High-precision ultrasonic flaw detector for quality detection

Abstract

The invention discloses a high-precision ultrasonic flaw detector for quality detection, and particularly relates to the technical field of ultrasonic detectors, the high-precision ultrasonic flaw detector comprises a plurality of mounting support legs, a control device is arranged at the upper ends of the mounting support legs, a multi-stage telescopic rod is arranged at the left end of the control device, and a driven device is arranged at the output end of the multi-stage telescopic rod. An ultrasonic flaw detector body is arranged at the output end of the driven device, the control device comprises a control box body, a spherical mounting block with a notch is arranged on the right side face of an inner cavity of the control box body, a control device is arranged in an inner cavity of the spherical mounting block, and a driving device is arranged on the left side face of the inner cavity of the control box body. According to the high-precision ultrasonic flaw detector for quality detection, the design that the control device is matched with the driven device is adopted, so that the high-precision ultrasonic flaw detector can perform flaw detection on substances at different inclination angles or in narrow spaces, and the applicability of the high-precision ultrasonic flaw detector during use is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic detectors, and in particular to a high-precision ultrasonic flaw detector for quality detection. Background Art

[0002] Ultrasonic flaw detector is a portable industrial non-destructive flaw detection instrument, which can quickly, conveniently, non-destructively and accurately detect, locate, evaluate and diagnose various defects (cracks, looseness, pores, inclusions, etc.) inside the workpiece. It can be used in laboratories as well as on-site projects. It is widely used in boilers, pressure vessels, aerospace, aviation, electric power, petroleum, chemical industry, offshore oil, pipelines, military industry, shipbuilding, automobiles, machinery manufacturing, metallurgy, metal processing industry, steel structure, railway transportation, nuclear power, colleges and universities and other industries.

[0003] Chinese patent document CN111208208A discloses a high-precision ultrasonic flaw detector for quality inspection, including a main body, a signal line and a detection device, the detection device includes a grip, a connecting plate, an infusion mechanism, a sealing mechanism and a probe, the sealing mechanism includes a sealing shell, a telescopic component, a telescopic plate and a sealing component, the sealing component includes a track, an air bag and two sealing units, the infusion mechanism includes a storage box, a delivery tube, a first liquid tube and a second liquid tube, and a translation component, a sealing block, a sealing plate and a connecting rod are arranged in the delivery tube. The high-precision ultrasonic flaw detector for quality inspection protects the probe through the sealing mechanism to avoid the probe from moving on the surface of the workpiece during detection and causing wear, thereby shortening the service life. In addition, the coupling agent is injected into the sealing shell by the infusion mechanism, and the coupling agent can be driven to move by the movement of the sealing shell, which not only improves the detection accuracy, but also reduces the consumption of the coupling agent, reduces the detection cost, and improves the practicality of the equipment. Improves the practicality of the equipment. When in use, the device can only perform flaw detection on materials with a larger spatial position, and cannot perform flaw detection on materials with different inclination angles or in a narrow space. The applicability of the device is poor. Summary of the invention

[0004] The main purpose of the present invention is to provide a high-precision ultrasonic flaw detector for quality inspection, which can effectively solve the problem raised in the above background that it is impossible to perform flaw detection on materials at different inclination angles or in a narrow space.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A high-precision ultrasonic flaw detector for quality inspection, comprising a plurality of mounting legs, a control device is provided at the upper end of the plurality of mounting legs, a multi-stage telescopic rod is provided at the left end of the control device, a driven device is provided at the output end of the multi-stage telescopic rod, an ultrasonic flaw detector body is provided at the output end of the driven device, a camera and an illuminator are provided at the upper end of the driven device, a connecting wire tube is connected between the control device and the driven device, and a display screen is provided at the upper end of the control device; The control device includes a control box body, a spherical mounting block with a notch is provided on the right side surface of the inner cavity of the control box body, a control device is provided in the inner cavity of the spherical mounting block, an active device is provided on the left side surface of the inner cavity of the control box body, a fixing block is provided at the left end of the control box body, a first take-up wheel is provided at the front end of the fixing block, a first bevel gear for driving the first take-up wheel is provided at the rear end of the fixing block, a second bevel gear meshing with the first bevel gear is provided at the left end of the control box body, a first mounting groove is opened at the front part of the left end of the control box body, and the first mounting groove is communicated with the interior of the control box body, and an anti-scratch block is provided in the first mounting groove.

