulitic cast iron section according to claim 1, wherein: The driving assembly (1) comprises a linear motor (11), the inner side of the linear motor (11) is slidingly connected with a chuck (12), the chuck (12) is fixedly connected with a nodular cast iron pipe (13) through a jaw, and the nodular cast iron pipe (13) is inserted into the inside of the sleeve ring (39).

3. The apparatus for polishing the surface of a ductile cast iron section according to claim 1, wherein: The suction assembly (2) comprises a bottom box (21), an assembly groove (22) is formed in the right end of the bottom box (21), a first rubber pad (23) is fixedly connected to one side of the assembly groove (22) formed in the bottom box (21), an outer shell (24) is fixedly connected to the inner side of the assembly groove (22), and the outer shell (24) is sealed with the bottom box (21) through the first rubber pad (23).

4. The apparatus for polishing the surface of a spherulitic cast iron section according to claim 3, wherein: A groove is formed in the inner side of the outer shell (24), a filter plate (25) is fixedly connected to the inside of the groove of the outer shell (24), and a fan (26) is fixedly connected to the right side of the outer shell (24).

5. The apparatus for polishing the surface of a spherulitic cast iron section according to claim 3, wherein: The top end of the bottom box (21) is fixedly connected with the bottom end of the protection frame (31), the inner side of the bottom box (21) is in communication with the inner side of the protection frame (31), and the left end of the bottom box (21) is fixedly connected with the cylinder body of the electric hydraulic cylinder (4).

6. The apparatus for polishing a surface of a ductile iron section according to claim 1, wherein: The second protection assembly (6) comprises a cover plate (61), an air inlet (62) is formed in the inner side of the cover plate (61), a rubber duckbill valve (63) is fixedly connected to the inner side of the air inlet (62), a side plate (64) is fixedly connected to the bottom end of the cover plate (61), and a guide rod (65) is fixedly connected to one side of the side plate (64).

7. The apparatus for polishing the surface of a spherulitic cast iron section according to claim 6, wherein: The internal structure of the side plate (64) is the same as that of the protection frame (31), the side plate (64) is aligned with the protection frame (31) up and down, and the left side of the side plate (64) is fixedly connected with the end of the piston rod of the electric hydraulic cylinder (4).

8. The apparatus for polishing the surface of a spherulitic cast iron section according to claim 6, wherein: The guide rod (65) is slidingly connected with the sliding seat fixed to the side of the protection frame (31), and the guide rod (65) is deviated from the nodular cast iron pipe (13).

9. The apparatus for polishing a surface of a ductile cast iron section according to claim 1, wherein: The embedded groove (32) is communicated with the inside of the sealing air bag (37) through the air vent (36), the protective frame (31) is provided with a groove near the position of the sealing air bag (37), the sealing air bag (37) is embedded in the groove of the protective frame (31), and the center of the sleeve ring (39) is flush with the top end of the protective frame (31).

10. Use of a device for polishing a surface of a spherulitic cast iron profile according to any one of claims 1 to 9, characterized in that: Step one: when the ductile cast iron pipe (13) is installed, the ductile cast iron pipe (13) is inserted into the inside of the two sleeve rings (39), the end of the rear end of the ductile cast iron pipe (13) is aligned between the clamping jaws of the chuck (12), the ductile cast iron pipe (13) is fixed through the clamping jaws of the chuck (12), the electric hydraulic cylinder (4) is started, the electric hydraulic cylinder (4) drives the second protective assembly (6) to move downward as a whole, the guide rod (65) slides in the sliding seat of the protective frame (31), the bottom end of the side plate (64) is close to the protective frame (31) and is attached to the second rubber pad (38), the servo cylinder (33) is started, the servo cylinder (33) drives the push disc (34) to move upward, the push disc (34) is sealed with the protective frame (31) through the rubber sealing ring (35), the push disc (34) moves upward to push the air embedded in the embedded groove (32) to enter the inside of the sealing air bag (37) through the air vent (36), the sealing air bag (37) expands, the sealing air bag (37) is attached to the outside of the ductile cast iron pipe (13), the servo cylinder (33) in the side plate (64) is controlled, the two sealing air bags (37) are attached, and the sealing air bags (37) are attached between the second rubber pads (38); Step two: when the dust is collected, the fan (26) is started to exhaust the gas in the bottom box (21) and the protective frame (31), the suction assembly (2), the first protective assembly (3) and the second protective assembly (6) are sealed, the fan (26) is started to cause negative pressure in the sealed space, the rubber duckbill valve (63) is opened under the negative pressure, the external air enters the inside of the sealed space through the air inlet (62), and the dust is filtered through the filter plate (25); Step three: when the ductile cast iron pipe (13) is polished at multiple positions, the polishing equipment (5) is stopped for a period of time, the servo cylinder (33) is started to drive the push disc (34) to move upward, negative pressure is generated in the embedded groove (32), the gas in the sealing air bag (37) flows back to the inside of the embedded groove (32) through the air vent (36), the sealing air bag (37) is deformed and shrinks, the inside of the sealing air bag (37) is away from the outside of the ductile cast iron pipe (13), the motor of the chuck (12) controls the rotation of the ductile cast iron pipe (13), the linear motor (11) controls the position of the ductile cast iron pipe (13), and the sealing air bag (37) is reset after adjustment.

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