Convenient weld joint flaw detection device

Abstract

The utility model relates to a convenient weld flaw detection device, which utilizes a cantilever and a lifting rod to support a probe, so that when a wounded detector changes a detection position, the probe can rotate around a collecting box only by pulling the probe, a flaw detection target is easily changed, the physical strength, time and difficulty consumed by the wounded detector to change the flaw detection position are greatly reduced, and the work efficiency is improved. And the working efficiency is improved. Wherein the clamping seat realizes the horizontal rotation function of the probe by using the rotary joint, realizes the swing of the probe in a vertical plane by using the hinged connecting plate and connecting seat, and realizes the autorotation of the probe by using the plurality of supporting rollers, so that the probe can still adjust the detection position of a pipe joint welding seam in the clamping seat; and the posture of the adjusted probe in the clamping seat is stable, so that the difficulty of adjusting and fixing the posture of the probe is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of flaw detection equipment, and particularly relates to a convenient weld flaw detection device. Background Art

[0002] A high-pressure heater is a device that uses part of the steam extraction of a steam turbine to heat feed water. As a heat conversion device, it is mainly applied to the regenerative system of large thermal power units. There are two main forms of high-pressure heaters, vertical and horizontal. Regardless of the horizontal form, there is at least one header and numerous heat exchange tubes communicating with the header inside. The ends of the heat exchange tubes are welded and connected to the header. To ensure the connection reliability and sealing performance between the heat exchange tubes and the header, each pipe joint weld needs to be subjected to radiographic non-destructive testing (also known as RT flaw detection). During the production process, the number of heat exchange tubes connected to the header is large and the spacing is small. If the joint welds are inspected after all the heat exchange tubes are welded, most of the pipe joints will be blocked and cannot be inspected. Therefore, it is necessary to perform weld flaw detection at intervals during the welding process.

[0003] The heat exchange tube joints on the header are circumferentially evenly distributed and axially arranged, and there is a certain angular misalignment in the circumferential direction between two adjacent rows of pipe joints arranged axially. This can improve the distribution density and uniformity of the pipe joints as much as possible. When connecting the heat exchange tubes, the staff starts from one end of the header and first welds the heat exchange tubes in a circle at the end of the header. After the flaw detector finishes the inspection, the second circle of axially adjacent heat exchange tubes is welded, and so on until all are welded.

[0004] When the header of a horizontal high-pressure heater is welded to the heat exchange tubes, it is in an upright state, and the heat exchange tubes are welded layer by layer from the bottom. When performing RT flaw detection on the welds of the header pipe joints conventionally, a backing plate is needed to lift the probe to a certain position, adjust the detection angle and fix it, then the person moves into the lead house, and then the host controls the probe to detect. For each detected position, the flaw detector needs to readjust the backing plate of the probe, and readjust the position and angle of the probe. The operation is very troublesome, the labor intensity of the flaw detector is high, and the detection efficiency is extremely low.

[0005] To sum up, there are many problems in the current flaw detection work for the joint welds between the header and the heat exchange tubes of a horizontal high-pressure heater, such as great work difficulty, high intensity, low efficiency, and easy fatigue of the flaw detector, which urgently need to be solved. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is: to provide a convenient weld flaw detection device, which solves the technical problems of great work difficulty, high intensity, low efficiency, and easy fatigue of the flaw detector in the current flaw detection work for the joint welds between the header and the heat exchange tubes of a horizontal high-pressure heater.

