CN-121994918-A - Ultrasonic detection device and detection method for weld joint of radiating fin

CN121994918ACN 121994918 ACN121994918 ACN 121994918ACN-121994918-A

Abstract

The application provides an ultrasonic detection device and method for welding seams of radiating fins. The ultrasonic detection device for the weld joint of the radiating fin comprises a frame body, a connecting mechanism and an elastic mechanism, wherein the connecting mechanism is connected with the frame body through the elastic mechanism, the connecting mechanism can reciprocate along a first direction through the elastic mechanism, an ultrasonic detection wheel is used for detecting the weld joint of a welding piece of the radiating fin, the ultrasonic detection wheel is rotationally connected with the connecting mechanism so that the ultrasonic detection wheel can rotate by taking the connecting mechanism as a central shaft, an auxiliary wheel and the ultrasonic detection wheel are oppositely arranged along the first direction and rotationally connected with the frame body, the ultrasonic detection wheel and the auxiliary wheel are arranged on two sides of the welding piece of the radiating fin and synchronously roll along the surface of the welding piece of the radiating fin, and under the action of the elastic mechanism, a first interval between a first peripheral surface of the ultrasonic detection wheel and a second peripheral surface of the auxiliary wheel can be adjusted according to the thickness of the welding piece of the radiating fin, and in an initial state, the first interval is not larger than the thickness dimension of the welding piece of the radiating fin.

Inventors

JI CHANGGUO
WANG JIANGUO
ZHANG PENGKUN
SONG ZIBO
TIAN BO
ZANG MENGLU
LI MENGYU
YU KUICAI
Xue Shaoxin
HAN ZHEWEN

Assignees

华北电力科学研究院有限责任公司
国网冀北电力有限公司电力科学研究院
国网冀北电力有限公司
国家电网有限公司

Dates

Publication Date: 20260508
Application Date: 20251225

Claims (10)

