A high-pressure gas pipeline flaw detection device

Abstract

This invention belongs to the field of pipeline flaw detection technology, specifically a high-pressure gas pipeline flaw detection device. Addressing the problem of existing flaw detection trolleys easily tilting during forward movement, the following solution is proposed: a mounting base with a U-shaped groove on its upper surface, the mounting base being a horizontally placed prismatic structure. Symmetrical inclined surfaces are reserved on both sides of the mounting base, and symmetrical support legs are provided at both ends of the two inclined surfaces. Symmetrical and vertically placed centering adjustment frames are fixed at both ends of the U-shaped groove. During use, when the mounting base tilts during device advancement, the component force generated by the counterweight ball under gravity quickly returns the mounting base to a horizontal state, ensuring that the device always advances along the lowest part of the pipeline. This facilitates position and orientation calculation and positioning, thereby improving the accuracy of flaw detection location.

Description

Technical Field

[0001] This invention relates to the field of pipeline flaw detection technology, and in particular to a high-pressure gas pipeline flaw detection device. Background Technology

[0002] The flaw detection equipment used in existing flaw detection methods also refers to pipeline inspection instruments. A pipeline inspection instrument is a device used for internal and external inspection of pipelines. The inspection objects are usually various types of pipelines, such as municipal pipe networks, petrochemical transmission pipe networks, water supply pipes, industrial and mining infrastructure pipelines, industrial transmission and storage pipelines, internal pipe networks of residential buildings, air conditioning exhaust and ventilation pipes, etc. Its function is to make a systematic and intuitive detection and judgment on a series of indicators such as aging, degree of damage, internal blockage, corrosion damage, and internal structure analysis of pipelines.

[0003] According to research, most existing pipeline flaw detection devices involve mounting the detector head on a forward-moving trolley and controlling the trolley to move forward in the pipeline. However, as the trolley moves forward in the pipeline, the unevenness of the pipe wall inevitably causes the trolley to tilt. In this case, calculating based on the distance traveled can easily lead to detection errors. Therefore, a new type of pipeline flaw detection device that can always keep the trolley moving horizontally is needed. Summary of the Invention

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure gas pipeline flaw detection device, comprising a mounting base with a U-shaped groove on its upper surface, the mounting base being a horizontally placed prismatic structure, both sides of the mounting base having symmetrical inclined surfaces, and the ends of the two inclined surfaces being respectively provided with symmetrical support legs, the ends of the U-shaped groove being respectively fixed with symmetrical and vertically placed centering adjustment frames, and the two centering adjustment frames being slidably connected to the same main drive shaft capable of horizontal up and down movement, the end of the main drive shaft protruding from the mounting base near the forward end being rotatably sleeved with a sliding sleeve, the outer wall of the sliding sleeve being fixed with a detection frame, the lower surface of the mounting base having a longitudinal notch in the middle, and the top inner wall of the notch being rotatably connected to a counterweight ball capable of swinging along the radial direction of the pipeline; the rear end of the mounting base having two parallel extension arms fixed near the bottom, and the ends of the two extension arms away from the mounting base being provided with a propulsion mechanism.

[0005] A further feature is that the propulsion mechanism includes two fixed frames that are symmetrically and vertically distributed at the ends of the extension arm. The interior of the two fixed frames is slidably connected to a sliding bearing seat near the bottom. The two sliding bearing seats can slide vertically up and down within the fixed frames. The two sliding bearing seats are rotatably connected to the same drive wheel. The outer wall of the drive wheel is fitted with a rubber ring. Compression springs are fixed between the top of the two sliding bearing seats and the top inner wall of the fixed frames.

[0006] A further feature is that each of the support legs includes a rectangular outer tube and an extension rod that slides onto the end of the rectangular outer tube. The end of the extension rod away from the mounting base has a roller groove, and a roller is provided in the roller groove. A buffer spring is fixed to the end of the extension rod near the mounting base, and a slider seat is fixed to the end of the buffer spring away from the extension rod. Both ends of the mounting base and the intersection of the inclined surface have rectangular grooves that are adapted to the outer dimensions of the rectangular outer tube.