[0007] To solve the above technical problems, the technical solution adopted by the utility model is as follows: A weld flaw detection device is applied to the weld flaw detection of the pipe joint of the horizontal high-pressure heater header and the heat exchange tube. It includes a flaw detector and also includes a base connected to the top end of the vertically arranged header. A vertically arranged rotating shaft is connected to the base, and the rotating shaft is coaxial with the header. A sleeve is rotatably connected to the rotating shaft. A cantilever is perpendicularly connected to the outer wall of the sleeve, and the cantilever extends radially outward from the header. One end of the cantilever far from the rotating shaft is movably connected to a vertically arranged lifting rod, and the lifting rod can move up and down along its axis. The lifting rod is located outside the header. A probe clamping seat is connected to the lower end of the lifting rod. The probe clamping seat includes a rotary joint and a clamping ring. One end of the rotary joint is fixedly connected to a connecting pipe, and the other end is fixedly connected to a connecting plate. The clamping ring is formed by docking two half-rings. The top end of the upper half-ring is connected to a connecting seat, and the connecting seat is hinged to the connecting plate. Any half-ring includes two semi-circular end plates arranged oppositely and several support rollers connecting the two end plates. The two ends of the support roller are respectively rotatably connected to the two end plates. The two ends of the two end plates are respectively connected by a flange plate. The inscribed circle radius of the support roller is smaller than the minimum distance from the flange plate to the center of the clamping ring. All the support rollers are used to clamp the probe with a cylindrical shape. When the two half-rings are closed, the flange plates at both ends of the upper half-ring and the flange plates at both ends of the lower half-ring are exactly opposite and detachably connected to each other; the probe of the flaw detector is clamped in the clamping ring, the connecting pipe is detachably coaxially docked with the lower end of the lifting rod, and the axial direction of the clamping ring points to the central axis of the header.

[0008] As a preferred solution, a slider is axially slidably connected to the cantilever. A vertically arranged sliding sleeve is connected to the slider. One end of the sliding sleeve extends upward or downward out of the cantilever. The lifting rod is slidably connected in the sliding sleeve. A large number of discretely arranged positioning holes are axially evenly distributed on the outer wall of one side of the lifting rod. A locking hole matching the positioning hole is opened on the sliding sleeve. A locking pin for passing through the positioning hole to lock the lifting rod is inserted into the locking hole. A fixing bolt is also threadedly connected to the slider. When the fixing bolt is tightened, the top end of the fixing bolt abuts against the cantilever to limit the sliding of the slider.

[0009] As a preferred solution, the base includes a positioning ring adapted to the outer wall of the top end of the header and a base plate connected to the top end of the positioning ring. At least three threaded holes are axially evenly distributed on the positioning ring. A tightening screw is threadedly connected to each threaded hole. The base is buckled on the top end of the header, the positioning ring is sleeved on the outer wall of the top end of the header, and the end of the tightening screw abuts against the outer wall of the header. The rotating shaft is perpendicularly connected to the upper surface of the base plate.

[0010] As a preferred solution, the outer peripheral surface of the support roller is exposed on the side edge of the end plate facing the center of the clamping ring.

[0011] As a preferred solution, the connecting seat is hinged to the connecting plate through a hinge shaft. Two through holes symmetrically arranged on both sides of the hinge shaft are formed on the connecting plate. The centers of the two through holes and the center of the hinge shaft are at the same height. Two arc-shaped holes are formed on the connecting seat and are respectively arranged on both sides of the hinge shaft. The centers of the two arc-shaped holes are both centered on the hinge shaft. The lower ends of the two arc-shaped holes are respectively aligned with the two through holes. A locking bolt is detachably connected in the two through holes. The locking bolt passes through the corresponding arc-shaped hole and through hole to connect the connecting plate and the connecting seat together.

[0012] The beneficial effect of the utility model is that the weld flaw detection device of the utility model uses the cantilever and the lifting rod to support the probe. When the flaw detector changes the detection position, only by pulling the probe, the probe can rotate around the header, easily changing the flaw detection target, greatly reducing the physical strength, time and difficulty required for the flaw detector to change the flaw detection position, and improving the work efficiency.

