Variable easy-to-process steel structure welding device and welding method

Abstract

The invention relates to the technical field of steel structure welding devices, and particularly discloses a variable easy-to-process steel structure welding device and welding method.The variable easy-to-process steel structure welding device comprises a main supporting rod, a welding gun head is slidably mounted from the left side to the interior of the main supporting rod, and U-shaped rods in a symmetrical state are slidably mounted on the lower end face of the main supporting rod; a sliding cavity is formed in the inner side face of the U-shaped rod. A rotating rod can be driven to rotate under the action of a second motor, so that the rotating rod can drive a U-shaped rod to rotate, the rotating rod can conform to an arc-shaped structure of a cylindrical steel structure in the rotating process, then the steel structures on the two sides of an opening can be in a horizontal state under the action of a pressing pump, and a reciprocating motor is started; in this way, the gear can drive the rack to rotate under the action of the second transmission shaft, so that the position of the opening of the steel structure can be moved according to the specified distance, and the situation that the steel structure is automatically restored during follow-up welding is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure welding devices, and in particular to a versatile and easy-to-handle steel structure welding device and a welding method. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. There are many sources of energy for modern welding, including gas flame, arc, laser, electron beam, friction and ultrasound. In addition to being used in factories, welding can also be carried out in a variety of environments, such as outdoors, underwater and in space. No matter where it is, welding may bring danger to the operator, so appropriate protective measures must be taken when welding.

[0003] At present, in the process of welding deformable steel structures, since the positions where the steel structures need to be welded may be misaligned or the spacing is too large, the operators are required to debug and adjust the places where the steel structures need to be welded many times during the welding process, which reduces the efficiency of the operation. Secondly, after manual adjustment, the steel structure will inevitably recover due to its own material characteristics, which will lead to automatic recovery during welding, thus affecting the welding effect.

[0004] Therefore, we propose a versatile and easy-to-handle steel structure welding device and welding method. Summary of the invention

[0005] The purpose of the present invention is to provide a versatile and easy-to-handle steel structure welding device and welding method to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a versatile and easy-to-handle steel structure welding device and welding method, comprising a main support rod, a welding gun head is slidably installed from the left side to the inside of the main support rod, a symmetrical U-shaped rod is slidably installed on the lower end surface of the main support rod, and a sliding cavity is opened on the inner side of the U-shaped rod; A rack is slidably mounted inside the sliding cavity, and pressing pumps facing opposite directions are fixedly mounted at both ends of the rack; A symmetrical reciprocating motor is fixedly mounted on the outer side of one end of the U-shaped rod close to the main support rod, a second transmission shaft is fixedly mounted on the output shaft of the reciprocating motor and located inside the U-shaped rod, and a gear matching the rack is fixedly mounted on the circumferential surface of the second transmission shaft; The gear and the adjacent rack are in a mutually meshing state, and a steel structure cylinder is slidably mounted on the inner side of the U-shaped rod.

[0007] Preferably, a groove is provided from the lower end surface of the main support rod to the inside, and a cross groove is provided from the left side surface of the main support rod to the inside, the upper end of the cross groove is in an open state, and the lower end and the groove are in a through state, and sliders are fixedly installed at both ends of the welding gun head, and the sliders are slidably installed on both sides of the inside of the cross groove, and the welding gun head is slidably installed inside the cross groove.

[0008] Preferably, an adjusting motor is fixedly installed on the right upper end of the main support rod, a first rotating rod is fixedly installed on the output shaft of the adjusting motor, a second rotating rod is rotatably installed on one end of the first rotating rod away from the adjusting motor, an end of the second rotating rod away from the first rotating rod is rotatably connected to the upper end of the welding gun head, and a cleaning hook is fixedly installed on the lower right side of the welding gun head.

[0009] Preferably, a first motor in a symmetrical state is fixedly installed on the right side surface of the lower end of the main support rod, a reciprocating screw is fixedly installed on the output shaft of the first motor, and a limit rod in a symmetrical state is fixedly installed on the right side surface of the lower end of the main support rod, and the limit rod and the reciprocating screw are in a horizontally symmetrical state.

[0010] Preferably, the circumferential surfaces of the reciprocating screw rod and the limiting rod are jointly provided with a T-shaped rod, a second motor is fixedly installed on the inner right part of the T-shaped rod, a rotating rod is fixedly installed on the output shaft of the second motor, and one end of the rotating rod away from the second motor is fixedly connected to the center position of the right side surface of the U-shaped rod.

