CN117428362A - Liquefied gas tank welding machine - Google Patents

Abstract

The invention discloses a liquefied gas tank welding machine, in particular to the technical field of liquefied gas tank welding, which comprises a welding table and a feeding mechanism, wherein the feeding mechanism is arranged on the surface of the welding table, a supporting frame is welded at the top of the welding table, a fixing frame is connected with the top of the supporting frame through bolts, the welding mechanism is arranged in the fixing frame, an industrial personal computer is arranged on one side of the welding table, the bottom surface and the top surface of a ball are turned ninety degrees towards the direction of a tank body through the cooperation of an auxiliary moving platform and a rotating seat, the tank body is lifted through a main moving platform, the center of the section of the tank body of the liquefied gas tank and the center of the ball of the bottom surface and the top surface of the ball are kept at the same height, and finally, the positions of the tank body, the bottom surface of the ball and the top surface of the liquefied gas tank are determined through the cooperation of a first electric push rod and a positioning assembly, so that the postures of the bottom surface of the ball and the top surface of the liquefied gas tank are simply and rapidly adjusted, and the whole welding duration is shortened.

Description

A kind of liquefied gas tank welding machine

Technical field

The invention relates to the technical field of liquefied gas tank welding. The invention relates to a liquefied gas tank welding machine.

Background technique

A liquefied gas tank is a container used to store and transport liquefied petroleum gas (LPG) or other liquefied gases. It is usually made of steel or aluminum to withstand high pressure and resist corrosion. At the same time, the liquefied gas tank has sufficient strength and resistance. Corrosive, to ensure the safety of transportation and storage, liquefied gas tanks are usually processed by welding together the three parts of the liquefied gas tank: the tank body, the spherical bottom surface, and the spherical top surface.

The existing liquefied gas tank welding device requires manual labor and the help of lifting equipment to move the spherical bottom surface and the spherical top surface of the liquefied gas tank vertically to both ends of the tank body during welding, and then adjust the positions of the three. position, welding is carried out. During this process, due to the arc-shaped design of the ball bottom surface and the ball top surface itself, as well as the existing pipelines on the surface, it is difficult to keep the ball bottom surface and the ball top surface vertical during the hoisting movement. In this state, redundant manual adjustments are required to install the bottom surface and top surface of the ball vertically on the welding equipment, which prolongs the entire welding time.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a liquefied gas tank welding machine to solve the problems raised in the above-mentioned background art.

In order to achieve the above object, the present invention provides the following technical solution: a liquefied gas tank welding machine, including a welding table and a feeding mechanism. The feeding mechanism is installed on the surface of the welding table, and a support frame is welded on the top of the welding table. , the top of the support frame is bolted to a fixed frame, and a welding mechanism is installed inside the fixed frame;

An industrial computer is installed on one side of the welding station, a first step is symmetrically provided on the surface of the welding station, and a second step is provided between the first steps;

The loading mechanism includes a first moving component, an auxiliary moving platform, a rotating base, a second moving component, a main moving platform, a support plate and a positioning component. The first moving component is installed on the surface of the first step. The top of the first moving component is slidably connected to an auxiliary moving platform. The inner side of the auxiliary moving platform is rotationally connected to a rotating seat. The surface of the second step is mounted with a second moving component. The top of the second moving component is slidably connected. There is a main moving platform, a support plate is welded on the outside of the fixed frame, and a positioning component is installed on the bottom end of the support plate.

In a preferred embodiment, the first moving component includes a first guide rail, a first guide groove, a first motor, a first lead screw and a first nut seat, and the surface of the first step is fixedly connected with a first nut seat. A guide rail, a first guide groove is slidably connected to the top of the first guide rail, a first motor is installed on one side of the first guide rail, and a first wire is installed on the output shaft end of the first motor through a coupling. The outer side of the first screw is threadedly connected with a first nut seat.

In a preferred embodiment, a rotating pile is fixedly connected to the surface of the auxiliary mobile platform, a curved surface is provided on the inner wall of the auxiliary mobile platform, and a second motor is installed inside the curved surface. The second motor The output shaft end is fixedly connected with a gear.

In a preferred embodiment, a rack is embedded in the arc surface of the rotating base, a third motor is installed inside the plane of the rotating base, and a rotating disk is fixedly connected to the output shaft end of the third motor. A first electric push rod is installed symmetrically on the surface of the rotating disk. Suction cups are installed on the tops of the first electric push rods. An air pump is installed on the inside of the first electric push rod. The air inlet end of the air pump is installed with a Gas block.

