A sheet metal corner welding fixture

Abstract

The present invention relates to the technical field of sheet metal processing, and discloses a sheet metal corner welding fixture, comprising a base, wherein one end of the top of the base is fixedly connected to a supporting bottom block, a clamping device is connected to a groove inside the supporting bottom block, and the bottom of the clamping device is correspondingly connected to the top of the other end of the base, two sliding columns are fixedly connected to the top of the supporting bottom block, and the outer surfaces of the tops of the two sliding columns are movably connected to long strips, the tops of the long strips are fixedly connected to a motor, the bottoms of the long strips are fixedly connected to a sliding rod, and the outer surfaces of the sliding rods are movably connected to a welding device, the clamping device comprises a movable device and a fixing device, the movable device will drive the fixing device connected to the groove to move, and the movable fixing device will move the sheet metal fixed on the top to the bottom of the welding device, and weld the corners of the sheet metal through the welding device.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal processing, in particular to a sheet metal corner welding fixture. Background Art

[0002] The sheet metal car is a box-shaped space used by elevators to carry and transport people and materials. The car is generally composed of main components such as the car bottom, car wall, car top, and car door. It is a car body component used by elevators to carry passengers or goods and other loads. The formed car is assembled by welding various components. At present, when welding the car, the components are fixed on the fixture and then welded by workers. However, the volume of the components is large, and the workers need to walk around the components. In addition, when welding the bottom of the components, the workers have to drill under the components. This not only increases the work intensity of the workers, but also reduces production efficiency. The traditional welding device fixture does not try to use the clamping of the sheet metal, so a new fixture is needed. In addition to this, during the welding process, the sheet metal must be constantly moved. Compared with the traditional moving method, it is impossible to change the position in time for welding, which easily leads to a decrease in the production quantity of the product. Based on this, the present invention proposes a sheet metal corner welding fixture to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a sheet metal corner welding fixture to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sheet metal corner welding fixture, comprising a base, one end of the top of the base is fixedly connected to a supporting bottom block, a clamping device is connected to the inner groove of the supporting bottom block, and the bottom of the clamping device is correspondingly connected to the top of the other end of the base, two sliding columns are fixedly connected to the top of the supporting bottom block, and the outer surfaces of the tops of the two sliding columns are movably connected to long strips, the tops of the long strips are fixedly connected to a motor, the bottoms of the long strips are fixedly connected to a sliding rod, and the outer surfaces of the sliding rods are movably connected to a welding device, the clamping device comprises a movable device and a fixing device, and when the movable device is moved, it will drive the fixing device connected to the groove to move, and at this time, the fixing device will move the fixed sheet metal to the bottom of the welding device;

[0005] The welding device includes a double-outlet cylinder. When the double-outlet cylinder is extended and retracted by its own power, it will pull the semicircular rods connected at both ends to swing, thereby facilitating the welding heads connected at the bottom ends of the two semicircular rods to weld the corners of the sheet metal parts.

[0006] As a preferred technical solution of the present invention, the movable device includes a pneumatic cylinder, the outer surface of the pneumatic cylinder is connected to the internal groove of the supporting bottom block, the output shaft end of the pneumatic cylinder is fixedly connected to a U-shaped rod, and the top end of the U-shaped rod is movably connected to a first rotating shaft.

[0007] As a preferred technical solution of the present invention, a movable block is movably connected to the inner side of the hollow part of the U-shaped rod, and the second rotating shaft is movably connected to both ends of the movable block, and a rounded rectangle is movably connected to the inner side of the hollow part of the movable block, and the top of the rounded rectangle is connected to the center of the first rotating shaft and the second rotating shaft, and the bottom end of the rounded rectangle is fixedly connected to a movable plate, and the top groove of the movable plate is fixedly connected to a fixing device.

[0008] As a preferred technical solution of the present invention, the fixing device includes a polygonal block, the bottom of the polygonal block is fixedly connected to the groove at the top of the movable plate, the top of the polygonal block is fixedly connected to a telescopic rod, and the top of the telescopic rod is movably connected to a third rotating shaft.

[0009] As a preferred technical solution of the present invention, a long rod is movably connected at both ends of the third rotating shaft, a plurality of conical fixed blocks are fixedly connected to the inner side of the top end of the long rod, first elliptical blocks are movably connected on both sides of the bottom end of the long rod, convex plates are movably connected to the bottom ends of the two first elliptical blocks, and the outer side of the convex plate is fixedly connected to the inner side of the raised part of the polygonal block.

[0010] As a preferred technical solution of the present invention, the welding device includes a sliding block, the groove at the top of the sliding block is movably connected to the outer surface of the sliding rod, the raised parts at both ends of the bottom of the sliding block are movably connected to the first gear and the second gear, and the outer surfaces of the first gear and the second gear are meshed with each other, the bottom of the second gear is movably connected to a rotating round block, and the bottom of the rotating round block is fixedly connected to a double-outlet cylinder.

