Polishing device for longitudinal welds of central section of chemical heat-insulated tank

Abstract

The application provides a polishing device for longitudinal weld seams of a center section of a chemical heat-insulated storage tank, and belongs to the technical field of weld seam polishing. The polishing device is used to solve the problem of poor treatment effect and low practicability of existing weld seam treatment equipment. The polishing device is characterized in that a hydraulic device is used to control the contact between a polishing machine and the surface of a tank body, a double-head motor is started, the motor drives a guide rod to slide left and right through a reciprocating mechanism, the polishing machine is guided to move back and forth in an arc shape due to the arc-shaped block and arc-shaped groove, and the welding position and the surrounding area on the surface of the tank body are polished and ground. During the grinding process, the double-head motor drives a worm to slowly rotate a worm wheel, the worm wheel engages with a rack to slowly displace the polishing guide assembly and the polishing machine, and the weld seams on the whole tank body are polished. The polishing device can comprehensively treat the welding position and the surrounding area on the surface of the tank body, improve the surface quality of the tank body, solve the problem that the surrounding area of the weld seams is not treated cleanly due to the influence of welding heat in the traditional treatment mode, and has high practicability and economic efficiency.

Description

Technical Field

[0001] This invention relates to the field of weld polishing technology, and more particularly to a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank. Background Technology

[0002] In the chemical industry, insulated storage tanks are key equipment for storing cryogenic or high-temperature media. These tanks consist of a tank body with openings on both sides and end caps. The tank body is made by cold-rolling or hot-rolling cut steel plates using a plate rolling machine. By adjusting the pressure and angle of the rollers, the flat plate is gradually rolled into a cylindrical shape, and then welded along the seams. The welding quality of the tank body directly affects the safety of media storage and the insulation performance. The longitudinal weld seam in the central section is a crucial connection point in the main structure of the storage tank. Defects such as weld protrusions and slag residue generated during the welding process can not only lead to stress concentration but may also cause problems such as increased media flow resistance or insulation layer adhesion failure due to surface unevenness. In existing technologies, milling and polishing devices are typically used to treat tank welds, employing milling cutters that match the weld contour to mill the raised areas. However, due to limitations in the geometry of the milling cutters and the curved shape of the tank body, traditional devices cannot effectively treat the weld body itself. The heat-affected zones (HAZs) on both sides of the weld undergo changes in metal structure and develop microscopic surface defects due to thermal stress during welding. These defects typically extend 2-3 times beyond the weld width, and the complex geometry of the transition area between this region and the tank base material makes it difficult for the milling cutter to precisely cover the weld when moving along its trajectory. Actual engineering tests show that if residual oxide scale, microcracks, and other defects in the HAZ are not effectively removed, they can easily lead to stress corrosion cracking due to temperature cycling during long-term storage of the medium. This is especially problematic in scenarios with extremely high surface integrity requirements, such as LNG cryogenic storage tanks, where such issues have become a key factor limiting the service life of storage tanks. CN110434744B discloses a high-efficiency weld polishing machine, including a polishing base, a drive device, a controller, a sealing and fixing sliding device, and an automatic adjustment polishing device. This weld polishing machine effectively adheres the polishing base to the tank body through the cooperation of a telescopic column and a compression spring, and the magnetic force between a miniature permanent magnet lifter and the tank body. Simultaneously, it can move along the weld seam. Furthermore, the combination of a long strip of high-temperature resistant rubber sheet and another high-temperature resistant rubber sheet effectively shields and adheres waste debris to the miniature permanent magnet lifter, preventing debris from splashing and causing injury to workers. An infrared distance sensor detects the diameter of the polishing wheel, and an infrared distance sensor detects the position of the cylinder, automatically adjusting the polishing wheel to achieve a more aesthetically pleasing weld polishing. While this existing technology can polish weld seams, it is not compatible with the outer surface of the tank body, preventing precise polishing of the heat-affected zones on both sides of the weld seam. Therefore, how to design a polishing device that can take into account both the weld body and the surrounding heat-affected zone, and achieve precise cutting under complex curved surfaces, has become a technical problem that urgently needs to be solved in the current chemical storage tank manufacturing field. Summary of the Invention