[0006] Preferably, the control device includes a control ball, which is spherical, and a control handle is provided on the upper portion of the outer surface of the control ball. An array of meshing rings is provided on the outer surface of the control ball, and the outer sides of the remaining meshing rings, except for the meshing ring located in the middle, are inclined toward a side away from the meshing ring located in the middle.

[0007] Preferably, the spherical mounting block is in communication with the outside, and the control handle is located outside the control box.

[0008] Preferably, the active device includes a first rotating block, two first supporting blocks are provided at one end of the first rotating block close to the control device, a rotating disk is provided between the two first supporting blocks, a first gear is provided at the front end of the first supporting block at the front end, a second gear meshing with the first gear is provided at the front end of the first supporting block at the front end, and a second take-up wheel is provided at the front end of the second gear.

[0009] Preferably, a plurality of meshing teeth meshing with the control handle are provided in an annular array on the outer surface of the rotating disk, and the meshing teeth are inclined toward a side away from the control handle near the middle of a side of the control handle.

[0010] Preferably, the anti-scratch block comprises a second rotating block, a guide groove is provided at the left end of the second rotating block, first return springs are provided at both upper and lower ends of the guide groove, and a plurality of pulleys are provided in a circular array in the inner cavity of the guide groove close to the control device.

[0011] Preferably, the driven device includes a driven housing, a third take-up wheel is provided on a side of the inner cavity of the driven housing close to the multi-stage telescopic rod, a third rotating block is provided on an end of the third take-up wheel away from the multi-stage telescopic rod, two second support blocks are provided on an end of the third rotating block away from the third take-up wheel, a connecting rod is provided between the two second support blocks, a fourth take-up wheel for driving the connecting rod is provided at the front end of the second support block located on the front side, a second mounting groove is provided at the front portion of the driven housing close to one end of the multi-stage telescopic rod, and the anti-scratch block is installed in the fourth take-up wheel.

[0012] Preferably, a guide wire is wound between the third take-up wheel and the second take-up wheel, and between the first take-up wheel and the fourth take-up wheel. The guide wire between the third take-up wheel and the second take-up wheel passes through the two guide grooves, and the guide wire between the first take-up wheel and the fourth take-up wheel passes through the guide groove located in the second mounting groove.

[0013] Preferably, connecting rods are provided between the rotating disk and the first gear, and between the first rotating block and the second bevel gear, and torsion springs are connected between the two connecting rods and the first supporting block and the fixed block, respectively.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a design in which a control device and a driven device cooperate with each other. The meshing ring and the rotating disk are matched with each other by rotating the control handle, thereby driving the active device to rotate accordingly. Then the active device shrinks or releases the guide wire through the second gear and the first bevel gear. The shrinkage or release of the guide wire will drive the fourth take-up wheel and the third take-up wheel to rotate accordingly, and further cause the third rotating block and the connecting rod to rotate accordingly, thereby controlling the tilt direction of the ultrasonic flaw detector body. When the guide wire passes through the guide groove, it will drive the pulley to rotate, reducing the friction between the guide wire and the second rotating block, increasing the service life of the guide wire, and starting the ultrasonic flaw detector body to detect the material to be detected, so that the device can perform flaw detection on materials with different tilt angles or in a small space, thereby increasing the applicability of the device when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the control device of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 It is a schematic diagram of the structure of the active device of the present invention; Figure 5It is a partial structural schematic diagram of the control device of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 It is a schematic diagram of the structure of the rotating disk and the control device of the present invention; Figure 8 It is a partial structural schematic diagram of the driven device of the present invention; Fig. 9 It is a partial structural schematic diagram of the driven device of the present invention; Fig.10 It is a schematic diagram of the overall structure of the device when the driven device of the present invention is tilted.

