Automatic welding equipment for liquefied gas steel cylinder

Abstract

The invention belongs to the technical field of steel cylinder welding equipment, and particularly relates to liquefied gas steel cylinder automatic welding equipment which comprises a bottom plate, two first clamping assemblies are arranged at the upper end of the bottom plate, each first clamping assembly comprises two first arc-shaped plates, and the two first arc-shaped plates can be close to each other; the two first clamping assemblies can slide at the upper end of the bottom plate, a second clamping assembly is arranged on one side of each first clamping assembly, each second clamping assembly comprises a first circular ring, a disc is rotationally arranged in each first circular ring, and a plurality of cylindrical blocks are slidably arranged on one side of each disc; the first circular rings can slide at the upper end of the bottom plate, a plurality of welding heads are arranged on one side of the upper end of the bottom plate, the upper tank body and the lower tank body are driven to get close to each other, then the cylindrical block is driven to clamp the protective cover and the base and get close to the tank bodies, then the tank bodies are driven to rotate, the welding heads weld all welding seams, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel cylinder welding equipment, in particular to automatic welding equipment for liquefied gas cylinders. Background Art

[0002] Liquefied gas cylinders are Class II pressure vessels for flammable and explosive chemicals. They are widely used in the lives of urban and rural residents and in food stalls, small restaurants and small restaurants in towns. The production quality of liquefied gas cylinders undoubtedly plays a vital role in the safety of people's lives and property. The cylinder generally includes a cylinder body, a shield and a base. The base is used to support the tank body to ensure the stable placement of the cylinder. The shield is used to protect the outer shell of the valve and other internal components. When processing the cylinder, the tank body needs to be welded first, and then the shield and the base are welded.

[0003] A patent with announcement number CN112440054B discloses a welding system and a welding method for steel cylinders. Compared with the manual welding operation in the prior art, which requires complex mechanical mechanisms to fix the steel cylinder body, the present invention has a simple and reliable structure, automated welding processing, and welding operation after clamping and fixing, with high welding quality.

[0004] In the above-mentioned prior art, when welding a steel cylinder, it is necessary to first assemble and weld the steel cylinder body, and then weld the shield and the base to the upper and lower ends of the tank body, so that the steel cylinder can be completely welded. The prior art generally welds the tank body first, and then transfers the welded tank body to the next processing point for welding the shield and the base. There are many welding steps, and the work efficiency is low. In addition, in the process of transferring the tank body, the tank body may be shaken, thereby causing cracks in the weld.

[0005] To this end, the present invention provides an automatic welding device for a liquefied gas cylinder. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the automatic welding equipment for liquefied gas cylinders described in the present invention includes a base plate, and two groups of first clamping components are provided on the upper end of the base plate. The first clamping components include two first arc-shaped plates, and the two first arc-shaped plates can be close to each other. The two groups of the first clamping components can slide on the upper end of the base plate, and a second clamping component is respectively provided on one side of the two groups of the first clamping components. The second clamping components include a first ring, and a disk is respectively rotatably arranged inside the first ring, and a plurality of cylindrical blocks are slidably arranged on one side of the disk. The first ring can slide on the upper end of the base plate, and a plurality of welding heads are provided on one side of the upper end of the base plate.

[0008] Preferably, first rectangular bars are slidably penetrated on both sides of the first arc-shaped plate, the two first rectangular bars are at an angle, and rotating wheels are rotatably provided at the ends of the first rectangular bars.

[0009] Preferably, the first rectangular bar is rotatably connected to one end away from the rotating wheel with a connecting rod, and the connecting rod is rotatably connected to one side of the first arc-shaped plate through a pin at one end away from the first rectangular bar. A plurality of teeth are provided at the end away from the first rectangular bar, and the teeth are respectively meshed with gears. The two gears are rotatably connected to one side of the first arc-shaped plate through a pin, and the two gears are meshed with each other.