[0013] The probe clamping seat of the utility model realizes the horizontal rotation function of the probe by using a rotary joint, realizes the swing of the probe in the vertical plane by using the hinged connecting plate and connecting seat, and realizes the self-rotation of the probe by using multiple support rollers. Therefore, the probe can still adjust the detection position of the pipe joint weld in the clamping seat. After adjustment, the posture of the probe in the clamping seat is stable, greatly reducing the difficulty of adjusting and fixing the probe posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, wherein:

[0015] Figure 1 is a schematic structural diagram of the weld flaw detection device of the present invention;

[0016] Figure 2 is Figure 1 an enlarged view of part A in

[0017] Figure 3 is a schematic structural diagram of the probe clamping seat of the present invention;

[0018] Figure 4 is Figure 3 the left view of

[0019] Figure 5 is a schematic structural diagram of the connecting plate of the present invention;

[0020] Figures 1 to 5In the figure: 1. Rotary joint; 2. Clamping ring; 2a. Half ring; 3. Connecting pipe; 4. Connecting plate; 5. Connecting seat; 6. End plate; 7. Support roller; 8. Flange plate; 9. Probe; 10. Hinge shaft; 11. Through hole; 12. Arc-shaped hole; 13. Locking bolt; 14. Header; 15. Base; 16. Rotating shaft; 17. Sleeve; 18. Cantilever; 19. Lifting rod; 20. Slide block; 21. Slide sleeve; 22. Positioning hole; 23. Locking hole; 24. Lock pin; 25. Fixing bolt; 26. Positioning ring; 27. Substrate; 28. Threaded hole; 29. Tightening screw. Detailed implementation manners

[0021] The following will describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings.

[0022] As Figures 1 to 5 shown, there is a weld flaw detection device, which is applied to the weld flaw detection of the welded joint between the header pipe joint of a horizontal high-pressure heater and the heat exchange pipe. As Figure 1 shown, the weld flaw detection device includes a flaw detector, and further includes a base 15 connected to the top end of a vertically arranged header 14. A vertically arranged rotating shaft 16 is connected to the base 15, and the rotating shaft 16 is coaxial with the header 14. A sleeve 17 is rotatably connected to the rotating shaft 16. A cantilever 18 is perpendicularly connected to the outer wall of the sleeve 17, and the cantilever 18 extends radially outward along the header 14. A vertically arranged lifting rod 19 is movably connected to the end of the cantilever 18 away from the rotating shaft 16, and the lifting rod 19 can move up and down along its axis. The lifting rod 19 is located outside the header 14. A probe holder 100 is connected to the lower end of the lifting rod 19. The probe holder 100 includes a rotary joint 1 and a clamping ring 2. One end of the rotary joint 1 is fixedly connected to a connecting pipe 3, and the other end is fixedly connected to a connecting plate 4. The clamping ring 2 is formed by butting two half rings 2a. The top end of the upper half ring 2a is connected to a connecting seat 5, and the connecting seat 5 is hinged to the connecting plate 4. Any one of the half rings 2a includes two semi-circular end plates 6 arranged oppositely and several support rollers 7 connecting the two end plates 6. Both ends of the support roller 7 are rotatably connected to the two end plates 6 respectively. Both ends of the two end plates 6 are connected through a flange plate 8 respectively. The inscribed circle radius of all the support rollers 7 is smaller than the minimum distance from the flange plate 8 to the center of the clamping ring 2. All the support rollers 7 are used to clamp the probe 9 with a cylindrical shape. When the two half rings 2a are closed, the flange plates 8 at both ends of the upper half ring 2a and the flange plates 8 at both ends of the lower half ring 2a are exactly opposite to each other and are detachably connected to each other through bolts. The probe 9 of the flaw detector is clamped in the clamping ring 2. The connecting pipe 3 is detachably and coaxially docked with the lower end of the lifting rod 19. The axial direction of the clamping ring 2 points to the central axis of the header 14. The main body of the flaw detector is carried by the flaw detector operator and is usually placed in a lead room, so it is not shown in the drawings.

