Radioactive source-based assistance apparatus for inspecting butt weld of small-diameter pipe

Abstract

Disclosed in the present invention is a radioactive source-based assistance apparatus for inspecting a butt weld of a small-diameter pipe, comprising: an adjusting module, comprising a first adjusting rod, an adjusting block being slidably connected to the outer surface of the first adjusting rod, a second adjusting rod being rotatably connected to the outer top wall of the adjusting block, clamping assemblies being symmetrically arranged on the left side and the right side inside the adjusting block, a rotating assembly being transmittingly connected at the bottom ends of the two clamping assemblies, and snap-fit assemblies being transmittingly connected to the outer side of the rotating assembly; and a fixing module, comprising a fixing hoop arranged at the front end of the first adjusting rod, a fixing assembly being movably mounted at the front end of the fixing hoop. The apparatus can rapidly fix a radioactive source to an inspected pipeline, a focal length and an incident angle of the radioactive source are accurately determined, and it is guaranteed that the quality of a negative film meets the standard requirements. Moreover, the apparatus has the advantages of reasonable structural design, simple operation and high reliability and greatly improves the work efficiency.

Description

An auxiliary device for detecting butt welds of small-diameter pipes using a radioactive source Technical Field

[0001] The invention relates to the technical field of steel pipe weld detection equipment, in particular to an auxiliary device for detecting butt welds of small-diameter pipes with a radioactive source. Background Art

[0002] In order to ensure the quality of steel pipe butt welds, radiographic inspection is usually used to check the internal quality of the welds. When using a radioactive source for inspection, the radioactive source must be fixed on the pipe to which the weld belongs to complete the exposure. During radiographic inspection, the radioactive source must maintain a certain distance (focal length) from the weld. Double-wall double-shadow elliptical imaging is generally used, requiring the film weld image to maintain a certain opening width, and the radiation needs to be irradiated at a certain inclination angle to the weld.

[0003] However, the traditional detection method usually involves manual handheld detection of steel pipe welds. Handheld detection by workers is prone to shaking, resulting in inaccurate test results, causing workers to make misjudgments and affecting the subsequent use of the steel pipe. In response to this, we propose an auxiliary device for radioactive source detection of small-diameter pipe butt welds.

[0004] Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0007] Therefore, the technical problem to be solved by the present invention is that after the wire strippers are used, a large amount of debris will remain on site, which is difficult to clean.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: an auxiliary device for detecting butt welds of small-diameter tubes with radioactive sources, comprising: an adjustment module, comprising a first adjustment rod, an outer surface of the first adjustment rod being slidably connected to an adjustment block, an outer top wall of the adjustment block being rotatably connected to a second adjustment rod, clamping assemblies being symmetrically arranged on the left and right sides inside the adjustment block, the bottom ends of the two groups of the clamping assemblies being transmission-connected to a rotating assembly, and the outer sides of the rotating assembly being transmission-connected to a clamping assembly; and a fixing module, comprising a fixing hoop arranged at the front end of the first adjustment rod, a fixing assembly being movably mounted at the front end of the fixing hoop.

[0009] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube for a radioactive source according to the present invention, adjustment grooves are symmetrically opened on both sides of the first adjustment rod, the clamping assembly includes a clamping plate clamped in the adjustment groove, a connecting rod is fixedly installed at one end of the clamping plate away from the adjustment groove, the other end of the connecting rod is fixedly connected to a first telescopic spring, and the bottom end of the connecting rod is fixedly connected to a first sliding rod.

[0010] As a preferred solution of the auxiliary device for detecting the butt weld of small-diameter tubes with radioactive sources described in the present invention, a movable groove is provided in the middle of the adjustment block, and the rotating assembly includes a turntable rotatably connected to the movable groove, a turning rod is fixedly installed at the center of the bottom end of the turntable, the bottom end of the turning rod passes through the inner bottom wall of the adjustment block and extends to the outside thereof where a knob is fixedly connected, an elliptical groove is provided at the top of the turntable, and a sliding groove is provided in the middle of the turning rod.

