Magnetostrictive ultrasonic guided wave inspection device for pressure vessel shells

Abstract

The application belongs to the technical field of flaw detection equipment and relates to a magnetostrictive ultrasonic guided wave flaw detection device for a pressure vessel cylinder. The device comprises a fixing seat, a supporting mechanism and a detection mechanism fixedly installed on the same side of the fixing seat. The supporting mechanism comprises a first fixing rod and a first roller assembly. The detection mechanism comprises a second fixing rod, a second roller assembly, an arc-shaped electric sliding rail, a third roller assembly, a connecting strip and a magnetostrictive ultrasonic guided wave flaw detector. By adjusting the distance between the two first electric drive rollers, the device can stably support pressure vessels with different diameters and is suitable for pressure vessels with only one open end. By moving the arc-shaped electric sliding rail, the device can be used for pressure vessels with different lengths. By moving one end of the connecting strip along the arc-shaped electric sliding rail, the connecting strip is wound around the cylinder of the pressure vessel, so that the magnetostrictive ultrasonic guided wave flaw detector is kept in close contact with the outer wall of the pressure vessel, and the detection is more accurate.

Description

Technical Field

[0001] This invention belongs to the field of flaw detection equipment technology, and relates to a magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders. Background Technology

[0002] Pressure vessels are sealed containers that bear pressure loads. Because pressure vessels must withstand certain pressures, defects such as internal cracks and pores can cause safety accidents. Therefore, non-destructive testing (NDT) of pressure vessels is particularly important. Application No. 202111185821.3 proposes a large-scale non-destructive testing machine for steel pipes, comprising one L-shaped support, two L-shaped supports, two linear transmission devices, four inverted U-shaped supports, four rollers, a base plate, two connecting plates, four rollers, at least three magnetostrictive ultrasonic guided wave flaw detectors, a telescopic rod, a slide rail, two slide rails, and two linear transmission devices. In use, the steel pipe is fixed by hooking its two ends, and then the internal rollers cooperate with the external rollers to rotate the steel pipe, thereby inspecting the circumference of the steel pipe. This device is suitable for steel pipes of different lengths and diameters. However, this device cannot be used for pressure vessels with only one open end. Furthermore, when the diameter of the steel pipe is greater than the distance between the two rollers, the steel pipe is supported by the rollers at both ends, which makes the steel pipe prone to shaking and cannot guarantee the smooth rotation of the steel pipe. In some cases, the steel pipe may even slip relative to the rollers, making it difficult to rotate.

[0003] To address the aforementioned problems, this invention proposes a magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention proposes a magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: it includes a fixed base, on the same side of which a support mechanism and a detection mechanism are fixedly installed;

[0006] The support mechanism includes a first fixed rod and a first roller assembly;

[0007] One end of the first fixing rod is horizontally fixed to the fixing base. The first roller assembly has multiple sets, and the multiple sets of first roller assemblies are distributed at intervals along the length direction of the first fixing rod. Each set of first roller assemblies includes a bidirectional cylinder. The cylinder barrel of the bidirectional cylinder is fixedly mounted on the first fixing rod, and a first electrically driven roller is fixedly installed on each of the two push rods of the bidirectional cylinder.

[0008] The detection mechanism includes a second fixed rod, a second roller assembly, an arc-shaped electric slide rail, a third roller assembly, a connecting strip, and a magnetostrictive ultrasonic guided wave flaw detector;

[0009] One end of the second fixing rod is horizontally fixed to the fixing base; the second roller assembly slides longitudinally with the end of the second fixing rod away from the fixing base; the arc-shaped electric slide rail slides with the second fixing rod along the length of the second fixing rod; a second slider is provided on the arc-shaped electric slide rail, and the third roller assembly slides longitudinally with the second slider; the connecting strip is fixedly disposed between the second roller assembly and the third roller assembly; the connecting strip is made of flexible material; and the magnetostrictive ultrasonic guided wave flaw detector is fixed on the connecting strip.