[0003] The purpose of this invention is to provide a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank, which solves the problem of poor processing effect of existing weld seam polishing equipment in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank, comprising a workbench and outer shells disposed on both sides of the top of the workbench, and a polishing machine movably disposed between the two sets of outer shells. A polishing guide assembly is slidably disposed between the two sets of outer shells, and the polishing machine is installed below the polishing guide assembly. A fixing mechanism is disposed on the lower sides of the inner sides of the outer shells, and the fixing mechanism is used to position the tank. A guide column is installed between the two sets of outer shells, and the guide column is used to guide the polishing guide assembly and the polishing machine. The polishing guide assembly includes a housing and a dual-head motor, a reciprocating motion mechanism, and a guide mechanism disposed inside the housing. The housing has a movable groove that opens downwards, and an arc-shaped groove is disposed on the side wall of the movable groove inside the housing. The guide mechanism includes a guide rod movably disposed inside the movable groove. The bottom of the guide rod extends to the outside of the housing and is slidably connected to a sliding sleeve. The bottom of the sliding sleeve is fixedly connected to the polishing machine. An arc-shaped block is fixedly connected to the guide rod and is slidably connected inside the arc-shaped groove. The reciprocating motion mechanism is used to drive the guide mechanism to slide in an arc shape, and the guide mechanism is used to drive the polishing machine to polish the surface of the tank in an arc-shaped trajectory.

[0005] Furthermore, the top of the workbench is provided with a placement slot for initial positioning of the tank. The inner side of the outer shell is provided with an upper mounting slot, and the lower part of the inner shell is provided with a lower mounting slot. The fixing mechanism is installed in the lower mounting slot, and the guide column is set inside the upper mounting slot. The guide column is horizontally fixed and parallel to the workbench. The top of the shell is fixedly connected with a guide member, which is slidably connected to the guide column.

[0006] Furthermore, the interior of the housing is provided with a rotating groove. The reciprocating motion mechanism includes a turntable rotatably connected inside the rotating groove. The turntable is connected to one output end of the dual-head motor. An eccentric shaft is fixedly connected to the outer edge of the reciprocating motion mechanism. A sliding groove is provided on the side wall of the movable groove inside the housing. The reciprocating motion mechanism also includes a slider slidably connected inside the sliding groove. A shaft is fixedly installed on the slider. A movable rod is movably installed between the shaft and the eccentric shaft. A pre-set groove corresponding to the shaft is provided on the guide rod. The shaft passes through the pre-set groove. When the dual-head motor is driven, it drives the turntable to rotate. Under the action of the eccentric shaft, the shaft slides laterally back and forth through the guide of the movable rod and the slider, thereby driving the guide rod to slide laterally back and forth. Since the arc-shaped block on the guide rod is slidably connected inside the arc-shaped groove, the polishing machine below slides in an arc shape. A hydraulic device is installed between the outer wall of the guide rod and the top of the polishing machine. The extension and retraction of the hydraulic device allows the polishing machine to fit against the surface of tanks of different diameters.

[0007] Furthermore, a linkage mechanism is also provided inside the housing. The linkage mechanism includes a worm and a worm wheel rotatably connected inside the housing, with the bottom of the worm wheel extending to the outside of the housing. The worm meshes with the worm wheel, and the worm is fixedly connected to the other output end of the dual-head motor. When the dual-head motor rotates, it drives the worm to rotate, which in turn drives the worm wheel to rotate slowly. A rack is fixedly connected to the lower part of the upper mounting groove, and the worm wheel meshes with the rack. When the dual-head motor rotates, the worm wheel rotates slowly to mesh with the rack, so that the entire polishing guide assembly and polishing machine move slowly on the surface of the tank under the guidance of the guide column.