[0011] Preferably, a sliding rod is fixedly installed on the lower right end of the main support rod, a cavity column is provided on the outer side of the lower end of the sliding rod, fixed rods are fixedly installed on both sides of the cavity column, a telescopic pump is rotatably installed on the inner side of the end of the fixed rod away from the cavity column, and the telescopic rod of the telescopic pump is rotatably connected to the outer side of the upper end of the sliding rod.

[0012] Preferably, a symmetrical connecting rod is fixedly installed on the outer side of the main support rod, an inner arc plate is fixedly installed on the outer side of the connecting rod, an outer arc plate is arranged on the outer side of the inner arc plate, a fixing plate is fixedly installed between two adjacent inner arc plates and outer arc plates, and the right side surfaces of the inner arc plate and the outer arc plate at the right end are in a fixed connection state.

[0013] Preferably, regulating pumps are evenly fixedly mounted in a circular array on the outer side surface of the outer arc plate, and an arc-shaped fixing plate is commonly fixedly mounted on the telescopic rods of two adjacent regulating pumps, and the arc-shaped fixing plate is located between the inner arc plate and the outer arc plate.

[0014] Preferably, a first frame is provided on the outer side of the steel structure cylinder, a second frame is provided on the right side of the first frame, auxiliary rollers are obliquely and rotatably installed on both sides of the upper parts of the first frame and the second frame, first mounting plates are fixedly installed on both sides of the first frame and the second frame, a main motor is fixedly installed on the outer sides of the two first mounting plates on the left side, a first transmission shaft is fixedly installed on the output shaft of the main motor, a first adjusting rod is fixedly installed on the circumferential surface of the first transmission shaft, the lower end of the first adjusting rod is rotatably installed on the upper part of the first mounting plate, and an adjusting wheel is rotatably installed on the upper end of the first adjusting rod, and the circumferential surface of the adjusting wheel can fit with the outer side surface of the steel structure cylinder.

[0015] Preferably, the multi-variable and easy-to-handle steel structure welding method comprises the following steps: Step 1: Place the steel structure cylinder on the upper part of the first frame, with the outer side facing the auxiliary roller; Step 2: Start the first motor, the output shaft of the first motor drives the reciprocating screw to rotate, and the T-shaped rod drives the second motor to move; Step 3: Start the second motor, the output shaft of the second motor drives the rotating rod to rotate, and the rotating rod drives the U-shaped rod to rotate; start the extrusion pump, and the telescopic rod of the extrusion pump fits the opening edge of the steel structure cylinder; Step 4: Start the reciprocating motor. The output shaft of the reciprocating motor rotates with the gear. The gear drives the rack to move. The rack moves the extrusion pump, and the opening of the steel structure cylinder fits. Step 5: The first motor rotates in the opposite direction, the steel structure cylinder moves to the upper part of the second frame, the welding gun head is started to weld the opening of the steel structure cylinder, the adjusting motor is started, the output shaft of the adjusting motor drives the first rotating rod to rotate, the first rotating rod drives the second rotating rod to rotate, and the second rotating rod drives the welding gun head and the main support rod to slide inside.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can rotate the rotating rod under the action of the second motor, so that the rotating rod can rotate with the U-shaped rod, and in the process of rotation, it can conform to the arc structure of the cylindrical steel structure. Then, under the action of the pressing pump, the steel structures on both sides of the opening can be in a horizontal state, and the reciprocating motor can be started, so that the gear can drive the rack to rotate under the action of the second transmission shaft, so that the position of the steel structure opening can be moved according to the specified spacing, thereby reducing the situation where the steel structure is in automatic recovery during subsequent welding.

[0017] 2. The present invention can repeatedly weld the opening of the steel structure under the action of the adjusting motor, the first rotating rod and the second rotating rod, and can clean the welding slag left by the welding under the action of the cleaning hook during the welding process, thereby ensuring the firmness of the secondary welding.

[0018] 3. The present invention can limit the steel structure cylinder under the action of the inner arc plate and the outer arc plate, and press the steel structure cylinder under the action of the regulating pump and the arc fixing plate, so as to prevent the steel structure cylinder from expanding outward during the movement or welding process and affecting the welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is the main structure diagram of the present invention; Figure 2 A schematic diagram of a first frame and a second frame of the present invention; Figure 3 Schematic diagram of the inner curved plate and the outer curved plate of the present invention; Figure 4 It is a schematic diagram of the main support rod of the present invention; Figure 5 It is a schematic diagram of the connecting rod and the arc-shaped fixing plate of the present invention; Figure 6 It is a schematic diagram of the structure of the first rotating rod and the second rotating rod of the present invention; Figure 7 It is a schematic diagram of the rotating rod of the present invention; Figure 8 It is a schematic diagram of a U-shaped rod of the present invention; Fig. 9 It is a schematic diagram of the U-shaped rod and the second transmission shaft of the present invention.

