Welding device and welding method for advertising board machining

Abstract

The invention relates to the field of advertising board welding equipment, and discloses a welding device and method for advertising board machining. The welding device comprises a supporting frame, a fixing platform, an operating platform, a negative pressure assembly, two connecting plates, a fixing assembly, an adjusting assembly and a welding assembly; the advertising board is pressed on the operation platform through the negative pressure assembly; after the fixing assembly is adjusted to the corresponding angle where the circular pipe needs to be welded to the advertising board through the adjusting assembly, the circular pipe penetrates through the fixing assembly, the end of the circular pipe makes contact with the welding position of the advertising board by moving the operation platform, then the circular pipe is locked through the fixing assembly, and at the moment, the circular pipe and the advertising board are both fixed and cannot move; the welding spatter is prevented from being increased, the risk that an operator is scalded by spatter is reduced, the whole welding operation can be completed by only one person in the whole process, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of billboard welding equipment, and in particular to a billboard processing welding device and a welding method. Background Art

[0002] Billboards installed outdoors or at high places need to be connected very firmly, so during installation, the billboards will be welded directly to the bracket to avoid safety accidents.

[0003] Chinese patent 201911184018.0 discloses a hand-held welding device for outdoor billboards, in which the inner hole of the outer shell is mounted on the billboard round tube, and the hydraulic station is controlled by the central control box to open. The hydraulic station controls the hydraulic rod through the hydraulic hose to drive the movable plate, the welding machine and the welding gun to move downward. After the bottom end of the welding gun approaches the outer wall of the round tube and reaches the working position, the welding machine is turned on, and the welding gun welds the round tube and the billboard. At the same time, the central control box controls to turn on the first motor, so that the reducer drives the gear to rotate, and the gear drives the installation box, the hydraulic rod, the movable plate, the welding machine and the welding gun to rotate through the gear row, and the welding gun performs circumferential welding on the connection between the outer wall of the round tube and the billboard.

[0004] However, during the welding process, the human body cannot remain still while holding the billboard and the round tube. During the welding process, the billboard and the round tube may move unstably, which is likely to cause an increase in welding spatter, greatly increasing the risk of operators being burned by the spatter. In addition, when the human body holds the billboard to weld multiple round tubes, it is necessary to complete the welding of one round tube before welding another round tube. The welding efficiency is low, and there is no guarantee that the two round tubes are in a parallel position after welding, so that after installation, the round tube cannot stably support the billboard. Summary of the invention

[0005] The purpose of the present invention is to provide a welding device and a welding method for billboard processing to solve the following technical problems:

[0006] How to reduce the risk of welding spatter during the welding process of billboards and round tubes, and improve the efficiency of welding multiple round tubes.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A welding device for billboard processing is suitable for welding a round tube to a billboard; the welding device comprises a support frame, and the support frame is provided with:

[0009] A fixed platform, fixedly arranged on the supporting frame;

[0010] An operating platform, which is slidably arranged on a fixed platform;

[0011] A negative pressure assembly, used to negatively pressurize the billboard on the operating platform;

[0012] Two connecting plates are fixedly arranged at both ends of the fixed platform and are located on both sides of the operating platform;

[0013] A fixing assembly is arranged above the operating platform, and both ends of the fixing assembly are rotatably connected to a connecting plate respectively; the fixing assembly is used to fix the round tube;

[0014] An adjusting component, connected to the fixing component, and used for adjusting the angle of the fixing component;

[0015] The welding assembly is arranged on one of the connecting plates and is used for welding the round tube to the billboard.