[0007] A further feature is that both ends of the mounting base are equipped with adjustment mechanisms adapted to the support legs. Each adjustment mechanism includes a bearing mounting hole near the bottom of the mounting base, in which a sliding bearing is embedded. A shaft is rotatably connected within the sliding bearing, and an adjustment wheel is fixed to the end of the shaft. Two centrally symmetrically distributed push rods are rotatably connected to the circumferential edge of the adjustment wheel away from the mounting base. Each push rod has a horizontally movable extension plate seat hinged to its end away from the adjustment wheel. The two extension plate seats are symmetrically distributed and each has symmetrically arranged oblique guide holes. A protrusion is provided on the side of each extension plate seat near the mounting base, and a strip groove adapted to the protrusion is provided at the end of the mounting base. This ensures that when the extension plate seat is subjected to a thrust from the center to both sides, its final movement trajectory is horizontally moving to both sides. A strip hole is provided on the side of the rectangular outer tube away from the bottom of the groove, and a toggle protrusion extending from the strip hole is fixed on the slider seat. The toggle protrusion is slidably inserted into the oblique guide hole.

[0008] A further feature is that guide grooves are provided on opposite sides of the two centering adjustment frames, and symmetrical bearing seats are slidably connected in the two guide grooves. Symmetrical tapered roller bearings are respectively engaged in the two bearing seats, and the main drive shaft is rotatably connected between the two tapered roller bearings. It can bear axial thrust and maintain rotation and original position when the main drive shaft is subjected to axial thrust, without axial displacement. A cleaning device is fixed at the end of the main drive shaft away from the propulsion mechanism. The cleaning device includes a fixed plate, and three telescopic arms are fixed on the outer circumference of the fixed plate. Brush heads are fixed at the ends of the three telescopic arms.

[0009] A further feature is that the mounting base has vertical rectangular through holes on both sides of the U-shaped groove in the middle. A telescopic rod and a grooved slide rail with its opening facing the center are fixed in each of the two rectangular through holes. A boss slider is slidably connected in the grooved slide rail, and a radial bearing is fixed on the side of the boss slider away from the bottom of the groove. The main drive shaft is rotatably connected in the radial bearing. A fixed hanger is fixed to the top of the extension rod of the telescopic rod, and the end of the fixed hanger is fixed to the outer wall of the radial bearing. Through the grooved slide rail and the telescopic rod, the extension and retraction of the telescopic rod can be controlled during use to ensure that the main drive shaft remains on the centerline of the pipe even after the pipe diameter changes, resulting in more accurate detection results.

[0010] A further feature is that a geared motor is fixed to the top of the bearing housing two near the propulsion mechanism, and a drive pulley is fixed to the top of the output shaft of the geared motor. A driven pulley that is connected to the drive pulley is fixed to the outer wall of the main drive shaft directly below the drive pulley. The belt drive can protect the motor by utilizing its slippage performance.

[0011] A further feature is that each of the four corners of the boss slider near the bottom of the groove has a spherical groove, and each spherical groove is fitted with a ball. This ensures that the main drive shaft can rise horizontally even if the resistance at both ends of the main drive shaft is different when it is driven to rise.

[0012] A further feature is that the mounting base is equipped with a swing mechanism for controlling the sliding sleeve at one end near the sliding sleeve. The swing mechanism includes a servo motor fixed above the bearing seat at the same end. The output shaft of the servo motor passes through the centering adjustment frame and is fixed to an anti-slip rope wheel. Two fixed beams extending to both sides of the anti-slip rope wheel are fixed to the end of the servo motor near the output shaft. The ends of the two fixed beams are fixed with the same C-shaped steel wire guide rail with an upward opening. Steel wires slide through the steel wire guide rail and are wound in an inward V-shape on the outer wall of the anti-slip rope wheel. The steel wires can be moved by controlling the rotation of the anti-slip rope wheel. An arc-shaped hole is opened on the side of the steel wire guide rail near the detection frame, and a connecting post is fixed between the middle of the steel wire and the detection frame. The detection frame can be indirectly rotated around the main drive shaft at any angle by controlling the pulling of the steel wire.