[0010] Preferably, second rectangular blocks are fixedly connected to both sides of the upper end of the bottom plate, a second cylindrical rod is fixedly connected between the two second rectangular blocks, second arc plates are fixedly connected to the outer side of the first arc plate through the first rectangular plates, first rectangular blocks are fixedly connected to the outer side of the second arc plates, the first rectangular block located at the lower end can slide on the outer side of the second cylindrical rod, a first L-shaped block is fixedly connected to one side of the first rectangular block located at the lower end, a second L-shaped block is fixedly connected to one side of the first rectangular block located at the upper end, and the second L-shaped block can slide inside the upper end of the first L-shaped block.

[0011] Preferably, the second clamping assembly also includes a circular plate rotatably connected to the middle part of the disc, a plurality of arc-shaped holes are provided on the inner edge of the circular plate, the cylindrical block can slide inside the arc-shaped holes, a second ring is fixedly connected to one end of the cylindrical block away from the circular plate, a first rectangular groove is provided at a position corresponding to the cylindrical block on the side of the disc close to the circular plate, and the ends of the cylindrical blocks can slide in the first rectangular grooves.

[0012] Preferably, a second rectangular plate is fixedly connected to the lower end of the first circular ring, a second cylinder is slidably arranged in the middle of the two circular disks, a third rectangular plate is fixedly connected to the ends of the second cylinders, and the third rectangular plate and the second rectangular plate can slide on the outside of the second cylindrical rod respectively.

[0013] Preferably, the interiors of the two second cylinders are fixedly connected to the first cylindrical rod via springs, and the first cylindrical rod can slide inside the second cylinders.

[0014] Preferably, a first cylinder is passed through and fixed in the middle of the two opposite gears, a cylindrical bar is slidably provided in the middle of the first cylinder, a second rectangular groove is provided at the upper end of the cylindrical bar, and the first cylinder can slide in the second rectangular groove through a slider.

[0015] Preferably, both ends of the cylindrical bar at the lower end are fixedly connected to the second rectangular bar respectively, and both ends of the cylindrical bar at the upper end are fixedly connected to the third rectangular bar respectively, and the third rectangular bar can slide inside the second rectangular bar.

[0016] Preferably, one end of the welding head is slidably connected to a third cylinder, and one end of the third cylinder away from the welding head is fixedly connected to a fourth rectangular bar, and the lower ends of the fourth rectangular bars can slide on slide rails, and the slide rails are fixedly connected to the upper end of the bottom plate.

[0017] The beneficial effects of the present invention are as follows: 1. The automatic welding equipment for liquefied gas cylinders described in the present invention drives two groups of arc plates to approach each other to drive the rotating wheels to approach each other to clamp the upper tank body and the lower tank body respectively, then drives the upper tank body and the lower tank body to approach each other, then drives the cylindrical blocks to slide on one side of the disc to clamp the shield and the base respectively, then brings the shield and the base close to the tank body, then drives the disc to drive the cylindrical block to slide in the middle of the first ring, drives the shield and the base to rotate, and drives the upper tank body and the lower tank body to rotate at the same time, and drives the welding head to weld each weld, so that the tank body, shield and base of the cylinder can be welded at the same time, thereby reducing the working steps and improving the working efficiency.