[0011] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube with a radioactive source according to the present invention, the slide groove is provided with two parts, namely a first part and a second part, and the bottom end of the first part is connected to the bottom end of the second part.

[0012] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube for a radioactive source described in the present invention, the clamping assembly includes a second sliding rod slidably connected to the first part, the end of the second sliding rod away from the rotating rod is fixedly connected to a clamping rod, the bottom end of the clamping rod is fixedly connected to a reset spring, the left end of the clamping rod is fixedly installed with a toggle plate, and the left end of the toggle plate is arranged outside the adjustment block.

[0013] As a preferred solution for the auxiliary device for detecting the butt weld of a small-diameter tube for a radioactive source according to the present invention, contraction grooves are symmetrically provided on the left and right sides of the connection between the adjustment block and the first adjustment rod, the clamping plate is arranged in the contraction groove, and the bottom end of the first sliding rod passes through the inner bottom wall of the contraction groove and extends into the elliptical groove.

[0014] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube with a radioactive source as described in the present invention, an arc groove is provided at the bottom end of the movable groove, a fixed block is fixedly installed at the bottom end of the turntable, the bottom end of the fixed block passes through the movable groove and extends into the arc groove to be fixedly connected with an arc block, and the arc block is slidably connected in the arc groove.

[0015] As a preferred solution of the auxiliary device for detecting butt welds of small-diameter tubes with radioactive sources according to the present invention, the fixing block and the arc block are provided with grooves adapted to the clamping rods.

[0016] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube for a radioactive source according to the present invention, positioning grooves are symmetrically provided on the front and rear sides of the bottom end of the adjustment block, and the top ends of the two positioning grooves are connected to the arc-shaped groove, the clamping rod is arranged at the upper part of the positioning groove, and the reset spring is installed at the lower part of the positioning groove.

[0017] As a preferred solution of the auxiliary device for detecting the butt weld of a small-diameter tube for a radioactive source as described in the present invention, telescopic grooves are symmetrically provided on the left and right sides of the front end of the fixing hoop, and the fixing assembly includes a second telescopic spring respectively installed in the two telescopic grooves, the rear end of the second telescopic spring at the left end is fixedly connected to a movable sleeve, and the rear end of the second telescopic spring at the right end is fixedly connected to a movable plate, a fixed plate is provided at the rear end of the movable plate, and a positioning plate is fixedly connected between the movable plate and the fixed plate by bolts.

[0018] The beneficial effects of the present invention are as follows: the device can quickly fix the radioactive source to the inspected pipe, accurately determine the focal length and the incident angle of the radioactive source, and ensure that the film quality meets the standard requirements. In addition, the device has a reasonable structural design, simple operation, high reliability, and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0020] FIG1 is a perspective view of the overall structure of the present invention.

[0021] FIG2 is a front cross-sectional view of the connection between the adjustment block and the first adjustment rod of the present invention.

[0022] FIG3 is a side sectional view of the connection between the adjustment block and the first adjustment rod of the present invention.

[0023] FIG4 is a first perspective view of the clamping assembly, the rotating assembly, and the clamping assembly of the present invention.

[0024] FIG5 is a side sectional view of the adjustment block of the present invention.

[0025] FIG6 is a front cross-sectional view of the regulating block of the present invention.

[0026] FIG7 is a cross-sectional view of the connection between the adjustment block and the arc block of the present invention.

[0027] FIG8 is a second perspective view of the clamping assembly, the rotating assembly, and the snap-fit ​​assembly of the present invention.

