An easy-to-insert fillet weld TOFD detection device and its use method

Abstract

The invention discloses a device for TOFD detection of fillet welds that is easy to insert and a method for using the device. The device comprises a connecting pipe and a cylinder body, wherein the connecting pipe and the cylinder body are arranged side by side and fixed by welding, a pipe seat is arranged on the inner side of the connecting pipe, a guide rail is fixed on one side surface of the pipe seat, and an encoder, a first probe and a second probe are included on the lower surface of the guide rail, the first probe and the second probe are arranged side by side, an encoder is arranged on one side of the first probe, and an adjusting threaded rod is rotatably arranged on the inner side of the pipe seat; by arranging the pipe seat, the adjusting threaded rod, the spiral ring cylinder, the connecting plate and the supporting rod, it is convenient to avoid that only linear motion can be performed during detection, and circumferential motion cannot be performed well along the weld, so that the probe and the weld are detected vertically; by arranging the ball, the limit baffle and the connecting screw, it is convenient to avoid that the lower surface of the pipe seat and the outer object have a large contact and sliding friction during the rotation of the pipe seat itself.

Description

Technical Field

[0001] The invention belongs to the technical field of weld detection, and in particular relates to an easy-to-insert fillet weld TOFD detection device and a use method thereof. Background Art

[0002] TOFD (Time of Flight Diffraction) detection technology is one of the latest ultrasonic detection technologies. Its main feature is to use ultrasonic diffraction, reflection and other signals to achieve the purpose of detection. The quantification of defects not only depends on the amplitude of the signal, but also has a relatively high detection sensitivity. At the same time, this technology combines advanced data processing and image processing technology, can be real-time imaging, defect analysis is clear and intuitive, detection data is accurate, reliable and recordable, and has some advantages of radiographic flaw detection. At present, many domestic projects, such as West-East Gas Transmission, offshore pipe laying, hydropower station construction, heavy containers, and nuclear power in-service inspections have successfully used TOFD detection.

[0003] The existing TOFD inspection of butt welds of container cylinders is mainly based on non-parallel scanning along the direction of the weld. This method uses a scanner (which can only move in a straight line) to record the position of defects in the longitudinal direction of the weld and realize weld inspection. In container manufacturing, there is also a weld structure called an inserted fillet weld. This type of weld is circumferential. If this type of weld is to be inspected by TOFD, it cannot be realized with the existing scanner. The existing scanner can only move in a straight line. There is an urgent need for a scanner that can move circumferentially along the weld and ensure that each set of probes is perpendicular to the weld. For this reason, we propose an easy-to-insert fillet weld TOFD inspection device and its use method. Summary of the invention

[0004] The purpose of the present invention is to provide an easy-to-insert fillet weld TOFD detection device and a method of using the same, in order to solve the problem that the existing container barrel butt weld TOFD detection mentioned in the above background technology is mainly based on non-parallel scanning along the weld direction. This method uses a scanner (which can only make linear motion) to record the position of defects in the longitudinal direction of the weld and realize weld detection. In container manufacturing, there is also a weld structure of an inserted fillet weld. This type of weld is circumferential. If this type of weld is to be TOFD detected, it cannot be achieved with the existing scanner. The existing scanner can only make linear motion, and there is an urgent need for a scanner that can make circumferential motion along the weld and ensure that each set of probes is perpendicular to the weld.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A device for TOFD detection of easily inserted fillet welds, comprising a connecting pipe and a cylinder, the connecting pipe and the cylinder are arranged side by side, the connecting pipe and the cylinder are fixed by welding, a pipe seat is arranged on the inner side of the connecting pipe, a guide rail is fixed on one side surface of the pipe seat, the lower surface of the guide rail comprises an encoder, a first probe and a second probe, the first probe and the second probe are arranged side by side, an encoder is arranged on one side of the first probe, an adjusting threaded rod is rotatably arranged on the inner side of the pipe seat, a spiral ring cylinder is connected to the outer surface of the adjusting threaded rod through a threaded portion, a guide groove is opened on one side wall of the pipe seat, a connecting plate is arranged on the inner side of the guide groove, one end of the connecting plate is matched with the spiral ring cylinder through a first rotating rod, one end of the connecting plate is rotatably arranged with a support rod, a connecting ring is fixed on one side wall of the pipe seat, the support rod and the connecting ring are matched with each other through a second rotating rod, and a ball mechanism is arranged on the lower surface of the pipe seat.