[0013] A further feature is that the number of the detection frames is even, and all the detection frames are centrally symmetrically distributed; by setting the detection frames to rotate under the control of the swing mechanism, the detection frames can rotate less than 10 degrees to achieve all-round detection, avoiding the tangling of the lines.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. By using a counterweight ball located in the middle of the lower surface of the mounting base, when the mounting base tilts as the device moves forward, the component force generated by the counterweight ball under gravity will cause the mounting base to quickly return to a horizontal state. This ensures that the device always moves along the lowest part of the pipeline, which facilitates the calculation and positioning of the position and orientation, thereby improving the accuracy of the flaw detection location.

[0016] 2. By setting a sliding protrusion in the inclined guide hole, when it is necessary to control the extension rods on both sides to extend or retract during use, simply rotate the adjusting wheel. At this time, the two push rods can indirectly control the slider seat to move up and down inside the rectangular outer tube.

[0017] 3. With the addition of grooved slide rails and telescopic rods, the main drive shaft can remain on the center line of the pipe even after the pipe diameter changes, thus making the detection results more accurate.

[0018] 4. The detector frame, controlled by a swing mechanism, can rotate less than 180 degrees to achieve omnidirectional detection, thus avoiding the tangling of the circuit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a high-pressure gas pipeline flaw detection device proposed in this invention.

[0020] Figure 2 This is a side view of a high-pressure gas pipeline flaw detection device proposed in this invention;

[0021] Figure 3 This is a cross-sectional view of the pipeline during flaw detection using a high-pressure gas pipeline flaw detection device proposed in this invention.

[0022] Figure 4 This is a top view of a high-pressure gas pipeline flaw detection device proposed in this invention;

[0023] Figure 5 This is a schematic diagram of the drive end component of the main drive shaft in a high-pressure gas pipeline flaw detection device proposed in this invention.

[0024] Figure 6 This is a schematic diagram of the structure of a mounting base for a high-pressure gas pipeline flaw detection device proposed in this invention;

[0025] Figure 7 This is a schematic diagram of the installation structure of the support leg in a high-pressure gas pipeline flaw detection device proposed in this invention.

[0026] Figure 8 This is a schematic diagram of the swing mechanism in a high-pressure gas pipeline flaw detection device proposed in this invention.

[0027] In the diagram: 1. Mounting base; 101. Rectangular perforation; 102. U-shaped groove; 103. Rectangular groove; 104. Strip groove; 105. Bearing mounting hole; 2. Centering adjustment frame; 3. Guide slide groove; 4. Gear motor; 5. Drive pulley; 6. Grooved slide rail; 7. Servo motor; 8. Wire guide rail; 9. Brush head; 10. Main drive shaft; 11. Sliding sleeve; 12. Detector frame; 13. Adjusting wheel; 14. Extension plate seat; 15. Counterweight ball; 16. 17. Notch; 17. Support leg; 171. Slider seat; 172. Roller; 173. Extension rod; 18. Extension arm; 19. Sliding bearing seat one; 20. Drive wheel; 21. Compression spring; 22. Fixed frame; 23. Telescopic rod; 24. Fixed beam; 25. Anti-slip rope reel; 26. Fixed hanging rod; 27. Radial bearing; 28. Bearing seat two; 29. ​​Boss slider; 30. Angled guide hole; 31. Push rod; 32. Actuating protrusion; 33. Connecting column. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1