[0008] Furthermore, the fixing mechanism includes a fixing rod fixedly connected to the inner wall of the top of the lower mounting groove, a slide rod sliding horizontally through the fixing rod, a limit block fixedly connected to one end of the slide rod, a fixing block fixedly connected to the middle of the slide rod located inside the fixing rod, the fixing mechanism also includes a movable plate slidably connected to the slide rod, and a fixing plate fixedly connected to the other end of the fixing rod, multiple sets of clamps evenly distributed on the fixing plate, a movable frame movably installed between the clamps and the movable plate, a return spring fitted on the outside of the slide rod between the fixing block and the movable plate, and a telescopic cylinder fixedly installed inside the lower mounting groove, the output end of the telescopic cylinder being fixedly connected to the movable plate through the fixing frame.

[0009] Furthermore, a sliding groove is provided through the fixed plate, and multiple sets of sliding grooves are provided. The clamp includes a sliding rod slidably connected inside the sliding groove. One end of the sliding rod is fixedly connected to a fixed seat. The surface of the fixed seat is provided with a pad, which contacts the inner wall of the tank. The two ends of the movable frame are rotatably connected to the side of the movable plate and the sliding rod, respectively. After the tank is placed above the placement groove, the telescopic cylinder extends and drives the movable plate to move closer to the end of the tank. At this time, under the action of the return spring, the return spring pulls the sliding rod to move towards the end of the tank until the fixed plate and the clamp are inside the tank. The limiting block contacts the fixed rod, and the sliding rod can no longer move. At this time, the telescopic cylinder continues to extend, so that the movable plate slides on the sliding rod and gets closer and closer to the fixed plate. The clamps outside the fixed plate are fully expanded under the action of the movable frame and fully contact the inner wall of the tank, so that the tank is fixed and the center of the tank coincides with the center point of the arc movement of the polishing machine. Only then can the movement of the polishing machine fit the outer wall of the tank.

[0010] Compared with the prior art, the beneficial effects of the present invention include: the longitudinal weld polishing device for the central section of a chemical insulated storage tank provided by the present invention features a telescopic cylinder that extends. Under the action of a return spring, the sliding rod moves, causing the fixed plate and clamp to extend into the tank body. After the limiting block is blocked by the fixed rod, the telescopic cylinder continues to extend, causing the movable plate to approach the fixed plate. The clamp opens, lifting and fixing the tank body. The polishing machine is controlled by a hydraulic system to contact the tank surface. A dual-head motor is started, and the motor drives the guide rod to slide left and right through a reciprocating motion mechanism. Due to the guidance of the arc-shaped block and arc-shaped groove, the polishing machine performs arc-shaped reciprocating motion, polishing the welded area and surrounding area of ​​the tank surface. The polishing process involves a dual-head motor driving a worm gear to slowly rotate during polishing. The worm gear meshes with a rack, causing the polishing guide assembly and polishing machine to slowly shift, polishing the weld seams on the entire exterior of the tank. This allows for comprehensive treatment of the welded areas and surrounding regions on the tank surface, improving the surface quality of the tank. It solves the problem of incomplete treatment of the heat-affected zone around the weld seams in traditional methods and is applicable to tanks of various diameters. The entire polishing process is automatically completed through mechanical structure and motor control, reducing manual intervention and improving production efficiency. The device has a relatively simple structure, low cost, and high practicality and economy. Attached Figure Description

