Welding process for inner cylinder of liquid high-level storage tank and storage tank

Abstract

The invention relates to the technical field of high-position storage tank welding, in particular to a liquid high-position storage tank inner barrel welding process and a storage tank. The liquid high-position storage tank inner barrel welding process comprises a probing welding device, the probing welding device comprises a main sleeve, a first fork-shaped assembly, a second fork-shaped assembly and a welding gun, one end of the main sleeve is rotationally sleeved with a ring sleeve, and the outer side wall of the main sleeve is fixedly connected with a sleeve; a rotating module is installed between the sleeve and the ring sleeve and used for driving the ring sleeve to rotate, the first fork-shaped assembly comprises a first main cross rod and a second main cross rod, the first main cross rod and the second main cross rod are rotationally connected with the ring sleeve, the first main cross rod and the second main cross rod are arranged in a cross mode, and a folding and unfolding module is installed on the ring sleeve. According to the welding device, through the arrangement of the probing welding device, probing into the cylinder from the window in the side wall of the tank body is achieved, so that the inner side of the last circular seam is welded, the inner sides and the outer sides of all the circular seams on the tank body are welded, the welding effect is improved, and the pressure bearing length of the tank body is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of high-level storage tank welding, and specifically to a welding process for the inner cylinder of a liquid high-level storage tank and the storage tank. Background Art

[0002] The high-level storage tank can also be called an expansion tank. In the liquid-phase heat-conducting oil furnace heating system, the setting of the expansion tank is essential. The high-level tank is usually set at the highest point of the system. Therefore, in addition to accommodating the thermal expansion of the heat-conducting liquid, it also has other important functions, such as the evacuation of light components in newly filled products and low-boiling substances generated during operation, the replenishment of evaporation and operation losses, and nitrogen sealing. Its working environment requires the high-level storage tank to have the characteristics of high temperature resistance, pressure resistance, and corrosion resistance. The tank body is relatively large. During welding, the tank body is generally formed by welding a cylinder and two end covers. Due to the relatively thick plate, when welding the circumferential seam and longitudinal seam, it is generally necessary to weld from the inside to the outside in sequence. When welding the inner side of the circumferential seam before, production personnel could enter the inside of the cylinder for welding. However, when welding the last end cover to the cylinder and it is difficult for personnel to enter through the window on the cylinder, it will cause difficulties in welding the inner side of the last circumferential seam of the tank body main body, affecting the overall strength of the tank body. Summary of the Invention

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

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

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

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

[0007] Step 2: Align multiple ring belts and weld the circumferential seam in the order from the inside to the outside to form a cylinder;

[0008] Step 3: Weld one end cover 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 on the window;

[0010] Step 5: Align the other end cover with the other end of the cylinder. After performing tack welding on the outside of the circumferential seam, insert a welding device through the flange pipe into the cylinder to weld the inner side of the circumferential seam at the other end of the cylinder. Subsequently, re-weld the outside of the circumferential seam at the other end of the cylinder to form a tank body.

[0011] Furthermore: The inserted welding device includes:

[0012] The main sleeve has a ring sleeve rotatably sleeved at one end. A sleeve is fixedly connected to the outer side wall of the main sleeve. A rotation module is installed between the sleeve and the ring sleeve, and the rotation module is used to drive the ring sleeve to rotate;

[0013] The first fork-shaped component includes a first main cross bar and a second main cross bar. The first main cross bar and the second main cross bar are rotatably connected to the ring sleeve. The first main cross bar and the second main cross bar are arranged crosswise. A contraction and expansion module is installed on the ring sleeve, and the contraction and expansion module is used to control the contraction and expansion of the first fork-shaped component;

[0014] The second fork-shaped component is installed on one side of the first fork-shaped component on one side. Two extension frame components are installed between the second fork-shaped component and the first fork-shaped component. A retraction and tension module is installed in the ring sleeve, and the retraction and tension module is used to control the telescoping of the extension frame components. The second fork-shaped component can be unfolded, moved forward and rotated as a whole;

[0015] The welding torch is fixedly installed on the second fork-shaped component.

