A mechanism for improving the stability of ultrasonic probe wheel detection of pipes

Abstract

The present invention discloses a mechanism for improving the detection stability of an ultrasonic probe wheel for pipes, which belongs to the technical field of ultrasonic flaw detection and comprises a base plate; a suspension plate is floatingly connected to the bottom of the base plate through a suspension assembly; a wheel axle is horizontally arranged below the suspension plate, a probe wheel body is rotatably sleeved on the wheel axle, the interior of the probe wheel body is filled with coupling agent, and sealing assemblies are arranged at the connections between the two ends of the probe wheel body and the wheel axle; an ultrasonic probe is arranged in the probe wheel body, and the present invention enables the suspension plate to float relative to the base plate through the cooperation of multiple guide rods and springs in the suspension assembly, and when the base plate is pressed toward the pipe wall, the suspension plate can flexibly adjust its position to drive the probe wheel body to contact the pipe surface, and this floating enhances the adaptability of the mechanism to pipe surfaces of different shapes and unevenness, ensures that the probe wheel body effectively fits the pipe, and maintains a constant distance between the ultrasonic probe and the pipe surface through the coordinated action of the guide wheel and the wheel skin, thereby reducing detection errors.

Description

Technical Field

[0001] The invention relates to a mechanism for improving the detection stability of an ultrasonic flaw detection wheel for pipes, and belongs to the technical field of ultrasonic flaw detection. Background Art

[0002] In the field of pipe inspection, especially when conducting ultrasonic flaw detection on non-round and uneven pipes, many technical difficulties are faced. On the one hand, due to the irregular shape and uneven surface of the pipe, traditional detection mechanisms are difficult to achieve effective contact with the pipe surface, resulting in unstable contact between the probe wheel and the pipe during the inspection process, and unable to ensure the stability of the coupling distance between the ultrasonic probe and the pipe surface. As a result, the test results are easily affected by height changes, resulting in large detection errors, seriously affecting the accuracy and reliability of ultrasonic testing, reducing the quality and efficiency of testing, and making it difficult to meet the demand for accurate detection of non-round and uneven pipes. Therefore, a mechanism for improving the stability of ultrasonic probe wheel detection of pipes is proposed. Summary of the Invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a mechanism for improving the stability of ultrasonic detection of pipes, thereby improving the stability during flaw detection, avoiding detection errors caused by height changes, and ensuring the accuracy and reliability of ultrasonic detection.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a mechanism for improving the stability of ultrasonic probe wheel detection of pipes, comprising:

[0005] substrate;

[0006] A suspension plate, wherein the suspension plate is floatingly connected below the base plate through a suspension component;

[0007] Two support arms, the two support arms are symmetrically fixed on both sides of the suspension board;

[0008] A wheel axle, the wheel axle is arranged horizontally below the suspension board, and both ends of the wheel axle are respectively fixed to the support arms on the same side;

[0009] A probe wheel body, the probe wheel body rotates on the wheel axle, the interior of the probe wheel body is filled with coupling agent, and the connection between the two ends of the probe wheel body and the wheel axle is provided with a sealing component for preventing the coupling agent from leaking;

[0010] Wherein, an ultrasonic probe is provided in the detection wheel body, and the ultrasonic probe is fixed in the middle of the wheel axle.

[0011] Preferably, the suspension assembly includes a plurality of guide rods, the upper ends of which are fixedly connected to the base plate, and the lower ends of which pass through the suspension plate and are fixed with nuts; a spring is sleeved on each guide rod, the upper end of which abuts against the base plate, and the lower end of which abuts against the upper surface of the suspension plate.

[0012] Preferably, limiting rods are fixed on both sides of the base plate, a sliding groove is provided on the support arm, and the lower end of the limiting rod is slidably connected to the inside of the sliding groove.

