Weld joint flaw detection auxiliary device

Abstract

The utility model provides an auxiliary device for weld flaw detection, which relates to the technical field of flaw detection equipment and comprises a fixing frame, a first telescopic rod, a second telescopic rod and a flaw detector, the flaw detector is used for detecting a weld between a conical connecting pipe and a conical top cover, the fixing frame is used for moving along the circumferential direction of the conical connecting pipe, and one end of the first telescopic rod is connected with the fixing frame. One end of the second telescopic rod is connected with the end, away from the fixing frame, of the first telescopic rod, the other end of the second telescopic rod is connected with the flaw detector, the second telescopic rod is used for stretching out and drawing back in the second direction, and a preset angle is formed between the second direction and the first direction. The fixing frame can move in the circumferential direction of the conical surface connecting pipe to adjust the position of the welding seam flaw detection auxiliary device, the first telescopic rod stretches out and draws back in the first direction, the second telescopic rod stretches out and draws back in the second direction to drive the flaw detector to move, the position of the flaw detector is adjusted in different directions, it is ensured that the flaw detector can detect flaws in all directions, and the flaw detection efficiency is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flaw detection device technical field, specifically, a kind of welding seam flaw detection auxiliary device. BACKGROUND

[0002] Nuclear power generation process needs to use reactor, reaction fuel inside reactor will produce a large amount of heat in the process of reaction, in order to ensure the safe progress of reaction, heat exchanger and cooling circulating pump are usually used to transfer heat. Since cooling circulating pump and heat exchanger and other devices are usually installed on the cone top cover of nuclear reactor through taper face connection pipe, and the weld of the taper surface of the cone top cover and the taper face connection pipe is a relatively vertical inclined annular weld, the high-low point of the weld has large difference, the operator needs to hold flaw detector and move frequently to carry out flaw detection of the weld, and the detection efficiency is low. UTILITY MODEL CONTENTS

[0003] The utility model aims at solving the technical problem of low detection efficiency of the weld between the taper face connection pipe and the cone top cover.

[0004] The utility model provides a kind of welding seam flaw detection auxiliary device, including fixed frame, first telescopic rod, second telescopic rod and flaw detector, the flaw detector is used to detect the weld between taper face connection pipe and cone top cover, the fixed frame is used to move along the circumference of taper face connection pipe, one end of the first telescopic rod is connected with the fixed frame, and the first telescopic rod is used to stretch out and shrink along first direction, one end of the second telescopic rod is connected with the end of the first telescopic rod away from the fixed frame, the other end of the second telescopic rod is connected with the flaw detector, the second telescopic rod is used to stretch out and shrink along second direction, the second direction is set at preset angle with the first direction.

[0005] Optionally, the first direction is parallel to the axial direction of the taper face connection pipe, and the second direction is the radial direction of the taper face connection pipe.

[0006] Optionally, the fixed frame is used to be set at the end of the taper face connection pipe away from the cone top cover, the fixed frame includes first fixed rod, second fixed rod, first support rod and second support rod, the first fixed rod and the second fixed rod are arranged in parallel and both extend along the radial direction of the taper face connection pipe, the first fixed rod is used to be located outside the taper face connection pipe, and one end of the first fixed rod protrudes from the circumferential edge of the taper face connection pipe and is connected with the first support rod, the first support rod is used to contact with the outer circumferential wall of the taper face connection pipe, the second fixed rod is used to be located inside the taper face connection pipe, one end of the second support rod is movably connected with the second fixed rod, and the other end of the second support rod is used to contact with the inner circumferential wall of the taper face connection pipe.

[0007] Optionally, the fixing frame further comprises connecting rods, two first fixing rods and two second fixing rods are provided respectively, and the two first fixing rods and the two second fixing rods are provided correspondingly, and the connecting rods are arranged between the two first fixing rods and / or between the two second fixing rods and / or between the first fixing rod and the second fixing rod.

[0008] Optionally, the fixing frame further comprises a first roller and a second roller, the first roller is connected with the first supporting rod and used for rolling along the outer peripheral wall of the taper connecting pipe, and the second roller is connected with the second supporting rod and used for rolling along the inner peripheral wall of the taper connecting pipe.

