Array weak magnetic probe welding seam detection device

Abstract

The utility model discloses an array weak magnetic probe welding seam detection device, which belongs to the technical field of nondestructive testing, and comprises a push rod, the surface of the push rod is rotatably connected with a universal joint assembly, the surface of the universal joint assembly is provided with a carriage, the inner wall of the carriage is provided with a non-magnetic rotary encoder, and the non-magnetic rotary encoder is connected with the push rod. The problems that an existing welding seam detection technology has many limitations, although ultrasonic detection has a certain effect on internal defect detection, the sensitivity of surface and near surface defect detection is poor, the result is greatly influenced by experience of detection personnel, internal defects can be clearly presented through ray detection, radiation hazards exist, the cost is high, and the detection efficiency is high are solved. The weak magnetic field detection device solves the problems that the existing weak magnetic field detection device has strict requirements on the detection environment, workpieces need to be cleaned after detection, and in addition, the existing weak magnetic field detection device also has defects, part of probes are unreasonable in structural design, low in detection efficiency and difficult to meet large-scale rapid detection requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to nondestructive testing technical field, especially array weak magnetic probe weld joint detection device. BACKGROUND

[0002] In industrial production, the weld quality is directly related to the safety and reliability of the product, for example, in petroleum, chemical industry, construction, machinery manufacturing and many other fields, a large number of metal structural parts are connected together through welding process, however, various defects may occur in the welding process, such as cracks, pores, slag inclusion, etc., these defects will reduce the carrying capacity of the structural parts, and even cause safety accidents.

[0003] In the traditional metal magnetic memory detection, the magnetic signal is often weak under the action of the environmental magnetic field, that is, the geomagnetic field (the geomagnetic field intensity is within 40 A / m), and the signal characteristics are not obvious, at the same time, due to the complex surface of the workpiece, the probe cannot always be well attached to the surface of the workpiece during actual operation, causing signal loss and affecting detection.

[0004] The existing patent (publication number: CN214844976U) discloses a metal magnetic memory detection device under weak magnetic field excitation, belonging to the field of metal magnetic memory nondestructive testing, including a probe, a shell and a PC end; the probe is nested in the shell, the probe and the shell are both non-ferromagnetic materials, a plurality of compression springs are arranged between the probe and the shell, and the probe can move axially in the shell; a three-axis magnetoresistance sensor array, a circuit board and an excitation yoke are arranged inside the probe, the utility model improves the weak signal of the traditional magnetic memory detection, highlights the signal characteristics of the magnetic memory detection, realizes the rapid detection of the stress concentration state of the in-service workpiece, and can make the detection surface of the probe fully adhere to the surface of the workpiece, improve the efficiency and accuracy of detection.

[0005] In view of the above problems, the existing patent provides a solution, but the existing weld joint detection technology has many limitations, ultrasonic detection has certain effect on internal defect detection, but the detection sensitivity of surface and near-surface defects is poor, and the result is greatly affected by the experience of the detection personnel, the internal defects can be clearly presented by the ray detection, but there is radiation hazard, high cost, strict requirements for detection environment, the magnetic powder detection is only suitable for surface and near-surface defect detection of ferromagnetic materials, and cannot be used for non-ferromagnetic materials, and the workpiece needs to be cleaned after detection, in addition, the existing weak magnetic detection device also has defects, the structure of part of the probe is unreasonable, the detection efficiency is low, it is difficult to meet the demand of large-scale rapid detection, the stability and flexibility of some devices are insufficient when moving, it is difficult to adapt to the detection of workpieces of different shapes and sizes, at the same time, there are limitations in signal acquisition and processing, resulting in that the accuracy and reliability of the detection result need to be improved.

[0006] To this end, an array weak magnetic probe weld detection device is provided. Content of the utility model

[0007] The array weak magnetic probe weld detection device can solve the problems of the existing weld detection technology, such as many limitations, poor sensitivity of ultrasonic detection for surface and near-surface defects, great influence of the result on the experience of detection personnel, clear internal defects of ray detection, radiation hazards, high cost, harsh requirements for detection environment, and the like, and the problems of the existing weak magnetic detection device, such as unreasonable structure design of some probes, low detection efficiency, poor stability and flexibility of some devices during movement, and the like.