[0011] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The schematic diagram shows the overall structure of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 2The schematic diagram shows an overall structural breakdown of a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 3 The schematic diagram shows a cross-sectional view of the workbench and outer shell structure of a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 4 The schematic diagram shows the fixing mechanism, guide column, and polishing guide assembly of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 5 The schematic diagram shows the guide column, polishing guide assembly, polishing machine, and rack structure of a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 6 The schematic diagram shows a polishing guide assembly and a polishing machine structure of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 7 The schematic diagram shows a cross-sectional view of the shell structure of a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 8 The schematic diagram shows a partial structural diagram of the polishing guide assembly of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 9 An exploded view of the polishing guide assembly of a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank, according to an embodiment of the present invention, is shown schematically. Figure 10 The schematic diagram shows a fixed mechanism structure of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank according to an embodiment of the present invention. Figure 11 An exploded view of the fixing mechanism structure of a polishing device for the longitudinal weld seam of the center section of a chemical insulation storage tank, according to an embodiment of the present invention, is shown schematically.

[0012] Numbered in the diagram: 1. Workbench; 11. Placement slot; 2. Outer shell; 21. Upper mounting slot; 22. Lower mounting slot; 3. Fixing mechanism; 31. Fixing rod; 32. Sliding rod; 321. Limiting block; 322. Fixing block; 323. Return spring; 33. Fixing plate; 331. Slide groove; 34. Fixture; 341. Sliding rod; 342. Fixing seat; 343. Pad; 35. Movable frame; 36. Movable plate; 37. Telescopic cylinder; 371. Fixing frame; 4. Guide column; 5. Polishing guide assembly; 51. Outer shell 511. Rotating groove; 512. Movable groove; 513. Sliding groove; 514. Arc groove; 52. Guide component; 53. Double-headed motor; 54. Reciprocating motion mechanism; 541. Turntable; 542. Eccentric shaft; 543. Movable rod; 544. Shaft; 545. Slider; 55. Guide mechanism; 551. Guide rod; 552. Sliding sleeve; 553. Arc block; 554. Preset groove; 56. Hydraulic device; 57. Linkage mechanism; 571. Worm gear; 572. Worm wheel; 6. Polishing machine; 7. Rack. Detailed Implementation

[0013] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0014] According to the embodiments of the present invention, Figures 1-11 As shown. Figures 1-2 As shown, a polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank includes a workbench 1 and outer shells 2 set on both sides of the top of the workbench 1. It also includes a polishing machine 6 movably set between the two sets of outer shells 2. A polishing guide assembly 5 is slidably set between the two sets of outer shells 2. The polishing machine 6 is installed below the polishing guide assembly 5. A fixing mechanism 3 is set on the lower side of the inner side of the outer shell 2. The fixing mechanism 3 is used to position the tank. A guide column 4 is installed between the two sets of outer shells 2. The guide column 4 is used to guide the polishing guide assembly 5 and the polishing machine 6. like Figure 6-7As shown, the polishing guide assembly 5 includes a housing 51 and a dual-head motor 53, a reciprocating motion mechanism 54, and a guide mechanism 55 disposed inside the housing 51. The housing 51 has a movable groove 512 inside, which opens downward. An arc-shaped groove 514 is disposed on the side wall of the movable groove 512 inside the housing 51. The guide mechanism 55 includes a guide rod 551 movably disposed inside the movable groove 512. The bottom of the guide rod 551 extends to the outside of the housing 51 and is slidably connected to a sliding sleeve 552. The bottom of the sliding sleeve 552 is fixedly connected to the polishing machine 6. An arc-shaped block 553 is fixedly connected to the guide rod 551 and is slidably connected inside the arc-shaped groove 514. The reciprocating motion mechanism 54 is used to drive the guide mechanism 55 to slide in an arc shape. The guide mechanism 55 is used to drive the polishing machine 6 to polish the surface of the tank in an arc-shaped trajectory.

[0015] like Figures 1-2 As shown, the top of the workbench 1 is provided with a placement slot 11, which is used for the initial positioning of the tank, such as... Figure 3 As shown, an upper mounting groove 21 is provided on the inner side of the outer casing 2, and a lower mounting groove 22 is provided on the lower part of the inner side of the outer casing 2. The fixing mechanism 3 is installed in the lower mounting groove 22.