[0016] In the figure: 1, mounting legs; 2, control device; 3, driven device; 11, multi-stage telescopic rod; 12, ultrasonic flaw detector body; 13, camera; 14, lighting lamp; 15, connecting wire tube; 16, display screen; 21, control box; 211, spherical mounting block; 22, control device; 221, control ball; 222, control handle; 223, meshing ring; 23, active device; 231, first rotating block; 232, first supporting block; 233, rotating disk; 2331, meshing teeth; 23 4. First gear; 235. Second gear; 236. Second take-up wheel; 24. Fixed block; 25. First take-up wheel; 26. First bevel gear; 27. Second bevel gear; 28. First mounting groove; 29. ​​Anti-scratch block; 291. Second rotating block; 292. Guide groove; 293. First return spring; 294. Pulley; 31. Driven housing; 32. Third take-up wheel; 33. Third rotating block; 34. Second supporting block; 35. Connecting rod; 36. Fourth take-up wheel; 37. Second mounting groove. Implementation

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figure 1-10As shown, a high-precision ultrasonic flaw detector for quality inspection comprises a plurality of mounting legs 1, a control device 2 is commonly provided at the upper ends of the plurality of mounting legs 1, the connection relationship between the mounting legs 1 and the control device 2 is a fixed connection, a multi-stage telescopic rod 11 is provided at the left end of the control device 2, the connection relationship between the control device 2 and the multi-stage telescopic rod 11 is a fixed connection, the multi-stage telescopic rod 11 is used to extend a driven device 3, and extend the driven device 3 to a desired flaw detection position, a driven device 3 is provided at the output end of the multi-stage telescopic rod 11, the connection relationship between the output end of the multi-stage telescopic rod 11 and the driven device 3 is a fixed connection, an ultrasonic flaw detector body 12 is provided at one end of the driven device 3 away from the multi-stage telescopic rod 11, the connection relationship between the driven device 3 and the ultrasonic flaw detector body 12 is a fixed connection, the ultrasonic flaw detector body 12 is a prior art, and the driven device 3 is used to control the ultrasonic flaw detector The angle adjustment of the body 12 enables the ultrasonic flaw detector body 12 to detect materials at various angles. A camera 13 and an illuminator 14 are provided at the upper end of the driven device 3. The connection relationship between the camera 13, the illuminator 14 and the driven device 3 is fixedly connected. The camera 13 and the illuminator 14 are both prior art. A connecting wire tube 15 is connected between the control device 2 and the driven device 3. The connection relationship between the connecting wire tube 15 and the control device 2 and the driven device 3 is fixedly connected. A display screen 16 is provided at the upper end of the control device 2. The connection relationship between the display screen 16 and the control device 2 is fixedly connected. The display screen 16 is prior art. The camera 13 transmits the captured information to the display screen 16. The position of the ultrasonic flaw detector body 12 can be observed through the display screen 16, so that the ultrasonic flaw detector body 12 is convenient to operate even after it is extended into a narrow space; The control device 2 includes a control box 21. The connection between the control box 21 and the mounting legs 1 and the multi-stage telescopic rod 11 is a fixed connection. A spherical mounting block 211 with a notch is provided on the right side of the inner cavity of the control box 21, and the spherical mounting block 211 is communicated with the outside. The connection between the spherical mounting block 211 and the control box 21 is a fixed connection. The spherical mounting block 211 is used for the installation of the control device 22. The inner cavity of the spherical mounting block 211 is provided with a control device 22, and the connection between the control device 22 and the spherical mounting block 211 is a movable connection. An active device 23 is provided on the left side of the inner cavity of the control box 21, and the connection between the active device 23 and the control box 21 is a rotating connection. The active device 23 cooperates with the control device 22 to make the driven device 3 adjust accordingly, so that the ultrasonic flaw detector body 12 can detect objects at different angles.

[0019] Specifically, a fixed block 24 is provided at the left end of the control box 21, and the connection relationship between the control box 21 and the fixed block 24 is a fixed connection. The fixed block 24 is used to install the first take-up wheel 25 and the first bevel gear 26. The first take-up wheel 25 is provided at the front end of the fixed block 24, and the connection relationship between the fixed block 24 and the first take-up wheel 25 is a rotation connection. The first bevel gear 26 for driving the first take-up wheel 25 is provided at the rear end of the fixed block 24. When the first rotating block 231 rotates, the second bevel gear 27 drives the first take-up wheel 25 to rotate through the first bevel gear 26. Rotation, the connection relationship between the fixed block 24 and the first take-up wheel 25 is a rotational connection, a second bevel gear 27 meshing with the first bevel gear 26 is provided at the left end of the control box 21, and the connection relationship between the second bevel gear 27 and the control box 21 is a rotational connection, a first mounting groove 28 is opened at the front of the left end of the control device 2, and the first mounting groove 28 is communicated with the interior of the control device 2, the first mounting groove 28 is used for the installation of an anti-scratch block 29, an anti-scratch block 29 is provided in the first mounting groove 28, and the connection relationship between the anti-scratch block 29 and the first mounting groove 28 is a rotational connection.

