An electromagnetic ultrasonic flaw detection device based on guided wave detection and a detection method thereof

Abstract

The invention relates to the technical field of nondestructive testing devices, and discloses an electromagnetic ultrasonic flaw detection device based on guided wave detection and a detection method thereof, comprising a main unit, wherein the main unit is electrically connected to a probe assembly through a wire, the probe assembly comprises a probe body, a side wall of the probe body is fixedly connected to an annular cylinder ink tank, a bottom of the annular cylinder ink tank is fixedly connected to a fixed ring sleeve, a plurality of fixed-angle ink outlet rods are arranged inside the fixed ring sleeve, the plurality of fixed-angle ink outlet rods are annularly distributed along the axis of the probe body, the bottom ends of the fixed-angle ink outlet rods penetrate into the annular cylinder ink tank and are connected to a diversion ring cylinder, the invention arranges an annular cylinder ink tank and a plurality of annularly distributed fixed-angle ink outlet rods on the probe part, when the device detects damage to a workpiece during flaw detection, the ink inside the annular cylinder ink tank can be extracted through the plurality of fixed-angle ink outlet rods and the damaged part can be marked, so that after the flaw detection process is completed, the damaged area can be immediately and conveniently identified, thereby greatly improving the detection efficiency and the convenience of subsequent processing.

Description

Technical Field

[0001] The present invention relates to the technical field of nondestructive testing devices, and more specifically to an electromagnetic ultrasonic flaw detection device based on guided wave detection and a detection method thereof. Background Art

[0002] Electromagnetic ultrasonic flaw detection device, based on guided wave detection, is an advanced non-destructive testing equipment. It combines electromagnetic ultrasonic technology and the principle of guided wave detection. It can detect defects inside and on the surface of the workpiece without damaging the workpiece. The guided wave is constrained by the medium boundary during propagation, and the energy attenuation along the propagation path is small, so long-distance detection can be achieved. The device uses electromagnetic ultrasonic transducer (EMAT) as the core, and can detect without using coupling agent, contact with the test piece, and pre-treatment of the test piece surface. It is mainly composed of electromagnetic ultrasonic transducer (detection probe), signal generator, signal receiving and processing system, etc. Among them, electromagnetic ultrasonic transducer (EMAT) is the key component to realize electromagnetic ultrasonic conversion and interact with the workpiece to be detected. It is usually composed of coils, magnets (or electromagnets), etc., and generates ultrasonic waves through interaction with the workpiece to be detected.

[0003] In the existing field of non-destructive testing technology, especially when performing flaw detection on tubular workpieces or other workpieces with complex curved surface structures, it is difficult for the probe to stably maintain an appropriate angle orientation. Especially when detecting tubular workpieces, the curved surface characteristics of the surface make it very easy for the probe to deviate in angle during movement, which greatly reduces the accuracy of the test results. In addition, after flaw detection, it is impossible to conveniently mark the location of the damaged position, which affects the subsequent workpiece processing. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an electromagnetic ultrasonic flaw detection device based on guided wave detection and a detection method thereof, so as to solve the problem that the probe of the existing electromagnetic ultrasonic flaw detection device in the above-mentioned background technology cannot mark the damaged part of the workpiece at a fixed point, and it is difficult to implement angle positioning for curved workpieces, especially tubular workpieces.

[0005] The present invention provides the following technical solution: an electromagnetic ultrasonic flaw detection device based on guided wave detection, comprising a main unit, the main unit being electrically connected to a probe assembly through a wire, the probe assembly comprising a probe body, a side wall of the probe body being fixedly connected to an annular cylinder ink tank, a bottom of the annular cylinder ink tank being fixedly connected to a fixed ring sleeve, a plurality of fixed-angle ink outlet rods being arranged inside the fixed ring sleeve, the plurality of fixed-angle ink outlet rods being distributed in an annular manner along the axis of the probe body, the bottom end of the fixed-angle ink outlet rod penetrating into the inside of the annular cylinder ink tank and docked with a diverter ring cylinder, the bottom end of the fixed-angle ink outlet rod extending out of the fixed ring sleeve and protruding from the bottom of the probe body, a pressing pump being arranged inside the annular cylinder ink tank and docked with the inside of the diverter ring cylinder, the fixed-angle ink outlet rod being used for outputting ink and angularly positioning the probe body.

[0006] Furthermore, the fixed-angle ink outlet rod includes a fixed tube, a movable tube is slidably sleeved on the side wall of the fixed tube, the top end of the fixed tube penetrates into the interior of the annular cylinder ink tank and is connected with the interior of the diversion ring cylinder, the top end of the movable tube is transmission-connected to the inner wall of the fixed ring sleeve through a spring, and a locking mechanism is docked inside the fixed tube, and the locking mechanism is used to lock the position of the movable tube.