[0018] 2. The automatic welding equipment for liquefied gas cylinders described in the present invention drives two sets of gears to rotate at the same time by driving the cylindrical bar. The gear drives the rotating wheel at the end of the first rectangular bar to slide inside the first arc plate through the connecting rod, so that the middle tank body can be clamped. The sliding amplitude of the first rectangular bar can be adjusted according to the different diameters of the tank bodies, and can be used to clamp the tank bodies with different diameters. At the same time, when driving the upper tank body and the lower tank body to approach each other, the gear can slide on the outside of the cylindrical bar through the first cylinder without affecting the rotation of the driving gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention; Figure 2 It is the cylinder structure diagram; Figure 3 It is a schematic diagram of the welding head position; Figure 4 is a schematic diagram of the structure of the first clamping assembly; Figure 5 It is a schematic diagram of the position of the rotating wheel; Figure 6 is a schematic diagram of the position of the first ring; Figure 7 This is a schematic diagram of the explosion inside the disk; Figure 8 It is a schematic diagram of the position of the cylindrical strip; Fig. 9 is a schematic diagram of the connection between the first cylinder and the cylindrical bar; In the figure: 1, first arc-shaped plate; 11, first rectangular bar; 111, rotating wheel; 12, connecting rod; 121, teeth; 13, gear; 131, first cylinder; 14, first rectangular plate; 141, second arc-shaped plate; 142, first rectangular block; 143, first L-shaped block; 144, second L-shaped block; 2, first circular ring; 21, second rectangular plate; 22, circular disk; 221, first rectangular groove; 23, circular plate; 23 1. Arc hole; 232. Cylindrical block; 233. Second ring; 24. Second cylinder; 241. Spring; 242. First cylindrical rod; 25. Third rectangular plate; 3. Bottom plate; 31. Second rectangular block; 32. Second cylindrical rod; 33. Second rectangular strip; 331. Third rectangular strip; 34. Cylindrical strip; 341. Second rectangular groove; 4. Welding head; 41. Third cylinder; 42. Fourth rectangular strip; 43. Slide rail. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0022] like Figure 1-Figure 4 , Figure 7 As shown, an automatic welding device for liquefied gas cylinders described in an embodiment of the present invention includes a base plate 3, and two groups of clamping components are provided on the upper end of the base plate 3. The first clamping component includes two first arc-shaped plates 1, and the two first arc-shaped plates 1 can be close to each other. The two groups of first clamping components can slide on the upper end of the base plate 3, and a second clamping component is provided on one side of the two groups of first clamping components. The second clamping component includes a first ring 2, and a disk 22 is rotatably arranged inside the first ring 2, and a plurality of cylindrical blocks 232 are slidably arranged on one side of the disk 22. The first ring 2 can slide on the upper end of the base plate 3, and a plurality of welding heads 4 are provided on one side of the upper end of the base plate 3.

[0023] Specifically, when welding a steel cylinder, the prior art requires welding the tank body first, then transferring the tank body, and then welding the shield and the base to the upper and lower ends of the tank body. In the process of transferring the tank body, the weld of the tank body may crack, and there are many welding steps, and the work efficiency is slow. When using the present welding equipment, first place the upper tank body and the lower tank body between the two groups of first arc plates 1 respectively, then drive the two first arc plates 1 close to each other to clamp the upper tank body and the lower tank body respectively, then place the shield and the base between the cylindrical blocks 232 on both sides respectively, then simultaneously drive several cylindrical blocks 232 on both sides to slide on one side of the disc 22 to clamp the shield and the base respectively, then drive the two groups of first arc plates 1 to drive the upper tank body and the lower tank body to slide toward the middle at the same time, so that the upper tank body and the lower tank body are assembled together, then drive the discs 22 on both sides to drive the shield and the base clamped in the middle of the cylindrical blocks 232 to the middle. The tank body is brought close to each other so that the shield is against one side of the upper tank body and the base is against one side of the lower tank body. Then the welding head 4 is adjusted to be located at the weld between the upper tank body and the lower tank body, the weld between the shield and the upper tank body, and the weld between the base and the lower tank body respectively. Then the driving disc 22 drives the cylindrical block 232 to slide in the middle of the first ring 2, driving the shield and the base to rotate, and driving the upper tank body and the lower tank body to rotate at the same time. The welding head 4 is connected through a wire harness welding machine, and the welding machine adopts a plasma arc welding machine. At the same time, the welding head 4 is driven to weld each weld, and the tank body, shield and base of the cylinder can be welded at the same time, which reduces the working steps and improves the working efficiency.

[0024] like Figure 5 As shown, first rectangular bars 11 are slidably penetrated on both sides of the first arc-shaped plate 1 , the two first rectangular bars 11 are 90 degrees apart, and rotating wheels 111 are rotatably provided at the ends of the first rectangular bars 11 .

[0025] Specifically, before welding, the upper can body and the lower can body are respectively placed on the rotating wheel 111 provided in the middle of the first curved plate 1, and then the first rectangular bar 11 is driven to drive the rotating wheel 111 to slide inside the first curved plate 1, so that the middle can body can be clamped. At the same time, the sliding amplitude of the first rectangular bar 11 is adjusted according to the different diameters of cans, which can be used to clamp cans of different diameters.