[0020] Furthermore, in order to enable the control device 22 to cooperate with the active device 23, as Figure 2 As shown, the control device 22 includes a control ball 221, which is spherical. A control handle 222 is provided on the upper portion of the outer surface of the control ball 221. The connection relationship between the control handle 222 and the control ball 221 is a fixed connection, and the control handle 222 is located outside the control box 21. The control device 22 is rotated by toggling the control handle 222, and the active device 23 is further rotated accordingly. A plurality of meshing rings 223 are provided in an array on the outer surface of the control ball 221. The connection relationship between the meshing rings 223 and the control ball 221 is a fixed connection. The plurality of meshing rings 223 mesh with the meshing teeth 2331 to enable the active device 23 to rotate accordingly. Except for the meshing ring 223 located in the middle, the outer sides of the remaining meshing rings 223 are inclined toward the side away from the meshing ring 223 located in the middle, so that the meshing teeth 2331 can better mesh with the meshing ring 223, thereby increasing the stability of the device during operation.

[0021] Furthermore, in order to enable the active device 23 to rotate according to the rotation of the control device 22, as shown in FIG. Figure 2-4As shown, the active device 23 includes a first rotating block 231, and the connection relationship between the first rotating block 231 and the control box body 21 is a rotating connection. The first rotating block 231 is used for the installation of the active device 23. The first rotating block 231 is provided with two first supporting blocks 232 at one end close to the control device 22. The first supporting blocks 232 are used for the installation of the rotating disk 233. The connection relationship between the first supporting blocks 232 and the first rotating block 231 is a fixed connection. A rotating disk 233 is provided between the two first supporting blocks 232. The connection relationship between the rotating disk 233 and the first supporting block 232 is a rotating connection. The rotating disk 233 cooperates with the control device 22 to enable the active device 23 to rotate accordingly.

[0022] Specifically, a first gear 234 is provided at the front end of the first support block 232 located at the front end, and the connection relationship between the first gear 234 and the first support block 232 located at the front end is a rotational connection. The first gear 234 is used to transmit the power of the rotating disk 233 to the second gear 235. A second gear 235 meshing with the first gear 234 is provided at the front end of the first support block 232 located at the front end, and the connection relationship between the second gear 235 and the first gear 234 located at the front end is a rotational connection. A second take-up wheel 236 is provided at the front end of the second gear 235, and the connection relationship between the second take-up wheel 236 and the second gear 235 is a fixed connection. Connecting rods are provided between the rotating disk 233 and the first gear 234, and between the first rotating block 231 and the second bevel gear 27, and the two connecting rods are respectively connected to the first support block 232 and the fixed block 24 with torsion springs, so that the ultrasonic flaw detector body 12 can be restored to a natural state when the device is not in use, to prevent the ultrasonic flaw detector body 12 from not rotating when the control device 22 is rotated.

[0023] Specifically, a plurality of meshing teeth 2331 meshing with the meshing ring 223 are provided in an annular array on the outer surface of the rotating disk 233. The connection relationship between the meshing teeth 2331 and the rotating disk 233 is a fixed connection, and the meshing teeth 2331 are inclined toward the side away from the meshing ring 223 near the middle of one side of the meshing ring 223, so that the rotating disk 233 can rotate with the rotation of the control device 22, and at the same time, it can better prevent the meshing teeth 2331 and the meshing ring 223 from getting stuck, thereby increasing the stability of the device during operation.

[0024] Furthermore, in order to reduce the wear and tear caused by wire transmission, Figure 5-6As shown, the anti-scratch block 29 includes a second rotating block 291, and the connection relationship between the second rotating block 291 and the first mounting groove 28 is a rotating connection. A guide groove 292 is opened at the left end of the second rotating block 291, and first return springs 293 are provided at both upper and lower ends of the second rotating block 291. The connection relationship between the two first return springs 293 and the second rotating block 291 is a fixed connection. A plurality of pulleys 294 are provided in a circular array on the inner cavity of the guide groove 292 close to the side of the control device 22, and the connection relationship between the plurality of pulleys 294 and the guide groove 292 is a rotating connection.

