Flaw detection device for manufacturing high-pressure hydrogen pipe fitting

Abstract

The invention discloses a flaw detection device for manufacturing a high-pressure hydrogen pipe fitting, and belongs to the field of pipeline detection. Comprising a mounting mechanism, and a moving mechanism is arranged on the inner side of the mounting mechanism; a detection mechanism is arranged above the moving mechanism; the detection mechanism comprises a fixed seat, movable seats are arranged on the two sides of the fixed seat, and T-shaped sliding grooves are formed in the right side of the fixed seat and the right sides of the movable seats; according to the invention, a mode of'pipe fitting fixation + detection probe circular scanning 'is adopted to replace a detection scheme of'pipe fitting rotation' in the prior art, the problem of radial run-out caused by rotation of the pipe fitting is thoroughly avoided, and the guide fit of the T-shaped sliding groove and the T-shaped sliding strip is matched, so that the stable movement of the detection probe along the outer surface of the pipe fitting and the constant distance between the detection probe and the surface of the pipe fitting are ensured; and the accuracy of defect detection is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection, and more particularly to a flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings. Background Technology

[0002] High-pressure hydrogen-contaminated pipe fittings are core pressure-bearing components in petrochemical, coal chemical, and hydrogen energy storage and transportation fields. They are used in harsh environments with high temperature, high pressure and hydrogen corrosion for a long time. Even small defects on their surface (such as cracks, pores, inclusions, etc.) can expand rapidly under the action of hydrogen embrittlement and pressure cycling, eventually causing major safety accidents such as leaks and explosions. Therefore, high-precision flaw detection must be used to achieve comprehensive defect detection during the manufacturing process.

[0003] With the rapid development of the hydrogen energy industry and the large-scale upgrading of refining and chemical plants, the specifications of high-pressure hydrogen-contaminated pipe fittings are expanding in multiple dimensions, which places more stringent requirements on the accuracy, stability, and adaptability of flaw detection. The existing technology adopts the detection method of "clamping disc driving pipe fitting rotation + horizontal movement of detection probe". The high-speed rotation of the pipe fitting is prone to radial runout, which causes fluctuations in the distance between the detection probe and the pipe fitting surface, greatly reducing the accuracy of defect detection. Moreover, there is a safety risk of loosening and displacement during the rotation of the pipe fitting. The scheme of using a motor / electric actuator to drive the axial movement of the detection component separately requires multiple independent drive components and a collaborative control system. The control logic is complex and prone to feed accuracy errors, resulting in missed or repeated scans. The traditional spacing adjustment structure has poor adaptability and it is difficult to achieve efficient segmented detection of pipe fittings of different lengths while ensuring transmission synchronization.

[0004] The flaw detection device for circular steel components involved in patent CN109917004B can only detect and mark the weld position. The movement mode and drive structure of its detection probe cannot be adapted to the stringent detection requirements of high-pressure hydrogen-containing pipe fittings. In addition, it has problems such as discontinuous detection and poor adaptability, making it difficult to meet the actual needs of the hydrogen energy industry and the upgrading of refining and chemical plants for flaw detection of high-pressure hydrogen-containing pipe fittings.

[0005] To address this, the present invention designs a flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings. By optimizing the transmission structure and motion mode, it achieves a balance between transmission efficiency and economic efficiency while ensuring detection accuracy and improving automation level, thus solving the problems of low detection accuracy, complex control, and poor adaptability in the prior art. Summary of the Invention

[0006] Purpose of the Invention: The purpose of this invention is to provide a flaw detection device for manufacturing high-pressure hydrogen-bearing pipe fittings, solving the problems of easy jumping during pipe fitting rotation detection, complex collaborative control of independent drive components, and difficulty in balancing transmission efficiency and detection accuracy in existing technologies. By constructing a linkage mechanical transmission mechanism of "circumferential scanning of the detection probe - automatic axial feeding of the detection component," it replaces the traditional "pipe fitting rotation" or "multi-motor independent drive" scheme, achieving jump-free, high-precision, and continuous scanning of the detection probe along the pipe fitting surface, while reducing the number of independent drive components and simplifying the control logic. Another purpose of this invention is to provide a highly synchronous and easy-to-operate spacing adjustment structure to adapt to the detection needs of high-pressure hydrogen-bearing pipe fittings of different lengths. While ensuring transmission synchronization, it enables flexible adjustment of the spacing of the detection mechanism, improving detection efficiency. Simultaneously, it optimizes component selection and assembly methods, reducing production, installation, and maintenance costs, and meeting the needs of practical industrial applications.