[0030] Reference Figure 1-7 A high-pressure gas pipeline flaw detection device includes a mounting base 1 with a U-shaped groove 102 on its upper surface. The mounting base 1 is a horizontally placed prismatic structure. Symmetrical inclined surfaces are reserved on both sides of the mounting base 1, and symmetrical support legs 17 are respectively provided at both ends of the two inclined surfaces. Symmetrical and vertically placed centering adjustment frames 2 are fixed at both ends of the U-shaped groove 102. A main drive shaft 10 capable of horizontal vertical movement is slidably connected between the two centering adjustment frames 2. A sliding sleeve 11 is rotatably sleeved at the end of the main drive shaft 10 near the forward end protruding from the mounting base 1. A detection frame 12 is fixed to the outer wall of the sliding sleeve 11. A longitudinal groove is opened in the middle of the lower surface of the mounting base 1. The mounting base 1 has a notch 16, and the inner wall of the notch 16 is rotatably connected to a counterweight ball 15 that can swing along the radial direction of the pipe. Two parallel extension arms 18 are fixed near the bottom of the rear end of the mounting base 1, and a propulsion mechanism is provided at the end of the two extension arms 18 away from the mounting base 1. Through the counterweight ball 15 located in the middle of the lower surface of the mounting base 1, when the mounting base is tilted as the device moves forward, the component force generated by the counterweight ball 15 under the action of gravity will make the mounting base 1 quickly return to a horizontal state, thereby ensuring that the device always moves along the lowest part of the pipe, so as to facilitate the calculation and positioning of position and orientation, thereby improving the accuracy of the flaw detection position.

[0031] The propulsion mechanism includes two symmetrical and vertically distributed fixed frames 22 fixed to the ends of the extension arm 18. Sliding bearing seats 19 are slidably connected to the interior of the two fixed frames 22 near the bottom. The two sliding bearing seats 19 can only slide vertically up and down within the fixed frames 22. The same drive wheel 20 is rotatably connected between the two sliding bearing seats 19. A rubber ring is fitted on the outer wall of the drive wheel 20. Compression springs 21 are fixed between the top of the two sliding bearing seats 19 and the top inner wall of the fixed frame 22. By setting the drive wheel 20, which can slide up and down within the fixed frame 22 and always rests against the bottom, the device can be provided with forward driving force and can easily avoid ditches or resistance.

[0032] Each support leg 17 includes a rectangular outer tube and an extension rod 173 that slides onto the end of the rectangular outer tube. The end of the extension rod 173 away from the mounting base 1 has a roller groove, and a roller 172 is provided in the roller groove. A buffer spring is fixed to the end of the extension rod 173 near the mounting base 1, and a slider seat 171 is fixed to the end of the buffer spring away from the extension rod 173. Both ends of the mounting base 1 and the intersection of the inclined surface have rectangular grooves 103 that are adapted to the outer dimensions of the rectangular outer tube. By using the slider seat 171 that can slide inside the rectangular outer tube, the extension length of the four extension rods 173 can be adjusted to adapt to target pipes of different diameters.

[0033] The mounting base 1 has adjustment mechanisms at both ends that are adapted to the support legs 17. Each adjustment mechanism includes a bearing mounting hole 105 located near the bottom of the mounting base 1. A sliding bearing is embedded in the bearing mounting hole 105, and a shaft is rotatably connected within the sliding bearing. An adjustment wheel 13 is fixed to the end of the shaft. Two centrally symmetrically distributed push rods 31 are rotatably connected to the circumferential edge of the adjustment wheel 13 away from the mounting base 1. Each push rod 31 has a horizontally movable extension plate seat 14 hinged to its end away from the adjustment wheel 13. The two extension plate seats 14 are symmetrically distributed and each has a symmetrically symmetrical oblique guide hole 30. The two extension plate seats 14 are located near the mounting base 1. One side of each of the mounting bases is provided with a protrusion, and the end of each mounting base 1 is provided with a strip groove 104 that matches the protrusion; this ensures that when the extension plate base 14 is subjected to a pushing force from the middle to both sides, the final movement trajectory is horizontal to both sides. The side of the rectangular outer tube away from the bottom of the groove is provided with a strip hole, and the slider base 171 is fixed with a toggle protrusion 32 that extends out of the strip hole; the toggle protrusion 32 is slidably inserted into the inclined guide hole 30; by setting the toggle protrusion 32 that is slidably sleeved in the inclined guide hole 30, when it is necessary to control the extension rods 173 on both sides to extend or retract during use, it is only necessary to rotate the adjusting wheel 13. At this time, the two push rods 31 can indirectly control the slider base 171 to move up and down in the rectangular outer tube.

