Welding seam grinding mechanism of hydrogen conveying pipeline

Abstract

The invention discloses a welding seam grinding mechanism of a hydrogen conveying pipeline, and relates to the technical field of hydrogen conveying pipeline manufacturing, a first vertical movement assembly is arranged on one side of a supporting frame, a first grinding assembly is fixedly mounted on the first vertical movement assembly, and the first vertical movement assembly drives the first grinding assembly to move in the vertical direction; a second vertical movement assembly is arranged on the other side of the supporting frame, a second grinding assembly is fixedly installed on the second vertical movement assembly, the second vertical movement assembly drives the second grinding assembly to move in the vertical direction, and a second horizontal movement assembly and a first horizontal movement assembly are arranged on the supporting frame. According to the welding seam position of the hydrogen conveying pipeline, the positions of the first grinding assembly and the second grinding assembly in the horizontal direction and the vertical direction are adjusted, the abrasive belt is used for grinding the welding seam of the hydrogen conveying pipeline, the grinding assemblies can be conveniently adjusted in the horizontal position and the vertical position, and the device has the advantages that high-quality grinding is achieved, and it is ensured that the surface of the welding seam is smooth.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen transmission pipeline manufacturing, in particular to a weld grinding mechanism for a hydrogen transmission pipeline. Background Art

[0002] The hydrogen pipeline is a straight seam welded pipe with a diameter of 406 to 1420 cm. The weld of the hydrogen pipeline is generally 2 to 3 cm wide and 3.5 cm high. According to the use requirements of the pipeline, the weld of the hydrogen pipeline needs to be ground so that the height of the weld is 0.5 cm higher than the height of the parent material.

[0003] As an important connection part of the hydrogen pipeline, the weld directly affects the overall performance of the pipeline. The weld excess height is equivalent to a local shape mutation, which causes stress concentration and increases the risk of fatigue or brittle fracture. If anti-corrosion materials such as 3PE / epoxy resin glass cloth are used for anti-corrosion treatment, the large external weld excess height will make it difficult to press the weld toe firmly, affecting the anti-corrosion effect. At the same time, if there are defects or unevenness in the weld, it is very easy to cause safety problems such as leakage, which seriously threatens the safety of the pipeline system and the safety of the surrounding environment and personnel. Therefore, high-quality grinding of the hydrogen pipeline welds to ensure that the weld surface is flat and smooth and eliminate potential defects is a key link in ensuring the safe and efficient operation of the hydrogen pipeline.

[0004] The traditional weld grinding method uses manual grinding with a grinding wheel, which has the following disadvantages: First, the efficiency of manual grinding is extremely low, the labor intensity is extremely high, and it is difficult to meet the high-efficiency requirements of weld grinding in large-scale hydrogen pipeline construction and maintenance. Second, the quality of manual grinding is significantly affected by the technical level and working status of the operator. The quality of the weld after grinding is uneven and the stability is poor. It is difficult to meet high quality requirements and cannot effectively ensure the safe operation of the hydrogen pipeline. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a weld grinding mechanism for a hydrogen pipeline that is easy to adjust the grinding assembly in the horizontal and vertical positions, performs high-quality grinding, and ensures a smooth weld surface.

[0006] The technical solution adopted to solve the above technical problems is: a support frame is arranged on the mobile arm, a first vertical motion component is arranged on one side of the support frame, a first grinding component for grinding the weld of the hydrogen pipeline is fixedly installed on the first vertical motion component, the first vertical motion component drives the first grinding component to move in the vertical direction, a second vertical motion component is arranged on the other side of the support frame, a second grinding component for grinding the weld of the hydrogen pipeline is fixedly installed on the second vertical motion component, the second vertical motion component drives the second grinding component to move in the vertical direction, and a component driving the first vertical motion component and the second vertical motion component to move in the horizontal direction is arranged on the support frame A sliding second horizontal motion component and a first horizontal motion component; the structure of the first grinding component is the same as that of the second grinding component, and the first grinding component is: a fixed frame is fixedly installed on the first vertical motion component, a second bracket is arranged on the top of the fixed frame, a first motor is arranged on the second bracket, the output shaft of the first motor is fixedly connected to the transmission wheel, an eccentric shaft is rotatably installed on the fixed frame, a tensioning wheel is eccentrically arranged on the eccentric shaft, the tensioning wheel is located on one side below the transmission wheel, a central shaft is rotatably installed on the fixed frame, a grinding wheel is arranged on the central shaft, the grinding wheel is located below the transmission wheel, and the transmission wheel, the tensioning wheel and the grinding wheel are connected through abrasive belt transmission.

