A device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion

Abstract

The present application relates to pipeline detection technical field, disclose a kind of inner wall flatness detection device after hydrogen conveying pipeline extrusion forming, the present application solves the problem of low efficiency of the inner wall flatness detection device after hydrogen conveying pipeline extrusion forming by a group of scanning detection head around circle detection flatness.The present application includes base plate and detection assembly reciprocating in the two sides of base plate, gear and rack are engaged with the movement of moving block, planetary gear and sun gear are engaged, further make sector rack drive rack two movement, make half gear drive box and laser scanning head swing, each group of laser scanning head can scan the pipe wall of 90 degree range, compared with the mode that traditional only rely on one laser scanning head around roll 360 degree scanning, greatly improve the time efficiency of pipe wall flatness detection, when gear moves to the interval between rack adjacent tooth block, rack two can be homed by tension spring resilience, drive laser scanning head homing, further improve overall detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and in particular to a device for detecting the flatness of the inner wall of a hydrogen transmission pipeline after extrusion molding. Background Art

[0002] With the widespread application of clean energy hydrogen, hydrogen pipelines are becoming increasingly important as key infrastructure. Hydrogen molecules are small, highly permeable, and can cause hydrogen embrittlement under high pressure, which places high demands on pipeline sealing and materials. The flatness of the inner wall affects the efficiency and purity of hydrogen transportation. The uneven inner wall of the hydrogen pipeline will cause uneven hydrogen flow, excessive local flow rate or turbulence, increase pipeline resistance, reduce transportation efficiency, and cause pressure fluctuations, affecting the stability of the entire transportation system. Therefore, a device for detecting the flatness of the inner wall of the hydrogen pipeline after extrusion molding is required.

[0003] The existing device for detecting the flatness of the inner wall of an extruded hydrogen pipeline uses a sliding guide rail to drive a moving component to move, and the moving component drives a group of laser scanning heads fixedly installed on one side of a fixed block to move. In addition, a rotating structure is provided on one side of the fixed block to drive the laser scanning equipment to rotate around multiple times to detect the flatness of the inner wall of the pipeline, which is time-consuming and inefficient.

[0004] In response to the above problems, an innovative design was made based on the original inner wall flatness detection device after extrusion molding of the hydrogen transmission pipeline. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion molding. By using this device, the problem of low efficiency of the existing device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion molding by using a group of scanning detection heads to circle around and detect flatness is solved.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for detecting the flatness of the inner wall of a hydrogen transmission pipeline after extrusion molding, comprising a base plate and a detection assembly that reciprocates on both sides of the base plate, a cylinder being provided at the top of the base plate, a top plate being provided at the output end of the cylinder, the top plate being used to lift the pipeline, a frame plate being symmetrically provided on one side of the base plate, a guide rail being symmetrically provided inside the base plate, the guide rail being used for the reciprocating movement of the frame plate, two groups of frame plates being symmetrically distributed about the central axis of the base plate, a moving assembly being provided on one side of each of the two groups of frame plates, the two groups of moving assemblies moving in opposite directions, and the two groups of moving assemblies being used for the reciprocating movement of the detection assembly;

[0007] The moving assembly includes a screw rod drivingly connected to one side of the frame plate, and the moving assembly also includes a slide plate slidably connected to one side of the bottom plate, and a moving block is provided on the top of the slide plate, and the moving block is threadedly connected to the screw rod;

[0008] The two groups of detection assemblies contain the same components and move in opposite directions. One group of detection assemblies includes a housing disposed on one side of the moving block, the interior of the housing being connected to a box body via an axis, the box bodies being evenly spaced, and a laser scanning head being fixedly mounted on one end of each of the four box bodies.

[0009] One side of the two groups of moving components is respectively provided with a swing structure, and the swing structure is used for the laser scanning head to expand the detection range, and the swing structure includes a rack 1 arranged on one side of the frame plate, and a plurality of groups of gear blocks are evenly spaced on the surface of the rack 1, and each group of gear blocks has 12 groups of teeth, and the swing structure also includes a gear 1 rotatably connected to one side of the shell, and 12 groups of teeth are provided on the outer side of the gear 1, and the gear 1 is meshed with the gear blocks on the rack 1, and a rotating rod is provided on one side of the gear 1, and a bevel gear group is provided on the end of the rotating rod away from the gear 1, and a fan-shaped rack is provided on one side of the bevel gear group, and the swing structure also includes a rack 2 slidably connected to the inside of the shell, and gear blocks are distributed on both sides of the rack 2. One side of each group of box bodies is respectively rotatably connected with a half gear, and the rack 2 is meshed with the half gear and the fan-shaped rack;

[0010] A support structure is provided at one end of the screw rod away from the servo motor. The function of the support structure is that after the two sets of screw rods are inserted into the pipe, the ends of the two sets of screw rods that are close to each other are supported and fixed to the pipe wall through the support structure.