[0013] Preferably, the wheel probe body is provided with a wheel skin made of rubber material, the lower ends of the two support arms are fixedly connected to a cross rod, a rolling element is fixed on the cross rod, and the lower edge of the rolling element is higher than the lower edge of the wheel probe body.

[0014] Preferably, a front liquid pipe is fixed to the front side of the suspension plate, and a rear liquid pipe is fixed to the rear side of the suspension plate. Both the front liquid pipe and the rear liquid pipe are provided with flat-mouth nozzles, and the flat-mouth nozzles face the surface of the wheel skin.

[0015] Preferably, the sealing assembly comprises:

[0016] An inner end cover, the inner end cover is fixed to the end of the probe wheel body by bolts, and a recessed groove is formed on the side wall of the inner end cover;

[0017] A sealing ring fixed inside the sink, the sealing ring is provided with a sealing lip, and the sealing lip is provided with a first pressing portion pressed against the surface of the wheel shaft to form a primary seal;

[0018] A plurality of spring-pressing sheets are circumferentially distributed between the sealing ring and the sealing lip, and are used to press the sealing lip toward the surface of the wheel axle.

[0019] Preferably, a pressing piece is fixed to one end of the elastic pressing piece close to the wheel axle, and a flexible thin-walled portion is provided on one end of the elastic pressing piece close to the wheel axle. The end of the pressing piece is bent to form a pressing portion, and the pressing portion is in close contact with the sealing lip.

[0020] Wherein, a first annular wall is provided on the wheel axle, and the bent portion of the pressing plate abuts against the first annular wall.

[0021] Preferably, a pressure equalizing plate is provided between the elastic pressure piece and the sealing lip.

[0022] Preferably, an inner ring is provided on the sealing ring, a plurality of second abutting portions are fixed on the surface of the inner ring, a second ring wall is provided on the wheel axle, and the plurality of second abutting portions abut against the second ring wall to form a secondary seal.

[0023] Preferably, outer end covers are fixed to both ends of the wheel probe body, bearings are fixed on the outer end covers, and the wheel axle is sleeved on the inner ring of the bearing.

[0024] Compared with existing technologies:

[0025] 1. The present invention utilizes the coordination of multiple guide rods and springs in the suspension assembly to allow the suspension plate to float relative to the base plate. When the base plate is pressed down toward the pipe wall, the suspension plate can flexibly adjust its position, driving the probe wheel body to contact the pipe surface. This floating mechanism enhances the adaptability of the mechanism to pipe surfaces of different shapes and unevenness, ensuring that the probe wheel body and the pipe are effectively fitted. The rubber wheel skin on the probe wheel body not only acts as a buffer when in contact with the pipe surface, protecting the pipe from damage, but also compresses and deforms, allowing the lower edge of the rolling element to contact the pipe surface. The synergistic action of the rolling element and the wheel skin maintains a constant distance between the ultrasonic probe and the pipe surface, reducing detection errors.

[0026] 2. The present invention improves the sealing performance through a multi-stage sealing design. The first pressing part on the sealing lip contacts the surface of the wheel axle to form a primary seal, and the provision of the spring-loaded sheet further enhances the fit between the sealing lip and the wheel axle. Through the resetting action of the spring-loaded sheet, the first pressing part is always tightly pressed against the surface of the wheel axle, effectively preventing the coupling agent from leaking. In addition, the multiple concentric second pressing parts on the inner ring of the sealing ring press against the second ring wall on the wheel axle to form a secondary seal, further enhancing the sealing performance. The multi-stage sealing structures cooperate with each other to effectively prevent the coupling agent from leaking at the connection between the probe wheel body and the wheel axle, thereby ensuring the stability and accuracy of ultrasonic probe wheel detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0029] Figure 3 For the present invention Figure 2 Enlarged view of point A.

[0030] Figure 4 It is a cross-sectional exploded view of the wheel axle, the wheel probe body, the inner end cover, the sealing ring and the outer end cover of the present invention.