[0026] like Figure 5 As shown, one end of the first rectangular bar 11 away from the rotating wheel 111 is rotatably connected with a connecting rod 12, and one end of the connecting rod 12 away from the first rectangular bar 11 is rotatably connected to one side of the first arc plate 1 through a pin. One end of the connecting rod 12 away from the first rectangular bar 11 is provided with a plurality of teeth 121, and the teeth 121 are respectively meshed with gears 13. The two gears 13 are rotatably connected to one side of the first arc plate 1 through a pin, and the two gears 13 are meshed with each other.

[0027] Specifically, the gear 13 on one side is driven to rotate, and the gears 13 on both sides rotate to drive the connecting rod 12 to rotate through the teeth 121 provided at one end of the connecting rod 12. When the connecting rod 12 rotates, it drives the first rectangular bars 11 on both sides to slide inside the first arc plate 1, and at the same time, it can drive each rotating wheel 111 to move inside the first arc plate 1, and the two rotating wheels 111 can be adjusted to move inside the first arc plate 1 at the same time.

[0028] like Figure 4 As shown, second rectangular blocks 31 are fixedly connected to both sides of the upper end of the bottom plate 3, a second cylindrical rod 32 is fixedly connected between the two second rectangular blocks 31, second arc plates 141 are fixedly connected to the outer side of the first arc plate 1 through the first rectangular plate 14, first rectangular blocks 142 are fixedly connected to the outer side of the second arc plates 141, the first rectangular block 142 located at the lower end can slide on the outside of the second cylindrical rod 32, a first L-shaped block 143 is fixedly connected to one side of the first rectangular block 142 located at the lower end, a second L-shaped block 144 is fixedly connected to one side of the first rectangular block 142 located at the upper end, and the second L-shaped block 144 can slide inside the upper end of the first L-shaped block 143.

[0029] Specifically, by driving the second L-shaped block 144 to slide upward from the first L-shaped block 143, the second L-shaped block 144 drives the first curved plate 1 to move upward through the first rectangular block 142, the first curved plate 1 drives the rotating wheel 111 to move through the first rectangular bar 11, and then the tank body is placed in the upper end of the rotating wheel 111 at the lower end, and then the second L-shaped block 144 is driven to slide into the first L-shaped block 143, the second L-shaped block 144 drives the first curved plate 1 to move downward through the first rectangular block 142, the first curved plate 1 drives the rotating wheel 111 to move downward through the first rectangular bar 11, the middle tank body is clamped and fixed, after the upper tank body and the lower tank body are clamped and fixed, the first rectangular block 142 at the lower end is driven to slide outside the second cylindrical rod 32, the upper tank body and the lower tank body are driven to approach each other, so that the upper tank body and the lower tank body are assembled together, and then welded.

[0030] like Figure 7 As shown, the second clamping assembly also includes a circular plate 23 rotatably connected to the middle part of the disc 22, a plurality of arc holes 231 are provided on the inner edge of the circular plate 23, and a cylindrical block 232 can slide inside the arc holes 231. A second ring 233 is fixedly connected to the end of the cylindrical block 232 away from the circular plate 23, and a first rectangular groove 221 is provided at the position corresponding to the cylindrical block 232 on the side of the disc 22 close to the circular plate 23, and the ends of the cylindrical block 232 can slide in the first rectangular groove 221.

[0031] Specifically, when the sleeve and the base are clamped, the circular plate 23 is driven to rotate in the disc 22. When the circular plate 23 rotates, the cylindrical block 232 is driven to slide in the first rectangular groove 221, and the cylindrical block 232 is made to slide in the arc hole 231 at the same time, so that the cylindrical block 232 approaches the edge of the sleeve and the base at the same time until the sleeve and the base are clamped, and then the disc 22 is driven to drive the sleeve and the base to approach and fit the tank body, and then welding is performed.

