Ultrasonic detection device for fillet weld of pipe joint and use method of ultrasonic detection device

Abstract

The invention relates to the technical field of ultrasonic detection of weld joints, aims to solve the problem that in the prior art, ultrasonic detection scanning and measurement of the inner wall of a pipe joint fillet weld with a small inner diameter are difficult or cannot be carried out, and provides an ultrasonic detection device for a pipe joint fillet weld and a use method thereof. A plurality of fixing and locking mechanisms are evenly installed on the outer wall of the circumferential sliding structure, a telescopic axial sliding structure is arranged on the inner wall of the circumferential sliding structure in the axial direction, and the axial sliding structure is in sliding fit with the inner wall of the circumferential sliding structure in the circumferential direction. And an ultrasonic detection probe fixing and pressing mechanism is mounted in the axial direction of the axial sliding structure. The ultrasonic detection device has the beneficial effects that the problem that ultrasonic detection cannot be carried out on the inner wall of the small-inner-diameter pipe joint due to space limitation can be solved, it is ensured that detection meets the standard requirement, the detection precision and applicability are improved, and potential safety hazards of equipment are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of weld ultrasonic testing, in particular to a device for ultrasonic testing of a pipe joint fillet weld and a method of using the same. BACKGROUND

[0002] In the field of industrial equipment manufacturing and operation, the pipe joint fillet weld at the connection between the pipe and the cylinder is a key link to ensure the overall sealing and structural strength of the equipment, and the welding quality directly relates to the safe and stable operation of the equipment. Therefore, accurate and effective ultrasonic testing of such fillet welds is an important means to ensure the safety of industrial production. According to the requirements of relevant detection standards on technical levels, combined with the thickness differences of the workpieces to be detected, the inner wall of the pipe joint needs to be selected or forcibly specified as the scanning surface for ultrasonic testing during the ultrasonic testing of the pipe joint fillet weld, depending on the specific circumstances. The purpose of this technical requirement is to more accurately capture defects that may exist in the key areas by scanning from the inner wall side, thereby improving the reliability and accuracy of the testing.

[0003] However, in actual testing work, due to significant differences in the size of the pipe joint, the inner diameter of some pipe joints is small (such as less than 90 mm, or even smaller), and the internal space is extremely narrow. This space limitation directly prevents the tester from holding a conventional ultrasonic testing probe to enter the inner side of the pipe joint, i.e., the base material area near the fillet weld of the pipe joint, thereby making it difficult to complete the ultrasonic testing scanning operation and related positioning measurement work from the inner wall side of the pipe joint.

[0004] More critically, when the inner wall is specified as the mandatory detection scanning surface in the technical requirements of the detection standard, the operational obstacles caused by the excessively small inner diameter of the pipe joint make it impossible to strictly follow the standard requirements to carry out comprehensive testing, ultimately resulting in detection results that cannot fully meet the technical specifications of the detection standard, leaving potential risks for the safety assessment of the equipment. SUMMARY

[0005] The present application aims to provide a device for ultrasonic testing of a pipe joint fillet weld and a method of using the same, to solve the problem of difficulty or impossibility of inner wall ultrasonic testing scanning and measurement for pipe joint fillet welds with small inner diameters in the prior art.

[0006] Embodiments of the present application are implemented as follows: The present application provides a device for ultrasonic testing of a pipe joint fillet weld, which comprises a circumferential sliding structure; The outer wall of the circumferential sliding structure is uniformly provided with a plurality of fixed locking mechanisms, and the inner wall of the circumferential sliding structure is provided with an axially extendable axial sliding structure, which is in circumferential sliding cooperation with the inner wall of the circumferential sliding structure; The inner wall of the circumferential sliding structure is circumferentially provided with a circumferential isosceles trapezoidal sliding groove, and the axial sliding structure has a circumferential sliding connecting body, which has a circumferential isosceles trapezoidal sliding block slidably connected in the circumferential isosceles trapezoidal sliding groove. The axial sliding structure has an axial sliding body slidably arranged in the axial direction, and the axial sliding body is provided with an ultrasonic detection probe fixing and pressing mechanism slidably mounted thereon.

[0007] The ultrasonic detection device for the pipe joint fillet weld disclosed in the embodiment can fix and press the ultrasonic detection probe in the predetermined scanning area on the inner wall of the pipe joint, ensure that the probe reaches the predetermined scanning area and detects the coupling effect, realize the axial forward and backward movement, circumferential left and right movement and accurate positioning and measurement of the probe position in the scanning area on the inner wall of the pipe joint, and thus solve the problem that the small inner diameter pipe joint cannot be ultrasonically detected from the inner wall due to space limitation, ensure that the detection meets the standard requirements, improve the detection accuracy and applicability, and reduce the safety hazards of the equipment.

[0008] Optionally, the fixing locking mechanisms include a first locking mechanism, a second locking mechanism and a third locking mechanism, and the first locking mechanism, the second locking mechanism and the third locking mechanism are uniformly installed along the outer wall of the circumferential sliding structure. The first locking mechanism, the second locking mechanism and the third locking mechanism each have a U-shaped connecting and fastening carrier, one wing of the U-shaped connecting and fastening carrier is provided with a first axial isosceles trapezoidal groove in the axial direction, and the outer wall of the circumferential sliding structure is provided with a first isosceles trapezoidal sliding body matched with the first axial isosceles trapezoidal groove, which is slidably embedded in the first axial isosceles trapezoidal groove. The slot end of the first axial isosceles trapezoidal groove is provided with a fixed plate, and the fixed plate is installed at the slot end of the first axial isosceles trapezoidal groove through a fixed screw.

[0009] In this way, the first axial isosceles trapezoidal groove and the first isosceles trapezoidal sliding body are connected to each other, so that the fixing locking mechanisms are connected to the circumferential sliding structure and are fastened by the fixed plate and the fixed screw, thereby preventing the first locking mechanism, the second locking mechanism and the third locking mechanism from falling off the circumferential sliding structure.

[0010] Optionally, the other wing of the U-shaped connecting and fastening carrier is transversely provided with a plurality of locking holes, the plurality of locking holes penetrate the other wing of the U-shaped connecting and fastening carrier, and the plurality of locking holes are each fitted with an adjusting and fastening bolt.

[0011] In this way, the first locking mechanism, the second locking mechanism and the third locking mechanism are inserted into the pipe joint end, the device is fastened at the pipe joint end by adjusting and tightening the adjusting fastening bolts, and the center of the circumferential sliding structure is substantially coincided with the center of the pipe joint, so that subsequent detection is facilitated.

[0012] Optionally, the circumferential sliding structure has a circumferential sliding left carrier and a circumferential sliding right carrier which are symmetrically distributed, and symmetric positioning holes are formed at end faces of the circumferential sliding left carrier and the circumferential sliding right carrier, and a positioning pin is connected between the positioning holes of the circumferential sliding left carrier and the circumferential sliding right carrier. A connecting locking plate is arranged on the top surface of the connection between the circumferential sliding left carrier and the circumferential sliding right carrier, and the connecting locking plate is fixedly installed on the top surface of the circumferential sliding left carrier and the circumferential sliding right carrier by first connecting screws and second connecting screws.