[0031] Figure 5 It is a cross-sectional view of the sealing ring and the sealing lip of the present invention.

[0032] Figure 6 For the present invention Figure 5 Enlarged view of point B.

[0033] Figure 7 It is a cross-sectional view of the wheel shaft, sealing ring, sealing lip and elastic pressure piece of the present invention.

[0034] Figure 8 It is a structural schematic diagram of the front liquid pipe, rear liquid pipe and probe wheel body of the present invention.

[0035] Figure 9 This is a schematic diagram of the present invention when detecting the inner wall state of a pipe.

[0036] Figure 10 This is a schematic diagram of the present invention when detecting the outer wall state of a pipe.

[0037] Figure 11 This is a waveform diagram of the present invention when detecting the standard state.

[0038] Figure 12 This is a schematic diagram of the waveform and changes when detecting pipe out of roundness according to the present invention.

[0039] Figure 13 This is a schematic diagram of the waveform and changes when detecting uneven thickness of pipes according to the present invention.

[0040] Figure 14 This is a schematic diagram of the robot arm driving the device to detect the inner wall status of the pipe.

[0041] Figure 15 This is a schematic diagram of the robot arm driving the device to detect the outer wall status of the pipe.

[0042] In the picture:

[0043] 1. Base plate, 2. Suspension plate;

[0044] 3. Suspension assembly, 301, guide rod, 302, nut, 303, spring;

[0045] 4. Support arm, 401, chute;

[0046] 5. Axle;

[0047] 501, first ring wall, 5011, convex edge, 502, second ring wall, 503, wire trough, 504, water trough;

[0048] 6. Probe wheel body, 601, wheel skin;

[0049] 7. Sealing components;

[0050] 701, inner end cover, 7011, sink, 702, sealing ring, 7021, sealing lip, 7022, first abutting portion, 7023, inner ring, 7024, second abutting portion, 703, spring-pressing piece, 7031, top pressure piece, 7032, flexible thin-walled portion, 704, equalizing plate;

[0051] 8. Ultrasonic probe;

[0052] 9. Limiting rod, 10. Cross support rod, 11. Rolling element;

[0053] 12. front liquid pipe, 13. rear liquid pipe;

[0054] 14. Outer end cover, 15. Bearing;

[0055] 16. Water pipe, 17. One-way valve. DETAILED DESCRIPTION

[0056] The present invention is described below with specific examples, but is not intended to be limiting of the invention.

[0057] Example 1

[0058] like Figures 1-15 As shown, in this embodiment, a mechanism for improving the stability of ultrasonic probe wheel detection of pipes is provided, including a base plate 1 installed at the end of a robotic arm, as shown in FIG. Figure 13 and Figure 14 As shown, the substrate 1 can be flexibly and stably controlled to move by the driving action of the robotic arm, and a suspension plate 2 is floatingly connected to the bottom of the substrate 1 through a suspension component 3; two support arms 4 are symmetrically fixed on both sides of the suspension plate 2; a wheel axle 5 is horizontally arranged below the suspension plate 2, and the two ends of the wheel axle 5 are respectively fixed on the support arms 4 on the same side; a probe wheel body 6 rotates on the wheel axle 5, and the interior of the probe wheel body 6 is filled with coupling agent, and the connection between the two ends of the probe wheel body 6 and the wheel axle 5 is provided with a sealing component 7 for preventing the leakage of the coupling agent; wherein, an ultrasonic probe 8 is arranged in the probe wheel body 6, and the ultrasonic probe 8 is fixed to the middle part of the wheel axle 5, as shown in FIG. Figure 2 As shown, a cavity for installing an ultrasonic probe 8 is provided in the middle of the wheel axle 5, and the opening of the cavity faces downward. When the ultrasonic probe 8 is installed inside the cavity, the ultrasonic probe 8 is installed downward to realize detection of the pipe wall directly below the probe wheel body 6.