[0016] As a further solution of the present invention: the fixing assembly comprises:

[0017] Two L-shaped rotating rods are arranged between the two connecting plates and are respectively located on both sides of the operating platform; the L-shaped rotating rods correspond to the connecting plates one by one; one end of the L-shaped rotating rod is rotatably connected to the corresponding connecting plate; the adjusting assembly is connected to the L-shaped rotating rod;

[0018] A first connecting rod is fixedly connected to the other ends of the two L-shaped rotating rods; a plurality of first limiting holes are formed on the first connecting rod;

[0019] A second connecting rod is fixedly connected to the two L-shaped rotating rods and is arranged in parallel with the first connecting rod; a plurality of second limiting holes are formed on the second connecting rod; the first limiting holes correspond to the second limiting holes one by one, and the first limiting holes and the corresponding second limiting holes are on the same straight line;

[0020] A plurality of locking components correspond to the first limiting holes one by one, and the locking components are arranged between the corresponding first limiting holes and the second limiting holes for locking the round tube.

[0021] As a further solution of the present invention: the locking assembly comprises:

[0022] An internal fixing tube, wherein the internal fixing tube is fixedly disposed between the corresponding first limiting hole and the second limiting hole;

[0023] The outer rotating tube corresponds to the inner fixed tube one by one, the outer rotating tube is sleeved outside the corresponding inner fixed tube, and is rotatably connected to the first connecting rod and the second connecting rod;

[0024] A plurality of limiting units are respectively connected to the inner fixed tube and the outer rotating tube, and are used for limiting the circular tube simultaneously when the outer rotating tube is rotated;

[0025] The locking unit is arranged at one end of the outer rotating tube and is used for locking the outer rotating tube.

[0026] As a further solution of the present invention: the limiting unit includes:

[0027] A plurality of No. 1 limiting rods are rotatably arranged in a circular array inside the outer rotating tube;

[0028] A plurality of through slots, corresponding one to one with the first limiting rod, are arranged on the inner fixing tube in a circular array;

[0029] A plurality of No. 2 limit rods correspond to the through slots one by one and are rotatably arranged in the corresponding through slots respectively; a sliding slot is provided at one end of the No. 2 limit rod close to the No. 1 limit rod; one end of the No. 1 limit rod is located in the sliding slot; a first spring is arranged between the No. 1 limit rod and the No. 2 limit rod.

[0030] As a further solution of the present invention: the locking unit comprises:

[0031] A plurality of limiting grooves are provided on the outer rotating tube in a circumferential array;

[0032] A C-shaped lock buckle, one end of which is rotatably connected to the first connecting rod; the C-shaped lock buckle is plug-connected to one of the limiting grooves; a second spring is arranged between the C-shaped lock buckle and the first connecting rod.

[0033] As a further solution of the present invention: the adjustment component includes:

[0034] Two No. 1 gears, corresponding to the L-shaped rotating rods one by one; the No. 1 gears are fixedly connected to the corresponding L-shaped rotating rods and are rotatably connected to the corresponding connecting plates;

[0035] Two No. 2 gears correspond to the No. 1 gear one by one; the No. 1 gear is meshed and connected with the corresponding No. 2 gear and is rotatably connected with the connecting plate

[0036] A rotating shaft, fixedly connected to the two No. 2 gears;

[0037] The motor is fixedly connected to the connecting plate, and the output end of the motor is fixedly connected to the rotating shaft.

[0038] As a further solution of the present invention: the operating platform is hollow inside and has an open bottom; the bottom of the operating platform is in close contact with the fixed platform;

[0039] The negative pressure component comprises:

[0040] Multiple negative pressure holes are evenly distributed on the operating platform

[0041] The air pump is arranged in the middle of the fixed platform and is communicated with the bottom of the operating platform.

[0042] A welding method for billboard processing, the welding method comprising the following steps:

[0043] S1: Place the billboard on the operating platform;

[0044] S2: negative pressure is applied to the billboard on the operating platform through the negative pressure component;

[0045] S3: Adjust the fixing component to the corresponding angle at which the round tube needs to be welded on the billboard by adjusting the component;

[0046] S4: passing the round tube through the fixing assembly;

[0047] S5: Move the operating platform to bring the end of the round tube into contact with the welding position of the billboard.

[0048] S6: Lock the round tube by fixing the assembly;

[0049] S7: Weld the round tube to the billboard using a welding assembly.