[0021] Description of reference numerals: 1. First frame; 2. Second frame; 3. Auxiliary roller; 4. First mounting plate; 5. Main motor; 6. First transmission shaft; 7. First adjustment rod; 8. Adjustment wheel; 9. Cavity column; 10. Fixed rod; 11. Telescopic pump; 12. Sliding rod; 13. Main support rod; 14. Groove; 15. Cross groove; 16. Connecting rod; 17. Inner arc plate; 18. Fixed plate; 19. Outer arc plate; 20. Adjusting pump; 21. Arc-shaped fixed plate; 22. Adjusting motor; 23. First rotating rod; 24. Second rotating rod; 25. Welding gun head; 26. Sliding block; 27. Cleaning hook; 28. First motor; 29. ​​Reciprocating screw rod; 30. Limiting rod; 31. T-shaped rod; 32. Second motor; 33. Rotating rod; 34. U-shaped rod; 35. Sliding cavity; 36. Rack; 37. Pressing pump; 38. Reciprocating motor; 39. Second transmission shaft; 40. Gear; 41. Steel structure cylinder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figures 1 to 9 , the present invention provides a technical solution: A versatile and easy-to-handle steel structure welding device and welding method, comprising a first frame 1 and a second frame 2, wherein the first frame 1 and the second frame 2 are rotatably mounted with inclined auxiliary rollers 3 on both sides of the upper part, and the auxiliary rollers 3 are used to assist the movement of a steel structure cylinder 41 to avoid friction between the steel structure cylinder 41 and the first frame 1 and the second frame 2, such as Figure 1 shown.

[0024] The first mounting plates 4 are fixedly installed at equal intervals on both sides of the first frame 1 and the second frame 2, and the first adjusting rod 7 is rotatably installed on the upper right side surface of the first mounting plate 4, and the main motor 5 is fixedly installed on the outer side surface of the two first mounting plates 4 on the left side, and the first transmission shaft 6 is fixedly installed on the output shaft of the main motor 5, and the first transmission shaft 6 is fixedly installed on the lower end of the first adjusting rod 7 in a horizontal state, and the upper right side surface of the first adjusting rod 7 is rotatably installed with an adjusting wheel 8, such as Figure 2 shown.

[0025] Start the main motor 5, the output shaft of the main motor 5 rotates with the first transmission shaft 6, the first transmission shaft 6 rotates with the first adjusting rod 7, the first adjusting rod 7 brings the adjusting wheel 8 to fit the outer side of the steel structure cylinder 41, so that the steel structure cylinder 41 is in a state of linear motion.

[0026] A cavity column 9 is arranged on the right side of the second frame 2, and symmetrical fixed rods 10 are fixedly installed on the front and rear sides of the cavity column 9, and a telescopic pump 11 is rotatably installed inside the outer side of the fixed rod 10, and a sliding rod 12 is rotatably installed on the telescopic rod of the telescopic pump 11, and the lower end of the sliding rod 12 is slidably installed inside the cavity column 9, as shown in FIG. Figure 4 shown.

[0027] During use, the telescopic pump 11 is started, and the telescopic rod of the telescopic pump 11 will slide with the sliding rod 12. At this time, the height of the sliding rod 12 will increase, so that it can move upward synchronously with the main support rod 13 fixedly connected to the top, and thus is suitable for welds of different heights that need to be welded.

[0028] A trapezoidal plate is fixedly mounted on the lower right end of the main support rod 13 for mounting a subsequent structure drive structure, such as Figure 6 As shown; a groove 14 is opened from the lower end surface of the main support rod 13 to the inside, and a cross groove 15 is opened from the left side to the inside. The top of the cross groove 15, that is, the top surface of the main support rod 13, is open, and the lower end of the cross groove 15 and the groove 14 are connected.