In a preferred embodiment, the second moving component includes a second guide rail, a second guide groove, a fourth motor, a second lead screw and a second nut seat, and the second guide rail is symmetrically installed on the surface of the second step, A second guide groove is slidably connected to the top of the second guide rail, a fourth motor is installed between the second guide rails, and a second screw is installed at the output shaft end of the fourth motor through a coupling. The outer side of the second lead screw is threadedly connected with a second nut seat.

In a preferred embodiment, a second electric push rod is installed inside the main mobile platform, a lifting plate is installed on the top of the second electric push rod, and a fifth motor is symmetrically installed on the surface of the lifting plate. A main pulley is installed on the output shaft end of the fifth motor.

In a preferred embodiment, the positioning assembly includes a third electric push rod, a mounting base, a sixth motor, an auxiliary plate and an auxiliary pulley. The third electric push rod is symmetrically installed on the bottom of the support plate. The piston rod end of the three electric push rods is fixedly connected with a mounting seat. A sixth motor is embedded inside the mounting seat. An auxiliary plate is installed on the output shaft end of the sixth motor. An auxiliary plate is installed on the other end of the auxiliary plate. pulley.

In a preferred embodiment, the welding mechanism includes an adjustment component, a telescopic component and a welding gun. An adjustment component is installed inside the fixed frame. A telescopic component is installed on one side of the adjustment component. The bottom of the telescopic component A welding gun is installed.

In a preferred embodiment, the adjustment assembly includes a seventh motor, a third lead screw, a third nut seat, a positioning plate and a positioning rod. A seventh motor is installed inside the fixed frame. The seventh motor The output shaft end is equipped with a third screw through a coupling. The outer side of the third screw is threadedly connected to a third nut seat. The bottom of the fixed frame is bolted to a positioning plate. The positioning plates are fixed between A positioning rod is connected, and the positioning rod penetrates the lower half of the third nut seat.

In a preferred embodiment, the telescopic assembly includes a fixed base, a cylinder, a mounting plate, an eighth motor, a first connecting arm, a ninth motor and a second connecting arm. One side of the third nut seat is installed with A fixed base, a cylinder is installed on the top of the fixed base, and the piston rod end of the cylinder penetrates the fixed base. The piston rod end of the cylinder is fixedly connected to a mounting plate, and an eighth motor is installed inside the mounting plate. The dual output shaft ends of the eighth motor are fixedly connected to a first connecting arm, a ninth motor is installed inside the first connecting arm, and the dual output shaft ends of the ninth motor are fixedly connected to a second connecting arm, The second connecting arm is fixedly connected to the welding gun.

Technical effects and advantages of the present invention:

1. Through the setting of the loading mechanism, the present invention, when in use, uses the cooperation of the first moving component and the second moving component to synchronously move the tank body, spherical bottom surface and spherical top surface of the liquefied gas tank to just below the positioning component. , then, through the cooperation of the auxiliary moving platform and the rotating seat, the spherical bottom surface and the spherical top surface are turned ninety degrees in the direction of the tank body, and then the height of the tank body is raised through the main moving platform, so that the center of the cross-section of the liquefied gas tank The height of the liquefied gas tank is kept at the same height as the center of the spherical bottom surface and the spherical top surface. Finally, through the cooperation of the first electric push rod and the positioning component, the tank body, spherical bottom surface and spherical top surface of the liquefied gas tank are determined. position, thus, the postures of the bottom surface and top surface of the ball of the liquefied gas tank can be adjusted simply and quickly, shortening the entire welding time;

2. Through the setting of the welding structure, the present invention adjusts the distance between the two welding guns by adjusting the setting of the components during use, so that the welding gun is aligned with the welding seam between the tank body of the liquefied gas tank and the spherical bottom surface of the liquefied gas tank and the liquefied gas. The welding seam between the tank body and the spherical top surface of the liquefied gas tank, and then, through the telescopic assembly, the welding gun can fit the welding seam. Finally, during the rotation of the liquefied gas tank body, spherical bottom surface and spherical top surface , complete the welding.

