Open type pipeline circumferential weld TOFD detection scanning device and working method

Abstract

The invention relates to an open type pipeline circumferential weld TOFD (Time of Flight Diffraction) detection scanning device and a working method thereof, the open type pipeline circumferential weld TOFD detection scanning device is suitable for PE (Poly Ethylene) pipelines and other non-magnetic pipelines, can also be used for ferromagnetic pipelines, and is characterized by comprising a basic frame, a lever mechanism and a locking mechanism, a TOFD probe used for pipeline circumferential weld detection is arranged on the basic frame and installed on a scanning component. Wherein the basic frame comprises a scanning part fixing piece for connecting a scanning part, a rubber wheel fixing piece, a first rubber wheel and a lever mechanism connecting piece; the open type TOFD detection scanning device for the circumferential weld of the pipeline is reasonable in design, and the firmness of the scanning device installed on the pipeline can be improved.

Description

Technical Field

[0001] The invention relates to a TOFD detection and scanning device for an open pipeline girth weld. Background Art

[0002] Pipeline weld inspection is an important means to ensure the safe operation of pipelines. PE pipes, which are widely used in urban gas pipeline networks, have excellent corrosion resistance, reliable welding sealing, good flexibility and convenient construction characteristics. PE pipes are generally connected by hot melting or electric melting. The welds formed inevitably have defects such as unfused joints, holes, inclusions, cracks, etc., which lead to gas leakage. Therefore, it is crucial to inspect the welds.

[0003] However, PE pipes are non-magnetic materials, and non-destructive testing scanning devices using magnetic wheel adsorption cannot be used on PE pipes. The existing full-chain clamping device is cumbersome to operate during use.

[0004] For example, the Chinese patent "An automatic scanning device for polyethylene pipe weld detection", announcement number CN215639956U, includes a laser positioning device, a first driven walking trolley, a connecting wheel frame, a probe scanning frame, a coding device, a second driven walking trolley, and an adjustment hook; the connecting wheel frame is a ring chain structure, and its head and tail parts are connected to each other by an adjustment hook; the first driven walking trolley and the second driven walking trolley are symmetrically installed at the outer ends of the connecting wheel frame, and the probe scanning frame is installed at the middle section of the connecting wheel frame between the first driven walking trolley and the second driven walking trolley; the laser positioning device is installed on the top of the first driven walking trolley, and the coding device is installed on the top of the second driven walking trolley. This patent can realize automatic mobile detection, real-time and accurate positioning through the laser positioning device, and automatic coding and coding through the encoder, avoiding misoperation, greatly improving detection efficiency and ensuring the validity of the detection results, but the installation firmness of the device is poor.

[0005] Another example is the Chinese patent "Ultrasonic Phased Array Detection Device for Defects of Polyethylene Pipe Hot Melt Joints," with publication number CN217237897U. In the scanning device, a brushless motor and a hand-cranked wheel are respectively connected to the driving wheel through a transmission assembly, and the driving wheel is connected to the driven wheel, which is fixed to a coupling; the ultrasonic phased array probe is fixed to the driven wheel, and the encoder is fixed to the scanning device, with the encoder shaft connected to the coupling; as the driving wheel drives the driven wheel to rotate, the encoder obtains rotation angle data, and the ultrasonic phased array probe follows the driven wheel around the surface of the pipeline to be inspected for scanning and inspection. Through this technical solution, the ultrasonic phased array probe can move more smoothly to achieve three-dimensional imaging of defects, more accurately locate defects, and improve detection accuracy, but the installation firmness of the device is poor. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an open-type pipeline girth weld TOFD inspection and scanning device and a working method thereof. The open-type pipeline girth weld TOFD inspection and scanning device is reasonably designed, which is conducive to improving the firmness of the scanning device installed on the PE pipeline.

