Nondestructive testing device for anticorrosive coating of pipeline joint coating

Abstract

The utility model discloses a pipeline joint anticorrosive coating nondestructive testing device, which relates to the technical field of nondestructive testing device design, and comprises a nondestructive testing mounting plate, a movable testing unit and a pipeline fixing unit, and four corners of the lower side surface of the nondestructive testing mounting plate are respectively and fixedly connected with a stable supporting leg; a pipeline fixing unit is arranged on the upper side of the nondestructive testing mounting plate, the movable testing unit comprises a movable cylinder, a movable sliding block, a movable supporting plate, a supporting fixing frame and a fixing circular ring, and a sliding groove is formed in the position, located between two pipeline supporting blocks in the pipeline fixing unit, of the upper side surface of the nondestructive testing mounting plate; a movable cylinder is fixedly connected into the sliding groove, a movable sliding block is slidably connected into the sliding groove, when different positions of the pipeline are subjected to nondestructive detection, the pipeline does not need to be rotated for detection, pipeline abrasion is prevented, waste is prevented, the detection time is shortened, and the detection efficiency is not affected.

Description

Technical Field

[0001] This utility model relates to the field of non-destructive testing device design technology, specifically a non-destructive testing device for pipeline repair anti-corrosion layer. Background Technology

[0002] Pipeline joint corrosion protection layer refers to a coating applied to the welded or connected joints of a pipeline for corrosion protection. During pipeline installation or maintenance, special corrosion protection treatment is required to prevent corrosion at these welded or connected joints. Typically, pipeline joint corrosion protection layer is achieved by covering or applying anti-corrosion paint or other anti-corrosion materials to ensure the corrosion resistance of the pipeline connection. To ensure the sealing effect of the pipeline joint, it needs to be inspected. To prevent damage to the corrosion protection layer during inspection, non-destructive testing equipment or devices are required. Therefore, a non-destructive testing device for pipeline joint corrosion protection layer is needed.

[0003] Existing non-destructive testing devices for pipeline joint corrosion protection layers require rotating the pipeline for non-destructive testing at different locations. This can easily cause wear and tear on the pipeline, resulting in waste, increased testing time, and reduced testing efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a non-destructive testing device for pipeline joint corrosion protection layer. When performing non-destructive testing on different positions of the pipeline, it is not necessary to rotate the pipeline for testing, which prevents pipeline wear, prevents waste, reduces testing time, and does not affect testing efficiency. It can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a non-destructive testing device for pipeline joint corrosion protection layer, comprising a non-destructive testing mounting plate, a movable testing unit, and a pipeline fixing unit;

[0006] Non-destructive testing mounting plate: A stable support leg is fixedly connected to each of the four corners of the lower surface, and a pipe fixing unit is provided on the upper side of the non-destructive testing mounting plate;

[0007] The mobile detection unit comprises a movable cylinder, a movable slider, a movable support plate, a support frame, and a fixed ring. A groove is formed on the upper surface of the non-destructive testing mounting plate between two pipe support blocks in the pipe fixing unit. A movable cylinder is fixedly connected within the groove, and a movable slider is slidably connected within the groove. A sliding hole on the movable slider is slidably connected to the corresponding movable cylinder. A movable support plate is fixedly connected to the upper surface of the movable support plate. Two equally spaced support frames are fixedly connected to the upper surface of the movable support plate. A fixed ring is fixedly connected to each support frame, and an annular groove is formed on the inner surface of each fixed ring.

[0008] The non-destructive testing mounting plate is used for installation and use; the stabilizing support legs are used to make the device more stable; the pipe fixing unit is used to fix the pipe; the movable cylinder is used to make the movement of the movable slider more stable; the movement of the movable slider drives the movement of the movable support plate; the movable support plate is used to fix the support frame; the support frame is used to fix the fixing ring; and the fixing ring is used to fix the rotating slider. This facilitates the fixing of the non-destructive testing instrument and makes it convenient for testing.

