Cutting device for double-layer structure wall steel pipe

Abstract

The invention discloses a cutting device for a double-layer structure wall steel pipe, which comprises a linear guide rail parallel to the axial lead of a steel pipe body; the arc-shaped sliding rail is arranged on the linear guide rail through a transmission supporting piece and can slide on the linear guide rail in the axial direction of the pipe body, and the plane formed by the arc-shaped sliding rail is perpendicular to the axis of the pipe body; the periphery of the rigid outer ring is arranged on the arc-shaped sliding rail and can slide and rotate on the arc-shaped sliding rail in the circumferential direction, a tensioning device is arranged on the inner periphery of the rigid outer ring, the rigid outer ring is arranged on the periphery of the steel pipe in a sleeving mode and is separated from or fastened to the outer pipe wall through the tensioning device, and cutting equipment is arranged on the rigid outer ring; the rigid inner ring is arranged in the steel pipe, the plane of the rigid inner ring is perpendicular to the axis of the pipe body, the periphery of the rigid inner ring is provided with rollers, the rigid inner ring is in rolling contact with the inner pipe wall through the rollers, the rigid inner ring is connected with the arc-shaped sliding rail or the transmission supporting piece through a rigid connecting rod, and the cutting equipment is also arranged on the rigid inner ring; according to the invention, automatic cutting of complex pipe walls with interlayers can be realized, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of processing double-walled steel pipes, and in particular to a cutting device for double-walled steel pipes. Background Technology

[0002] The applicant has previously disclosed a double-walled steel pipe, which is a continuously automated spiral welded steel pipe composed of an inner pipe wall, an outer pipe wall, and a vertical spiral reinforcing ring between the inner and outer pipe walls. Its production and processing are as follows: Figure 1 As shown. A cross-sectional view of its pipe wall is shown below. Figure 2 As shown, due to the double-layered pipe wall structure and the presence of a spiral reinforcing ring within the interlayer formed between the two pipe walls, ordinary pipe cutting methods cannot cut the pipe smoothly. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a cutting device for double-walled steel pipes.

[0004] Technical solution: The present invention discloses a cutting device for a double-walled steel pipe, wherein the double-walled steel pipe includes an inner wall, an outer wall, and a spiral reinforcing rib between the inner and outer walls; The cutting device includes: A linear guide rail, wherein the linear guide rail is arranged parallel to the centerline of the steel pipe body; An arc-shaped slide rail is mounted on a linear guide rail via a transmission support member, and can slide along the axial direction of the tube body on it. The plane formed by the arc-shaped slide rail is perpendicular to the centerline of the tube body. A rigid outer ring is provided, the outer circumference of which is placed on an arc-shaped slide rail and can slide and rotate circumferentially thereon. The inner circumference of the rigid outer ring is provided with a tensioning device and is sleeved on the outer circumference of the steel pipe. The tensioning device is used to separate / tighten the outer pipe wall. A cutting device is provided on the rigid outer ring. A rigid inner ring is placed inside the steel pipe, with its plane perpendicular to the pipe's axis. Rollers are provided on the outer periphery of the rigid inner ring, and the inner ring rolls in contact with the inner pipe wall through the rollers. The rigid inner ring is connected to an arc-shaped slide rail or a transmission support through a rigid connecting rod. Cutting equipment is also provided on the rigid inner ring.

[0005] Furthermore, the transmission support is a bracket structure, the arc-shaped slide rail is placed on the transmission support, and the linear guide rail is provided with a groove directly below the center line of the steel pipe, and the transmission support is located in the groove.

[0006] Furthermore, the arc-shaped slide rail is co-centered with the rigid outer ring, and the two sides of the axial side protrude to form a circumferential U-shaped slide groove, and the outer periphery of the rigid outer ring is placed in the U-shaped slide groove.

[0007] Furthermore, the tensioning device is a tensioning airbag ring.

[0008] Furthermore, the rigid connecting rod extends from the arc-shaped slide rail or transmission support to the outer end of the steel pipe, and then extends from the outer end of the steel pipe back into the steel pipe to the rigid inner ring, so as to realize the axial synchronous movement of the rigid inner ring and the rigid outer ring.

[0009] Furthermore, the cutting device on the rigid outer ring and the cutting device on the rigid inner ring operate on the same plane.

[0010] Furthermore, the cutting equipment includes a first cutting device and a second cutting device. The first cutting device is a thermal cutting device for cutting the inner and outer pipe walls, and the second cutting device is a blade-type cutting device for cutting reinforcing ribs.

[0011] Furthermore, the first cutting device uses laser cutting, plasma cutting, or flame cutting; the second cutting device uses a circular saw.

[0012] Furthermore, the cutting device on the rigid outer ring has the same structure as the cutting device on the rigid inner ring; Both the rigid outer ring and the rigid inner ring are provided with circumferential guide rails. The first cutting device is placed on the circumferential guide rails, and the circumferential movement of the first cutting device on the circumferential guide rails is realized by the circumferential transmission assembly. The second cutting device is positioned on the rigid outer ring and rigid inner ring via a radial transmission assembly corresponding to the position of the reinforcing rib, thereby enabling the second cutting device to radially advance / retract on the surface of the steel pipe.