[0028] FIG9 is an enlarged perspective view of the fixing module of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0032] Example 1

[0033] Referring to Figure 1, which is a first embodiment of the present invention, an auxiliary device for detecting butt welds of small-diameter pipes using a radioactive source is provided, comprising an adjustment module 100 and a fixing module 200, wherein a weld detector is arranged at the upper end of a second adjustment rod 103 in the adjustment module 100, and the fixing module 200 is arranged at the front end of a first adjustment rod 101 in the adjustment module 100. The fixing module 200 can be sleeved on a steel pipe to be inspected, so that the detector can be aligned with the weld of the steel pipe, thereby performing irradiation inspection on the weld.

[0034] Specifically, the adjustment module 100 includes a first adjustment rod 101, the outer surface of the first adjustment rod 101 is slidingly connected to the adjustment block 102, the outer top wall of the adjustment block 102 is rotatably connected to the second adjustment rod 103, and the left and right sides of the adjustment block 102 are symmetrically arranged with clamping assemblies 104. The bottom ends of the two groups of clamping assemblies 104 are transmission-connected to the rotating assembly 105, and the outer side of the rotating assembly 105 is transmission-connected to the clamping assembly 106.

[0035] As shown in Figure 1, the detector is set at the top of the second adjustment rod 103, and the second adjustment rod 103 is rotatably connected to the adjustment block 102, so that the inclination angle of the detector can be adjusted, so that the detection light source can be irradiated into the steel pipe weld from different angles, ensuring that the detection results are more accurate. The adjustment block 102 is slidably connected to the outer surface of the first adjustment rod 101, so that it can drive the detector to move back and forth, adjust the distance between the radiation source and the weld during radiographic detection (i.e., the focal length), accurately determine the focal length and the incident angle of the radiation source, and ensure that the film quality meets the standard requirements.

[0036] Furthermore, the fixing module 200 includes a fixing hoop 201 arranged at the front end of the first adjusting rod 101, and a fixing component 202 is movably installed at the front end of the fixing hoop 201. An arc groove is provided on the inner side of the fixing hoop 201, which is inserted into the outer surface of the steel pipe. After it is limited and fixed by the fixing component 202, the entire device can be installed on the steel pipe, thereby providing a guarantee for subsequent detection work.

[0037] Example 2

[0038] 2 to 8 , a second embodiment of the present invention is shown, which is based on the previous embodiment.

[0039] Specifically, adjustment slots 101a are symmetrically provided on both sides of the first adjustment rod 101, and the clamping assembly 104 includes a clamping plate 104a clamped in the adjustment slot 101a, and a connecting rod 104b is fixedly installed on one end of the clamping plate 104a away from the adjustment slot 101a, and the other end of the connecting rod 104b is fixedly connected to a first telescopic spring 104c, and the bottom end of the connecting rod 104b is fixedly connected to a first sliding rod 104d.

[0040] Among them, a friction pad is provided on the connecting surface between the adjustment groove 101a and the clamping plate 104a, which increases the friction force when the clamping plate 104a is connected to the inner wall of the adjustment groove 101a. Because the clamping assembly 104 is arranged inside the adjustment block 102 and connected thereto, when the clamping plate 104a clamps the first adjustment rod 101, it is difficult for the adjustment block 102 to move forward and backward, thereby ensuring the stability of the detector during detection.

[0041] Furthermore, a movable groove 102a is provided in the middle of the adjustment block 102, and the rotating assembly 105 includes a turntable 105a rotatably connected in the movable groove 102a, and a rotating rod 105b is fixedly installed at the center of the bottom end of the turntable 105a, and the bottom end of the rotating rod 105b passes through the inner bottom wall of the adjustment block 102 and extends to the outside thereof to be fixedly connected to a knob 105c, an elliptical groove 105d is provided at the top of the turntable 105a, and a sliding groove 105e is provided in the middle of the rotating rod 105b.

[0042] As shown in Figures 3 to 5, the staff can drive the rotating rod 105b and the turntable 105a to rotate by turning the knob 105c at the bottom of the adjustment block 102. The turntable 105a is suspended in the movable groove 102a. The opening of the movable groove 102a provides space for the normal rotation of the turntable 105a. The rotating rod 105b is rotatably connected to the inner wall of the adjustment block 102 through a bearing, which not only ensures that the rotating rod 105b rotates more smoothly, but also plays a role in limiting and fixing the rotating rod 105b. With the support of the rotating rod 105b, the turntable 105a is guaranteed not to fall downward.