[0010] Furthermore, a first linear motor is installed on the lower end face of the second fixed rod along the length direction of the second fixed rod; a first slider is fixedly mounted on the first linear motor, and the first slider is fixedly connected to the arc-shaped electric slide rail; the first linear motor is a U-shaped groove linear motor.

[0011] Furthermore, the arc-shaped electric slide rail is a second linear motor with an arc-shaped guide rail; the arc-shaped electric slide rail includes a second linear motor body and an arc-shaped guide rail, the second linear motor body cooperates with the arc-shaped guide rail, and the second slider is fixedly mounted on the second linear motor body.

[0012] Furthermore, multiple first roller assemblies are arranged in parallel, and two first electrically driven rollers in each first roller assembly are symmetrically arranged on both sides of the first fixed rod.

[0013] Furthermore, the center of the arc-shaped guide rail of the arc-shaped electric slide rail is located on the axis of the first fixed rod.

[0014] Furthermore, the second roller assembly includes a second electrically driven roller, a first connector, and a first mounting base;

[0015] The second electric drive roller is rotatably connected to the first mounting base, and the first mounting base is fixedly connected to the first connecting member; the second electric drive roller is mounted on the second fixed rod by moving up and down through the first connecting member.

[0016] Furthermore, the first connecting member includes a first slide rod and a first spring;

[0017] The second fixed rod has a first sliding hole, the upper end of the first sliding rod passes through the first sliding hole, and the first sliding rod is longitudinally slidably connected to the second fixed rod; a first stop is fixedly provided at the upper end of the first sliding rod;

[0018] The first spring is sleeved on the first slide rod, and the first spring is located between the first mounting base and the second fixed rod.

[0019] Furthermore, the third roller assembly includes a third electrically driven roller, a second connector, and a second mounting base;

[0020] The second mounting base is fixedly connected to the second connecting member; the third electric drive roller is rotatably mounted on the second mounting base; the third electric drive roller is mounted on the second slider by moving up and down through the second connecting member.

[0021] Furthermore, the second connecting member includes a second slide rod and a second spring;

[0022] The second slider has a second sliding hole, and the second sliding rod passes through the second sliding hole and is longitudinally slidably connected to the second slider; a second stop is fixed at the upper end of the second sliding rod;

[0023] The second spring is sleeved on the second slide rod, and the second spring is located between the second mounting base and the second slider.

[0024] Furthermore, the connecting strip is fixedly disposed between the first mounting base and the second mounting base.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In use, one end of the first fixing rod is inserted into the pressure vessel and abuts against the bottom wall of the pressure vessel, so that the first electric drive roller contacts the inner wall of the pressure vessel, and the axis of the first fixing rod coincides with the axis of the pressure vessel cylinder, which can provide stable support for the pressure vessel. It can be used for pressure vessels with only one open end. Furthermore, the first electric drive roller cooperates with the second and third electric drive rollers to drive the cylinder of the pressure vessel to rotate, so that the pressure vessel rotates smoothly and prevents slippage between the pressure vessel and the first, second, and third electric drive rollers.

[0027] By adjusting the distance between the two first electrically driven rollers in the first roller assembly, pressure vessels of different diameters can be accommodated.

[0028] 2. By moving the arc-shaped electric slide rail, the magnetostrictive ultrasonic guided wave flaw detector can be adapted to the cylinder of pressure vessels of different lengths.

[0029] 3. By moving one end of the connecting strip along the arc-shaped electric slide rail, the connecting strip is wound around the cylinder of the pressure vessel, keeping the magnetostrictive ultrasonic guided wave flaw detector in close contact with the outer wall of the pressure vessel cylinder, making the detection more accurate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the detection mechanism in this invention.

[0032] In the diagram: 1. Fixed base; 2. First fixed rod; 3. Two-way cylinder; 4. First electric drive roller; 5. Second fixed rod; 6. Second electric drive roller; 7. First slide bar; 8. First spring; 9. First linear motor; 10. First slider; 11. Arc-shaped electric slide rail; 12. Second slider; 13. Third electric drive roller; 14. Second slide bar; 15. Second spring; 16. Connecting bar; 17. Magnetostrictive ultrasonic guided wave flaw detector. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1-2 As shown, the technical solution adopted in this invention is as follows: a magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders, comprising a fixed base 1, a support mechanism, and a detection mechanism. Both the support mechanism and the detection mechanism are mounted on the fixed base 1. The fixed base 1 can be installed in a suitable location using fixing bolts.

