A pipeline weld detection probe guiding, positioning and fixing clamp

Abstract

The utility model discloses a pipeline weld joint detection probe guide positioning fixing clamp belongs to weld joint detection equipment field, including arc plate, sets up in the corresponding position of pipeline outer wall weld joint, arc plate is elastic material, arc plate is provided with a plurality of positioning groove along the arc length direction, and the probe assembly is installed on the positioning groove, and the arc plate inboard of the both sides of positioning groove is provided with the rolling assembly that is symmetrical to front and back, and a plurality of rolling assemblies are all linear contact with the pipeline outer wall, and the included angle of contact line and pipeline center axis is equal. The structure is through the elastic principle of arc plate and is faster to clamp the pipeline, through a plurality of rolling assemblies are all linear contact with the pipeline outer wall, to realize the effect of guiding, and the center axis of motion track of probe assembly follows rotation and rotates with the center axis of pipeline, and the center axis of pipeline is coaxial, and the force exerted on the pipeline outer wall is more uniform, and then probe assembly is attached in the corresponding position of pipeline outer wall weld joint with constant pressure, and the accuracy of detection is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of weld inspection equipment, and in particular to a guide, positioning and fixing fixture for a pipeline weld inspection probe. Background Technology

[0002] After the pipeline is welded, in order to check the sealing degree of the pipeline weld, ultrasonic testing is generally used to inspect the weld to detect defects such as cracks, lack of fusion, porosity, and undercut. During the inspection, the ultrasonic probe is held at the weld or on the side of the weld (such as an angled probe) and moved back and forth along the weld direction and perpendicular to the weld direction. During the movement, the ultrasonic probe is kept in close contact with the surface of the part being inspected to determine whether there are defects in the weld.

[0003] Because handheld ultrasonic probes are inherently unstable during the inspection process—for example, excessive pressure can damage the probe, gaps between the probe and the workpiece can lead to inaccurate results, and reciprocating movement of the probe perpendicular to the weld direction may exceed the inspection area and affect timeliness—existing technologies typically employ clamping devices to hold the pipe, creating a ring-shaped structure. An annular guide rail is positioned on one side of this clamping device, with the ultrasonic probe slidably mounted on it. The probe's detection end is in contact with the outer wall of the pipe, thereby improving the stability of weld inspection.

[0004] However, the inventors of this application discovered the following shortcomings when using the above-mentioned clamping device: 1) When the clamping device is an integral structure, it is only suitable for the inspection of pipes of the same diameter. Although some clamping devices have added adjustment mechanisms in the radial direction of the pipe to adapt to the inspection of welds of pipes of various diameters, so that the clamping device is tightly attached to the pipe and fixed, the addition of adjustment mechanisms causes the center of the ring track to deviate from the axis of the pipe, i.e., misalignment. Since the ultrasonic testing probe slides along the ring guide rail, the pressure in some local positions may be too high, which may damage the ultrasonic testing probe. Conversely, the pressure in other positions may be too low or even non-contact, resulting in inaccurate test results. 2) When the clamping device is a split structure, it takes more time to install, and the same situation as in 1) will occur after installation. Utility Model Content

[0005] The purpose of this invention is to provide a guide, positioning and fixing fixture for a pipeline weld inspection probe, in order to solve the problems of excessive pressure, insufficient pressure or gaps when the ultrasonic probe moves along a predetermined trajectory.

[0006] To achieve the above objectives, the following technical solution is adopted: a guide, positioning, and fixing fixture for a pipeline weld inspection probe, comprising an arc-shaped plate disposed at a corresponding position on the weld on the outer wall of the pipeline. The arc-shaped plate is made of an elastic material, and the arc-shaped plate is provided with a plurality of positioning grooves along the arc length direction for observing whether the weld exceeds the inspection area. A probe assembly is installed on one of the positioning grooves. symmetrical rolling components are provided on the inner sides of the arc-shaped plate on both sides of the positioning groove. All of the rolling components are in linear contact with the outer wall of the pipeline, and the angle between the contact line and the central axis of the pipeline is equal. When the pipe is cylindrical, the contact line is parallel to the central axis of the pipe, meaning the angle between the contact line and the central axis is zero degrees. When the outer wall of the pipe has an annular inclined surface, the contact line between the rolling assembly and the outer wall of the pipe has a predetermined angle with the central axis of the pipe, and these predetermined angles are equal. This allows the arc plate to rotate along a predetermined trajectory when rotating, achieving the effect of guidance and positioning. During the rotation of the arc plate, the elasticity of the arc plate and the guiding effect of the rolling assembly ensure that the probe assembly always maintains a predetermined distance from the outer wall of the pipe. Consequently, the probe assembly can fit against the corresponding position of the weld on the outer wall of the pipe without excessive pressure, insufficient pressure, or gaps.