[0016] Furthermore: The contraction and expansion module includes a core tube and a first driving rod. The first driving rod is installed in the sleeve. An internally threaded tube is rotatably connected between the inner walls of the ring sleeve. A screw rod is screwed inside the internally threaded tube. The bottom end of the screw rod is rotatably connected to two support rods. The first main cross bar and the second main cross bar are both rotatably connected to one end of the adjacent support rod. A second bevel gear is fixedly installed at the bottom end of the first driving rod. A first bevel gear is fixedly sleeved at the top end of the internally threaded tube. Two third bevel gears are fixedly installed on the core tube, and the two third bevel gears are respectively meshed with the second bevel gear and the first bevel gear.

[0017] Furthermore: The rotation module includes a third driving rod. The third driving rod is rotatably sleeved between the inner wall of the sleeve. The first driving rod is rotatably installed inside the third driving rod. A bevel gear ring is fixedly installed on the outer side wall of one end of the ring sleeve. The bottom end of the third driving rod is in transmission connection with the bevel gear ring.

[0018] Furthermore: The lengths of the first main cross bar and the second main cross bar are adjustable. Wheels are installed at both ends of the second main cross bar. The second fork-shaped component includes a collar. A first secondary cross bar and a second secondary cross bar are rotatably connected to the collar. The lengths of the first secondary cross bar and the second secondary cross bar are adjustable. Balls are installed at both ends of the first secondary cross bar and the second secondary cross bar. The welding torch is installed at one end of the second secondary cross bar.

[0019] Furthermore, the extension frame assembly is installed between the first main cross bar and the first auxiliary cross bar. The extension frame assembly includes two guide rails. An X-shaped telescopic frame is installed between the two guide rails. Both ends of the X-shaped telescopic frame are provided with fixed ends and movable ends. The fixed ends are fixed to the guide rails. A sliding seat is rotatably connected to the movable end. The sliding seat is slidably connected to the guide rail. A cable is fixedly connected to one sliding seat. The cable pulling module is used for pulling the cable. The first main cross bar and the first auxiliary cross bar are respectively fixedly connected to the adjacent guide rails.

[0020] Furthermore, the cable pulling module includes a retaining frame and an externally threaded tube. The retaining frame is rotatably installed inside the collar. Two first long grooves are formed in the inner side wall of the other end of the collar. Two second long grooves are formed in the middle position of the collar. The retaining frame is fixedly connected to the first main cross bar through the second long grooves. Two guide wheels are rotatably connected to one end of the retaining frame. A sliding frame is slidably connected to the other end of the retaining frame. A sliding ring is rotatably connected to one side of the sliding frame. 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 with the sliding ring. One end of the cable bypasses the guide wheel and is fixedly installed with the sliding frame. A second driving rod is rotatably connected to the other end of the main sleeve. A fourth bevel gear is fixedly sleeved on one end of the externally threaded tube. The bottom end of the second driving rod is in transmission connection with the externally threaded tube through the fourth bevel gear. A fixing plate is rotatably connected between the bottom ends of the first driving rod and the second driving rod. The connecting frame is slidably connected to the fixing plate.

[0021] Furthermore, two pairs of compression rods are arranged between the two ends of the second main cross bar and the second auxiliary cross bar. One ends of the two compression rods in the same pair are rotatably connected. The second main cross bar and the second auxiliary cross bar are respectively rotatably connected to the other ends of the adjacent compression rods. A return spring is fixedly connected between the two compression rods in the same pair.

[0022] Furthermore, a limiting frame assembly is installed at one end of the sleeve. The limiting frame assembly is used for clamping with the flange pipe and limiting the sleeve.

[0023] A liquid high-level storage tank includes a tank body structure. The tank body structure is welded by a cylinder and two end covers. Welding is formed on both the inner and outer sides of the circumferential seam between the cylinder and the end cover.