[0013] In this way, the circumferential sliding structure is arranged as the circumferential sliding left carrier and the circumferential sliding right carrier which are symmetrically distributed, so that the circumferential isosceles trapezoidal sliding groove can be easily machined on the circumferential sliding structure, the positioning holes and the positioning pin are adopted to achieve connection, which is conducive to accurate alignment of the circumferential sliding left carrier and the circumferential sliding right carrier, and the fixed plate effectively connects the circumferential sliding left carrier and the circumferential sliding right carrier into a whole.

[0014] Optionally, an annular scale is arranged on the top surface of the circumferential sliding left carrier, the circumferential sliding right carrier and the fixed plate. The circumferential sliding structure has a circumferential position pointer on the side close to the annular scale, and the circumferential position pointer is adapted to the annular scale.

[0015] In this way, when the axial sliding structure slides along the circumferential isosceles trapezoidal sliding groove, the staff can determine the circumferential moving position of the probe by indicating the scale value on the annular scale through the circumferential position pointer.

[0016] Optionally, the axial sliding structure further has an axial sliding groove carrier, and the bottom end of the axial sliding groove carrier is vertically connected to the top surface of the annular sliding connecting body by first fastening screws and second fastening screws. The axial sliding groove carrier has an isosceles trapezoidal groove on the side away from the circumferential sliding structure. The axial sliding body has an isosceles trapezoidal slide body on the side close to the axial sliding groove carrier. The isosceles trapezoidal slide body is slidably fitted into the isosceles trapezoidal groove. The axial sliding body is threaded with an axial positioning fastening screw in a direction perpendicular to the axial sliding groove carrier. The axial positioning fastening screw passes through the axial sliding body and abuts against the isosceles trapezoidal groove.

[0017] With this configuration, the isosceles trapezoidal groove and the isosceles trapezoidal slide body are slidably connected to each other, allowing the axial sliding body to slide along the axial direction of the axial sliding groove carrier. This enables the probe on the axial sliding body to move axially along the inner wall of the pipe joint for detection. At the same time, the axial positioning fastening screw allows the axial sliding body to be fixed at any position on the axial sliding groove carrier, which is beneficial for locking the axial position of the probe and facilitating detection.

[0018] Optionally: The top end of the axial sliding body is provided with an axial position measuring pointer, which is slidably attached to the side wall of the axial sliding groove carrier and installed on the top end of the axial sliding body by a third fastening bolt. The axial sliding groove carrier has an axial movement scale on the side away from the axial position measuring pointer, and the axial movement scale is adapted to the axial position measuring pointer.

[0019] With this configuration, the axial position measuring pointer moves along with the axial sliding body, allowing it to move on the axial movement scale, which facilitates the operator in determining the axial movement position of the probe.

[0020] Optionally: The ultrasonic testing probe fixing and clamping mechanism described above has a probe fixing carrier and a connecting fixing and clamping mechanism carrier, wherein the probe fixing carrier is adjustablely fastened to the connecting fixing and clamping mechanism carrier; The aforementioned connecting and fixing clamping mechanism carrier has an adjustable connecting and fixing body. The adjustable connecting and fixing body has a rectangular sliding groove that is adapted to the size of the lower section of the aforementioned axial sliding body. The adjustable connecting and fixing body has a plurality of axial position fastening and adjusting bolts on the side away from the aforementioned axial sliding body. The plurality of axial position fastening and adjusting bolts are threaded through the adjustable connecting and fixing body and abut against the aforementioned axial sliding body. The aforementioned adjusting connecting fixing body is elastically connected to one side of the aforementioned probe fixing carrier by a first telescopic body, a second telescopic body, a third telescopic body, and a fourth telescopic body. The aforementioned probe fixing carrier has a first rectangular slide groove, a second rectangular slide groove, a third rectangular slide groove, and a fourth rectangular slide groove. The aforementioned probe fixing carrier is slidably and securely fastened to the aforementioned first telescopic body, the aforementioned second telescopic body, the aforementioned third telescopic body, and the aforementioned fourth telescopic body through the aforementioned first rectangular slide groove, the aforementioned second rectangular slide groove, the aforementioned third rectangular slide groove, and the aforementioned fourth rectangular slide groove.

[0021] This configuration allows for easy control of the position of the ultrasonic probe fixing and clamping mechanism on the axial sliding body by adjusting the tightness of the axial position fastening bolts. This ensures that the ultrasonic probe fixing and clamping mechanism is locked on the axial sliding body, facilitating probe detection. Simultaneously, the cooperation between the first rectangular slide groove, the second rectangular slide groove, the third rectangular slide groove, and the fourth rectangular slide groove with the first telescopic body, the second telescopic body, the third telescopic body, and the fourth telescopic body facilitates the tight connection and relative position adjustment between the probe fixing carrier and the connecting and fixing clamping mechanism carrier.

[0022] Optionally: The aforementioned adjusting connecting fixing body has a first convex sliding groove, a second convex sliding groove, a third convex sliding groove, and a fourth convex sliding groove at the positions corresponding to the first telescopic body, the second telescopic body, the third telescopic body, and the fourth telescopic body. The bottom of each of the first convex sliding groove, the second convex sliding groove, the third convex sliding groove, and the fourth convex sliding groove is provided with a first spring. The first telescopic body, the second telescopic body, the third telescopic body, and the fourth telescopic body are placed into the first convex sliding groove, the second convex sliding groove, the third convex sliding groove, and the fourth convex sliding groove and abut against the first spring. The first convex sliding groove, the second convex sliding groove, the third convex sliding groove and the fourth convex sliding groove are equipped with telescopic body limiting rods near the groove openings. The outer side of the first telescopic body, the second telescopic body, the third telescopic body and the fourth telescopic body are all equipped with limiting blocks. The limiting blocks are limited between the telescopic body limiting rods and the first spring. The adjusting connecting fixing body at the tail end of the first convex sliding groove, the second convex sliding groove, the third convex sliding groove and the fourth convex sliding groove is threaded with a left connecting bolt, and the outer side of the limiting block is threaded with a right connecting bolt. A second spring is elastically connected between the left connecting bolt and the right connecting bolt.

[0023] With this configuration, the first spring provides a forward pushing force, allowing the first, second, third, and fourth telescopic bodies to extend forward. This enables them to elastically expand and contract within the first, second, third, and fourth convex sliding grooves, providing a thrust to the probe and ensuring it remains firmly against the inner wall of the pipe joint, thus ensuring the accuracy of weld inspection. The telescopic body limiting rod restricts the displacement distance of the limiting block, effectively preventing the first, second, third, and fourth telescopic bodies from moving out of the first, second, third, and fourth convex sliding grooves. The device slides out within the first, second, third, and fourth convex sliding grooves. The second spring between the left and right connecting bolts facilitates the retraction of the first, second, third, and fourth telescopic bodies. In conjunction with the first spring, these bodies can elastically expand and contract within the first, second, third, and fourth convex sliding grooves, ensuring the probe is elastically pressed against the inner wall of the pipe joint, thus facilitating ultrasonic scanning and positioning measurement of the weld seam on one side of the inner wall of the pipe joint.