[0011] Furthermore, the support structure includes a circular plate arranged at one end of one group of screw rods, a pushing block is arranged on one side of the circular plate, the pushing block is trapezoidal, and there are four groups of pushing blocks distributed at equal intervals. The support structure also includes a fixed shell arranged at one end of another group of screw rods, and an opening is opened on the surface of the fixed shell, and the opening corresponds one-to-one to the four groups of pushing blocks.

[0012] Furthermore, a sliding groove is provided on the inner wall of the fixed shell, and four groups of sliding grooves are provided at equal intervals. Sliders are slidably connected to the inside of the four groups of sliding grooves. A tension spring is provided on one side of the slider, and the end of the tension spring away from the slider is connected to the sliding groove. A driven block is provided on the other side of the slider, and the driven block is trapezoidal. The inclined surface of the driven block coincides with the pushing block. A block groove is provided on the surface of the fixed shell, and the driven block moves in the block groove. A support block is provided on one side of the driven block, and the support block is arc-shaped.

[0013] Furthermore, an extension plate is fixedly mounted on one side of the frame plate, a servo motor is fixedly mounted on the top of the extension plate, and an output end of the servo motor is connected to the lead screw.

[0014] Furthermore, the housing is threadedly connected to the lead screw, and a surface of the housing is provided with slots, which correspond one-to-one to the four groups of laser scanning heads.

[0015] Furthermore, a support plate is provided between the frame plate and the fixed shell, and the rack 1 is fixedly installed on the support plate.

[0016] Furthermore, a vertical plate is provided on one side of the shell, a rod groove is opened on the surface of the vertical plate, and the rotating rod is rotatably connected to the rod groove. A side block is also provided on one side of the shell, and the rotating rod is rotatably connected to the side block.

[0017] Furthermore, a sun gear is slidably connected to one side of the shell, and a planetary gear is meshedly connected to the outer side of the sun gear. There are four groups of planetary gears, and a driven rod is provided on one side of each of the four groups of planetary gears. The four groups of driven rods are all rotatably connected to the inner wall of the shell.

[0018] Furthermore, the bevel gear set includes a bevel gear 1 arranged on one side of the rotating rod, and the bevel gear set also includes a bevel gear 2 arranged at one end of one set of driven rods, and the bevel gear 1 is meshed with the bevel gear 2.

[0019] Furthermore, a rotating shaft is provided on one side of the box body, a half gear is provided on the outside of the rotating shaft, a connecting plate is provided inside the shell, a telescopic rod is fixedly installed on the top of the connecting plate, a spring is sleeved on the outside of the output end of the telescopic rod, and the output end of the telescopic rod is connected to rack two.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention proposes a device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion molding. The existing device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion molding uses a group of scanning detection heads to detect the flatness in a circle, which is inefficient. The present invention includes a base plate and a detection component that reciprocates on both sides of the base plate. The frame plate drives the moving component to insert the pushing block into the fixed shell to push the driven block. The driven block drives the supporting block to expand outward and contact the inside of the pipeline to form a support and fixation, which can avoid the screw rod from tilting and ensure the stability of the device during pipeline detection operation. Then, as the moving block moves, the gear and The rack is meshed, the bevel gears are meshed with each other, and the planetary gears are meshed with the sun gear, so that the sector rack drives the second rack to move, and the half gear drives the box and the laser scanning head to swing. Each set of laser scanning heads can scan the pipe wall within a 90-degree range. Compared with the traditional method of relying on only one laser scanning head to scan 360 degrees, the time efficiency of pipe wall flatness detection is greatly improved; when the gear moves to the spacing between adjacent tooth blocks of the rack, the second rack can return to its position through the rebound force of the tension spring, driving the laser scanning head to return to its position, and further improving the overall detection efficiency as the components move and rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall three-dimensional cross-sectional structure of the present invention;

[0024] Figure 3 is a schematic diagram of the three-dimensional structure of the mobile component of the present invention;

[0025] Figure 4 Schematic diagram of the three-dimensional structure of the swing structure and detection assembly of the present invention;

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the three-dimensional structure enlarged at point A in the middle;

[0027] Figure 6 Schematic diagram of the three-dimensional unfolding structure of the swing structure and detection assembly of the present invention;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the detection assembly of the present invention after the swing state;

[0029] Figure 8 Schematic diagram of the three-dimensional structure of the support structure of the present invention.

