Roundness correction machine for nodular cast iron pipe body

Abstract

The utility model relates to the technical field of pipeline shaping equipment, and discloses a spheroidal graphite cast iron pipe body roundness correcting machine which comprises a machine body, a lower die holder is fixedly connected to the machine body, a plurality of stand columns are symmetrically and fixedly connected to the positions, located on the two sides of the lower die holder, of the machine body, and a main control box is fixedly connected to one side of one stand column. An upper beam is fixedly connected between the multiple stand columns, a plurality of first hydraulic cylinders are fixedly connected to the upper beam, the output ends of the first hydraulic cylinders extend to the position below the upper beam and are fixedly connected with an upper die base, a plurality of supporting frames are fixedly connected to one side of the machine body, and a first machine frame is movably connected between every two adjacent supporting frames. By means of the double structure of extrusion of the lower die base and the upper die base and supporting of the inner roundness correction head, all-round uniform stress roundness correction is achieved in cooperation with pipeline rotation, repeated pressure application can be achieved after multiple times of rotation adjustment, the roundness correction device is matched with the high rigidity characteristic of a nodular cast iron pipe, accurate roundness correction can be conducted on the flaring end of the pipeline, and the problem that traditional static extrusion roundness correction is not thorough can be solved.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe shaping equipment, and in particular to a ductile iron pipe body rounding machine. Background Technology

[0002] Ductile iron pipes are made by adding a spheroidizing agent to molten iron to make the internal graphite spherical, and then through centrifugal casting, annealing and other processes. At present, ductile iron pipes are mainly formed by centrifugal casting. During the casting process, uneven distribution of molten iron and deviations in the mold itself will initially cause the pipe body to be irregular. In the subsequent cooling stage, the cooling rate of different parts of the pipe body is different, and the shrinkage of the inner and outer walls and the circumference is not synchronized, which can easily generate thermal stress and stretch and deform the round pipe.

[0003] Therefore, it is necessary to promptly round and reshape newly formed and out-of-round ductile iron pipes. A Chinese utility model patent with publication number CN222402896U describes a ductile iron pipe rounding device, comprising a base, an annular rounding mechanism mounted on the base and fitted around the ductile iron pipe, and a control mechanism that drives the annular rounding mechanism to radially round the ductile iron pipe. The annular rounding mechanism includes annular outer discs fixedly mounted on both sides of the base, a turntable concentrically positioned between the two annular outer discs and controlled to rotate by the control mechanism, and a rotating disc evenly spaced along the circumference of the annular outer discs. The circular rounding device consists of several rounding sliders arranged at intervals and slidably connected to two annular outer discs at both ends. It uses multiple sets of circumferential rounding rollers to synchronously compress the pipe, which is a static compression. It is difficult to adapt to the irregular out-of-round shape of the pipe at multiple points, resulting in uneven force distribution. It cannot round the flared end of the ball mill pipe, which will affect the sealing of the subsequent pipe connection, thus making the correction incomplete. Furthermore, the existing solution uses a hydraulic cylinder and a linkage mechanism to make the rounding rollers abut against the pipe. Due to the thick wall and high rigidity of the ductile iron pipe, the transmission characteristics of its structure are insufficient for the rounding pressure of the pipe. Utility Model Content

[0004] The purpose of this invention is to provide a ductile iron pipe rounding machine. Through the rounding structure of external pressure and internal top cooperation, the overall rounding of the pipe can be realized, and the pipe can be rotated and adjusted multiple times before being pressurized again for rounding. This improves the rounding accuracy and efficiency of ductile iron pipes and can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A ductile iron pipe rounding machine includes a machine body, a lower mold base fixedly connected to the machine body, and multiple columns symmetrically fixedly connected to both sides of the machine body on both sides of the lower mold base. A main control box is fixedly connected to one side of one of the columns. An upper beam is fixedly connected between the multiple columns, and multiple first hydraulic cylinders are fixedly connected to the upper beam. The output end of the first hydraulic cylinder extends to a position below the upper beam and is fixedly connected to an upper mold base. Multiple support frames are fixedly connected to one side of the machine body, and a first frame is movably connected between two adjacent support frames. A second hydraulic cylinder is fixedly connected to one side of the first frame. The first and second hydraulic cylinders are respectively connected to an external hydraulic station through hydraulic pipes. An inner rounding head is rotatably connected to the output end of the second hydraulic cylinder. A slide table is fixedly connected to the side of the machine body away from the support frames, and a second frame is slidably connected to the slide table. A first motor is fixedly connected to one side of the second frame, and an abutment rubber head is fixedly connected to the output end of the first motor. The first motor is electrically connected to the main control module in the main control box through a wire.