[0009] Optionally, the fixing frame further comprises a third roller, the third roller is connected with the first fixing rod and used for rolling along the corresponding end face of the taper connecting pipe.

[0010] Optionally, the contact point of the first supporting rod with the outer peripheral wall of the taper connecting pipe is a first contact point, the contact point of the second supporting rod with the inner peripheral wall of the taper connecting pipe is a second contact point, and the first contact point and the second contact point are located at different heights.

[0011] Optionally, the welding seam flaw detection auxiliary device further comprises a first locking handle, the fixed part of the first telescopic rod is fixedly connected with at least one of the first fixing rod, the second fixing rod and the connecting rod, and the first locking handle is used for locking the movable part of the first telescopic rod with the fixed part of the first telescopic rod after the first telescopic rod is telescoped in place.

[0012] And / or, the welding seam flaw detection auxiliary device further comprises a second locking handle, the fixed part of the second telescopic rod is fixedly connected with the movable part of the first telescopic rod, the movable part of the second telescopic rod is connected with the flaw detector, and the second locking handle is used for locking the movable part of the second telescopic rod with the fixed part of the second telescopic rod after the second telescopic rod is telescoped in place.

[0013] And / or, the welding seam flaw detection auxiliary device further comprises a third locking handle, one end of the second supporting rod is inserted into the inside of the second fixing rod, and the third locking handle is used for locking the second fixing rod with the second supporting rod after the second supporting rod is moved in place relative to the second fixing rod.

[0014] Optionally, the flaw detector is a radiographic flaw detector.

[0015] Optionally, the welding seam flaw detection auxiliary device further comprises a fourth locking handle, one end of the second telescopic rod away from the first telescopic rod is provided with a fixed sleeve, the flaw detector is arranged in the fixed sleeve and locked by the fourth locking handle.

[0016] The welding seam flaw detection auxiliary device has at least the following advantages compared with the prior art.

[0017] When the welding seam of a certain conical connecting pipe and a conical top cover needs to be detected, the fixing frame of the welding seam flaw detection auxiliary device can be installed on the conical connecting pipe, then the fixing frame can be moved along the circumference of the conical connecting pipe to adjust the position of the welding seam flaw detection auxiliary device, and the first telescopic rod is telescoped in the first direction and the second telescopic rod is telescoped in the second direction to drive the flaw detector to move, so that the position of the flaw detector is adjusted from different directions, and the flaw detector can smoothly detect the annular welding seam of the conical connecting pipe and the conical top cover in all directions, and the flaw detection efficiency is higher. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic view of the welding seam flaw detection auxiliary device of the embodiment of the utility model;

[0019] Figure 2 The figure is an installation structural schematic view of the welding seam flaw detection auxiliary device and the conical connecting pipe of the embodiment of the utility model;

[0020] Figure 3 The figure is Figure 2 The figure is an enlarged schematic view of position A in the figure;

[0021] Figure 4 The figure is Figure 2 The figure is an enlarged schematic view of position B in the figure;

[0022] Figure 5 The figure is an installation structural schematic view of the conical connecting pipe and the conical top cover of the embodiment of the utility model.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, fixing frame; 11, first fixed rod; 12, second fixed rod; 13, first support rod; 14, second support rod; 15, connecting rod; 16, first roller; 17, second roller; 18, third roller; 2, first telescopic rod; 3, second telescopic rod; 31, fixed sleeve; 4, flaw detector; 5, first locking handle; 6, second locking handle; 7, third locking handle; 8, fourth locking handle; 9, conical connecting pipe; 91, annular flange; 10, conical top cover; 101, transition connecting pipe. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0026] In the description of the utility model, unless another definite provision and limitation, the term "installation", "link", "connection", "fitting" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can indirectly connect through the intermediate medium, can be two element internal communication. For the person skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0027] In addition, it should be noted that in the description of the utility model, it should be explained that the terms in the embodiments such as "upper", "lower", "front", "rear" and the like indicate the position of the words, only for the position relationship based on the description of the drawings, and do not represent the elements and devices indicated must be operated according to the specific position and the defined operation and method, structure, and the like, the position of the such position terms does not constitute the restriction of the utility model.