[0023] The probe 9 is supported and clamped within the clamping ring 2 by multiple support rollers 7, and the support rollers 7 can all rotate on their own axes. Therefore, the inspector can twist the probe 9 to adjust the detection angle. Since the clamping ring 2 is connected to the rotary joint 1, the clamping ring 2 can rotate as a whole, driving the probe 9 to rotate within a plane perpendicular to the axis of the rotary joint 1 to adjust the detection position. Since the probe 9 is clamped by the clamping ring 2, and the clamping seat of the probe 9 can be connected to other fixing devices through the connecting pipe 3, after the probe 9 adjusts the detection position and angle, it can maintain its posture unchanged without the inspector having to fix the probe 9 separately, thus greatly improving the convenience of adjusting the flaw detection position of the probe 9.

[0024] To eliminate the interference between the end plate 6 and the outer wall of the probe 9, in this embodiment, the outer peripheral surface of the support roller 7 is exposed on the side edge of the end plate 6 facing the center of the clamping ring 2.

[0025] The connecting seat 5 is hinged to the connecting plate 4 through a hinge shaft 10. In this embodiment, two through holes 11 are further provided on the connecting plate 4 and are symmetrically arranged on both sides of the hinge shaft 2. The centers of the two through holes 11 and the center of the hinge shaft 10 are at the same height. Two arc-shaped holes 12 are provided on the connecting seat 5 and are respectively arranged on both sides of the hinge shaft 10. The two arc-shaped holes 12 are centered on the center of the hinge shaft 2. The lower ends of the two arc-shaped holes 12 are respectively aligned with the two through holes 11. A locking bolt 13 is detachably connected in the two through holes 11. The locking bolt 13 passes through the corresponding arc-shaped hole 12 and through hole 11 to connect the connecting plate 4 and the connecting seat 5 together.

[0026] When locking bolts 13 are provided in both of the two through holes 11, the axis of the clamping ring 2 can be kept perpendicular to the axis of the rotary joint 1. When any one of the locking bolts 13 is removed, the clamping ring 2 can swing around the hinge shaft 10 to further adjust the detection position of the probe within a plane parallel to the axis of the rotary joint, but the adjustment range is limited by the arc-shaped holes 12. When both of the locking bolts 13 are removed, the adjustment range of the detection position of the probe can be further expanded, but without the locking of the locking bolts 13, the posture of the probe 9 is not easily fixed, and the friction between the connecting plate 4 and the connecting seat 5 needs to be increased.

[0027] In this embodiment, a slider 20 is axially slidably connected to the cantilever 18. A vertically arranged sliding sleeve 21 is connected to the slider 20. One end of the sliding sleeve 21 extends upward or downward outside the cantilever 18. The slider 20 is used to adjust the position of the sliding sleeve 21 on the cantilever 18. The lifting rod 19 is slidably connected within the sliding sleeve 21. A large number of discretely arranged positioning holes 22 are axially evenly distributed on one outer wall of the lifting rod 19. A locking hole 23 that cooperates with the positioning holes 22 is formed in the sliding sleeve 21. A locking pin 24 for passing through the positioning holes 22 to lock the lifting rod 19 is inserted into the locking hole 23. When the locking pin 24 is pulled out, the lifting rod 19 can slide up and down relative to the sliding sleeve 21. When the locking pin 24 is inserted, the height of the lifting rod 19 can be locked. A fixing bolt 25 is also threadedly connected to the slider 20. When the fixing bolt 25 is tightened, the top end of the fixing bolt 25 abuts tightly against the cantilever 18 to restrict the sliding of the slider 20.

[0028] The base 15 described in this embodiment includes a positioning ring 26 adapted to the outer wall of the top end of the header 14 and a base plate 27 connected to the top end of the positioning ring 26. At least three threaded holes 28 are axially evenly distributed on the positioning ring 26. A tightening screw 29 is threadedly connected to each threaded hole 28. The base 15 is buckled on the top end of the header 14. The positioning ring 26 is sleeved on the outer wall of the top end of the header 14. The end of the tightening screw 29 abuts tightly against the outer wall of the header 14. The rotating shaft 16 is vertically connected to the upper surface of the base plate 27.