1. An ultrasonic fin weld inspection device, comprising: A frame body; The connecting mechanism is connected with the frame main body through the elastic mechanism, and can reciprocate along a first direction through the elastic mechanism; The ultrasonic detection wheel is used for detecting welding lines of the radiating fin weldment and is rotationally connected with the connecting mechanism so that the ultrasonic detection wheel can rotate by taking the connecting mechanism as a central shaft; The auxiliary wheel and the ultrasonic detection wheel are oppositely arranged along the first direction and are rotationally connected with the frame main body, and the ultrasonic detection wheel and the auxiliary wheel can be symmetrically arranged on two sides of the thickness direction of the radiating fin weldment and synchronously roll along the surface of the radiating fin weldment; Under the action of the elastic mechanism, a first distance between the first peripheral surface of the ultrasonic detection wheel and the second peripheral surface of the auxiliary wheel can be adjusted according to the thickness of the radiating fin welding piece, and in an initial state, the first distance is not larger than the thickness dimension of the radiating fin welding piece.
2. The ultrasonic fin weld inspection device of claim 1, wherein, The second peripheral surface of the auxiliary wheel is provided with a magnetic layer or an adhesive layer, and the auxiliary wheel is capable of generating an adhesive force in a state of being in contact with the surface of the fin weldment.
3. The ultrasonic fin weld inspection device of claim 1, wherein, The elastic mechanism comprises a pair of elastic pieces and a guide structure, the guide structure is arranged along the first direction, and the pair of elastic pieces are oppositely arranged at two sides of the guide structure; The connecting mechanism is a columnar structure arranged along a second direction, the ultrasonic detection wheel is sleeved on the periphery of the connecting mechanism, a pair of elastic pieces are symmetrically arranged on two sides of the ultrasonic detection wheel along the length direction of the connecting mechanism, and the connecting mechanism is in sliding connection with the guide structure along the first direction; the first direction and the second direction are vertically arranged.
4. The ultrasonic fin weld inspection device of claim 1, wherein, The ultrasonic detection wheel comprises a wheel body, a piezoelectric wafer and a signal transmission device, wherein the wheel body is rotationally connected with the connecting mechanism, the piezoelectric wafer is circumferentially arranged along the circumferential direction of the wheel body, and one surface of the piezoelectric wafer, which is opposite to the wheel body, forms the first peripheral surface; The piezoelectric wafer is electrically connected with the signal transmission device, so that the piezoelectric wafer can receive or send detection signals with the ultrasonic detector through the signal transmission device.
5. The ultrasonic fin weld inspection device of claim 4, wherein, The ultrasonic detection wheel also comprises a damping block and a protective film, the wheel body is of a shell structure, the shell structure and the connecting mechanism form a cavity, and the damping block is arranged in the cavity and fixedly connected with the wheel body; The protective film surrounds the first outer peripheral surface of the piezoelectric wafer, and the piezoelectric wafer is clamped between the damping block and the protective film.
6. The ultrasonic fin weld detection apparatus of claim 5, wherein the signal transmission means comprises: the rotating piece is arranged in the cavity and fixedly connected with the wheel body, and is sleeved on the periphery of the connecting mechanism; The conductive slip ring is arranged on the side wall of the connecting mechanism, an annular groove is formed in the surface, facing the connecting mechanism, of the rotating piece, an arc-shaped protruding part is arranged in the cavity, and the rotating piece covers the conductive slip ring and is connected with the arc-shaped protruding part in a matched mode through the annular groove, so that the rotating piece can rotate relative to the conductive slip ring; The first lead is positioned in the cavity, the rotating piece is provided with a threading channel in a penetrating way along the radial direction of the rotating piece, the threading channel is communicated with the annular groove, one end of the first lead is connected with the piezoelectric wafer, and the other end of the first lead penetrates through the threading channel to be connected with the arc-shaped protruding part in a sliding contact way; The connecting mechanism is of a hollow tubular structure, the conductive slip ring penetrates through the side wall of the connecting mechanism, an outlet is formed in one end of the connecting mechanism along the length direction of the connecting mechanism, one end of the second wire stretches into the connecting mechanism and is connected with the conductive slip ring, and the other end of the second wire stretches out of the connecting mechanism through the outlet and is used for being in communication connection with the ultrasonic detector.
7. The fin weld ultrasonic detection apparatus of claim 1, further comprising: The handle, the frame main part has the installation space, ultrasonic detection wheel with the auxiliary wheel set up in the installation space, the handle set up in the frame main part dorsad one side in installation space.
8. A method of inspection employing the fin weld ultrasonic inspection apparatus of any one of claims 1-7, comprising: Connecting a radiating fin welding seam ultrasonic detection device with an ultrasonic detector, setting the scanning proportion of the ultrasonic detector to be 1:1, and covering the thickness of the radiating fin by at least 2 times in the detection range; setting detection sensitivity by taking an artificial reflector echo or bottom wave with the depth of 2 times of the thickness of the radiating fin as a reference signal; Placing the radiating fin welding seam ultrasonic detection device on a radiating fin welding piece, aligning an ultrasonic detection wheel with the welding seam width of the radiating fin welding piece, and enabling the ultrasonic detection wheel to be in contact with the surface of the radiating fin welding piece; Pushing the radiating fin welding seam ultrasonic detection device to roll along the length direction of the welding seam of the radiating fin welding piece; And judging defects by using the change of the artificial reflector echo or the bottom wave signal at the position with the depth of 2 times of the thickness of the radiating fin, and judging that unqualified defects exist in the welding line if the amplitude of the artificial reflector echo or the bottom wave signal is reduced or eliminated compared with that of the reference signal.
9. The method according to claim 8, wherein, The setting of the detection sensitivity includes: selecting artificial reflector with depth covered by at least 2 times of fin thickness on the carbon steel reference block, making distance-amplitude curve, and raising 6dB, or, And arranging the radiating fin welding seam ultrasonic detection device in a welding seam quality qualified area of the radiating fin welding piece, aligning an ultrasonic detection wheel with the welding seam width of the radiating fin welding piece, reciprocating the ultrasonic detection wheel for at least one circle, and adjusting the average amplitude of a bottom wave signal with the depth of 2 times of the thickness of the radiating fin to 80% of the full scale of a display screen of the ultrasonic detector, thereby improving the frequency by 6dB.
10. The method of claim 9, wherein, The method for judging the defect by the change of the echo or bottom wave signal of the artificial reflector at the depth of 2 times of the thickness of the radiating fin comprises the following steps: If the amplitude of the artificial reflector echo at the depth of 2 times of the thickness of the radiating fin is lower than the corresponding height according to the distance-amplitude curve, judging that the welding line has unqualified defects, or, And if the amplitude of the bottom wave signal at the position with the depth of 2 times of the thickness of the radiating fin is lower than 40% of the full scale of the display screen, or the bottom wave signal completely disappears, judging that the welding seam has an unqualified defect.