[0029] Secondly, connecting rods 16 are symmetrically fixedly installed on both sides of the main support rod 13, and inner arc plates 17 are fixedly installed on the outer sides of the two adjacent connecting rods 16 in front and behind. There are four inner arc plates 17, and outer arc plates 19 are arranged on the outer sides of the inner arc plates 17. The outer arc plate 19 on the far right is in a fixed connection with the right side of the inner arc plate 17, and fixing plates 18 are fixedly installed between the adjacent inner arc plates 17 and outer arc plates 19 to keep the inner arc plates 17 and the outer arc plates 19 in a stable state. Secondly, regulating pumps 20 are evenly fixedly installed in a circular array on the outer side of the outer arc plate 19. The regulating pumps 20 are grouped in pairs, and an arc-shaped fixing plate 21 is fixedly installed on the telescopic rod of the regulating pump 20 between the inner arc plate 17 and the outer arc plate 19, such as Figure 5 shown.

[0030] During use, the steel structure cylinder 41 will enter between the inner arc plate 17 and the outer arc plate 19. At this time, the inner arc plate 17 and the outer arc plate 19 can prevent the steel structure cylinder 41 from expanding outward, and avoid cracking at the welding point and changes in the spacing. Secondly, under the action of the regulating pump 20 and the arc fixing plate 21, the steel structure cylinder 41 can be further limited, further improving the steel structure cylinder 41 will not change.

[0031] An adjusting motor 22 is fixedly installed on the upper right side of the main support rod 13, and a first rotating rod 23 is rotatably installed on the output shaft of the adjusting motor 22, and a second rotating rod 24 is rotatably installed on the outer side of the left end of the first rotating rod 23, and a welding gun head 25 is rotatably installed on the left side of the second rotating rod 24, and the welding gun head 25 is slidably installed inside the cross groove 15, and sliders 26 are fixedly installed on both sides of the welding gun head 25, and the slider 26 is slidably installed inside the transverse U-shaped groove of the cross groove 15. Under the action of the slider 26 and the cross groove 15, the welding gun head 25 can perform linear motion, thereby realizing reciprocating welding of the required welding position, and under the action of the cleaning hook 27 fixedly installed on the right side of the welding gun head 25, the welding slag can be cleaned to avoid affecting the secondary welding and increase the aesthetics.

[0032] A first motor 28 is fixedly mounted on the right side of the lower trapezoidal plate of the main support rod 13, a reciprocating screw rod 29 is fixedly mounted on the output shaft of the first motor 28, and a limiting rod 30 of a circular structure is fixedly mounted on the left side of the trapezoidal rod below the reciprocating screw rod 29, and a T-shaped rod 31 is commonly arranged on the circumferential surfaces of the reciprocating screw rod 29 and the limiting rod 30, wherein the T-shaped rod 31 is threadedly rotatably connected to the reciprocating screw rod 29, a second motor 32 is fixedly mounted on the inner right end surface of the T-shaped rod 31, a rotating rod 33 is fixedly mounted on the output shaft of the second motor 32, and a U-shaped rod 34 is fixedly mounted on the left end of the rotating rod 33, as shown in FIG. Figure 7 and Figure 8 shown.

[0033] The upper and lower transverse straight rods of the U-shaped rod 34 are provided with four convex sliding cavities 35 from the front end face to the rear end face, and racks 36 are slidably installed inside the sliding cavities 35, and pressing pumps 37 are fixedly installed on both sides of the racks 36. Two reciprocating motors 38 are fixedly installed on the outer right end face of the U-shaped rod 34, and second transmission shafts 39 are fixedly installed on the output shafts of the reciprocating motors 38. Four gears 40 are fixedly installed on the output shafts of the second transmission shafts 39, and the gears 40 are meshed with adjacent racks 36, such as Figure 8 shown.

[0034] Therefore, during use, under the action of the reciprocating motor 38, the second transmission shaft 39 can rotate with the gear 40, so that the gear 40 can drive the rack 36 to move with the pressing pump 37, and in the process of movement, the opening of the steel structure cylinder 41 can gradually approach, so as to shorten the spacing of the opening of the steel structure cylinder 41.

[0035] Working principle: First, the steel structure cylinder 41 is placed inside the first frame 1 under the action of the gantry crane, and the main motor 5 is started. The output shaft of the main motor 5 drives the first transmission shaft 6 to rotate, and the first transmission shaft 6 drives the first adjusting rod 7 to rotate. The first adjusting rod 7 drives the adjusting wheel 8 to fit the outer side of the steel structure cylinder 41.

[0036] Secondly, start the first motor 28, the output shaft of the first motor 28 drives the reciprocating screw 29 to rotate, the reciprocating screw 29 drives the T-shaped rod 31 to move, the T-shaped rod 31 drives the second motor 32 to move synchronously, the second motor 32 drives the rotating rod 33, and the rotating rod 33 drives the U-shaped rod 34 to move synchronously.