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

[0025] 1. Through the setting of the penetration welding device, it is realized to penetrate into the cylinder from the window on the side wall of the tank body, so as to weld the inner side of the last circumferential seam, so that all the inner and outer sides of the circumferential seams on the tank body main body are welded, thereby improving the welding effect and increasing the pressure-bearing length of the tank body;

[0026] 2. Through the settings of the first fork-shaped component and the second fork-shaped component, initially, the first fork-shaped component and the second fork-shaped component are folded and retracted, and they are inserted into the cylinder from the flange pipe. Subsequently, the first fork-shaped component is driven to open by the expansion and contraction module, so that the first fork-shaped component is unfolded in an X shape and supported inside the cylinder. When the first fork-shaped component unfolds, it drives the second fork-shaped component to unfold. The extension frame component is driven to unfold by the pulling module, thereby driving the second fork-shaped component to move forward, so that the second fork-shaped component drives the welding torch to move to the welding position. The first fork-shaped component and the second fork-shaped component are driven to revolve by the rotation module, thereby driving the welding torch to move in a circular motion to realize the welding of the circumferential seam inside the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the insertion welding device in the present invention;

[0028] Figure 2 is a schematic structural diagram of the insertion welding device in the unfolded state in the present invention;

[0029] Figure 3 is a schematic structural diagram of the first fork-shaped component in the present invention;

[0030] Figure 4 is a schematic structural diagram of the first fork-shaped component in the folded state in the present invention;

[0031] Figure 5 is a schematic structural diagram of the extension frame component in the present invention;

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

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

[0034] Figure 8 is a schematic structural diagram of the pulling module in the present invention;

[0035] Figure 9 is a schematic structural diagram of the expansion and contraction module in the present invention;

[0036] Figure 10 is a schematic structural diagram of the limit frame component in the present invention.

[0037] In the figure: 100, main sleeve; 101, casing; 110, collar; 111, first long groove; 112, second long groove; 120, expansion and contraction module; 121, screw rod; 122, internally threaded pipe; 123, support rod; 124, first bevel gear; 125, first drive rod; 126, second bevel gear; 127, core pipe; 128, third bevel gear; 130, retraction and tension module; 131, cage; 132, guide wheel; 133, sliding carriage; 134, slip ring; 135, connecting frame; 136, externally threaded pipe; 137, fourth bevel gear; 138, fixing plate; 139, second drive rod; 140, rotation module; 141, third drive rod; 142, bevel gear ring; 200, first fork-shaped assembly; 210, first main cross bar; 220, second main cross bar; 300, second fork-shaped assembly; 310, collar; 320, first secondary cross bar; 330, second secondary cross bar; 400, limit frame assembly; 500, extension frame assembly; 510, guide rail; 520, X-shaped telescopic frame; 521, sliding seat; 530, cable; 540, compression rod; 550, return spring; 600, welding torch. Detailed implementation manner

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

[0040] Step 1: First, weld the longitudinal seam of the annular belt. When welding the weld seam, perform outside positioning welding, inside welding, outside weld seam cleaning and grinding, and outside welding in sequence.

[0041] Step 2: Align multiple annular belts and weld the circumferential seam in the order of inside first and then outside to form a cylinder body.

[0042] Step 3: Weld one end cover to one end of the cylinder body and weld both the inside and outside of the circumferential seam.

[0043] Step 4: Open a window on the cylinder body and weld an upper flange pipe on the window.

[0044] Step 5: Align the other end cover with the other end of the cylinder body. After performing positioning welding on the outside of the circumferential seam, insert the welding device through the flange pipe into the cylinder body to weld the inside of the circumferential seam at the other end of the cylinder body. Subsequently, re-weld the outside of the circumferential seam at the other end of the cylinder body to form a tank body.

[0045] A high-level liquid storage tank includes a tank body structure, which is welded by a cylinder body and two end covers, and the inner and outer sides of the circumferential seam between the cylinder body and the end cover are both welded and formed.