[0028] This paper establishes XYZ coordinate system. Wherein, Z axis indicates up-down direction, Z axis positive direction indicates upper, Z axis reverse direction indicates lower. It should be noted that the aforementioned Z axis meaning is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a restriction on the utility model.

[0029] As shown in Figures 1-2 The utility model discloses a weld flaw detection auxiliary device, including fixed frame 1, first telescopic link 2, second telescopic link 3 and flaw detector 4, the flaw detector 4 is used for detecting the weld between the taper face pipe 9 and the taper top cover 10, the fixed frame 1 is used for moving along the circumference of the taper face pipe 9, one end of the first telescopic link 2 is connected with the fixed frame 1, and the first telescopic link 2 is used for telescoping along the first direction, one end of the second telescopic link 3 is connected with the one end of the first telescopic link 2 away from the fixed frame 1, the other end of the second telescopic link 3 is connected with the flaw detector 4, the second telescopic link 3 is used for telescoping along the second direction, and the second direction is arranged at the preset angle with the first direction.

[0030] Specifically, as shown in Figure 5As shown, the conical top cover 10 is a small upper and large lower conical structure, and the axis thereof is in the direction shown by the Z axis. The conical top cover 10 is provided with a plurality of mounting holes on the conical surface, which can be connected with corresponding conical surface connecting pipes 9. The conical surface connecting pipe 9 can be used to support devices such as pumps and heat exchangers. The conical surface connecting pipe 9 is vertically arranged, and the lower end of the conical surface connecting pipe 9 is a bevel surface matched with the conical surface of the conical top cover 10. The weld between the conical surface connecting pipe 9 and the conical top cover 10 is an annular weld inclined relative to the Z axis. In addition to being directly connected with the conical top cover 10, the conical surface connecting pipe 9 can also be connected with the conical top cover 10 through a transition connecting pipe 101. If the conical surface connecting pipe 9 is connected with the conical top cover 10 through the transition connecting pipe 101, the flaw detector 4 needs to separately detect the weld between the conical surface connecting pipe 9 and the transition connecting pipe 101, and the weld between the transition connecting pipe 101 and the conical top cover 10, that is, two annular welds.

[0031] The fixing frame 1 can be of any shape and can be connected with the pipe wall of the conical surface connecting pipe 9 to fix the flaw detector 4 to the conical surface connecting pipe 9. The fixing frame 1 can be manually pushed or electrically driven to move along the circumference of the conical surface connecting pipe 9. The first telescopic rod 2 and the second telescopic rod 3 can be directly used as existing telescopic rods, including fixed parts and movable parts that are sleeved with each other. The setting direction of the first telescopic rod 2 and the second telescopic rod 3 can be flexibly set according to needs. The flaw detector 4 can be used to detect whether the weld has cracks, inclusions, incomplete penetration and other welding defects.

[0032] In the embodiment, when the weld between a certain conical surface connecting pipe 9 and the conical top cover 10 needs to be detected, the fixing frame 1 of the weld detection auxiliary device is installed on the conical surface connecting pipe 9. Then, the fixing frame 1 is used to move along the circumference of the conical surface connecting pipe 9 to adjust the position of the weld detection auxiliary device. The first telescopic rod 2 is used to stretch and retract in the first direction, and the second telescopic rod 3 is used to stretch and retract in the second direction to drive the flaw detector 4 to move, so as to adjust the position of the flaw detector 4 from different directions. This ensures that the flaw detector 4 can smoothly detect the annular weld between the conical surface connecting pipe 9 and the conical top cover 10 in all directions, and the detection efficiency is higher.

[0033] As shown in the Figure 2 Optionally, the first direction is parallel to the axis direction of the conical surface connecting pipe 9, and the second direction is the radial direction of the conical surface connecting pipe 9.