[0013] Furthermore, multiple first and second cutting devices are provided. The number of reinforcing ribs in the same cutting plane of the steel pipe is set by the second cutting device. One first cutting device is provided between any two adjacent second cutting devices.

[0014] Beneficial effects: Compared with the prior art, the advantages of the present invention are: 1. It can achieve automated cutting of complex pipes with sandwiched walls, with high efficiency; 2. It can ensure that the cut ends of the inner and outer pipe walls and the spiral reinforcing ring are in the same plane; 3. It can ensure the perpendicularity of the steel pipe axis at the cut end of the steel pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a double-walled steel pipe structure in the background art; Figure 2 This is a radial cross-sectional view of a double-walled steel pipe in the background art; Figure 3 This is a side sectional view of the present invention; Figure 4 This is a schematic diagram of the axial structure of the steel pipe and rigid outer ring of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 3 The cutting device for the double-walled steel pipe includes an inner wall 1, an outer wall 2, and a spiral reinforcing rib 3 between the inner and outer wall layers.

[0018] The cutting device includes: a linear guide rail 4, an arc-shaped slide rail 5, a rigid outer ring 6, and a rigid inner ring 8.

[0019] The linear guide rail 4 is set parallel to the axis of the steel pipe body, and the double-layer structured steel pipe will be continuously rolled into shape along the extension direction of the linear guide rail 4.

[0020] The arc-shaped slide rail 5 is mounted on the linear guide rail 4 via the transmission support member 11, and can slide along the axial direction of the tube body on it. The plane formed by the arc-shaped slide rail 5 is perpendicular to the center line of the tube body. The transmission support member 11 is a bracket structure, and the arc-shaped slide rail 5 is placed on the transmission support member 11. The linear guide rail 4 is provided with a groove directly below the center line of the steel tube, and the transmission support member 11 is located in the groove and can slide freely in the groove.

[0021] The outer periphery of the rigid outer ring 6 is placed on the arc-shaped slide rail 5. The arc-shaped slide rail 5 is set with the rigid outer ring 6 at the same center, and the two sides of the arc-shaped slide rail 5 are raised to form a circumferential U-shaped slide groove. The outer periphery of the rigid outer ring 6 is placed in the U-shaped slide groove, and the arc-shaped slide rail 5 can slide and rotate circumferentially on the rigid outer ring 6.

[0022] The rigid outer ring 6 is provided with a tensioning device 7 on its inner circumference. The tensioning device 7 is an expandable and retractable tensioning airbag ring, which is sleeved on the outer circumference of the steel pipe. The expansion / contraction action of the tensioning device 7 realizes the separation / tightening of the rigid outer ring 6 and the outer pipe wall 2. When the rigid outer ring 6 is separated from the outer pipe wall 2, the steel pipe drives and rotates independently. When the rigid outer ring 6 is tightened to the outer pipe wall 2, the steel pipe is relatively stationary with respect to the rigid outer ring 6, and they drive axially and rotate circumferentially together.

[0023] The rigid inner ring 8 is placed inside the steel pipe, with its plane perpendicular to the pipe's axis. Rollers 9 are provided on the outer periphery of the rigid inner ring 8, and the inner ring 8 rolls in contact with the inner pipe wall 1 via these rollers. The rigid inner ring 8 is connected to an arc-shaped slide rail 5 or a transmission support 11 via a rigid connecting rod 10. The rigid connecting rod 10 extends from the arc-shaped slide rail 5 or the transmission support 11 to the outer end of the steel pipe, then folds back into the steel pipe and extends to the rigid inner ring 8, achieving axial synchronous movement between the rigid inner ring 8 and the rigid outer ring 6. When the rigid outer ring 6 is fastened to the outer pipe wall 2, the rigid inner ring 8 moves axially along with the inner pipe wall 1, and simultaneously undergoes circumferential displacement under the action of the rollers 9.

[0024] Both the rigid outer ring 6 and the rigid inner ring 8 are equipped with cutting devices, and the cutting devices have the same structure; and they act on the same radial plane of the steel pipe.

[0025] The cutting equipment includes a first cutting device 12 and a second cutting device 13. The first cutting device 12 is a thermal cutting device for cutting the inner and outer pipe walls, which uses laser cutting, plasma cutting, or flame cutting. The second cutting device 13 is a blade-type cutting device for cutting the reinforcing ribs 3, such as a circular saw.

[0026] Both the rigid outer ring 6 and the rigid inner ring 8 are provided with circumferential guide rails 14. The first cutting device 12 is placed on the circumferential guide rails 14, and the circumferential movement of the first cutting device 12 on the circumferential guide rails 14 is realized by the circumferential transmission assembly. The second cutting device 13 is positioned on the rigid outer ring 6 and the rigid inner ring 8 via a radial transmission assembly corresponding to the position of the reinforcing rib 3, thereby enabling the second cutting device 13 to radially advance / retract on the surface of the steel pipe.