[0025] Furthermore, in order to allow the ultrasonic flaw detector body 12 to tilt when the control device 22 rotates, and further allow the ultrasonic flaw detector body 12 to perform flaw detection on materials with different tilt angles, the driven device 3 includes a driven housing 31, and the connection relationship between the driven housing 31 and the output end of the multi-stage telescopic rod 11 is a fixed connection. A third take-up wheel 32 is provided on a side of the inner cavity of the driven housing 31 close to the multi-stage telescopic rod 11, and the connection relationship between the third take-up wheel 32 and the driven housing 31 is a rotational connection. A third rotating block 33 is provided at one end away from the multi-stage telescopic rod 11, and the connection relationship between the third rotating block 33 and the third wire-taking wheel 32 is a fixed connection. Two second supporting blocks 34 are provided at one end of the third rotating block 33 away from the third wire-taking wheel 32, and the connection relationship between the two second supporting blocks 34 and the third rotating block 33 is a fixed connection. The two second supporting blocks 34 are used for installing a connecting rod 35, and a connecting rod 35 is provided between the two second supporting blocks 34, and the connection relationship between the two second supporting blocks 34 and the connecting rod 35 is a rotating connection.

[0026] Specifically, a fourth take-up wheel 36 for driving the connecting rod 35 is provided at the front end of the second support block 34 located at the front side. The fourth take-up wheel 36 is connected to the second support block 34 located at the front side in a rotational connection. The fourth take-up wheel 36 is connected to the fourth take-up wheel 36 in a fixed connection. A second mounting groove 37 is provided at the front end of the driven housing 31 close to one end of the multi-stage telescopic rod 11. The second mounting groove 37 is used for mounting the anti-scratch block 29, and the anti-scratch block 29 is mounted in the fourth take-up wheel 36. A guide line is wound between the third take-up wheel (32) and the second take-up wheel (236) and between the first take-up wheel (25) and the fourth take-up wheel (36). The guide line between the third take-up wheel (32) and the second take-up wheel (236) passes through two guide grooves (292), and the guide line between the first take-up wheel (25) and the fourth take-up wheel (36) passes through the guide groove (292) located in the second mounting groove (37).

[0027] The specific implementation is as follows: when in use, the multi-stage telescopic rod 11 is extended, and the ultrasonic flaw detector body 12 is extended into the tubular object or narrow space to be detected. The camera 13 transmits the collected information to the display screen 16, and the display screen 16 is observed. By rotating the control handle 222, the meshing ring 223 and the rotating disk 233 cooperate with each other, thereby driving the active device 23 to rotate accordingly. Then the active device 23 shrinks or releases the guide wire through the second gear 235 and the first bevel gear 26. The shrinkage or release of the guide wire will drive the fourth take-up wheel 36 and the third take-up wheel 32 to rotate accordingly, and further make the third rotating block 33 and the connecting rod 35 rotate accordingly, thereby controlling the tilt direction of the ultrasonic flaw detector body 12. When the guide wire passes through the guide groove 292, it will drive the first return spring 293 to rotate, reduce the friction between the guide wire and the second rotating block 291, and increase the service life of the guide wire. The ultrasonic flaw detector body 12 is started to detect the material to be detected, so that the device can detect materials at different tilt angles or in narrow spaces.

[0028] It should be noted that the specific installation and control methods of the ultrasonic flaw detector body 12, camera 13, lighting lamp 14, display screen 16, etc. in the present invention are conventional designs in the prior art and will not be elaborated in detail in the present invention.

[0029] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-precision ultrasonic flaw detector for quality inspection, comprising a plurality of mounting legs (1), characterized in that: A control device (2) is provided at the upper end of the plurality of mounting legs (1); a multi-stage telescopic rod (11) is provided at the left end of the control device (2); a driven device (3) is provided at the output end of the multi-stage telescopic rod (11); an ultrasonic flaw detector body (12) is provided at the output end of the driven device (3); a camera (13) and an illumination lamp (14) are provided at the upper end of the driven device (3); a connecting wire tube (15) is connected between the control device (2) and the driven device (3); and a display screen (16) is provided at the upper end of the control device (2); The control device (2) comprises a control box (21), a spherical mounting block (211) with a notch is provided on the right side of the inner cavity of the control box (21), a control device (22) is provided in the inner cavity of the spherical mounting block (211), an active device (23) is provided on the left side of the inner cavity of the control box (21), a fixing block (24) is provided at the left end of the control box (21), a first wire take-up wheel (25) is provided at the front end of the fixing block (24), a first bevel gear (26) for driving the first wire take-up wheel (25) is provided at the rear end of the fixing block (24), a second bevel gear (27) meshing with the first bevel gear (26) is provided at the left end of the control box (21), a first mounting groove (28) is provided at the front part of the left end of the control box (21), and the first mounting groove (28) is communicated with the interior of the control box (21), and a scratch-proof block (29) is provided in the first mounting groove (28).

