Spheroidal graphite pipe fitting surface treatment device

Abstract

The utility model discloses a spheroidal graphite pipe fitting surface treatment device which comprises a machine frame, a plurality of sets of polishing mechanisms, a two-way conveying mechanism, two sets of containing frames and a plurality of sets of installation bases, and a treatment cavity is formed in the surface of the machine frame. The polishing mechanisms are arranged on the inner wall of the treatment cavity. The two-way conveying mechanism is arranged on the inner wall of the treatment cavity and located on the outer sides of the polishing mechanisms; the two containing frames are arranged on the surface of the two-way conveying mechanism. The multiple sets of mounting bases are arranged on the surfaces of the two sets of containing frames correspondingly and correspond to the multiple sets of grinding mechanisms in position. Therefore, the multi-station design is adopted, multiple sets of pipe bodies can be synchronously polished within one polishing time, the working efficiency is greatly improved, the uniformity and consistency of the polishing effect are ensured, and the use effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of surface treatment of ductile iron pipe fittings, in particular to a surface treatment device for ductile iron pipe fittings. Background Art

[0002] In the metal pipe manufacturing industry, ductile iron pipes have been widely used due to their excellent physical and chemical properties, such as high strength, high elongation, and corrosion resistance. In the production process of ductile iron pipes, especially before galvanizing, surface grinding is a key step. Through grinding, burrs, scales, rust and other impurities on the surface of the cast pipe can be removed, the surface finish and roughness can be improved, and a good foundation can be provided for subsequent galvanizing.

[0003] At present, the devices on the market for grinding the surface of ductile iron pipe fittings mainly rely on the combination of a robotic arm and a grinding belt. As a key component of automated operation, the robotic arm can grasp, position and move the pipe fittings through precise control, while the grinding belt provides the necessary grinding force to remove impurities on the surface of the pipe fittings. However, although this device can realize grinding operations, it has certain limitations.

[0004] Specifically, in the existing grinding device, the robot arm can only grab one pipe at a time for grinding operation, which leads to relatively low working efficiency of the device. This limitation is particularly obvious in the case of mass production or the need to quickly process a large number of pipes. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the purpose of the utility model is to propose a ductile iron pipe surface treatment device. The device adopts a multi-station design and can simultaneously grind multiple groups of pipe bodies within one grinding time, which greatly improves work efficiency and ensures the uniformity and consistency of the grinding effect, and has a good use effect.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a ductile iron pipe surface treatment device, comprising a frame, multiple groups of grinding mechanisms, a two-way conveying mechanism, two groups of placement frames and multiple groups of mounting seats, wherein a treatment chamber is opened on the surface of the frame; the multiple groups of grinding mechanisms are respectively arranged on the inner wall of the treatment chamber; the two-way conveying mechanism is arranged on the inner wall of the treatment chamber and is located on the outside of the multiple groups of grinding mechanisms; the two groups of placement frames are respectively arranged on the surface of the two-way conveying mechanism; the multiple groups of mounting seats are respectively arranged on the surfaces of the two groups of placement frames, and correspond to the positions of the multiple groups of grinding mechanisms.

[0008] The utility model discloses a ductile iron pipe surface treatment device, which adopts a multi-station design and can simultaneously grind multiple groups of pipe bodies within one grinding time, thereby greatly improving the work efficiency, ensuring the uniformity and consistency of the grinding effect, and having a good use effect.

[0009] In addition, the ductile iron pipe surface treatment device proposed in the application may also have the following additional technical features:

[0010] Specifically, the grinding mechanism includes a seat body, a mounting frame, an outer roller, an inner roller, a grinding belt and a first driving motor, wherein the seat body is fixedly connected to the inner wall of the processing chamber, the mounting frame is fixedly connected to an end surface of the seat body away from the inner wall of the processing chamber, the outer roller is rotatably connected to the inner wall of the mounting frame, the inner roller is rotatably connected to the inner wall of the seat body, and the grinding belt is connected between the outer roller and the first driving motor, and the first driving motor is fixedly connected to the bottom of the seat body and connected to one end of the central axis of the inner roller; the bidirectional conveying mechanism includes a base, two groups of bidirectional screw rods, a first side gear, a first middle gear, a first synchronous toothed belt and a second driving motor, wherein the base is symmetrically fixedly connected to the inner wall of the processing chamber and is located outside the seat body, the two groups of bidirectional screw rods are rotatably connected to the two groups of inner walls of the base respectively, the two ends of the two groups of bidirectional screw rods are rotatably connected to the inner wall of the processing chamber respectively, one end of the two groups of bidirectional screw rods respectively passes through the outside of the frame and is fixedly connected to the first side gear, the first middle gear is rotatably connected to the surface of the frame and is located inside the first side gear , the first middle gear and the two groups of the first side gears are connected through the first synchronous toothed belt, the second driving motor is fixedly connected to the surface of the frame and is located outside the first middle gear, the output end of the second driving motor is fixedly connected to one end of the central axis of the first middle gear, and the outer diameter of the first middle gear is larger than the outer diameters of the two groups of the first side gears; the two groups of placement frames are respectively threadedly connected to the outer surfaces of the two groups of the two-way screw rods and slidably connected to the inner wall of the processing chamber, and the two groups of the placement frames move synchronously inward or outward along the outer surfaces of the two groups of the two-way screw rods and the inner wall of the processing chamber; the mounting seat includes a left inner shaft, a right sleeve, a sliding seat, a right inner shaft and an elastic block, wherein the left inner shaft and the right sleeve are respectively arranged on the surface of the placement frame and have corresponding positions, one end of the sliding seat is rotatably connected with the right inner shaft, the other end of the sliding seat penetrates into the interior of the right sleeve, and a spring is arranged between the sliding seat and the inner wall of the right sleeve, and the elastic block is respectively arranged on the surface of the left inner shaft and the surface of the right inner shaft, and the outer diameter of the left inner shaft and the outer diameter of the right inner shaft are both smaller than the inner diameter of the tube body.

[0011] Specifically, it also includes a displacement mechanism arranged on the surface of the placement frame, and the displacement mechanism includes a rectangular seat, an adjusting gear, a sliding frame, a cross bar and a toothed portion, wherein the rectangular seat is evenly and symmetrically arranged on the inner wall of the placement frame, the adjusting gear is rotatably connected to the surface of one end of the rectangular seat, the sliding frame is slidably connected to the outer surface of the other end of the rectangular seat, and is threadedly connected to the outer surface of one end of the adjusting gear, the left inner shaft and the right sleeve are respectively arranged on the surface of the sliding frame, the cross bar is fixedly connected to the inner wall of the processing chamber, and is located on one side of the bottom of the adjusting gear, the toothed portion is symmetrically arranged on the top of the cross bar, and the teeth on the toothed portion are meshed with the adjusting gear.

[0012] Specifically, the distance that the sliding frame can be driven to move on the surface of one end of the rectangular seat by the engagement of the teeth on the tooth portion with the adjusting gear is equal to the distance between the tube body and the grinding belt in the origin state.

[0013] Specifically, it also includes a synchronous rotation mechanism arranged on the surface of the placement frame, and the synchronous rotation mechanism includes a second side gear, a second middle gear, a second synchronous toothed belt and a third drive motor, wherein the left inner shaft is rotatably connected to the surface of the sliding frame, the second middle gear is rotatably connected to the middle group of sliding frame surfaces, and is fixedly connected to one end of the central axis of the left inner shaft in the middle group, the second side gear is rotatably connected to the sliding frame surfaces on both sides, and is fixedly connected to one end of the central axis of the left inner shaft on both sides, the outer diameter of the second middle gear is larger than the outer diameter of the second side gear, the second middle gear and the two groups of the second side gears are connected by the second synchronous toothed belt, the third drive motor is fixedly connected to the surface of the placement frame, and is located on the outside of the second middle gear, and the output end of the third drive motor is fixedly connected to one end of the central axis of the second middle gear.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of a ductile iron pipe surface treatment device of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a grinder in a ductile iron pipe surface treatment device of the utility model;

[0018] Figure 3This is a schematic diagram of the structure of a bidirectional conveying mechanism in a ductile pipe surface treatment device of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of a mounting seat in a ductile iron pipe surface treatment device of the utility model;

[0020] Figure 5 The utility model is a schematic diagram of the structure of a synchronous rotating mechanism in a ductile pipe surface treatment device.