[0034] The two centering adjustment frames 2 each have guide grooves 3 on opposite sides, and symmetrical bearing seats 28 are slidably connected in the two guide grooves 3. Symmetrical tapered roller bearings are respectively engaged in the two bearing seats 28. The main drive shaft 10 is rotatably connected between the two tapered roller bearings. It can bear axial thrust. When the main drive shaft 10 is subjected to axial thrust, it can still rotate and remain in its original position without axial displacement. A cleaning device is fixed at the end of the main drive shaft 10 away from the propulsion mechanism. The cleaning device includes a fixed plate, and three telescopic arms are fixed on the outer circumference of the fixed plate. Brush heads 9 are fixed at the ends of the three telescopic arms. By setting the rotatable brush heads 9, the area to be inspected can be thoroughly cleaned before flaw detection, avoiding errors in flaw detection results caused by contaminants on the pipe wall when taking X-rays.

[0035] The mounting base 1 has vertical rectangular through holes 101 on both sides of the U-shaped groove 102 in the middle. A telescopic rod 23 and a grooved slide rail 6 with the opening facing the middle are fixed in the two rectangular through holes 101 respectively. A boss slider 29 is slidably connected in the grooved slide rail 6. A radial bearing 27 is fixed on the side of the boss slider 29 away from the bottom of the groove. The main drive shaft 10 is rotatably connected in the radial bearing 27. A fixed hanger 26 is fixed at the top of the extension rod of the telescopic rod 23. The end of the fixed hanger 26 is fixed to the outer wall of the radial bearing 27. With the grooved slide rail 6 and the telescopic rod 23, the main drive shaft 10 can remain on the center line of the pipe after the pipe diameter of the target pipe changes by controlling the extension and retraction of the extension rod of the telescopic rod 23 during use, so that the main drive shaft 10 can remain on the center line of the pipe. This makes the detection results more accurate.

[0036] Among them, a geared motor 4 is fixed at the top of the bearing housing 28 near the propulsion mechanism, and a drive pulley 5 is fixed at the top of the output shaft of the geared motor 4. A driven pulley that is connected to the drive pulley 5 is fixed on the outer wall of the main drive shaft 10 directly below the drive pulley 5. The belt drive can protect the motor by utilizing its slippage performance.

[0037] Among them, the four corners of the boss slider 29 near the bottom of the groove are all provided with spherical grooves, and each spherical groove is filled with balls. This ensures that the main drive shaft 10 can rise horizontally even if the resistance at both ends of the main drive shaft 10 is different when it is driven to rise.

[0038] Example 2

[0039] Reference Figure 1 and Figure 8A high-pressure gas pipeline flaw detection device, based on Embodiment 1, designs a detection frame 12 that requires fewer probes. Specifically, the mounting base 1 has a swing mechanism controlling the sliding sleeve 11 at one end near the sliding sleeve 11. This swing mechanism includes a servo motor 7 fixed above the bearing seat 28 at the corresponding end. The output shaft of the servo motor 7 passes through the centering adjustment frame 2 and is fixed to an anti-slip rope winding wheel 25. Two fixing beams 24 extending to both sides of the anti-slip rope winding wheel 25 are fixed to the end of the servo motor 7 near the output shaft. Two fixed beams 24 are fixed to the ends of a C-shaped steel wire guide rail 8 with an upward opening. Steel wires slide through the steel wire guide rail 8 and are wound in an inward V-shape on the outer wall of the anti-slip rope wheel 25. The steel wires can be moved by controlling the rotation of the anti-slip rope wheel 25. An arc-shaped hole is opened on the side of the steel wire guide rail 8 near the detection frame 12, and a connecting post 33 is fixed between the middle of the steel wire and the detection frame 12. The detection frame 12 can be indirectly rotated around the main drive shaft 10 at any angle by controlling the pulling of the steel wire.