[0035] The support mechanism includes a first fixed rod 2 and a first roller assembly.

[0036] One end of the first fixing rod 2 is fixedly mounted on the fixing base 1. There are multiple first roller assemblies, which are arranged at intervals along the length of the first fixing rod 2.

[0037] The first roller assembly includes a bidirectional cylinder 3 and a first electrically driven roller 4. The cylinder barrel of the bidirectional cylinder 3 is fixedly mounted on the first fixed rod 2. In this embodiment, the two push rods of the bidirectional cylinder 3 are on the same straight line and move in opposite directions. The first electrically driven roller 4 is fixedly mounted on both push rods of the bidirectional cylinder 3. Both the bidirectional cylinder and the electrically driven roller are prior art and will not be described in detail here.

[0038] Multiple first roller assemblies are arranged in parallel, and the two first electrically driven rollers 4 in each first roller assembly are arranged symmetrically about the axis of the first fixed rod 2.

[0039] The bidirectional cylinder 3 drives two first electrically driven rollers 4 to change the distance between the two electrically driven rollers in the same group, so as to adapt to pressure vessels with different inner diameters. This enables the support mechanism to provide stable support for the pressure vessel.

[0040] In operation, the initial distance between the two first electrically driven rollers 4 in the same group is less than the inner diameter of the pressure vessel. One end of the pressure vessel is fitted onto the support mechanism, and the first electrically driven rollers 4 contact the inner wall of the pressure vessel, supporting it. Multiple first electrically driven rollers 4 are in contact with the inner wall of the pressure vessel, making it more stable. Then, the bidirectional cylinder 3 is activated, and its two push rods extend, gradually increasing the distance between the two first electrically driven rollers 4 in the same group. The first electrically driven rollers 4 push the pressure vessel upwards. When the length of the first roller assembly, i.e., the distance between the outer edges of the two first electrically driven rollers 4, equals the inner diameter of the pressure vessel, the bidirectional cylinder 3 can no longer extend, and the pressure vessel can no longer move up and down along the support mechanism, making the pressure vessel more stable and less prone to shaking.

[0041] The testing mechanism includes a second fixed rod 5, a second roller assembly, an arc-shaped electric slide rail 11, a third roller assembly, a connecting strip 16, and a magnetostrictive ultrasonic guided wave flaw detector 17.

[0042] One end of the second fixing rod 5 is fixedly mounted on the fixing base 1. The second fixing rod 5 and the first fixing rod 2 are located on the same side of the fixing base 1. The second roller assembly is longitudinally movable at the end of the second fixing rod 5 away from the fixing base 1.

[0043] The second roller assembly includes a second electrically driven roller 6, a first connector, and a first mounting plate.

[0044] The first connecting component includes a first slide rod 7 and a first spring 8.

[0045] The second electrically driven roller 6 is rotatably connected to the first mounting plate. The first mounting plate is fixedly connected to the lower end of the first sliding rod 7. The second fixed rod 5 is provided with a first sliding hole, through which the upper end of the first sliding rod 7 slides. A first baffle is fixedly installed on the upper end of the first sliding rod 7. The first baffle keeps the first sliding rod 7 connected to the second fixed rod 5, preventing the first sliding rod 7 from disengaging from the second fixed rod 5. A first spring 8 is sleeved on the second sliding rod 14, and the first spring is located between the second mounting plate and the second fixed rod 5. When the pressure vessel moves upward, it pushes the second electrically driven roller 6 upward, thereby compressing the first spring 8, giving the first spring 8 elastic potential energy, causing the second electrically driven roller 6 to abut against the surface of the pressure vessel.

[0046] The end of the second fixed rod 5 near the fixed base 1 is slidably engaged with the arc-shaped electric slide rail 11, and the arc-shaped electric slide rail 11 slides along the length direction of the second fixed rod 5.