[0021] As shown in the figure:

[0022] 1. Frame; 2. Grinding mechanism; 3. Two-way conveying mechanism; 4. Placement frame; 5. Mounting seat;

[0023] 11. Processing chamber;

[0024] 21. seat body; 22. mounting frame; 23. outer roller; 24. grinding belt; 25. first driving motor;

[0025] 31. base; 32. bidirectional screw rod; 33. first side gear; 34. first middle gear; 35. first synchronous toothed belt; 36. second drive motor;

[0026] 51. left inner shaft; 52. right sleeve; 53. slide seat; 54. right inner shaft; 55. elastic block;

[0027] 6. displacement mechanism; 61. rectangular seat; 62. adjusting gear; 63. sliding frame; 64. crossbar; 65. tooth portion;

[0028] 7. Synchronous rotating mechanism; 71. Second side gear; 72. Second middle gear; 73. Second synchronous toothed belt; 74. Third driving motor. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. On the contrary, the embodiments of the present invention include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0030] A ductile iron pipe surface treatment device according to an embodiment of the utility model is described below in conjunction with the accompanying drawings.

[0031] like Figure 1-Figure 5As shown, a ductile iron pipe surface treatment device according to an embodiment of the utility model comprises a frame 1, multiple groups of grinding mechanisms 2, a bidirectional conveying mechanism 3, two groups of placement frames 4 and multiple groups of mounting seats 5, wherein a treatment chamber 11 is opened on the surface of the frame 1; the multiple groups of grinding mechanisms 2 are respectively arranged on the inner wall of the treatment chamber 11; the bidirectional conveying mechanism 3 is arranged on the inner wall of the treatment chamber 11 and is located on the outside of the multiple groups of grinding mechanisms 2; the two groups of placement frames 4 are respectively arranged on the surface of the bidirectional conveying mechanism 3; the multiple groups of mounting seats 5 are respectively arranged on the surfaces of the two groups of placement frames 4 and correspond to the positions of the multiple groups of grinding mechanisms 2.

[0032] Specifically, when in use, multiple groups of pipe bodies to be polished are respectively installed on the mounting seats 5 on the two groups of placement frames 4. After the installation is completed, the two groups of placement frames 4 are driven to move synchronously outward by the two-way conveying mechanism 3. During the movement of the two groups of placement frames 4 outward, the multiple groups of pipe bodies to be polished on the mounting seats 5 are respectively in contact with one end of the multiple groups of polishing mechanisms 2. The surfaces of the multiple groups of pipe bodies to be polished are polished by the multiple groups of polishing mechanisms 2. The device adopts a multi-station design, which can polish multiple groups of pipe bodies synchronously within one polishing time, greatly improving the work efficiency, and ensuring the uniformity and consistency of the polishing effect, and the use effect is good.