[0007] Technical solution: A flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings, including an installation mechanism, wherein a moving mechanism is provided on the inner side of the installation mechanism; A detection mechanism is provided above the moving mechanism; The detection mechanism includes a fixed base, and movable seats are provided on both sides of the fixed base. A T-shaped slide groove is provided on the right side of the fixed base and the right side of the movable seat. A T-shaped slide bar is slidably connected inside the T-shaped slide groove. An arc rack is fixedly connected to the outer wall of the T-shaped slide bar. A mounting plate is fixedly connected to the right side of the T-shaped slide bar. A detection probe is fixedly connected to the upper surface of the mounting plate. The front and rear interior of the fixed seat are rotatably connected to the front and rear interior of the movable seat via a rotating shaft. A spur gear is fixedly connected to the right end of the spur gear, and the outer side wall of the spur gear meshes with the outer side wall of the arc rack. A transmission wheel is fixedly connected to the left end of the spur gear, and the outer side walls of the two opposing transmission wheels are connected to a transmission belt. The mating surfaces of the T-shaped groove and the T-shaped slide bar are both polished, and the mating gap is 0.02-0.05mm.

[0008] Furthermore, the two opposing spur gears and the transmission wheel are fixedly connected by a telescopic link.

[0009] Furthermore, an L-shaped bracket is fixedly connected to the left rear of the movable seat located to the left of the fixed seat. A motor is fixedly connected to the inner side of the L-shaped bracket, and the left end of the output shaft of the motor is fixedly connected to the left side of the central shaft of the transmission wheel located to the left rear of the left side of the movable seat.

[0010] Furthermore, a paving tooth is fixedly connected to the lower surface of the mounting plate located on the right side of the fixing base.

[0011] Furthermore, two bearing seats are fixedly connected to the rear surface of the fixed seat, and a screw is rotatably connected between the two bearing seats via a rotating shaft. A threaded sleeve is rotatably connected to the outer wall of the screw via a rotating shaft. A traction rod is rotatably connected to both sides of the threaded sleeve via a rotating shaft. The end of the traction rod away from the threaded sleeve is rotatably connected to the rear surface of the movable seat via a rotating shaft.

[0012] Furthermore, the moving mechanism includes a moving plate, the center of the upper surface of which is fixedly connected to the lower surface of the fixed base. A through-type linkage port is provided on the upper surface of the moving plate and to the right of the fixed base. A second spur gear is rotatably connected to the left side of the linkage port via a rotating shaft. The outer wall of the second spur gear meshes with the outer wall of the actuating tooth. A first bevel gear is fixedly connected to the right side of the second spur gear. A second bevel gear meshes with the outer wall of the first bevel gear. A cylinder is fixedly connected to the lower surface of the second bevel gear. An L-shaped bracket is rotatably connected to the outer wall of the cylinder via a rotating shaft. The top of the second L-shaped bracket is fixedly connected to the upper surface of the moving plate. A third spur gear is fixedly connected to the bottom end of the cylinder.

[0013] Furthermore, the upper surface of the movable plate is provided with transverse grooves on both sides, a crossbar is fixedly connected to the inner side of the transverse groove, a slider is slidably connected to the outer side wall of the crossbar, and the top of the slider is fixedly connected to the top of the movable seat.

[0014] Furthermore, the mounting mechanism includes a U-shaped seat, with two guide rods fixedly connected to the inner side of the U-shaped seat, and two guide blocks slidably connected to the outer side walls of the guide rods. The upper surface of the guide blocks is fixedly connected to the lower surface of the moving plate, and a toothed rod is fixedly connected to the inner lower surface of the U-shaped seat. The front surface of the toothed rod meshes with the rear of the outer side wall of the third spur gear.