[0024] Optionally: The probe fixing carrier has a left probe fixing body and a right probe fixing body, the probe housing is clamped between the left probe fixing body and the right probe fixing body and fixed to each other by fixing body fastening bolts, and the probe housing has a probe on the side away from the axial sliding body.

[0025] With this setup, the probe housing is clamped between the left and right probe fixing bodies, and the left and right probe fixing bodies are connected into a whole using the fixing body fastening bolts. This facilitates the installation and replacement of the probe, and allows for the replacement of different probes according to the testing situation.

[0026] Optionally: The left and right fixed bodies of the probe each have a fixing post on one side, and the probe housing has fixing holes on both sides corresponding to the fixing posts, with the fixing posts being inserted into the fixing holes.

[0027] With this configuration, the cooperation between the fixing post and the fixing hole makes the probe housing more securely clamped between the left and right fixing bodies of the probe, preventing displacement of the probe housing and thus preventing displacement of the probe.

[0028] Optionally, the outer sides of the left and right probe fixing bodies are provided with a first probe position fastening bolt, a second probe position fastening bolt, a third probe position fastening bolt, and a fourth probe position fastening bolt. The first, second, third, and fourth probe position fastening bolts respectively penetrate the left or right probe fixing body and abut against the first, second, third, or fourth telescopic body.

[0029] With this configuration, by controlling the tightness of the first probe position fastening bolt, the second probe position fastening bolt, the third probe position fastening bolt, and the fourth probe position fastening bolt, the position of the probe fixing carrier on the first telescopic body, the second telescopic body, the third telescopic body, and the fourth telescopic body can be controlled. This enables the probe fixing carrier and the connecting and fixing clamping mechanism carrier to be securely connected and their relative positions adjusted, facilitating the pressing of the probe against the weld inspection area on the inner wall of the pipe joint and making weld inspection convenient.

[0030] In one embodiment of this invention, a method for using an ultrasonic testing device for fillet welds of pipe joints is also provided. First, complete the fixing and adjustment preparation work of the device. The detection device is fixed and locked to the end of the pipe joint by several of the above-mentioned fixing and locking mechanisms. The gap distance between the inner wall of the pipe joint and the annular outer wall of the above-mentioned circumferential sliding structure is measured at multiple points in the circumferential direction. The above-mentioned adjusting and fastening bolts are used to adjust so that the above-mentioned circumferential sliding structure is basically concentric with the cross section of the pipe joint. Secondly, by adjusting the relative positions of the probe fixing carrier and the connecting fixing and clamping mechanism carrier, the clamping degree of the probe meets the coupling requirements of the detection. Next, loosen several of the aforementioned axial position fastening adjustment bolts to allow the ultrasonic probe fixing and clamping mechanism to slide freely in the lower section of the axial sliding body. Adjust the relative position so that when the axial sliding body is at the lowest position of the axial sliding groove carrier, the ultrasonic probe fixing and clamping mechanism is located at the starting position of the inner wall scanning area. Record the scale position on the axial movement scale indicated by the axial position measuring pointer at this time to facilitate the axial positioning of the ultrasonic probe fixing and clamping mechanism. Then tighten several of the aforementioned axial position fastening adjustment bolts to complete the locking of the ultrasonic probe fixing and clamping mechanism. Then, hold the hand-held protrusion on the axial sliding body and move it along the groove of the isosceles trapezoidal groove of the axial sliding groove carrier to move the probe back and forth in the root region of the inner wall of the pipe joint. The axial relative movement position of the probe is determined by the axial movement scale and the axial position measuring pointer. If necessary, the probe is temporarily tightened by the axial positioning fastening screw to prevent it from moving back and forth. Finally, by holding the hand-held protrusion on the axial sliding body, the entire axial sliding structure and the ultrasonic probe fixing and clamping mechanism are moved left and right along the circumferential isosceles trapezoidal sliding groove, so that the probe moves left and right in the circumferential direction in the root region of the inner wall of the pipe joint. The circumferential movement position of the probe is determined by the annular scale on the left circumferential sliding carrier, the right circumferential sliding carrier, and the fixing plate, as well as the circumferential position pointer on the back of the axial sliding structure.

[0031] In summary, the ultrasonic testing device and its method for pipe joint fillet welds disclosed in this invention can solve the problem that ultrasonic testing of small-diameter pipe joints cannot be performed from the inner wall due to space limitations, ensuring that the testing meets the standard requirements, improving the accuracy and applicability of the testing, and reducing equipment safety hazards. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a device for ultrasonic testing of fillet welds of pipe joints according to an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the fixing and locking mechanism in an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the circumferential sliding structure in an embodiment of the present invention; Figure 4 This is an exploded structural diagram of the axial sliding structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the axial sliding groove carrier in an embodiment of the present invention; Figure 6 This is an exploded structural diagram of the ultrasonic detection probe fixing and clamping mechanism in an embodiment of the present invention; Figure 7 This is a schematic diagram of the exploded structure of the probe fixing carrier in an embodiment of the present invention; Figure 8 This is an exploded structural diagram of the carrier connecting the fixed clamping mechanism in an embodiment of the present invention; Figure 9 This is a schematic diagram (partially cut open) from a first perspective of use for an ultrasonic testing device for fillet welds of pipe joints in an embodiment of the present invention. Figure 10 This is a schematic diagram from a second perspective of an ultrasonic testing device for fillet welds of pipe joints according to an embodiment of the present invention.