[0034] Specifically, the first direction is parallel to the axis direction of the conical surface connecting pipe 9, that is, the direction shown by the Z axis. The first telescopic rod 2 stretches and retracts in the first direction, that is, in the direction shown by the Z axis, to adjust the height position of the flaw detector 4. The second direction is the radial direction of the conical surface connecting pipe 9, that is, the second telescopic rod 3 can stretch and retract in the XY plane to adjust the radial position of the flaw detector 4 relative to the conical surface connecting pipe 9. In this way, the position of the flaw detector 4 is adjusted from different directions. The movement of the flaw detector 4 is more flexible and can meet the needs of detection in different directions.

[0035] Optionally, the fixing frame 1 is disposed at the end of the conical nozzle 9 away from the conical top cover 10. The fixing frame 1 includes a first fixing rod 11, a second fixing rod 12, a first support rod 13, and a second support rod 14. The first fixing rod 11 and the second fixing rod 12 are arranged parallel to each other and both extend radially along the conical nozzle 9. The first fixing rod 11 is located outside the conical nozzle 9, and one end of the first fixing rod 11 extends out of the circumferential edge of the conical nozzle 9 and is connected to the first support rod 13. The first support rod 13 is used to contact the outer peripheral wall of the conical nozzle 9. The second fixing rod 12 is located inside the conical nozzle 9. One end of the second support rod 14 is movably connected to the second fixing rod 12, and the other end of the second support rod 14 is used to contact the inner peripheral wall of the conical nozzle 9.

[0036] Specifically, taking the first fixing rod 11 and the second fixing rod 12 extending along the X-axis as an example, the first fixing rod 11 and the second fixing rod 12 are spaced apart along the Z-axis. The first fixing rod 11 is located above the conical tube 9. One end of the first fixing rod 11 extends out of the circumferential edge of the conical tube 9 along the negative X-axis and is connected to the downwardly extending first support rod 13. The second fixing rod 12 is located inside the conical tube 9, and one end of the second fixing rod 12 along the negative X-axis is connected to the second support rod 14. The second support rod 14 can move relative to the second fixing rod 12 along the X-axis.

[0037] In this embodiment, with the first support rod 13 in contact with the outer peripheral wall of the conical tube 9, the second support rod 14 can move relative to the second fixing rod 12 in the direction shown by the X-axis so that it contacts the inner peripheral wall of the conical tube 9. This achieves the clamping of the conical tube 9 between the first support rod 13 and the second support rod 14, or in other words, the fixing frame 1 is fixed on the conical tube 9. The fixing method is simple, and the fixing frame 1 contacts the inner and outer peripheral walls of the conical tube 9 respectively, resulting in good fixing stability.

[0038] like Figure 3 As shown, optionally, the fixing frame 1 further includes a connecting rod 15. Two first fixing rods 11 and two second fixing rods 12 are provided respectively, and the two first fixing rods 11 and two second fixing rods 12 are respectively provided correspondingly. The connecting rod 15 is provided between the two first fixing rods 11 and / or between the two second fixing rods 12 and / or between the first fixing rod 11 and the second fixing rod 12.

[0039] Specifically, two first fixed rods 11 are arranged along the direction indicated by the Y axis, and two second fixed rods 12 are arranged along the direction indicated by the Y axis, and each first fixed rod 11 corresponds to one second fixed rod 12 below. The connecting rods 15 can be arranged in different directions. The two first fixed rods 11 are connected by a connecting rod 15 extending along the direction indicated by the Y axis at one end along the positive direction of the X axis, and the two fixed rods are connected by a connecting rod 15 extending along the direction indicated by the Y axis at one end along the negative direction of the X axis. The two second fixed rods 12 are connected by a connecting rod 15 extending along the direction indicated by the Y axis at one end along the positive direction of the X axis, and the two second fixed rods 12 are connected by a connecting rod 15 extending along the direction indicated by the Y axis at one end along the negative direction of the X axis. The connecting rod 15 extending along the direction indicated by the Z axis is connected between the one end along the positive direction of the X axis of the second fixed rod 12 and the corresponding first fixed rod 11, and the connecting rod 15 extending along the direction indicated by the Z axis is connected between the one end along the negative direction of the X axis of the second fixed rod 12 and the corresponding first fixed rod 11.