[0047] Specifically, a first linear motor 9 is provided along the length of the second fixed rod 5. The first linear motor 9 is a U-shaped groove linear motor. The arc-shaped electric slide rail 11 is mounted on the first linear motor 9 via a first slider 10. One end of the first slider 10 is fixedly connected to the first linear motor 9, and the other end of the first slider 10 is fixedly connected to the arc-shaped electric slide rail 11. The first linear motor 9 drives the arc-shaped electric slide rail 11 to move along the second fixed rod 5.

[0048] The third roller assembly is mounted on the arc-shaped electric slide rail 11 via the second slider 12. One end of the second slider 12 is fixed to the arc-shaped electric slide rail 11, and the other end of the second slider 12 is longitudinally slidably connected to the third roller assembly.

[0049] The arc-shaped electric slide rail 11 is a second linear motor with an arc-shaped guide rail, including a second linear motor body and an arc-shaped guide rail. The second linear motor body cooperates with the arc-shaped guide rail to drive the second roller assembly to move along the arc-shaped guide rail. The center of the arc-shaped guide rail is located on the axis of the first fixed rod 2. In this way, when the arc-shaped electric slide rail 11 drives the third roller assembly to move, the third roller assembly can maintain contact with the surface of the pressure vessel.

[0050] The third roller assembly includes a third electrically driven roller 13, a second mounting plate, and a second connector.

[0051] The second connecting component includes a second slide bar 14 and a second spring 15.

[0052] The third electrically driven roller 13 is rotatably connected to the second mounting plate. The second mounting plate is fixedly connected to the lower end of the second slide rod 14. The second slider 12 is provided with a second sliding hole, through which the upper end of the second slide rod 14 passes, and the second slide rod 14 and the second slider 12 are slidably engaged through the second sliding hole. A second baffle is fixedly provided at the upper end of the second slide rod 14. The second baffle prevents the second slide rod 14 from disengaging from the second slide rod 14. A second spring 15 is sleeved on the second slide rod 14. The second spring 15 is located between the second slider 12 and the second mounting plate.

[0053] A connecting strip 16 is fixedly installed between the first mounting plate and the second mounting plate. Specifically, the connecting strip 16 is flexibly connected to the first and second mounting plates via an elastic fabric. The connecting strip 16 is made of a flexible material. A magnetostrictive ultrasonic guided wave flaw detector 17 is fixedly installed on the connecting strip 16. Multiple magnetostrictive ultrasonic guided wave flaw detectors 17 are arranged sequentially on the connecting strip 16. The magnetostrictive ultrasonic guided wave flaw detector 17 is positioned similarly to the second electrically driven roller 6 and the third electrically driven roller 13, such that when the second electrically driven roller 6 and the third electrically driven roller 13 come into contact with the pressure vessel, the magnetostrictive ultrasonic guided wave flaw detector 17 is in close contact with the surface of the pressure vessel.

[0054] The arc-shaped electric slide rail 11 moves along the length of the second fixed rod 5 under the action of the first linear motor 9, allowing the magnetostrictive ultrasonic guided wave flaw detector 17 to adapt to pressure vessels of different lengths, facilitating the inspection of pressure vessels of varying lengths. When the arc-shaped electric slide rail 11 moves along the second fixed rod 5 towards the second roller assembly, the connecting bar 16 becomes loose. When the third electrically driven roller 13 moves directly above the pressure vessel, the first linear motor 9 stops, and the arc-shaped electric slide rail 11 starts, causing the third roller assembly to move along the arc-shaped guide rail. This causes the connecting bar 16 to wrap around the pressure vessel, tightening it and ensuring close contact between the magnetostrictive ultrasonic guided wave flaw detector 17 and the pressure vessel surface. The axial arrangement of the magnetostrictive ultrasonic guided wave flaw detector 17 on the pressure vessel becomes more compact, resulting in clearer imaging, eliminating blind spots, and providing more accurate inspection results.