Description

Ultrasonic detection device and detection method for weld joint of radiating fin Technical Field The application relates to the technical field of weld joint detection, in particular to an ultrasonic detection device and method for weld joints of radiating fins. Background The radiating fins are key components of the cooling system of the oil immersed transformer and the reactor, and radiate operating heat through natural convection or forced air cooling to maintain the safe temperature of the equipment. The structure of the oil tank consists of an upper oil collecting pipe, a lower oil collecting pipe and a middle corrugated radiating fin, hot oil enters from the top, and flows back to the oil tank from the bottom after cooling. The radiating fin is made of a thin-wall high-heat-conductivity cold-rolled steel plate through forming and automatic resistance welding. A 220kV transformer is usually provided with about 250 cooling fins, and the number of welding seams is large, so that the welding quality directly influences the long-term operation safety of equipment. At present, the weld quality of the radiating fin mainly depends on visual detection and hydrostatic test, the former only can find surface defects, and the latter only can detect penetrating defects, and internal non-penetrating defects such as unfused and the like cannot be identified. The hydrostatic test results for such defects may be acceptable, but unfused may develop under oil pressure and thermal stress over long term operation, resulting in leakage of insulating oil. Meanwhile, the hydrostatic test flow is complex and takes a long time. Therefore, the existing heat sink welding seam detection method has a large limitation. Disclosure of Invention The embodiment of the application aims to provide an ultrasonic detection device for a welding seam of a radiating fin, which aims to solve the problem that a short plate exists in the aspects of defect detection capability, efficiency and reliability guarantee in the existing welding seam detection technology. In order to solve the technical problems, the embodiment of the application provides the following technical scheme: The application provides a radiating fin welding seam ultrasonic detection device which comprises a frame body, a connection mechanism and an elastic mechanism, wherein the connection mechanism is connected with the frame body through the elastic mechanism, the connection mechanism can reciprocate along a first direction through the elastic mechanism, an ultrasonic detection wheel is used for detecting welding seams of radiating fin welding pieces, the ultrasonic detection wheel is rotationally connected with the connection mechanism so that the ultrasonic detection wheel can rotate by taking the connection mechanism as a central shaft, an auxiliary wheel is oppositely arranged along the first direction and rotationally connected with the frame body, the ultrasonic detection wheel and the auxiliary wheel can be symmetrically arranged on two sides of the thickness direction of the radiating fin welding pieces and synchronously roll along the surfaces of the radiating fin welding pieces, and under the action of the elastic mechanism, a first distance between a first peripheral surface of the ultrasonic detection wheel and a second peripheral surface of the auxiliary wheel can be adjusted according to the thickness of the radiating fin welding pieces and is not larger than the first distance of the radiating fin welding pieces in an initial state. In some embodiments of the application, the second peripheral surface of the auxiliary wheel is provided with a magnetic layer or an adhesive layer, the auxiliary wheel being capable of generating an adhesive force in a state of contact with the surface of the fin weldment. In some embodiments of the present application, the elastic mechanism includes a pair of elastic members and a guiding structure, the guiding structure is disposed along the first direction, the pair of elastic members are disposed on two sides of the guiding structure, the connecting mechanism is a columnar structure disposed along the second direction, the ultrasonic detection wheel is sleeved on the periphery of the connecting mechanism, the pair of elastic members are symmetrically disposed on two sides of the ultrasonic detection wheel along the length direction of the connecting mechanism, the connecting mechanism is slidingly connected with the guiding structure along the first direction, and the first direction and the second direction are perpendicular. In some embodiments of the application, the ultrasonic detection wheel comprises a wheel body, a piezoelectric wafer and a signal transmission device, wherein the wheel body is rotationally connected with the connecting mechanism, the piezoelectric wafer is circumferentially arranged along the wheel body, one surface of the piezoelectric wafer, which is opposite to the wheel body, forms the first peripher