[0046] The penetration welding device includes a main sleeve 100, a first fork-shaped component 200, a second fork-shaped component 300 and a welding torch 600. A ring sleeve 110 is rotatably sleeved at one end of the main sleeve 100. A sleeve 101 is fixedly connected to the outer side wall of the main sleeve 100. A rotation module 140 is installed between the sleeve 101 and the ring sleeve 110. The rotation module 140 is used to drive the ring sleeve 110 to rotate. The first fork-shaped component 200 includes a main cross bar one 210 and a main cross bar two 220. The main cross bar one 210 and the main cross bar two 220 are rotatably connected to the ring sleeve 110. The main cross bar one 210 and the main cross bar two 220 are arranged crosswise. A contraction and expansion module 120 is installed on the ring sleeve 110. The contraction and expansion module 120 is used to control the contraction and expansion of the first fork-shaped component 200. The second fork-shaped component 300 is installed on one side of the first fork-shaped component 200. Two extension frame components 500 are installed between the second fork-shaped component 300 and the first fork-shaped component 200. A retraction and tension module 130 is installed inside the ring sleeve 110. The retraction and tension module 130 is used to control the telescopic movement of the extension frame components 500. The second fork-shaped component 300 can be unfolded, moved forward and rotated as a whole. The welding torch 600 is fixedly installed on the second fork-shaped component 300.

[0047] In this embodiment, initially, the first fork-shaped component 200 and the second fork-shaped component 300 are folded and retracted. The first fork-shaped component 200 and the second fork-shaped component 300 are inserted into the cylinder body from the flange pipe. Subsequently, the contraction and expansion module 120 drives the first fork-shaped component 200 to expand, so that the first fork-shaped component 200 is unfolded in an X shape and supported inside the cylinder body. When the first fork-shaped component 200 unfolds, it drives the second fork-shaped component 300 to unfold. The retraction and tension module 130 drives the extension frame components 500 to unfold, thereby driving the second fork-shaped component 300 to move forward, so that the second fork-shaped component 300 drives the welding torch 600 to move to the welding position. The rotation module 140 drives the first fork-shaped component 200 and the second fork-shaped component 300 to revolve, thereby driving the welding torch 600 to move in a circle, realizing the welding of the circumferential seam inside the cylinder body.

[0048] Embodiment 1

[0049] As Figures 4 to 9As shown, in this embodiment, the expansion and contraction module 120 includes a core tube 127 and a first driving rod 125. The first driving rod 125 is installed inside the sleeve 101. An internally threaded tube 122 is rotatably connected between the inner walls of the collar 110. A screw rod 121 is threadedly engaged inside the internally threaded tube 122. The bottom end of the screw rod 121 is rotatably connected to two support rods 123. The first main cross rod 210 and the second main cross rod 220 are both rotatably connected to one end of the adjacent support rod 123. The bottom end of the first driving rod 125 is fixedly installed with a second bevel gear 126. The top end of the internally threaded tube 122 is fixedly sleeved with a first bevel gear 124. Two third bevel gears 128 are fixedly installed on the core tube 127. The two third bevel gears 128 are respectively meshed with the second bevel gear 126 and the first bevel gear 124. The rotation module 140 includes a third driving rod 141. The third driving rod 141 is rotatably sleeved between the inner wall of the sleeve 101. The first driving rod 125 is rotatably installed inside the third driving rod 141. A bevel gear ring 142 is fixedly installed on the outer side wall of one end of the collar 110. The bottom end of the third driving rod 141 is drivingly connected to the bevel gear ring 142. The lengths of the first main cross rod 210 and the second main cross rod 220 are adjustable. Wheels are installed at both ends of the second main cross rod 220. The fork-shaped assembly two 300 includes a collar 310. A first secondary cross rod 320 and a second secondary cross rod 330 are rotatably connected to the collar 310. The lengths of the first secondary cross rod 320 and the second secondary cross rod 330 are adjustable. Balls are installed at both ends of the first secondary cross rod 320 and the second secondary cross rod 330. The welding torch 600 is installed at one end of the second secondary cross rod 330.

