A liquid high-position storage tank inner cylinder welding process and the storage tank

Abstract

This invention relates to the field of high-level storage tank welding technology, specifically to a welding process and tank for the inner cylinder of a high-level liquid storage tank. The process includes an insertion welding device comprising a main sleeve, a fork-shaped component one, a fork-shaped component two, and a welding torch. One end of the main sleeve is rotatably fitted with a ring sleeve. A sleeve is fixed to the outer wall of the main sleeve, and a rotating module is installed between the sleeve and the ring sleeve. The rotating module drives the ring sleeve to rotate. The fork-shaped component one includes a main cross rod one and a main cross rod two, which are rotatably connected to the ring sleeve. The main cross rods one and two are arranged in a cross configuration. A tensioning module is installed on the ring sleeve. In this invention, the insertion welding device allows welding to be performed inside the cylinder through a window on the side wall of the tank, thereby welding the inner side of the last circumferential seam. This ensures that the inner and outer sides of all circumferential seams on the main body of the tank are welded, thus improving the welding effect and increasing the pressure-bearing length of the tank.

Description

Technical Field

[0001] This invention relates to the field of welding technology for high-level storage tanks, specifically a welding process for the inner cylinder of a high-level liquid storage tank and the storage tank itself. Background Technology

[0002] Expansion tanks, also known as high-level storage tanks, are essential in liquid phase thermal oil heating systems. They are typically located at the highest point of the system, and in addition to accommodating the thermal expansion of the heat transfer fluid, they also serve other important functions, such as venting light components from newly filled products and low-boiling-point substances generated during operation, supplementing evaporation and operational losses, and nitrogen sealing. Their operating environment requires high-level storage tanks to be resistant to high temperatures, pressures, and corrosion. Due to their large volume, the tank body is generally formed by welding a cylindrical body and two end caps. Because the plates are thick, the circumferential and longitudinal seams are typically welded from the inside out. While personnel can enter the cylindrical body to weld the inner side of the earlier circumferential seams, welding the last end cap to the cylindrical body becomes difficult when personnel cannot easily enter through the opening on the cylindrical body, thus affecting the overall strength of the tank. Summary of the Invention

[0003] The purpose of this invention is to provide a welding process for the inner cylinder of a high-level liquid storage tank and the storage tank itself, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A welding process for the inner cylinder of a high-level liquid storage tank specifically includes the following steps:

[0006] Step 1: First, weld the longitudinal seam of the ring belt. When welding the seam, follow the steps of external tack welding, internal welding, external weld cleaning and grinding, and external welding.

[0007] Step 2: Align multiple rings and weld the circumferential seams, following the order from inside to outside, to form a cylinder;

[0008] Step 3: Weld an end cap to one end of the cylinder and weld both the inner and outer sides of the circumferential seam;

[0009] Step 4: Open a window on the cylinder and weld a flange pipe onto the window;

[0010] Step 5: Align the other end cap with the other end of the cylinder, perform a tack weld on the outside of the circumferential seam, and then insert a welding probe into the cylinder through the flange pipe to weld the inside of the circumferential seam at the other end of the cylinder. Then, re-weld the outside of the circumferential seam at the other end of the cylinder to form the tank.

[0011] Furthermore, the probe welding device includes:

[0012] The main sleeve has a ring sleeve rotatably fitted at one end. A sleeve is fixed to the outer wall of the main sleeve. A rotating module is installed between the sleeve and the ring sleeve. The rotating module is used to drive the ring sleeve to rotate.

[0013] A fork-shaped component one includes a main cross rod one and a main cross rod two, which are rotatably connected to a ring sleeve. The main cross rod one and the main cross rod two are arranged crosswise. A retraction module is installed on the ring sleeve, which is used to control the retraction and retraction of the fork-shaped component one.

[0014] Fork-shaped component two is installed on one side of fork-shaped component one. Two extension frame assemblies are installed between fork-shaped component two and fork-shaped component one. A retractable module is installed inside the ring sleeve. The retractable module is used to control the extension and retraction of the extension frame assemblies. Fork-shaped component two can be unfolded, moved forward and rotated as a whole.