[0007] Furthermore, the diameter of the fixed tube is smaller than the inner diameter of the movable tube, a sealing ring is fixedly connected to the bottom end of the side wall of the fixed tube, the side wall of the sealing ring is fitted with the inner wall of the movable tube, the side wall of the fixed tube and the inner wall of the movable tube are located at the top of the sealing ring to form an interlayer space a, the locking mechanism includes an inner tube and a swivel, the inner wall of the swivel is connected with a ring seal through a connecting block, a plurality of liquid inlet slots are provided on the inner wall of the ring seal, the inner tube is arranged inside the fixed tube, the top end of the inner tube passes through the outside of the fixed tube and fits with the inner wall of the ring seal, the bottom end of the inner tube passes through the outside of the fixed tube and is connected to the interlayer space a, an annular fracture is provided on the outer wall of the annular cylinder ink tank, the swivel is rotatably sleeved at the annular port, and the ring seal is arranged inside the annular cylinder ink tank.

[0008] Furthermore, the side wall of the inner tube is connected to a reflux pipe, and the inner cavity of the reflux pipe is fixedly connected to a one-way valve.

[0009] Furthermore, a pressure valve is fixedly connected to the top of the inner wall of the fixed tube, and the pressure valve includes a sealing plate, a reverse thrust ring is arranged at the bottom of the sealing plate, a valve ball is arranged at the gap between the sealing plate and the reverse thrust ring, the side walls of the sealing plate and the reverse thrust ring are fixedly connected to the inner wall of the fixed tube, a through hole is opened at the bottom of the sealing plate and penetrates to the top of the sealing plate, the inner wall of the through hole fits with the upper surface of the valve ball, and the bottom of the valve ball is transmission connected to the reverse thrust ring through spring three.

[0010] Furthermore, the fixed-angle ink outlet rod also includes a contact shell, which is fixedly connected to the bottom of the movable tube, a ball is arranged inside the contact shell, a through hole b is opened on the top of the contact shell and penetrates into the interior, and the shape of the through hole b matches the shape of the upper surface of the ball, a plurality of liquid grooves are arranged on the inner wall of the through hole b of the contact shell, a through hole c is opened on the bottom of the contact shell and penetrates into the interior, and the shape of the through hole c matches the shape of the lower surface of the ball, and the side wall of the ball is transmission-connected to the top of the inner wall of the contact shell through spring 2.

[0011] Furthermore, the second bottom end of the spring is fixedly connected with a pressure ring, and the second bottom end of the spring is fitted with the side wall of the ball through the pressure ring. Positioning sliders are arranged on both sides of the pressure ring, and vertical sliding grooves adapted to the positioning sliders are arranged on both sides of the inner wall of the contact shell.

[0012] Furthermore, a compressed sponge is arranged at the opening at the bottom end of the moving tube.

[0013] Furthermore, the pressing pump includes a pump housing, both ends of which extend to the back of the diverter ring cylinder and the outside of the annular cylinder ink chamber respectively, an annular piston is slidably sleeved inside the pump housing, one side of the annular piston is transmission-connected to the inner wall of the pump housing through a second check valve, the other side of the annular piston is fixedly connected to a U-shaped frame, one side of the U-shaped frame is fixedly connected to a pressing rod, the pressing rod extends to the outside of the pump housing, a liquid outlet is provided at the bottom of the pump housing, the bottom of the pump housing is located inside the diverter ring cylinder, and a liquid inlet pipe is connected to the side of the annular piston away from spring four, and the liquid inlet pipe and the inner cavity of the annular piston are respectively provided with a first check valve and a second check valve.

[0014] An electromagnetic ultrasonic flaw detection method based on guided wave detection comprises the following steps:

[0015] S1, equipment preparation, start the main machine for debugging, add ink to the annular cylinder ink tank of the probe assembly, and select the appropriate probe assembly and detection parameters according to the material and thickness of the workpiece to be tested;

[0016] S2, detection process, process 1: placing the probe assembly on the surface of the workpiece to be tested, ensuring good acoustic coupling between the probe and the object to be tested;

[0017] Planar workpiece: Place the bottom ends of several fixed-angle ink outlet rods of the probe assembly against the surface of the workpiece;

[0018] Tubular curved workpiece: Unlock the fixed-angle ink outlet rods of the probe assembly by rotating the swivel, and then press the probe assembly downward as a whole to make several fixed-angle ink outlet rods expand and contract, ensuring that the bottom ends of several fixed-angle ink outlet rods respectively contact different points on the curved workpiece for angle positioning, and then reset the swivel to lock the fixed-angle ink outlet rods;

[0019] Process 2: The probe assembly emits a high-power pulse signal to generate ultrasonic waves in the workpiece being measured. The ultrasonic waves propagate in the workpiece being measured and generate reflected waves when encountering defects. The probe assembly receives the reflected waves and processes and analyzes them through the host to determine the location and size of the defects.