[0033] In one embodiment of the present invention, Figure 1-Figure 5As shown, the grinding mechanism 2 includes a base 21, a mounting frame 22, an outer roller 23, an inner roller, a grinding belt 24 and a first drive motor 25, wherein the base 21 is fixedly connected to the inner wall of the processing chamber 11, the mounting frame 22 is fixedly connected to the end surface of the base 21 away from the inner wall of the processing chamber 11, the outer roller 23 is rotatably connected to the inner wall of the mounting frame 22, the inner roller is rotatably connected to the inner wall of the base 21, and the grinding belt 24 is connected between the outer roller 23, and the first drive motor 25 is fixedly connected to the bottom of the base 21 and connected to one end of the central axis of the inner roller; the bidirectional conveying mechanism 3 includes a base 3 1. Two sets of bidirectional screw rods 32, a first side gear 33, a first middle gear 34, a first synchronous toothed belt 35 and a second driving motor 36, wherein the base 31 is symmetrically fixedly connected to the inner wall of the processing chamber 11 and is located outside the base body 21, the two sets of bidirectional screw rods 32 are respectively rotatably connected to the inner walls of the two sets of bases 31, the two ends of the two sets of bidirectional screw rods 32 are respectively rotatably connected to the inner wall of the processing chamber 11, one end of the two sets of bidirectional screw rods 32 respectively passes through the outside of the frame 1 and is fixedly connected with the first side gear 33, the first middle gear 34 is rotatably connected to the surface of the frame 1 and is located at the first side gear On the inner side of the wheel 33, the first middle gear 34 is connected to the two sets of first side gears 33 through the first synchronous toothed belt 35, the second drive motor 36 is fixedly connected to the surface of the frame 1 and is located on the outer side of the first middle gear 34, the output end of the second drive motor 36 is fixedly connected to one end of the central axis of the first middle gear 34, and the outer diameter of the first middle gear 34 is larger than the outer diameter of the two sets of first side gears 33; the two sets of placement frames 4 are respectively threadedly connected to the outer surfaces of the two sets of bidirectional screw rods 32, and are slidably connected to the inner wall of the processing chamber 11, and the two sets of placement frames 4 are along the outer surfaces of the two sets of bidirectional screw rods 32 and the processing chamber 1 1 The inner wall of the tube 4 moves synchronously inward or outward; the mounting seat 5 comprises a left inner shaft 51, a right sleeve 52, a slide 53, a right inner shaft 54 ​​and an elastic block 55, wherein the left inner shaft 51 and the right sleeve 52 are respectively arranged on the surface of the placing frame 4, and the positions are corresponding, one end of the slide 53 is rotatably connected with the right inner shaft 54, the other end of the slide 53 penetrates into the inside of the right sleeve 52, and a spring is arranged between the slide 53 and the inner wall of the right sleeve 52, and the elastic block 55 is respectively arranged on the surface of the left inner shaft 51 and the surface of the right inner shaft 54, and the outer diameter of the left inner shaft 51 and the outer diameter of the right inner shaft 54 ​​are both smaller than the inner diameter of the tube body.

[0034] It should be noted that the operating parameters of the multiple groups of grinding mechanisms 2 described in this embodiment are consistent.

[0035] Specifically, the first drive motor 25 drives the inner roller to rotate synchronously, and the rotation of the inner roller drives the outer roller 23 to rotate synchronously through the grinding belt 24. During the rotation of the outer roller 23 and the inner roller, the grinding belt 24 moves synchronously and grinds the surface of the tube body. The second drive motor 36 drives the first middle gear 34 to rotate synchronously. The rotation of the first middle gear 34 drives the first side gear 33 to rotate synchronously through the first synchronous toothed belt 35. The rotation of the first side gear 33 drives the bidirectional screw rod 32 to rotate synchronously. The rotation of the bidirectional screw rod 32 drives the two sets of placement frames 4 to move synchronously inward or outward along the outer surface of the bidirectional screw rod 32 and the inner wall of the processing chamber 11. During the outward movement of the placement frame 4, the tube body is synchronously driven to be polished. The grinding belt 24 moves in the direction in which the placement frame 4 moves outward, and the tube body is synchronously driven to move in the direction away from the grinding belt 24. The steps of installing the tube body are as follows: first, press the elastic block 55 on the surface of the left inner shaft 51, and then put one end of the tube body on the outside of the left inner shaft 51. The elastic block 55 on the surface of the left inner shaft 51 pops out and abuts against the inner wall of one end of the tube body after losing its force, so that one end of the tube body is fixed. Then, the slide seat 53 is pushed toward the side of the right sleeve 52. After the slide seat 53 moves, the elastic block 55 on the surface of the right inner shaft 54 ​​is pressed again, and then the other end of the tube body is put on the outside of the right inner shaft 54. The elastic block 55 on the surface of the right inner shaft 54 ​​pops out and abuts against the inner wall of the other end of the tube body after losing its force, so that the other end of the tube body is fixed.