[0032] like Figure 6 As shown, a second rectangular plate 21 is fixedly connected to the lower end of the first ring 2, a second cylinder 24 is slidably arranged in the middle of the two disks 22, and a third rectangular plate 25 is fixedly connected to the ends of the second cylinder 24. The third rectangular plate 25 and the second rectangular plate 21 can slide on the outside of the second cylindrical rod 32 respectively.

[0033] Specifically, after the shield and the base are clamped and fixed on one side of the disc 22, the third rectangular plates 25 on both sides are driven to slide on the second cylindrical rod 32 and slide toward the middle at the same time. The third rectangular plate 25 on one side drives the second cylinder 24 to approach the upper tank body, and the third rectangular plate 25 on the other side drives the second cylinder 24 to approach the lower tank body, until the second cylinders 24 on both sides squeeze the upper tank body and the lower tank body toward the middle at the same time, so that the upper tank body and the lower tank body fit more closely, and then the second rectangular plates 21 on both sides are driven to drive the disc 22 to approach one side of the upper tank body and the lower tank body at the same time, until the shield and the base are tightly attached to both ends of the tank body, the various parts of the cylinder are combined together, and the various welds are tightly attached, and then welding is performed.

[0034] like Figure 6 As shown, the interiors of the two second cylinders 24 are fixedly connected to the first cylindrical rod 242 via springs 241 , and the first cylindrical rod 242 can slide inside the second cylinders 24 .

[0035] Specifically, when the third rectangular plate 25 drives the second cylinder 24 to approach the tank body, the second cylinder 24 drives the first cylindrical rod 242 to contact both ends of the tank body, and at the same time the first cylindrical rod 242 slides into the second cylinder 24 and squeezes the spring 241 to prevent excessive squeezing of the tank body.

[0036] like Fig. 9 As shown, a first cylinder 131 is passed through and fixed in the middle of the two opposite gears 13, a cylindrical bar 34 is slidably arranged in the middle of the first cylinder 131, a second rectangular groove 341 is arranged at the upper end of the cylindrical bar 34, and the first cylinder 131 can slide in the second rectangular groove 341 through a slider.

[0037] Specifically, by driving the cylindrical bar 34 to rotate, the cylindrical bar 34 drives the two parallel gears 13 to rotate through the first cylinder 131, and at the same time, the rotating wheel 111 can be driven to move in the first arc plate 1. When it is necessary to drive the upper tank body and the lower tank body on both sides to move closer to the center at the same time, the gear 13 can slide on the outside of the cylindrical bar 34 through the first cylinder 131, and the first cylinder 131 slides in the second rectangular groove 341 through the slider, without affecting the rotation of the first cylinder 131 driven by the cylindrical bar 34.

[0038] like Figure 8 , Fig. 9 As shown, the two ends of the cylindrical bar 34 at the lower end are fixedly connected to the second rectangular bar 33 , and the two ends of the cylindrical bar 34 at the upper end are fixedly connected to the third rectangular bar 331 , and the third rectangular bar 331 can slide inside the second rectangular bar 33 .

[0039] Specifically, when the can needs to be taken, the second L-shaped block 144 at the upper end is driven to drive the first arc plate 1 at the upper end to slide upward, and the gear 13 at the upper end drives the cylindrical bar 34 to slide upward through the first cylinder 131, and the two ends of the cylindrical bar 34 drive the third rectangular bar 331 to slide upward in the second rectangular bar 33. Embodiment 2

[0040] like Figure 3 As shown, compared with Example 1, another embodiment of the present invention is: one end of the welding head 4 is slidably connected to the third cylinder 41, and the end of the third cylinder 41 away from the welding head 4 is fixedly connected to the fourth rectangular bar 42, and the lower end of the fourth rectangular bar 42 can slide on the slide rail 43, and the slide rail 43 is fixedly connected to the upper end of the base plate 3.

[0041] Specifically, after the upper tank body and the lower tank body are assembled, the sleeve, the base and the tank body are then assembled, and then the fourth rectangular bar 42 is driven to slide on the upper end of the slide rail 43, driving each welding head 4 to move to the weld between the upper tank body and the lower tank body, the weld between the shield and the tank body, and the weld between the base and the tube body. Then, the welding head 4 is driven to slide in the third cylinder 41, so that the output end of the welding head 4 is close to the weld, and then welding is performed.