2. A high-precision ultrasonic flaw detector for quality inspection according to claim 1, characterized in that: The control device (22) comprises a control ball (221), the control ball (221) is spherical, a control handle (222) is provided on the upper portion of the outer surface of the control ball (221), and a plurality of meshing rings (223) are provided in an array on the outer surface of the control ball (221), and the outer sides of the remaining meshing rings (223) are inclined toward a side away from the meshing ring (223) located in the middle, except for the meshing ring (223) located in the middle.

3. A high-precision ultrasonic flaw detector for quality inspection according to claim 2, characterized in that: The spherical mounting block (211) is in communication with the outside, and the control handle (222) is located outside the control box (21).

4. A high-precision ultrasonic flaw detector for quality inspection according to claim 2, characterized in that: The active device (23) comprises a first rotating block (231), two first supporting blocks (232) are provided at one end of the first rotating block (231) close to the control device (22), a rotating disk (233) is provided between the two first supporting blocks (232), a first gear (234) is provided at the front end of the first supporting block (232) at the front end, a second gear (235) meshing with the first gear (234) is provided at the front end of the first supporting block (232) at the front end, and a second take-up wheel (236) is provided at the front end of the second gear (235).

5. A high-precision ultrasonic flaw detector for quality inspection according to claim 4, characterized in that: A plurality of meshing teeth (2331) meshing with the control handle (222) are provided in an annular array on the outer surface of the rotating disk (233), and the meshing teeth (2331) are close to the middle of a side surface of the control handle (222) and are inclined toward a side away from the control handle (222).

6. The high-precision ultrasonic flaw detector for quality inspection according to claim 3, characterized in that: The anti-scratch block (29) comprises a second rotating block (291), a guide groove (292) is provided at the left end of the second rotating block (291), first return springs (293) are provided at both upper and lower ends of the guide groove (292), and a plurality of pulleys (294) are provided in a circular array on a side of the inner cavity of the guide groove (292) close to the control device (22).

7. A high-precision ultrasonic flaw detector for quality inspection according to claim 6, characterized in that: The driven device (3) comprises a driven housing (31); a third wire take-up wheel (32) is provided at a side of an inner cavity of the driven housing (31) close to the multi-stage telescopic rod (11); a third rotating block (33) is provided at an end of the third wire take-up wheel (32) away from the multi-stage telescopic rod (11); two second support blocks (34) are provided at an end of the third rotating block (33) away from the third wire take-up wheel (32); a connecting rod (35) is provided between the two second support blocks (34); a fourth wire take-up wheel (36) for driving the connecting rod (35) is provided at the front end of the second support block (34) located at the front side; a second mounting groove (37) is provided at the front part of the end of the driven housing (31) close to the multi-stage telescopic rod (11); and the anti-scratch block (29) is installed in the fourth wire take-up wheel (36).

8. The high-precision ultrasonic flaw detector for quality inspection according to claim 7, characterized in that: A guide line is wound between the third take-up wheel (32) and the second take-up wheel (236), and between the first take-up wheel (25) and the fourth take-up wheel (36); the guide line between the third take-up wheel (32) and the second take-up wheel (236) passes through the two guide grooves (292), and the guide line between the first take-up wheel (25) and the fourth take-up wheel (36) passes through the guide groove (292) located in the second installation groove (37).

9. The high-precision ultrasonic flaw detector for quality inspection according to claim 7, characterized in that: Connecting rods are provided between the rotating disk (233) and the first gear (234), and between the first rotating block (231) and the second bevel gear (27), and torsion springs are respectively connected between the two connecting rods and the first supporting block (232) and the fixed block (24).

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