[0027] like Figure 4 The first cutting device 12 and the second cutting device 13 are both provided in multiples. The number of reinforcing ribs 3 in the same cutting plane of the steel pipe is set by the second cutting device 13, and three are used in this embodiment. One of the first cutting devices 12 is set between any two adjacent second cutting devices 13. It should be noted that the first cutting device 12 and the second cutting device 13 have a sequential working process. After one type of cutting device completes its work and returns to its initial state, the other type of cutting device will start cutting.

[0028] In actual work: Once the steel pipe has been formed to the required length, the tensioning device 7 on the rigid outer ring 6 is activated. The rigid outer ring 6 is fixed relative to the pipe body, causing the pipe body to rotate along with the rigid outer ring 6. Simultaneously, as the pipe body moves axially forward, the rigid inner ring 8 moves synchronously through the rigid connecting rod 10. The first cutting device 12 is activated to cut the inner and outer pipe walls, and moves circumferentially along the circumferential guide rail 14 on the rigid inner and outer rings to complete the cutting of the inner and outer walls. At the same time, the second cutting device 13 cuts at the position of the reinforcing rib 3.

Claims

1. A cutting device for a double-walled steel pipe, characterized in that: The double-walled steel pipe includes an inner pipe wall (1), an outer pipe wall (2), and a spiral reinforcing rib (3) between the inner and outer pipe walls. The cutting device includes: Linear guide (4), the linear guide (4) is set parallel to the center line of the steel pipe body; Arc-shaped slide rail (5), the arc-shaped slide rail (5) is mounted on the linear guide rail (4) through the transmission support member (11), and can slide along the tube axis on it. The plane formed by the arc-shaped slide rail (5) is perpendicular to the tube axis. A rigid outer ring (6) is placed on an arc-shaped slide rail (5) and can slide and rotate around it. A tensioning device (7) is provided on the inner circumference of the rigid outer ring (6) and is sleeved on the outer circumference of the steel pipe. The tensioning device (7) is used to separate / tighten the outer pipe wall (2). A cutting device is provided on the rigid outer ring (6). A rigid inner ring (8) is placed inside the steel pipe, and its plane is perpendicular to the axis of the pipe body. Rollers (9) are provided on the outer periphery of the rigid inner ring (8), and the rollers (9) make rolling contact with the inner pipe wall (1). The rigid inner ring (8) is connected to the arc-shaped slide rail (5) or the transmission support (11) through the rigid connecting rod (10). Cutting equipment is also provided on the rigid inner ring (8).

2. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The transmission support (11) is a bracket structure. The arc-shaped slide rail (5) is placed on the transmission support (11). The linear guide rail (4) has a groove directly below the center line of the steel pipe. The transmission support (11) is located in the groove.

3. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The arc-shaped slide rail (5) is set at the same center as the rigid outer ring (6), and the two sides of the axial side protrude to form a circumferential U-shaped slide groove. The outer periphery of the rigid outer ring (6) is placed in the U-shaped slide groove.

4. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The tensioning device (7) is a tensioning airbag ring.

5. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The rigid connecting rod (10) extends from the arc-shaped slide rail (5) or the transmission support (11) to the outer end of the steel pipe, and extends from the outer end of the steel pipe back into the steel pipe to the rigid inner ring (8), so as to realize the axial synchronous movement of the rigid inner ring (8) and the rigid outer ring (6).

6. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The cutting device on the rigid outer ring (6) and the cutting device on the rigid inner ring (8) operate on the same plane.

7. The cutting device for double-walled steel pipes according to claim 1, characterized in that: The cutting equipment includes a first cutting device (12) and a second cutting device (13). The first cutting device (12) is a thermal cutting device for cutting the inner and outer pipe walls, and the second cutting device (13) is a blade-type cutting device for cutting the reinforcing ribs (3).

8. The cutting device for double-walled steel pipes according to claim 7, characterized in that: The first cutting device (12) uses laser cutting, plasma cutting, or flame cutting; the second cutting device (13) uses a circular saw.

9. The cutting device for double-walled steel pipes according to claim 7, characterized in that: The cutting device on the rigid outer ring (6) has the same structure as the cutting device on the rigid inner ring (8); Both the rigid outer ring (6) and the rigid inner ring (8) are provided with circumferential guide rails (14). The first cutting device (12) is placed on the circumferential guide rails (14), and the circumferential movement of the first cutting device (12) on the circumferential guide rails (14) is realized through the circumferential transmission assembly. The second cutting device (13) is positioned on the rigid outer ring (6) and the rigid inner ring (8) corresponding to the position of the reinforcing rib (3) by the radial transmission assembly, so as to realize the radial cutting / retraction of the second cutting device (13) on the surface of the steel pipe.

10. The cutting device for double-walled steel pipes according to claim 9, characterized in that: Multiple first cutting devices (12) and second cutting devices (13) are provided. The number of reinforcing ribs (3) in the same cutting plane of the steel pipe is set for the second cutting device (13). One first cutting device (12) is provided between any two adjacent second cutting devices (13).

Images