[0007] Furthermore, a first shaft bearing is arranged between the outer circumference of the eccentric shaft and the inner circumference of the tensioning wheel.

[0008] Furthermore, a second bearing is provided between the outer circumference of the central shaft and the inner circumference of the grinding wheel.

[0009] Furthermore, a cylinder is provided on the fixing frame, and a piston rod of the cylinder is connected to the eccentric shaft through a connecting ring.

[0010] Furthermore, the first horizontal motion component is: a first fixed plate and a second fixed plate are provided on the support frame, two first guide rods are provided between the first fixed plate and the second fixed plate, a first screw rod located between the two first guide rods is rotatably installed between the first fixed plate and the second fixed plate, a second motor that drives the first screw rod to rotate is provided on the second fixed plate, the first screw rod is threadedly connected to the first nut seat, sliding rods are respectively provided on both sides of the first nut seat, and first horizontal sliding holes are respectively processed on both sides of the support frame with sliding rods slidingly connected along the horizontal direction, wherein one end of the sliding rod on one side is fixedly connected to the first vertical motion component, and the other end of the sliding rod on the other side is fixedly connected to the second vertical motion component.

[0011] Furthermore, the second horizontal motion component is: a third fixed plate and a fourth fixed plate are provided on the support frame, two second guide rods are provided between the third fixed plate and the fourth fixed plate, a second screw rod located between the two second guide rods is rotatably installed between the third fixed plate and the fourth fixed plate, a third motor that drives the second screw rod to rotate is provided on the fourth fixed plate, the second screw rod is threadedly connected to the second nut seat, second sliders are respectively provided on both sides of the second nut seat, second horizontal sliding holes that are slidably connected to the second slider in the horizontal direction are respectively processed on both sides of the support frame, one end of the second slider on one side is slidably connected to the first vertical motion component in the vertical direction, and one end of the second slider on the other side is slidably connected to the second vertical motion component in the vertical direction.

[0012] Furthermore, the structure of the first vertical motion component is the same as that of the second vertical motion component, and the first vertical motion component is: a horizontal sliding plate is arranged on one side of the support frame, the horizontal sliding plate is processed with a vertical sliding hole which is slidably connected to the second sliding block along the vertical direction, the horizontal sliding plate is processed with an axial hole which is clamped to the sliding rod, vertical guide rails are arranged on both sides of the horizontal sliding plate, each vertical guide rail is connected with the first sliding block which slides along the vertical direction, the first sliding block is fixedly connected to the vertical sliding plate, a first bracket is arranged on the horizontal sliding plate, a screw lift is arranged on the first bracket, the output end of the screw lift is fixedly connected to the vertical sliding plate, and the vertical sliding plate is fixedly connected to the first grinding component.

[0013] The beneficial effects of the present invention are as follows: (1) The present invention adjusts the positions of the first grinding assembly and the second grinding assembly in the horizontal and vertical directions according to the weld position of the hydrogen pipeline. The sanding belt is used to grind the weld of the hydrogen pipeline, which facilitates the adjustment of the grinding assembly in the horizontal and vertical positions. The present invention has the advantages of high-quality grinding and ensuring a smooth weld surface.

[0014] The invention adopts the output end of the cylinder to drive the eccentric shaft to move through the connecting ring, and the eccentric shaft drives the tensioning wheel to move, so that the abrasive belt can be tensioned.

[0015] In the present invention, the weld excess height is ground to make the weld and the surface of the base material transition smoothly, reduce stress concentration, and thus improve the hydrogen fatigue and hydrogen embrittlement resistance of the pipeline.

[0016] In the present invention, the excess height of the weld is removed and ground to be 0.5 mm higher than the parent material, which can eliminate the source of local stress and eliminate welding defects on the weld surface, thereby improving the strength of the weld joint.

[0017] The grinding of the weld excess height in the present invention can ensure that the anti-corrosion layer can evenly and tightly cover the weld surface, thereby improving the anti-corrosion performance of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of an embodiment of a weld grinding mechanism for a hydrogen pipeline of the present invention.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure from another angle.

[0020] Figure 3 It is a structural schematic diagram of a first vertical motion assembly, a second vertical motion assembly, a first grinding assembly, a first horizontal motion assembly and a second grinding assembly.