[0055] Working principle: In the initial state, the bidirectional cylinder 3 is in the retracted state, the connecting bar 16 is in the tensioned state, and the detection surface of the magnetostrictive ultrasonic guided wave flaw detector 17 is on the same surface as the lowest point of the second electric drive roller 6 and the third electric drive roller 13.

[0056] In use, the open end of the pressure vessel to be tested is fitted onto the first fixed rod 2 until the first fixed rod 2 extends to the deepest part of the pressure vessel. At this point, the first electrically driven roller 4 contacts the inner wall of the pressure vessel, supporting the pressure vessel, and the support mechanism is located above the center of the pressure vessel. The testing mechanism is located outside the pressure vessel and does not contact it. Then, the first linear motor 9 is started, which drives the arc-shaped electric slide rail 11 to move. The arc-shaped electric slide rail 11 drives the third roller assembly to move closer to the second roller assembly until the third electrically driven roller 13 is directly above the pressure vessel. Then, the first linear motor is turned off. At this time, the connecting bar 16 becomes loose.

[0057] Then, the bidirectional cylinder 3 is activated. The push rod of the bidirectional cylinder 3 drives the first electrically driven roller 4 to move away from the first fixed rod 2. The distance between the two first electrically driven rollers 4 in the same group gradually increases, thereby driving the pressure vessel to move upward. When the distance between the outer edges of the two first electrically driven rollers 4 in the same group is equal to the inner diameter of the pressure vessel, the bidirectional cylinder 3 can no longer extend, the pressure vessel stops moving upward, and then the bidirectional cylinder 3 is closed. At this time, the distance between the outer edges of the two first electrically driven rollers 4 in the same group is equal to the inner diameter of the pressure vessel, and the first electrically driven rollers 4 abut against the inner wall of the pressure vessel, so that the pressure vessel can no longer move upward or downward along the first electrically driven rollers 4, making it easier for the pressure vessel to maintain stability.

[0058] During this process, the pressure vessel moves upward, gradually approaching the second electric drive roller 6 and the third electric drive roller 13, and pushing them upward. The first slide bar 7 moves upward, compressing the first spring 8 and giving it elastic potential energy, causing the second electric drive roller 6 to contact the pressure vessel. The second slide bar 14 moves upward, compressing the second spring 15 and giving it elastic potential energy, causing the third electric drive roller 13 to contact the pressure vessel.

[0059] In this way, the pressure vessel is more easily stabilized by the clamping action of the first electric drive roller 4, the second electric drive roller 6, and the third electric drive roller 13, ensuring smooth rotation. It also prevents slippage between the first electric drive roller 4, the second electric drive roller 6, and the third electric drive roller 13 and the pressure vessel, thus avoiding the inability to rotate.

[0060] Then, the arc-shaped electric slide rail 11 is activated, causing the second linear motor to move along the arc-shaped guide rail. This, in turn, drives the third roller assembly to move along the arc-shaped guide rail, causing the end of the connecting strip 16 connected to the second mounting plate to move along the arc-shaped guide rail. The connecting strip 16 wraps around the surface of the pressure vessel. As the connecting strip 16 gradually wraps around the surface of the pressure vessel, it is gradually tightened, thus bringing the magnetostrictive ultrasonic guided wave flaw detector 17 into contact with the surface of the pressure vessel. Then, the second linear motor is turned off. The magnetostrictive ultrasonic guided wave flaw detector 17 maintaining contact with the pressure vessel results in clearer imaging and more accurate results.