[0007] Preferably, the rolling assembly includes two mounting seats fixed to the inner side of the arc-shaped plate, and a rolling element is connected between the two mounting seats via a connecting shaft. The rolling element is configured according to the shape of the pipe's outer wall; when the pipe's outer wall is cylindrical, the rolling element is cylindrical; when the pipe's outer wall is conical, the rolling element is conical. This ensures that the rolling assembly, i.e., the rolling element, makes linear contact with the pipe's outer wall, thereby ensuring that the contact lines between several rolling elements and the pipe's outer wall form equal angles with the pipe's central axis, thus achieving guiding and positioning during the detection process.

[0008] Preferably, the probe assembly includes a fixed frame that is slidably mounted on a positioning groove in a front-to-back direction. An annular component is slidably mounted in the fixed frame along the radial direction of an arc-shaped plate. The probe is installed inside the annular component. A support is provided on the outer wall of the annular component located below the fixed frame. A first connecting rod is provided on the support. The upper end of the first connecting rod extends through a limiting hole into the fixed frame and is connected to a limiting block. A first elastic element is connected to the first connecting rod located outside the annular component, with its two ends connected to the support and the fixed frame, respectively. A second connecting rod is threaded to the top of the fixed frame. The second connecting rod has a downward-opening connecting hole. A pressure rod is slidably connected in the connecting hole. The lower end of the pressure rod abuts against the upper surface of the probe. A second elastic element is connected to the upper end of the pressure rod. The other end of the second elastic element is connected to the bottom of the connecting hole. Installation of the probe is simple: just insert the probe into the bottom of the annular component. Simultaneously, due to the partial opening at the top of the fixed frame, the probe is connected to the weld inspection instrument via a connecting wire. Under the action of the first elastic element, the annular component can move a predetermined distance relative to the fixed frame, facilitating its fit against the outer wall of the pipe. Under the action of the second elastic element, the probe is adjusted to ensure it is tightly against the outer wall of the pipe being tested. Simultaneously, the first elastic element ensures that both the annular component and the probe are tightly against the outer wall of the pipe being tested, completing the corresponding inspection. Since the second connecting rod is threaded to the upper end of the fixed frame, the pressure applied to the probe can be adjusted.

[0009] Preferably, the annular component has an annular cavity, and the bottom of the annular cavity has several liquid outlet holes communicating with the outside. The annular cavity is filled with absorbent material and coupling agent; wherein the absorbent material is preferably a cotton-like substance, such as a sponge or cotton cloth. When inspecting weld quality with a probe, coupling agent is usually required to eliminate air between the probe and the outer wall of the pipe, so as to achieve efficient transmission to the weld seam of the pipe, improve accuracy and reliability. Since the annular component can move a predetermined distance relative to the fixed frame under the action of the first elastic element, the annular component fits against the outer wall of the pipe, and thus the coupling agent is applied to the outer wall of the pipe through the liquid outlet holes during the probe movement, that is, the application work is completed before detection, so that the application is more uniform and the application area is the detection area.

[0010] Preferably, a reciprocating assembly is provided on the arc-shaped plate adjacent to the probe assembly. The reciprocating assembly causes the probe assembly to reciprocate in the back-and-forth direction according to the rolling of the rolling element. The reciprocating assembly enables the probe to move not only along the weld direction but also in a direction perpendicular to the weld, making the probe's active area more uniform and thus the detection results more reliable.