[0040] The number of detector frames 12 is even, and in this embodiment there are two, and all detector frames 12 are centrally symmetrically distributed. By setting the detector frames 12 to rotate under the control of the swing mechanism, the detector frames 12 can rotate less than 180 degrees to achieve all-round detection, avoiding the coiling of the line.

[0041] When using this device, first insert the end with the brush head 9 into the pipe to be tested as the forward end, and adjust the brush head 9 to have a certain pressure against the pipe wall. Then, control the extension length of the telescopic rod 23 to ensure that the height of the main drive shaft 10 is at the exact center of the pipe body, that is, coincides with the center line of the pipe body. Then, through the counterweight ball 15 set in the middle of the lower surface of the mounting base 1, when the mounting base is tilted as the device moves forward, the component force generated by the counterweight ball 15 under the action of gravity will make the mounting base 1 quickly return to a horizontal state, thereby ensuring that the device always moves along the lowest part of the pipe. After the forward position is determined, that is, the weld position, the flaw detection begins, and the position and orientation are calculated and located. Then, the probe head at the end of the probe frame 12 performs flaw detection on the target position. Through the probe frame 12, which is controlled by the swing mechanism to rotate, the probe frame 12 can rotate less than 180 degrees to achieve all-round detection and avoid the coiling of the line.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure gas pipeline flaw detection device, comprising a mounting base (1) with a U-shaped groove (102) on its upper surface, the mounting base (1) being a horizontally placed prismatic structure, both sides of the mounting base (1) having mutually symmetrical inclined surfaces, and the ends of the two inclined surfaces being respectively provided with mutually symmetrical support legs (17), the ends of the U-shaped groove (102) being respectively fixed with mutually symmetrical and vertically placed centering adjustment frames (2), and the two centering adjustment frames (2) being slidably connected to the same main drive shaft (10) capable of horizontally moving up and down, the end of the main drive shaft (10) protruding from the mounting base (1) near the forward end being rotatably sleeved with a sliding sleeve (11), the outer wall of the sliding sleeve (11) being fixed with a detection frame (12), characterized in that, The mounting base (1) has a longitudinal notch (16) in the middle of its lower surface, and a counterweight ball (15) that can swing along the radial direction of the pipe is rotatably connected to the top inner wall of the notch (16); the mounting base (1) has two parallel extension arms (18) fixed near the bottom at its tail end, and a propulsion mechanism is provided at the end of the two extension arms (18) away from the mounting base (1). The two centering adjustment frames (2) have guide grooves (3) on opposite sides, and the two guide grooves (3) are respectively slidably connected to the bearing seats (28), and the two bearing seats (28) are respectively clamped with tapered roller bearings. The main drive shaft (10) is rotatably connected between the two tapered roller bearings. The end of the main drive shaft (10) away from the propulsion mechanism is fixed with a cleaning device, and the cleaning device includes a fixed plate. The outer circumference of the fixed plate is fixed with three telescopic arms that are centrally symmetrically distributed. The ends of the three telescopic arms are all fixed with brush heads (9). The mounting base (1) has vertical rectangular through holes (101) on both sides of the U-shaped groove (102) in the middle. A telescopic rod (23) and a grooved slide rail (6) with the opening facing the middle are fixed in the two rectangular through holes (101), and a boss slider (29) is slidably connected in the grooved slide rail (6). A radial bearing (27) is fixed on the side of the boss slider (29) away from the bottom of the groove. The main drive shaft (10) is rotatably connected in the radial bearing (27). A fixed hanger (26) is fixed at the top of the extension rod of the telescopic rod (23). The end of the fixed hanger (26) is fixed to the outer wall of the radial bearing (27). A geared motor (4) is fixed at the top of the bearing housing 2 (28) near the propulsion mechanism, and a drive pulley (5) is fixed at the top of the output shaft of the geared motor (4). A driven pulley that is connected to the drive pulley (5) is fixed on the outer wall of the main drive shaft (10) directly below the drive pulley (5). The mounting base (1) is provided with a swing mechanism for controlling the sliding sleeve (11) at one end near the sliding sleeve (11). The swing mechanism includes a servo motor (7) fixed above the bearing seat (28) at the end. The output shaft of the servo motor (7) passes through the centering adjustment frame (2) and is fixed with an anti-slip rope wheel (25). Two fixed beams (24) extending to both sides of the anti-slip rope wheel (25) are fixed at one end of the servo motor (7) near the output shaft. The ends of the two fixed beams (24) are fixed with the same wire guide rail (8) with an upward-facing C-shaped structure. A wire is slidably inserted in the wire guide rail (8). The wire is wound in an inward V-shape on the outer wall of the anti-slip rope wheel (25). An arc-shaped hole is opened on the side of the wire guide rail (8) near the detection frame (12). A connecting column (33) is fixed between the middle of the wire and the detection frame (12).