[0036] In one embodiment of the present invention, Figure 4-Figure 5 As shown, it also includes a displacement mechanism 6 arranged on the surface of the placement frame 4, and the displacement mechanism 6 includes a rectangular seat 61, an adjusting gear 62, a sliding frame 63, a cross bar 64 and a tooth portion 65, wherein the rectangular seat 61 is evenly and symmetrically arranged on the inner wall of the placement frame 4, the adjusting gear 62 is rotatably connected to the surface of one end of the rectangular seat 61, the sliding frame 63 is slidably connected to the outer surface of the other end of the rectangular seat 61, and is threadedly connected to the outer surface of one end of the adjusting gear 62, the left inner shaft 51 and the right sleeve 52 are respectively arranged on the surface of the sliding frame 63, the cross bar 64 is fixedly connected to the inner wall of the processing chamber 11, and is located on one side of the bottom of the adjusting gear 62, and the tooth portion 65 is symmetrically arranged on the top of the cross bar 64, and the teeth on the tooth portion 65 are meshed and connected with the adjusting gear 62.

[0037] It should be noted that the displacement mechanism 6 is provided so that the tube body directly contacts the grinding belt 24 after being moved to the set position, thereby effectively preventing structural conflict and achieving good use effect.

[0038] Specifically, during the process of the placement frame 4 moving outward, the adjusting gear 62 contacts and meshes with the teeth on the surface of the tooth portion 65, and synchronously drives the adjusting gear 62 to rotate. The rotation of the adjusting gear 62 synchronously drives the sliding frame 63 to move in a direction away from the rectangular seat 61. The movement of the sliding frame 63 synchronously drives the left inner shaft 51, the right inner shaft 54 ​​and the tube body to move in a direction toward the side of the grinding belt 24 until they contact the surface of the grinding belt 24. When the tube body contacts the surface of the grinding belt 24, the adjusting gear 62 is synchronously separated from the teeth on the surface of the tooth portion 65. During the movement of the placement frame 4 toward the inside, the adjusting gear 62 contacts and meshes with the teeth on the surface of the tooth portion 65, and synchronously drives the adjusting gear 62 to rotate. The rotation of the adjusting gear 62 synchronously drives the sliding frame 63 to move toward the side close to the rectangular seat 61. The movement of the sliding frame 63 synchronously drives the left inner shaft 51, the right inner shaft 54 ​​and the tube body to move toward the side away from the grinding belt 24 until they are separated from the surface of the grinding belt 24. When the tube body is separated from the surface of the grinding belt 24, the adjusting gear 62 is synchronously separated from the teeth on the surface of the tooth portion 65.

[0039] In one embodiment of the present invention, Figure 5 As shown, the distance that the sliding frame 63 can move on the surface of one end of the rectangular seat 61 by the engagement of the teeth on the tooth portion 65 with the adjusting gear 62 is equal to the distance between the tube body and the grinding belt 24 in the origin state.

[0040] Specifically, the moving distance of the slide frame 63 is further limited to ensure that the distance between the tube body and the grinding belt 24 is fixed, and the use effect is good.

[0041] In one embodiment of the present invention, Figure 5 As shown, it also includes a synchronous rotation mechanism 7 arranged on the surface of the placement frame 4, and the synchronous rotation mechanism 7 includes a second side gear 71, a second middle gear 72, a second synchronous toothed belt 73 and a third drive motor 74, wherein the left inner shaft 51 is rotatably connected to the surface of the sliding frame 63, the second middle gear 72 is rotatably connected to the surface of the middle group of sliding frames 63, and is fixedly connected to one end of the central axis of the middle group of left inner shafts 51, the second side gear 71 is rotatably connected to the surfaces of the sliding frames 63 on both sides, and is fixedly connected to one end of the central axis of the left inner shaft 51 on both sides, the outer diameter of the second middle gear 72 is larger than the outer diameter of the second side gear 71, the second middle gear 72 is connected to the two groups of second side gears 71 through the second synchronous toothed belt 73, the third drive motor 74 is fixedly connected to the surface of the placement frame 4, and is located on the outside of the second middle gear 72, and the output end of the third drive motor 74 is fixedly connected to one end of the central axis of the second middle gear 72.