[0011] Preferably, the reciprocating assembly includes a first gear that is drivenly connected to the connecting shaft and disposed on the outer wall of the front side of the arc-shaped plate, and a second gear and a third gear respectively disposed on the outer wall of the front side of the arc-shaped plate. The second gear meshes with the first gear and the third gear respectively. A drive shaft is rotatably connected to the positioning groove on one side of the probe assembly. The drive shaft is arranged in the front-rear direction. The front end of the drive shaft extends to the outer wall of the arc-shaped plate and is drivenly connected to the third gear. A cylindrical member is disposed on the drive shaft. The cylindrical surface of the cylindrical member is provided with an annular groove. The annular groove has a wave-shaped structure. A guide rod is connected to the outer wall of the fixed frame near the drive shaft. The other end of the guide rod extends into the annular groove and slides therewith. A plurality of sliding rods are disposed in the positioning groove in the front-rear direction. The two ends of the sliding rods are fixed to the groove wall of the positioning groove. The fixed frame is provided with sliding holes that slide with the sliding rods. When the arc-shaped plate rotates, the rolling element located on one side of the probe assembly rolls, sequentially driving the second and third gears to rotate, which in turn rotates the drive shaft. This causes the cylindrical component on the drive shaft to rotate. Since one end of the guide rod is connected to the fixed frame and the other end is slidably connected to the annular groove of the cylindrical component, and the annular groove has a wavy structure, while the fixed frame is slidably mounted on the slide rod, the rolling element can drive the fixed frame to move in the back-and-forth direction, thereby causing the probe to reciprocate. Therefore, the reciprocating assembly allows the probe to move not only along the weld direction but also in a direction perpendicular to the weld, making the probe's active area more uniform and thus the detection results more reliable.

[0012] Preferably, the arc length of the arc plate is located between the circumference of the pipe and half of the circumference, that is, the arc length of the arc plate is less than the circumference of the outer wall of the pipe, but greater than half of the circumference of the outer wall of the pipe, so as to clamp the pipe more quickly and adapt to the pipe inspection within the corresponding range.

[0013] Preferably, the outer wall of the rolling element is provided with a layer of anti-slip rubber to prevent axial movement of the arc plate, thus ensuring that the probe assembly will not move axially when it moves along the predetermined trajectory.

[0014] The beneficial effects achieved by this utility model are: Compared to existing technologies, this utility model provides a pipe weld inspection probe guide positioning and fixing fixture. By utilizing the elasticity of an arc-shaped plate, the pipe is clamped more quickly. Multiple rolling components are in linear contact with the outer wall of the pipe, thus achieving a guiding function. Based on this, the probe assembly is installed on the positioning groove, making the force applied by the probe assembly to the outer wall of the pipe more uniform during the rotation of the arc-shaped plate. Consequently, the probe assembly adheres to the corresponding position of the weld on the outer wall of the pipe with constant pressure, without excessive or insufficient pressure or gaps, thereby improving the accuracy of the inspection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the structure of this utility model from below; Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 for Figure 3 Enlarged structural diagram at point C; Figure 6 This is an internal sectional view of the probe assembly of this utility model; Figure 7 This is a top view of the probe assembly of this utility model.

[0016] In the diagram: Arc plate-1, Positioning groove-2, Probe assembly-3, Fixing frame-31, Annular part-32, Annular cavity-321, Probe-33, Support-34, First connecting rod-35, Limiting block-36, First elastic element-37, Second connecting rod-38, Pressure rod-39, Second elastic element-310, Rolling assembly-4, Mounting seat-41, Connecting shaft-42, Rolling element-43, Reciprocating assembly-5, First gear-51, Second gear-52, Third gear-53, Drive shaft-54, Columnar part-55, Annular groove-56, Guide rod-57, Slide rod-58. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Please see the appendix Figure 1-7This utility model discloses a guide, positioning, and fixing fixture for a pipeline weld inspection probe, including an arc-shaped plate 1, which is set at the corresponding position of the weld on the outer wall of the pipeline. The arc-shaped plate 1 is made of an elastic material to adapt to the inspection of pipeline welds of different diameters. The arc-shaped plate 1 is provided with a plurality of positioning grooves 2 along the arc length direction for observing whether the weld exceeds the inspection area. A probe assembly 3 is installed on one of the positioning grooves 2. The inner sides of the arc-shaped plate 1 on both sides of the positioning groove 2 are provided with symmetrical rolling assemblies 4. The multiple rolling assemblies 4 are in linear contact with the outer wall of the pipeline, and the angle between the contact line and the central axis of the pipeline is equal. When the pipe is cylindrical, the contact line is parallel to the central axis of the pipe, meaning the angle between the contact line and the central axis of the pipe is zero degrees. When the outer wall of the pipe has an annular inclined surface, the contact line has a predetermined angle with the central axis of the pipe, so that the arc plate rotates along a predetermined trajectory when the arc plate is rotated, thereby achieving the effect of guidance and positioning. During the rotation of the arc plate 1, the elastic clamping of the arc plate onto the pipe, and the guiding effect of the rolling component, ensure that the probe assembly always maintains a predetermined distance from the outer wall of the pipe. Thus, the probe assembly can fit against the corresponding position of the weld on the outer wall of the pipe without excessive pressure, insufficient pressure, or gaps.