[0034] Icons: 1-Circumferential sliding structure, 2-Fixing and locking mechanism, 3-Axial sliding structure, 4-Circumferential isosceles trapezoidal sliding groove, 5-Circumferential sliding connector, 6-Circumferential isosceles trapezoidal sliding block, 7-Axial sliding body, 8-Ultrasonic testing probe fixing and clamping mechanism, 9-First locking mechanism, 10-Second locking mechanism, 11-Third locking mechanism, 12-U-shaped connecting fastening carrier, 13-First axial isosceles trapezoidal groove, 14-First isosceles trapezoidal sliding body, 15-Fixing plate, 16-Fixing screw, 17-Locking hole. 18-Adjusting fastening bolt, 19-Circumferential sliding left carrier, 20-Circumferential sliding right carrier, 21-Positioning pin, 22-Connecting locking plate, 23-First connecting screw, 24-Second connecting screw, 25-Annular scale, 26-Circumferential position pointer, 27-Axial sliding groove carrier, 28-First fastening bolt, 29-Second fastening bolt, 30-Isosceles trapezoidal groove, 31-Isosceles trapezoidal slide body, 32-Axial positioning fastening screw, 33-Axial position measuring pointer, 34-Third fastening bolt, 35-Shaft 36 - Moving scale; 37 - Probe fixing carrier; 38 - Connecting and fixing clamping mechanism carrier; 39 - Adjusting connecting fixing body; 40 - Rectangular sliding groove; 41 - Axial position fastening adjusting bolt; 42 - First telescopic body; 43 - Second telescopic body; 44 - Third telescopic body; 45 - Fourth telescopic body; 46 - First rectangular sliding groove; 47 - Third rectangular sliding groove; 48 - Fourth rectangular sliding groove; 49 - First convex sliding groove; 50 - Second convex sliding groove; 51 - Third convex sliding groove. 52-Fourth convex sliding groove, 53-First spring, 54-Telescopic body limiting rod, 55-Limiting block, 56-Left connecting bolt, 57-Right connecting bolt, 58-Second spring, 59-Left fixing body of probe, 60-Right fixing body of probe, 61-Probe housing, 62-Fixing body fastening bolt, 63-Probe, 64-Fixing post, 65-Fixing hole, 66-First probe position fastening bolt, 67-Second probe position fastening bolt, 68-Third probe position fastening bolt, 69-Fourth probe position fastening bolt. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] Example See Figures 1-10 This embodiment proposes an ultrasonic testing device for fillet welds of pipe joints, including a circumferential sliding structure 1; A number of fixing and locking mechanisms 2 are evenly installed on the outer wall of the circumferential sliding structure 1. An extendable axial sliding structure 3 is provided on the inner wall of the circumferential sliding structure 1. The axial sliding structure 3 slides circumferentially along the inner wall of the circumferential sliding structure 1. The inner wall of the circumferential sliding structure 1 is provided with a circumferential isosceles trapezoidal sliding groove 4, and the axial sliding structure 3 has a circumferential sliding connecting body 5, which has a circumferential isosceles trapezoidal sliding block 6 that is slidably connected in the circumferential isosceles trapezoidal sliding groove 4. The axial sliding structure 3 has a slidable axial sliding body 7 in the axial direction. The axial sliding body 7 is provided with an ultrasonic detection probe fixing and clamping mechanism 8, which is slidably fixedly installed on the axial sliding body 7.

[0038] The ultrasonic testing device for fillet welds of pipe joints disclosed in this embodiment achieves the fixation and clamping of the ultrasonic testing probe 63 within a predetermined scanning area on the inner wall of the pipe joint, ensuring that the probe 63 reaches the predetermined scanning area and the testing coupling effect is achieved. It realizes the axial forward and backward movement, circumferential left and right movement of the ultrasonic testing probe 63 within the scanning area on the inner wall of the pipe joint, and the accurate positioning and measurement of the probe 63 position. Thus, this ultrasonic testing device for fillet welds of pipe joints can solve the problem that ultrasonic testing of small inner diameter pipe joints cannot be performed from the inner wall due to space limitations, ensuring that the testing meets the standard requirements, improving the accuracy and applicability of the testing, and reducing the beneficial effects of equipment safety hazards.

[0039] See Figures 1-10 In this embodiment, the main function of several fixing and locking mechanisms 2 is to connect the circumferential sliding structure 1 and fix and lock the scanning device at the end of the pipe joint, providing the prerequisite for detection and positioning.

[0040] See Figures 1-10 In this embodiment, the circumferential sliding structure 1 mainly functions to support the axial sliding structure 3 through the circumferential isosceles trapezoidal sliding groove 4, thereby realizing the circumferential sliding of the ultrasonic testing probe 63 and the measurement of the circumferential position of the probe 63.

[0041] See Figures 1-10 In this embodiment, the main function of the axial sliding structure 3 is to realize the axial sliding of the ultrasonic testing probe 63 and the measurement of the axial position of the probe 63 through the isosceles trapezoidal groove 30 structure.

[0042] See Figures 1-10 In this embodiment, the main function of the ultrasonic detection probe fixing and clamping mechanism 8 is to fix the probe 63 and appropriately clamp the probe 63 through the telescopic mechanism to ensure the detection coupling effect. The relative position of the probe 63 and the axial sliding structure 3 is adjusted by several axial position fastening and adjusting bolts 40 to achieve the effect of moving the probe 63 in a predetermined area.

[0043] See Figures 1-10 The plurality of fixed locking mechanisms 2 have a first locking mechanism 9, a second locking mechanism 10 and a third locking mechanism 11, which are uniformly installed circumferentially along the outer wall of the circumferential sliding structure 1. The first locking mechanism 9, the second locking mechanism 10 and the third locking mechanism 11 all have a U-shaped connecting fastening carrier 12. One wing of the U-shaped connecting fastening carrier 12 is provided with a first axial isosceles trapezoidal groove 13. The outer wall of the circumferential sliding structure 1 has a first isosceles trapezoidal slide body 14 adapted to the first axial isosceles trapezoidal groove 13. The first isosceles trapezoidal slide body 14 can be slidably embedded into the first axial isosceles trapezoidal groove 13. A fixing plate 15 is provided at the groove end of the first axial isosceles trapezoidal groove 13. The fixing plate 15 is installed at the groove end of the first axial isosceles trapezoidal groove 13 by fixing screws 16. The first axial isosceles trapezoidal groove 13 is connected to the first isosceles trapezoidal slide body 14, so that a number of fixing locking mechanisms 2 are connected to the circumferential sliding structure 1 and are fastened by fixing plate 15 and fixing screws 16 to prevent the first locking mechanism 9, the second locking mechanism 10 and the third locking mechanism 11 from falling off the circumferential sliding structure 1.

[0044] Several locking holes 17 are provided on the other wing of the U-shaped fastening carrier 12. The locking holes 17 all penetrate the other wing of the U-shaped fastening carrier 12. Each locking hole 17 is fitted with an adjusting fastening bolt 18. The U-shaped fastening carrier 12 of the first locking mechanism 9, the second locking mechanism 10 and the third locking mechanism 11 is inserted into the end of the pipe joint. By adjusting and tightening the adjusting fastening bolts 18, the device is fastened to the end of the pipe joint, and the center of the circumferential sliding structure 1 is basically coincident with the center of the pipe joint, which facilitates subsequent testing.

[0045] In this embodiment, the fixing and locking mechanism 2 consists of a U-shaped connecting fastening carrier 12, adjusting fastening bolts 18, a fixing plate 15, and fixing screws 16, with a total of three sets. Each set is circumferentially spaced at an angle of 120°. The U-shaped connecting fastening carrier 12 is provided with a first axial isosceles trapezoidal groove 13. The fixing and locking mechanism 2 is connected to the circumferential sliding structure 1 by the corresponding first isosceles trapezoidal sliding bodies 14 on the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20, and is fastened by the fixing plate 15 and fixing screws 16. After the connection and fastening are completed, several fixing and locking mechanisms 2 are inserted into the end of the pipe joint. By adjusting and tightening each set of adjusting fastening bolts 18, the device is fastened to the end of the pipe joint, and the center of the circumferential sliding structure 1 is basically coincident with the center of the pipe joint.