[0009] Furthermore, the mobile detection unit also includes an electric push rod. A mobile push block is fixedly connected to the upper surface of the mobile support plate at the front and rear sides of the support frame, respectively. The upper surface of the non-destructive testing mounting plate is fixedly connected to the electric push rod at the front and rear sides of the pipe fixing unit through the fixing frame. The extension ends of the two electric push rods are fixedly connected to the corresponding mobile push blocks, respectively. The input end of the electric push rod is electrically connected to the output end of the external power supply through an external control switch group.

[0010] The electric linear actuator is used to provide power for moving the support plate, making it easy to adjust its position for detection at different locations.

[0011] Furthermore, the moving detection unit also includes a rotating slider, a rotating mounting plate, an external gear ring, a power motor, and a rotating gear. A rotating slider is slidably connected to an annular groove on each fixed ring, and a rotating mounting plate is fixedly connected to two rotating sliders. An external gear ring is provided on the left fixed ring, located on the left side surface of the fixed ring. A rack is provided on the outer surface of the external gear ring. The rotating mounting plate is fixedly connected to the power motor via a motor mounting bracket. The output shaft of the power motor is fixedly connected to a rotating cylinder, and a rotating gear is fixedly fitted onto the rotating cylinder. The rotating gear meshes with the corresponding external gear ring. The input end of the power motor is electrically connected to the output end of an external power supply via an external control switch group.

[0012] The rotating slider is used to fix the rotating mounting plate, which in turn fixes the adjusting hydraulic cylinder. This allows the non-destructive testing instrument to rotate, facilitating testing at different locations on the pipeline. The power motor starts, causing the rotating gear to rotate. The rotating gear meshes with the external gear ring, thus providing power for the annular sliding of the rotating mounting plate, facilitating testing.

[0013] Furthermore, the mobile detection unit also includes an adjusting hydraulic cylinder, a fixed support plate, and a non-destructive testing instrument. The rotating mounting plate is fixedly connected to the adjusting hydraulic cylinder via a stabilizing support frame. The extended end of the adjusting hydraulic cylinder passes through the rotating mounting plate and is fixedly connected to the fixed support plate. The fixed support plate is equipped with a non-destructive testing instrument and is positioned between two fixed rings. The input ends of the adjusting hydraulic cylinder and the non-destructive testing instrument are electrically connected to the output end of an external power supply via an external control switch group.

[0014] The adjusting hydraulic cylinder is used to adjust the position of the fixed support plate, which is used to fix the non-destructive testing instrument. The non-destructive testing instrument is an ultrasonic non-destructive testing instrument, which is used for non-destructive testing.

[0015] Furthermore, the pipe fixing unit includes a pipe support block, a connecting rectangular plate, an arc-shaped support plate, and a limiting cylinder. A pipe support block is fixedly connected to the upper surface of the non-destructive testing mounting plate at the left and right sides of the slide groove. Each pipe support block has an arc-shaped groove that penetrates the left and right sides of the corresponding pipe support block. A connecting rectangular plate is fixedly connected to the front and rear sides of each pipe support block. Each connecting rectangular plate has a circular hole that penetrates the upper and lower sides of the corresponding connecting rectangular plate. An arc-shaped support plate is provided on each of the two pipe support blocks. A limiting cylinder is fixedly connected to the lower surface of each arc-shaped support plate at the position corresponding to the circular hole. Each limiting cylinder has a thread that passes through the corresponding circular hole. The thread on each limiting cylinder is threaded to a corresponding nut. Each arc-shaped support plate is fixedly connected to the pipe support block by a nut.

[0016] The pipe support block is used to fix and connect the rectangular plate. The rectangular plate is used to allow the limiting cylinder to pass through, thereby facilitating the fixing of the arc support plate. The arc support plate and the pipe support block work together to facilitate the passage of the pipe and make it easy to fix and clamp it.

[0017] Furthermore, the pipe fixing unit also includes adjusting bolts and fastening arc plates. The screw holes on each arc plate are threadedly connected to the corresponding adjusting bolts, and each adjusting bolt is provided with a fastening arc plate. Each fastening arc plate is in contact with the corresponding pipe.