[0050] Beneficial effects of the present invention:

[0051] (1) The present invention places the billboard on the operating platform, and applies negative pressure to the billboard on the operating platform through a negative pressure component; then, the fixing component is adjusted to the corresponding angle at which the round tube needs to be welded on the billboard through the adjusting component, and the round tube is passed through the fixing component. The end of the round tube is brought into contact with the welding position of the billboard through the moving operating platform, and then the round tube is locked through the fixing component. At this time, the round tube and the billboard are both fixed and cannot be moved, and the welding position of the round tube and the billboard is welded through the welding component; the round tube can be fixed to the billboard at any required angle through the adjusting component and the fixing component, and there is no need to manually support the billboard and the round tube. During the welding process, the billboard and the round tube will not move, thereby avoiding an increase in welding spatter and reducing the risk of operators being scalded by spatter. Only one person is needed to complete the entire welding operation, thereby reducing labor costs;

[0052] (2) The present invention drives the L-shaped rotating rod to rotate through the adjustment component, so that the L-shaped rotating rod and the billboard on the operating platform are at a specified angle under negative pressure, and then the round tube is inserted into the appropriate first limit hole and the corresponding second limit hole. After the round tube contacts the billboard, the round tube is locked by the locking component and welding is performed. Before welding, the round tube can be inserted into different first limit holes and corresponding second limit holes and locked. One person can also continuously weld multiple round tubes, thereby improving welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention will be further described below in conjunction with the accompanying drawings.

[0054] Figure 1 The main structure of an embodiment of the present invention is shown in FIG. Figure 1 ;

[0055] Figure 2 The main structure of an embodiment of the present invention is shown in FIG. Figure 2 ;

[0056] Figure 3 for Figure 2 A local enlarged view of point A;

[0057] Figure 4 A partial structural schematic diagram of an embodiment of the present invention;

[0058] Figure 5 This is a schematic diagram of the structure of a fixing component according to an embodiment of the present invention;

[0059] Figure 6 It is a partial structural schematic diagram of a fixing component according to an embodiment of the present invention;

[0060] Figure 7 This is a schematic diagram of the outer rotating tube structure of an embodiment of the present invention;

[0061] Figure 8 This is a cross-sectional view of the outer rotating tube structure of an embodiment of the present invention.

[0062] Description of the drawings: 1. Support frame; 2. Fixed platform; 3. Operating platform; 4. Negative pressure assembly; 41. Negative pressure hole; 42. Vacuum pump; 5. Connecting plate; 6. Fixed assembly; 61. L-shaped rotating rod; 62. First connecting rod; 63. First limiting hole; 64. Second connecting rod; 65. Second limiting hole; 66. Locking assembly; 661. Internal fixed tube; 662. External rotating tube; 663. Limiting unit; 6631. Limiting rod No. 1; 6632. Through groove; 6633. Limiting rod No. 2; 664. Locking unit; 6641. Limiting groove; 6642. C-shaped lock; 7. Adjusting assembly; 71. Gear No. 1; 72. Gear No. 2; 73. Rotating shaft; 74. Motor; 8. Welding assembly; 81. Welding control box; 82. Connecting line; 83. Handheld welding gun. DETAILED DESCRIPTION

[0063] 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.

[0064] See also Figure 1 As shown, in one embodiment, a welding device for billboard processing is provided, which is suitable for welding a round tube to a billboard; the welding device comprises a support frame 1, and the support frame 1 is provided with:

[0065] A fixed platform 2 is fixedly arranged on the support frame 1;

[0066] An operating platform 3 is slidably arranged on the fixed platform 2;

[0067] A negative pressure assembly 4 is used to apply negative pressure to the billboard on the operating platform 3;

[0068] Two connecting plates 5 are fixedly arranged at both ends of the fixed platform 2 and located on both sides of the operating platform 3;

[0069] The fixing component 6 is arranged above the operating platform 3, and both ends of the fixing component 6 are rotatably connected to a connecting plate 5 respectively; the fixing component 6 is used to fix the round tube;