[0020] S3: Damage marking: judging whether the workpiece detection position is damaged by the host response data, if there is damage, the pressing pump is pressed to make the bottom ends of several fixed-angle ink outlet rods penetrate ink to dye the workpiece surface to complete the marking, and the next step is carried out when damage is detected;

[0021] S4, slide the probe assembly along the surface of the workpiece to be tested to the downward detection position, and repeat the second process in S2 and S3 until the entire workpiece is detected.

[0022] Technical effects and advantages of the present invention:

[0023] The present invention provides an annular ink tank and a plurality of annularly distributed fixed-angle ink outlet rods on the probe part. When the device detects damage to the workpiece, the ink inside the annular ink tank can be extracted through the plurality of fixed-angle ink outlet rods and the damaged part can be marked (i.e., the position where the damage extends from the inside of the workpiece to the surface). After the flaw detection process is completed, the damaged area can be immediately and conveniently marked, which greatly improves the detection efficiency and the convenience of subsequent processing.

[0024] While the fixed-angle ink outlet rod can mark the damage position, it also has an angle positioning effect on the probe, which is particularly important for inspection objects with significant curved surface characteristics such as tubular workpieces. Traditionally, when the probe is inspecting tubular workpieces, it is difficult to accurately control the angle direction of the probe due to the curved characteristics of its surface, which easily leads to deviation in the inspection position. The angle positioning effect provided by the fixed-angle ink outlet rod can achieve accurate positioning of the probe angle when inspecting curved workpieces, thereby significantly improving the accuracy and reliability of inspection;

[0025] Moreover, at the end of the fixed-angle ink outlet rod, that is, the ink outlet position, the contact shell cooperates with the ball and the spring to automatically seal the ink outlet position of the fixed-angle ink outlet rod to prevent ink leakage when the fixed-angle ink outlet rod is idle. In addition, when the probe needs to be slid along the surface of the workpiece to detect different positions, the ball not only improves the smoothness of the probe sliding, but also reduces the wear on the bottom structure of the fixed-angle ink outlet rod, thereby extending the service life of the equipment and further ensuring the stability and accuracy of the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 For the present invention Figure 1Exploded schematic diagram of the probe assembly structure;

[0028] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure of the annular cylinder ink tank and the fixed ring sleeve;

[0029] Figure 4 For the present invention Figure 3 Schematic diagram of the cross-sectional structure of the moving pipe and the fixed pipe;

[0030] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0032] Figure 7 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the bottom end of the moving tube side wall;

[0033] Figure 8 For the present invention Figure 4 Schematic diagram of the inner tube structure;

[0034] Fig. 9 For the present invention Figure 2 Schematic diagram of the compression pump structure;

[0035] Fig.10 The present invention is a state effect diagram of several fixed-angle ink outlet rods when an electromagnetic ultrasonic flaw detection device based on guided wave detection is applied to a tubular curved surface workpiece.

[0036] The reference numerals are: 1, main machine; 2, probe assembly; 21, probe body; 22, annular cylinder ink tank; 23, fixed ring sleeve; 24, fixed angle ink outlet rod; 25, diverter ring cylinder; 26, pressing pump; 27, locking mechanism; 28, pressure valve; 241, moving tube; 242, fixed tube; 243, spring 1; 244, sealing ring; 245, contact shell; 246, ball; 247, spring 2; 248, pressure ring; 249 , compression sponge; 271, inner tube; 272, swivel; 273, ring seal; 274, connecting block; 275, return pipe; 276, one-way valve; 281, sealing plate; 282, valve ball; 283, thrust ring; 284, spring three; 261, pump housing; 262, annular piston; 263, spring four; 264, U-shaped frame; 265, pressing rod; 266, liquid inlet pipe; 267, check valve one; 268, check valve two. DETAILED DESCRIPTION