[0015] The welding torch is fixedly mounted on the fork-shaped component two.

[0016] Furthermore, the tensioning module includes a core tube and a drive rod 1. The drive rod 1 is installed inside the sleeve. An internally threaded tube is rotatably connected between the inner walls of the ring sleeve. A screw is screwed into the internally threaded tube. Two support rods are rotatably connected to the bottom end of the screw. The main cross rod 1 and the main cross rod 2 are both rotatably connected to the end of the support rod on the adjacent side. A bevel gear 2 is fixedly installed at the bottom end of the drive rod 1. A bevel gear 1 is fixedly sleeved at the top end of the internally threaded tube. Two bevel gears 3 are fixedly installed on the core tube. The two bevel gears 3 mesh with bevel gears 2 and 1, respectively.

[0017] Furthermore, the rotating module includes a third drive rod, which is rotatably sleeved with the inner wall of the sleeve. The first drive rod is rotatably installed inside the third drive rod. A beveled ring is fixedly installed on the outer wall of one end of the ring sleeve. The bottom end of the third drive rod is connected to the beveled ring in a transmission manner.

[0018] Furthermore, the lengths of the first and second main crossbars are adjustable, and both ends of the second main crossbar are equipped with wheels. The second fork-shaped assembly includes a collar, on which the first and second secondary crossbars are rotatably connected. The lengths of the first and second secondary crossbars are adjustable, and both ends of the first and second secondary crossbars are equipped with ball bearings. The welding torch is installed at one end of the second secondary crossbar.

[0019] Furthermore, the extension frame assembly is installed between the main crossbar and the secondary crossbar. The extension frame assembly includes two guide rails, and an X-shaped telescopic frame is installed between the two guide rails. Both ends of the X-shaped telescopic frame are provided with a fixed end and a movable end. The fixed end is fixed to the guide rail, and a slide block is rotatably connected to the movable end. The slide block is slidably connected to the guide rail, and a pull cable is fixedly connected to one of the slide blocks. The retraction module is used to retract the pull cable. The main crossbar and the secondary crossbar are respectively fixedly connected to the adjacent guide rail.

[0020] Furthermore, the pull-back module includes a retainer and an externally threaded tube. The retainer is rotatably mounted on the inner side of the ring. Two long grooves (first) are formed on the inner sidewall of the other end of the ring, and two long grooves (second) are formed in the middle of the ring. The retainer is fixedly connected to the main cross rod (first) through the long grooves (second). Two guide wheels are rotatably connected to one end of the retainer, and a slide is slidably connected to the other end of the retainer. A slip ring is rotatably connected to one side of the slide. One end of the externally threaded tube is rotatably connected to the main sleeve. A connecting frame is screwed onto the externally threaded tube. The connecting frame is fixedly installed between the connecting frame and the slip ring. One end of the cable passes over the guide wheels and is fixedly installed between the cable and the slide. A drive rod (second) is rotatably connected to the other end of the main sleeve. A bevel gear (fourth) is fixedly sleeved on one end of the externally threaded tube. The bottom end of the drive rod (second) is connected to the externally threaded tube through the bevel gear (fourth). A fixing plate is rotatably connected between the bottom ends of the drive rod (first) and the drive rod (second). The connecting frame is slidably connected to the fixing plate.

[0021] Furthermore, two pairs of compression rods are provided between the two ends of the main cross rod 2 and the secondary cross rod 2, and one end of the two compression rods in the same pair is rotatably connected to each other. The main cross rod 2 and the secondary cross rod 2 are respectively rotatably connected to the other end of the compression rod on the adjacent side, and a return spring is fixedly connected between the two compression rods in the same pair.

[0022] Furthermore, a limiting bracket assembly is installed at one end of the sleeve, the limiting bracket assembly being used to engage with the flange pipe and limit the movement of the sleeve.