Description of the drawings

Figure 1 is a schematic diagram of the overall appearance structure of the present invention;

Figure 2 is a schematic front view of the working state of the loading mechanism of the present invention;

Figure 3 is a schematic rear view of the working state of the loading mechanism of the present invention;

Figure 4 is a schematic structural diagram of the welding station of the present invention;

Figure 5 is a schematic diagram of the cooperation between the first mobile component and the auxiliary mobile platform of the present invention;

Figure 6 is a schematic cross-sectional structural diagram of the auxiliary mobile platform of the present invention;

Figure 7 is a schematic diagram of the position of the third motor of the present invention;

Figure 8 is a schematic diagram of the cooperation between the second mobile component and the main mobile platform of the present invention;

Figure 9 is a schematic cross-sectional structural diagram of the main mobile platform of the present invention;

Figure 10 is a schematic structural diagram of the telescopic component of the present invention;

Figure 11 is a schematic structural diagram of the positioning component of the present invention;

Figure 12 is a schematic assembly diagram of the tank body, spherical bottom surface and spherical top surface of the liquefied gas tank of the present invention.

The reference numbers are: 1. Welding station; 11. Industrial computer; 12. First step; 13. Second step; 2. Feeding mechanism; 21. First moving component; 211. First guide rail; 212. First Guide groove; 213, first motor; 214, first screw; 215, first nut seat; 22, auxiliary moving platform; 221, rotating pile; 222, curved surface; 223, second motor; 224, gear; 23 , rotating seat; 231, rack; 232, third motor; 233, rotating plate; 234, first electric push rod; 235, suction cup; 236, air pump; 237, air collecting block; 24, second moving component; 241 , the second guide rail; 242, the second guide groove; 243, the fourth motor; 244, the second screw; 245, the second nut seat; 25, the main moving platform; 251, the second electric push rod; 252, the lifting plate ; 253. Fifth motor; 254. Main pulley; 26. Support plate; 27. Positioning component; 271. Third electric push rod; 272. Mounting base; 273. Sixth motor; 274. Auxiliary plate; 275. Auxiliary pulley ; 3. Support frame; 4. Fixed frame; 5. Welding mechanism; 51. Adjustment component; 511. Seventh motor; 512. Third screw; 513. Third nut seat; 514. Positioning plate; 515. Positioning rod ; 52. Telescopic component; 521. Fixing seat; 522. Cylinder; 523. Installation plate; 524. Eighth motor; 525. First connecting arm; 526. Ninth motor; 527. Second connecting arm; 53. Welding gun.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some 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 fall within the scope of protection of the present invention.

Embodiment 1

Referring to Figures 1-9 and 11, the present invention provides a technical solution: a liquefied gas tank welding machine, including a welding station 1 and a feeding mechanism 2. The feeding mechanism 2 is installed on the surface of the welding station 1. A support frame 3 is welded to the top of the welding table 1, a fixed frame 4 is bolted to the top of the support frame 3, and a welding mechanism 5 is installed inside the fixed frame 4;

An industrial computer 11 is installed on one side of the welding station 1. A first step 12 is symmetrically provided on the surface of the welding station 1, and a second step 13 is provided between the first steps 12;

The loading mechanism 2 includes a first moving component 21, an auxiliary moving platform 22, a rotating base 23, a second moving component 24, a main moving platform 25, a support plate 26 and a positioning component 27. The surface of the first step 12 is equipped with first Moving component 21, the top of the first moving component 21 is slidingly connected to an auxiliary moving platform 22, the inside of the auxiliary moving platform 22 is rotatably connected to a rotating base 23, and a second moving component 24 is installed on the surface of the second step 13. The second moving component The main moving platform 25 is slidably connected to the top of the fixed frame 4 , a support plate 26 is welded to the outside of the fixed frame 4 , and a positioning assembly 27 is installed at the bottom end of the support plate 26 .

Specifically, the first moving component 21 includes a first guide rail 211, a first guide groove 212, a first motor 213, a first screw 214 and a first nut seat 215. The first guide rails are fixedly connected to the surface of the first step 12. 211. The top of the first guide rail 211 is slidably connected to the first guide groove 212. The first motor 213 is installed on one side of the first guide rail 211. The first screw 214 is installed on the output shaft end of the first motor 213 through a coupling. , the outer side of the first screw 214 is threadedly connected with the first nut seat 215. Through the setting of the first moving component 21, the characteristics of high precision, high efficiency and good stability of the screw transmission are used to drive the auxiliary moving platform 22 along the first moving assembly 21. A guide rail 211 moves smoothly toward the direction of the welding mechanism 5 .