[0007] The present invention is achieved through the following technical solutions: The TOFD inspection and scanning device for an open pipe girth weld of the present invention is characterized by comprising a basic frame, a lever mechanism and a locking mechanism, wherein a TOFD probe for inspecting the girth weld of a PE pipe is provided on the basic frame, and the probe is mounted on a scanning component; The basic frame includes a scanning component fixing member for connecting the scanning component, a rubber wheel fixing member, a first rubber wheel and a lever mechanism connecting member; The first through hole of the scanning component fixing member and the second through hole of the rubber wheel fixing member are fastened together by bolts; the rubber wheel fixing member is connected to the connecting member via the supporting member; the first rubber wheel and the rubber wheel fixing member are connected via the third through hole of the rubber wheel fixing member and the first bolt passing through the third through hole; the fourth through hole of the supporting member and the fifth through hole of the connecting member are hingedly connected by bolts passing through them; The lever mechanism includes a lever member, a connecting member and a clamping member; A threaded hole is provided in the middle of the lever member, and a sixth through hole is provided on both sides of the lever member; a second bolt passes through the threaded hole of the lever member and the seventh through hole of the rubber wheel fixing member from top to bottom, and a nut is provided at the lower end of the second bolt for fastening the lever member and the rubber wheel fixing member. The second bolt is rotated to adjust the distance between the lever member and the rubber wheel fixing member; The sixth through hole of the lever member is hingedly connected to the eighth through hole of the connecting member by a bolt, the sixteenth through hole of the connecting member is hingedly connected to the fifteenth through hole of the clamping member by a bolt, the fifth through hole of the connecting member is hingedly connected to the fourth through hole of the supporting member by a bolt, and the ninth through hole of the connecting member is fastened to the tenth through hole of the fixing member by a bolt; the lower end of the clamping member is hingedly connected to the eleventh through hole at one end of the adapter, and the other end of the adapter is connected to the second rubber wheel, and the first rubber wheel and the second rubber wheel are both pressed against the outer wall surface of the PE pipe; The locking mechanism includes a fixing member, a screw and a hemispherical nut threadedly connected to the screw; A boss is provided on the middle part of the fixing piece, and a twelfth through hole and a tenth through hole are provided at the upper and lower ends of the fixing piece. The tenth through hole at the lower end is fixedly connected to the ninth through hole of the connecting piece by bolts, so that the fixing piece and the connecting piece are relatively fixed; the twelfth through hole at the upper end and the thirteenth through hole at the first end of the screw are hinged by bolts, and the lower end face of the boss is pressed against the upper side edge of the connecting piece so that the fixing piece cannot rotate toward the rear (i.e. away from the fourteenth through hole); the second end of the screw passes through the fourteenth through hole on the upper lug of the clamp, and the spherical surface of the hemispherical nut is abutted against the port on the side of the fourteenth through hole close to the fixing piece, so that the screw and the lug on the upper part of the clamp are universally connected, so that the clamping degree of the clamp on the PE pipe can be smoothly adjusted by rotating the hemispherical nut.

[0008] Preferably, the scanning component includes a connecting rod, a probe clamp, a probe, an encoder clamp and an encoder; wherein the connecting rod is a square rod with a groove on each side, and the end of the probe clamp is slidably connected to the groove so that it can slide along the groove to a desired position; the probe clamp and the connecting rod are fastened by a nut; and the probe is installed at the lower end of the probe clamp.

[0009] Preferably, a square hole is provided on the side of the scanning component fixing piece, the end of one end of the connecting rod is inserted into the square hole, a through hole is provided on the wall of the square hole, and a bolt is connected in the through hole to tighten the connecting rod.

[0010] Preferably, square holes are respectively provided on the two end portions of the side of the above-mentioned fixing member, and connecting rods are connected to the two square holes. The two connecting rods are respectively equipped with probe clamps and probes, and the two probes are placed facing each other; the encoder clamp is slidably connected to the groove of the connecting rod and moves to the desired position through the groove, and the encoder is connected to the encoder clamp.

[0011] Preferably, the rubber wheel fixing member is composed of two symmetrically stacked pieces, which form the seventh through hole and the first through hole. The seventh through hole is relatively perpendicular to the second through hole.

[0012] Preferably, a pre-compression spring is provided between the lever member and the rubber wheel fixing member to restore the position between the lever member and the rubber wheel fixing member when the bolt is loosened.

[0013] Preferably, the sixteenth through hole of the connecting member exceeds the outer diameter of the pipe; the angle of the second rubber wheel clamped by the clamping members on both sides is less than or equal to 120 degrees to ensure that the scanning device does not fall off.