[0023] A liquid high-level storage tank includes a tank structure, which is welded from a cylindrical body and two end caps, and the inner and outer sides of the circumferential seam between the cylindrical body and the end caps are welded together.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. By setting up an insertion welding device, the device can be inserted into the cylinder through a window on the side wall of the tank to weld the inner side of the last circumferential seam. This ensures that the inner and outer sides of all circumferential seams on the main body of the tank are welded, thereby improving the welding effect and increasing the pressure-bearing length of the tank.

[0026] 2. With the setup of fork-shaped component one and fork-shaped component two, initially, fork-shaped component one and fork-shaped component two are folded together and inserted into the cylinder through the flange pipe. Then, the fork-shaped component one is opened by the retraction module, so that fork-shaped component one is unfolded in an X shape and supported in the cylinder. When fork-shaped component one unfolds, it drives fork-shaped component two to unfold. The extension frame component is unfolded by the retraction module, which in turn drives fork-shaped component two to move forward, so that fork-shaped component two drives the welding torch to the welding position. The rotation module drives fork-shaped component one and fork-shaped component two to revolve, which in turn drives the welding torch to move in a ring, so as to realize the welding of the circumferential seam inside the cylinder. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the probe welding device structure in this invention;

[0028] Figure 2 This is a schematic diagram of the deployed state of the probe welding device in this invention;

[0029] Figure 3 This is a schematic diagram of the fork-shaped component in this invention;

[0030] Figure 4 This is a schematic diagram of the fork-shaped component's convergence structure in this invention;

[0031] Figure 5 This is a schematic diagram of the extension frame assembly structure in this invention;

[0032] Figure 6 This is a schematic diagram of the internal structure of the ring sleeve in this invention;

[0033] Figure 7 This is a schematic diagram of the internal structure of the main sleeve in this invention;

[0034] Figure 8 This is a schematic diagram of the pull-out module structure in this invention;

[0035] Figure 9 This is a schematic diagram of the retractable module structure in this invention;

[0036] Figure 10 This is a schematic diagram of the limiting frame assembly structure in this invention.

[0037] In the diagram: 100, Main sleeve; 101, Sleeve; 110, Ring; 111, Long groove one; 112, Long groove two; 120, Tensioning module; 121, Screw; 122, Internally threaded tube; 123, Support rod; 124, Bevel gear one; 125, Drive rod one; 126, Bevel gear two; 127, Core tube; 128, Bevel gear three; 130, Tensioning module; 131, Cage; 132, Guide wheel; 133, Slide; 134, Slip ring; 135, Connecting frame; 136, Externally threaded tube; 137, Bevel gear four; 13 8. Fixing plate; 139. Drive rod two; 140. Rotating module; 141. Drive rod three; 142. Conical tooth ring; 200. Fork-shaped assembly one; 210. Main cross rod one; 220. Main cross rod two; 300. Fork-shaped assembly two; 310. Collar; 320. Secondary cross rod one; 330. Secondary cross rod two; 400. Limiting frame assembly; 500. Extension frame assembly; 510. Guide rail; 520. X-shaped telescopic frame; 521. Slide; 530. Cable; 540. Compression rod; 550. Return spring; 600. Welding torch. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 7 In this embodiment of the invention, a welding process for the inner cylinder of a high-level liquid storage tank specifically includes the following steps:

[0040] Step 1: First, weld the longitudinal seam of the ring belt. When welding the seam, follow the steps of external tack welding, internal welding, external weld cleaning and grinding, and external welding.

[0041] Step 2: Align multiple rings and weld the circumferential seams, following the order from inside to outside, to form a cylinder;

[0042] Step 3: Weld an end cap to one end of the cylinder and weld both the inner and outer sides of the circumferential seam;

[0043] Step 4: Open a window on the cylinder and weld a flange pipe onto the window;

[0044] Step 5: Align the other end cap with the other end of the cylinder, perform a tack weld on the outside of the circumferential seam, and then insert a welding probe into the cylinder through the flange pipe to weld the inside of the circumferential seam at the other end of the cylinder. Then, re-weld the outside of the circumferential seam at the other end of the cylinder to form the tank.

[0045] A liquid high-level storage tank includes a tank structure, which is welded from a cylindrical body and two end caps, and the inner and outer sides of the circumferential seam between the cylindrical body and the end caps are welded together.