[0029] The working process of the present utility model is as follows: As Figures 1 to 5 shown, first, the weld flaw detection device is lifted and transported above the header 14. After adjusting the position, the base 15 is fixedly connected to the top end of the header 14. When connecting the base 15, the centering adjustment of the rotating shaft 16 is performed to make the rotating shaft 16 coaxial or substantially coaxial with the header 14. After the installation is completed, the probe 9 is installed in the clamping ring 2 of the probe holder 100. The position of the slider 20 is adjusted so that the pipe joint weld is within the detection range of the probe 9. Then, the locking pin 24 is pulled out, the lifting rod 19 is lifted, and then the locking pin 24 is inserted to perform the welding avoidance operation for the probe 9.

[0030] The welder welds the bottommost heat exchange tubes. After welding all the heat exchange tubes around the header 14, the welder leaves the site. The flaw detector pulls out and inserts the locking pin 24 again to adjust the height of the probe 9 so that the probe 9 descends to the detection range above the pipe joint weld to be detected. Then, the detection preparation for the first pipe joint weld is carried out. The detection preparation mainly adjusts the shooting position and angle of the probe 9. Specifically, the detection angle is adjusted by twisting the probe 9 to make it rotate self - axially. The forward - backward angle of the probe 9 is adjusted by swinging the clamping ring 2 up and down. The left - right yaw angle of the probe 9 is adjusted by horizontally rotating the clamping ring 2.

[0031] After the inspection preparation is completed, the inspector transfers to the lead room and controls the probe 9 through the main body of the flaw detector to inspect the weld seam. After the inspection is completed, the inspector adjusts the shooting position again and inspects the second position and the third position of the first pipe joint.

[0032] After the inspection of the weld seam of one pipe joint is completed, the inspector pulls the clamping ring 2 to make the entire cantilever 18 rotate around the rotating shaft 16, so as to move the probe 9 above the weld seam of the second pipe joint. Repeat the above steps to complete the RT non-destructive inspection of the weld seam of the second pipe joint, and then inspect the weld seam of the third pipe joint.

[0033] Repeat the above steps until the weld seams of all the pipe joints in a circle are inspected. Then lift the probe 9, and the welder often continues to weld the second layer of heat exchange pipes.

[0034] The probe clamping seat 100 of the present utility model utilizes the rotary joint 1 to realize the horizontal rotation function of the probe 9, utilizes the hinged connecting plate 4 and the connecting seat 5 to realize the swing of the probe 9 in the vertical plane, and utilizes multiple support rollers 7 to realize the self-rotation of the probe 9, so that the probe 9 can still adjust the inspection position of the weld seam of the pipe joint within the probe clamping seat 100. After adjustment, the posture of the probe 9 in the probe clamping seat 100 is stable, greatly reducing the difficulty of posture adjustment and fixation of the probe 9.

[0035] The weld flaw detection device of the present utility model uses the cantilever 18 and the lifting rod 19 to support the probe 9, so that when the inspector changes the inspection position, only by pulling the probe 9, the probe 9 can rotate around the header 14, easily changing the flaw detection target, greatly reducing the physical strength, time and difficulty required for the inspector to change the flaw detection position, and improving the work efficiency.