[0014] The working method of the TOFD inspection and scanning device for an open pipeline girth weld of the present invention is characterized by: (1) Assemble the scanning device; (2) Place the scanning device on the weld area of ​​the PE pipe to be inspected; (3) Adjust the hemispherical nut and clamp the PE pipe through the clamping piece and the second rubber wheel; (4) Adjust the second bolt to move the lever downward. Under the action of the lever of the support member, the end of the connector away from the second bolt rotates upward, lifting the clamping member to further clamp the PE pipe.

[0015] The present invention uses a multi-lever mechanism to achieve TOFD inspection and scanning of non-magnetic PE pipe girth welds. The device can be rigidly connected to the pipeline, ensuring that the probe and encoder clamped by the scanning device can rotate 360 ​​degrees along the pipeline without falling, greatly improving the firmness of the scanning device installed on the PE pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention in an assembled state; Figure 2 yes Figure 1 Schematic diagram of the main structure after omitting the component scanning component fixings; Figure 3 、 Figure 4 yes Figure 2 A partial view of Figure 5 It is a schematic diagram of the main structure of the clamping member; Figure 6 It is a schematic diagram of the main structure of the connector; Figure 7 It is a schematic diagram of the cross-sectional structure of the connection between the lever member and the bolt; Figure 8 1. It is a schematic diagram of a top view of the connection between the lever member, the connecting member and the clamping member; Figure 9 It is a schematic diagram of the main structure of the locking mechanism; Figure 10 yes Figure 9 Exploded diagram; Figure 11 is a side sectional view of the fixing member; Figure 12 This is a schematic diagram of the main structure of the assembly of the scanning component fixing parts and the rubber wheel fixing parts; Figure 13 yes Figure 12 Exploded diagram; Figure 14 It is a main cross-sectional view of the rubber wheel fixing part; Figure 15 It is a top view schematic diagram of the assembly of the scanning component fixing part and the rubber wheel fixing part; Figure 16 This is a schematic diagram of the structure connecting the connecting rod with the probe, encoder, etc.

[0017] Figure 17This is a front view of the connection structure between the support member and the first rubber wheel; Figure 18 is a top cross-sectional view of the connection between the support member and the first rubber wheel; Figure 19 It is a top cross-sectional view of the connection between the adapter and the second rubber wheel. DETAILED DESCRIPTION

[0018] The present invention is further explained below with reference to specific embodiments and accompanying drawings.

[0019] The TOFD inspection and scanning device for an open-type pipeline girth weld of the present invention includes a basic frame 1, a lever mechanism 2, and a locking mechanism 4. A TOFD probe (a TOFD probe is also an ultrasonic detection probe, which adopts the component used in ultrasonic diffraction time difference (TOFD) detection technology and is mainly used to transmit and receive ultrasonic signals to achieve quantitative detection and positioning of internal defects (such as cracks, pores, inclusions, etc.) of the material) and an encoder 36 are provided on the basic frame 1. The probe 33 (also known as the TOFD probe) and the encoder 36 are installed on the scanning component 3.

[0020] The basic frame 1 includes a scanning component fixing member 11 for connecting the scanning component 3 , a rubber wheel fixing member 12 , a first rubber wheel 14 and a lever mechanism connecting member 13 .

[0021] The first through hole 112 in the middle of the scanning component fixing part 11 and the second through hole 121 of the rubber wheel fixing part 12 are fastened together by bolts to fix the scanning component fixing part 11 and the rubber wheel fixing part 12. The scanning component fixing part 11 has two groups and is symmetrically arranged on both sides of the rubber wheel fixing part 12.

[0022] The rubber wheel fixing member 12 is connected to the connecting member 22 through the support member 13; the first rubber wheel 14 is connected to the rubber wheel fixing member 12 through the third through hole 122 of the rubber wheel fixing member 12 and the first bolt 131 passing through the third through hole 122; the fourth through hole 132 of the support member 13 and the fifth through hole 222 of the connecting member 22 are hingedly connected by bolts passing through them.

[0023] The lever mechanism 2 includes a lever member 21 , a connecting member 22 and a clamping member 23 .