[0046] The insertion welding device includes a main sleeve 100, a fork-shaped assembly 200, a fork-shaped assembly 300, and a welding torch 600. One end of the main sleeve 100 is rotatably fitted with a ring sleeve 110. A sleeve 101 is fixedly connected to the outer wall of the main sleeve 100. A rotating module 140 is installed between the sleeve 101 and the ring sleeve 110, and the rotating module 140 is used to drive the ring sleeve 110 to rotate. The fork-shaped assembly 200 includes a main cross rod 210 and a main cross rod 220. The main cross rods 210 and 220 are rotatably connected to the ring sleeve 110. The main cross rod 210 is rotatably connected to the main cross rod 220. The two rods 220 are arranged in a cross pattern. A retraction module 120 is installed on the ring 110. The retraction module 120 is used to control the retraction and extension of the fork-shaped component 200. The fork-shaped component 300 is installed on one side of the fork-shaped component 200. Two extension frame assemblies 500 are installed between the fork-shaped component 300 and the fork-shaped component 200. A retraction module 130 is installed inside the ring 110. The retraction module 130 is used to control the extension and retraction of the extension frame assembly 500. The fork-shaped component 300 can be unfolded, moved forward and rotated as a whole. The welding torch 600 is fixedly installed on the fork-shaped component 300.

[0047] In this embodiment, initially, fork-shaped component 200 and fork-shaped component 300 are folded together and inserted into the cylinder through the flange pipe. Then, the fork-shaped component 200 is opened by the retracting module 120, so that the fork-shaped component 200 is unfolded in an X shape and supported in the cylinder. When the fork-shaped component 200 unfolds, it also unfolds the fork-shaped component 300. The extension frame assembly 500 is unfolded by the retracting module 130, thereby moving the fork-shaped component 300 forward. This causes the fork-shaped component 300 to move the welding torch 600 to the welding position. The fork-shaped component 200 and fork-shaped component 300 revolve by the rotation module 140, thereby causing the welding torch 600 to move in a ring, thus realizing the welding of the circumferential seam inside the cylinder.

[0048] Example 1

[0049] like Figures 4-9As shown, in this embodiment, the tensioning module 120 includes a core tube 127 and a drive rod 125. The drive rod 125 is installed inside the sleeve 101. An internally threaded tube 122 is rotatably connected between the inner walls of the annular sleeve 110. A screw 121 is screwed into the internal wall of the internally threaded tube 122. Two support rods 123 are rotatably connected to the bottom end of the screw 121. The main cross rod 1 210 and the main cross rod 220 are rotatably connected to one end of the support rod 123 on the adjacent side. A bevel gear 2 126 is fixedly installed at the bottom end of the drive rod 125. A bevel gear 124 is fixedly sleeved at the top end of the internally threaded tube 122. Two bevel gears 3 128 are fixedly installed on the core tube 127. The two bevel gears 3 128 mesh with bevel gears 2 126 and bevel gear 124 respectively. The rotating module 140 includes... Drive rod 3 141 is rotatably sleeved with the inner wall of sleeve 101. Drive rod 1 125 is rotatably installed inside drive rod 3 141. A beveled ring 142 is fixedly installed on the outer wall of one end of ring sleeve 110. The bottom end of drive rod 3 141 is connected to beveled ring 142 in a transmission connection. The lengths of main cross rod 1 210 and main cross rod 2 220 are adjustable. Both ends of main cross rod 2 220 are equipped with rotating wheels. Fork assembly 2 300 includes collar 310. Secondary cross rod 1 320 and secondary cross rod 2 330 are rotatably connected to collar 310. The lengths of secondary cross rod 1 320 and secondary cross rod 2 330 are adjustable. Both ends of secondary cross rod 1 320 and secondary cross rod 2 330 are equipped with ball bearings. Welding torch 600 is installed at one end of secondary cross rod 2 330.