[0006] Preferably, the ball mechanism includes a ball, a limit baffle and a connecting screw. A limit baffle is provided on the lower surface of the tube seat, a connecting screw is provided on the inner edge of the limit baffle, the limit baffle and the tube seat are matched and connected through the connecting screw, a rotation groove is opened on the inner side of the limit baffle, and a ball is provided on the inner side of the rotation groove.

[0007] Preferably, the outer surface of the limit baffle is flush with the outer surface of the tube seat, and a plurality of the balls are evenly distributed along the circumference of the limit baffle.

[0008] Preferably, the support rod is a hollow structure, and a wear-resistant steel block is fixed to one end of the support rod.

[0009] Preferably, the wear-resistant steel block is a spherical structure, and the outer diameter of the wear-resistant steel block is one centimeter to five centimeters larger than the outer diameter of the support rod.

[0010] Preferably, a rotating disk is fixed to the top end of the adjusting threaded rod, and the rotating disk is circular.

[0011] Preferably, one end of the guide rail is connected to a roller via a bracket, and the roller is in contact with the cylinder.

[0012] Preferably, the tube seat is rectangular, and a plurality of the first probes and the second probes are arranged along the long sides of the tube seat.

[0013] A method for using a device for easily inserting fillet weld TOFD detection comprises the following steps:

[0014] a. Insert the pipe seat into the inner side of the pipe, and then make the center of the pipe seat correspond to the center of the pipe. At this time, the guide rail can drive the pipe seat to rotate;

[0015] b. The guide rail rotates to drive the encoder, the first probe and the second probe to move, and detect the weld between the pipe and the cylinder;

[0016] c. The threaded rod can be further rotated to drive the spiral ring tube to move downward through the threaded part, and the spiral ring tube drives the support rod to rotate through the connecting plate, and the support rod drives the wear-resistant steel block to be in close contact with the inner wall of the pipe;

[0017] d. The support rod can effectively limit the left and right shaking of the pipe seat. The wear-resistant steel block is a spherical structure, and the friction between the wear-resistant steel block and the inner wall of the pipe is small. At the same time, the rotation of the ball can effectively reduce the sliding friction between the lower surface of the pipe seat and the external object during the rotation of the pipe seat.

[0018] e. When inspecting the welds of other pipes and cylinders of the same specifications, the support rod can be directly pressed against the inner wall of the pipe. At this time, the center of the pipe seat and the center of the pipe can be automatically aligned.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By providing a pipe seat, an adjusting threaded rod, a spiral ring tube, a connecting plate and a support rod, it is easy to avoid only linear movement during detection and not being able to make circumferential movement along the weld, so that the probe and the weld can be detected vertically. The device can easily rotate the guide rail through the pipe seat, and can move circumferentially along the connecting pipe to ensure that the probe is perpendicular to the weld, thereby increasing the use effect of the device. By providing a ball, a limit baffle and a connecting screw, it is easy to avoid a large contact and sliding friction between the lower surface of the pipe seat and the outer object during the rotation of the pipe seat itself, thereby affecting the rotation effect of the pipe seat, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the tube base of the present invention;

[0023] Figure 3 For the present invention Figure 2 A schematic diagram of the cross-sectional structure at point A;

[0024] Figure 4 It is a schematic diagram of the support rod structure of the present invention;

[0025] In the figure: 1. pipe seat; 2. connecting pipe; 3. cylinder; 5. roller; 6. guide rail; 7. encoder; 8. first probe; 9. guide groove; 10. second probe; 13. adjusting threaded rod; 14. support rod; 15. connecting ring; 16. connecting plate; 17. screw ring cylinder; 18. ball bearing; 19. limit baffle; 20. connecting screw; 21. wear-resistant steel block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 4 The present invention provides a technical solution: a device for TOFD detection of fillet welds that is easy to insert, comprising a pipe 2 and a cylinder 3, the pipe 2 and the cylinder 3 are arranged side by side, the pipe 2 and the cylinder 3 are fixed by welding, a pipe seat 1 is arranged on the inner side of the pipe 2, a guide rail 6 is fixed on one side of the pipe seat 1, the lower surface of the guide rail 6 includes an encoder 7, a first probe 8 and a second probe 10, the first probe 8 and the second probe 10 are arranged side by side, an encoder 7 is arranged on one side of the first probe 8, an adjusting threaded rod 13 is rotatably arranged on the inner side of the pipe seat 1, which is convenient for adjusting the height of the spiral ring cylinder 17, and the outer surface of the adjusting threaded rod 13 is passed through A spiral ring tube 17 is connected to the threaded portion, and a guide groove 9 is opened on one side wall of the tube seat 1 to guide the movement direction of the connecting plate 16. A connecting plate 16 is arranged on the inner side of the guide groove 9, and one end of the connecting plate 16 is matched with the spiral ring tube 17 through a first rotating rod to facilitate pushing the support rod 14 to rotate away from the tube seat 1. A support rod 14 is rotatably arranged on one end of the connecting plate 16, and a connecting ring 15 is fixed to one side wall of the tube seat 1. The support rod 14 and the connecting ring 15 are matched with each other through a second rotating rod to facilitate better movement of the support rod 14 away from the tube seat 1, and a ball mechanism is arranged on the lower surface of the tube seat 1.