[0021] Figure 4 yes Figure 3 The schematic diagram of the structure without the first grinding assembly.

[0022] Figure 5 It is a schematic diagram of the parts structure on the horizontal sliding plate.

[0023] Figure 6 It is a schematic diagram of the structure of the first grinding assembly.

[0024] Figure 7 yes Figure 6 Schematic diagram of the structure from another angle.

[0025] Figure 8 It is a schematic diagram of the structure of the eccentric shaft and the first shaft bearing.

[0026] Fig. 9 It is a schematic diagram of the structure of the center shaft and the second bearing.

[0027] Fig.10 It is a schematic diagram of the structure of the first horizontal motion component and the second horizontal motion component.

[0028] Fig.11 It is a schematic diagram of the internal structure of the support frame.

[0029] Reference numerals: 1, moving arm; 2, first vertical motion assembly; 201, screw lift; 202, first bracket; 203, horizontal sliding plate; 204, vertical guide rail; 205, first slider; 206, vertical sliding plate; 207, vertical sliding hole; 208, shaft hole; 3, second vertical motion assembly; 4, first grinding assembly; 401, fixed frame; 402, first motor; 403, abrasive belt; 404, tensioning wheel; 405, cylinder; 406, grinding wheel; 407, driving wheel; 408, eccentric shaft; 409, connecting ring; 410, center shaft; 411, first shaft bearing; 412, second vertical motion assembly; 413, first grinding assembly; 414, second vertical motion assembly; 415, first grinding assembly; 416, first grinding assembly; 417, first grinding assembly; 418, first grinding assembly; 419, first grinding assembly; 420, first grinding assembly; 421, first grinding assembly; 422, first grinding assembly; 423, first grinding assembly; 424, first grinding assembly; 425, first grinding assembly; 426, first grinding assembly; 427, first grinding assembly; 428, first grinding assembly; 429, first grinding assembly; 430, first grinding assembly; 431, first grinding assembly; 432, first grinding assembly; 433, first grinding assembly; 434, first grinding assembly; 435, first grinding assembly; 436, first grinding assembly; 437, first grinding assembly; 438, first grinding assembly; 439, first grinding assembly; 440, first grinding assembly; 441, first grinding assembly; 442, first grinding assembly; 443, first grinding assembly; 444, first grinding assembly; 445, first grinding assembly; 446, first grinding 2. Second bearing; 413. Second bracket; 5. Support frame; 6. First horizontal motion assembly; 601. Second motor; 602. First horizontal slide hole; 603. Slide rod; 604. First fixed plate; 605. First screw rod; 606. First guide rod; 607. First nut seat; 608. Second fixed plate; 7. Second horizontal motion assembly; 701. Third fixed plate; 702. Second screw rod; 703. Second slide block; 704. Second nut seat; 705. Second guide rod; 706. Fourth fixed plate; 707. Third motor; 708. Second horizontal slide hole; 8. Second grinding assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] like Figure 1 to Figure 2 As shown, the weld grinding mechanism of the hydrogen pipeline of this embodiment is composed of a movable arm 1, a first vertical motion component 2, a second vertical motion component 3, a first grinding component 4, a support frame 5, a first horizontal motion component 6, a second horizontal motion component 7, and a second grinding component 8.

[0032] A support frame 5 is arranged on the movable arm 1, and a first vertical motion component 2 is arranged on one side of the support frame 5, and a first grinding component 4 for grinding the weld of the hydrogen pipeline is fixedly installed on the first vertical motion component 2, and the first vertical motion component 2 drives the first grinding component 4 to move in the vertical direction, and a second vertical motion component 3 is arranged on the other side of the support frame 5, and a second grinding component 8 for grinding the weld of the hydrogen pipeline is fixedly installed on the second vertical motion component 3, and the second vertical motion component 3 drives the second grinding component 8 to move in the vertical direction, and a second horizontal motion component 7 and a first horizontal motion component 6 for driving the first vertical motion component 2 and the second vertical motion component 3 to slide in the horizontal direction are arranged on the support frame 5.

[0033] The structure of the first vertical motion assembly 2 is the same as that of the second vertical motion assembly 3. Figures 3 to 5As shown, the first vertical motion assembly 2 is composed of a screw lift 201, a first bracket 202, a horizontal sliding plate 203, a vertical guide rail 204, a first slider 205, a vertical sliding plate 206, a vertical sliding hole 207, and an axial hole 208.