[0050] In this embodiment, drive rod 125 drives core tube 127 to rotate, core tube 127 drives internal thread tube 122 to rotate, internal thread tube 122 drives screw 121 to move along internal thread tube 122, screw 121 drives main cross rod 1 210 and main cross rod 220 to unfold and retract through support rod 123, thereby controlling the unfolding of fork assembly 1 200. Drive rod 3 141 is manually rotated, drive rod 3 141 drives ring sleeve 110 to rotate through bevel ring 142, ring sleeve 110 The fork-shaped component 200 is driven to revolve, thereby controlling the overall rotation of fork-shaped component 200 and fork-shaped component 300. By adjusting the length of the main cross rod 210 and the main cross rod 220, the lengths of the main cross rod 210 and the main cross rod 220 are adjusted in advance according to the inner diameter of the cylinder before fork-shaped component 200 and fork-shaped component 300 are inserted into the cylinder, so that the four apex corners of fork-shaped component 200 and fork-shaped component 300 can be supported by the inside of the cylinder after unfolding.

[0051] Example 2

[0052] like Figures 5-10As shown, in this embodiment, the extension frame assembly 500 is installed between the main crossbar 210 and the secondary crossbar 320. The extension frame assembly 500 includes two guide rails 510, and an X-shaped telescopic frame 520 is installed between the two guide rails 510. Both ends of the X-shaped telescopic frame 520 are provided with a fixed end and a movable end. The fixed end is fixed to the guide rail 510, and a slide block 521 is rotatably connected to the movable end. The slide block 521 is slidably connected to the guide rail 510, and a pull cable 530 is fixedly connected to one slide block 521. The retraction module 130 is used to retract the pull cable 530. The main crossbar 210 and the secondary crossbar 320 are... The retractable module 130 is not fixedly connected to the adjacent guide rail 510. It includes a retainer 131 and an externally threaded tube 136. The retainer 131 is rotatably mounted inside the ring 110. Two long slots 111 are formed on the inner wall of the other end of the ring 110, and two long slots 112 are formed in the middle of the ring 110. The retainer 131 is fixedly connected to the main cross rod 210 via the long slots 112. Two guide wheels 132 are rotatably connected to one end of the retainer 131, and a slide 133 is slidably connected to the other end of the retainer 131. A slip ring 134 is rotatably connected to one side of the slide 133. One end of the externally threaded tube 136... The end of the sleeve 136 is rotatably connected to the main sleeve 100. A connecting bracket 135 is screwed onto the external threaded tube 136. The connecting bracket 135 is fixedly installed between the slip rings 134 and the main sleeve 100. One end of the cable 530 passes over the guide wheel 132 and is fixedly installed between the cable and the slide 133. The other end of the main sleeve 100 is rotatably connected to the drive rod 139. One end of the external threaded tube 136 is fixedly sleeved with a bevel gear 137. The bottom end of the drive rod 125 is connected to the external threaded tube 136 through the bevel gear 137. The core tube 127 is rotatably sleeved on the inside of the external threaded tube 136. The bottom ends of the drive rod 125 and the drive rod 139 are connected to the main sleeve 100. A fixed plate 138 is rotatably connected between the connecting frame 135 and the fixed plate 138. Two pairs of compression rods 540 are provided between the two ends of the main cross rod 220 and the secondary cross rod 330, and one end of the two compression rods 540 in the same pair is rotatably connected. The main cross rod 220 and the secondary cross rod 330 are rotatably connected to the other end of the compression rod 540 on the adjacent side, and a return spring 550 is fixedly connected between the two compression rods 540 in the same pair. A limit frame assembly 400 is installed at one end of the sleeve 101. The limit frame assembly 400 is used to clamp the flange pipe and limit the sleeve 101.