[0007] As a further preferred embodiment of this utility model, a fixed shaft is fixedly connected to both the front and rear sides of the upper mold base. Guide wheels are rotatably connected to both ends of the fixed shaft. The guide wheels are also rotatably connected to the corresponding columns. After the guide wheels are rotatably connected to the corresponding columns, they are used to improve the stability of the vertical movement of the upper mold base.

[0008] As a further preferred embodiment of this utility model, the two support frames are respectively fixedly connected to the opposite sides of the bearings, and a rotating shaft is rotatably connected between the two bearings. The first frame is rotatably connected to the rotating shaft to provide installation and rotation conditions for the first frame. A second motor is fixedly connected to one side of one of the support frames. The second motor is electrically connected to the main control module in the main control box through a wire, and the output end of the second motor is fixedly connected to one end of the rotating shaft. After the second motor drives the rotating shaft to rotate, it is used to realize the flipping function of the first frame, so that the first frame, the second hydraulic cylinder, and the inner calibration round head do not affect the picking and placing operation when picking up and placing pipes.

[0009] As a further preferred embodiment of this utility model, a support platform is fixedly connected to the machine body located between the two support frames. A plurality of third hydraulic cylinders are fixedly connected to the lower end of the support platform. The third hydraulic cylinders are connected to an external hydraulic station through hydraulic pipes and are used to limit the first frame and ensure the stability of the second hydraulic cylinder pushing the inner calibration head.

[0010] As a further preferred embodiment of this utility model, the slide table includes a base platform fixedly connected to one side of the machine body, a cylinder fixedly connected to the lower end of the base platform, two guide rails symmetrically fixedly connected to the base platform, and a slide track is provided on the base platform located between the two guide rails.

[0011] As a further preferred embodiment of this utility model, a plurality of sliders are fixedly connected to the lower end of the second frame. The sliders are slidably connected to the corresponding guide rails. An ear seat is fixedly connected to the second frame located between two of the sliders. The ear seat extends to the bottom of the base platform via a slide rail and is rotatably connected to the output end of the cylinder. The output end of the cylinder can push and pull the second frame horizontally on the base platform through the ear seat, causing the contact rubber head and the inner rounding head to rotate the pipe in the lower mold base and cooperate with the upper mold base to improve the quality of pipe rounding.

[0012] As a further preferred embodiment of this utility model, the contact rubber head is frustum-shaped.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, relying on the dual structure of extrusion by the lower and upper mold bases and the inner rounding head support, and in conjunction with the rotation of the pipe, uniform force is applied to the entire circumference for rounding. It can also be repeatedly rotated and adjusted before repeated pressure is applied, which is suitable for the high rigidity characteristics of ductile iron pipes. It can also accurately round the flared end of the pipe, thus solving the problem of incomplete rounding by traditional static extrusion. Attached Figure Description

[0015] Figure 1 This is a first side view of the main structure of this utility model;

[0016] Figure 2 This is a second side view of the main structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the assembly structure of the support frame and the first frame of this utility model;

[0018] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Machine body; 2. Lower mold base; 3. Column; 4. Upper beam; 5. First hydraulic cylinder; 6. Upper mold base; 7. Support frame; 8. First machine frame; 9. Second hydraulic cylinder; 10. Inner calibration round head; 11. Slide table; 12. Second machine frame; 13. First motor; 14. Contact rubber head; 15. Main control box; 16. Fixed shaft; 17. Guide wheel; 18. Shaft seat; 19. Rotating shaft; 20. Second motor; 21. Support platform; 22. Third hydraulic cylinder; 23. Limit plate; 24. Base platform; 25. Cylinder; 26. Guide rail; 27. Slide rail; 28. Slider; 29. ​​Ear seat. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-4 As shown, the present invention provides a ductile iron pipe rounding machine, comprising a machine body 1, a lower mold base 2 fixedly connected to the machine body 1, and multiple columns 3 symmetrically fixedly connected to both sides of the machine body 1 located on the lower mold base 2. A main control box 15 is fixedly connected to one side of one of the columns 3. An upper beam 4 is fixedly connected between the multiple columns 3. Multiple first hydraulic cylinders 5 are fixedly connected to the upper beam 4. The output end of the first hydraulic cylinder 5 extends to a position below the upper beam 4 and is fixedly connected to an upper mold base 6. Multiple support frames 7 are fixedly connected to one side of the machine body 1. Between two adjacent support frames 7 The machine body 1 is connected to a first frame 8. A second hydraulic cylinder 9 is fixedly connected to one side of the first frame 8. The first hydraulic cylinder 5 and the second hydraulic cylinder 9 are respectively connected to an external hydraulic station through hydraulic pipes. The output end of the second hydraulic cylinder 9 is rotatably connected to an inner calibration head 10. A slide table 11 is fixedly connected to the side of the machine body 1 away from the support frame 7. A second frame 12 is slidably connected to the slide table 11. A first motor 13 is fixedly connected to one side of the second frame 12. A contact rubber head 14 is fixedly connected to the output end of the first motor 13. The first motor 13 is electrically connected to the main control module in the main control box 15 through wires.