[0015] Furthermore, electric push rods are fixedly connected to both sides of the U-shaped seat, and the output ends of the two electric push rods extend through the inner side of the U-shaped seat and are fixedly connected to clamping plates.

[0016] Beneficial effects: This invention adopts the method of "fixing the pipe fitting + circumferential scanning of the detection probe" to replace the detection scheme of "pipe fitting rotation" in the prior art, which completely avoids the radial runout problem caused by pipe fitting rotation. With the guidance of T-shaped slide groove and T-shaped slide bar, it ensures that the detection probe moves smoothly along the outer surface of the pipe fitting and the distance between the detection probe and the surface of the pipe fitting remains constant, which greatly improves the accuracy of defect detection. The transmission belt and transmission wheel work together to ensure the uniformity of the circumferential scanning of the detection probe, avoid the detection omissions caused by transmission slippage, and further improve the continuity of detection. The constructed "circumferential scanning of the detection ring - automatic axial feeding of the detection component" linkage mechanical transmission mechanism relies on the structure of motor, transmission wheel, transmission belt and other structures to drive the detection probe to complete the circumferential scanning of the pipe fitting. After that, the automatic axial feeding of the moving plate is realized through the meshing transmission of the gear, the second spur gear, the bevel gear set, the third spur gear and the rack. Only one set of motors is needed to realize the circumferential scanning of the detection probe and the axial feeding of the detection component at the same time. Compared with the existing technology of "motor + electric push rod" multi-independent drive scheme, it reduces the number of drive components, simplifies the logic design of the control system, and reduces the error of multi-component collaborative control. At the same time, the meshing components are all wear-resistant and quenched to improve transmission efficiency and service life, solve the problem of low efficiency of traditional meshing transmission, and are suitable for the fine technology field of flaw detection. The electric push rod in the installation mechanism drives the clamping plate to firmly clamp the pipe fitting. With the guidance of the guide rod and guide block, displacement of the pipe fitting and the detection components can be effectively avoided during the inspection process. The detection mechanism ensures that the detection probe moves smoothly along the outer surface of the pipe fitting through the sliding cooperation of the T-shaped slide bar and the T-shaped slide groove, thereby improving the accuracy of defect detection. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the installation mechanism of the present invention; Figure 3 This is a schematic diagram of the moving mechanism of the present invention; Figure 4 This is a bottom view of the moving mechanism of the present invention. Figure 5 This is a schematic diagram of the detection structure of the present invention; Figure 6 This is a rear view schematic diagram of the detection structure of the present invention; Figure 7 This is a side view of the fixing base of the present invention; Figure 8 This is a side view schematic diagram of the connection structure between the mounting plate and the actuating teeth of the present invention.

[0018] In the diagram: 1. Installation mechanism; 2. Moving mechanism; 3. Detection mechanism; 101. U-shaped seat; 102. Guide rod; 103. Guide block; 104. Gear rack; 105. Electric push rod; 106. Clamping plate; 201. Moving plate; 202. Linkage port; 203. Circular gear two; 204. Bevel gear one; 205. Bevel gear two; 206. Cylinder; 207. L-shaped bracket two; 208. Circular gear three; 209. Horizontal groove; 210. Crossbar; 211. 301. Slider; 302. Fixed seat; 303. Movable seat; 304. T-shaped slide rail; 305. T-shaped slide bar; 306. Circular arc rack; 307. Mounting plate; 308. Detection probe; 309. Shaft column; 310. Circular gear one; 311. Transmission wheel; 312. Transmission belt; 313. Telescopic connecting rod; 314. L-shaped bracket one; 315. Motor; 316. Actuating gear; 317. Shaft seat; 318. Screw; 319. Screw sleeve; 310. Traction rod. Detailed Implementation

[0019] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example like Figure 1 and Figure 2 As shown, a flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings is provided, including an installation mechanism 1; The mounting mechanism 1 includes a U-shaped seat 101. Two guide rods 102 are fixedly connected to the inner side of the U-shaped seat 101. Two guide blocks 103 are slidably connected to the outer side wall of the guide rods 102. The upper surface of the guide blocks 103 is fixedly connected to the lower surface of the moving plate 201. A gear 104 is fixedly connected to the inner lower surface of the U-shaped seat 101. The front surface of the gear 104 meshes with the rear of the outer side wall of the spur gear 208.