[0016] The guide post 4 is set inside the upper mounting groove 21. The guide post 4 is horizontally fixed and parallel to the worktable 1. The top of the housing 51 is fixedly connected to the guide member 52, which is slidably connected to the guide post 4.

[0017] like Figures 7-9 As shown, the housing 51 also has a rotating groove 511 inside. The reciprocating motion mechanism 54 includes a turntable 541 rotatably connected inside the rotating groove 511. The turntable 541 is connected to one output end of the dual-head motor 53. An eccentric shaft 542 is fixedly connected to the outer edge of the reciprocating motion mechanism 54. A sliding groove 513 is provided on the side wall of the movable groove 512 inside the housing 51. The reciprocating motion mechanism 54 also includes a slider 545 slidably connected inside the sliding groove 513. A shaft 544 is fixedly installed on the slider 545. A movable rod 543 is movably installed between the shaft 544 and the eccentric shaft 542. A guide rod 551 is provided with... The shaft 544 corresponds to the preset groove 554, and the shaft 544 passes through the preset groove 554. When driven by the dual-head motor 53, the turntable 541 rotates. Under the action of the eccentric shaft 542, the shaft 544 slides laterally back and forth through the guide of the movable rod 543 and the slider 545, which in turn drives the guide rod 551 to slide laterally back and forth. Since the arc block 553 on the guide rod 551 is slidably connected inside the arc groove 514, the polishing machine 6 below slides in an arc shape. A hydraulic device 56 is installed between the outer wall of the guide rod 551 and the top of the polishing machine 6. The extension and retraction of the hydraulic device 56 allows the polishing machine 6 to fit against the surface of tanks of different diameters.

[0018] like Figure 9 As shown, a linkage mechanism 57 is also provided inside the housing 51. The linkage mechanism 57 includes a worm 571 and a worm wheel 572 rotatably connected inside the housing 51. The bottom of the worm wheel 572 extends to the outside of the housing 51. The worm 571 meshes with the worm wheel 572. The worm 571 is fixedly connected to the output end of the other side of the dual-head motor 53. When the dual-head motor 53 rotates, it drives the worm 571 to rotate, which in turn drives the worm wheel 572 to rotate slowly.

[0019] like Figure 5 As shown, a rack 7 is fixedly connected to the lower part of the upper mounting groove 21. The worm gear 572 is meshed with the rack 7. When the dual-head motor 53 rotates, the worm gear 572 slowly rotates to mesh with the rack 7, so that the entire polishing guide assembly 5 and the polishing machine 6 move slowly on the surface of the tank under the guidance of the guide column 4.

[0020] like Figures 10-11 As shown, the fixing mechanism 3 includes a fixing rod 31 fixedly connected to the inner wall of the top of the lower mounting groove 22. A slide rod 32 slides horizontally through the fixing rod 31. A limit block 321 is fixedly connected to one end of the slide rod 32. A fixing block 322 is fixedly connected to the middle of the slide rod 32 at the position inside the fixing rod 31. The fixing mechanism 3 also includes a movable plate 36 slidably connected to the slide rod 32 and a fixed plate 33 fixedly connected to the other end of the fixing rod 31. Multiple sets of clamps 34 are evenly distributed on the fixed plate 33. A movable frame 35 is movably installed between the clamps 34 and the movable plate 36. A return spring 323 is fitted on the outside of the slide rod 32 between the fixed block 322 and the movable plate 36. A telescopic cylinder 37 is fixedly installed inside the lower part of the lower mounting groove 22. The output end of the telescopic cylinder 37 is fixedly connected to the movable plate 36 through the fixed frame 371.