[0059] like Figure 1-Figure 3 As shown, a wire groove 503 is provided at one end of the axle 5, and the guide wired through the wire groove 503 can realize the electrical signal connection between the ultrasonic probe 8 and the external controller;

[0060] A water trough 504 is provided at the other end of the wheel axle 5. The inner end of the water trough 504 is connected to the inner cavity of the wheel probe body 6. The outer end of the water trough 504 is connected to a water pipe 16. The water pipe 16 and the water trough 504 can inject coupling agent into the wheel probe body 6. A one-way valve 17 is connected to the water pipe 16, which can make the coupling agent flow into the wheel probe body 6 in one direction and seal the coupling agent in the wheel probe body 6.

[0061] Outer end covers 14 are fixed to both ends of the wheel probe body 6 , bearings 15 are fixed to the outer end covers 14 , and the wheel axle 5 is sleeved on the inner ring of the bearing 15 .

[0062] Example 2

[0063] like Figure 1 and Figure 2 as well as Figures 9-15As shown, based on the first embodiment, in this embodiment, the suspension assembly 3 includes a plurality of guide rods 301, the upper ends of the plurality of guide rods 301 are fixedly connected to the base plate 1, and the lower ends of the plurality of guide rods 301 pass through the suspension board 2 and are fixed with nuts 302; each guide rod 301 is sleeved with a spring 303, the upper end of the spring 303 abuts against the base plate 1, and the lower end of the spring 303 abuts against the upper surface of the suspension board 2.

[0064] Limiting rods 9 are fixed on both sides of the base plate 1, and a slide groove 401 is provided on the support arm 4. The lower end of the limiting rod 9 is slidably connected to the inside of the slide groove 401, which limits the movement direction of the support arm 4 so that it can only move in the vertical direction, effectively preventing the detection wheel body 6 from shaking left and right during the detection process, thereby ensuring the stability of the detection.

[0065] A rubber wheel skin 601 is provided on the wheel probe body 6. The lower ends of the two support arms 4 are fixedly connected to a cross rod 10. A rolling member 11 is fixed to the cross rod 10. The lower edge of the rolling member 11 is higher than the lower edge of the wheel probe body 6. The rolling member 11 can be in the form of a guide wheel, a ball bearing, etc., and the guide wheel will be described below.

[0066] When the probe wheel body 6 starts to detect the pipe, the base plate 1 is pressed down toward the wall of the pipe. First, the wheel skin 601 of the probe wheel body 6 is pressed down to fit the surface of the pipe and form a certain contact area. After applying a certain pressure, the wheel skin 601 is compressed and deformed, so that the lower edge of the guide wheel contacts the surface of the pipe. Through the limitation of the guide wheel, a stable height difference can be formed between the ultrasonic probe 8 and the surface of the pipe during flaw detection, thereby improving the stability during flaw detection.

[0067] A front liquid pipe 12 is fixed on the front side of the suspension plate 2, and a rear liquid pipe 13 is fixed on the rear side of the suspension plate 2. Both the front liquid pipe 12 and the rear liquid pipe 13 are provided with flat-mouth nozzles, which face the surface of the wheel skin 601. The coupling liquid is sprayed on the surface of the wheel skin 601 through the flat-mouth nozzle to achieve wetting of the contact between the surface of the wheel skin 601 and the surface of the steel pipe, thereby avoiding the formation of gaps between the surface of the wheel skin 601 and the steel pipe to meet the coupling conditions.

[0068] The ultrasonic probe 8 transmits an ultrasonic signal, which passes through the coupling agent and the wheel skin 601 to reach the pipe wall. The reflected signal is received by the ultrasonic probe 8 and the electrical signal is transmitted to the external controller through the wire in the wire groove 503 to realize the detection of the pipe wall.