[0043] Furthermore, contraction grooves 102b are symmetrically opened on the left and right sides of the connection between the adjustment block 102 and the first adjustment rod 101, the clamping plate 104a is arranged in the contraction groove 102b, and the bottom end of the first sliding rod 104d passes through the inner bottom wall of the contraction groove 102b, extends into the movable groove 102a, and is inserted into the elliptical groove 105d.

[0044] The setting of the contraction groove 102b provides storage space for the left and right movement of the clamping plate 104a. When the turntable 105a rotates ninety degrees, the first slide bar 104d can slide from the short axis end of the elliptical groove 105d to the long axis end, so that the first slide bar 104d moves away from the center of the circle, realizing the function of horizontal movement. The first slide bar 104d can drive the connecting rod 104b and the clamping plate 104a away from the adjustment groove 101a, thereby releasing the limit clamping of the first adjustment rod 101, and the staff can smoothly move the adjustment block 102 back and forth to realize the function of adjusting the focal length of the detector and the weld.

[0045] As shown in FIG8 , the slide groove 105e is provided with two parts, namely the first part a1 and the second part a2. The first part a1 is an arc-shaped groove inclined downward, and the second part a2 is a straight groove vertically downward. The bottom end of the first part a1 is connected to the bottom end of the second part a2.

[0046] Furthermore, the clamping assembly 106 includes a second sliding rod 106a slidably connected to the upper end of the first part a1, and the end of the second sliding rod 106a away from the rotating rod 105b is fixedly connected to the clamping rod 106b, the bottom end of the clamping rod 106b is fixedly connected to the return spring 106c, and the left end of the clamping rod 106b is fixedly installed with a toggle plate 106d, and the left end of the toggle plate 106d is set outside the adjustment block 102.

[0047] When the rotating rod 105b rotates ninety degrees, the second sliding rod 106a can slide from the top of the first part a1 of the sliding groove 105e to the bottom end of the first part a1. During the horizontal downward movement of the second sliding rod 106a, it can drive the card rod 106b to move downward. The card rod 106b can squeeze the reset paralysis 106c, and the moment the second sliding rod 106a moves to the bottom end of the first part a1, it loses the obstruction of the side wall of the first part a1, and under the action of the rebound force of the reset paralysis 106c, the card rod 106b can rebound to its initial position, and the card rod 106b can drive the second sliding rod 106a to slide to the top of the second part a2.

[0048] Furthermore, an arc-shaped groove 102c is provided at the bottom end of the movable groove 102a, and a fixed block 105f is fixedly installed at the bottom end of the turntable 105a. The bottom end of the fixed block 105f passes through the movable groove 102a and extends to the arc-shaped groove 102c and is fixedly connected to the arc-shaped block 105g. The arc-shaped block 105g is slidably connected in the arc-shaped groove 102c, and a slot 105h adapted to the clamping rod 106b is provided inside the fixed block 105f and the arc-shaped block 105g. After the clamping rod 106b is inserted into the slot 102c, the fixed block 105f and the arc-shaped block 105g can be limited and fixed, thereby limiting the position of the turntable 105a.

[0049] Preferably, positioning grooves 102d are symmetrically provided on the front and rear sides of the bottom end of the adjustment block 102, and the top ends of the two positioning grooves 102d are connected to the arc groove 102c, the clamping rod 106b is arranged on the upper part of the positioning groove 102d, and the return spring 106c is installed on the lower part of the positioning groove 102d.