[0070] An adjusting component 7, connected to the fixing component 6, and used for adjusting the angle of the fixing component 6;

[0071] A welding assembly 8, arranged on one of the connecting plates 5, for welding the round tube to the billboard;

[0072] Through the above technical scheme, this embodiment places the billboard on the operating platform 3, and negatively presses the billboard on the operating platform 3 through the negative pressure component 4; then adjusts the fixing component 6 to the corresponding angle at which the round tube needs to be welded on the billboard through the adjusting component 7, and then passes the round tube through the fixing component 6, and contacts the end of the round tube with the welding position of the billboard by moving the operating platform 3, and then locks the round tube through the fixing component 6. At this time, the round tube and the billboard are both fixed and cannot be moved, and the welding position of the round tube and the billboard is welded by the welding component 8; the round tube can be fixed to the billboard at any required angle through the adjusting component 7 and the fixing component 6, and there is no need to manually support the billboard and the round tube. During the welding process, the billboard and the round tube will not move, thereby avoiding an increase in welding spatter and reducing the risk of operators being scalded by spatter. Only one person is needed to complete the entire welding operation, thereby reducing labor costs.

[0073] As an embodiment of the present invention, please refer to Figure 2 , Figure 5 and Figure 6 As shown, the fixing assembly 6 includes:

[0074] Two L-shaped rotating rods 61 are arranged between the two connecting plates 5 and are respectively located on both sides of the operating platform 3; the L-shaped rotating rods 61 correspond to the connecting plates 5 one by one; one end of the L-shaped rotating rod 61 is rotatably connected to the corresponding connecting plate 5; the adjusting assembly 7 is connected to the L-shaped rotating rod 61;

[0075] A first connecting rod 62 is fixedly connected to the other ends of the two L-shaped rotating rods 61; a plurality of first limiting holes 63 are formed on the first connecting rod 62;

[0076] The second connecting rod 64 is fixedly connected to the two L-shaped rotating rods 61 and is arranged in parallel with the first connecting rod 62. The second connecting rod 64 is provided with a plurality of second limiting holes 65. The first limiting holes 63 and the second limiting holes 65 correspond to each other one by one, and the first limiting holes 63 and the corresponding second limiting holes 65 are on the same straight line.

[0077] A plurality of locking components 66 corresponding to the first limiting holes 63 one by one, wherein the locking components 66 are arranged between the corresponding first limiting holes 63 and the second limiting holes 65, and are used to lock the round tube;

[0078] Through the above technical scheme, this embodiment drives the L-shaped rotating rod 61 to rotate through the adjustment component 7, so that the L-shaped rotating rod 61 is at a specified angle with the billboard under negative pressure on the operating platform 3, and then the round tube is inserted into the appropriate first limiting hole 63 and the corresponding second limiting hole 65. After the round tube contacts the billboard, the round tube is locked by the locking component 66 and then welding is performed. Before welding, the round tube can be inserted into different first limiting holes 63 and corresponding second limiting holes 65 and locked. One person can also continuously weld multiple round tubes, which improves welding efficiency and ensures that the two round tubes are in a parallel position after welding, so that after installation, the round tube can stably support the billboard.

[0079] As an embodiment of the present invention, please refer to Figure 3 , Figure 7 and Figure 8 As shown, the locking assembly 66 includes:

[0080] An inner fixing tube 661, wherein the inner fixing tube 661 is fixedly disposed between the corresponding first limiting hole 63 and the second limiting hole 65;

[0081] The outer rotating tube 662 corresponds to the inner fixed tube 661 one by one. The outer rotating tube 662 is sleeved outside the corresponding inner fixed tube 661 and is rotatably connected to the first connecting rod 62 and the second connecting rod 64;

[0082] A plurality of limiting units 663 are respectively connected to the inner fixed tube 661 and the outer rotating tube 662, and are used for limiting the position of the circular tube by the plurality of limiting units 663 at the same time when the outer rotating tube 662 is rotated;