[0037] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Reference Figure 1 and Figure 2 The present invention provides an electromagnetic ultrasonic flaw detection device based on guided wave detection, comprising a main body 1, wherein the main body 1 is electrically connected to a probe assembly 2 through a wire, wherein the probe assembly 2 comprises a probe body 21, wherein a side wall of the probe body 21 is fixedly connected to an annular cylinder ink chamber 22, wherein a fixed ring sleeve 23 is fixedly connected to the bottom of the annular cylinder ink chamber 22, wherein a plurality of fixed-angle ink outlet rods 24 are arranged inside the fixed ring sleeve 23, wherein the plurality of fixed-angle ink outlet rods 24 are annularly distributed along the axis of the probe body 21, wherein the bottom ends of the fixed-angle ink outlet rods 24 penetrate into the annular cylinder ink chamber 22 and are docked with a diversion ring cylinder 25, wherein the bottom ends of the fixed-angle ink outlet rods 24 extend out of the fixed ring sleeve 23 and protrude from the bottom of the probe body 21, wherein a pressing pump 26 is arranged inside the annular cylinder ink chamber 22 and is docked with the inside of the diversion ring cylinder 25, wherein the fixed-angle ink outlet rods 24 are used for outputting ink and for angularly positioning the probe body 21.

[0039] During use, a number of fixed-angle ink outlet rods 24 are pressed against the surface of the workpiece, and ink is stored in the annular cylinder ink chamber 22. When the probe body 21 detects that the workpiece is damaged, the ink inside the annular cylinder ink chamber 22 is extracted by the pressing pump 26 and output to the inside of the diversion ring cylinder 25. The ink is diverted inside the diversion ring cylinder 25 and enters the interior of a number of fixed-angle ink outlet rods 24 respectively. The ink output by the number of fixed-angle ink outlet rods 24 is stained on the surface of the workpiece. Due to the distribution position of the number of fixed-angle ink outlet rods 24, the output ink can form a ring mark at the damaged part of the workpiece, thereby achieving the effect of accurately marking the damaged position. When targeting a tubular workpiece, the number of fixed-angle ink outlet rods 24 are pressed against different points on the curved surface of the workpiece, so as to form an angle positioning for the probe assembly 2, so as to avoid excessive angle deviation of the probe assembly 2 affecting the detection accuracy during the detection process and when performing sliding displacement detection along the curved workpiece.

[0040] Reference Figure 3 The fixed-angle ink outlet rod 24 includes a fixed tube 242, and a movable tube 241 is slidably sleeved on the side wall of the fixed tube 242. The top end of the fixed tube 242 penetrates into the interior of the annular cylinder ink chamber 22 and is connected to the inside of the diversion ring cylinder 25. The top end of the movable tube 241 is transmission-connected to the inner wall of the fixed ring sleeve 23 through a spring 243. A locking mechanism 27 is docked inside the fixed tube 242, and the locking mechanism 27 is used to lock the position of the movable tube 241.

[0041] The fixed-angle ink outlet rod 24 is telescopic by the connection between the movable tube 241 and the fixed tube 242. When the device is used for detecting a tubular workpiece, the fixed-angle ink outlet rod 24 is pressed against the curved surface of the workpiece and the probe assembly 2 is pressed downward as a whole. The fixed-angle ink outlet rod 24 will be telescopic due to the pressure. Since the heights of the points on the curved surface are different, the fixed-angle ink outlet rods 24 are telescopic to different lengths, and their bottom ends are respectively pressed against different points on the curved surface of the workpiece [as shown in the attached figure]. Fig.10[As shown in the figure], and the position of the movable tube 241 is locked by the locking mechanism 27, so as to limit the extension and retraction of the fixed-angle ink outlet rod 24, thereby achieving the angle limiting effect of the probe assembly 2 under the different positioning and supporting effects of the curved surface by a plurality of fixed-angle ink outlet rods 24, and through this angle limiting method, when marking the damage position, a plurality of fixed-angle ink outlet rods 24 can achieve a circular mark even for a curved surface, thereby avoiding the situation where some fixed-angle ink outlet rods 24 cannot contact the curved surface and cause incomplete marking.

[0042] Reference Figure 4 , 5 The diameter of the fixed tube 242 is smaller than the inner diameter of the moving tube 241. The bottom end of the side wall of the fixed tube 242 is fixedly connected with a sealing ring 244. The side wall of the sealing ring 244 fits the inner wall of the moving tube 241. The side wall of the fixed tube 242 and the inner wall of the moving tube 241 are located at the top of the sealing ring 244 to form an interlayer space a. The locking mechanism 27 includes an inner tube 271 and a swivel 272. The inner wall of the swivel 272 is connected with a ring seal 273 through a connecting block 274. The inner wall of the ring seal 273 is provided with a plurality of liquid inlet grooves. The inner tube 271 is arranged inside the fixed tube 242, and its top end passes through the outside of the fixed tube 242 and fits with the inner wall of the ring seal 273. The bottom end of the inner tube 271 passes through the outside of the fixed tube 242 and is connected to the interlayer space a. An annular fracture is opened on the outer wall of the annular cylinder ink cabin 22. The swivel 272 is rotatably sleeved at the annular port, and the ring seal 273 is arranged inside the annular cylinder ink cabin 22.