[0020] In this embodiment, specifically, the rolling assembly 4 includes two mounting seats 41 fixed to the inner side of the arc plate 1, and a rolling element 43 is connected between the two mounting seats 41 through a connecting shaft 42. The rolling element 43 is set according to the shape of the outer wall of the pipe. When the outer wall of the pipe is cylindrical, the rolling element 43 is a cylindrical rolling element; when the outer wall of the pipe is conical, the rolling element 43 is a conical rolling element. This ensures that the rolling assembly 4, i.e., the rolling element 43, is in linear contact with the outer wall of the pipe, and that the contact lines between several rolling elements 43 and the pipe are at equal angles with the central axis of the pipe. This allows the probe assembly 3 to follow the arc plate 1 along a predetermined trajectory, meaning that the central axis of the movement trajectory of the probe assembly 3 always coincides with the central axis of the pipe. This avoids situations where the pressure applied by the probe assembly to the outer wall of the pipe is too high, too low, or has gaps, i.e., uneven pressure, making the detection results more accurate and reliable. The front and rear rolling components are connected by a fixed rod, which allows the two rolling elements 43 to rotate synchronously. It should be noted that the rolling elements are located on both sides of the weld and act on the outer wall of the pipe, making the rolling elements roll more smoothly during the inspection process.

[0021] In this embodiment, the probe assembly 3 includes a fixed frame 31, which is slidably mounted on the positioning groove 2 in the front-to-back direction. An annular component 32 is slidably mounted inside the fixed frame 31 in the radial direction of the arc-shaped plate 1. A probe 33 is installed inside the annular component 32. This allows for easy installation of the probe 33 simply by inserting it from the bottom of the annular component 32. Furthermore, due to the partial opening at the top of the fixed frame 31, the probe 33 can be connected to a weld inspection instrument (i.e., a weld flaw detector) via a connecting wire. A support is provided on the outer wall of the annular component 32 located below the fixed frame 31. The support 34 is provided with a first connecting rod 35. The upper end of the first connecting rod 35 extends through a limiting hole into the fixed frame 31 and connects to a limiting block 36. A first elastic element 37 is connected to the first connecting rod 35 located outside the annular part 32. Its two ends are respectively connected to the support 34 and the fixed frame 31. This allows the annular part 32 to move a predetermined distance relative to the fixed frame 31 under the action of the first elastic element 37, so that the annular part 32 can fit against the outer wall of the pipe. A second connecting rod 38 is threaded to the top of the fixed frame 31. The connecting rod 38 has a downward-opening connecting hole, and a pressure rod 39 is slidably connected in the connecting hole. The lower end of the pressure rod 39 abuts against the upper surface of the probe 33, and the upper end of the pressure rod 39 is connected to a second elastic element 310. The other end of the second elastic element 310 is connected to the bottom of the connecting hole. Both the first elastic element 37 and the second elastic element 310 are springs. Therefore, under the action of the second elastic element 310, the probe 33 is pressed tightly against the outer wall of the pipe being tested, while under the action of the first elastic element 37, the annular part 32 and the probe are pressed tightly against the outer wall of the pipe being tested. The corresponding tests are completed at the wall. Since the second connecting rod 38 is threaded to the upper end of the fixed frame 31, it is convenient to adjust the pressure applied to the probe 33 by the pressure rod 39. After the adjustment, since the probe 33 follows the arc plate 1 to move in a ring along the predetermined trajectory, and the central axis of the probe's movement trajectory always coincides with the central axis of the pipe, the pressure applied to the probe 33 by the pressure rod 39 will not change significantly during the probe's movement. That is, the pressure applied by the probe to the pipe is a constant pressure, which makes the pressure moderate and will not cause damage to the probe, and the test results are more accurate.