[0069] During flaw detection, the probe wheel needs to be in a stable state and move with the pipe body. Therefore, its floating changes need to be balanced due to the influence of the pipe's out-of-roundness and uneven thickness. The calculation method of floating balance is as follows:

[0070] When the probe wheel body 6 starts to detect the pipe, it must first press the probe wheel body 6 down to fit the pipe surface and form a certain contact area, which means that the specified coaxial height H (such as Figure 9-10 As shown in the figure), tire pressure S is generated at this time. The difference between gravity g and tire pressure S is the variable thrust f. When the distance between the position where the probe wheel contacts the tube body and the fixed position of the detection beam (arm) increases to X, the thrust f decreases, and vice versa.

[0071] Where g represents the gravity of the mechanism (overall weight);

[0072] S represents the tire pressure generated by the wheel probe body 6 being compressed;

[0073] f represents thrust (the difference between gravity g and tire pressure S, a dynamic value);

[0074] H represents the coaxial height measurement (the distance between the axis 6 of the probe wheel body and the lower edge of the guide wheel during detection);

[0075] X represents the distance variable between the probe wheel contacting the pipe body and the fixed position of the detection beam (arm) (e.g. Figure 9 As shown, pipe material error);

[0076] Figure 9 , is a schematic diagram of the inner wall state of the pipe being tested, where B represents the distance between the base plate 1 and the suspension plate 2 after the spring 303 is compressed when testing a standard pipe; A represents the distance between the base plate 1 and the lower edge of the guide wheel after the spring 303 is compressed when testing a standard pipe; B+X represents the change in the distance between the base plate 1 and the suspension plate 2 when testing an out-of-round pipe; and A+X represents the change in the distance between the base plate 1 and the lower edge of the guide wheel when testing an out-of-round pipe.

[0077] Figure 10 , is a schematic diagram of the outer wall state of the pipe inspection, where B represents the distance between the base plate 1 and the suspension plate 2 after the spring 303 is compressed when inspecting a standard pipe; A represents the distance between the base plate 1 and the lower edge of the guide wheel after the spring 303 is compressed when inspecting a standard pipe; BY represents the change in the distance between the base plate 1 and the suspension plate 2 when inspecting an out-of-round pipe; and AY represents the change in the distance between the base plate 1 and the lower edge of the guide wheel when inspecting an out-of-round pipe.

[0078] Figure 11-13 In the figure, h1 represents the distance between the ultrasonic probe surface and the pipe surface under the condition of an ideal circle. h2 represents the distance between the ultrasonic probe surface and the pipe surface when the pipe is not round. h3 represents the distance between the ultrasonic probe surface and the pipe surface when the pipe thickness is uneven.

[0079] T represents the emission wave, G represents the tube wall wave, F represents the defect wave, and J represents the interface wave;

[0080] J1 and J2 represent the floating of interface waves when the pipe is not round;

[0081] G1 and G2 represent the floating of the pipe wall surface wave when the pipe thickness is uneven.

[0082] Example 3

[0083] like Figure 2-Figure 7 As shown, on the basis of the above embodiment, in this embodiment, the sealing assembly 7 includes an inner end cover 701, which is fixed to the end of the probe wheel body 6 by bolts, and a recessed groove 7011 is provided on the side wall of the inner end cover 701; a sealing ring 702 is fixed inside the recessed groove 7011, and the outer wall of the sealing ring 702 and the recessed groove 7011 can be fixed by adhesive, and a sealing lip 7021 is provided on the sealing ring 702, and the sealing lip 7021 is provided with a first pressing portion 7022 that presses against the surface of the wheel shaft 5 to form a primary seal; a plurality of spring-pressing sheets 703 are circumferentially distributed between the sealing ring 702 and the sealing lip 7021, and the spring-pressing sheets 703 are arranged in a V shape, one side of the spring-pressing sheet 703 is fixed to the inner wall of the sealing ring 702, and the other side of the spring-pressing sheet 703 is fixed to the outer wall of the sealing lip 7021, for pressing the sealing lip 7021 toward the surface of the wheel shaft 5;

[0084] When the sealing ring 702 is sleeved on the axle 5, the axle 5 contacts the first pressing portion 7022 of the sealing lip 7021, and the axle 5 supports the sealing lip 7021, causing the spring-pressing plate 703 to deform, and the V-shaped mouth of the spring-pressing plate 703 is deformed and reduced. The sealing lip 7021 is spring-pressed by the resetting action of the spring-pressing plate 703, so that the first pressing portion 7022 can be pressed against the surface of the axle 5.