[0050] The working principle of this embodiment is:

[0051] When the position of the detector needs to be adjusted, the operator rotates the knob 105c by ninety degrees. The knob 105c can drive the rotating rod 105b and the turntable 105a to rotate ninety degrees. During the rotation of the rotating rod 105b, the second sliding rod 106a can slide from the top of the first part a1 of the sliding groove 105e to the bottom end of the first part a1. During the horizontal downward movement of the second sliding rod 106a, the clamping rod 106b can be driven to move downward. The clamping rod 106b can squeeze the reset paralysis 106c. After the clamping rod 106b moves out of the intersection of the positioning groove 102d and the arc groove 102c, the fixed block 105f and the arc block 105g can be smoothly rotated to the top of the positioning groove 102d without being blocked by the clamping rod 106b. At the same time, after the turntable 105a rotates ninety degrees, it can drive the clamping plate 104a away from the adjusting slot 101a, releasing the clamping fixation of the first adjusting rod 101, and the moment the second sliding bar 106a moves to the bottom end of the first part a1, it loses the obstruction of the side wall of the first part a1 and resets under the action of the rebound force of the paralyzed 106c, which can make the clamping rod 106b rebound to its initial position, so that the clamping rod 106b can be inserted into the clamping slot 105h, and can limit and fix the fixed block 105f and the arc block 105g, thereby limiting the position of the turntable 105a and making the turntable 105a unable to rotate. At this time, the staff can push the adjusting block 102 back and forth to adjust the position of the detector.

[0052] Example 3

[0053] 1 and 9 , there is shown a third embodiment of the present invention, which is based on the first two embodiments.

[0054] Specifically, telescopic grooves 201a are symmetrically provided on the left and right sides of the front end of the fixing hoop 201, and the fixing assembly 202 includes a second telescopic spring 202a respectively installed in the two telescopic grooves 201a, the rear end of the second telescopic spring 202a at the left end is fixedly connected to the movable sleeve 202b, and the rear end of the second telescopic spring 202a at the right end is fixedly connected to the movable plate 202c, and the rear end of the movable plate 202c is provided with a fixed plate 202d, and a positioning plate 202e is fixedly connected between the movable plate 202c and the fixed plate 202d by bolts.

[0055] Among them, the movable sleeve 202b is slidably connected in the telescopic slot 202a at the left end, the movable plate 202c and the fixed plate 202d are slidably connected in the telescopic slot 202a at the right end, the left end of the positioning plate 202e is inserted into the fixed sleeve 202b, and the right end of the positioning plate 202e is set between the movable plate 202c and the fixed plate 202d, and fixed by bolts.

[0056] When in use, first remove the positioning plate 202e, then put the fixing hoop 201 on the steel pipe so that the surface of the steel pipe is in close contact with the inner wall of the fixing hoop 201, and then insert the left end of the positioning plate 202e between the movable plate 202c and the fixed plate 202d, and extend it into the fixing sleeve 202b. At this time, under the joint action of the two second telescopic springs 202a, the positioning plate 202e can be squeezed toward the inside of the fixing hoop 201, so that the positioning plate 202e clamps the other side of the steel pipe, thereby limiting and fixing it.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An auxiliary device for detecting butt welds of small-diameter pipes using a radioactive source, characterized in that: include, The adjustment module (100) comprises a first adjustment rod (101), the outer surface of the first adjustment rod (101) is slidably connected to an adjustment block (102), the outer top wall of the adjustment block (102) is rotatably connected to a second adjustment rod (103), the left and right sides of the adjustment block (102) are symmetrically provided with clamping assemblies (104), the bottom ends of the two groups of clamping assemblies (104) are transmission-connected to a rotating assembly (105), and the outer side of the rotating assembly (105) is transmission-connected to a clamping assembly (106); and, The fixing module (200) comprises a fixing hoop (201) arranged at the front end of the first adjusting rod (101), and a fixing component (202) is movably mounted at the front end of the fixing hoop (201).

2. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 1, characterized in that: The first adjusting rod (101) is symmetrically provided with adjusting grooves (101a) on both sides, and the clamping assembly (104) comprises a clamping plate (104a) clamped in the adjusting groove (101a), and a connecting rod (104b) is fixedly installed at one end of the clamping plate (104a) away from the adjusting groove (101a), and the other end of the connecting rod (104b) is fixedly connected to a first telescopic spring (104c), and the bottom end of the connecting rod (104b) is fixedly connected to a first sliding rod (104d).

3. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 2, characterized in that: The middle of the adjusting block (102) is provided with a movable groove (102a); the rotating assembly (105) comprises a rotating disk (105a) rotatably connected in the movable groove (102a); a rotating rod (105b) is fixedly installed at the center of the bottom end of the rotating disk (105a); the bottom end of the rotating rod (105b) passes through the inner bottom wall of the adjusting block (102) and extends to the outside thereof to be fixedly connected with a knob (105c); an elliptical groove (105d) is provided at the top end of the rotating disk (105a); and a sliding groove (105e) is provided in the middle of the rotating rod (105b).

4. The auxiliary device for detecting a butt weld of a small-diameter pipe with a radioactive source as claimed in claim 3, characterized in that: The slide groove (105e) is provided with two parts, namely a first part (a1) and a second part (a2), and the bottom end of the first part (a1) is connected to the bottom end of the second part (a2).

5. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 4, characterized in that: The clamping assembly (106) includes a second sliding rod (106a) slidably connected in the first part (a1), the end of the second sliding rod (106a) away from the rotating rod (105b) is fixedly connected to a clamping rod (106b), the bottom end of the clamping rod (106b) is fixedly connected to a return spring (106c), the left end of the clamping rod (106b) is fixedly installed with a toggle plate (106d), and the left end of the toggle plate (106d) is arranged outside the adjustment block (102).

6. An auxiliary device for detecting a butt weld of a small-diameter tube for a radioactive source as described in any one of claims 3 to 5, characterized in that: contraction grooves (102b) are symmetrically provided on the left and right sides of the connection between the adjustment block (102) and the first adjustment rod (101), the clamping plate (104a) is arranged in the contraction groove (102b), and the bottom end of the first sliding rod (104d) passes through the inner bottom wall of the contraction groove (102b) and extends into the elliptical groove (105d).

7. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 5, characterized in that: An arc-shaped groove (102c) is provided at the bottom end of the movable groove (102a); a fixed block (105f) is fixedly installed at the bottom end of the rotating disk (105a); the bottom end of the fixed block (105f) passes through the movable groove (102a) and extends into the arc-shaped groove (102c) to be fixedly connected with an arc-shaped block (105g); the arc-shaped block (105g) is slidably connected in the arc-shaped groove (102c).

8. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 7, characterized in that: The fixing block (105f) and the arc block (105g) are provided with a clamping groove (105h) adapted to the clamping rod (106b) inside.

9. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in claim 8, characterized in that: Positioning grooves (102d) are symmetrically provided on the front and rear sides of the bottom of the adjusting block (102), and the top ends of the two positioning grooves (102d) are connected to the arc groove (102c), the clamping rod (106b) is arranged on the upper part of the positioning groove (102d), and the return spring (106c) is installed on the lower part of the positioning groove (102d).

10. The auxiliary device for detecting the butt weld of a small-diameter pipe with a radioactive source as claimed in any one of claims 1 to 5, characterized in that: Telescopic grooves (201a) are symmetrically arranged on the left and right sides of the front end of the fixing hoop (201); the fixing assembly (202) comprises second telescopic springs (202a) respectively installed in the two telescopic grooves (201a); the rear end of the second telescopic spring (202a) at the left end is fixedly connected to a moving sleeve (202b); the rear end of the second telescopic spring (202a) at the right end is fixedly connected to a moving plate (202c); a fixing plate (202d) is arranged at the rear end of the moving plate (202c); a positioning plate (202e) is fixedly connected between the moving plate (202c) and the fixing plate (202d) by bolts.

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