[0050] In this embodiment, the first driving rod 125 drives the core tube 127 to rotate. The core tube 127 drives the internally threaded tube 122 to rotate. The internally threaded tube 122 drives the screw rod 121 to move along the internally threaded tube 122. The screw rod 121 drives the first main cross rod 210 and the second main cross rod 220 to expand and contract through the support rods 123, realizing the control of the expansion of the fork-shaped assembly one 200. Manually rotate the third driving rod 141. The third driving rod 141 drives the collar 110 to rotate through the bevel gear ring 142. The collar 110 drives the fork-shaped assembly one 200 to revolve, realizing the control of the overall rotation of the fork-shaped assembly one 200 and the fork-shaped assembly two 300. Through the adjustable lengths of the first main cross rod 210 and the second main cross rod 220, before the fork-shaped assembly one 200 and the fork-shaped assembly two 300 penetrate into the cylinder body, the lengths of the first main cross rod 210 and the second main cross rod 220 are adjusted in advance according to the inner diameter of the cylinder body, so that all four top corners of the fork-shaped assembly one 200 and the fork-shaped assembly two 300 can support against the inside of the cylinder body after expansion.

[0051] Embodiment Two

[0052] As Figures 5 to 10As shown, in this embodiment, the extension frame assembly 500 is installed between the main cross bar 210 and the auxiliary cross bar 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 fixed ends and movable ends. The fixed ends are fixed to the guide rails 510. A sliding seat 521 is rotatably connected to the movable end. The sliding seat 521 is slidably connected to the guide rail 510. A cable 530 is fixedly connected to one sliding seat 521. The cable retracting module 130 is used to retract the cable 530. The main cross bar 210 and the auxiliary cross bar 320 are respectively fixedly connected to the adjacent guide rails 510. The cable retracting module 130 includes a retaining frame 131 and an external thread tube 136. The retaining frame 131 is rotatably installed inside the collar 110. Two first long grooves 111 are formed in the inner side wall of the other end of the collar 110. Two second long grooves 112 are formed in the middle position of the collar 110. The retaining frame 131 is fixedly connected to the main cross bar 210 through the second long grooves 112. Two guide wheels 132 are rotatably connected to one end of the retaining frame 131. A sliding frame 133 is slidably connected to the other end of the retaining frame 131. A sliding ring 134 is rotatably connected to one side of the sliding frame 133. One end of the external thread tube 136 is rotatably connected to the main sleeve 100. A connecting frame 135 is screwed onto the external thread tube 136. The connecting frame 135 is fixedly installed with the sliding ring 134. One end of the cable 530 is fixed to the sliding frame 133 after passing around the guide wheel 132. A second drive rod 139 is rotatably connected to the other end of the main sleeve 100. A fourth bevel gear 137 is fixedly sleeved on one end of the external thread tube 136. The bottom end of the second drive rod 139 is in transmission connection with the external thread tube 136 through the fourth bevel gear 137. The core tube 127 is rotatably sleeved inside the external thread tube 136. A fixing 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 is slidably connected to the fixing plate 138. Two pairs of compression rods 540 are arranged between the two ends of the main cross bar 220 and the auxiliary cross bar 330. One ends of the two compression rods 540 in the same pair are rotatably connected. The main cross bar 220 and the auxiliary cross bar 330 are respectively rotatably connected to the other ends of the adjacent compression rods 540. A return spring 550 is fixedly connected between the two compression rods 540 in the same pair. A limiting frame assembly 400 is installed at one end of the sleeve 101. The limiting frame assembly 400 is used to be clamped with the flange tube and limit the sleeve 101.

[0053] During specific implementation, the cable 530 is pulled by the retracting and pulling module 130. The cable 530 drives the sliding seat 521 to slide on the guide rail 510, thereby controlling the extension of the X-shaped telescopic frame 520 and driving the fork-shaped component two 300 to move forward. When the X-shaped telescopic frame 520 is released, due to the arrangement of the return spring 550 and the compression rod 540, when the return spring 550 contracts, it drives the fork-shaped component two 300 to move towards the fork-shaped component one 200 through the compression rod 540, realizing the recycling of the fork-shaped component two 300. When retracting and releasing the cable 530, the driving rod two 139 is manually rotated. The driving rod two 139 drives the external thread tube 136 to rotate through the bevel gear four 137. Due to the restriction of the connecting frame 135 by the fixing plate 138, the connecting frame 135 is prevented from rotating. Thus, when the external thread tube 136 rotates, it drives the connecting frame 135 to move back and forth. When the connecting frame 135 moves backward, it pulls the carriage 133 to move backward. When the carriage 133 moves backward, it pulls the cable 530. Due to the arrangement of the first elongated slot 111 and the second elongated slot 112, it is convenient for the first main cross bar 210 to deflect relative to the collar 110. And when the first main cross bar 210 rotates relative to the collar 110, it drives the cage 131 to rotate synchronously. Due to the sliding connection between the carriage 133 and the cage 131, it is convenient for synchronous rotation between the carriage 133 and the cage 131, and it is convenient to pull the cable 530 through the carriage 133. Due to the rotational connection between the slip ring 134 and the carriage 133, it is convenient for the cage 131 to rotate following the overall rotation of the fork-shaped component one 200, thereby preventing the rotation of the first main cross bar 210 and the fork-shaped component one 200 from affecting the extension of the extension frame assembly 500, and facilitating the stabilization of the front and rear positions where the fork-shaped component two 300 rotates. Through the arrangement of the limiting frame assembly 400, the position of the sleeve 101 is fixed, preventing the accidental movement of the sleeve 101 after the fork-shaped component two 300 moves into place from affecting the fork-shaped component two 300.