[0043] Before controlling the extension and retraction of the fixed-angle ink outlet rod 24, the ring seal 273 is driven to rotate by rotating the swivel 272 under the connection effect of the connecting block 274, so that the top of the inner tube 271 is aligned with the liquid inlet groove on the inner wall of the ring seal 273. At this time, the ink inside the annular cylinder ink tank 22 can enter the interlayer space a through the inner tube 271 for filling. When the fixed-angle ink outlet rod 24 is shortened, the movable tube 241 slides upward along the side wall of the fixed tube 242. At this time, the interlayer space a increases and generates suction, so that the ink always fills the interlayer space a and the inside of the inner tube 271. Thereafter, the ring seal 273 is reset by rotating the swivel 272, and the inner wall of the ring seal 273 fits with the top of the inner tube 271 to achieve a sealing effect on the inner tube 271. At this time, the ink in the interlayer space a causes the movable tube 241 to slide up and down to form hydraulic pressure, thereby achieving a telescopic locking effect on the fixed-angle ink outlet rod 24.

[0044] Reference Figure 8 The side wall of the inner tube 271 is connected to a return pipe 275 , and a one-way valve 276 is fixedly connected to the inner cavity of the return pipe 275 .

[0045] When the fixed-angle ink outlet rod 24 is shortened, its internal space is compressed. Under the influence of pressure, the ink inside the fixed-angle ink outlet rod 24 may leak from the bottom end. To avoid this situation, a reflux pipe 275 is provided to connect with the interior of the inner tube 271. When the internal space of the fixed-angle ink outlet rod 24 is reduced, the ink can enter the interior of the inner tube 271 through the reflux pipe 275 and reflux into the annular cylinder ink chamber 22. The one-way valve 276 restricts the ink inside the inner tube 271 from flowing into the fixed-angle ink outlet rod 24.

[0046] Reference Figure 4 , 6 A pressure valve 28 is fixedly connected to the top of the inner wall of the fixed tube 242, and the pressure valve 28 includes a sealing plate 281. A thrust ring 283 is arranged at the bottom of the sealing plate 281. A valve ball 282 is arranged at the gap between the sealing plate 281 and the thrust ring 283. The side walls of the sealing plate 281 and the thrust ring 283 are fixedly connected to the inner wall of the fixed tube 242. A through hole is opened at the bottom of the sealing plate 281 and penetrates to the top of the sealing plate 281. The inner wall of the through hole fits with the upper surface of the valve ball 282. The bottom of the valve ball 282 is transmission connected to the thrust ring 283 through a spring three 284.

[0047] When the flow dividing ring 25 outputs ink to the inside of the plurality of fixed-angle ink outlet rods 24, the ink may be unevenly distributed on the inner walls of the plurality of fixed-angle ink outlet rods 24, resulting in uneven ink discharge from the plurality of fixed-angle ink outlet rods 24 and affecting the marking effect. By setting the pressure valve 28, the ink entering the plurality of fixed-angle ink outlet rods 24 can be required to reach a specific pressure value, thereby avoiding the uneven ink inside the plurality of fixed-angle ink outlet rods 24. In addition, the structural setting of the pressure valve 28 can also achieve a one-way flow limiting effect, thereby avoiding the fixed-angle ink outlet rods 24 from being unevenly distributed. The ink inside the ink rod 24 flows back to the inside of the diverter ring tube 25. When in use, when the ink inside the diverter ring tube 25 reaches a certain pressure value, it forms a resistance effect on the valve ball 282. At this time, the valve ball 282 moves downward and compresses the spring three 284. At this time, a gap is formed between the upper surface of the valve ball 282 and the perforation of the sealing plate 281, and the ink flows downward into the fixed tube 242. When the ink enters the fixed tube 242 and flows upward, it will resist the valve ball 282 and cooperate with the elastic force of the spring three 284 to achieve the effect of limiting the backflow.

[0048] Reference Figure 7 The fixed-angle ink outlet rod 24 also includes a contact shell 245, which is fixedly connected to the bottom of the moving tube 241. A ball 246 is arranged inside the contact shell 245. A through hole b is opened at the top of the contact shell 245 and penetrates into the interior, and the shape of the through hole b matches the shape of the upper surface of the ball 246. A plurality of liquid grooves are arranged on the inner wall of the through hole b of the contact shell 245. A through hole c is opened at the bottom of the contact shell 245 and penetrates into the interior, and the shape of the through hole c matches the shape of the lower surface of the ball 246. The side wall of the ball 246 is transmission-connected to the top of the inner wall of the contact shell 245 through a spring 247.