[0022] In this embodiment, when detecting weld quality using a probe, a coupling agent is typically used to eliminate air between the probe and the pipe wall when the probe is in contact with the pipe wall, thereby achieving efficient transmission to the weld and improving accuracy and reliability. Previously, the coupling agent was manually applied to the corresponding location on the weld, which could result in incomplete application, excessively large application areas, or uneven application. Therefore, in this embodiment, an annular cavity 321 is provided within the annular component 32. The bottom of the annular cavity 321 has several outlet holes communicating with the outside. The annular cavity 321 is filled with absorbent material and coupling agent; the absorbent material is preferably a cotton-like substance, such as a sponge or cotton cloth. Since the annular component 32 can move a predetermined distance relative to the fixed frame 31 under the action of the first elastic element 37, the annular component 32 is in contact with the pipe wall. This allows the coupling agent to be applied to the pipe wall through the outlet holes during probe movement, completing the application operation before detection. This results in more uniform application and the applied area being the detection area.

[0023] In this embodiment, since the probe assembly needs to move not only along the weld direction but also reciprocate along a direction perpendicular to the weld to improve accuracy, a reciprocating assembly 5 is provided on the arc plate 1 adjacent to the probe assembly 3. The reciprocating assembly 5 causes the probe assembly 3 to reciprocate in the front-back direction based on the rolling of the rolling element 43. Specifically, the reciprocating assembly 5 includes a first gear 51 connected to the connecting shaft 42 and disposed on the front outer wall of the arc plate 1, and a second gear 52 and a third gear 53 respectively disposed on the front outer wall of the arc plate 1. The second gear 52 meshes with the first gear 51 and the third gear 53 respectively. A drive shaft 54 ​​is rotatably connected to the positioning groove 2 on one side of the probe assembly 3. The drive shaft 54 ​​is arranged in the front-back direction, and its front end extends to the outer wall of the arc plate 1 and is connected to the third gear 53. A cylindrical member 55 is provided on the drive shaft 54. The cylindrical surface of the cylindrical member 55 is provided with an annular groove 56. The annular groove 56 has a wave-shaped structure. A guide rod 57 is connected to the outer wall of the fixed frame 31 near the drive shaft 54. The other end of the guide rod 57 extends into the annular groove 56 and slides with it. A plurality of sliding rods 58 are provided in the positioning groove 2 along the front-back direction. The two ends of the sliding rods 58 are fixed to the groove wall of the positioning groove 2. The fixed frame 31 is provided with sliding holes that slide with the sliding rods 58. When the arc plate 1 is rotated, the rolling element 43 located on one side of the probe assembly 3 rolls. The rolling element 43 sequentially drives the second gear 52 and the third gear 53 to rotate, which in turn causes the drive shaft 54 ​​to rotate. This causes the cylindrical component 55 on the drive shaft 54 ​​to rotate. Since one end of the guide rod 57 is connected to the fixed frame 31 and the other end is slidably connected to the annular groove 56 of the cylindrical component 55, and the annular groove 56 has a wave-shaped structure with crests and troughs, and the fixed frame 31 is slidably mounted on the slide rod 58, the rolling element 43 can drive the fixed frame 31 to move in the front-back direction when it rolls, thereby driving the probe 33 to reciprocate. Therefore, the reciprocating assembly 5 allows the probe to move not only along the weld direction but also in a direction perpendicular to the weld, making the probe's active area more uniform and thus the detection results more reliable.

[0024] In this embodiment, the arc length of the arc plate 1 is located between the pipe circumference and half of the pipe circumference. That is, the arc length of the arc plate is less than the circumference of the pipe outer wall, but greater than half of the pipe outer wall circumference, so as to clamp the pipe more quickly and is suitable for clamping pipes within a certain diameter range.