[0008] To achieve the above object, the utility model provides the following technical scheme: an array weak magnetic probe weld detection device, comprising a push rod, the surface of the push rod is rotationally connected with a universal joint assembly, the surface of the universal joint assembly is provided with a carriage, the inner wall of the carriage is provided with a non-magnetic rotary encoder, the rear side of the non-magnetic rotary encoder is provided with a driven wheel, the right side of the carriage is provided with a front wheel, the left side of the carriage is provided with a rear wheel, the inner wall of the carriage is clamped with a rear cover plate, the inner wall of the carriage is provided with a weak magnetic sensor, the inner wall of the carriage is clamped with a front cover plate, the top of the carriage is provided with a main cover plate, and the inner wall of the main cover plate is provided with a jack female head.

[0009] Preferably, the front side of the carriage is provided with a first rib plate, and the rear side of the carriage is provided with a second rib plate.

[0010] Preferably, the front wheel is rotationally connected with the first rib plate, and the first rib plate is rotationally connected with the second rib plate.

[0011] Preferably, the inner wall of the main cover plate is provided with a mounting hole, and the jack female head is arranged in the inner wall of the main cover plate through the mounting hole.

[0012] Preferably, the driven wheel is movably connected with the non-magnetic rotary encoder, and the surface of the non-magnetic rotary encoder is provided with a micro bearing.

[0013] Preferably, the carriage comprises an encoder lug, a universal joint limiting hole, a rear cavity, a middle cavity and a front cavity, and the micro bearing is arranged in the inner wall of the encoder lug.

[0014] Preferably, the inner wall of the first rib plate is provided with a signal line slot.

[0015] Preferably, the weak magnetic sensor is electrically connected with the jack female head.

[0016] Compared with the prior art, the welding seam detection device has the advantages that:

[0017] The application sets the push rod, the universal joint assembly, the carriage and the non-magnetic rotary encoder, and when in use, the push rod is rotationally connected with the universal joint assembly, so that the operation of the pushing device is more flexible, and the moving demand in different detection environments can be better adapted to, the universal joint assembly is connected with the carriage, the stability of the carriage in the moving process is ensured, the non-magnetic rotary encoder arranged on the inner wall of the carriage cooperates with the driven wheel, the moving data of the trolley can be recorded in real time, and then the high-precision positioning of the welding seam defect is realized by combining the detection data of the weak magnetic sensor, the front wheel arranged on the right side of the carriage cooperates with the rear wheel, the stability of the device in the moving process on the welding seam is ensured, the stability of the detection process is improved, the front cover plate and the rear cover plate are clamped with the inner wall of the carriage, the inner parts of the carriage are convenient to maintain and overhaul, the weak magnetic sensor arranged on the inner wall of the carriage, especially the array distribution, the horizontal weak magnetic sensor expands the detection range, the maximum width reaches 140 mm, the missed detection caused by the deviation of the moving direction of the device can be effectively avoided, the upper layer differential sensor in the vertical array on the left and right sides can effectively eliminate the signal anomaly caused by non-defects, and the accuracy of the detection result is significantly improved, the jack female head arranged on the inner wall of the main cover plate is used for connecting the signal line of the weak magnetic sensor, the signal line is closed in the carriage, the signal line is protected, the appearance of the device is simple and beautiful, the signals of the weak magnetic sensor and the non-magnetic rotary encoder are conveniently uploaded to the host computer for processing and analysis, the detection accuracy and efficiency are improved as a whole, and the device has the advantages of simple and reliable structure, low cost and labor-saving comfort. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an overall structural diagram of the array weak magnetic probe welding seam detection device of the utility model;

[0019] Figure 2 It is a structural diagram of the rear cover plate of the utility model;

[0020] Figure 3 It is a top view of the weak magnetic sensor of the utility model;

[0021] Figure 4 It is a structural diagram of the carriage of the utility model;

[0022] Figure 5 It is a structural diagram of the encoder lug of the utility model;

[0023] Figure 6 It is a structural diagram of the micro bearing of the utility model;

[0024] Figure 7 It is the structure diagram of the second rib plate of the utility model;

[0025] Figure 8 It is the structure diagram of the first rib plate of the utility model;

[0026] Figure 9 It is the section view of the middle cavity of the utility model;

[0027] Figure 10 It is the original signal curve diagram of the weak magnetic sensor in the experiment of the utility model;

[0028] Figure 11 It is the differential signal curve diagram of the weak magnetic sensor of the utility model.