[0018] The adjusting bolts are used to adjust the position of the fastening arc plate, which is used to clamp the pipe, making the pipe more secure and convenient for testing.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This non-destructive testing device for pipeline joint corrosion protection has the following advantages: It is equipped with a moving detection unit. A moving cylinder ensures more stable movement of the moving slider. The moving slider moves the moving support plate, which in turn moves the support frame. The support frame then fixes the fixed ring, which in turn fixes the rotating slider. An electric push rod provides power for the moving support plate, facilitating position adjustment. The rotating slider fixes the rotating mounting plate, which in turn fixes the adjusting hydraulic cylinder. This allows the non-destructive testing instrument to rotate, facilitating testing at different locations on the pipeline. A power motor starts, causing the rotating gear to rotate. The rotating gear meshes with the external gear ring, providing power for the annular sliding of the rotating mounting plate. The adjusting hydraulic cylinder adjusts the position of the fixed support plate, which in turn fixes the non-destructive testing instrument for non-destructive testing.

[0021] 2. This non-destructive testing device for the anti-corrosion layer of pipe joints has the following advantages: It is equipped with a pipe fixing unit, which uses a pipe support block to fix a rectangular plate. The rectangular plate is used to allow a limiting cylinder to pass through, thereby facilitating the fixing of the arc support plate. The arc support plate and the pipe support block work together to facilitate the passage of the pipe. Adjusting bolts are used to adjust the position of the tightening arc plate, and the tightening arc plate is used to clamp the pipe, making the pipe more firmly fixed.

[0022] 3. This non-destructive testing device for pipeline joint corrosion protection layer has the following advantages: when performing non-destructive testing on different locations of the pipeline, it is not necessary to rotate the pipeline for testing, which prevents pipeline wear, avoids waste, reduces testing time, and does not affect testing efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the rear side of this utility model;

[0025] Figure 3 This is a partial cross-sectional view of the mobile detection unit of this utility model;

[0026] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure in section A.

[0027] In the diagram: 1. Non-destructive testing mounting plate; 2. Stabilizing support leg; 3. Moving testing unit; 31. Moving cylinder; 32. Moving slider; 33. Moving support plate; 34. Electric push rod; 35. Support fixing frame; 36. Fixing ring; 37. Rotating slider; 38. Rotating mounting plate; 39. External gear ring; 310. Power motor; 311. Rotating gear; 312. Adjusting hydraulic cylinder; 313. Fixing support plate; 314. Non-destructive testing instrument; 4. Pipe fixing unit; 41. Pipe support block; 42. Connecting rectangular plate; 43. Arc-shaped support plate; 44. Limiting cylinder; 45. Adjusting bolt; 46. Fastening arc-shaped plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-4 This embodiment provides a technical solution: a non-destructive testing device for pipeline repair corrosion protection layer, including a non-destructive testing mounting plate 1, a moving testing unit 3 and a pipeline fixing unit 4;

[0030] Non-destructive testing mounting plate 1: A stable support leg 2 is fixedly connected to each of the four corners of the lower surface; a pipe fixing unit 4 is provided on the upper side of the non-destructive testing mounting plate 1.

[0031] The moving detection unit 3 includes a moving cylinder 31, a moving slider 32, a moving support plate 33, a support frame 35, and a fixed ring 36. The upper surface of the non-destructive testing mounting plate 1 is provided with a groove between the two pipe support blocks 41 in the pipe fixing unit 4. A moving cylinder 31 is fixedly connected in the groove, and a moving slider 32 is slidably connected in the groove. The sliding hole on the moving slider 32 is slidably connected to the corresponding moving cylinder 31. A moving support plate 33 is fixedly connected to the upper surface of the moving slider 32. Two equally spaced support frames 35 are fixedly connected to the upper surface of the moving support plate 33. A fixed ring 36 is fixedly connected to each support frame 35. An annular groove is provided on the inner surface of each fixed ring 36.

[0032] The non-destructive testing mounting plate 1 is used for installation and use; the stabilizing support leg 2 is used to make the device more stable; the pipe fixing unit 4 is used to fix the pipe; the movable cylinder 31 is used to make the movable slider 32 move more stably; the movable slider 32 moves to drive the movable support plate 33 to move; the movable support plate 33 is used to fix the support fixing frame 35; the support fixing frame 35 is used to fix the fixing ring 36; the fixing ring 36 is used to fix the rotating slider 37, thereby facilitating the fixing of the non-destructive testing instrument 314 and facilitating testing and use.