It should be noted that there are two first nut seats 215, and the moving directions of the two on the first screw 214 are consistent. At the same time, the first nut seat 215 is symmetrical with the first guide groove 212 to ensure that the auxiliary moving platform 22 Mobile stability.

Specifically, a rotating pile 221 is fixedly connected to the surface of the auxiliary mobile platform 22, and a curved surface 222 is provided on the inner wall of the auxiliary mobile platform 22. A second motor 223 is installed inside the curved surface 222, and the output shaft end of the second motor 223 is fixedly connected. There is a gear 224. When the rotating base 23 rotates inside the auxiliary moving platform 22, the curved surface 222 and the planes at both ends of the arc surface of the rotating base 23 support the movement of the rotating base 23.

Specifically, the rack 231 is embedded in the arc surface of the rotating seat 23, and the third motor 232 is installed in the plane of the rotating seat 23. The output shaft end of the third motor 232 is fixedly connected with the rotating disk 233, and the surface of the rotating disk 233 is installed symmetrically. There is a first electric push rod 234, a suction cup 235 is installed on the top of the first electric push rod 234, an air pump 236 is installed on the inside of the first electric push rod 234, and an air collecting block 237 is installed on the air inlet end of the air pump 236. The cooperation of the air pump 236 and the suction cup 235 installs the spherical bottom surface and the spherical top surface of the liquefied gas tank on the rotating disk 233.

It should be noted that during installation, the arcuate rack 231 of the rotating base 23 is in mesh with the gear 224 inside the auxiliary moving platform 22. Furthermore, through the cooperation of the rack 231 and the gear 224, the rotating base 23 is positioned on the rotating pile 221. The inner side rotates at a constant speed. At the same time, the air collecting block 237 is a hollow structure. There are four ventilation holes on the outside of the air collecting block 237. These ventilation holes are connected to the suction cups 235 through conduits, so that the air pump 236 can control the four suction cups 235 at the same time, and , the length of the conduit is long enough and will not affect the movement of the spherical bottom surface and the spherical top surface of the liquefied gas tank driven by the first electric push rod 234.

Specifically, the second moving component 24 includes a second guide rail 241, a second guide groove 242, a fourth motor 243, a second screw 244 and a second nut seat 245. The second guide rail 241 is symmetrically installed on the surface of the second step 13. , the top of the second guide rail 241 is slidingly connected with a second guide groove 242, a fourth motor 243 is installed between the second guide rails 241, and a second screw 244 is installed at the output shaft end of the fourth motor 243 through a coupling. The outer sides of the two screws 244 are threadedly connected with a second nut seat 245. Through the setting of the second moving component 24, the characteristics of high precision, high efficiency and good stability of screw transmission are used to drive the main moving platform 25 along the second guide rail. 241 moves toward the direction of the welding mechanism 5 smoothly.

It should be noted that there are two second nut seats 245, and the moving directions of the two on the second screw 244 are consistent. At the same time, the second nut seat 245 is installed at the center of the line connecting the second guide groove 242. Ensure the stability of the movement of the main mobile platform 25.

Specifically, a second electric push rod 251 is installed inside the main mobile platform 25. A lifting plate 252 is installed on the top of the second electric push rod 251. A fifth motor 253 is symmetrically installed on the surface of the lifting plate 252. The fifth motor 253 A main pulley 254 is installed at the end of the output shaft. When the spherical bottom surface and the spherical top surface of the liquefied gas tank rotate to a vertical state, the height of the center of the cross section of the liquefied gas tank can be adjusted through the second electric push rod 251 so that it is in line with the liquefied gas tank. The center of the spherical bottom surface of the gas tank and the spherical top surface remain at the same height.

It should be noted that when placing the body of the liquefied gas tank, the body of the liquefied gas tank needs to be placed inside the fifth motor 253. At the same time, the distance between the fifth motors 253 is small and will not affect the tank body. The connection between the bottom surface of the ball and the top surface of the ball.