[0034] The first vertical motion component 2 is: a horizontal sliding plate 203 is arranged on one side of the support frame 5, a vertical sliding hole 207 is processed on the horizontal sliding plate 203 and is slidably connected to the second sliding block 703 along the vertical direction, an axial hole 208 is processed on the horizontal sliding plate 203 and is clamped with the sliding rod 603, vertical guide rails 204 are respectively arranged on both sides of the horizontal sliding plate 203, each vertical guide rail 204 is respectively connected to the first sliding block 205 which slides along the vertical direction, the first sliding block 205 is fixedly connected to the vertical sliding plate 206, a first bracket 202 is arranged on the horizontal sliding plate 203, a screw lift 201 is arranged on the first bracket 202, the output end of the screw lift 201 is fixedly connected to the vertical sliding plate 206, and the vertical sliding plate 206 is fixedly connected to the first grinding component 4.

[0035] The structure of the first grinding assembly 4 is the same as that of the second grinding assembly 8. Figures 6 to 9 As shown, the first grinding assembly 4 is composed of a fixed frame 401, a first motor 402, a sanding belt 403, a tensioning wheel 404, a cylinder 405, a grinding wheel 406, a transmission wheel 407, an eccentric shaft 408, a connecting ring 409, a central shaft 410, a first shaft bearing 411, a second bearing 412, and a second bracket 413.

[0036] The first grinding assembly 4 is as follows: a fixed frame 401 is fixedly installed on the first vertical motion assembly 2, a second bracket 413 is arranged on the top of the fixed frame 401, a first motor 402 is arranged on the second bracket 413, the output shaft of the first motor 402 is fixedly connected to the transmission wheel 407, an eccentric shaft 408 is rotatably installed on the fixed frame 401, a tensioning wheel 404 is eccentrically arranged on the eccentric shaft 408, a first shaft bearing 411 is arranged between the outer circumference of the eccentric shaft 408 and the inner circumference of the tensioning wheel 404, the tensioning wheel 404 is located on the lower side of the transmission wheel 407, a cylinder 405 is arranged on the fixed frame 401, and the piston rod of the cylinder 405 is connected to the eccentric shaft 408 through a connecting ring 409. A central shaft 410 is rotatably mounted on the fixed frame 401, a grinding wheel 406 is arranged on the central shaft 410, a second bearing 412 is arranged between the outer circumference of the central shaft 410 and the inner circumference of the grinding wheel 406, the grinding wheel 406 is located below the transmission wheel 407, and the transmission wheel 407, the tensioning wheel 404 and the grinding wheel 406 are connected through the sanding belt 403.

[0037] like Figure 10 to Figure 11As shown, the first horizontal motion assembly 6 is composed of a second motor 601 , a first horizontal sliding hole 602 , a sliding rod 603 , a first fixing plate 604 , a first screw rod 605 , a first guide rod 606 , a first nut seat 607 , and a second fixing plate 608 .

[0038] The first horizontal motion component 6 is: a first fixed plate 604 and a second fixed plate 608 are arranged on the support frame 5, two first guide rods 606 are arranged between the first fixed plate 604 and the second fixed plate 608, a first screw rod 605 located between the two first guide rods 606 is rotatably installed between the first fixed plate 604 and the second fixed plate 608, a second motor 601 for driving the first screw rod 605 to rotate is arranged on the second fixed plate 608, the first screw rod 605 is threadedly connected to the first nut seat 607, and sliding rods 603 are respectively arranged on both sides of the first nut seat 607, and first horizontal sliding holes 602 are respectively processed on both sides of the support frame 5 to be slidably connected to the sliding rod 603 along the horizontal direction, wherein one end of the sliding rod 603 on one side is fixedly connected to the first vertical motion component 2, and the other end of the sliding rod 603 on the other side is fixedly connected to the second vertical motion component 3.

[0039] like Figure 10 to Figure 11 As shown, the second horizontal motion assembly 7 is composed of a third fixed plate 701, a second screw rod 702, a second slider 703, a second nut seat 704, a second guide rod 705, a fourth fixed plate 706, a third motor 707, and a second horizontal slide hole 708.