[0040] In this embodiment, the first fixed rod 11, the second fixed rod 12, and the connecting rod 15 arranged horizontally and vertically can form an L-shaped frame structure to ensure the stability of the fixing frame 1. The first telescopic rod 2 can be connected to the frame structure.

[0041] As shown in Figure 3 Optionally, the fixing frame 1 further comprises a first roller 16 and a second roller 17. The first roller 16 is connected to the first support rod 13 and used to roll along the outer peripheral wall of the taper connecting pipe 9. The second roller 17 is connected to the second support rod 14 and used to roll along the inner peripheral wall of the taper connecting pipe 9.

[0042] In this embodiment, the axes of the first roller 16 and the second roller 17 can be arranged along the direction indicated by the Z axis. The first roller 16 is arranged at the end of the first support rod 13 in contact with the outer peripheral wall of the taper connecting pipe 9, and the second roller 17 is arranged at the end of the second support rod 14 in contact with the inner peripheral wall of the taper connecting pipe 9. In this way, the first support rod 13 can be in contact with the outer peripheral wall of the taper connecting pipe 9 through the first roller 16, the end of the second support rod 14 away from the second fixed rod 12 can be connected to the second roller 17, and the second support rod 14 can be in contact with the inner peripheral wall of the taper connecting pipe 9 through the second roller 17. The fixing frame 1 can move along the circumference of the taper connecting pipe 9 more conveniently through the first roller 16 and the second roller 17, the moving resistance is smaller, or in other words, only a small driving force along the circumference of the taper connecting pipe 9 needs to be applied to the fixing frame 1 to drive the fixing frame 1 to move.

[0043] As shown in Figure 3 Optionally, the fixing frame 1 further comprises a third roller 18. The third roller 18 is connected to the first fixed rod 11 and used to roll along the corresponding end surface of the taper connecting pipe 9.

[0044] Specifically, the upper end surface of the conical connecting pipe 9 is provided with an annular flange 91 extending radially outwardly along the conical connecting pipe 9, and the first fixing rod 11 is provided with one or more third rollers 18 at a position corresponding to the annular flange 91. By providing the annular flange 91, the third roller 18 can be better supported, and the third roller 18 can be smoothly moved on the upper end surface of the conical connecting pipe 9, avoiding the situation that the third roller 18 cannot be smoothly moved on the upper end surface of the conical connecting pipe 9 due to the excessively thin wall of the conical connecting pipe 9.

[0045] In the embodiment, the first support rod 13 is in contact with the outer peripheral wall of the conical connecting pipe 9 through the first roller 16, and the second support rod 14 is in contact with the inner peripheral wall of the conical connecting pipe 9 through the second roller 17, and the third roller 18 is arranged on the first fixing rod 11 at a position corresponding to the upper end surface of the conical connecting pipe 9, which can further improve the smoothness of the movement of the fixing frame 1 along the circumference of the conical connecting pipe 9.

[0046] Optionally, the contact point of the first support rod 13 with the outer peripheral wall of the conical connecting pipe 9 is a first contact point, the contact point of the second support rod 14 with the inner peripheral wall of the conical connecting pipe 9 is a second contact point, and the first contact point and the second contact point are located at different heights.

[0047] In the embodiment, the contact point of the first roller 16 on the first support rod 13 with the outer peripheral wall of the conical connecting pipe 9, the contact point of the second roller 17 on the second support rod 14 with the inner peripheral wall of the conical connecting pipe 9, and the contact point of the third roller 18 on the first fixing rod 11 with the upper end surface of the conical connecting pipe 9 are arranged in a triangular shape and are located at different heights, so that the stress of each part of the fixing frame 1 is more uniform, and the stability of the installation of the fixing frame 1 on the conical connecting pipe 9 is ensured.