[0053] In specific implementation, the pull module 130 pulls the cable 530, which in turn drives the slide block 521 to slide on the guide rail 510, thereby controlling the extension of the X-shaped telescopic frame 520 and causing the fork-shaped component 2 300 to move forward. When the X-shaped telescopic frame 520 is released, the return spring 550 and the compression rod 540 are used. When the return spring 550 contracts, it drives the fork-shaped component 2 300 to move towards the fork-shaped component 1 200 through the compression rod 540, thus retracting the fork-shaped component 2 300. When the cable 530 is pulled in and out, the drive rod 2 139 is manually rotated. The drive rod 2 139 drives the external threaded tube 136 to rotate through the bevel gear 4 137. The fixing plate 138 restricts the connecting frame 135 to prevent it from rotating. Thus, when the external threaded tube 136 rotates, it drives the connecting frame 135 to move back and forth. When the connecting frame 135 moves backward, it pulls the slide block 133 backward. When the slide block 133 moves backward, it pulls the cable 2 130 to move forward. Cable 530, through the setting of long groove 111 and long groove 112, facilitates the deflection of the main cross rod 210 relative to the ring 110, and when the main cross rod 210 rotates relative to the ring 110, it drives the retainer 131 to rotate synchronously. Through the sliding connection between the slide 133 and the retainer 131, it facilitates the synchronous rotation between the slide 133 and the retainer 131, and facilitates the pulling of cable 530 through the slide 133. Through the rotational connection between the slip ring 134 and the slide 133, it facilitates the retainer 131 to rotate with the overall rotation of the fork assembly 200, thereby avoiding the main cross rod 210 and the fork assembly 200 from affecting the extension of the extension frame assembly 500 when they rotate, and facilitating the stabilization of the front and rear position of the fork assembly 200 when it rotates. Through the setting of the limiting frame assembly 400, the position of the sleeve 101 is fixed, and the accidental movement of the sleeve 101 after the fork assembly 200 moves into place does not affect the fork assembly 200.

[0054] In this invention, to facilitate operator control, lighting modules and monitoring modules can be installed at other apex positions on the fork-shaped component 300 to monitor the inside of the cylinder during welding. The lighting modules and monitoring modules are existing technologies and will not be described in detail here.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A welding process for the inner cylinder of a high-level liquid storage tank, characterized in that, The welding process specifically includes the following steps: Step 1: First, weld the longitudinal seam of the ring belt. When welding the seam, follow the steps of external tack welding, internal welding, external weld cleaning and grinding, and external welding. Step 2: Align multiple rings and weld the circumferential seams, following the order from inside to outside, to form a cylinder; Step 3: Weld an end cap to one end of the cylinder and weld both the inner and outer sides of the circumferential seam; Step 4: Open a window on the cylinder and weld a flange pipe onto the window; Step 5: Align the other end cap with the other end of the cylinder, perform a tack weld on the outside of the circumferential seam, and then insert a welding probe into the cylinder through the flange pipe to weld the inside of the circumferential seam at the other end of the cylinder. Then re-weld the outside of the circumferential seam at the other end of the cylinder to form the tank. The penetration welding device includes: A main sleeve (100) has a ring sleeve (110) rotatably fitted at one end. A sleeve (101) is fixedly connected to the outer wall of the main sleeve (100). A rotating module (140) is installed between the sleeve (101) and the ring sleeve (110). The rotating module (140) is used to drive the ring sleeve (110) to rotate. A fork-shaped component one (200) includes a main cross rod one (210) and a main cross rod two (220), which are rotatably connected to a ring sleeve (110). The main cross rod one (210) and the main cross rod two (220) are arranged crosswise. A retraction module (120) is installed on the ring sleeve (110), which is used to control the retraction and expansion of the fork-shaped component one (200). Fork-shaped component two (300) is installed on one side of fork-shaped component one (200). Two extension frame assemblies (500) are installed between fork-shaped component two (300) and fork-shaped component one (200). A retractable module (130) is installed inside the ring (110). The retractable module (130) is used to control the extension and retraction of the extension frame assembly (500). Fork-shaped component two (300) can be unfolded, moved forward and rotated as a whole. The welding torch (600) is fixedly mounted on the fork-shaped assembly two (300); The retracting module (120) includes a core tube (127) and a drive rod (125). The drive rod (125) is installed inside the sleeve (101). An internally threaded tube (122) is rotatably connected between the inner walls of the ring sleeve (110). A screw (121) is screwed into the inside of the internally threaded tube (122). Two support rods (123) are rotatably connected to the bottom end of the screw (121). The main cross rod (210) and the main... The cross rods (220) are rotatably connected to one end of the adjacent support rod (123). The bottom end of the drive rod (125) is fixedly installed with a bevel gear (126). The top end of the internal threaded tube (122) is fixedly sleeved with a bevel gear (124). Two bevel gears (128) are fixedly installed on the core tube (127). The two bevel gears (128) mesh with the bevel gears (126) and the bevel gears (124) respectively.

2. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 1, characterized in that, The rotating module (140) includes a third drive rod (141), which is rotatably sleeved with the inner wall of the sleeve (101). A first drive rod (125) is rotatably installed inside the third drive rod (141). A beveled ring (142) is fixedly installed on the outer wall of one end of the ring sleeve (110). The bottom end of the third drive rod (141) is connected to the beveled ring (142) in a transmission connection.

3. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 2, characterized in that, The lengths of the first main crossbar (210) and the second main crossbar (220) are adjustable. Both ends of the second main crossbar (220) are equipped with rotating wheels. The second fork-shaped component (300) includes a collar (310). The first secondary crossbar (320) and the second secondary crossbar (330) are rotatably connected to the collar (310). The lengths of the first secondary crossbar (320) and the second secondary crossbar (330) are adjustable. Both ends of the first secondary crossbar (320) and the second secondary crossbar (330) are equipped with ball bearings. The welding torch (600) is installed at one end of the second secondary crossbar (330).

4. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 3, characterized in that, The extension frame assembly (500) is installed between the main crossbar (210) and the secondary crossbar (320). The extension frame assembly (500) includes two guide rails (510). An X-shaped telescopic frame (520) is installed between the two guide rails (510). Both ends of the X-shaped telescopic frame (520) are provided with a fixed end and a movable end. The fixed end is fixed to the guide rail (510). A slide (521) is rotatably connected to the movable end. The slide (521) is slidably connected to the guide rail (510). A cable (530) is fixedly connected to one slide (521). The retraction module (130) is used to retract the cable (530). The main crossbar (210) and the secondary crossbar (320) are respectively fixedly connected to the adjacent guide rail (510).

5. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 4, characterized in that, The retractable module (130) includes a retainer (131) and an externally threaded tube (136). The retainer (131) is rotatably mounted on the inner side of the ring (110). Two long grooves (111) are formed on the inner sidewall of the other end of the ring (110), and two long grooves (112) are formed in the middle of the ring (110). The retainer (131) is fixedly connected to the main cross rod (210) through the long grooves (112). Two guide wheels (132) are rotatably connected to one end of the retainer (131), and a slide (133) is slidably connected to the other end of the retainer (131). A slip ring (134) is rotatably connected to one side of the slide (133). One end of the externally threaded tube (136) is rotatably connected to the main sleeve (100). The external threaded tube (136) is screwed onto a connecting frame (135), which is fixedly installed between the connecting frame (135) and the slip ring (134). One end of the cable (530) passes over the guide wheel (132) and is fixedly installed between the cable and the slide (133). The other end of the main sleeve (100) is rotatably connected to a second drive rod (139). One end of the external threaded tube (136) is fixedly sleeved with a fourth bevel gear (137). The bottom end of the second drive rod (139) is connected to the external threaded tube (136) through the fourth bevel gear (137). A fixed plate (138) is rotatably connected between the bottom ends of the first drive rod (125) and the second drive rod (139). The connecting frame (135) and the fixed plate (138) are slidably connected.

6. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 5, characterized in that, Two pairs of compression rods (540) are provided between the two ends of the main cross rod 2 (220) and the secondary cross rod 2 (330), and one end of the two compression rods (540) in the same pair is rotatably connected. The main cross rod 2 (220) and the secondary cross rod 2 (330) are respectively rotatably connected to the other end of the compression rod (540) on the adjacent side, and a return spring (550) is fixedly connected between the two compression rods (540) in the same pair.

7. The welding process for the inner cylinder of a high-level liquid storage tank according to claim 1, characterized in that, One end of the sleeve (101) is equipped with a limiting bracket assembly (400), which is used to engage with the flange pipe and limit the sleeve (101).

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