[0061] Then, the first electrically driven roller 4, the second electrically driven roller 6, and the third electrically driven roller 13 are activated, causing the pressure vessel to rotate. Then, the magnetostrictive ultrasonic guided wave flaw detector 17 is activated to perform flaw detection on the pressure vessel. The stable rotation of the pressure vessel allows the magnetostrictive ultrasonic guided wave flaw detector 17 to move across the surface of the pressure vessel, thereby performing a comprehensive flaw detection.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders, characterized in that, include: A fixed base (1) is provided, on the same side of which a support mechanism and a detection mechanism are fixedly installed; The support mechanism includes a first fixed rod (2) and a first roller assembly; One end of the first fixing rod (2) is horizontally fixed on the fixing seat (1). The first roller assembly has multiple sets, and the multiple sets of first roller assemblies are distributed at intervals on the first fixing rod (2) along the length direction of the first fixing rod (2). Each set of first roller assemblies includes a bidirectional cylinder (3). The cylinder barrel of the bidirectional cylinder (3) is fixedly set on the first fixing rod (2). The two push rods of the bidirectional cylinder (3) are fixedly mounted with first electric drive rollers (4). The detection mechanism includes a second fixed rod (5), a second roller assembly, an arc-shaped electric slide rail (11), a third roller assembly, a connecting bar (16), and a magnetostrictive ultrasonic guided wave flaw detector (17); One end of the second fixed rod (5) is horizontally fixed to the fixed seat (1); the second roller assembly and the end of the second fixed rod (5) away from the fixed seat (1) are longitudinally slidably engaged; the arc-shaped electric slide rail (11) and the second fixed rod (5) are slidably engaged in the length direction of the second fixed rod (5); the arc-shaped electric slide rail (11) is provided with a second slider (12), and the third roller assembly and the second slider (12) are longitudinally slidably engaged; the connecting strip (16) is fixedly disposed between the second roller assembly and the third roller assembly; the connecting strip (16) is made of flexible material; the magnetostrictive ultrasonic guided wave flaw detector (17) is fixedly disposed on the connecting strip (16).

2. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 1, characterized in that: A first linear motor (9) is installed on the lower end face of the second fixed rod (5) along the length direction of the second fixed rod (5); a first slider (10) is fixed on the first linear motor (9), and the first slider (10) is fixedly connected to the arc-shaped electric slide rail (11); the first linear motor (9) is a U-shaped groove linear motor.

3. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 1, characterized in that: The arc-shaped electric slide rail (11) is a second linear motor with an arc-shaped guide rail; the arc-shaped electric slide rail (11) includes a second linear motor body and an arc-shaped guide rail, the second linear motor body cooperates with the arc-shaped guide rail, and the second slider (12) is fixedly mounted on the second linear motor body.

4. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 1, characterized in that: Multiple first roller assemblies are arranged in parallel, and two first electric rollers (4) in each first roller assembly are symmetrically arranged on both sides of the first fixed rod (2).

5. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 4, characterized in that: The center of the arc-shaped guide rail of the arc-shaped electric slide rail (11) is located on the axis of the first fixed rod (2).

6. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 1, characterized in that: The second roller assembly includes a second electrically driven roller (6), a first connector, and a first mounting base; The second electric drive roller (6) is rotatably connected to the first mounting base, and the first mounting base is fixedly connected to the first connecting member; the second electric drive roller (6) is mounted on the second fixed rod (5) by moving up and down through the first connecting member.

7. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 6, characterized in that: The first connecting member includes a first slide rod (7) and a first spring (8); The second fixed rod (5) has a first sliding hole, the upper end of the first sliding rod (7) passes through the first sliding hole, and the first sliding rod (7) is longitudinally slidably connected to the second fixed rod (5); the upper end of the first sliding rod (7) is fixed with a first stop block; The first spring (8) is sleeved on the first slide rod (7) and is located between the first mounting base and the second fixing rod (5).

8. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 1, characterized in that: The third roller assembly includes a third electrically driven roller (13), a second connector, and a second mounting base; The second mounting base is fixedly connected to the second connector; the third electric drive roller (13) is rotatably mounted on the second mounting base; the third electric drive roller (13) is moved up and down on the second slider (12) through the second connector.

9. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 8, characterized in that: The second connecting member includes a second slide rod (14) and a second spring (15); The second slider (12) has a second sliding hole, and the second sliding rod (14) passes through the second sliding hole and is longitudinally slidably connected to the second slider (12); the upper end of the second sliding rod (14) is fixed with a second stop; The second spring (15) is sleeved on the second slide bar (14) and is located between the second mounting base and the second slider (12).

10. The magnetostrictive ultrasonic guided wave flaw detection device for pressure vessel cylinders according to claim 8, characterized in that: The connecting strip (16) is fixedly disposed between the first mounting base and the second mounting base.

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