[0040] The second horizontal motion component 7 is as follows: a third fixing plate 701 and a fourth fixing plate 706 are provided on the support frame 5, two second guide rods 705 are provided between the third fixing plate 701 and the fourth fixing plate 706, a second screw rod 702 located between the two second guide rods 705 is rotatably installed between the third fixing plate 701 and the fourth fixing plate 706, a third motor 707 for driving the second screw rod 702 to rotate is provided on the fourth fixing plate 706, the second screw rod 702 is threadedly connected to the second nut seat 704, and second sliders 703 are respectively provided on both sides of the second nut seat 704, and second horizontal sliding holes 708 are respectively processed on both sides of the support frame 5 with which the second slider 703 is slidably connected in the horizontal direction, one end of the second slider 703 on one side is slidably connected to the first vertical motion component 2 in the vertical direction, and one end of the second slider 703 on the other side is slidably connected to the second vertical motion component 3 in the vertical direction.

[0041] The working principle of this embodiment is as follows: (1) adjusting the horizontal position: the output shaft of the second motor 601 drives the first screw rod 605 to rotate, and the first nut seat 607 moves in the horizontal direction on the first screw rod 605. At the same time, the first nut seat 607 slides in the horizontal direction on the two first guide rods 606. The sliding rods 603 on both sides of the first nut seat 607 slide in the first horizontal sliding holes 602 of the support frame 5 respectively. The sliding rod 603 on one side of the first nut seat 607 drives the first vertical motion component 2 and the first grinding component 4 to slide in the horizontal direction. The sliding rod 603 on the other side of the first nut seat 607 drives the second vertical motion component 3 and the second grinding component 8 to slide in the horizontal direction. According to the weld position of the hydrogen pipeline, the horizontal position of the first grinding component 4 and the second grinding component 8 is adjusted.

[0042] The output shaft of the third motor 707 drives the second screw rod 702 to rotate, and the second nut seat 704 slides horizontally on the second screw rod 702. At the same time, the second nut seat 704 slides horizontally on the two second guide rods 705, and the second sliders 703 on both sides of the second nut seat 704 slide horizontally in the second horizontal sliding holes 708 of the support frame 5 respectively.

[0043] When the horizontal movement positions of the first nut seat 607 and the second nut seat 704 are inconsistent, the second slider 703 on one side of the second nut seat 704 slides in the vertical direction in the vertical sliding hole 207 of the horizontal sliding plate 203. Since the working principle of the first vertical motion component 2 is the same as the working principle of the second vertical motion component 3, the second slider 703 on the other side of the second nut seat 704 is also slidably connected to the second vertical motion component 3.

[0044] (2) Adjusting the vertical position: The output end of the screw lift 201 drives the vertical sliding plate 206 to slide in the vertical direction. The first slider 205 on the vertical sliding plate 206 slides in the vertical direction on the vertical guide rail 204. The vertical sliding plate 206 drives the first grinding assembly 4 to move in the vertical direction. According to the weld position of the hydrogen pipeline, the vertical position of the first grinding assembly 4 is adjusted. The principle is the same as above. The second vertical motion assembly 3 can adjust the vertical position of the second grinding assembly 8.

[0045] (3) Grinding the weld of the hydrogen pipeline: The output shaft of the first motor 402 drives the transmission wheel 407 to rotate, and the transmission wheel 407 drives the tensioning wheel 404 and the grinding wheel 406 to rotate through the sanding belt 403. The sanding belt 403 is used to grind the weld of the hydrogen pipeline.

[0046] The output end of the cylinder 405 drives the eccentric shaft 408 to move through the connecting ring 409 , and the eccentric shaft 408 drives the tensioning wheel 404 to move, thereby tensioning the sanding belt 403 .

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A weld grinding mechanism for a hydrogen pipeline, characterized in that: A support frame (5) is provided on the movable arm (1); a first vertical motion component (2) is provided on one side of the support frame (5); a first grinding component (4) for grinding the weld of the hydrogen transmission pipeline is fixedly mounted on the first vertical motion component (2); the first vertical motion component (2) drives the first grinding component (4) to move in a vertical direction; a second vertical motion component (3) is provided on the other side of the support frame (5); a second grinding component (8) for grinding the weld of the hydrogen transmission pipeline is fixedly mounted on the second vertical motion component (3); the second vertical motion component (3) drives the second grinding component (8) to move in a vertical direction; and a second horizontal motion component (7) and a first horizontal motion component (6) are provided on the support frame (5); The structure of the first grinding assembly (4) is the same as that of the second grinding assembly (8). The first grinding assembly (4) comprises: a fixing frame (401) is fixedly mounted on the first vertical motion assembly (2), a second bracket (413) is arranged at the top of the fixing frame (401), a first motor (402) is arranged on the second bracket (413), an output shaft of the first motor (402) is fixedly connected to a transmission wheel (407), and a biasing member (413) is rotatably mounted on the fixing frame (401). A central shaft (408) is eccentrically provided with a tensioning wheel (404), the tensioning wheel (404) is located at one side below the driving wheel (407), a central shaft (410) is rotatably mounted on the fixed frame (401), a grinding wheel (406) is provided on the central shaft (410), the grinding wheel (406) is located below the driving wheel (407), and the driving wheel (407), the tensioning wheel (404) and the grinding wheel (406) are connected to each other through a grinding belt (403).