[0046] See Figures 1-10 The circumferential sliding structure 1 has symmetrically distributed circumferential sliding left carrier 19 and circumferential sliding right carrier 20. Symmetrical positioning holes are provided on the end faces of both the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20. Positioning pins 21 connect the positioning holes of the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20. A connecting locking plate 22 is provided on the top surface of the connection between the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20. The connecting locking plate 22 is secured by a first connecting screw 23 and a second connecting screw 24. Fixedly installed on the top surfaces of the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20, the circumferential sliding structure 1 is set as a symmetrically distributed circumferential sliding left carrier 19 and circumferential sliding right carrier 20. This facilitates the machining of circumferential isosceles trapezoidal sliding grooves 4 on the circumferential sliding structure 1. The connection achieved by using positioning holes and positioning pins 21 is conducive to the accurate alignment of the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20. The fixing plate 15 effectively connects the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20 into a whole.

[0047] The top surfaces of the circumferential sliding left carrier 19, the circumferential sliding right carrier 20, and the fixed plate 15 are provided with an annular scale 25; the axial sliding structure 3 has a circumferential position pointer 26 on the side near the annular scale 25. The circumferential position pointer 26 is adapted to the annular scale 25. When the axial sliding structure 3 slides along the circumferential isosceles trapezoidal sliding groove 4, the operator can determine the circumferential movement position of the probe 63 by indicating the scale value on the annular scale 25 through the circumferential position pointer 26.

[0048] In this embodiment, the circumferential sliding structure 1 consists of a circumferential sliding left carrier 19, a circumferential sliding right carrier 20, a positioning pin 21, a connecting locking plate 22, a first connecting screw 23, and a second connecting screw 24. To facilitate the machining of the circumferential isosceles trapezoidal sliding groove 4 on the circumferential sliding structure 1, the circumferential sliding structure 1 is divided into a circumferential sliding left carrier 19 and a circumferential sliding right carrier 20 for separate machining. A ring-shaped scale 25 with circumferential intervals of 1 mm is machined on each of the two carriers. The surface is machined with positioning holes, and the positioning pins 21 ensure that the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20 are accurately aligned. They are then fastened and fixed with the connecting locking plate 22, the first connecting screw 23 and the second connecting screw 24. Before the circumferential sliding left carrier 19 and the circumferential sliding right carrier 20 are aligned and assembled, the circumferential isosceles trapezoidal sliding block 6 machined on the circumferential sliding connector 5 in the axial sliding structure 3 should first be installed into the circumferential isosceles trapezoidal sliding groove 4 of the circumferential sliding left carrier 19 or the circumferential sliding right carrier 20.

[0049] See Figures 1-10 The axial sliding structure 3 also has an axial sliding groove carrier 27. The bottom end of the axial sliding groove carrier 27 is vertically connected to the top surface of the circumferential sliding connection body 5 by a first fastening bolt 28 and a second fastening bolt 29. An isosceles trapezoidal groove 30 is axially formed on the side of the axial sliding groove carrier 27 away from the circumferential sliding structure 1. An isosceles trapezoidal slide body 31 is formed on the side of the axial sliding body 7 close to the axial sliding groove carrier 27. The isosceles trapezoidal slide body 31 is slidably fitted into the isosceles trapezoidal groove 30. The axial sliding body 7 is threadedly connected to an axial sliding groove carrier 27 in a direction perpendicular to the axial sliding groove carrier 27. The positioning and fastening screw 32 passes through the axial sliding body 7 and abuts against the isosceles trapezoidal slide groove 30. The isosceles trapezoidal slide groove 30 and the isosceles trapezoidal slide body 31 are slidably connected to each other, so that the axial sliding body 7 can slide along the axial sliding groove carrier 27, thereby enabling the probe 63 on the axial sliding body 7 to move axially along the inner wall of the pipe joint for detection. At the same time, the axial positioning and fastening screw 32 allows the axial sliding body 7 to be fixed at any position on the axial sliding groove carrier 27, which is beneficial for locking the axial position of the probe 63 and facilitating detection.

[0050] An axial position measuring pointer 33 is provided at the top of the axial sliding body 7. The axial position measuring pointer 33 is slidably attached to the side wall of the axial sliding groove carrier 27 and is installed on the top of the axial sliding body 7 by the third fastening bolt 34. An axial movement scale 35 is provided on the side of the axial sliding groove carrier 27 away from the axial position measuring pointer 33. The axial movement scale 35 is adapted to the axial position measuring pointer 33. The axial position measuring pointer 33 moves with the axial sliding body 7, so that the axial position measuring pointer 33 can move on the axial movement scale 35, which makes it convenient for the staff to determine the axial movement position of the probe 63.

[0051] In this embodiment, the axial sliding structure 3 consists of an axial sliding groove carrier 27, a circumferential sliding connector 5, a first fastening bolt 28, a second fastening bolt 29, an axial sliding body 7, an axial positioning fastening screw 32, an axial position measuring pointer 33, and a third fastening bolt 34.

[0052] The axial sliding groove carrier 27 and the circumferential sliding connector 5 are fastened together by the first fastening bolt 28 and the second fastening bolt 29, respectively providing axial sliding and limiting functions. At the same time, the circumferential sliding function is realized by the circumferential isosceles trapezoidal sliding block 6 machined on the circumferential sliding connector 5. The axial sliding groove carrier 27 has an axial movement scale 35 with an axial interval of 1mm and a circumferential position pointer 26 machined on the back side. After the axial sliding body 7, the axial positioning fastening screw 32, the axial position measuring pointer 33 and the third fastening bolt 34 are connected, the isosceles trapezoidal sliding body 31 machined on the axial sliding body 7 is inserted into the isosceles trapezoidal sliding groove 30 on the axial sliding groove carrier 27 to realize the axial sliding function of the axial sliding structure 3, and the axial positioning fastening screw 32 is used to temporarily fasten and fix the required position.

[0053] See Figures 1-10The ultrasonic probe fixing and clamping mechanism 8 has a probe fixing carrier 36 and a connecting fixing and clamping mechanism carrier 37. The probe fixing carrier 36 is adjustablely fastened to the connecting fixing and clamping mechanism carrier 37. The connecting fixing and clamping mechanism carrier 37 has an adjusting connecting fixing body 38. The adjusting connecting fixing body 38 has a rectangular sliding groove 39 on its axial direction that is adapted to the lower section size of the axial sliding body 7. The adjusting connecting fixing body 38 has several axial position fastening adjusting bolts 40 on the side away from the axial sliding body 7. The several axial position fastening adjusting bolts 40 are threaded through the adjusting connecting fixing body 38 and abut against the axial sliding body 7. The adjusting connecting fixing body 38 is elastically connected to a first telescopic body 41, a second telescopic body 42, a third telescopic body 43, and a fourth telescopic body 44 on the side corresponding to the probe fixing carrier 36. The probe fixing carrier 36 has a first rectangular sliding groove 45, a second rectangular sliding groove 46, a third rectangular sliding groove 47, and a fourth rectangular sliding groove 48. The probe fixing carrier 36 is slidably fastened to the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 via the first rectangular slide groove 45, the second rectangular slide groove 46, the third rectangular slide groove 47, and the fourth rectangular slide groove 48. By adjusting the tightness of the axial position fastening adjusting bolt 40, it is easy to control the position of the ultrasonic detection probe fixing clamping mechanism 8 on the axial sliding body 7, ensuring that the ultrasonic detection probe fixing clamping mechanism 8 is locked on the axial sliding body 7, which is convenient for probe 63 detection. At the same time, the cooperation between the first rectangular slide groove 45, the second rectangular slide groove 46, the third rectangular slide groove 47, and the fourth rectangular slide groove 48 and the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 facilitates the fastening connection and relative position adjustment between the probe fixing carrier 36 and the connecting fixing clamping mechanism carrier 37.