[0025] In this embodiment, the outer wall of the rolling element 43 is provided with a layer of anti-slip rubber to prevent the arc plate from moving axially, thus ensuring that the probe assembly will not move along the predetermined trajectory.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A guide, positioning, and fixing fixture for a pipeline weld inspection probe, comprising an arc-shaped plate (1) disposed at a corresponding position on the outer wall of the pipeline weld, characterized in that, The arc plate (1) is made of elastic material. The arc plate (1) is provided with a number of positioning grooves (2) along the arc length direction. A probe assembly (3) is installed on one of the positioning grooves (2). The inner sides of the arc plate (1) on both sides of the positioning groove (2) are provided with symmetrical rolling assemblies (4). All of the rolling assemblies (4) are in linear contact with the outer wall of the pipe, and the angle between the contact line and the central axis of the pipe is equal. A reciprocating assembly (5) is provided on the arc plate (1) adjacent to the probe assembly (3). The reciprocating assembly (5) causes the probe assembly (3) to reciprocate in the front-back direction according to the rolling of the rolling body (43). The reciprocating assembly (5) includes a first gear (51) that is connected to the connecting shaft (42) and is provided on the front outer wall of the arc plate (1), and a second gear (52) and a third gear (53) that are respectively provided on the front outer wall of the arc plate (1). The second gear (52) meshes with the first gear (51) and the third gear (53) respectively.

2. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 1, characterized in that: The rolling assembly (4) includes two mounting seats (41) fixed inside the arc plate (1), and a rolling element (43) is connected between the two mounting seats (41) by a connecting shaft (42).

3. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 2, characterized in that: The probe assembly (3) includes a fixed frame (31) which is slidably mounted on a positioning groove (2) in the front-back direction. An annular component (32) is slidably mounted inside the fixed frame (31) in the radial direction of the arc plate (1). A probe (33) is installed inside the annular component (32). A support (34) is provided on the outer wall of the annular component (32) located below the fixed frame (31). A first connecting rod (35) is provided on the support (34). The upper end of the first connecting rod (35) extends through a limiting hole into the fixed frame (31) and connects to a limiting block (36). The probe (33) is located on the annular component (32). 2) A first elastic element (37) is connected to the first connecting rod (35) outside, and its two ends are respectively connected to the support (34) and the fixed frame (31); a second connecting rod (38) is threaded to the top of the fixed frame (31), and a downward-opening connecting hole is provided on the second connecting rod (38). A pressure rod (39) is slidably connected in the connecting hole. The lower end of the pressure rod (39) abuts against the upper surface of the probe (33). The upper end of the pressure rod (39) is connected to a second elastic element (310), and the other end of the second elastic element (310) is connected to the bottom of the connecting hole.

4. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 3, characterized in that: The annular component (32) is provided with an annular cavity (321), and the bottom of the annular cavity (321) is provided with several liquid outlet holes communicating with the outside. The annular cavity (321) is filled with liquid-absorbing material and coupling agent.

5. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 4, characterized in that: A drive shaft (54) is rotatably connected to the positioning groove (2) on one side of the probe assembly (3). The drive shaft (54) is arranged in the front-back direction. The front end of the drive shaft (54) extends to the outer wall of the arc plate (1) and is connected to the third gear (53) for transmission. A columnar part (55) is provided on the drive shaft (54). An annular groove (56) is provided on the cylindrical surface of the columnar part (55). The annular groove (56) has a wave-shaped structure. A guide rod (57) is connected to the outer wall of the fixed frame (31) near the drive shaft (54). The other end of the guide rod (57) extends into the annular groove (56) and slides with it. A number of sliding rods (58) are provided in the positioning groove (2) in the front-back direction. The two ends of the sliding rods (58) are fixed at the groove wall of the positioning groove (2). A sliding hole is provided on the fixed frame (31) to slide with the sliding rods (58).

6. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 1, characterized in that: The arc length of the arc plate (1) is located between the circumference of the pipe and half of the circumference.

7. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 2, characterized in that: The outer wall of the rolling element (43) is provided with a layer of anti-slip rubber.

8. The guide, positioning, and fixing fixture for the pipeline weld inspection probe according to claim 3, characterized in that: Both the first elastic element (37) and the second elastic element (310) are springs.

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