[0054] In the present invention, for the convenience of the operator to control the present invention, a lighting module and a monitoring module can also be installed at other vertex positions on the fork-shaped component two 300, so as to monitor the inside of the cylinder during welding. The lighting module and the monitoring module are prior arts and will not be elaborated here.

[0055] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 liquid high-level 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 weld, follow the steps of outer tack welding, inner welding, outer weld cleaning and grinding, and outer welding; Step 2: Align multiple ring bands and weld the ring seams in the order of inside first and outside later to form a cylinder; Step 3: Weld an end cap to one end of the cylinder and weld the inner and outer sides of the annular seam; Step 4: Open a window on the cylinder and weld a flange pipe on the window; Step 5: Align the other end cover with the other end of the cylinder, perform positioning welding on the outside of the annular seam, and then extend the probe welding device from the flange pipe into the cylinder to weld the inside of the annular seam at the other end of the cylinder, and then re-weld the outside of the annular seam at the other end of the cylinder to form the tank body.

2. A liquid high-level storage tank inner cylinder welding process according to claim 1, characterized in that: The probe welding device comprises: A main sleeve (100) is rotatably sleeved at one end with a ring sleeve (110), an outer wall of the main sleeve (100) is fixedly connected with a sleeve (101), 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; A fork assembly (200) comprises a main cross rod (210) and a main cross rod (220), wherein the main cross rod (210) and the main cross rod (220) are rotatably connected to the ring sleeve (110), and the main cross rod (210) and the main cross rod (220) are cross-arranged, and a retracting module (120) is installed on the ring sleeve (110), and the retracting module (120) is used to control the retraction and extension of the fork assembly (200); A fork-shaped component 2 (300) is installed on one side of the fork-shaped component 1 (200), two extension frame components (500) are installed between the fork-shaped component 2 (300) and the fork-shaped component 1 (200), a retracting module (130) is installed in the ring sleeve (110), and the retracting module (130) is used to control the extension and retraction of the extension frame component (500), and the fork-shaped component 2 (300) can be unfolded, moved forward and rotated as a whole; The welding gun (600) is fixedly mounted on the second fork assembly (300).

3. A liquid high-level storage tank inner cylinder welding process according to claim 2, characterized in that: The retracting and expanding module (120) comprises a core tube (127) and a driving rod (125), wherein the driving rod (125) is installed in the sleeve (101), an internal threaded tube (122) is rotatably connected between the inner walls of the annular sleeve (110), a screw rod (121) is screwed inside the internal threaded tube (122), and the bottom end of the screw rod (121) is rotatably connected to two supporting rods (123), and the main cross rod (210) and the main cross rod (121) are connected to each other. The cross rods 2 (220) are rotatably connected to one end of the support rods (123) on the adjacent side; the bottom end of the driving rod 1 (125) is fixedly mounted with a bevel gear 2 (126); the top end of the internally threaded tube (122) is fixedly sleeved with a bevel gear 1 (124); and two bevel gears 3 (128) are fixedly mounted on the core tube (127); the two bevel gears 3 (128) are respectively meshed with the bevel gear 2 (126) and the bevel gear 1 (124).