[0033] The mobile detection unit 3 also includes an electric push rod 34. A mobile push block is fixedly connected to the upper surface of the mobile support plate 33 at the front and rear sides of the support frame 35. The upper surface of the non-destructive testing mounting plate 1 is fixedly connected to the electric push rod 34 at the front and rear sides of the pipe fixing unit 4 through the fixing frame. The extension ends of the two electric push rods 34 are fixedly connected to the corresponding mobile push blocks. The input end of the electric push rod 34 is electrically connected to the output end of the external power supply through an external control switch group.

[0034] The electric push rod 34 provides power for moving the movable support plate 33, facilitating position adjustment for detection at different locations.

[0035] The mobile detection unit 3 also includes a rotating slider 37, a rotating mounting plate 38, an external gear ring 39, a power motor 310, and a rotating gear 311. A rotating slider 37 is slidably connected in an annular groove on each fixed ring 36. A rotating mounting plate 38 is fixedly connected to two rotating sliders 37. An external gear ring 39 is provided on the left fixed ring 36, and the external gear ring 39 is located on the left side surface of the fixed ring 36. A rack is provided on the outer surface of the external gear ring 39. The rotating mounting plate 38 is fixedly connected to the power motor 310 through a motor mounting bracket. The output shaft of the power motor 310 is fixedly connected to a rotating cylinder. A rotating gear 311 is fixedly sleeved on the rotating cylinder. The rotating gear 311 meshes with the corresponding external gear ring 39. The input end of the power motor 310 is electrically connected to the output end of an external power supply through an external control switch group.

[0036] The rotating slider 37 is used to fix the rotating mounting plate 38, and the rotating mounting plate 38 is used to fix the adjusting hydraulic cylinder 312, thereby facilitating the rotation of the non-destructive testing instrument 314 for testing different positions of the pipeline. The power motor 310 is started to rotate the rotating gear 311. The rotating gear 311 meshes with the external gear ring 39, thereby providing power for the annular sliding of the rotating mounting plate 38 for testing purposes.

[0037] The mobile testing unit 3 also includes an adjusting hydraulic cylinder 312, a fixed support plate 313, and a non-destructive testing instrument 314. The adjusting hydraulic cylinder 312 is fixedly connected to the rotating mounting plate 38 via a stable support frame. The extended end of the adjusting hydraulic cylinder 312 passes through the rotating mounting plate 38 and is fixedly connected to the fixed support plate 313. The non-destructive testing instrument 314 is mounted on the fixed support plate 313, which is positioned between two fixed rings 36. The input ends of the adjusting hydraulic cylinder 312 and the non-destructive testing instrument 314 are electrically connected to the output end of an external power supply via an external control switch group.

[0038] The adjusting hydraulic cylinder 312 is used to adjust the position of the fixed support plate 313. The fixed support plate 313 is used to fix the non-destructive testing instrument 314. The non-destructive testing instrument 314 adopts an ultrasonic non-destructive testing instrument for non-destructive testing.

[0039] The pipe fixing unit 4 includes a pipe support block 41, a connecting rectangular plate 42, an arc-shaped support plate 43, and a limiting cylinder 44. A pipe support block 41 is fixedly connected to the upper surface of the non-destructive testing mounting plate 1 at the left and right sides of the slide groove. Each pipe support block 41 has an arc-shaped groove that passes through the left and right sides of the corresponding pipe support block 41. A connecting rectangular plate 42 is fixedly connected to the front and rear sides of each pipe support block 41. Each connecting rectangular plate 42 has a circular hole that passes through the upper and lower sides of the corresponding connecting rectangular plate 42. An arc-shaped support plate 43 is provided on each of the two pipe support blocks 41. A limiting cylinder 44 is fixedly connected to the lower surface of each arc-shaped support plate 43 at the position corresponding to the circular hole. Each limiting cylinder 44 has a thread that passes through the corresponding circular hole. The thread on each limiting cylinder 44 is threaded to the corresponding nut. Each arc-shaped support plate 43 is fixedly connected to the pipe support block 41 by a nut.