[0030] Figure: 1, bottom plate; 2, frame plate; 3, guide rail; 4, moving assembly; 41, extension plate; 42, servo motor; 43, lead screw; 44, moving block; 45, slide plate; 5, swing structure; 51, support plate; 52, rack 1; 53, gear 1; 54, rotating rod; 55, vertical plate; 56, bevel gear 1; 57, bevel gear 2; 58, driven rod; 59, planetary gear; 510, sun gear; 511, sector rack; 512, connecting plate ; 513, telescopic rod; 514, spring; 515, rack 2; 516, half gear; 517, rotating shaft; 518, side block; 6, detection component; 61, outer shell; 62, box body; 63, laser scanning head; 64, notch; 7, supporting structure; 71, circular plate; 72, pushing block; 73, fixed shell; 74, slide groove; 75, slider; 76, opening; 77, tension spring; 78, driven block; 79, support block; 8, cylinder; 9, top plate. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0033] Combine Figures 1-8A device for detecting the flatness of the inner wall of a hydrogen pipeline after extrusion molding comprises a bottom plate 1 and a detection component 6 that reciprocates on both sides of the bottom plate 1. A cylinder 8 is provided at the top of the bottom plate 1, and a top plate 9 is provided at the output end of the cylinder 8. The top plate 9 is used to lift the pipeline. A frame plate 2 is symmetrically provided on one side of the bottom plate 1, and a guide rail 3 is symmetrically provided inside the bottom plate 1. The guide rail 3 is used for the reciprocating movement of the frame plate 2. There are two groups of frame plates 2 symmetrically distributed about the central axis of the bottom plate 1. A moving component 4 is respectively provided on one side of the two groups of frame plates 2. The two groups of moving components 4 move in opposite directions, and the two groups of moving components 4 are respectively used for the reciprocating movement of the detection component 6.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] See also Figure 1-8 The moving component 4 includes a screw rod 43 that is driven and connected to one side of the frame plate 2. The moving component 4 also includes a slide plate 45 that is slidably connected to one side of the base plate 1. A moving block 44 is provided at the top of the slide plate 45. The moving block 44 is threadedly connected to the screw rod 43. An extension plate 41 is fixedly installed on one side of the frame plate 2. A servo motor 42 is fixedly installed on the top of the extension plate 41. The output end of the servo motor 42 is connected to the screw rod 43 to facilitate the movement of the detection component 6.

[0036] The two detection components 6 include the same components, and the two detection components 6 move in opposite directions. One detection component 6 includes a housing 61 arranged on one side of the moving block 44. The interior of the housing 61 is connected to a box body 62 through an axis rotation. There are four box bodies 62 distributed at equal intervals, and one end of each of the four box bodies 62 is fixedly installed with a laser scanning head 63. The housing 61 is threadedly connected to the screw rod 43. A notch 64 is opened on the surface of the housing 61. The notch 64 corresponds to the four groups of laser scanning heads 63 one by one.