Specifically, the positioning assembly 27 includes a third electric push rod 271, a mounting base 272, a sixth motor 273, an auxiliary plate 274 and an auxiliary pulley 275. The third electric push rod 271 is symmetrically installed on the bottom of the support plate 26. The piston rod end of the rod 271 is fixedly connected with a mounting seat 272. A sixth motor 273 is embedded inside the mounting seat 272. An auxiliary plate 274 is installed at the output shaft end of the sixth motor 273. An auxiliary pulley 275 is installed at the other end of the auxiliary plate 274. , through the cooperation of the third electric push rod 271 and the sixth motor 273, the auxiliary pulley 275 can be made to fit the body of the liquefied gas tank to prevent the body of the liquefied gas tank from falling out of position during rotation.

Embodiment 2

Please refer to Figure 1, Figure 3 and Figure 10. Comparative Embodiment 1. As another embodiment of the invention, the welding mechanism 5 includes an adjusting component 51, a telescopic component 52 and a welding gun 53. An adjusting component is installed inside the fixed frame 4. Component 51, a telescopic component 52 is installed on one side of the adjusting component 51, and a welding gun 53 is installed on the bottom of the telescopic component 52. Through the setting of the adjusting component 51, the distance between the two welding guns 53 is adjusted so that the welding gun 53 is aligned with the liquefied gas tank. The welding seam between the body and the spherical bottom surface of the liquefied gas tank and the welding seam between the body of the liquefied gas tank and the spherical top surface of the liquefied gas tank. Furthermore, through the telescopic assembly 52, the welding gun 53 can be made to fit the welding seam. Finally, in the liquefaction The welding is completed during the rotation of the tank body, spherical bottom surface and spherical top surface of the gas tank.

Specifically, the adjustment component 51 includes a seventh motor 511, a third lead screw 512, a third nut seat 513, a positioning plate 514 and a positioning rod 515. The seventh motor 511 is installed inside the fixed frame 4, and the output of the seventh motor 511 A third lead screw 512 is installed on the shaft end through a coupling. The outside of the third lead screw 512 is threadedly connected with a third nut seat 513. The bottom of the fixed frame 4 is bolted with a positioning plate 514. The positioning plates 514 are fixedly connected with The positioning rod 515 penetrates the lower half of the third nut seat 513 .

It should be noted that there are two third nut seats 513 , the third nut seats 513 are symmetrically arranged on the surface of the third screw 512 , and the two third nut seats 513 move in opposite directions, and the positioning rod 515 and the third nut seat 513 move in opposite directions. The three screws 512 remain parallel to each other.

Specifically, the telescopic assembly 52 includes a fixed base 521, a cylinder 522, a mounting plate 523, an eighth motor 524, a first connecting arm 525, a ninth motor 526 and a second connecting arm 527. The third nut seat 513 is installed on one side. The fixed base 521 has a cylinder 522 installed on the top of the fixed base 521. The piston rod end of the cylinder 522 penetrates the fixed base 521. The piston rod end of the cylinder 522 is fixedly connected to a mounting plate 523. An eighth motor 524 is installed inside the mounting plate 523. The dual output shaft ends of the eighth motor 524 are fixedly connected to the first connecting arm 525. The ninth motor 526 is installed inside the first connecting arm 525. The dual output shaft ends of the ninth motor 526 are fixedly connected to the second connecting arm 527. The second connecting arm 527 is fixedly connected to the welding gun 53 .

It should be noted that the shape and size of the installation plate 523 is consistent with the shape and size of the through hole of the fixed base 521. The installation plate 523 can be brought into the interior of the fixed base 521 by the piston rod end of the cylinder 522, raising the height of the welding gun 53 to avoid the welding gun 53 Inadvertent contact with the liquefied gas tank.

Working principle of the invention:

In the first step, place the tank body of the liquefied gas tank inside the fifth motor 253, and both ends of the tank body are outside the fifth motor 253;

In the second step, the spherical bottom surface and the spherical top surface of the liquefied gas tank are placed horizontally on the auxiliary moving platforms 22 on both sides respectively. Then, the gas inside the suction cup 235 is synchronously discharged through the air pump 236, and the spherical bottom surface and the spherical top surface of the liquefied gas tank are The top surface is securely fastened;

The third step is to drive the first screw 214 and the second screw 244 to rotate through the synchronous movement of the first motor 213 and the fourth motor 243 respectively, and drive the auxiliary moving platform 22 through the first nut seat 215 and the second nut seat 245. Move in the direction of the welding gun 53 synchronously with the main moving platform 25 until it moves directly below the positioning assembly 27;