[0083] A locking unit 664, disposed at one end of the outer rotating tube 662, for locking the outer rotating tube 662;

[0084] Through the above technical solution, after the round tube is inserted into the first limiting hole 63 and the second limiting hole 65, the outer rotating tube 662 is rotated, and multiple limiting units 663 simultaneously limit the round tube at multiple points, and then the outer rotating tube 662 is locked by the locking unit 664 to prevent the outer rotating tube 662 from rotating. This can achieve the fixation of round tubes of different thicknesses, prevent the round tube from moving during the welding process, avoid increasing welding spatter, and reduce the risk of operators being scalded by spatter.

[0085] As an embodiment of the present invention, please refer to Figure 8 As shown, the limiting unit 663 includes:

[0086] A plurality of first-number limiting rods 6631 are rotatably arranged in a circular array inside the outer rotating tube 662;

[0087] A plurality of through slots 6632 corresponding to the first limiting rods 6631 one by one, and arranged in a circular array on the inner fixing tube 661;

[0088] A plurality of No. 2 limiting rods 6633 correspond to the through slots 6632 one by one and are rotatably arranged in the corresponding through slots 6632 respectively; a sliding slot is provided at one end of the No. 2 limiting rod 6633 close to the No. 1 limiting rod 6631; one end of the No. 1 limiting rod 6631 is located in the sliding slot; a first spring is arranged between the No. 1 limiting rod 6631 and the No. 2 limiting rod 6633;

[0089] Through the above technical scheme, this embodiment rotates the outer rotating tube 662, and the outer rotating tube 662 drives multiple No. 1 limit rods 6631 to rotate, and multiple No. 1 limit rods 6631 drive the corresponding No. 2 limit rods 6633 to rotate, and multiple No. 2 limit rods 6633 fix the round tube; multiple limit units 663 simultaneously fix the round tube at multiple points, so as to fix round tubes of different thicknesses, avoid the movement of the round tube during the welding process, avoid the increase of welding spatter, and reduce the risk of operators being burned by spatter.

[0090] As an embodiment of the present invention, please refer to Figure 3 , Figure 7 and Figure 8 As shown, the locking unit 664 includes:

[0091] A plurality of limiting grooves 6641 are provided on the outer rotating tube 662 in a circular array;

[0092] A C-shaped lock buckle 6642, one end of which is rotatably connected to the first connecting rod 62; the C-shaped lock buckle 6642 is plug-engaged with one of the limiting grooves 6641; a second spring is provided between the C-shaped lock buckle 6642 and the first connecting rod 62;

[0093] Through the above technical solution, this embodiment locks the C-shaped lock buckle 6642 in one of the limit grooves 6641 through the second spring, thereby locking the outer rotating tube 662, fixing the round tube to prevent the round tube from moving during the welding process, avoiding an increase in welding spatter, and reducing the risk of operators being burned by spatter.

[0094] As an embodiment of the present invention, please refer to Figure 1-Figure 3 As shown, the adjustment component 7 includes:

[0095] Two first gears 71 correspond to the L-shaped rotating rods 61 one by one; the first gears 71 are fixedly connected to the corresponding L-shaped rotating rods 61 and are rotatably connected to the corresponding connecting plates 5;

[0096] The two second gears 72 correspond to the first gear 71 one by one; the first gear 71 is meshed and connected with the corresponding second gear 72, and is rotatably connected with the connecting plate 5

[0097] The rotating shaft 73 is fixedly connected to the two second gears 72;

[0098] The motor 74 is fixedly connected to the connecting plate 5, and the output end of the motor 74 is fixedly connected to the rotating shaft 73;

[0099] Through the above technical solution, this embodiment starts the motor 74, and the motor 74 drives the rotating shaft 73, the second gear 72, and the first gear 71 to drive the L-shaped rotating rod 61 to rotate, thereby adjusting the angular position of the L-shaped rotating rod 61 and the billboard.