[0037] A swing structure 5 is provided on one side of each of the two groups of moving components 4. The swing structure 5 is used for the laser scanning head 63 to expand the detection range. The swing structure 5 includes a rack 52 provided on one side of the frame 2. A plurality of groups of gear blocks are evenly distributed on the surface of the rack 52. Each group of gear blocks has 12 groups of teeth. The swing structure 5 also includes a gear 53 rotatably connected to one side of the housing 61. The outer side of the gear 53 is provided with 12 groups of teeth. The gear 53 is meshed with the gear blocks on the rack 52. A rotating rod 54 is provided on one side of the gear 53. The rotating rod 54 is away from the gear A bevel gear set is provided at one end of the first gear 53, and a sector rack 511 is provided on one side of the bevel gear set. The swing structure 5 also includes a second rack 515 slidably connected to the inside of the shell 61. Tooth blocks are distributed on both sides of the second rack 515. One side of each box body 62 is rotatably connected to a half gear 516. The second rack 515 is meshed with the half gear 516 and the sector rack 511. A support plate 51 is provided between the frame plate 2 and the fixed shell 73. The first rack 52 is fixedly installed with the support plate 51. A vertical plate 55 is provided on one side of the shell 61. The surface of the vertical plate 55 is A rod groove is provided, and the rotating rod 54 is rotatably connected to the rod groove. A side block 518 is also provided on one side of the housing 61. The rotating rod 54 is rotatably connected to the side block 518. A sun gear 510 is slidably connected to one side of the housing 61. The outer side of the sun gear 510 is meshed with a planetary gear 59. There are four groups of planetary gears 59. One side of the four groups of planetary gears 59 is respectively provided with a driven rod 58. The four groups of driven rods 58 are all rotatably connected to the inner wall of the housing 61. The bevel gear group includes a bevel gear 56 provided on one side of the rotating rod 54. The bevel gear group also includes a bevel gear 56 provided on the Bevel gear 2 57 is located at one end of one set of driven rods 58, and bevel gear 1 56 is meshed with bevel gear 2 57. A rotating shaft 517 is provided on one side of the box body 62, and a half gear 516 is provided on the outside of the rotating shaft 517. A connecting plate 512 is provided inside the outer shell 61, and a telescopic rod 513 is fixedly installed on the top of the connecting plate 512. A spring 514 is sleeved on the outside of the output end of the telescopic rod 513, and the output end of the telescopic rod 513 is connected to rack 2 515, thereby improving the time efficiency of a traditional laser scanning head 63 winding 360 degrees.

[0038] A support structure 7 is provided at one end of the screw rod 43 away from the servo motor 42. The function of the support structure 7 is that after the two groups of screw rods 43 are inserted into the pipe, the ends of the two groups of screw rods 43 that are close to each other are supported and fixed to the pipe wall through the support structure 7. The support structure 7 includes a circular plate 71 provided at one end of one group of screw rods 43. A push block 72 is provided on one side of the circular plate 71. The push block 72 is trapezoidal, and there are four groups of push blocks 72 distributed at equal intervals. The support structure 7 also includes a fixed shell 73 provided at one end of the other group of screw rods 43. An opening 76 is provided on the surface of the fixed shell 73. The opening 76 corresponds one to one with the four groups of push blocks 72. The inner wall of the fixed shell 73 is opened. There is a slide groove 74, and four groups of slide grooves 74 are opened at equal intervals. The inside of the four groups of slide grooves 74 are respectively slidably connected with a slider 75. A tension spring 77 is provided on one side of the slider 75. The end of the tension spring 77 away from the slider 75 is connected to the slide groove 74. A driven block 78 is provided on the other side of the slider 75. The driven block 78 is trapezoidal, and the inclined surface of the driven block 78 coincides with the pushing block 72. A block groove is opened on the surface of the fixed shell 73, and the driven block 78 moves in the block groove. A support block 79 is provided on one side of the driven block 78. The support block 79 is arc-shaped to prevent the screw rod 43 from tilting, thereby ensuring the stability of the entire device when performing relevant detection operations on the pipeline.

[0039] Specifically, when in use, the pipeline is placed on the top plate 9 above the bottom plate 1 through the external hanger, and the top plate 9 is driven to move upward by starting multiple groups of cylinders 8 to lift the pipeline, and then the guide rails 3 are driven to make the frame plates 2 on both sides of the bottom plate 1 move in the opposite direction toward the pipeline, so that the two groups of frame plates 2 drive the moving components 4 to move to both sides of the pipeline, so that the four groups of pushing blocks 72 fixedly installed with the circular plate 71 at one end of one group of screw rods 43 are close to the fixed shell 73, and the fixed shell 73 and the pushing blocks 72 move in opposite directions. The pushing blocks 72 are trapezoidal, and the pushing blocks 72 are inserted into the interior through the openings 76 corresponding to the surface of the fixed shell 73. The inclined surface matches the inclined surface of the driven block 78, so that the push block 72 is inserted into the driven block 78 inside the fixed shell 73 and pushes it outward. Further, the four groups of push blocks 72 correspond to each other one by one and move outward in the block grooves opened on the surface of the fixed shell 73. The driven block 78 drives the slider 75 on one side to slide in the slide groove 74. The slider 75 drives the tension spring 77 to pull and store force, so that the four groups of driven blocks 78 drive the supporting blocks 79 at each end to expand outward and contact the inside of the pipe, thereby forming a supporting and fixing effect, preventing the screw rod 43 from tilting, and ensuring the stability of the entire device when performing relevant inspection operations on the pipe;