In the fourth step, the second motor 223 drives the gear 224 to rotate, and then cooperates with the rack 231, so that the rotating seat 23 drives the spherical bottom surface and the spherical top surface of the liquefied gas tank to rotate ninety degrees toward the direction of the liquefied gas tank body;

The fifth step is to raise the height of the liquefied gas tank through the second electric push rod 251, so that the height of the center of the cross section of the liquefied gas tank is consistent with the center of the spherical bottom surface and the spherical top surface of the liquefied gas tank. Keep the same height;

In the sixth step, the first electric push rod 234 works synchronously, so that the spherical bottom surface and the spherical top surface of the liquefied gas tank move toward the tank body, so that the weld seam fits together. At the same time, the entire liquefied gas tank is installed in the center of the welding station 1;

In the seventh step, the third electric push rod 271 is used to lower the height of the auxiliary pulley 275, and then the sixth motor 273 is used to make the auxiliary pulley 275 move toward the tank body of the liquefied gas tank at the same time, so that the auxiliary pulley 275 is close to the liquefied gas tank. outer wall of the tank;

In the eighth step, the seventh motor 511 drives the third screw 512 to rotate, and then moves the welding gun 53 to one side of the two weld seams through the third nut seat 513. Then, the height of the welding gun 53 is lowered through the cylinder 522, and then, Through the cooperation of the eighth motor 524 and the ninth motor 526, the angle between the connecting arms is adjusted so that the welding gun 53 is close to the welding seam;

In the ninth step, the third motor 232 and the fifth motor 253 work synchronously to drive the tank body, spherical bottom surface and spherical top surface of the liquefied gas tank to rotate at a constant speed, and start the welding gun 53 to complete the welding work.

It should be noted that the actuators used in the present invention are all controlled by the industrial computer 11, and the industrial computer 11 and the actuators are connected through wires.

The last few points that should be explained are: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense and can be mechanical connections. Or electrical connection, or internal connection between two components, or direct connection. "Up", "Down", "Left", "Right", etc. are only used to express relative positional relationships. When the absolute position of the object being described is change, the relative positional relationship may change;

Secondly: the drawings of the disclosed embodiments of the present invention only involve structures related to the disclosed embodiments. Other structures can refer to common designs. The same embodiment and different embodiments of the present invention can be combined with each other without conflict;