[0100] As an embodiment of the present invention, please refer to Figure 2 and Figure 4 As shown, the operating platform 3 is hollow inside and has an open bottom; the bottom of the operating platform 3 is in close contact with the fixed platform 2;

[0101] The negative pressure component 4 comprises:

[0102] Multiple negative pressure holes 41 are evenly arranged on the operating platform 3

[0103] The vacuum pump 42 is arranged in the middle of the fixed platform 2 and is connected to the bottom of the operating platform 3;

[0104] Through the above technical scheme, the length of the operating platform 3 of this embodiment is greater than half the length of the fixed platform 2, so that when the operating platform 3 moves on the fixed platform 2, the vacuum pump 42 is always connected to the bottom of the operating platform 3, and the gas in the operating platform 3 is extracted by starting the vacuum pump 42, and the billboard is negatively pressurized on the operating platform 3 through the negative pressure hole 41; after the billboard is fixed on the operating platform 3, the upper surface of the billboard is not blocked, which is convenient for the staff to perform welding operations.

[0105] As an embodiment of the present invention, please refer to Figure 2 As shown, the welding assembly 8 includes a welding control box 81, a connecting line 82 and a handheld welding gun 83;

[0106] Through the above technical solution, the staff of this embodiment welds the billboard and the bracket by holding the welding gun 83.

[0107] Moving components are arranged on both sides of the operating platform 3 for driving the operating platform 3 to move; the moving components are prior art and will not be described in detail here.

[0108] A welding method for billboard processing, the welding method comprising the following steps:

[0109] S1: Place the billboard on the operating platform;

[0110] S2: negative pressure is applied to the billboard on the operating platform through the negative pressure component;

[0111] S3: Adjust the fixing component to the corresponding angle at which the round tube needs to be welded on the billboard by adjusting the component;

[0112] S4: passing the round tube through the fixing assembly;

[0113] S5: Move the operating platform to bring the end of the round tube into contact with the welding position of the billboard.

[0114] S6: Lock the round tube by fixing the assembly;

[0115] S7: Weld the round tube to the billboard using a welding assembly.

[0116] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A welding device for billboard processing, suitable for welding a round tube to a billboard; the welding device comprises a support frame (1), characterized in that: The support frame (1) is provided with: A fixed platform (2) is fixedly arranged on the support frame (1); An operating platform (3) is slidably arranged on the fixed platform (2); A negative pressure assembly (4) for applying negative pressure to the billboard on the operating platform (3); Two connecting plates (5) are fixedly arranged at both ends of the fixed platform (2) and are located on both sides of the operating platform (3); A fixing component (6) is arranged above the operating platform (3), and both ends of the fixing component (6) are rotatably connected to a connecting plate (5) respectively; the fixing component (6) is used to fix the round tube; An adjusting component (7) connected to the fixing component (6) and used for adjusting the angle of the fixing component (6); A welding assembly (8) is arranged on one of the connecting plates (5) and is used for welding the round tube to the billboard.

2. A welding device for billboard processing according to claim 1, characterized in that: The fixing assembly (6) comprises: Two L-shaped rotating rods (61) are arranged between the two connecting plates (5) and are respectively located on both sides of the operating platform (3); the L-shaped rotating rods (61) correspond to the connecting plates (5) one by one; one end of the L-shaped rotating rod (61) is rotatably connected to the corresponding connecting plate (5); the adjusting assembly (7) is connected to the L-shaped rotating rod (61); A first connecting rod (62) is fixedly connected to the other ends of the two L-shaped rotating rods (61); a plurality of first limiting holes (63) are formed on the first connecting rod (62); The second connecting rod (64) is fixedly connected to the two L-shaped rotating rods (61); and is arranged in parallel with the first connecting rod (62); a plurality of second limiting holes (65) are formed on the second connecting rod (64); the first limiting holes (63) and the second limiting holes (65) correspond one to one, and the first limiting holes (63) and the corresponding second limiting holes (65) are on the same straight line; A plurality of locking components (66) correspond one to one with the first limiting holes (63); the locking components (66) are arranged between the corresponding first limiting holes (63) and the second limiting holes (65) and are used to lock the round tube.