2. The high-pressure gas pipeline flaw detection device according to claim 1, characterized in that, The propulsion mechanism includes two fixed frames (22) that are symmetrically and vertically distributed at the ends of the extension arm (18). The two fixed frames (22) are slidably connected to the bottom of the frame. The two sliding bearing seats (19) can only slide vertically up and down within the fixed frame (22). The two sliding bearing seats (19) are rotatably connected to the same drive wheel (20). The outer wall of the drive wheel (20) is fitted with a rubber ring. The top of the two sliding bearing seats (19) and the top inner wall of the fixed frame (22) are both fixed with compression springs (21).

3. The high-pressure gas pipeline flaw detection device according to claim 1, characterized in that, Each of the support legs (17) includes a rectangular outer tube and an extension rod (173) that slides onto the end of the rectangular outer tube. The end of the extension rod (173) away from the mounting base (1) is provided with a roller groove and a roller (172) is provided in the roller groove. A buffer spring is fixed at the end of the extension rod (173) near the mounting base (1) and a slider seat (171) is fixed at the end of the buffer spring away from the extension rod (173). Rectangular grooves (103) that are adapted to the outer dimensions of the rectangular outer tube are provided at both ends of the mounting base (1) and the intersection of the inclined surface.

4. The high-pressure gas pipeline flaw detection device according to claim 3, characterized in that, Both ends of the mounting base (1) are provided with adjustment mechanisms adapted to the support legs (17). The adjustment mechanism includes a bearing mounting hole (105) opened at the end of the mounting base (1) near the bottom. A sliding bearing is embedded in the bearing mounting hole (105). A shaft is rotatably connected inside the sliding bearing. An adjustment wheel (13) is fixed at the end of the shaft. Two push rods (31) are rotatably connected to the circumferential edge of the adjustment wheel (13) away from the mounting base (1). The ends of the two push rods (31) away from the adjustment wheel (13) are hinged. There are two extension plate seats (14) that move horizontally to both sides. The two extension plate seats (14) are symmetrically distributed and have symmetrical oblique guide holes (30) on each of the two extension plate seats (14). Both extension plate seats (14) have protrusions on the side near the mounting base (1) and the end of the mounting base (1) has a strip groove (104) that matches the protrusion. The rectangular outer tube has a strip hole on the side away from the bottom of the groove and a toggle protrusion (32) that extends out of the strip hole is fixed on the slider seat (171). The toggle protrusion (32) slides into the oblique guide hole (30).

5. A high-pressure gas pipeline flaw detection device according to claim 1, characterized in that, The boss slider (29) has spherical grooves at the four corners of the side near the bottom of the groove, and each spherical groove is fitted with a ball.

6. The high-pressure gas pipeline flaw detection device according to claim 1, characterized in that, The number of the probe frames (12) is an even number, and all the probe frames (12) are centrally symmetrically distributed.

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