[0040] Then start the servo motor 42 fixedly installed on one side of the two sets of shelf plates 2 through the extension plate 41 to drive the screw rod 43 to rotate, the screw rod 43 is threadedly connected to the moving block 44, the moving block 44 drives the slide plate 45 at the bottom end to slide and connect with the bottom plate 1, the moving block 44 drives the shell 61 on one side to move, and the shell 61 drives the rotating rod 54 on one side to move, the rotating rod 54 is rotatably connected with the rod groove opened on the surface of the vertical plate 55, and a gear 53 is provided at one end of the rotating rod 54. Since a rack 52 is fixed between the shelf plate 2 and the fixed shell 73 through the support plate 51, the surface of the rack 52 is There are multiple groups of gear blocks distributed at equal intervals on the surface, each group of gear blocks has 12 groups of teeth, and 12 groups of teeth are set on the outside of gear 1 53. As the moving block 44 moves, the gear blocks on the outside of gear 1 53 are meshed with the gear blocks on rack 1 52, so that gear 1 53 drives the rotating rod 54 to rotate one circle, and the rotating rod 54 drives the bevel gear 1 56 to mesh with the bevel gear 2 57, and the bevel gear 2 57 drives the driven rod 58 on one side to rotate, and the driven rod 58 is connected to the side block 518 in rotation, and the driven rod 58 drives the planetary gear 59 to mesh with the sun gear 510, so that the sun gear 510 and The other three sets of planetary gears 59 mesh and rotate, the sun gear 510 is slidably connected to the housing 61, the driven rod 58 rotates one circle to drive the sector rack 511 to rotate one circle, the sector rack 511 rotates clockwise upward and meshes with the rack 2 515, driving the rack 2 515 to move upward, the rack 2 515 drives the output end of the telescopic rod 513 to expand and the spring 514 to stretch and store force, the telescopic rod 513 is fixed to the inner wall of the housing 61 through the connecting plate 512, the rack 2 515 moves upward and meshes with the half gear 516 to rotate 45 degrees, and the half gear 516 is connected to the rotating shaft 517. The box body 62 is driven to rotate 45 degrees. At the same time, the four groups of box bodies 62 respectively drive the laser scanning head 63 to swing the rod 45 degrees. The box body 62 swings in the slot 64 opened on the surface of the shell 61. Thus, each group of laser scanning heads 63 can scan the pipe wall within a range of 90 degrees, thereby detecting the flatness of the pipe wall. This improves the time efficiency of the traditional method of one laser scanning head 63 winding 360 degrees. Compared with the traditional method of relying on only one laser scanning head 63 to scan 360 degrees, the time efficiency is greatly improved, and the detection of the flatness of the pipe wall can be completed more quickly.

[0041] When gear 1 53 moves to the spacing between adjacent tooth blocks on rack 1 52, rack 2 515 drives the output end of telescopic rod 513 to return to its position through the rebound force of tension spring 77, and telescopic rod 513 drives rack 2 515 to move downward and return to its position, and rack 2 515 drives half gear 516 to reverse and return to its position, so that the rotating shaft 517 drives the laser scanning head 63 on one side of the box body 62 to return to its position, and as the moving block 44 moves, the laser scanning head 63 moves and rotates, thereby improving the overall detection efficiency.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding, comprising a base plate (1) and a detection assembly (6) reciprocating on both sides of the base plate (1), characterized in that: A frame plate (2) is symmetrically provided on one side of the base plate (1), and two groups of the frame plates (2) are symmetrically distributed about the central axis of the base plate (1). A moving assembly (4) is provided on one side of each of the two groups of the frame plates (2). The two groups of the moving assemblies (4) move in opposite directions, and the two groups of the moving assemblies (4) are respectively used for the reciprocating movement of the detection assembly (6); The detection assembly (6) includes a housing (61) arranged on one side of the moving block (44), the interior of the housing (61) is connected to a box body (62) via an axis, and one end of each of the four box bodies (62) is fixedly mounted with a laser scanning head (63); One side of the two groups of moving components (4) is respectively provided with a swing structure (5), the swing structure (5) includes a rack (52) provided on one side of the frame (2), the swing structure (5) also includes a gear (53) rotatably connected to one side of the housing (61), the gear (53) is meshed with the tooth block on the rack (52), a rotating rod (54) is provided on one side of the gear (53), a bevel gear set is provided at one end of the rotating rod (54) away from the gear (53), and a fan-shaped rack (511) is provided on one side of the bevel gear set, the swing structure (5) also includes a rack (515) slidably connected to the inside of the housing (61), tooth blocks are distributed on both sides of the rack (515), and a half gear (516) is rotatably connected to one side of each group of box bodies (62), and the rack (515) is meshed with the half gear (516) and the fan-shaped rack (511); An extension plate (41) is fixedly mounted on one side of the frame plate (2), a servo motor (42) is fixedly mounted on the top of the extension plate (41), a screw rod (43) is provided at the output end of the servo motor (42), and a support structure (7) is provided at one end of the screw rod (43) away from the servo motor (42). The function of the support structure (7) is that after the two sets of screw rods (43) are inserted into the pipe, the ends of the two sets of screw rods (43) that are close to each other are supported and fixed to the pipe wall through the support structure (7).

2. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: The support structure (7) includes a circular plate (71) arranged at one end of one group of screw rods (43), a push block (72) is arranged on one side of the circular plate (71), the push block (72) is trapezoidal, and four groups of push blocks (72) are evenly spaced. The support structure (7) also includes a fixed shell (73) arranged at one end of the other group of screw rods (43), and an opening (76) is opened on the surface of the fixed shell (73), and the opening (76) corresponds to the four groups of push blocks (72) one by one.

3. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 2, characterized in that: The inner wall of the fixed shell (73) is provided with a slide groove (74), and four groups of slide grooves (74) are provided at equal intervals. The insides of the four groups of slide grooves (74) are respectively slidably connected with sliders (75). A tension spring (77) is provided on one side of the slider (75), and the end of the tension spring (77) away from the slider (75) is connected to the slide groove (74). A driven block (78) is provided on the other side of the slider (75). The driven block (78) is trapezoidal, and the inclined surface of the driven block (78) coincides with the pushing block (72). A block groove is provided on the surface of the fixed shell (73), and the driven block (78) moves in the block groove. A support block (79) is provided on one side of the driven block (78), and the support block (79) is arc-shaped.

4. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: A cylinder (8) is provided at the top of the base plate (1), and a top plate (9) is provided at the output end of the cylinder (8). The top plate (9) is used to lift the pipeline. A frame plate (2) is symmetrically provided on one side of the base plate (1). A guide rail (3) is symmetrically provided inside the base plate (1). The guide rail (3) is used for the reciprocating movement of the frame plate (2). The moving assembly (4) includes a screw rod (43) connected to one side of the frame plate (2) for driving. The moving assembly (4) also includes a slide plate (45) connected to one side of the base plate (1) for sliding. A moving block (44) is provided at the top of the slide plate (45). The moving block (44) is threadedly connected to the screw rod (43).

5. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: The housing (61) is threadedly connected to the screw rod (43), and a notch (64) is provided on the surface of the housing (61). The notch (64) corresponds one-to-one to the four groups of laser scanning heads (63).

6. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: A support plate (51) is provided between the frame plate (2) and the fixed shell (73), and rack 1 (52) is fixedly mounted on the support plate (51).

7. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: A vertical plate (55) is provided on one side of the housing (61), a rod groove is provided on the surface of the vertical plate (55), and the rotating rod (54) is rotatably connected to the rod groove. A side block (518) is also provided on one side of the housing (61), and the rotating rod (54) is rotatably connected to the side block (518).

8. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 7, characterized in that: A sun gear (510) is slidably connected to one side of the housing (61), and a planetary gear (59) is meshedly connected to the outer side of the sun gear (510). The planetary gears (59) are distributed in four groups, and a driven rod (58) is respectively provided on one side of the four groups of planetary gears (59). The four groups of driven rods (58) are all rotatably connected to the inner wall of the housing (61).

9. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 1, characterized in that: The bevel gear set includes a bevel gear 1 (56) arranged on one side of the rotating rod (54), and the bevel gear set also includes a bevel gear 2 (57) arranged at one end of one set of driven rods (58), and the bevel gear 1 (56) is meshed with the bevel gear 2 (57).

10. The device for detecting the smoothness of the inner wall of a hydrogen pipeline after extrusion molding according to claim 7, characterized in that: A rotating shaft (517) is provided on one side of each group of the box bodies (62), a half gear (516) is provided on the outside of the rotating shaft (517), a connecting plate (512) is provided inside the housing (61), a telescopic rod (513) is fixedly installed on the top of the connecting plate (512), a spring (514) is sleeved on the outside of the output end of the telescopic rod (513), and the output end of the telescopic rod (513) is connected to the second rack (515).

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