[0049] When the fixed-angle ink outlet rod 24 is in an idle state, the elastic force of the spring 247 causes the ball 246 to press against the inner wall of the through hole c to form a blockage, thereby preventing the ink inside the fixed-angle ink outlet rod 24 from leaking when in an idle state. During use, since the bottom end of the fixed-angle ink outlet rod 24 needs to press against the surface of the workpiece, the ball 246 is forced to move upward and press against the inner wall of the through hole b. The upward movement distance of the ball 246 is limited by the through hole b, and the ball 246 is radially positioned to prevent it from shifting. At this time, a gap is formed between the ball 246 and the through hole c for ink to pass through. In addition, the liquid groove on the inner wall of the through hole b can prevent the through hole b from being blocked by the ball 246. When the probe needs to slide on the surface of the workpiece to change the detection position, the friction resistance can be reduced by the rolling of the ball 246.

[0050] Reference Figure 7 The bottom end of the spring 247 is fixedly connected with a pressing ring 248, and the bottom end of the spring 247 is fitted with the side wall of the ball 246 through the pressing ring 248. Positioning sliders are arranged on both sides of the pressing ring 248, and vertical sliding grooves adapted to the positioning sliders are arranged on both sides of the inner wall of the contact shell 245.

[0051] Since the ball 246 can easily twist and damage the spring 247 when rolling, a pressure ring 248 is provided to connect with the spring 247, and the position and angle of the pressure ring 248 are limited by the vertical slide groove and the positioning slider, thereby protecting the spring 247 and avoiding damage to the spring 247 caused by the rolling of the ball 246.

[0052] Reference Figure 7 A compressed sponge 249 is provided at the bottom opening of the moving tube 241 .

[0053] By providing the compressed sponge 249, a certain resistance can be provided when the ink enters the contact shell 245, thereby preventing the ink from leaking when the ball 246 moves upward without controlling the pressing pump 26. In addition, when the fixed-angle ink outlet rod 24 contracts, the ink does not flow back through the reflux pipe 275 under the influence of pressure, but directly leaks to the bottom end of the fixed-angle ink outlet rod 24.

[0054] Reference Fig. 9The pressing pump 26 includes a pump housing 261, and both ends of the pump housing 261 extend to the back of the diverter ring cylinder 25 and the outside of the annular cylinder ink cabin 22 respectively. An annular piston 262 is slidably sleeved inside the pump housing 261, and one side of the annular piston 262 is transmission-connected to the inner wall of the pump housing 261 through a second check valve 268. A U-shaped frame 264 is fixedly connected to the other side of the annular piston 262, and a pressing rod 265 is fixedly connected to one side of the U-shaped frame 264. The pressing rod 265 extends to the outside of the pump housing 261. The bottom of the pump housing 261 is located inside the diverter ring cylinder 25 and is provided with a liquid outlet. The bottom of the pump housing 261 is located on the side of the annular piston 262 away from the spring four 263 and is connected to a liquid inlet pipe 266. The liquid inlet pipe 266 and the inner cavity of the annular piston 262 are respectively provided with a first check valve 267 and a second check valve 268.

[0055] When in use, the annular piston 262 is displaced by pressing the pressing rod 265, and suction is generated by the piston principle. The ink inside the annular cylinder ink chamber 22 is sucked into the pump housing 261 through the liquid inlet pipe 266, and then the annular piston 262 is reset by the elastic force of the spring four 263. Since the inner cavity of the annular piston 262 is equipped with a check valve two 268, when the annular piston 262 is reset, the ink inside the pump housing 261 will smoothly enter the diverter ring cylinder 25 through the check valve two 268 and the liquid outlet at the bottom of the pump housing 261.

[0056] An electromagnetic ultrasonic flaw detection method based on guided wave detection comprises the following steps:

[0057] S1, equipment preparation, start up and debug the host 1, add ink to the annular cylinder ink tank 22 of the probe assembly 2, and select a suitable probe assembly 2 and detection parameters according to the material and thickness of the workpiece to be tested;

[0058] S2, detection process, process 1: placing the probe assembly 2 on the surface of the workpiece to be measured, ensuring good acoustic coupling between the probe and the object to be measured;

[0059] Planar workpiece: Place the bottom ends of several fixed-angle ink outlet rods 24 of the probe assembly 2 against the surface of the workpiece;

[0060] Tubular curved workpiece: Unlock the fixed-angle ink outlet rod 24 of the probe assembly 2 by rotating the swivel 272, and then press the probe assembly 2 downward as a whole to make the fixed-angle ink outlet rods 24 extend and retract, ensuring that the bottom ends of the fixed-angle ink outlet rods 24 respectively contact different points of the curved workpiece for angular positioning, and then reset the swivel 272 to lock the fixed-angle ink outlet rods 24;

[0061] Process 2: A high-power pulse signal is emitted through the probe assembly 2 to generate ultrasonic waves in the workpiece being measured. The ultrasonic waves propagate in the workpiece being measured and generate reflected waves when encountering defects. The probe assembly 2 receives the reflected waves and processes and analyzes them through the host 1 to determine the location and size of the defects.