[0021] A sliding groove 331 is provided through the fixed plate 33. Multiple sets of sliding grooves 331 are provided. The clamp 34 includes a sliding rod 341 slidably connected inside the sliding groove 331. One end of the sliding rod 341 is fixedly connected to a fixed seat 342. A pad 343 is provided on the surface of the fixed seat 342, and the pad 343 contacts the inner wall of the tank. Both ends of the movable frame 35 are rotatably connected to the side of the movable plate 36 and the sliding rod 341, respectively. After the tank is placed above the placement slot 11, the telescopic cylinder 37 extends, driving the movable plate 36 to approach the end of the tank. At this time, under the action of the return spring 323, the return spring... The spring 323 pulls the slide bar 32 towards the end of the tank until the fixed plate 33 and the clamp 34 are inside the tank. Then the limit block 321 contacts the fixed rod 31, and the slide bar 32 can no longer move. At this time, the telescopic cylinder 37 continues to extend, so that the movable plate 36 slides on the slide bar 32 and gets closer and closer to the fixed plate 33. The clamp 34 outside the fixed plate 33 is fully extended under the action of the movable frame 35 and fully contacts the inner wall of the tank, so that the tank is fixed. The center of the tank coincides with the center point of the arc movement of the polishing machine 6. Only then can the polishing machine 6 move to fit the outer wall of the tank.

[0022] Specifically, the tank is placed above the placement slot 11, and then the telescopic cylinder 37 extends, driving the slide rod 32 to move under the action of the return spring 323. During the movement, the fixed plate 33 and the clamp 34 extend into the tank. When the limiting block 321 at the end of the slide rod 32 is blocked by the fixed rod 31, the telescopic cylinder 37 continues to extend, causing the movable plate 36 to move closer to the fixed plate 33. Under the action of the movable frame 35, the clamp 34 opens, lifting and fixing the tank. Then, the hydraulic device 56 controls the polishing machine 6 to contact the surface of the tank, activating the double-headed polishing machine. The motor 53, a double-headed motor 53, drives the guide rod 551 to slide left and right through the reciprocating motion mechanism 54. When the guide rod 551 slides, it is guided by the arc block 553 and the arc groove 514, causing the polishing machine 6 to perform arc reciprocating motion and polish the welded area and surrounding area of ​​the tank surface. During the polishing process, the double-headed motor 53 drives the worm wheel 572 to rotate slowly through the worm 571. The worm wheel 572 meshes with the rack 7, causing the polishing guide assembly 5 and the polishing machine 6 to slowly move and polish the weld seam on the entire outside of the tank.

[0023] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A polishing device for the longitudinal welds of the central section of a chemical adiabatic tank, comprising a worktable (1) and two housings (2) arranged on the top of the worktable (1) on both sides, and a polishing machine (6) movably arranged between the two housings (2), characterized in that: A polishing guide assembly (5) is slidably disposed between the two sets of outer shells (2). A polishing machine (6) is installed below the polishing guide assembly (5). A fixing mechanism (3) is provided on the lower sides of the inner side of the outer shell (2). The fixing mechanism (3) is used to position the tank. A guide column (4) is installed between the two sets of outer shells (2). The guide column (4) is used to guide the polishing guide assembly (5) and the polishing machine (6). The polishing guide assembly (5) includes a housing (51) and a dual-head motor (53), a reciprocating motion mechanism (54), and a guide mechanism (55) disposed inside the housing (51). The housing (51) has an internal movable groove (512) that opens downwards. An arc-shaped groove (514) is provided on the side wall of the movable groove (512) inside the housing (51). The guide mechanism (55) includes a guide rod (551) movably disposed inside the movable groove (512). The bottom of the rod (551) extends to the outside of the housing (51) and is slidably connected to the sliding sleeve (552). The bottom of the sliding sleeve (552) is fixedly connected to the polishing machine (6). An arc block (553) is fixedly connected to the guide rod (551). The arc block (553) is slidably connected inside the arc groove (514). The reciprocating motion mechanism (54) is used to drive the guide mechanism (55) to slide in an arc. The guide mechanism (55) is used to drive the polishing machine (6) to polish the surface of the tank in an arc trajectory.

2. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as claimed in claim 1, wherein: The top of the workbench (1) is provided with a placement slot (11), which is used for the initial positioning of the tank.

3. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as defined in claim 1 wherein: The inner side of the outer shell (2) is provided with an upper mounting groove (21), and the lower part of the inner side of the outer shell (2) is provided with a lower mounting groove (22). The fixing mechanism (3) is installed in the lower mounting groove (22).

4. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as defined in claim 3 wherein: The guide post (4) is set inside the upper mounting groove (21). The guide post (4) is horizontally fixed and parallel to the workbench (1). The top of the housing (51) is fixedly connected to the guide member (52), which is slidably connected to the guide post (4).

5. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as defined in claim 4 wherein: The housing (51) is further provided with a rotating groove (511). The reciprocating motion mechanism (54) includes a turntable (541) rotatably connected inside the rotating groove (511). The turntable (541) is connected to one output end of the dual-head motor (53). An eccentric shaft (542) is fixedly connected to the outer side of the reciprocating motion mechanism (54) near the edge. A sliding groove (513) is provided inside the housing (51) on the side wall of the movable groove (512). The reciprocating motion mechanism (54) also includes a slider (545) slidably connected inside the sliding groove (513). A shaft (544) is fixedly installed on the slider (545). A movable rod (543) is movably installed between the shaft (544) and the eccentric shaft (542).

6. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as defined in claim 5 wherein: The guide rod (551) is provided with a preset groove (554) corresponding to the shaft (544), and the shaft (544) passes through the preset groove (554).

7. The apparatus for polishing longitudinal welds of a center section of a chemical process heat transfer tank as defined in claim 6 wherein: The housing (51) is also provided with a linkage mechanism (57). The linkage mechanism (57) includes a worm (571) and a worm wheel (572) rotatably connected inside the housing (51). The bottom of the worm wheel (572) extends to the outside of the housing (51). The worm (571) meshes with the worm wheel (572). The worm (571) is fixedly connected to the output end of the dual-head motor (53) on the other side.

8. The polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank as described in claim 7, characterized in that: A rack (7) is fixedly connected to the lower part of the upper mounting groove (21), and the worm gear (572) meshes with the rack (7).

9. The polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank as described in claim 3, characterized in that: The fixing mechanism (3) includes a fixing rod (31) fixedly connected to the inner wall of the top of the lower mounting groove (22), a sliding rod (32) sliding horizontally through the fixing rod (31), a limit block (321) fixedly connected to one end of the sliding rod (32), and a fixing block (322) fixedly connected to the middle of the sliding rod (32) at the position inside the fixing rod (31). The fixing mechanism (3) also includes a movable plate (36) slidably connected to the sliding rod (32), and a fixed plate fixedly connected to the other end of the fixing rod (31). The fixed plate (33) has multiple sets of clamps (34) evenly distributed on it. A movable frame (35) is movably installed between the clamps (34) and the movable plate (36). A return spring (323) is fitted on the outside of the slide rod (32) between the fixed block (322) and the movable plate (36). A telescopic cylinder (37) is fixedly installed inside the lower mounting groove (22). The output end of the telescopic cylinder (37) is fixedly connected to the movable plate (36) through the fixed frame (371).

10. The polishing device for the longitudinal weld seam of the central section of a chemical insulation storage tank as described in claim 9, characterized in that: The fixed plate (33) is provided with a sliding groove (331) through it. Multiple sets of sliding grooves (331) are provided. The clamp (34) includes a sliding rod (341) that is slidably connected inside the sliding groove (331). One end of the sliding rod (341) is fixedly connected to a fixed seat (342). The surface of the fixed seat (342) is provided with a pad (343). The pad (343) contacts the inner wall of the tank. The two ends of the movable frame (35) are rotatably connected to the side of the movable plate (36) and the sliding rod (341) respectively.

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