[0042] Working principle: by driving the second L-shaped block 144 to slide upward from the first L-shaped block 143, the second L-shaped block 144 drives the first arc plate 1 to move upward through the first rectangular block 142, the first arc plate 1 drives the rotating wheel 111 to move through the first rectangular bar 11, and then the tank body is placed in the upper end of the rotating wheel 111 at the lower end, and then the second L-shaped block 144 is driven to slide inside the first L-shaped block 143, and the second L-shaped block 144 drives the first arc plate 1 to move downward through the first rectangular block 142, and the first arc plate 1 drives the rotating wheel 111 to move. The plate 1 drives the rotating wheel 111 downward through the first rectangular bar 11 to clamp and fix the tank body in the middle, and drives the gear 13 on one side to rotate to drive the gear 13 on the other side to rotate. The gears 13 on both sides rotate through the teeth 121 provided at one end of the connecting rod 12 to drive the connecting rod 12 to rotate. When the connecting rod 12 rotates, the first rectangular bars 11 on both sides are respectively driven to slide inside the first curved plate 1, and at the same time, each rotating wheel 111 can be driven to move inside the first curved plate 1, and the two rotating wheels 111 can be adjusted at the same time on the first curved plate 1 moves inside, the middle of the tank body can be clamped, and the circular plate 23 is driven to rotate in the disc 22. When the circular plate 23 rotates, the cylindrical block 232 is driven to slide in the first rectangular groove 221, and the cylindrical block 232 is made to slide in the arc hole 231, so that the cylindrical block 232 is simultaneously close to the edge of the sheath and the base until the sheath and the base are clamped. After the sheath and the base are clamped and fixed on one side of the disc 22, the third rectangular plates 25 on both sides are driven to slide on the second cylindrical rod 32 and slide toward the middle at the same time, and the third rectangular plates on one side are The plate 25 drives the second cylinder 24 to approach the upper tank body, and the third rectangular plate 25 on the other side drives the second cylinder 24 to approach the lower tank body, until the second cylinders 24 on both sides squeeze the upper tank body and the lower tank body toward the middle at the same time, so that the upper tank body and the lower tank body fit more closely, and then the second rectangular plates 21 on both sides are driven to drive the disc 22 to approach the upper tank body and the lower tank body at the same time, until the shield and the base are tightly attached to the two ends of the tank body, the various parts of the cylinder are combined together, and the various welds are tightly attached, and then welding is performed; Drive the fourth rectangular bar 42 to slide on the upper end of the slide rail 43, drive each welding head 4 to move to the weld between the upper tank body and the lower tank body, the weld between the shield and the tank body, and the weld between the base and the tube body, and then drive the welding head 4 to slide in the third cylinder 41, so that the output end of the welding head 4 is close to the weld, and then welding is performed.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic welding device for a liquefied gas cylinder, comprising a base plate (3), wherein two sets of first clamping assemblies are provided at the upper end of the base plate (3), characterized in that: The first clamping assembly comprises two first arc-shaped plates (1), the two first arc-shaped plates (1) can approach each other, two groups of the first clamping assembly can slide on the upper end of the bottom plate (3), a second clamping assembly is respectively provided on one side of the two groups of the first clamping assembly, the second clamping assembly comprises a first circular ring (2), a circular disk (22) is rotatably provided inside the first circular ring (2), a plurality of cylindrical blocks (232) are slidably provided on one side of the circular disk (22), the first circular ring (2) can slide on the upper end of the bottom plate (3), and a plurality of welding heads (4) are provided on one side of the upper end of the bottom plate (3).

2. The automatic welding equipment for liquefied gas cylinders according to claim 1 is characterized in that: First rectangular strips (11) are respectively slidably penetrated on both sides of the first arc-shaped plate (1), the two first rectangular strips (11) are (90) degrees apart, and rotating wheels (111) are rotatably provided at the ends of the first rectangular strips (11).