[0062] S3: Damage marking, judging whether the workpiece detection position is damaged by the response data of the host 1, if there is damage, the pressing pump 26 is pressed to make the bottom ends of the fixed-angle ink outlet rods 24 penetrate ink to dye the workpiece surface to complete the marking, and the next step is carried out when damage is detected;

[0063] S4, slide the probe assembly 2 along the surface of the workpiece to be tested to the downward detection position, and repeat the second process in S2 and S3 until the entire workpiece is detected.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. 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. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electromagnetic ultrasonic flaw detection device based on guided wave detection, comprising a host (1), wherein the host (1) is electrically connected to a probe assembly (2) via a wire, and wherein: The probe assembly (2) comprises a probe body (21), a side wall of the probe body (21) is fixedly connected to an annular cylindrical ink tank (22), a bottom of the annular cylindrical ink tank (22) is fixedly connected to a fixed ring sleeve (23), a plurality of fixed-angle ink outlet rods (24) are arranged inside the fixed ring sleeve (23), and the plurality of fixed-angle ink outlet rods (24) are distributed in an annular manner along the axis of the probe body (21); The bottom end of the fixed-angle ink outlet rod (24) penetrates into the interior of the annular cylinder ink chamber (22) and is connected to a diverter ring cylinder (25); the bottom end of the fixed-angle ink outlet rod (24) extends out of the fixed ring sleeve (23) and protrudes from the bottom of the probe body (21); a pressing pump (26) is provided inside the annular cylinder ink chamber (22) and is connected to the interior of the diverter ring cylinder (25); the fixed-angle ink outlet rod (24) is used to output ink and to perform angle positioning on the probe body (21); The fixed-angle ink outlet rod (24) comprises a fixed tube (242), a side wall of the fixed tube (242) being slidably sleeved with a movable tube (241), a top end of the fixed tube (242) penetrating into the interior of the annular cylinder ink chamber (22) and connected to the interior of the diverter annular cylinder (25), a top end of the movable tube (241) being transmission-connected to the inner wall of the fixed annular sleeve (23) via a spring 1 (243), a locking mechanism (27) being butt-jointed with the interior of the fixed tube (242), and the locking mechanism (27) being used to lock the position of the movable tube (241); The diameter of the fixed tube (242) is smaller than the inner diameter of the movable tube (241); a sealing ring (244) is fixedly connected to the bottom end of the side wall of the fixed tube (242); the side wall of the sealing ring (244) is in contact with the inner wall of the movable tube (241); the side wall of the fixed tube (242) and the inner wall of the movable tube (241) are located at the top of the sealing ring (244) to form an interlayer space a; The locking mechanism (27) comprises an inner tube (271) and a rotating ring (272); the inner wall of the rotating ring (272) is connected to a ring seal (273) via a connecting block (274); the inner wall of the ring seal (273) is provided with a plurality of liquid inlet slots; the inner tube (271) is arranged inside the fixed tube (242); the top end of the inner tube (271) passes through the outside of the fixed tube (242) and fits the inner wall of the ring seal (273); the bottom end of the inner tube (271) passes through the outside of the fixed tube (242) and communicates with the interlayer space a; the outer wall of the annular cylinder ink chamber (22) is provided with an annular fracture; the rotating ring (272) is rotatably sleeved at the annular port; and the ring seal (273) is arranged inside the annular cylinder ink chamber (22); The pressing pump (26) comprises a pump housing (261), the two ends of the pump housing (261) respectively extending to the back of the diverter ring cylinder (25) and the outside of the annular cylinder ink chamber (22), an annular piston (262) is slidably sleeved inside the pump housing (261), one side of the annular piston (262) is drivingly connected to the inner wall of the pump housing (261) via a second check valve (268), and the other side of the annular piston (262) is fixedly connected to a U-shaped frame (264), and the U-shaped frame (264) is A pressing rod (265) is fixedly connected to the side of the pump housing (261), and the pressing rod (265) extends to the outside of the pump housing (261). The bottom of the pump housing (261) is located inside the diverter ring tube (25) and is provided with a liquid outlet. The bottom of the pump housing (261) is located on the side of the annular piston (262) away from the spring four (263) and is connected to a liquid inlet pipe (266). The liquid inlet pipe (266) and the inner cavity of the annular piston (262) are respectively provided with a check valve one (267) and a check valve two (268).