[0042] It should be noted that the synchronous rotation mechanism 7 described in this embodiment is used to synchronously drive multiple groups of tube bodies to flip, and by driving the tube bodies to flip and thus switch the grinding area, the work efficiency is effectively improved and the use effect is good.

[0043] Specifically, the third drive motor 74 synchronously drives the second middle gear 72 to rotate, and the second middle gear 72 rotates through the second synchronous toothed belt 73 to synchronously drive the second side gear 71 to rotate, and the second middle gear 72 and the second side gear 71 rotate synchronously to drive multiple groups of left inner shafts 51 to rotate, and the left inner shaft 51 rotates through the elastic block 55 to synchronously drive the tube body and the right inner shaft 54 ​​to rotate, thereby realizing the switching of the tube body grinding area, and the use effect is good.

[0044] To sum up, the device for surface treatment of ductile iron pipes in the embodiment of the utility model adopts a multi-station design, which can simultaneously grind multiple groups of pipe bodies within one grinding time, greatly improving work efficiency, ensuring the uniformity and consistency of the grinding effect, and having a good use effect.

[0045] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A ductile iron pipe surface treatment device, characterized in that: It comprises a frame (1), multiple groups of grinding mechanisms (2), a bidirectional conveying mechanism (3), two groups of placement frames (4) and multiple groups of mounting seats (5), wherein: A processing chamber (11) is provided on the surface of the frame (1); A plurality of groups of the grinding mechanisms (2) are respectively arranged on the inner wall of the processing chamber (11); The bidirectional conveying mechanism (3) is arranged on the inner wall of the processing chamber (11) and is located outside the plurality of groups of polishing mechanisms (2); The two groups of placement frames (4) are respectively arranged on the surface of the bidirectional conveying mechanism (3); The plurality of groups of mounting seats (5) are respectively arranged on the surfaces of the two groups of placement frames (4) and correspond to the positions of the plurality of groups of grinding mechanisms (2).

2. The ductile iron pipe surface treatment device according to claim 1, characterized in that: The grinding mechanism (2) comprises a base (21), a mounting frame (22), an outer roller (23), an inner roller, a grinding belt (24) and a first driving motor (25), wherein: The seat body (21) is fixedly connected to the inner wall of the processing chamber (11); the mounting frame (22) is fixedly connected to an end surface of the seat body (21) away from the inner wall of the processing chamber (11); the outer roller (23) is rotatably connected to the inner wall of the mounting frame (22); the inner roller is rotatably connected to the inner wall of the seat body (21); the grinding belt (24) is connected between the inner roller and the outer roller (23); and the first driving motor (25) is fixedly connected to the bottom of the seat body (21) and connected to one end of the central axis of the inner roller; The bidirectional conveying mechanism (3) comprises a base (31), two sets of bidirectional screw rods (32), a first side gear (33), a first middle gear (34), a first synchronous toothed belt (35) and a second driving motor (36), wherein: The base (31) is symmetrically fixedly connected to the inner wall of the processing chamber (11) and is located outside the base body (21); the two groups of bidirectional screw rods (32) are respectively rotatably connected to the inner walls of the two groups of bases (31); the two ends of the two groups of bidirectional screw rods (32) are respectively rotatably connected to the inner wall of the processing chamber (11); one end of the two groups of bidirectional screw rods (32) respectively passes through the outside of the frame (1) and is fixedly connected to the first side gear (33); the first middle gear (34) is rotatably connected to the frame (1). The first middle gear (34) is connected to the surface of the frame (1) and is located on the inner side of the first side gear (33); the first middle gear (34) and the two groups of the first side gears (33) are connected via the first synchronous toothed belt (35); the second drive motor (36) is fixedly connected to the surface of the frame (1) and is located on the outer side of the first middle gear (34); the output end of the second drive motor (36) is fixedly connected to one end of the central axis of the first middle gear (34); the outer diameter of the first middle gear (34) is larger than the outer diameter of the two groups of the first side gears (33); The two groups of placement frames (4) are respectively threadedly connected to the outer surfaces of the two groups of bidirectional screw rods (32) and slidably connected to the inner wall of the processing chamber (11); the two groups of placement frames (4) move synchronously inward or outward along the outer surfaces of the two groups of bidirectional screw rods (32) and the inner wall of the processing chamber (11); The mounting seat (5) comprises a left inner shaft (51), a right sleeve (52), a sliding seat (53), a right inner shaft (54) and an elastic clamping block (55), wherein: The left inner shaft (51) and the right sleeve (52) are respectively arranged on the surface of the placement frame (4) and are positioned correspondingly. One end of the slide seat (53) is rotatably connected to the right inner shaft (54). The other end of the slide seat (53) penetrates into the interior of the right sleeve (52) and a spring is arranged between the slide seat and the inner wall of the right sleeve (52). The elastic block (55) is respectively arranged on the surface of the left inner shaft (51) and the surface of the right inner shaft (54). The outer diameter of the left inner shaft (51) and the outer diameter of the right inner shaft (54) are both smaller than the inner diameter of the tube body.