4. A liquid high-level storage tank inner cylinder welding process according to claim 2, characterized in that: The rotating module (140) comprises a driving rod three (141), wherein the driving rod three (141) is rotatably sleeved with the inner wall of the sleeve (101), the driving rod one (125) is rotatably mounted inside the driving rod three (141), a bevel gear ring (142) is fixedly mounted on the outer wall of one end of the ring sleeve (110), and the bottom end of the driving rod three (141) is transmission-connected with the bevel gear ring (142).

5. A liquid high-level storage tank inner cylinder welding process according to claim 4, characterized in that: The lengths of the main cross rod 1 (210) and the main cross rod 2 (220) are adjustable, and rotating wheels are installed at both ends of the main cross rod 2 (220). The fork assembly 2 (300) includes a ring (310), and the ring (310) is rotatably connected to the secondary cross rod 1 (320) and the secondary cross rod 2 (330). The lengths of the secondary cross rod 1 (320) and the secondary cross rod 2 (330) are adjustable, and ball bearings are installed at both ends of the secondary cross rod 1 (320) and the secondary cross rod 2 (330). The welding gun (600) is installed at one end of the secondary cross rod 2 (330).

6. A liquid high-level storage tank inner cylinder welding process according to claim 5, characterized in that: The extension frame assembly (500) is installed between a main cross rod (210) and a secondary cross rod (320), and 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), and a slide seat (521) is rotatably connected to the movable end. The slide seat (521) is slidably connected to the guide rail (510), and a cable (530) is fixedly connected to one slide seat (521). The retracting module (130) is used to retract the cable (530). The main cross rod (210) and the secondary cross rod (320) are respectively fixedly connected to the adjacent guide rails (510).

7. A liquid high-level storage tank inner cylinder welding process according to claim 6, characterized in that: The retracting module (130) comprises a retaining frame (131) and an externally threaded tube (136); the retaining frame (131) is rotatably mounted on the inner side of the ring sleeve (110); the inner side wall at the other end of the ring sleeve (110) is provided with two long grooves (111); the middle position of the ring sleeve (110) is provided with two long grooves (112); the retaining frame (131) is fixedly connected to the main cross rod (210) via the long grooves (112); one end of the retaining frame (131) is rotatably connected to two guide wheels (132); the other end of the retaining frame (131) is slidably connected to a slide frame (133); one side of the slide frame (133) is rotatably connected to a slip ring (134); one end of the externally threaded tube (136) is rotatably connected to the main sleeve (100); The external threaded tube (136) is screwed with a connecting frame (135), the connecting frame (135) and the slip ring (134) are fixedly installed, one end of the cable (530) passes around the guide wheel (132) and is fixedly installed between the slide frame (133), the other end of the main sleeve (100) is rotatably connected with a driving rod 2 (139), one end of the external threaded tube (136) is fixedly sleeved with a bevel gear 4 (137), the bottom end of the driving rod 2 (139) is transmission-connected to the external threaded tube (136) through the bevel gear 4 (137), a fixing plate (138) is rotatably connected between the bottom ends of the driving rod 1 (125) and the driving rod 2 (139), and the connecting frame (135) and the fixing plate (138) are slidably connected.

8. A liquid high-level storage tank inner cylinder welding process according to claim 5, characterized in that: Two pairs of compression rods (540) are arranged between the two ends of the main cross rod 2 (220) and the auxiliary cross rod 2 (330), and one ends of the two compression rods (540) of the same pair are rotationally connected to each other, the main cross rod 2 (220) and the auxiliary cross rod 2 (330) are respectively rotationally connected to the other ends of the compression rods (540) on the adjacent sides, and a return spring (550) is fixedly connected between the two compression rods (540) of the same pair.

9. A liquid high-level storage tank inner cylinder welding process according to claim 2, characterized in that: A limiting frame assembly (400) is installed at one end of the sleeve (101), and the limiting frame assembly (400) is used to clamp with the flange pipe and limit the sleeve (101).

10. A liquid high-level storage tank, characterized in that: The invention comprises the tank structure described in claim 1.

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