[0021] Electric push rods 105 are fixedly connected to both sides of the U-shaped base 101. The output ends of the two electric push rods 105 pass through the inner side of the U-shaped base 101 and are fixedly connected to the clamping plate 106. First, the high-pressure hydrogen-containing pipe to be tested is hoisted to the inside of the U-shaped seat 101, ensuring that the pipe axis is aligned with the central axis of the clamping plate 106. Then, the electric push rods 105 on both sides of the U-shaped seat 101 are activated. The output ends of the electric push rods 105 push the clamping plate 106 towards the pipe until the two clamping plates 106 are tightly abutted against the two end faces of the pipe, achieving axial positioning and stable clamping of the pipe to prevent displacement during the testing process. After clamping is completed, the sliding state of the guide block 103 on the guide rod 102 is checked to ensure that the moving plate 201 can drive the subsequent testing mechanism to move smoothly along the guide rod 102.

[0022] like Figure 3 and Figure 4 As shown, a moving mechanism 2 is provided on the inner side of the mounting mechanism 1; The moving mechanism 2 includes a moving plate 201. The center of the upper surface of the moving plate 201 is fixedly connected to the lower surface of the fixed base 301. A through-type linkage port 202 is opened on the upper surface of the moving plate 201 and to the right of the fixed base 301. A second spur gear 203 is rotatably connected to the left side of the inner side of the linkage port 202 via a rotating shaft. The outer side wall of the second spur gear 203 meshes with the outer side wall of the actuating tooth 315. A first bevel gear 204 is fixedly connected to the right side of the second spur gear 203. A second bevel gear 205 is meshed with the outer side wall of the first bevel gear 204. A cylinder 206 is fixedly connected to the lower surface of the second bevel gear 205. An L-shaped bracket 207 is rotatably connected to the outer side wall of the cylinder 206 via a rotating shaft. The top of the second L-shaped bracket 207 is fixedly connected to the upper surface of the moving plate 201. A third spur gear 208 is fixedly connected to the bottom end of the cylinder 206.

[0023] The upper surface of the movable plate 201 is provided with transverse grooves 209 on both sides. A crossbar 210 is fixedly connected to the inner side of the transverse groove 209. A slider 211 is slidably connected to the outer side wall of the crossbar 210. The top of the slider 211 is fixedly connected to the top of the movable seat 302. The use of the moving mechanism 2 is linked to the circumferential scanning action of the detection mechanism 3. After the detection probe 307 in the detection mechanism 3 completes a uniform scan of the pipe fitting, the arc-shaped actuating tooth 315 below the mounting plate 306 rotates as the arc-shaped rack 305 resets. The actuating tooth 315 drives the second round gear 203 in the linkage port 202 to rotate. The second round gear 203 drives the meshing bevel gear 205 to rotate synchronously through the first round gear 204. The second round gear 205 drives the cylinder 206 and the third round gear 208 at the bottom to rotate synchronously. Because the third round gear 208 and the U-shaped seat The gear 104 on 101 meshes, and the rotation of the spur gear 208 is converted into the precise axial feed of the moving plate 201 along the guide rod 102. The moving plate 201 slides smoothly on the guide rod 102 through the guide block 103 and the linear bearing. At the same time, the movable seat 302 keeps stable following in the transverse groove 209 of the crossbar 210 through the slider 211 and the self-lubricating pad. This realizes the automatic and high-precision axial feed of the detection mechanism 3. The movement detection of the next detection section can be completed without the need for additional control of the pipe fittings. The feed accuracy is guaranteed by the meshing accuracy of the gear and the spur gear 208, and there is no feed error.