3. A welding device for billboard processing according to claim 2, characterized in that: The locking assembly (66) comprises: An internal fixing tube (661), wherein the internal fixing tube (661) is fixedly disposed between the corresponding first limiting hole (63) and the second limiting hole (65); The outer rotating tube (662) corresponds to the inner fixed tube (661) one by one. The outer rotating tube (662) is sleeved on the outside of the corresponding inner fixed tube (661) and is rotatably connected to the first connecting rod (62) and the second connecting rod (64); A plurality of limiting units (663) are respectively connected to the inner fixed tube (661) and the outer rotating tube (662), and are used for limiting the position of the circular tube simultaneously when the outer rotating tube (662) is rotated; The locking unit (664) is disposed at one end of the outer rotating tube (662) and is used to lock the outer rotating tube (662).

4. A welding device for billboard processing according to claim 3, characterized in that: The limiting unit (663) comprises: A plurality of No. 1 limiting rods (6631) are rotatably arranged in a circular array inside the outer rotating tube (662); A plurality of through slots (6632), corresponding one to one with the first limiting rod (6631), are arranged in a circular array on the inner fixing tube (661); A plurality of No. 2 limiting rods (6633) correspond to the through slots (6632) one by one and are rotatably arranged in the corresponding through slots (6632) respectively; a sliding slot is provided at one end of the No. 2 limiting rod (6633) close to the No. 1 limiting rod (6631); one end of the No. 1 limiting rod (6631) is located in the sliding slot; a first spring is arranged between the No. 1 limiting rod (6631) and the No. 2 limiting rod (6633).

5. A welding device for billboard processing according to claim 4, characterized in that: The locking unit (664) comprises: A plurality of limiting grooves (6641) are arranged in a circular array on the outer rotating tube (662); A C-shaped lock buckle (6642), one end of which is rotatably connected to the first connecting rod (62); the C-shaped lock buckle (6642) is plug-engaged with one of the limiting grooves (6641); and a second spring is provided between the C-shaped lock buckle (6642) and the first connecting rod (62).

6. A welding device for billboard processing according to claim 5, characterized in that: The regulating component (7) comprises: Two first gears (71) correspond to the L-shaped rotating rods (61) one by one; the first gears (71) are fixedly connected to the corresponding L-shaped rotating rods (61) and are rotationally connected to the corresponding connecting plates (5); Two No. 2 gears (72) correspond to the No. 1 gear (71) one by one; the No. 1 gear (71) is meshedly connected with the corresponding No. 2 gear (72) and is rotationally connected with the connecting plate (5) A rotating shaft (73) is fixedly connected to the two second gears (72); The motor (74) is fixedly connected to the connecting plate (5), and the output end of the motor (74) is fixedly connected to the rotating shaft (73).

7. A welding device for billboard processing according to claim 6, characterized in that: The operating platform (3) is hollow inside and has an open bottom; the bottom of the operating platform (3) is in close contact with the fixed platform (2); The negative pressure component (4) comprises: Multiple negative pressure holes (41) are evenly arranged on the operating platform (3) The air pump (42) is arranged in the middle of the fixed platform (2) and is connected to the bottom of the operating platform (3).

8. A welding method for billboard processing, applicable to a welding device for billboard processing according to any one of claims 1 to 7, characterized in that: The welding method comprises the following steps: S1: placing the billboard on the operating platform (3); S2: applying negative pressure to the billboard on the operating platform (3) through the negative pressure component (4); S3: adjusting the fixing component (6) to a corresponding angle at which the round tube needs to be welded on the billboard by means of the adjusting component (7); S4: passing the round tube through the fixing assembly (6); S5: The end of the round tube is brought into contact with the welding position of the billboard by moving the operating platform (3). S6: Locking the round tube by means of a fixing assembly (6); S7: The round tube is welded to the billboard by means of a welding assembly (8).

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