[0022] like Figure 1 , Figure 3 As shown, fixed shafts 16 are fixedly connected to both the front and rear sides of the upper mold base 6. Guide wheels 17 are rotatably connected to both ends of the fixed shafts 16. The guide wheels 17 are also rotatably connected to the corresponding columns 3. After the guide wheels 17 are rotatably connected to the corresponding columns 3, they are used to improve the stability of the vertical movement of the upper mold base 6. Shaft seats 18 are fixedly connected to opposite sides of the two support frames 7. A rotating shaft 19 is rotatably connected between the two shaft seats 18. The first frame 8 is rotatably connected to the rotating shaft 19 to provide installation and rotation conditions for the first frame 8. A second motor 20 is fixedly connected to one side of one of the support frames 7. The second motor 20 is connected to the main control box 15 through wires. The main control module inside is electrically connected, and the output end of the second motor 20 is fixedly connected to one end of the rotating shaft 19. After the second motor 20 drives the rotating shaft 19 to rotate, it is used to realize the flipping function of the first frame 8, so that when picking up and placing the pipe, the first frame 8, the second hydraulic cylinder 9, and the inner calibration round head 10 are not affected in their picking and placing operations. The body 1 located between the two support frames 7 is fixedly connected to the support platform 21. Multiple third hydraulic cylinders 22 are fixedly connected to the lower end of the support platform 21. The third hydraulic cylinders 22 are connected to the external hydraulic station through hydraulic pipes and are used to limit the first frame 8 to ensure the stability of the second hydraulic cylinder 9 pushing the inner calibration round head 10.

[0023] like Figure 1 , Figure 4As shown, the slide table 11 includes a base platform 24 fixedly connected to one side of the machine body 1. A cylinder 25 is fixedly connected to the lower end of the base platform 24. Two guide rails 26 are symmetrically fixedly connected to the base platform 24. A slide rail 27 is opened on the base platform 24 between the two guide rails 26. A plurality of sliders 28 are fixedly connected to the lower end of the second frame 12. The sliders 28 are slidably connected to the corresponding guide rails 26. An ear seat 29 is fixedly connected to the second frame 12 between the two sliders 28. The ear seat 29 extends to the lower part of the base platform 24 via the slide rail 27 and is rotatably connected to the output end of the cylinder 25. The output end of the cylinder 25 can push and pull the second frame 12 horizontally on the base platform 24 through the ear seat 29, causing the contact rubber head 14 and the inner rounding head 10 to rotate the pipe in the lower mold base 2 and cooperate with the upper mold base 6 to improve the quality of pipe rounding. The contact rubber head 14 is frustum-shaped.

[0024] It should be noted that this utility model is a ductile iron pipe rounding machine. Before rounding, a forklift is used in conjunction with an axle loading tool to smoothly lift the ductile iron pipe to be rounded to the top of the lower mold base 2. The pipe body is slowly lowered so that the pipe falls accurately into the preset bearing cavity of the lower mold base 2, ensuring that the pipe axis is parallel to the center line of the lower mold base 2. Then, the second motor 20 is started through the main control box 15, which drives the first frame 8 to rotate and reset to the working position. Then, the third hydraulic cylinder 22 is started. The output end of the third hydraulic cylinder 22 passes through the support platform 21 and is inserted into the limiting plate 23 fixedly connected inside the first frame 8, thereby achieving stable limiting of the first frame 8 and ensuring the stability of the subsequent inner rounding head 10 supporting action.

[0025] During the rounding process, the main control box 15 controls the external hydraulic station to start the main control box 15. The output end of the main control box 15 pushes the upper mold base 6 downward, so that the cavity at the lower end of the upper mold base 6 presses against the pipe. At this time, the output end of the second hydraulic cylinder 9 smoothly pushes the inner rounding head 10 to move horizontally, so that the inner rounding head 10 accurately extends into the port of one end of the ductile iron pipe, realizing the internal support of the flared part of the pipe. Simultaneously, the first hydraulic cylinder 5 continues to push the upper mold base 6 downward to apply pressure to the pipe. After the first rounding is completed, the first hydraulic cylinder 5 moves the upper mold base 6 upward and separates it from the pipe. Then, the control cylinder 25 is activated. The output end of the cylinder 25 pushes the second frame 12 to slide smoothly horizontally along the guide rail 26 through the ear seat 29. The second frame 12 synchronously drives the first motor 1 3. The contact rubber head 14 moves towards the pipeline until it is in close contact with the outside of the other end of the pipeline, cooperating with the inner rounding head 10 to clamp and fix both ends of the pipeline. At this time, the first motor 13 is started through the main control box 15. The first motor 13 drives the contact rubber head 14 to rotate. The contact rubber head 14, in conjunction with the inner rounding head 10, drives the ductile iron pipe to rotate slowly and uniformly in the lower mold base 2 for orientation adjustment. After orientation adjustment is completed, the first hydraulic cylinder 5 is started again. The first hydraulic cylinder 5 pushes the upper mold base 6 to move vertically downward along the column 3. Under the guidance of the guide wheel 17, the upper mold base 6 presses down smoothly, cooperating with the lower mold base 2 to apply pressure to the pipeline again for rounding, thereby achieving uniform pressure and rounding of the entire circumference of the pipeline to ensure the rounding effect.