[0054] See Figures 1-10 The adjusting connecting fixing body 38 has a first convex sliding groove 49, a second convex sliding groove 50, a third convex sliding groove 51, and a fourth convex sliding groove 52 corresponding to the positions of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44. The bottom of the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52 is provided with a first spring 53. The first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 are placed into the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52 and abut against the first spring 53. The first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51 and the fourth convex sliding groove 52 are equipped with telescopic body limiting rods 54 near the groove openings. The outer sides of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43 and the fourth telescopic body 44 are all equipped with limiting blocks 55, which are limited between the telescopic body limiting rods 54 and the first spring 53. The adjusting connecting fixing body 38 at the tail end of the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52 are all threaded with a left connecting bolt 56. A right connecting bolt 57 is threaded to the outer side of the limiting block 55. A second spring 58 is elastically connected between the left connecting bolt 56 and the right connecting bolt 57. The first spring 53 provides a forward pushing force, allowing the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 to extend forward. This allows the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 to elastically expand and contract within the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52. This provides a thrust to the probe 63, ensuring that the probe 63 is tightly attached to the inner wall of the pipe joint, ensuring the accuracy of weld inspection. The telescopic body limiting rod 54 can... The limiting block 55 effectively restricts the displacement distance of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44, preventing them from slipping out of the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52. The second spring 58 between the left connecting bolt 56 and the right connecting bolt 57 facilitates the retraction of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44. In conjunction with the first spring 53, the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 can elastically extend and retract within the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52. This ensures that the probe 63 elastically presses against the inner wall of the pipe joint, facilitating the ultrasonic inspection and positioning measurement of the weld seam on one side of the inner wall of the pipe joint.

[0055] See Figures 1-10In this embodiment, the ultrasonic probe fixing and clamping mechanism 8 consists of a probe fixing carrier 36 and a connecting fixing and clamping mechanism carrier 37. The probe fixing carrier 36 is machined with a first rectangular slide groove 45, a second rectangular slide groove 46, a third rectangular slide groove 47, and a fourth rectangular slide groove 48 that match the dimensions of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44. The probe fixing carrier 36 and the connecting fixing and clamping mechanism carrier 37 are fastened together and their relative positions are adjusted by the first probe position fastening bolt, the second probe position fastening bolt, the third probe position fastening bolt, and the fourth probe position fastening bolt.

[0056] See Figures 1-10 In this embodiment, the connecting and fixing clamping mechanism carrier 37 consists of an adjusting connecting fixing body 38, an axial position fastening adjusting bolt 40, a second spring 58, a left connecting bolt 56, a telescopic body limiting rod 54, a first spring 53, a first telescopic body 41, a second telescopic body 42, a third telescopic body 43, a fourth telescopic body 44, and a right connecting bolt 57. The adjusting connecting fixing body 38 has rectangular sliding grooves 39 on its upper and lower sides that are the same size as the lower side of the axial sliding body 7, which can realize the adjustment of the axial relative position of the ultrasonic detection probe fixing clamping mechanism 8. It is tightened and fixed by several axial position fastening adjusting bolts 40. The adjusting connecting fixing body 38 is processed with the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44. During assembly, the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52 are matched. First, the first spring 53 is installed in the first convex sliding groove 49, the second convex sliding groove 50, the third convex sliding groove 51, and the fourth convex sliding groove 52, respectively. Then, the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 are installed respectively. After that, the telescopic body limiting rod 54 is inserted to prevent the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 from falling out due to the tension of the first spring 53. The second spring 58 is installed between the adjusting connecting fixing body 38 and the limiting block 55 to cooperate with the first spring 53 to adjust the telescopic or pressing capacity of the mechanism.

[0057] See Figures 1-10 The probe fixing carrier 36 has a left probe fixing body 59 and a right probe fixing body 60. The probe housing 61 is clamped between the left probe fixing body 59 and the right probe fixing body 60 and fixed to each other by fixing body fastening bolts 62. The probe housing 61 has a probe 63 on the side away from the axial sliding body 7. The probe housing 61 is clamped by the left probe fixing body 59 and the right probe fixing body 60, and the left probe fixing body 59 and the right probe fixing body 60 are connected into a whole by fixing body fastening bolts 62. This facilitates the installation and replacement of the probe 63 and makes it convenient to replace different probes 63 according to the detection situation.

[0058] The left fixing body 59 and the right fixing body 60 of the probe each have a fixing post 64 on one side corresponding to each other. The probe housing 61 has fixing holes 65 on both sides corresponding to the fixing posts 64. The fixing posts are embedded in the fixing holes 65. The cooperation between the fixing posts 64 and the fixing holes 65 makes the probe housing 61 more securely clamped between the left fixing body 59 and the right fixing body 60 of the probe, avoiding displacement of the probe housing 61, and thus preventing displacement of the probe.

[0059] See Figures 1-10 The outer sides of the left probe fixing body 59 and the right probe fixing body 60 are provided with a first probe position fastening bolt, a second probe position fastening bolt, a third probe position fastening bolt, and a fourth probe position fastening bolt. The first probe position fastening bolt, the second probe position fastening bolt, the third probe position fastening bolt, and the fourth probe position fastening bolt pass through the left probe fixing body 59 or the right probe fixing body 60 and abut against the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, or the fourth telescopic body 44. By controlling the tightness of the first probe position fastening bolt, the second probe position fastening bolt, the third probe position fastening bolt, and the fourth probe position fastening bolt, the position of the probe fixing carrier 36 on the first telescopic body 41, the second telescopic body 42, the third telescopic body 43, and the fourth telescopic body 44 can be controlled, thereby realizing the tight connection and relative position adjustment of the probe fixing carrier 36 and the connecting and fixing clamping mechanism carrier 37, which facilitates the probe 63 to press against the weld scanning area on the inner wall of the pipe joint, and facilitates the inspection of the weld.

[0060] See Figures 1-10 In this embodiment, the probe fixing carrier 36 is composed of a left probe fixing body 59, a right probe fixing body 60, a fixing body fastening bolt 62, a first probe position fastening bolt, a second probe position fastening bolt, a third probe position fastening bolt, and a fourth probe position fastening bolt.