[0085] A top pressure piece 7031 is fixed to one end of the spring pressure piece 703 close to the wheel axle 5. The spring pressure piece 703 and the top pressure piece 7031 are integrally formed. A flexible thin-walled portion 7032 is provided at one end of the top pressure piece 7031 close to the spring pressure piece 703. The thickness of the flexible thin-walled portion 7032 is thinner than the thickness of the top pressure piece 7031 and the spring pressure piece 703. When the top pressure piece 7031 is subjected to force, the flexible thin-walled portion 7032 can be deformed first, and the end of the top pressure piece 7031 is bent to form a pressing portion, which is in close contact with the sealing lip 7021.

[0086] The axle 5 is provided with a first annular wall 501 , and the bent portion of the top pressure piece 7031 abuts against the first annular wall 501 ;

[0087] In addition, the outer ring of the first annular wall 501 is provided with a convex edge 5011 , which can prevent the pressing piece 7031 from falling off the first annular wall 501 , thereby ensuring that the first annular wall 501 can stably press the pressing piece 7031 .

[0088] A pressure equalizing plate 704 is provided between the spring plate 703 and the sealing lip 7021 .

[0089] An inner ring 7023 is provided on the sealing ring 702, and a plurality of second tightening parts 7024 are fixed on the surface of the inner ring 7023. The plurality of second tightening parts 7024 are concentrically arranged. A second annular wall 502 is provided on the wheel axle 5, and the plurality of second tightening parts 7024 press against the second annular wall 502 to form a secondary seal.

[0090] Since the wheel axle 5 is provided with a first annular wall 501 and a second annular wall 502, the wheel axle 5 is a variable diameter shaft. During installation, the sealing ring 702 is installed in the recessed groove 7011, the inner ring 7023 is fitted on the recessed groove 7011, and then the inner end cover 701 is sleeved on the wheel axle 5 and fixed to the wheel probe body 6, so that the top pressure piece 7031 is pressed against the first annular wall 501, the first tight part 7022 is fitted on the surface of the wheel axle 5, and the second tight part 7024 is pressed against the second annular wall 502. When the inner end cover 701 drives the sealing ring 702 to move axially along the wheel axle 5, the first annular wall 501 pushes the top pressure piece 7031, so that the equalizing plate 704 squeezes the sealing lip 7021, thereby enhancing the interference fit between the first pressing portion 7022 and the wheel axle 5. At the same time, when the inner end cover 701 drives the sealing ring 702 to move axially along the wheel axle 5, the second pressing portion 7024 can also be pressed against the second annular wall 502, thereby improving the sealing between the second pressing portion 7024 and the surface of the second annular wall 502.