[0026] After the rounding is completed, the main control box 15 controls the first hydraulic cylinder 5 to drive the upper mold base 6 to vertically return to the initial position. Then, the control cylinder 25 drives the second frame 12 and the contact rubber head 14 to horizontally return to the initial position. The control cylinder 9 drives the inner rounding head 10 to horizontally return to the initial position, releasing the clamp on the pipe. Then, the third hydraulic cylinder 22 is started, so that the output end of the third hydraulic cylinder 22 disengages from the limit plate 23. Then, the second motor 20 drives the first frame 8 to rotate to the non-working position. Finally, the forklift is used in conjunction with the axle loading tool to smoothly lift the rounded pipe to the designated storage location.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A duct straightening machine for ducts of spheroidal graphite cast iron, characterized in that: The machine includes a body (1), on which a lower mold base (2) is fixedly connected. On both sides of the lower mold base (2), multiple columns (3) are symmetrically fixedly connected. A main control box (15) is fixedly connected to one side of one of the columns (3). An upper beam (4) is fixedly connected between the multiple columns (3). Multiple first hydraulic cylinders (5) are fixedly connected to the upper beam (4). The output end of the first hydraulic cylinder (5) extends to the position below the upper beam (4) and is fixedly connected to an upper mold base (6). Multiple support frames (7) are fixedly connected to one side of the machine body (1). A first frame (8) is movably connected between two adjacent support frames (7). A second hydraulic cylinder (9) is fixedly connected to one side of the first frame (8). The first hydraulic cylinder (5) and the second hydraulic cylinder (9) are respectively connected to an external hydraulic station through hydraulic pipes. The output end of the second hydraulic cylinder (9) is rotatably connected to an inner calibration round head (10). A slide table (11) is fixedly connected to the side of the machine body (1) away from the support frame (7). A second frame (12) is slidably connected to the slide table (11). A first motor (13) is fixedly connected to one side of the second frame (12). A contact rubber head (14) is fixedly connected to the output end of the first motor (13). The first motor (13) is electrically connected to the main control module in the main control box (15) through a wire.

2. The duct straightening machine for nodular cast iron pipes according to claim 1, characterized in that: The upper mold base (6) is fixedly connected to a fixed shaft (16) on both the front and rear sides. Both ends of the fixed shaft (16) are connected to guide wheels (17), and the guide wheels (17) are also rolled on the corresponding column (3).

3. The ductile iron pipe rounding machine according to claim 1, characterized in that: Two support frames (7) are respectively fixedly connected to bearing seats (18) on opposite sides. A rotating shaft (19) is rotatably connected between the two bearing seats (18). The first frame (8) is rotatably connected to the rotating shaft (19). A second motor (20) is fixedly connected to one side of one of the support frames (7). The second motor (20) is electrically connected to the main control module in the main control box (15) through a wire. The output end of the second motor (20) is fixedly connected to one end of the rotating shaft (19).

4. The ductile iron pipe rounding machine according to claim 1, characterized in that: The body (1) located between the two support frames (7) is fixedly connected to a support platform (21), and a plurality of third hydraulic cylinders (22) are fixedly connected to the lower end of the support platform (21). The third hydraulic cylinders (22) are connected to an external hydraulic station through hydraulic pipes.

5. The ductile iron pipe rounding machine according to claim 1, characterized in that: The slide (11) includes a base platform (24) fixedly connected to one side of the body (1). A cylinder (25) is fixedly connected to the lower end of the base platform (24). Two guide rails (26) are symmetrically fixedly connected on the base platform (24). A slide (27) is provided on the base platform (24) between the two guide rails (26).

6. The ductile iron pipe rounding machine according to claim 5, characterized in that: The lower end of the second frame (12) is fixedly connected to a plurality of sliders (28), which are slidably connected to the corresponding guide rails (26). The second frame (12) located between two sliders (28) is fixedly connected to an ear seat (29), which extends through a slide rail (27) to the base platform (24) and is rotatably connected to the output end of the cylinder (25).

7. A ductile iron pipe rounding machine according to claim 6, characterized in that: The contact head (14) is frustum-shaped.

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