[0061] The fixing posts 64 machined on the left fixing body 59 and the right fixing body 60 of the probe match the fixing holes 65 machined on the probe housing 61. After assembly, they are fastened by the fixing body fastening bolts 62. The left fixing body 59 and the right fixing body 60 of the probe are machined with a first rectangular slide groove 45, a second rectangular slide groove 46, a third rectangular slide groove 47 and a fourth rectangular slide groove 48 that match the dimensions of the first telescopic body 41, the second telescopic body 42, the third telescopic body 43 and the fourth telescopic body 44. The probe fixing carrier 36 and the connecting and fixing clamping machine are fastened and their relative positions are adjusted by the first probe position fastening bolt, the second probe position fastening bolt, the third probe position fastening bolt and the fourth probe position fastening bolt.

[0062] See ​In one embodiment of this invention, a method for using an ultrasonic testing device for fillet welds of pipe joints is also provided. First, complete the fixing and adjustment preparation work of the device. The testing device is fixed and locked to the end of the pipe joint by several fixing and locking mechanisms 2. The gap distance between the inner wall of the pipe joint and the annular outer wall of the circumferential sliding structure 1 is measured at multiple points in the circumferential direction. Adjustment is made using adjusting fastening bolts 18 so that the circumferential sliding structure 1 is basically concentric with the cross section of the pipe joint. Secondly, by adjusting the relative position of the probe fixing carrier 36 and the connecting fixing and clamping mechanism carrier 37, the clamping degree of the probe 63 is made to meet the coupling requirements of the detection. Next, loosen several axial position fastening adjustment bolts 40 to allow the ultrasonic probe fixing and clamping mechanism 8 to slide freely in the lower section of the axial sliding body 7. Adjust the relative position so that when the axial sliding body 7 is at the lowest position of the axial sliding groove carrier 27, the ultrasonic probe fixing and clamping mechanism 8 is located at the starting position of the inner wall scanning area. Record the scale position on the axial movement scale 35 pointed to by the axial position measuring pointer 33 at this time to facilitate the axial positioning of the ultrasonic probe fixing and clamping mechanism 8. Then tighten several axial position fastening adjustment bolts 40 to complete the locking of the ultrasonic probe fixing and clamping mechanism 8. Then, hold the hand-held protrusion on the axial sliding body 7 and move it along the groove direction of the isosceles trapezoidal groove 30 of the axial sliding groove carrier 27, so that the probe 63 moves back and forth in the root area of ​​the inner wall of the pipe joint. The axial relative movement position of the probe 63 is determined by the axial movement scale 35 and the axial position measuring pointer 33. If necessary, the probe 63 is temporarily tightened by the axial positioning fastening screw 32 to prevent it from moving back and forth. Finally, by holding the hand-held protrusion on the axial sliding body 7, the entire axial sliding structure 3 and the ultrasonic testing probe fixing and clamping mechanism 8 are moved left and right along the circumferential isosceles trapezoidal sliding groove 4, causing the probe 63 to move left and right circumferentially in the root region of the inner wall of the pipe joint. The circumferential movement position of the probe 63 is determined by the annular scale 25 on the circumferential sliding left carrier 19, the circumferential sliding right carrier 20 and the fixing plate 15, and the circumferential position pointer 26 on the back of the axial sliding structure 3. Through the above operation, the probe 63 is moved back and forth and left and right in the root region of the inner wall of the fillet weld of the pipe joint, and the position of the probe 63 is measured and recorded outside the pipe joint. Defect location is then performed by combining the parameters of the probe 63.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ultrasonic testing device for fillet welds of pipe joints, characterized in that: Including a circumferential sliding structure (1); A plurality of fixing and locking mechanisms (2) are evenly installed on the outer wall of the circumferential sliding structure (1), and an extendable axial sliding structure (3) is provided on the inner wall of the circumferential sliding structure (1). The axial sliding structure (3) slides circumferentially along the inner wall of the circumferential sliding structure (1). The inner wall of the circumferential sliding structure (1) is provided with a circumferential isosceles trapezoidal sliding groove (4), and the axial sliding structure (3) has a circumferential sliding connector (5), which has a circumferential isosceles trapezoidal sliding block (6) that is slidably connected in the circumferential isosceles trapezoidal sliding groove (4). The axial sliding structure (3) has a slidable axial sliding body (7) in the axial direction. The axial sliding body (7) is provided with an ultrasonic detection probe fixing and clamping mechanism (8). The ultrasonic detection probe fixing and clamping mechanism (8) is slidably fixed on the axial sliding body (7).

2. The ultrasonic testing device for fillet welds of pipe joints according to claim 1, characterized in that: The fixing and locking mechanisms (2) include a first locking mechanism (9), a second locking mechanism (10) and a third locking mechanism (11), wherein the first locking mechanism (9), the second locking mechanism (10) and the third locking mechanism (11) are uniformly installed circumferentially along the outer wall of the circumferential sliding structure (1); The first locking mechanism (9), the second locking mechanism (10) and the third locking mechanism (11) all have a U-shaped connecting fastening carrier (12). A first axial isosceles trapezoidal groove (13) is provided on one wing of the U-shaped connecting fastening carrier (12). The outer wall of the circumferential sliding structure (1) has a first isosceles trapezoidal slide body (14) adapted to the first axial isosceles trapezoidal groove (13). The first isosceles trapezoidal slide body (14) is slidably embedded in the first axial isosceles trapezoidal groove (13). The first axial isosceles trapezoidal groove (13) has a fixing plate (15) at the groove end, and the fixing plate (15) is installed at the groove end of the first axial isosceles trapezoidal groove (13) by fixing screws (16).

3. The ultrasonic testing device for fillet welds of pipe joints according to claim 2, characterized in that: The other wing of the U-shaped fastening carrier (12) has several locking holes (17) on its lateral side. The locking holes (17) all penetrate the other wing of the U-shaped fastening carrier (12), and each locking hole (17) is fitted with an adjusting fastening bolt (18).

4. The ultrasonic testing device for fillet welds of pipe joints according to claim 2, characterized in that: The circumferential sliding structure (1) has symmetrically distributed circumferential sliding left carrier (19) and circumferential sliding right carrier (20). Symmetrical positioning holes are provided at the end faces of the circumferential sliding left carrier (19) and the circumferential sliding right carrier (20). A positioning pin (21) is connected between the positioning hole of the circumferential sliding left carrier (19) and the positioning hole of the circumferential sliding right carrier (20). A connecting locking plate (22) is provided on the top surface of the connection between the circumferential sliding left carrier (19) and the circumferential sliding right carrier (20). The connecting locking plate (22) is fixedly installed on the top surface of the circumferential sliding left carrier (19) and the circumferential sliding right carrier (20) by a first connecting screw (23) and a second connecting screw (24).

5. The ultrasonic testing device for fillet welds of pipe joints according to claim 4, characterized in that: The top surfaces of the circumferential sliding left carrier (19), the circumferential sliding right carrier (20), and the fixed plate (15) are provided with an annular scale (25); The axial sliding structure (3) has a circumferential position pointer (26) on the side near the annular scale (25), and the circumferential position pointer (26) is adapted to the annular scale (25).