[0028] Preferably, the ball mechanism includes a ball 18, a limit baffle 19 and a connecting screw 20. A limit baffle 19 is provided on the lower surface of the tube seat 1, and a connecting screw 20 is provided on the inner edge of the limit baffle 19. The limit baffle 19 and the tube seat 1 are connected by the connecting screw 20. A rotating groove is provided on the inner side of the limit baffle 19, and a ball 18 is provided on the inner side of the rotating groove, so as to reduce the contact friction between the lower surface of the tube seat 1 and the external object.

[0029] Preferably, the outer surface of the limiting baffle 19 is flush with the outer surface of the tube seat 1 , and a plurality of balls 18 are evenly distributed along the circumference of the limiting baffle 19 , so as to facilitate a better rotation effect of the tube seat 1 .

[0030] Preferably, the support rod 14 is a hollow structure, and a wear-resistant steel block 21 is fixed to one end of the support rod 14 to improve the wear resistance of one end of the support rod 14 .

[0031] Preferably, the wear-resistant steel block 21 is a spherical structure, which is convenient for reducing the contact area between the wear-resistant steel block 21 and the connecting pipe 2 and reducing friction. The outer diameter of the wear-resistant steel block 21 is one to five centimeters larger than the outer diameter of the support rod 14.

[0032] Preferably, a rotating disk is fixed to the top of the adjusting threaded rod 13 , and the rotating disk is circular, so as to better rotate the adjusting threaded rod 13 .

[0033] Preferably, one end of the guide rail 6 is connected to a roller 5 via a bracket, and the roller 5 is in contact with the cylinder 3 to better support one end of the guide rail 6.

[0034] Preferably, the tube base 1 is rectangular, and a plurality of first probes 8 and second probes 10 are provided along the long side of the tube base 1 to facilitate better detection effects.

[0035] A method for using a device for easily inserting fillet weld TOFD detection comprises the following steps:

[0036] a. Insert the tube holder 1 into the inner side of the tube 2, and then make the center of the tube holder 1 correspond to the center of the tube 2, then the guide rail 6 can drive the tube holder 1 to rotate;

[0037] b. The guide rail 6 rotates to drive the encoder 7, the first probe 8 and the second probe 10 to move, so as to detect the weld between the pipe 2 and the cylinder 3;

[0038] c. The threaded rod 13 can be further rotated to adjust the threaded rod 13, so that the threaded rod 13 drives the spiral ring tube 17 to move downward through the threaded portion, and the spiral ring tube 17 drives the support rod 14 to rotate through the connecting plate 16, and the support rod 14 drives the wear-resistant steel block 21 to be in close contact with the inner wall of the pipe 2;

[0039] d. The support rod 14 can effectively limit the left and right shaking of the pipe seat 1. The wear-resistant steel block 21 is a spherical structure. The wear-resistant steel block 21 has a small contact friction with the inner wall of the pipe 2. At the same time, the rotation of the ball 18 can effectively reduce the sliding friction between the lower surface of the pipe seat 1 and the external object during the rotation of the pipe seat 1.