[0029] In the drawing, 1, push rod, 2, universal joint assembly, 3, carriage, 301, encoder lug, 302, universal joint limiting hole, 303, rear cavity, 304, middle cavity, 305, front cavity, 4, driven wheel, 5, rear wheel, 6, non-magnetic rotary encoder, 7, first rib plate, 8, main cover plate, 9, aviation plug female head, 10, second rib plate, 11, front wheel, 12, rear cover plate, 13, weak magnetic sensor, 14, front cover plate, 15, micro bearing, 16, mounting hole, 17, signal line slot. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] Please refer to Figures 1-8 The utility model provides technical schemes:

[0032] An array weak magnetic probe weld joint detection device, including push rod 1, the surface of push rod 1 is rotatably connected with universal joint assembly 2, the surface of universal joint assembly 2 is provided with carriage 3, the inner wall of carriage 3 is provided with non-magnetic rotary encoder 6, the rear side of non-magnetic rotary encoder 6 is provided with driven wheel 4, the right side of carriage 3 is provided with front wheel 11, the left side of carriage 3 is provided with rear wheel 5, the inner wall of carriage 3 is clamped with rear cover plate 12, the inner wall of carriage 3 is provided with weak magnetic sensor 13, the inner wall of carriage 3 is clamped with front cover plate 14, the top of carriage 3 is provided with main cover plate 8, the inner wall of main cover plate 8 is provided with aviation plug female head 9.

[0033] In the embodiment: by setting the push rod 1, the universal joint assembly 2, the carriage 3 and the non-magnetic rotary encoder 6, when in use, the push rod 1 is rotatably connected with the universal joint assembly 2, so that the operation of the pushing device is more flexible, and the movement demand in different detection environments can be better adapted, the universal joint assembly 2 is connected with the carriage 3, so as to ensure the stability of the carriage 3 during movement, the non-magnetic rotary encoder 6 arranged on the inner wall of the carriage 3 cooperates with the driven wheel 4, so as to record the movement data of the trolley in real time, and then the high-precision positioning of the weld defects is realized by combining the detection data of the weak magnetic sensor 13, the front wheel 11 arranged on the right side of the carriage 3 cooperates with the rear wheel 5, so as to ensure the stability of the device moving on the weld, and improve the stability of the detection process, the front cover plate 14 and the rear cover plate 12 are clamped with the inner wall of the carriage 3, so as to facilitate disassembly and installation, and facilitate maintenance and repair of the internal components of the carriage 3, the weak magnetic sensor 13 arranged on the inner wall of the carriage 3, especially in array distribution, the horizontal direction sensor expands the detection range, and the maximum width reaches 140mm, so as to effectively avoid the missed detection caused by the deviation of the movement direction of the device, and the upper layer of the differential sensor arranged in the vertical direction on the left and right sides can effectively eliminate the signal anomaly caused by non-defects, so as to significantly improve the accuracy of the detection result, the aviation plug female head 9 arranged on the inner wall of the main cover plate 8 is used for connecting the signal line of the weak magnetic sensor 13, and the signal line is closed in the carriage 3, so as to protect the signal line, and make the appearance of the device simple and beautiful, and at the same time, the signal of the weak magnetic sensor 13 and the non-magnetic rotary encoder 6 is conveniently uploaded to the upper computer for processing and analysis, so as to improve the detection accuracy and efficiency as a whole, and the structure is simple and reliable, the cost is low, and the operation is labor-saving and comfortable.

[0034] Specifically, as shown in Figure 4 , the front side of the carriage 3 is provided with a first rib plate 7, and the rear side of the carriage 3 is provided with a second rib plate 10.

[0035] Specifically, as shown in Figure 4 , the front wheel 11 is rotatably connected with the first rib plate 7, and the first rib plate 7 is rotatably connected with the second rib plate 10.

[0036] Specifically, as shown in Figure 4 , the inner wall of the main cover plate 8 is provided with a mounting hole 16, and the aviation plug female head 9 is arranged on the inner wall of the main cover plate 8 through the mounting hole 16.