[0036] The above embodiments only illustrate the principles and effects of the present invention and some applied embodiments, rather than limiting the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A convenient weld flaw detection device, which is applied to the weld flaw detection of the welded joint between the header pipe joint of a horizontal high-pressure heater and the heat exchange tube, including a flaw detector, characterized in that, It further includes a base (15) connected to the top end of a vertically arranged header tank (14). A vertically arranged rotating shaft (16) is connected to the base (15). The rotating shaft (16) is coaxial with the header tank (14). A sleeve (17) is rotatably connected to the rotating shaft (16). A cantilever (18) is perpendicularly connected to the outer wall of the sleeve (17). The cantilever (18) extends radially outward along the header tank (14). A vertically arranged lifting rod (19) is movably connected to the end of the cantilever (18) away from the rotating shaft (16). The lifting rod (19) can move up and down along its axis. The lifting rod (19) is located outside the header tank (14). A probe holder (100) is connected to the lower end of the lifting rod (19). The probe holder (100) includes a rotary joint (1) and a clamping ring (2). One end of the rotary joint (1) is fixedly connected to a connecting pipe (3), and the other end is fixedly connected to a connecting plate (4). The clamping ring (2) is formed by docking two semi-rings (2a). A connecting seat (5) is connected to the top end of the semi-ring (2a) located above. The connecting seat (5) is hinged to the connecting plate (4). Any one of the semi-rings (2a) includes two relatively arranged semi-circular end plates (6) and several support rollers (7) connecting the two end plates (6). Both ends of the support roller (7) are rotatably connected to the two end plates (6). Both ends of the two end plates (6) are respectively connected by a flange plate (8). The inscribed circle radius of the support roller (7) is smaller than the minimum distance from the flange plate (8) to the center of the clamping ring (2). All the support rollers (7) are used to clamp a probe (9) with a cylindrical shape. When the two semi-rings (2a) are closed, the flange plates (8) at both ends of the semi-ring (2a) located above are exactly opposite to and detachably connected to the flange plates (8) at both ends of the semi-ring (2a) located below. The probe (9) of the flaw detector is clamped inside the clamping ring (2). The connecting pipe (3) is detachably and coaxially docked with the lower end of the lifting rod (19). The axial direction of the clamping ring (2) points to the central axis of the header tank (14).

2. The weld flaw detection device according to claim 1, characterized in that, A slider (20) is axially slidably connected to the cantilever (18). A vertically arranged sliding sleeve (21) is connected to the slider (20). One end of the sliding sleeve (21) extends upward or downward out of the cantilever (18). The lifting rod (19) is slidably connected inside the sliding sleeve (21). A large number of discretely arranged positioning holes (22) are axially evenly distributed on one side outer wall of the lifting rod (19). A locking hole (23) matching the positioning hole (22) is formed on the sliding sleeve (21). A locking pin (24) for passing through the positioning hole (22) to lock the lifting rod (19) is inserted into the locking hole (23). A fixing bolt (25) is also threadedly connected to the slider (20). When the fixing bolt (25) is tightened, the top end of the fixing bolt (25) abuts against the cantilever (18) to limit the sliding of the slider (20).

3. The weld flaw detection device according to claim 1, characterized in that, The base (15) includes a positioning ring (26) adapted to the outer wall of the top end of the header (14) and a base plate (27) connected to the top end of the positioning ring (26). At least three threaded holes (28) are evenly distributed axially on the positioning ring (26). A tightening screw (29) is threadedly connected in each threaded hole (28). The base (15) is buckled on the top end of the header (14). The positioning ring (26) is sleeved on the outer wall of the top end of the header (14). The end of the tightening screw (29) abuts against the outer wall of the header (14). The rotating shaft (16) is vertically connected to the upper surface of the base plate (27).

4. The weld flaw detection device according to claim 1, characterized in that, The outer peripheral surface of the support roller (7) is exposed at the edge of the end plate (6) facing the center of the clamping ring (2).

5. The weld flaw detection device according to claim 4, characterized in that, The connecting seat (5) is hinged to the connecting plate (4) through a hinge shaft (10). Two through holes (11) symmetrically arranged on both sides of the hinge shaft (10) are formed in the connecting plate (4). The centers of the two through holes (11) and the center of the hinge shaft (10) are at the same height. Two arc-shaped holes (12) are formed in the connecting seat (5) and are respectively arranged on both sides of the hinge shaft (10). The two arc-shaped holes (12) are centered on the center of the hinge shaft (10). The lower ends of the two arc-shaped holes (12) are respectively aligned with the two through holes (11). A locking bolt (13) is detachably connected in the two through holes (11). The locking bolt (13) passes through the corresponding arc-shaped hole (12) and through hole (11) to connect the connecting plate (4) and the connecting seat (5) together.

Images