[0048] As shown in Figures 1-3 Optionally, the weld flaw detection auxiliary device further comprises a first locking handle 5, the fixed part of the first telescopic rod 2 is fixedly connected with at least one of the first fixing rod 11, the second fixing rod 12 and the connecting rod 15, and the first locking handle 5 is used to lock the movable part of the first telescopic rod 2 with the fixed part of the first telescopic rod 2 after the first telescopic rod 2 is telescoped in place.

[0049] And / or, the weld flaw detection auxiliary device further comprises a second locking handle 6, the fixed part of the second telescopic rod 3 is fixedly connected with the movable part of the first telescopic rod 2, the movable part of the second telescopic rod 3 is connected with the flaw detector 4, and the second locking handle 6 is used to lock the movable part of the second telescopic rod 3 with the fixed part of the second telescopic rod 3 after the second telescopic rod 3 is telescoped in place.

[0050] And / or, the welding seam flaw detection auxiliary device further comprises a third locking handle 7, one end of the second support rod 14 is inserted into the inside of the second fixed rod 12, and the third locking handle 7 is used to lock the second fixed rod 12 and the second support rod 14 after the second support rod 14 is moved into position relative to the second fixed rod 12.

[0051] In the embodiment, the first locking handle 5 can be an L-shaped handle, at least one of the fixed part and the movable part of the first telescopic rod 2 is provided with a plurality of first connecting holes arranged at intervals along the extension direction thereof, and the other is provided with a second connecting hole, after the movable part of the first telescopic rod 2 is moved into position relative to the fixed part, one end of the first locking handle 5 can pass through the corresponding first connecting hole and the second connecting hole to lock the fixed part and the movable part of the first telescopic rod 2, and the other end of the first locking handle 5 can form a hand holding part to facilitate the operator to hold. The first locking handle 5 can be provided with a plurality of locking handles to ensure the locking stability.

[0052] The installation and use of the second locking handle 6 and the third locking handle 7 are similar to those of the first locking handle 5, and will not be repeated.

[0053] Optionally, the flaw detector 4 is a radiographic flaw detector. Compared with other types of flaw detectors 4, the use of X-ray or γ-ray to internally inspect the welding seam can effectively monitor whether the welding seam has defects such as pores and inclusions, and can generate images to visually display the internal structure of the welding seam, facilitating the analysis and evaluation of the nature and position of the defects; in addition, there is no need to directly contact the welding seam, reducing the risk of damage to the conical surface connecting pipe 9 and the conical top cover 10.

[0054] As shown in Figure 4 Optionally, the welding seam flaw detection auxiliary device further comprises a fourth locking handle 8, one end of the second telescopic rod 3 away from the first telescopic rod 2 is provided with a fixed sleeve 31, and the flaw detector 4 is placed in the fixed sleeve 31 and locked by the fourth locking handle 8.

[0055] Specifically, the flaw detector 4 can be tubular, the end of the second telescopic rod 3 away from the first telescopic rod 2 is provided with a fixed sleeve 31, the inner wall shape of the fixed sleeve 31 matches the outer shape of the flaw detector 4, after the flaw detector 4 is placed in the fixed sleeve 31, the flaw detector 4 and the fixed sleeve 31 are locked by the fourth locking handle 8 to realize the fixed installation of the flaw detector 4 on the second telescopic rod 3, and the installation method is simple. The installation and use of the fourth locking handle 8 are similar to those of the first locking handle 5, the second locking handle 6 and the third locking handle 7, and will not be repeated.

[0056] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A weld flaw detection aid, characterized by, The utility model relates to a kind of fixed frame (1), first telescopic rod (2), second telescopic rod (3) and flaw detector (4), the flaw detector (4) is used to detect the weld between conical pipe (9) and cone top cover (10), the fixed frame (1) is used to move along the circumference of the conical pipe (9), one end of the first telescopic rod (2) is connected with the fixed frame (1), and the first telescopic rod (2) is used to be telescopic along first direction, one end of the second telescopic rod (3) is connected with the first telescopic rod (2) away from the fixed frame (1), the other end of the second telescopic rod (3) is connected with the flaw detector (4), and the second telescopic rod (3) is used to be telescopic along second direction, and the second direction is set with the first direction at preset angle.