[0037] In the embodiment, the first rib plate 7 is arranged at the front side of the carriage 3 and the second rib plate 10 is arranged at the rear side of the carriage 3, the first rib plate 7 not only provides a stable mounting position for the front wheel 11 and enhances the stability of the connection between the front wheel 11 and the carriage 3, but also is rotatably connected with the second rib plate 10, so that the overall structure of the carriage 3 has better flexibility and adaptability during movement and can better fit different shapes of welds, the front wheel 11 is rotatably connected with the first rib plate 7, ensuring the flexibility of the rotation of the front wheel 11, making the device easier to turn during detection, and further improving the convenience of detection, and the jack female head 9 is arranged through the mounting hole 16 in the inner wall of the main cover plate 8, which is simple and stable in installation and can reliably fix the jack female head 9, ensuring the stability of the sensor signal transmission.

[0038] Specifically, as shown in Figure 6 The driven wheel 4 is movably connected with the non-magnetic rotary encoder 6, and the surface of the non-magnetic rotary encoder 6 is provided with a micro bearing 15.

[0039] Specifically, as shown in Figure 5 The carriage 3 includes an encoder lug 301, a universal joint limiting hole 302, a rear cavity 303, a middle cavity 304, and a front cavity 305, and the micro bearing 15 is arranged on the inner wall of the encoder lug 301.

[0040] In the embodiment, the driven wheel 4 is movably connected with the non-magnetic rotary encoder 6 and cooperates with the micro bearing 15, so that the driven wheel 4 rotates more smoothly, reducing friction and resistance and improving the accuracy of data recorded by the non-magnetic rotary encoder 6, thereby improving the positioning accuracy of the weld defects, the micro bearing 15 is arranged on the inner wall of the encoder lug 301, providing stable support and a good rotating environment for the non-magnetic rotary encoder 6, ensuring its stable work, and the structures of the encoder lug 301, the universal joint limiting hole 302, the rear cavity 303, the middle cavity 304, and the front cavity 305 of the carriage 3 are reasonably arranged, providing suitable installation space for each component and facilitating the assembly and maintenance of the equipment.

[0041] Specifically, as shown in Figure 8 The inner wall of the first rib plate 7 is provided with a signal line groove 17.

[0042] Specifically, as shown in Figure 1 The weak magnetic sensor 13 is electrically connected with the jack female head 9.

[0043] In the embodiment: the signal line slot 17 opened in the inner wall of the first rib plate 7 can orderly accommodate and protect the signal line of the non-magnetic rotary encoder 6, avoid the signal line from being squeezed and worn during the operation of the device, ensure the reliability of signal transmission, and electrically connect the weak magnetic sensor 13 and the female head 9, so that the signals collected by the weak magnetic sensor 13 can be stably and quickly transmitted to the upper computer, facilitating timely processing and analysis of detection data, and improving detection efficiency and accuracy.

[0044] As shown in Figure 9 , it is a cross-sectional view of the middle cavity 304, clearly showing the arrangement of 12 arrayed weak magnetic sensors 13. These sensors are divided into differential sensors (1301, 1311) and signal sensors (others) according to their functions in the device. The data of the signal sensors and the differential sensors are subtracted to eliminate background noise.

[0045] As shown in Figure 10 , it is the original signal curve collected by the weak magnetic sensors 1301 and 1306 in the experiment. As shown in the figure, a manual jitter is created at sampling points 40-50. The sensors 1301 and 1306 detect the jitter at the same time, and the signals change at the same time. At sampling points 85-100, a defect passes directly below the weak magnetic sensor 1306, causing the sensor 1306 signal to change. The sensor 1301 is far away from the defect and does not cause obvious signal change.

[0046] As shown in Figure 11 , it is the differential signal curve of the weak magnetic sensor 1306, which is obtained by Figure 10 subtracting the original signal of the weak magnetic sensor 1301 from the original signal of the weak magnetic sensor 1306. By comparing the original signal of the sensor 1306 with the differential signal, the signal characteristics caused by jitter are suppressed, and the defect signal characteristics are retained. This experimental result shows that the differential jitter design of the device can successfully filter out the signal abnormalities caused by jitter during detection, improve detection accuracy, and has strong practicality.