[0024] The lever member 21 is in the shape of a Chinese character "F", and a threaded hole 211 is provided in the middle of the lever member 21, and a sixth through hole 212 is provided on both sides of the lever member 21; a second bolt 213 passes through the threaded hole 211 of the lever member 21 and the seventh through hole 123 of the rubber wheel fixing member 12 from top to bottom, and a nut is provided at the lower end of the second bolt 213, which abuts against the bottom surface 124 of the rubber wheel fixing member 12 to fasten the lever member 21 and the rubber wheel fixing member 12. When the second bolt 213 is rotated, the distance between the lever member 21 and the rubber wheel fixing member 12 can be adjusted. A pre-compression spring can be provided between the lever member 21 and the rubber wheel fixing member 12. Figure 1 When the second bolt 213 is rotated clockwise, the distance between the lever member 21 and the rubber wheel fixing member 12 is shortened. When the second bolt 213 is rotated counterclockwise, the distance between the lever member 21 and the rubber wheel fixing member 12 is increased.

[0025] The sixth through hole 212 of the lever member 21 is hinged to the eighth through hole 221 of the connecting member 22 by bolts, the sixteenth through hole 223 of the connecting member 22 is hinged to the fifteenth through hole 232 on the upper part of the clamping member 23 by bolts, the fifth through hole 222 of the connecting member 22 is hinged to the fourth through hole 132 on the upper part of the support member 13 by bolts, and the ninth through hole 224 of the connecting member 22 is fastened to the tenth through hole 411 on the lower part of the fixing member 41 by bolts; the lower end of the clamping member 23 is hinged to the eleventh through hole 241 at one end of the adapter 24, and the other end of the adapter 24 is connected to the second rubber wheel 141, and the first rubber wheel 14 and the second rubber wheel 141 are both pressed against the outer wall surface of the PE pipe.

[0026] The locking mechanism 4 includes a fixing member 41 , a screw rod 42 and a hemispherical nut 43 threadedly connected to the screw rod 42 .

[0027] A boss 413 is provided on the middle part of the fixing member 41, and a twelfth through hole 412 and a tenth through hole 411 are provided on the upper and lower ends of the fixing member 41. The tenth through hole 411 at the lower end is fixedly connected with the ninth through hole 224 of the connecting member 22 by a bolt, so that the fixing member 41 and the connecting member 22 are relatively fixed; the twelfth through hole 412 at the upper end is hinged with the thirteenth through hole 421 at the first end of the screw rod 42 by a bolt, and the lower end surface 414 of the boss 413 is pressed against the upper side of the connecting member 22 to The fixing part 41 cannot be rotated toward the rear side, that is, away from the fourteenth through hole 231; the second end of the screw 42 passes through the fourteenth through hole 231 on the upper lug of the clamping part 23, and the spherical surface of the hemispherical nut 43 abuts against the port on the side of the fourteenth through hole 231 close to the fixing part 41, thereby realizing a universal connection between the screw 42 and the clamping part 23 and the lug 234 on its upper part. Through this design, the clamping degree of the clamping part 23 on the PE pipe can be smoothly adjusted when the hemispherical nut 43 is rotated.

[0028] When the locking mechanism 4 is not present, the remaining structures of the present application can also achieve clamping of the PE pipe, but the clamping stability is poor, especially when the mechanism rotates circumferentially around the weld seam, the mechanism is easy to loosen, and continuous and stable scanning cannot be guaranteed, thereby affecting the detection accuracy.

[0029] The scanning component 3 includes a connecting rod 31, a probe clamping frame 32, a probe 33, an encoder clamping member 35 and an encoder 36; the connecting rod 31 is a square rod, each side of the square rod is provided with a groove arranged along the length direction, the end of the probe clamping frame 32 is slidably connected to the groove so that it can slide along the groove to the desired position. After the position is determined, the connecting rod 31 and the probe clamping frame 32 can be locked by bolts, and the probe 33 is installed at the lower end of the probe clamping frame 32.

[0030] Similarly, the encoder clamp 35 is slidably connected to the groove of the connecting rod 31, and is moved to the desired position through the groove, and then locked by bolts. The encoder 36 is connected to the encoder clamp, and the encoder 36 and the probe 33 perform TOFD detection, which is an existing detection technology and will not be repeated here.