Finally: the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A liquefied gas tank welding machine, including a welding station (1) and a loading mechanism (2), characterized in that: a loading mechanism (2) is installed on the surface of the welding station (1), and the welding station (1) is equipped with a loading mechanism (2). A support frame (3) is welded to the top of (1), a fixed frame (4) is bolted to the top of the support frame (3), and a welding mechanism (5) is installed inside the fixed frame (4); An industrial computer (11) is installed on one side of the welding station (1). A first step (12) is symmetrically provided on the surface of the welding station (1), and a third step (12) is provided between the first steps (12). Two steps (13); The loading mechanism (2) includes a first moving component (21), an auxiliary moving platform (22), a rotating base (23), a second moving component (24), a main moving platform (25), and a support plate (26) and a positioning component (27). The first moving component (21) is installed on the surface of the first step (12). The top of the first moving component (21) is slidingly connected with a auxiliary moving platform (22), so A rotating base (23) is rotatably connected to the inner side of the auxiliary moving platform (22), a second moving component (24) is installed on the surface of the second step (13), and the top of the second moving component (24) slides The main mobile platform (25) is connected, a support plate (26) is welded on the outside of the fixed frame (4), and a positioning assembly (27) is installed on the bottom end of the support plate (26). 2. A liquefied gas tank welding machine according to claim 1, characterized in that: the first moving component (21) includes a first guide rail (211), a first guide groove (212), a first motor ( 213), the first screw (214) and the first nut seat (215), the surface of the first step (12) is fixedly connected with a first guide rail (211), and the top of the first guide rail (211) A first guide groove (212) is slidably connected. A first motor (213) is installed on one side of the first guide rail (211). The output shaft end of the first motor (213) is equipped with a third motor (213) through a coupling. A screw (214) is provided, and a first nut seat (215) is threadedly connected to the outer side of the first screw (214). 3. A liquefied gas tank welding machine according to claim 1, characterized in that: the surface of the auxiliary moving platform (22) is fixedly connected with a rotating pile (221), and the inner wall of the auxiliary moving platform (22) A curved surface (222) is provided, a second motor (223) is installed inside the curved surface (222), and a gear (224) is fixedly connected to the output shaft end of the second motor (223). 4. A liquefied gas tank welding machine according to claim 1, characterized in that: a rack (231) is embedded in the arc surface of the rotating seat (23), and a rack (231) is installed inside the plane of the rotating seat (23). There is a third motor (232), the output shaft end of the third motor (232) is fixedly connected with a rotating disk (233), and a first electric push rod (234) is symmetrically installed on the surface of the rotating disk (233), A suction cup (235) is installed on the top of the first electric push rod (234). An air pump (236) is installed on the inside of the first electric push rod (234). The air inlet end of the air pump (236) A gas collecting block (237) is installed. 5. A liquefied gas tank welding machine according to claim 1, characterized in that: the second moving component (24) includes a second guide rail (241), a second guide groove (242), and a fourth motor (243) , the second screw (244) and the second nut seat (245), the second guide rail (241) is symmetrically installed on the surface of the second step (13), and the top of the second guide rail (241) is slidingly connected with A fourth motor (243) is installed between the second guide groove (242) and the second guide rails (241). The output shaft end of the fourth motor (243) is equipped with a second screw (243) through a coupling. 244), the outer side of the second screw (244) is threadedly connected to a second nut seat (245). 6. A liquefied gas tank welding machine according to claim 1, characterized in that: a second electric push rod (251) is installed inside the main mobile platform (25), and the second electric push rod (251) is installed inside the main mobile platform (25). A lifting plate (252) is installed on the top of the lifting plate (251), a fifth motor (253) is installed symmetrically on the surface of the lifting plate (252), and a main pulley (254) is installed on the output shaft end of the fifth motor (253). . 7. A liquefied gas tank welding machine according to claim 1, characterized in that: the positioning assembly (27) includes a third electric push rod (271), a mounting base (272), and a sixth motor (273) , auxiliary plate (274) and auxiliary pulley (275), the bottom of the support plate (26) is symmetrically installed with a third electric push rod (271), and the piston rod end of the third electric push rod (271) is fixedly connected There is a mounting base (272). A sixth motor (273) is embedded inside the mounting base (272). An auxiliary plate (274) is installed on the output shaft end of the sixth motor (273). The auxiliary plate (274) The other end of 274) is equipped with an auxiliary pulley (275). 8. A liquefied gas tank welding machine according to claim 1, characterized in that: the welding mechanism (5) includes an adjustment component (51), a telescopic component (52) and a welding gun (53), and the fixed frame An adjusting component (51) is installed inside (4), a telescopic component (52) is installed on one side of the adjusting component (51), and a welding gun (53) is installed on the bottom of the telescopic component (52). 9. A liquefied gas tank welding machine according to claim 8, characterized in that: the adjustment component (51) includes a seventh motor (511), a third lead screw (512), and a third nut seat (513). ), positioning plate (514) and positioning rod (515). A seventh motor (511) is installed inside the fixed frame (4). The output shaft end of the seventh motor (511) is installed with a coupling through a coupling. A third screw (512), the outer side of the third screw (512) is threadedly connected to a third nut seat (513), and the bottom of the fixed frame (4) is bolted to a positioning plate (514). A positioning rod (515) is fixedly connected between the positioning plates (514), and the positioning rod (515) penetrates the lower half of the third nut seat (513). 10. A liquefied gas tank welding machine according to claim 9, characterized in that: the telescopic assembly (52) includes a fixed base (521), a cylinder (522), a mounting plate (523), an eighth motor ( 524), the first connecting arm (525), the ninth motor (526) and the second connecting arm (527). A fixed seat (521) is installed on one side of the third nut seat (513). The fixed seat A cylinder (522) is installed on the top of the cylinder (521), and the piston rod end of the cylinder (522) passes through the fixed seat (521). The piston rod end of the cylinder (522) is fixedly connected with the mounting plate (523), so An eighth motor (524) is installed inside the installation plate (523). The double output shaft ends of the eighth motor (524) are fixedly connected to a first connecting arm (525). The first connecting arm (525) A ninth motor (526) is installed inside. The double output shaft ends of the ninth motor (526) are fixedly connected with a second connecting arm (527). The second connecting arm (527) and the welding gun (53) The connection is fixed.