[0040] e. When inspecting the weld between the pipe 2 and the cylinder 3 of the same specification, the support rod 14 can be directly attached to the inner wall of the pipe 2. At this time, the center of the pipe seat 1 and the center of the pipe 2 can be automatically aligned, further improving the inspection convenience.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for TOFD inspection of fillet welds that is easy to insert, comprising a pipe (2) and a cylinder (3), wherein the pipe (2) and the cylinder (3) are arranged side by side, and the pipe (2) and the cylinder (3) are fixed by welding, and characterized in that: A pipe seat (1) is arranged inside the pipe connection (2), a guide rail (6) is fixed to one side surface of the pipe seat (1), an encoder (7), a first probe (8) and a second probe (10) are included on the lower surface of the guide rail (6), the first probe (8) and the second probe (10) are arranged side by side, an encoder (7) is arranged on one side of the first probe (8), an adjusting threaded rod (13) is rotatably arranged inside the pipe seat (1), and a spiral ring tube (13) is connected to the outer surface of the adjusting threaded rod (13) via a threaded portion. 17), a guide groove (9) is provided on one side wall of the tube seat (1), a connecting plate (16) is provided inside the guide groove (9), one end of the connecting plate (16) is connected to the spiral ring tube (17) by a first rotating rod, a support rod (14) is rotatably provided on one end of the connecting plate (16), a connecting ring (15) is fixed on one side wall of the tube seat (1), the support rod (14) and the connecting ring (15) are connected by a second rotating rod, and a ball mechanism is provided on the lower surface of the tube seat (1).

2. The device for easily insertable fillet weld TOFD detection according to claim 1, characterized in that: The ball bearing mechanism comprises a ball bearing (18), a limit baffle (19) and a connecting screw (20); the limit baffle (19) is provided on the lower surface of the tube seat (1); the connecting screw (20) is provided on the inner edge of the limit baffle (19); the limit baffle (19) and the tube seat (1) are connected in a matching manner via the connecting screw (20); a rotation groove is provided on the inner side of the limit baffle (19); and the ball bearing (18) is provided on the inner side of the rotation groove.

3. The device for easily inserting fillet weld TOFD detection according to claim 2, characterized in that: The outer surface of the limit baffle (19) is flush with the outer surface of the tube seat (1), and a plurality of the balls (18) are evenly distributed along the circumference of the limit baffle (19).

4. The device for easily insertable fillet weld TOFD detection according to claim 1, characterized in that: The support rod (14) is a hollow structure, and a wear-resistant steel block (21) is fixed to one end of the support rod (14).

5. The device for easily insertable fillet weld TOFD detection according to claim 4, characterized in that: The wear-resistant steel block (21) is a spherical structure, and the outer diameter of the wear-resistant steel block (21) is one centimeter to five centimeters larger than the outer diameter of the support rod (14).

6. The device for easily insertable fillet weld TOFD detection according to claim 1, characterized in that: A rotating disk is fixed to the top end of the adjusting threaded rod (13), and the rotating disk is circular.

7. The device for easily insertable fillet weld TOFD detection according to claim 1, characterized in that: One end of the guide rail (6) is connected to a roller (5) via a bracket, and the roller (5) is in contact with the cylinder (3).

8. The device for easily insertable fillet weld TOFD detection according to claim 1, characterized in that: The tube seat (1) is rectangular, and a plurality of the first probes (8) and the second probes (10) are arranged along the long sides of the tube seat (1).

9. A method for using a device for easily insertable fillet weld TOFD detection according to any one of claims 1 to 8, characterized in that: The steps include: a. Insert the pipe seat (1) into the inner side of the pipe (2), and then make the center of the pipe seat (1) correspond to the center of the pipe (2), so that the guide rail (6) can drive the pipe seat (1) to rotate; b. The guide rail (6) rotates to drive the encoder (7), the first probe (8) and the second probe (10) to move, thereby detecting the weld between the pipe (2) and the cylinder (3); c. further rotating the adjusting threaded rod (13), so that the adjusting threaded rod (13) drives the spiral ring cylinder (17) to move downward through the threaded portion, and the spiral ring cylinder (17) drives the support rod (14) to rotate through the connecting plate (16), and the support rod (14) drives the wear-resistant steel block (21) to be in close contact with the inner wall of the pipe (2); d. The wear-resistant steel block (21) is supported by the support rod (14) and is of a spherical structure. The wear-resistant steel block (21) has a small contact friction with the inner wall of the connecting pipe (2), and the ball (18) rotates at the same time; e. When inspecting the weld between another pipe (2) and a cylinder (3) of the same specification, the support rod (14) can be directly placed against the inner wall of the pipe (2), and the center of the pipe seat (1) and the center of the pipe (2) can be automatically aligned.

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