[0031] A square hole 111 is provided on the side of the scanning component fixing part 11, and the end of one end of the connecting rod 31 is inserted into the square hole 111. A through hole is provided on the wall of the square hole 111, and a bolt is connected in the through hole to tighten the connecting rod 31 to achieve relative tightening of the connecting rod 31 and the scanning component fixing part 11.

[0032] The fixing member 11 has two side ends with square holes 111 , each of which is connected to a connecting rod 31 . The two connecting rods are respectively equipped with a probe holder 32 and a probe 33 , and the two probes are placed facing each other.

[0033] For a reasonable design, the rubber wheel fixing member 12 is composed of two identical and symmetrical stacked pieces, which form the seventh through hole 123 and the first through hole 112 . The seventh through hole 123 is relatively perpendicular to the second through hole 121 .

[0034] The working method of the TOFD inspection and scanning device for open pipe girth welds of the present invention is as follows: 1. Assemble the scanning device according to the above structure; 2. Place the scanning device on the annular weld area of ​​the PE pipe to be inspected; 3. Adjust the hemispherical nut 43 to clamp the PE pipe through the clamping piece 23 and the second rubber wheel 141; 4. Adjust the second bolt 213 to move the lever 21 downward. Under the lever action of the support member 13, the end of the connecting member 22 away from the second bolt 213 rotates upward, lifting the clamping member 23 to further clamp the PE pipe. 5. The sixteenth through hole 223 of the installed connecting piece 22 must exceed the outer diameter of the pipe; the angle between the second rubber wheels 141 clamped by the clamping pieces 23 on both sides must be less than or equal to 120 degrees to ensure that the scanning device does not fall off.

[0035] The present invention uses a multi-lever mechanism to realize TOFD inspection and scanning of non-magnetic PE pipe girth welds. The device can be rigidly connected to the pipeline, ensuring that the probe and encoder clamped by the scanning device can rotate 360 ​​degrees along the pipeline without falling, greatly improving the firmness of the scanning device installed on the PE pipeline.

[0036] The above is only a preferred embodiment of the present invention. Without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A TOFD inspection and scanning device for an open pipe girth weld, characterized by: The invention comprises a basic frame (1), a lever mechanism (2) and a locking mechanism (4), wherein a TOFD probe for detecting the girth weld of a PE pipe is provided on the basic frame (1), and the probe (33) is installed on the scanning component (3); The basic frame (1) includes a scanning component fixing member (11) for connecting the scanning component (3), a rubber wheel fixing member (12), a first rubber wheel (14) and a lever mechanism connecting member (13); The first through hole (112) of the scanning component fixing member (11) and the second through hole (121) of the rubber wheel fixing member (12) are fastened and connected by bolts; the rubber wheel fixing member (12) is connected to the connecting member (22) through the supporting member (13); the first rubber wheel (14) and the rubber wheel fixing member (12) are connected through the third through hole (122) of the rubber wheel fixing member (12) and the first bolt (131) passing through the third through hole (122); the fourth through hole (132) of the supporting member (13) and the fifth through hole (222) of the connecting member (22) are hingedly connected by bolts passing through them; The lever mechanism (2) includes a lever member (21), a connecting member (22) and a clamping member (23); A threaded hole (211) is provided in the middle of the lever member (21), and sixth through holes (212) are provided on both sides of the lever member (21); a second bolt (213) passes through the threaded hole (211) of the lever member (21) and the seventh through hole (123) of the rubber wheel fixing member (12) from top to bottom, and a nut is provided at the lower end of the second bolt (213) for fastening the lever member (21) and the rubber wheel fixing member (12); the second bolt (213) is rotated to adjust the distance between the lever member (21) and the rubber wheel fixing member (12); The sixth through hole (212) of the lever member (21) and the eighth through hole (221) of the connecting member (22) are hinged by bolts, the sixteenth through hole (223) of the connecting member (22) and the fifteenth through hole (232) of the clamping member (23) are hinged by bolts, the fifth through hole (222) of the connecting member (22) and the fourth through hole (132) of the supporting member (13) are hinged by bolts, and the ninth through hole (224) of the connecting member (22) and the tenth through hole (411) of the fixing member (41) are fastened by bolts; the lower end of the clamping member (23) is hinged to the eleventh through hole (241) at one end of the adapter (24), and the other end of the adapter (24) is connected to the second rubber wheel (141), and the first rubber wheel (14) and the second rubber wheel (141) are both pressed against the outer wall surface of the PE pipe; The locking mechanism (4) includes a fixing member (41), a screw (42), and a hemispherical nut (43) threadedly connected to the screw (42); A boss (413) is provided on the middle portion of the fixing member (41), and a twelfth through hole (412) and a tenth through hole (411) are provided at the upper and lower ends of the fixing member (41). The tenth through hole (411) at the lower end is fixedly connected to the ninth through hole (224) of the connecting member (22) by a bolt, thereby achieving relative fixation of the fixing member (41) and the connecting member (22); the twelfth through hole (412) at the upper end is hinged to the thirteenth through hole (421) at the first end of the screw rod (42) by a bolt, and the lower end surface of the boss (413) is pressed against the upper end of the connecting member (22). The second end of the screw rod (42) passes through the fourteenth through hole (231) on the upper lug of the clamping member (23), and the spherical surface of the hemispherical nut (43) abuts against the port on the fourteenth through hole (231) close to the fixing member (41), thereby realizing a universal connection between the screw rod (42) and the lug (234) on the upper part of the clamping member (23), so as to smoothly adjust the clamping degree of the clamping member (23) on the PE pipe by rotating the hemispherical nut (43).