3. The automatic welding equipment for liquefied gas cylinders according to claim 2 is characterized in that: One end of the first rectangular bar (11) away from the rotating wheel (111) is rotatably connected to a connecting rod (12); one end of the connecting rod (12) away from the first rectangular bar (11) is rotatably connected to one side of the first arc-shaped plate (1) via a pin shaft; one end of the connecting rod (12) away from the first rectangular bar (11) is provided with a plurality of teeth (121); the teeth (121) are respectively meshed with gears (13); the two gears (13) are respectively rotatably connected to one side of the first arc-shaped plate (1) via a pin shaft; the two gears (13) are meshed with each other.

4. The automatic welding equipment for liquefied gas cylinders according to claim 3 is characterized by: Second rectangular blocks (31) are fixedly connected to both sides of the upper end of the bottom plate (3), a second cylindrical rod (32) is fixedly connected between the two second rectangular blocks (31), the outer side of the first arc-shaped plate (1) is fixedly connected to the second arc-shaped plate (141) through the first rectangular plate (14), the outer side of the second arc-shaped plate (141) is fixedly connected to the first rectangular block (142), the first rectangular block (142) located at the lower end is capable of sliding on the outer side of the second cylindrical rod (32), the first rectangular block (142) located at the lower end is fixedly connected to one side of the first rectangular block (142), the second L-shaped block (144) is fixedly connected to one side of the first rectangular block (142) located at the upper end, and the second L-shaped block (144) is capable of sliding inside the upper end of the first L-shaped block (143).

5. The automatic welding equipment for liquefied gas cylinders according to claim 4 is characterized in that: The second clamping assembly further comprises a circular plate (23) rotatably connected to the middle of the circular disc (22); a plurality of arc-shaped holes (231) are provided on the inner edge of the circular plate (23); the cylindrical block (232) is capable of sliding inside the arc-shaped holes (231); a second circular ring (233) is fixedly connected to one end of the cylindrical block (232) away from the circular plate (23); a first rectangular groove (221) is provided on a side of the circular disc (22) close to the circular plate (23) at a position corresponding to the cylindrical block (232); and the ends of the cylindrical block (232) are capable of sliding in the first rectangular groove (221).

6. The automatic welding equipment for liquefied gas cylinders according to claim 4 is characterized in that: A second rectangular plate (21) is fixedly connected to the lower end of the first circular ring (2), a second cylinder (24) is slidably arranged in the middle of each of the two circular disks (22), and a third rectangular plate (25) is fixedly connected to the ends of each of the second cylinders (24), and the third rectangular plate (25) and the second rectangular plate (21) are respectively capable of sliding on the outside of the second cylindrical rod (32).

7. The automatic welding equipment for liquefied gas cylinders according to claim 6 is characterized by: The interiors of the two second cylinders (24) are fixedly connected to the first cylindrical rod (242) via springs (241), and the first cylindrical rod (242) is capable of sliding inside the second cylinders (24).

8. The automatic welding equipment for liquefied gas cylinders according to claim 7 is characterized in that: A first cylinder (131) is passed through and fixed in the middle of the two opposing gears (13), a cylindrical bar (34) is slidably arranged in the middle of the first cylinder (131), a second rectangular groove (341) is arranged at the upper end of the cylindrical bar (34), and the first cylinder (131) can slide in the second rectangular groove (341) via a sliding block.

9. The automatic welding equipment for liquefied gas cylinders according to claim 8 is characterized in that: The two ends of the cylindrical bar (34) at the lower end are respectively fixedly connected to the second rectangular bar (33), and the two ends of the cylindrical bar (34) at the upper end are respectively fixedly connected to the third rectangular bar (331), and the third rectangular bar (331) can slide inside the second rectangular bar (33).

10. The automatic welding equipment for liquefied gas cylinders according to claim 1 is characterized in that: One end of the welding head (4) is slidably connected to a third cylinder (41), and one end of the third cylinder (41) away from the welding head (4) is fixedly connected to a fourth rectangular bar (42); the lower ends of the fourth rectangular bars (42) are respectively capable of sliding on a slide rail (43), and the slide rail (43) is fixedly connected to the upper end of the bottom plate (3).

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