[0040] The pipe support block 41 is used to fix the rectangular plate 42, and the rectangular plate 42 is used to allow the limiting cylinder 44 to pass through, thereby facilitating the fixing of the arc support plate 43. The arc support plate 43 and the pipe support block 41 cooperate to facilitate the passage of the pipe and facilitate the fixing and clamping.

[0041] The pipe fixing unit 4 also includes adjusting bolts 45 and fastening arc plates 46. The screw holes on each arc support plate 43 are threadedly connected to the corresponding adjusting bolts 45. Each adjusting bolt 45 is provided with a fastening arc plate 46, and each fastening arc plate 46 is in contact with the corresponding pipe.

[0042] Adjusting bolt 45 is used to adjust the position of fastening arc plate 46. Fastening arc plate 46 is used to clamp the pipe, making the pipe more secure and convenient for testing.

[0043] The working principle of the non-destructive testing device for the anti-corrosion layer of pipe joints provided by this utility model is as follows: First, the pipe passes through the fixed ring 36. The pipe support block 41 is used to fix the rectangular plate 42. The rectangular plate 42 is used to allow the limiting cylinder 44 to pass through, thereby facilitating the fixing of the arc-shaped support plate 43. The arc-shaped support plate 43 and the pipe support block 41 cooperate to facilitate the pipe passage. The adjusting bolt 45 is used to adjust the position of the tightening arc-shaped plate 46. The tightening arc-shaped plate 46 is used to clamp the pipe, making the pipe more firmly fixed. Then, the moving cylinder 31 is used to make the moving slider 32 move more stably. The movement of the moving slider 32 drives the movement of the moving support plate 33. The moving support plate 33 is used to fix the support frame 35 for support and fixation. The frame 35 is used to fix the fixed ring 36, the fixed ring 36 is used to fix the rotating slider 37, the electric push rod 34 is used to provide power for the movement of the moving support plate 33 to facilitate position adjustment, the rotating slider 37 is used to fix the rotating mounting plate 38, the rotating mounting plate 38 is used to fix the adjusting hydraulic cylinder 312, thereby facilitating the rotation of the non-destructive testing instrument 314 for testing different positions of the pipeline, the power motor 310 is started to rotate the rotating gear 311, the rotating gear 311 meshes with the external gear ring 39, thereby providing power for the annular sliding of the rotating mounting plate 38, the adjusting hydraulic cylinder 312 is used to adjust the position of the fixed support plate 313, the fixed support plate 313 is used to fix the non-destructive testing instrument 314, and the non-destructive testing instrument 314 is used for non-destructive testing.

[0044] It is worth noting that the core chip of the external control switch group disclosed in the above embodiments is a PLC microcontroller, the non-destructive testing instrument 314 is an ultrasonic non-destructive testing instrument, the power motor 310 is a servo motor, and the operation of the external control switch group controlling the non-destructive testing instrument 314, the power motor 310, the adjusting hydraulic cylinder 312 and the electric push rod 34 adopts the methods commonly used in the prior art.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A non-destructive testing device for the anti-corrosion coating of pipe joints, characterized in that: It includes a non-destructive testing mounting plate (1), a mobile testing unit (3), and a pipe fixing unit (4); Non-destructive testing mounting plate (1): A stable support leg (2) is fixedly connected to each of the four corners of the lower surface, and a pipe fixing unit (4) is provided on the upper side of the non-destructive testing mounting plate (1); The moving detection unit (3) includes a moving cylinder (31), a moving slider (32), a moving support plate (33), a support bracket (35), and a fixed ring (36). The upper surface of the non-destructive testing mounting plate (1) is provided with a groove between two pipe support blocks (41) in the pipe fixing unit (4). A moving cylinder (31) is fixedly connected in the groove, and a moving slider (32) is slidably connected in the groove. The sliding hole on the moving slider (32) is slidably connected to the corresponding moving cylinder (31). A moving support plate (33) is fixedly connected to the upper surface of the moving slider (32). Two equally spaced support brackets (35) are fixedly connected to the upper surface of the moving support plate (33). A fixed ring (36) is fixedly connected to each support bracket (35), and an annular groove is provided on the inner surface of each fixed ring (36).