[0024] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a detection mechanism 3 is provided above the moving mechanism 2; The detection mechanism 3 includes a fixed base 301, with movable bases 302 on both sides of the fixed base 301. T-shaped grooves 303 are provided on the right side of both the fixed base 301 and the right side of the movable base 302. A T-shaped slide bar 304 is slidably connected inside the T-shaped groove 303. A circular arc rack 305 is fixedly connected to the outer wall of the T-shaped slide bar 304. A mounting plate 306 is fixedly connected to the right side of the T-shaped slide bar 304. A detection probe 307 is fixedly connected to the upper surface of the mounting plate 306. A shaft column 308 is rotatably connected to the front and rear interior of the fixed base 301 and the front and rear interior of the movable base 302 via a rotating shaft. A spur gear 309 is fixedly connected to the right end of the shaft column 308. The outer wall of the spur gear 309 meshes with the outer wall of the circular arc rack 305. A transmission wheel 310 is fixedly connected to the left end of the shaft column 308. A transmission belt 311 is connected to the outer walls of the two opposing transmission wheels 310. A telescopic connecting rod 312 is fixedly connected between the left and right opposing spherical gears 309 and the transmission wheel 310; An L-shaped bracket 313 is fixedly connected to the left rear of the movable seat 302 located to the left of the fixed seat 301. A motor 314 is fixedly connected to the inner side of the L-shaped bracket 313. The left end of the output shaft of the motor 314 is fixedly connected to the left side of the central shaft of the transmission wheel 310 located to the left rear of the left side of the movable seat 302. A toggle tooth 315 is fixedly connected to the lower surface of the mounting plate 306 located on the right side of the fixing base 301; Two bearing seats 316 are fixedly connected to the rear surface of the fixed seat 301. A screw 317 is rotatably connected between the two bearing seats 316 via a rotating shaft. A threaded sleeve 318 is rotatably connected to the outer wall of the screw 317 via a rotating shaft. A traction rod 319 is rotatably connected to both sides of the threaded sleeve 318 via a rotating shaft. The end of the traction rod 319 away from the threaded sleeve 318 is rotatably connected to the rear surface of the movable seat 302 via a rotating shaft. The mating surfaces of the T-shaped groove 303 and the T-shaped slide bar 304 are both polished, and the mating clearance is 0.02-0.05mm; Depending on the length of the pipe fitting to be tested, rotate the handwheel at the end of the precision screw 317 between the rear surface bearing 316 of the fixed seat 301. The precision screw 317 drives the threaded sleeve 318 to move along its axial direction. The threaded sleeve 318 pulls or pushes the movable seat 302 through the traction rods 319 on both sides. The movable seat 302 slides smoothly on the crossbar 210 of the moving plate 201 through the slider 211, realizing precise fine adjustment of the distance between the fixed seat 301 and the movable seats 302 on both sides. At the same time, the telescopic connecting rod 312 adapts to the change of distance, ensuring synchronous transmission of the left and right opposite spherical gears 309 and the transmission wheel 310 without transmission gap, adapting to the testing requirements of high-pressure hydrogen-containing pipe fittings of different lengths. The motor 314 on the L-shaped bracket 313 is started. The motor 314 rotates through the transmission wheel 310. The transmission wheel 310 drives the corresponding front and rear shafts 308 to rotate synchronously and at a constant speed through the transmission belt 311. The shafts 308 drive the spur gear 309 to rotate. The spur gear 309 drives the T-shaped slide bar 304 to make a smooth circumferential motion along the T-shaped slide groove 303 through meshing with the arc rack 305. This, in turn, drives the detection probe 307 to perform a uniform and non-jumping circumferential scan around the outer surface of the pipe, thereby achieving high-precision defect detection.

[0025] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings, comprising an installation mechanism (1), characterized in that: The inner side of the installation mechanism (1) is provided with a moving mechanism (2); A detection mechanism (3) is provided above the moving mechanism (2); The detection mechanism (3) includes a fixed base (301), and movable bases (302) are provided on both sides of the fixed base (301). T-shaped grooves (303) are provided on the right side of the fixed base (301) and the right side of the movable base (302). A T-shaped slide bar (304) is slidably connected inside the T-shaped groove (303). A circular arc rack (305) is fixedly connected to the outer wall of the T-shaped slide bar (304). A mounting plate (306) is fixedly connected to the right side of the T-shaped slide bar (304). A detection probe (307) is fixedly connected to the upper surface of the mounting plate (306). The front and rear interior of the fixed seat (301) and the front and rear interior of the movable seat (302) are rotatably connected by a shaft (308). A spur gear (309) is fixedly connected to the right end of the shaft (308). The outer side of the spur gear (309) meshes with the outer side of the arc rack (305). A transmission wheel (310) is fixedly connected to the left end of the shaft (308). The outer sides of the two opposing transmission wheels (310) are connected to a transmission belt (311). The mating surfaces of the T-shaped groove (303) and the T-shaped slide bar (304) are both polished, and the mating gap is 0.02-0.05mm.

2. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 1, characterized in that: The left and right opposite spherical gears (309) and the transmission wheel (310) are fixedly connected by a telescopic link (312); the telescopic link (312) is a spline telescopic link, and the mating surface of its telescopic end and fixed end is treated with a wear-resistant coating.

3. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 1, characterized in that: An L-shaped bracket (313) is fixedly connected to the left rear of the movable seat (302) located to the left of the fixed seat (301). A motor (314) is fixedly connected to the inner side of the L-shaped bracket (313). The left end of the output shaft of the motor (314) is fixedly connected to the left side of the central shaft of the transmission wheel (310) located to the left rear of the left side of the movable seat (302).

4. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 1, characterized in that: A toggle tooth (315) is fixedly connected to the lower surface of the mounting plate (306) located on the right side of the fixing base (301).

5. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 1, characterized in that: Two bearing seats (316) are fixedly connected to the rear surface of the fixed seat (301). A screw (317) is rotatably connected between the two bearing seats (316) via a rotating shaft. A threaded sleeve (318) is rotatably connected to the outer wall of the screw (317) via a rotating shaft. A traction rod (319) is rotatably connected to both sides of the threaded sleeve (318) via a rotating shaft. The end of the traction rod (319) away from the threaded sleeve (318) is rotatably connected to the rear surface of the movable seat (302) via a rotating shaft.

6. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 4, characterized in that: The moving mechanism (2) includes a moving plate (201). The center of the upper surface of the moving plate (201) is fixedly connected to the lower surface of the fixed base (301). A through-type linkage port (202) is provided on the upper surface of the moving plate (201) and to the right of the fixed base (301). A second circular gear (203) is rotatably connected to the left side of the inner side of the linkage port (202) via a rotating shaft. The outer side wall of the second circular gear (203) meshes with the outer side wall of the actuating tooth (315). A bevel gear 1 (204) is fixedly connected to the right side of the second (203). A bevel gear 2 (205) is meshed with the outer side wall of the bevel gear 1 (204). A cylinder (206) is fixedly connected to the lower surface of the bevel gear 2 (205). An L-shaped bracket 2 (207) is rotatably connected to the outer side wall of the cylinder (206) via a rotating shaft. The top of the L-shaped bracket 2 (207) is fixedly connected to the upper surface of the moving plate (201). A spur gear 3 (208) is fixedly connected to the bottom end of the cylinder (206).

7. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 6, characterized in that: The upper surface of the movable plate (201) is provided with transverse grooves (209) on both sides. A crossbar (210) is fixedly connected to the inner side of the transverse groove (209). A slider (211) is slidably connected to the outer side wall of the crossbar (210). The top of the slider (211) is fixedly connected to the top of the movable seat (302).

8. The flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 6, characterized in that: The installation mechanism (1) includes a U-shaped seat (101), with two guide rods (102) fixedly connected to the inner side of the U-shaped seat (101), and two guide blocks (103) slidably connected to the outer side wall of the guide rods (102). The upper surface of the guide blocks (103) is fixedly connected to the lower surface of the moving plate (201), and a rack (104) is fixedly connected to the inner lower surface of the U-shaped seat (101). The front surface of the rack (104) meshes with the rear of the outer side wall of the spur gear (208).

9. A flaw detection device for manufacturing high-pressure hydrogen-containing pipe fittings according to claim 8, characterized in that: Electric push rods (105) are fixedly connected to both sides of the U-shaped seat (101). The output ends of the two electric push rods (105) pass through the inner side of the U-shaped seat (101) and are fixedly connected to a clamping plate (106).

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