[0091] The sealing ring 702 , the sealing lip 7021 , the first abutting portion 7022 , the inner ring 7023 and the second abutting portion 7024 are integrally formed.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A mechanism for improving the stability of ultrasonic probe wheel detection of pipes, characterized in that: include: substrate(1); A suspension plate (2), the suspension plate (2) being connected to the bottom of the base plate (1) in a floating manner via a suspension component (3); Two support arms (4), the two support arms (4) are symmetrically fixed on both sides of the suspension board (2); A wheel axle (5), the wheel axle (5) is arranged transversely below the suspension board (2), and both ends of the wheel axle (5) are respectively fixed to the support arms (4) on the same side; A probe wheel body (6), the probe wheel body (6) is rotatably sleeved on the wheel shaft (5), the interior of the probe wheel body (6) is filled with coupling agent, and sealing components (7) for preventing coupling agent leakage are provided at the connection points between the two ends of the probe wheel body (6) and the wheel shaft (5); Wherein, an ultrasonic probe (8) is provided in the detection wheel body (6), and the ultrasonic probe (8) is fixed to the middle of the wheel axle (5); The suspension assembly (3) comprises a plurality of guide rods (301), the upper ends of the plurality of guide rods (301) being fixedly connected to the base plate (1), and the lower ends of the plurality of guide rods (301) passing through the suspension plate (2) and being fixed with nuts (302); a spring (303) is sleeved on each guide rod (301), the upper end of the spring (303) abutting against the base plate (1), and the lower end of the spring (303) abutting against the upper surface of the suspension plate (2); Limiting rods (9) are fixed on both sides of the base plate (1), a sliding groove (401) is provided on the support arm (4), and the lower end of the limiting rod (9) is slidably connected to the inside of the sliding groove (401); The lower ends of the two support arms (4) are fixedly connected to a transverse support rod (10), a rolling element (11) is fixed on the transverse support rod (10), and the lower edge of the rolling element (11) is higher than the lower edge of the wheel probe body (6).

2. The mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 1 is characterized in that: The wheel probe body (6) is provided with a wheel skin (601) made of rubber material.

3. The mechanism for improving the stability of ultrasonic pipe detection according to claim 2, characterized in that: A front liquid pipe (12) is fixed to the front side of the suspension plate (2), and a rear liquid pipe (13) is fixed to the rear side of the suspension plate (2). Both the front liquid pipe (12) and the rear liquid pipe (13) are provided with flat nozzles, and the flat nozzles face the surface of the wheel skin (601).

4. The mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 1 is characterized in that: The sealing assembly (7) comprises: An inner end cover (701), the inner end cover (701) is fixed to the end of the probe wheel body (6) by means of bolts, and a sink groove (7011) is provided on a side wall of the inner end cover (701); A sealing ring (702), the sealing ring (702) being fixed inside the sink (7011), the sealing ring (702) being provided with a sealing lip (7021), and the sealing lip (7021) being provided with a first pressing portion (7022) pressing against the surface of the wheel shaft (5) to form a primary seal; A plurality of spring-pressing sheets (703) are circumferentially distributed between the sealing ring (702) and the sealing lip (7021) and are used to press the sealing lip (7021) toward the surface of the wheel axle (5).

5. The mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 4 is characterized in that: A pressing plate (7031) is fixed to one end of the elastic pressing plate (703) close to the wheel axle (5), and a flexible thin-walled portion (7032) is provided at one end of the elastic pressing plate (7031) close to the elastic pressing plate (703). The end of the pressing plate (7031) is bent to form a pressing portion, which is in close contact with the sealing lip (7021). Wherein, a first annular wall (501) is provided on the wheel axle (5), and the bent portion of the top pressure piece (7031) abuts against the first annular wall (501).

6. The mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 5, characterized in that: A pressure equalizing plate (704) is provided between the elastic pressure piece (703) and the sealing lip (7021).

7. A mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 5 or 6, characterized in that: An inner ring (7023) is provided on the sealing ring (702), and a plurality of second abutting portions (7024) are fixed on the surface of the inner ring (7023). A second annular wall (502) is provided on the wheel axle (5), and the plurality of second abutting portions (7024) abut against the second annular wall (502) to form a secondary seal.

8. The mechanism for improving the stability of ultrasonic probe wheel detection of pipes according to claim 1 is characterized in that: Both ends of the wheel probe body (6) are fixed with outer end covers (14), bearings (15) are fixed on the outer end covers (14), and the wheel shaft (5) is sleeved on the inner ring of the bearing (15).

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