2. The weld flaw detection aid of claim 1, wherein, The first direction is parallel to the axial direction of the conical pipe (9), and the second direction is the radial direction of the conical pipe (9).

3. The weld flaw detection aid of claim 1, wherein, The fixed frame (1) is used to be arranged at the end of the conical pipe (9) away from the cone top cover (10), and the fixed frame (1) includes first fixed rod (11), second fixed rod (12), first support rod (13) and second support rod (14). The first fixed rod (11) and the second fixed rod (12) are arranged in parallel opposite and both extend along the radial direction of the conical pipe (9). The first fixed rod (11) is located outside the conical pipe (9), and one end of the first fixed rod (11) extends beyond the circumferential edge of the conical pipe (9) and is connected with the first support rod (13). The first support rod (13) is used to contact the outer peripheral wall of the conical pipe (9). The second fixed rod (12) is located inside the conical pipe (9), and one end of the second support rod (14) is movably connected with the second fixed rod (12). The other end of the second support rod (14) is used to contact the inner peripheral wall of the conical pipe (9).

4. The weld flaw detection aid of claim 3, wherein, The fixed frame (1) further includes a connecting rod (15). The first fixed rod (11) and the second fixed rod (12) are respectively provided with two connecting rods (15). The two first fixed rods (11) and / or the two second fixed rods (12) and / or the first fixed rod (11) and the second fixed rod (12) are provided with the connecting rod (15).

5. The weld flaw detection aid of claim 3, wherein, The fixed frame (1) further includes a first roller (16) and a second roller (17). The first roller (16) is connected with the first support rod (13) and is used to roll along the outer peripheral wall of the conical pipe (9). The second roller (17) is connected with the second support rod (14) and is used to roll along the inner peripheral wall of the conical pipe (9).

6. The weld flaw detection aid of claim 3, wherein, The fixed frame (1) further includes a third roller (18). The third roller (18) is connected with the first fixed rod (11) and is used to roll along the corresponding end surface of the conical pipe (9).

7. The weld flaw detection aid of claim 3, wherein, The contact point of the first support rod (13) with the outer peripheral wall of the taper surface connecting pipe (9) is a first contact point, and the contact point of the second support rod (14) with the inner peripheral wall of the taper surface connecting pipe (9) is a second contact point, the first contact point and the second contact point are located at different heights.

8. The weld flaw detection aid of claim 4, wherein, Further comprising a first locking handle (5), the fixed part of the first telescopic rod (2) is fixedly connected with at least one of the first fixed rod (11), the second fixed rod (12) and the connecting rod (15), the first locking handle (5) is used to lock the movable part of the first telescopic rod (2) and the fixed part of the first telescopic rod (2) after the first telescopic rod (2) is telescoped in place; And / or further comprising a second locking handle (6), the fixed part of the second telescopic rod (3) is fixedly connected with the movable part of the first telescopic rod (2), the movable part of the second telescopic rod (3) is connected with the flaw detector (4), the second locking handle (6) is used to lock the movable part of the second telescopic rod (3) and the fixed part of the second telescopic rod (3) after the second telescopic rod (3) is telescoped in place; And / or further comprising a third locking handle (7), one end of the second support rod (14) is inserted into the inside of the second fixed rod (12), the third locking handle (7) is used to lock the second fixed rod (12) and the second support rod (14) after the second support rod (14) is moved in place relative to the second fixed rod (12).

9. The weld flaw detection aid of claim 1, wherein, The flaw detector (4) is a radiographic flaw detector.

10. The weld flaw detection aid of claim 1, wherein, Further comprising a fourth locking handle (8), one end of the second telescopic rod (3) away from the first telescopic rod (2) is provided with a fixed sleeve (31), the flaw detector (4) is placed in the fixed sleeve (31) and locked by the fourth locking handle (8). Further comprising a fourth locking handle (8), one end of the second telescopic rod (3) away from the first telescopic rod (2) is provided with a fixed sleeve (31), the flaw detector (4) is placed in the fixed sleeve (31) and locked by the fourth locking handle (8).

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