2. The non-destructive testing device for pipeline joint corrosion protection layer according to claim 1, characterized in that: The moving detection unit (3) also includes an electric push rod (34). The upper surface of the moving support plate (33) is fixedly connected to a moving push block at the front and rear sides of the support fixing frame (35). The upper surface of the non-destructive testing mounting plate (1) is fixedly connected to the electric push rod (34) at the front and rear sides of the pipe fixing unit (4) through the fixing frame. The extension ends of the two electric push rods (34) are fixedly connected to the corresponding moving push blocks. The input end of the electric push rod (34) is electrically connected to the output end of the external power supply through an external control switch group.

3. The non-destructive testing device for pipeline joint corrosion protection layer according to claim 1, characterized in that: The moving detection unit (3) also includes a rotating slider (37), a rotating mounting plate (38), an external gear ring (39), a power motor (310), and a rotating gear (311). A rotating slider (37) is slidably connected in an annular groove on each fixed ring (36), and a rotating mounting plate (38) is fixedly connected to two rotating sliders (37). An external gear ring (39) is provided on the fixed ring (36) on the left side. On the left side surface, the outer surface of the external gear ring (39) is provided with a rack. The rotating mounting plate (38) is fixedly connected to the power motor (310) through the motor fixing bracket. The output shaft of the power motor (310) is fixedly connected to the rotating cylinder. A rotating gear (311) is fixedly sleeved on the rotating cylinder. The rotating gear (311) meshes with the corresponding external gear ring (39). The input end of the power motor (310) is electrically connected to the output end of the external power supply through an external control switch group.

4. The non-destructive testing device for pipeline joint corrosion protection layer according to claim 3, characterized in that: The mobile detection unit (3) also includes an adjusting hydraulic cylinder (312), a fixed support plate (313), and a non-destructive testing instrument (314). The adjusting hydraulic cylinder (312) is fixedly connected to the rotating mounting plate (38) via a stable support frame. The extended end of the adjusting hydraulic cylinder (312) passes through the rotating mounting plate (38) and is fixedly connected to the fixed support plate (313). The non-destructive testing instrument (314) is installed on the fixed support plate (313). The fixed support plate (313) is positioned between two fixed rings (36). The input ends of the adjusting hydraulic cylinder (312) and the non-destructive testing instrument (314) are electrically connected to the output end of an external power supply via an external control switch group.

5. The non-destructive testing device for pipeline joint corrosion protection layer according to claim 1, characterized in that: The pipe fixing unit (4) includes a pipe support block (41), a connecting rectangular plate (42), an arc-shaped support plate (43), and a limiting cylinder (44). A pipe support block (41) is fixedly connected to the upper surface of the non-destructive testing mounting plate (1) at the left and right sides of the slide groove. An arc-shaped groove is opened on each pipe support block (41), and the arc-shaped groove runs through the left and right sides of the corresponding pipe support block (41). A connecting rectangular plate (42) is fixedly connected to the front and rear sides of each pipe support block (41). An arc-shaped groove is opened on each connecting rectangular plate (42). There are round holes, each of which passes through the upper and lower sides of the corresponding connecting rectangular plate (42). Each of the two pipe support blocks (41) is provided with an arc-shaped support plate (43). The lower surface of each arc-shaped support plate (43) is fixedly connected to a limiting cylinder (44) at the position corresponding to the round hole. Each limiting cylinder (44) is provided with a thread. Each limiting cylinder (44) passes through the corresponding round hole. The thread on each limiting cylinder (44) is threadedly connected to the corresponding nut. Each arc-shaped support plate (43) is fixedly connected to the pipe support block (41) by a nut.

6. The non-destructive testing device for pipeline joint corrosion protection layer according to claim 5, characterized in that: The pipe fixing unit (4) also includes adjusting bolts (45) and fastening arc plates (46). The screw holes on each arc support plate (43) are threadedly connected to the corresponding adjusting bolts (45). Each adjusting bolt (45) is provided with a fastening arc plate (46), and each fastening arc plate (46) is in contact with the corresponding pipe.

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