[0037] The U-shaped rod 34 moves synchronously with the internal reciprocating motor 38 , gear 40 and other structures. At this time, the U-shaped rod 34 is located at the opening edge of the steel structure cylinder 41 .

[0038] The pressing pump 37 is started, and the telescopic rod of the pressing pump 37 fits with the opening edge of the steel structure cylinder 41. At this time, the opening of the steel structure cylinder 41 is in a horizontal state.

[0039] Start the reciprocating motor 38, the output shaft of the reciprocating motor 38 drives the second transmission shaft 39 to rotate, the second transmission shaft 39 drives the gear 40 to rotate, the gear 40 drives the rack 36 to rotate, and the rack 36 drives the pressing pump 37 to move, thereby reducing the opening spacing of the steel structure cylinder 41.

[0040] At this time, the first motor 28 rotates in the opposite direction, so that the steel structure cylinder 41 can enter the interior of the inner arc plate 17 and the outer arc plate 19 . At this time, the welding gun head 25 is started to weld the steel structure cylinder 41 .

[0041] Finally, start the adjusting motor 22, the output shaft of the adjusting motor 22 drives the first rotating rod 23 to rotate, the first rotating rod 23 drives the second rotating rod 24 to rotate synchronously, and the second rotating rod 24 drives the welding gun head 25 to move horizontally and linearly, so that the opening of the steel structure cylinder 41 can be repeatedly welded.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A versatile and easy-to-handle steel structure welding device, comprising a main support rod (13), characterized in that: A welding gun head (25) is slidably mounted on the left side of the main support rod (13) and the lower end surface of the main support rod (13) is slidably mounted with a symmetrical U-shaped rod (34), and the inner side surface of the U-shaped rod (34) is provided with a sliding cavity (35); A rack (36) is slidably mounted inside the sliding cavity (35), and pressing pumps (37) facing in opposite directions are fixedly mounted at both ends of the rack (36); A symmetrical reciprocating motor (38) is fixedly mounted on the outer side of one end of the U-shaped rod (34) close to the main support rod (13); a second transmission shaft (39) is fixedly mounted on the output shaft of the reciprocating motor (38) and located inside the U-shaped rod (34); a gear (40) matching the rack (36) is fixedly mounted on the circumferential surface of the second transmission shaft (39); The gear (40) and the adjacent rack (36) are in a mutually meshing state, and a steel structure cylinder (41) is slidably mounted on the inner side of the U-shaped rod (34).

2. A versatile and easy-to-handle steel structure welding device according to claim 1, characterized in that: A groove (14) is provided from the lower end surface of the main support rod (13) to the inside, a cross groove (15) is provided from the left side surface of the main support rod (13) to the inside, the upper end of the cross groove (15) is in an open state, and the lower end and the groove (14) are in a through state, and sliders (26) are fixedly installed at both ends of the welding gun head (25), the sliders (26) are slidably installed on both sides of the inside of the cross groove (15), and the welding gun head (25) is slidably installed inside the cross groove (15).

3. A versatile and easy-to-handle steel structure welding device according to claim 1, characterized in that: An adjusting motor (22) is fixedly mounted on the right upper end of the main support rod (13); a first rotating rod (23) is fixedly mounted on the output shaft of the adjusting motor (22); a second rotating rod (24) is rotatably mounted on one end of the first rotating rod (23) away from the adjusting motor (22); an end of the second rotating rod (24) away from the first rotating rod (23) is rotatably connected to the upper end of a welding gun head (25); and a cleaning hook (27) is fixedly mounted on the lower right side of the welding gun head (25).

4. The versatile and easy-to-handle steel structure welding device according to claim 1, characterized in that: A first motor (28) is fixedly mounted on the right side surface of the lower end of the main support rod (13) in a symmetrical state, a reciprocating screw rod (29) is fixedly mounted on the output shaft of the first motor (28), and a limit rod (30) is fixedly mounted on the right side surface of the lower end of the main support rod (13) in a symmetrical state, the limit rod (30) and the reciprocating screw rod (29) being in a horizontally symmetrical state.