2. The TOFD inspection and scanning device for open pipe girth welds according to claim 1, characterized in that: The scanning component (3) includes a connecting rod (31), a probe clamping frame (32), a probe (33), an encoder clamping member (35) and an encoder (36); wherein the connecting rod (31) is a square rod with a groove on each side, and the end of the probe clamping frame (32) is slidably connected to the groove so as to be able to slide along the groove to a desired position; the probe (33) is installed at the lower end of the probe clamping frame (32).

3. The TOFD inspection and scanning device for an open pipe girth weld according to claim 2, characterized in that: A square hole (111) is provided on the side of the scanning component fixing piece (11), and the end of one end of the connecting rod (31) is inserted into the square hole (111). A through hole is provided on the wall of the square hole (111), and a bolt is connected in the through hole to tighten the connecting rod (31) to tighten it.

4. The TOFD inspection and scanning device for an open pipe girth weld according to claim 3, characterized in that: The fixing member (11) is provided with square holes (111) at both ends of the side surface, and a connecting rod (31) is connected to each of the two square holes (111). The two connecting rods are respectively provided with a probe clamping frame (32) and a probe (33), and the two probes are placed facing each other; the encoder clamping member (35) is slidably connected to the groove of the connecting rod (31) and moves to a desired position through the groove, and the encoder (36) is connected to the encoder clamping member.

5. The TOFD inspection and scanning device for an open pipe girth weld according to claim 1, characterized in that: The rubber wheel fixing member (12) is composed of two symmetrically stacked pieces, which form a seventh through hole (123) and a first through hole (112). The seventh through hole (123) is relatively perpendicular to the second through hole (121).

6. The TOFD inspection and scanning device for an open pipeline girth weld according to claim 1, characterized in that: A pre-compression spring is provided between the lever member (21) and the rubber wheel fixing member (12) so as to restore the lever member (21) and the rubber wheel fixing member (12) when the bolt (213) is loosened.

7. The TOFD inspection and scanning device for an open pipeline girth weld according to claim 1, characterized in that: The sixteenth through hole (223) of the connecting member (22) exceeds the outer diameter of the pipe; the second rubber wheel (141) clamped by the clamping members (23) on both sides has an angle of less than or equal to 120 degrees to ensure that the scanning device does not fall off.

8. A method for operating the TOFD inspection and scanning device for an open-type pipeline girth weld according to any one of claims 1 to 7, characterized in that: (1) Assemble the scanning device; (2) Place the scanning device on the weld area of ​​the PE pipe to be inspected; (3) Adjust the hemispherical nut (43) to clamp the PE pipe through the clamping member (23) and the second rubber wheel (141); (4) The second bolt (213) is adjusted to move the lever member (21) downward. Under the lever action of the support member (13), the end of the connecting member (22) away from the second bolt (213) rotates upward, lifting the clamping member (23) to further clamp the PE pipe.

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