2. The electromagnetic ultrasonic flaw detection device based on guided wave detection according to claim 1 is characterized in that: The side wall of the inner tube (271) is connected to a return pipe (275), and the inner cavity of the return pipe (275) is fixedly connected to a one-way valve (276).

3. The electromagnetic ultrasonic flaw detection device based on guided wave detection according to claim 1 is characterized in that: A pressure valve (28) is fixedly connected to the top of the inner wall of the fixed tube (242), and the pressure valve (28) includes a sealing plate (281). A reverse thrust ring (283) is arranged at the bottom of the sealing plate (281). A valve ball (282) is arranged at the gap between the sealing plate (281) and the reverse thrust ring (283). The side walls of the sealing plate (281) and the reverse thrust ring (283) are fixedly connected to the inner wall of the fixed tube (242). A through hole is opened at the bottom of the sealing plate (281) and penetrates to the top of the sealing plate (281). The inner wall of the through hole fits with the upper surface of the valve ball (282), and the bottom of the valve ball (282) is transmission-connected to the reverse thrust ring (283) via a spring three (284).

4. The electromagnetic ultrasonic flaw detection device based on guided wave detection according to claim 1 is characterized in that: The fixed-angle ink outlet rod (24) further comprises a contact shell (245), wherein the contact shell (245) is fixedly connected to the bottom of the movable tube (241), a ball (246) is arranged inside the contact shell (245), a through hole b penetrating to the inside is provided at the top of the contact shell (245), and the shape of the through hole b matches the shape of the upper surface of the ball (246), a plurality of liquid passage grooves are provided on the inner wall of the through hole b of the contact shell (245), a through hole c penetrating to the inside is provided at the bottom of the contact shell (245), and the shape of the through hole c matches the shape of the lower surface of the ball (246), and the side wall of the ball (246) is transmission-connected to the top of the inner wall of the contact shell (245) via a second spring (247).

5. The electromagnetic ultrasonic flaw detection device based on guided wave detection according to claim 4 is characterized in that: The bottom end of the second spring (247) is fixedly connected to a pressure ring (248), and the bottom end of the second spring (247) is fitted with the side wall of the ball (246) through the pressure ring (248). Positioning slide blocks are arranged on both sides of the pressure ring (248), and vertical slide grooves adapted to the positioning slide blocks are arranged on both sides of the inner wall of the contact housing (245).

6. The electromagnetic ultrasonic flaw detection device based on guided wave detection according to claim 4, characterized in that: A compressed sponge (249) is provided at the bottom opening of the moving tube (241).

7. An electromagnetic ultrasonic flaw detection method based on guided wave detection, using an electromagnetic ultrasonic flaw detection device based on guided wave detection as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1, equipment preparation, starting and debugging the main machine (1), adding ink to the annular cylinder ink tank (22) of the probe assembly (2), and selecting a suitable probe assembly (2) and detection parameters according to the material and thickness of the workpiece to be measured; S2, detection process, process 1: placing the probe assembly (2) on the surface of the workpiece to be tested, ensuring good acoustic coupling between the probe and the object to be tested; Planar workpiece: the bottom ends of a plurality of fixed-angle ink outlet rods (24) of the probe assembly (2) are placed against the surface of the workpiece; Tubular curved workpiece: the fixed-angle ink outlet rod (24) of the probe assembly (2) is unlocked by rotating the rotating ring (272), and then the probe assembly (2) is pressed downward as a whole to cause the plurality of fixed-angle ink outlet rods (24) to extend and retract, ensuring that the bottom ends of the plurality of fixed-angle ink outlet rods (24) respectively contact different points on the curved workpiece for angular positioning, and then the rotating ring (272) is reset to lock the fixed-angle ink outlet rods (24); Process 2: A high-power pulse signal is emitted through the probe assembly (2) to generate ultrasonic waves in the workpiece being measured. The ultrasonic waves propagate in the workpiece being measured and generate reflected waves when encountering defects. The probe assembly (2) receives the reflected waves and processes and analyzes them through the host (1) to determine the location and size of the defects. S3: Damage marking, judging whether the workpiece detection position is damaged by the response data of the host (1), and if damaged, the pressing pump (26) is pressed to make the bottom ends of the fixed-angle ink outlet rods (24) penetrate ink to dye the surface of the workpiece to complete the marking, and the next step is carried out when damage is detected; S4, sliding the probe assembly (2) along the surface of the workpiece to be tested to a downward detection position, and repeating the second process in S2 and S3 until the entire workpiece is detected.

Images