5. A versatile and easy-to-handle steel structure welding device according to claim 4, characterized in that: The circumferential surfaces of the reciprocating screw rod (29) and the limiting rod (30) are jointly provided with a T-shaped rod (31); a second motor (32) is fixedly mounted on the inner right portion of the T-shaped rod (31); a rotating rod (33) is fixedly mounted on the output shaft of the second motor (32); and an end of the rotating rod (33) away from the second motor (32) is fixedly connected to the center position of the right side surface of the U-shaped rod (34).

6. A versatile and easy-to-handle steel structure welding device according to claim 5, characterized in that: A sliding rod (12) is fixedly mounted on the lower right end of the main support rod (13); a cavity column (9) is arranged on the outer side of the lower end of the sliding rod (12); fixed rods (10) are fixedly mounted on both sides of the cavity column (9); a telescopic pump (11) is rotatably mounted on the inner side of one end of the fixed rod (10) away from the cavity column (9); the telescopic rod of the telescopic pump (11) is rotatably connected to the outer side of the upper end of the sliding rod (12).

7. A versatile and easy-to-handle steel structure welding device according to claim 6, characterized in that: A symmetrical connecting rod (16) is fixedly mounted on the outer side of the main support rod (13), an inner arc plate (17) is fixedly mounted on the outer side of the connecting rod (16), an outer arc plate (19) is arranged on the outer side of the inner arc plate (17), and a fixing plate (18) is fixedly mounted between two adjacent inner arc plates (17) and outer arc plates (19), and the right side surfaces of the inner arc plate (17) and the outer arc plate (19) at the right end are in a fixed connection state.

8. A versatile and easy-to-handle steel structure welding device according to claim 7, characterized in that: The outer side surface of the outer arc plate (19) is evenly and fixedly mounted with regulating pumps (20) in an annular array, and the telescopic rods of two adjacent regulating pumps (20) are commonly and fixedly mounted with an arc-shaped fixing plate (21), and the arc-shaped fixing plate (21) is located between the inner arc plate (17) and the outer arc plate (19).

9. The versatile and easy-to-handle steel structure welding device according to claim 1, characterized in that: A first frame (1) is arranged on the outer side of the steel structure cylinder (41), a second frame (2) is arranged on the right side of the first frame (1), auxiliary rollers (3) are obliquely and rotatably mounted on both sides of the upper parts of the first frame (1) and the second frame (2), first mounting plates (4) are fixedly mounted on both sides of the first frame (1) and the second frame (2), a main motor (5) is fixedly mounted on the outer side of the two first mounting plates (4) on the left side, a first transmission shaft (6) is fixedly mounted on the output shaft of the main motor (5), a first adjustment rod (7) is fixedly mounted on the circumferential surface of the first transmission shaft (6), the lower end of the first adjustment rod (7) is rotatably mounted on the upper part of the first mounting plate (4), the upper end of the first adjustment rod (7) is rotatably mounted on the upper part of the first mounting plate (4), the circumferential surface of the adjustment wheel (8) can fit with the outer side surface of the steel structure cylinder (41).

10. A method for welding a flexible and easy-to-handle steel structure, referring to a welding device for welding a flexible and easy-to-handle steel structure as claimed in any one of claims 1 to 9, characterized in that: The multi-variable and easy-to-handle steel structure welding method comprises the following steps: Step 1: Place the steel structure cylinder (41) on the upper part of the first frame (1), with the outer side surface and the auxiliary roller (3) in contact; Step 2: starting the first motor (28), the output shaft of the first motor (28) drives the reciprocating screw rod (29) to rotate, and the T-shaped rod (31) drives the second motor (32) to move; Step 3: Start the second motor (32), the output shaft of the second motor (32) drives the rotating rod (33) to rotate, and the rotating rod (33) drives the U-shaped rod (34) to rotate; start the extrusion pump (37), and the telescopic rod of the extrusion pump (37) fits with the opening edge of the steel structure cylinder (41); Step 4: Start the reciprocating motor (38), the output shaft of the reciprocating motor (38) drives the gear (40) to rotate, the gear (40) drives the rack (36) to move, the rack (36) drives the extrusion pump (37) to move, and the opening of the steel structure cylinder (41) fits; Step 5: The first motor (28) rotates in the opposite direction, the steel structure cylinder (41) moves to the upper part of the second frame (2), the welding gun head (25) is started to weld the opening of the steel structure cylinder (41), the adjustment motor (22) is started, the output shaft of the adjustment motor (22) drives the first rotating rod (23) to rotate, the first rotating rod (23) drives the second rotating rod (24) to rotate, and the second rotating rod (24) drives the welding gun head (25) and the main support rod (13) to slide inside.

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