2. The weld grinding mechanism for the hydrogen pipeline according to claim 1, characterized in that: A first shaft bearing (411) is provided between the outer circumference of the eccentric shaft (408) and the inner circumference of the tension wheel (404).

3. The weld grinding mechanism for the hydrogen pipeline according to claim 1, characterized in that: A second bearing (412) is provided between the outer circumference of the central shaft (410) and the inner circumference of the grinding wheel (406).

4. The weld grinding mechanism for the hydrogen pipeline according to claim 1, characterized in that: The fixing frame (401) is provided with a cylinder (405), and a piston rod of the cylinder (405) is connected to the eccentric shaft (408) via a connecting ring (409).

5. The weld grinding mechanism for the hydrogen pipeline according to claim 1, characterized in that: The first horizontal motion component (6) comprises: a first fixing plate (604) and a second fixing plate (608) are arranged on the support frame (5); two first guide rods (606) are arranged between the first fixing plate (604) and the second fixing plate (608); a first screw rod (605) located between the two first guide rods (606) is rotatably installed between the first fixing plate (604) and the second fixing plate (608); a second motor (601) for driving the first screw rod (605) to rotate is arranged on the second fixing plate (608); the first screw rod (605) is threadedly connected to the first screw nut seat (607); sliding rods (603) are respectively arranged on both sides of the first screw nut seat (607); first horizontal sliding holes (602) are respectively processed on both sides of the support frame (5) and are slidably connected to the sliding rod (603) in the horizontal direction; one end of the sliding rod (603) on one side is fixedly connected to the first vertical motion component (2); and the other end of the sliding rod (603) on the other side is fixedly connected to the second vertical motion component (3).

6. The weld grinding mechanism for the hydrogen pipeline according to claim 1, characterized in that: The second horizontal motion assembly (7) comprises: a third fixing plate (701) and a fourth fixing plate (706) are arranged on the support frame (5); two second guide rods (705) are arranged between the third fixing plate (701) and the fourth fixing plate (706); a second screw rod (702) located between the two second guide rods (705) is rotatably installed between the third fixing plate (701) and the fourth fixing plate (706); and a third motor (706) is arranged on the fourth fixing plate (706) for driving the second screw rod (702) to rotate. 707), the second screw rod (702) is threadedly connected to the second nut seat (704), second sliders (703) are respectively arranged on both sides of the second nut seat (704), and second horizontal sliding holes (708) are respectively processed on both sides of the support frame (5) and are connected to the second slider (703) in a horizontal sliding direction, wherein one end of the second slider (703) on one side is connected to the first vertical motion component (2) in a vertical sliding direction, and one end of the second slider (703) on the other side is connected to the second vertical motion component (3) in a vertical sliding direction.

7. The weld grinding mechanism for a hydrogen pipeline according to claim 5 or 6, characterized in that: The structure of the first vertical motion assembly (2) is the same as that of the second vertical motion assembly (3). The first vertical motion assembly (2) comprises: a horizontal sliding plate (203) is arranged on one side of the support frame (5); a vertical sliding hole (207) is processed on the horizontal sliding plate (203) and is slidably connected to the second sliding block (703) in a vertical direction; an axial hole (208) is processed on the horizontal sliding plate (203) and is clamped to the sliding rod (603); and vertical sliding holes (207) are respectively arranged on both sides of the horizontal sliding plate (203). A straight guide rail (204), each vertical guide rail (204) is connected to a first slider (205) for sliding in a vertical direction, the first slider (205) is fixedly connected to a vertical sliding plate (206), a first bracket (202) is arranged on the horizontal sliding plate (203), a screw lift (201) is arranged on the first bracket (202), an output end of the screw lift (201) is fixedly connected to the vertical sliding plate (206), and the vertical sliding plate (206) is fixedly connected to a first grinding assembly (4).

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