[0047] Working principle: during the use of the push rod 1, the universal joint assembly 2 and the carriage 3, by setting the push rod 1, the universal joint assembly 2, the carriage 3 and the non-magnetic rotary encoder 6, the rotation connection of the push rod 1 and the universal joint assembly 2 makes the operation of the pushing device more flexible, and better adapts to the movement requirements in different detection environments, the universal joint assembly 2 connects the carriage 3, ensuring the stability of the carriage 3 during movement, the non-magnetic rotary encoder 6 arranged on the inner wall of the carriage 3 cooperates with the driven wheel 4, which can record the trolley movement data in real time, and then combined with the weak magnetic sensor 13 detection data to realize high-precision positioning of the weld defects, the front wheel 11 arranged on the right side of the carriage 3 cooperates with the rear wheel 5, which ensures the stability of the device moving on the weld, improves the stability of the detection process, the front cover plate 14 and the rear cover plate 12 are clamped with the inner wall of the carriage 3, which is convenient for disassembly and installation, and is convenient for maintaining and repairing the internal components of the carriage 3, the weak magnetic sensor 13 arranged on the inner wall of the carriage 3, especially the array distribution, the horizontal weak magnetic sensor 13 expands the detection range, and the maximum width reaches 140mm, which can effectively avoid the missed detection caused by the deviation of the device moving direction, and the upper layer differential sensor arranged in the vertical direction on the left and right sides can effectively eliminate the signal anomaly caused by non-defects, which significantly improves the accuracy of the detection result, the aviation plug female head 9 arranged on the inner wall of the main cover plate 8 is used for connecting the signal line of the weak magnetic sensor 13, which closes the signal line in the carriage 3, which protects the signal line and makes the appearance of the device simple and beautiful, and at the same time, it is convenient to upload the weak magnetic sensor 13 and the non-magnetic rotary encoder 6 signal to the upper computer for processing and analysis, which improves the detection accuracy and efficiency as a whole, and the structure is simple and reliable, low in cost and labor-saving and comfortable.

[0048] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A weld seam inspection device using an array of weak magnetic probes, comprising a push rod (1), characterized in that: The surface of the push rod (1) is rotatably connected to a universal joint assembly (2). The surface of the universal joint assembly (2) is provided with a carriage (3). The inner wall of the carriage (3) is provided with a non-magnetic rotary encoder (6). The rear side of the non-magnetic rotary encoder (6) is provided with a driven wheel (4). The right side of the carriage (3) is provided with a front wheel (11). The left side of the carriage (3) is provided with a rear wheel (5). The inner wall of the carriage (3) is snapped with a rear cover plate (12). The inner wall of the carriage (3) is provided with a weak magnetic sensor (13). The inner wall of the carriage (3) is snapped with a front cover plate (14). The top of the carriage (3) is provided with a main cover plate (8). The inner wall of the main cover plate (8) is provided with an aircraft plug head (9).

2. The array-based weak magnetic probe weld inspection device according to claim 1, characterized in that: The front side of the carriage (3) is provided with a first rib plate (7), and the rear side of the carriage (3) is provided with a second rib plate (10).

3. The array weak magnetic probe weld inspection device according to claim 2, characterized in that: The front wheel (11) is rotatably connected to the first rib (7), and the first rib (7) is rotatably connected to the second rib (10).

4. The array-based weak magnetic field probe weld inspection device according to claim 1, characterized in that: The inner wall of the main cover plate (8) is provided with mounting holes (16), and the aircraft plug head (9) is set on the inner wall of the main cover plate (8) through the mounting holes (16).

5. The array weak magnetic probe weld inspection device according to claim 1, characterized in that: The driven wheel (4) is movably connected to the non-magnetic rotary encoder (6), and the surface of the non-magnetic rotary encoder (6) is provided with a miniature bearing (15).

6. The array weak magnetic probe weld inspection device according to claim 5, characterized in that: The carriage (3) includes an encoder lug (301), a universal joint limiting hole (302), a rear cavity (303), a middle cavity (304), and a front cavity (305), and the miniature bearing (15) is disposed on the inner wall of the encoder lug (301).

7. The array weak magnetic probe weld inspection device according to claim 2, characterized in that: The inner wall of the first rib (7) is provided with a signal line groove (17).

8. The array weak magnetic probe weld inspection device according to claim 1, characterized in that: The weak magnetic sensor (13) is electrically connected to the aircraft plug head (9).

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