6. The ultrasonic testing device for fillet welds of pipe joints according to claim 1, characterized in that: The axial sliding structure (3) also has an axial sliding groove carrier (27), the bottom end of which is vertically connected to the top surface of the circumferential sliding connector (5) by a first fastening bolt (28) and a second fastening bolt (29). The axial sliding groove carrier (27) has an isosceles trapezoidal groove (30) on the side away from the circumferential sliding structure (1) in the axial direction. The axial sliding body (7) has an isosceles trapezoidal slide body (31) on the side close to the axial sliding groove carrier (27). The isosceles trapezoidal slide body (31) is slidably adapted to the isosceles trapezoidal groove (30). The axial sliding body (7) is threaded with an axial positioning fastening screw (32) in a direction perpendicular to the axial sliding groove carrier (27). The axial positioning fastening screw (32) passes through the axial sliding body (7) and abuts against the isosceles trapezoidal groove (30).

7. The ultrasonic testing device for fillet welds of pipe joints according to claim 6, characterized in that: The top end of the axial sliding body (7) is provided with an axial position measuring pointer (33), which is slidably attached to the side wall of the axial sliding groove carrier (27) and installed on the top end of the axial sliding body (7) by a third fastening bolt (34). The axial sliding groove carrier (27) has an axial movement scale (35) on the side away from the axial position measuring pointer (33), and the axial movement scale (35) is adapted to the axial position measuring pointer (33).

8. The ultrasonic testing device for fillet welds of pipe joints according to claim 1, characterized in that: The ultrasonic testing probe fixing and clamping mechanism (8) has a probe fixing carrier (36) and a connecting fixing and clamping mechanism carrier (37), wherein the probe fixing carrier (36) is adjustablely fastened to the connecting fixing and clamping mechanism carrier (37); The connecting and fixing clamping mechanism carrier (37) has an adjusting connecting and fixing body (38). The adjusting connecting and fixing body (38) has a rectangular sliding groove (39) on its axial direction that is adapted to the size of the lower section of the axial sliding body (7). The adjusting connecting and fixing body (38) has a plurality of axial position fastening adjusting bolts (40) on the side away from the axial sliding body (7). The plurality of axial position fastening adjusting bolts (40) are threaded through the adjusting connecting and fixing body (38) and abut against the axial sliding body (7). The adjusting connecting fixing body (38) is elastically connected to one side of the probe fixing carrier (36) by a first telescopic body (41), a second telescopic body (42), a third telescopic body (43), and a fourth telescopic body (44). The probe fixing carrier (36) has a first rectangular slide groove (45), a second rectangular slide groove (46), a third rectangular slide groove (47), and a fourth rectangular slide groove (48). The probe fixing carrier (36) is slidably and securely fastened to the first telescopic body (41), the second telescopic body (42), the third telescopic body (43), and the fourth telescopic body (44) through the first rectangular slide groove (45), the second rectangular slide groove (46), the third rectangular slide groove (47), and the fourth rectangular slide groove (48).

9. The ultrasonic testing device for fillet welds of pipe joints according to claim 8, characterized in that: The adjusting connecting fixing body (38) has a first convex sliding groove (49), a second convex sliding groove (50), a third convex sliding groove (51), and a fourth convex sliding groove (52) at the positions corresponding to the first telescopic body (41), the second telescopic body (42), the third telescopic body (43), and the fourth telescopic body (44). The bottom of the first convex sliding groove (49), the second convex sliding groove (50), the third convex sliding groove (51), and the fourth convex sliding groove (52) are all provided with a first spring (53). The first telescopic body (41), the second telescopic body (42), the third telescopic body (43), and the fourth telescopic body (44) are placed into the first convex sliding groove (49), the second convex sliding groove (50), the third convex sliding groove (51), and the fourth convex sliding groove (52) and abut against the first spring (53). The first convex sliding groove (49), the second convex sliding groove (50), the third convex sliding groove (51) and the fourth convex sliding groove (52) are equipped with telescopic body limiting rods (54) near the groove openings. The first telescopic body (41), the second telescopic body (42), the third telescopic body (43) and the fourth telescopic body (44) are all equipped with limiting blocks (55) on their outer sides. The limiting blocks (55) are limited between the telescopic body limiting rods (54) and the first spring (53). The adjusting connecting fixing body (38) at the tail end of the first convex sliding groove (49), the second convex sliding groove (50), the third convex sliding groove (51) and the fourth convex sliding groove (52) are all threaded with a left connecting bolt (56), and the outer side of the limiting block (55) is threaded with a right connecting bolt (57). A second spring (58) is elastically connected between the left connecting bolt (56) and the right connecting bolt (57).

10. A method of using the ultrasonic testing device for fillet welds of pipe joints according to any one of claims 1 to 9, characterized in that: First, complete the fixing and adjustment preparation work of the device. The detection device is fixed and locked to the end of the pipe joint by several fixing and locking mechanisms (2). The gap distance between the inner wall of the pipe joint and the annular outer wall of the circumferential sliding structure (1) is measured at multiple points in the circumferential direction. The adjustment and fastening bolts (18) are used to adjust the circumferential sliding structure (1) so that it is basically concentric with the cross section of the pipe joint. Secondly, by adjusting the relative position of the probe fixing carrier (36) and the connecting fixing and pressing mechanism carrier (37), the pressing degree of the probe meets the coupling requirements of the detection. Next, loosen several of the axial position fastening adjustment bolts (40) to allow the ultrasonic probe fixing clamping mechanism (8) to slide freely in the lower section of the axial sliding body (7). Adjust the relative position so that when the axial sliding body (7) is at the lowest position of the axial sliding groove carrier (27), the ultrasonic probe fixing clamping mechanism (8) is located at the starting position of the inner wall scanning area. Record the scale position on the axial movement scale (35) pointed to by the axial position measuring pointer (33) at this time to facilitate the axial positioning of the ultrasonic probe fixing clamping mechanism (8). Then tighten several of the axial position fastening adjustment bolts (40) to complete the locking of the ultrasonic probe fixing clamping mechanism (8). Then, hold the hand-held protrusion on the axial sliding body (7) and move it along the groove direction of the isosceles trapezoidal groove (30) of the axial sliding groove carrier (27) to make the probe move back and forth in the root area of ​​the inner wall of the pipe joint. The axial relative movement position of the probe is determined by the axial movement scale (35) and the axial position measuring pointer (33). If necessary, the probe is temporarily tightened by the axial positioning fastening screw (32) to prevent it from moving back and forth. Finally, by holding the hand-held protrusion on the axial sliding body (7), the entire axial sliding structure (3) and the ultrasonic probe fixing and clamping mechanism (8) are pulled to move along the circumferential direction of the circumferential isosceles trapezoidal sliding groove (4), so that the probe moves circumferentially in the root region of the inner wall of the pipe joint. The circumferential movement position of the probe is determined by the annular scale (25) on the circumferential sliding left carrier (19), the circumferential sliding right carrier (20) and the fixed plate (15) and the circumferential position pointer (26) on the back of the axial sliding structure (3).

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