3. The ductile iron pipe surface treatment device according to claim 2, characterized in that: It also includes a displacement mechanism (6) arranged on the surface of the placement frame (4), the displacement mechanism (6) including a rectangular seat (61), an adjustment gear (62), a sliding frame (63), a crossbar (64) and a toothed portion (65), wherein: The rectangular seat (61) is evenly and symmetrically arranged on the inner wall of the placement frame (4); the adjusting gear (62) is rotatably connected to the surface of one end of the rectangular seat (61); the sliding frame (63) is slidably connected to the outer surface of the other end of the rectangular seat (61) and is threadedly connected to the outer surface of one end of the adjusting gear (62); the left inner shaft (51) and the right sleeve (52) are respectively arranged on the surface of the sliding frame (63); the cross bar (64) is fixedly connected to the inner wall of the processing chamber (11) and is located on one side of the bottom of the adjusting gear (62); the tooth portion (65) is symmetrically arranged on the top of the cross bar (64); the teeth on the tooth portion (65) are meshed and connected with the adjusting gear (62).

4. The ductile iron pipe surface treatment device according to claim 3, characterized in that: The distance that the teeth on the tooth portion (65) mesh with the adjusting gear (62) can drive the sliding frame (63) to move on the surface of one end of the rectangular seat (61) is equal to the distance between the tube body and the grinding belt (24) in the origin state.

5. The ductile iron pipe surface treatment device according to claim 3, characterized in that: It also includes a synchronous rotation mechanism (7) arranged on the surface of the placement frame (4), the synchronous rotation mechanism (7) including a second side gear (71), a second middle gear (72), a second synchronous toothed belt (73) and a third drive motor (74), wherein: The left inner shaft (51) is rotatably connected to the surface of the slide frame (63); the second middle gear (72) is rotatably connected to the surface of the middle group of slide frames (63) and is fixedly connected to one end of the central axis of the middle group of left inner shafts (51); the second side gear (71) is rotatably connected to the surfaces of the slide frames (63) on both sides and is fixedly connected to one end of the central axis of the left inner shaft (51) on both sides; the outer diameter of the second middle gear (72) is larger than the outer diameter of the second side gear (71); the second middle gear (72) and the two groups of the second side gears (71) are connected via the second synchronous toothed belt (73); the third drive motor (74) is fixedly connected to the surface of the placement frame (4) and is located outside the second middle gear (72); the output end of the third drive motor (74) is fixedly connected to one end of the central axis of the second middle gear (72).

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