[0011] As a preferred technical solution of the present invention, both ends of the double-outlet cylinder are movably connected with semicircular rods, the bottom ends of the two semicircular rods are fixedly connected with welding heads, the inner raised parts of the centers of the two semicircular rods are movably connected with second elliptical blocks, and the inner grooves of the two second elliptical blocks are movably connected with long rods.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) A sheet metal corner welding fixture, which can move up and down by using the power generated by a motor by setting the bottom end of a long strip on the outer surface of two sliding columns, so that the welding device can weld the corners of the sheet metal fixed on the top of the clamping device to close and fix the corners. When the clamping device is folded by the movement of the movable device, the fixing device located in the groove of the movable device can quickly fix the two sides of the sheet metal. The fixed corners can reduce errors and repeated work during welding, thereby improving production efficiency and product quality.

[0014] (2) A sheet metal corner welding fixture, which can use the telescopic movement of the pneumatic cylinder to move the U-shaped rod by arranging a U-shaped rod at the output shaft end of the pneumatic cylinder, and the U-shaped rod is located at the grooves on both sides of the movable block. When the first rotating shaft of the movable connection at the front end of the U-shaped rod moves backward under the pull of the rear pneumatic cylinder, it will quickly drive the rounded rectangle to move in a vertical state, so that the fixing device connected to the groove of the movable plate can move its position after fixing the two sides of the sheet metal. At the same time, by raising the sheet metal corner to the welding position and welding, the strength and stability of the sheet metal can be effectively increased, making it more durable during use.

[0015] (3) A sheet metal corner welding fixture, which sets the center of the third rotating axis at the top of the telescopic rod, so that the telescopic rod can use the power generation of the long strip to push the third rotating axis and the long rod movably connected at both ends to move downward. At the same time, several conical fixing blocks connected to the inner side of the top of the long rod will be aligned with the two sides of the sheet metal to firmly fix it. The two sides of the long rod are movably connected to the first elliptical blocks, which can provide a support point when the long rod moves back and forth, thereby reinforcing the surroundings when welding the sheet metal corners, ensuring that the corners will not shift or deform during the welding process, thereby enhancing the stability of the connection.

[0016] (4) A sheet metal corner welding fixture, which can move left and right with the power generation of the motor by setting the groove at the top of the sliding block at the bottom of the sliding rod, so that the welding device can obtain welding at different positions. The first gear and the second gear are meshed and connected with each other, so the rotating round block connected to the bottom of the second gear will drive the double-outlet cylinder to rotate, so that the welding head can continuously change position to weld the sheet metal. The double-outlet cylinder will push the top of the semicircular rod with movable connection at both ends to move to both sides. At this time, the welding head connected to the semicircular rod and the bottom will move toward the center, and the welding in the movable position can provide better penetration, especially for thicker welds.

[0017] (5) A sheet metal corner welding fixture, which is provided with a second elliptical block connected to the raised part of a semicircular rod. When the semicircular rod moves, the long rod connected between the two second elliptical blocks can be straightened. After straightening, the welding of the bottom welding heads of the two semicircular rods can be stabilized. This welding method can ensure a greater penetration depth of the weld, thereby ensuring the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the front and side structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the clamping device in the present invention;

[0021] Figure 4 It is a schematic diagram of the activity device in the present invention;

[0022] Figure 5 It is a schematic diagram of the internal connection relationship of the active block in the present invention;

[0023] Figure 6 It is a schematic diagram of the fixing device in the present invention;

[0024] Figure 7 It is a schematic diagram of the welding device in the present invention;

[0025] Figure 8 It is a schematic diagram of the connection relationship of the semicircular rods in the present invention.

[0026] In the figure: 1. base; 2. supporting bottom block; 3. clamping device; 31. movable device; 311. pneumatic cylinder; 312. U-shaped rod; 313. first rotating axis; 314. movable block; 315. second rotating axis; 316. rounded rectangle; 317. movable plate; 32. fixing device; 321. polygonal block; 322. telescopic rod; 323. third rotating axis; 324. long rod; 325. conical fixing block; 326. first elliptical block; 327. convex plate; 4. sliding column; 5. long plate; 6. motor; 7. sliding rod; 8. welding device; 81. sliding block; 82. first gear; 83. second gear; 84. rotating circular block; 85. double-outlet cylinder; 86. semicircular rod; 87. welding head; 88. second elliptical block; 89. long rod. DETAILED DESCRIPTION

[0027] 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.

[0028] Example: See Figure 1-8A sheet metal corner welding fixture comprises a base 1, a supporting bottom block 2 is arranged at one end of the top of the base 1, and the top end of the base 1 is fixedly connected to the bottom of the supporting bottom block 2, a clamping device 3 is arranged at the inner groove of the supporting bottom block 2, and the inner groove of the supporting bottom block 2 is connected to the bottom end of the clamping device 3, and the bottom of the clamping device 3 is correspondingly connected to the top of the other end of the base 1, two sliding columns 4 are arranged at the top of the supporting bottom block 2, and the top of the supporting bottom block 2 is fixedly connected to the bottom of the two sliding columns 4, and the outer surface of the top of the two sliding columns 4 is arranged with a long strip 5, and the two sliding The top outer surface of the column 4 is movably connected to the bottom end of the long plate 5. By setting the bottom end of the long plate 5 on the outer surface of the two sliding columns 4, it can be moved up and down by using the power generation of the motor 6, so as to facilitate the welding device 8 to weld the corners of the sheet metal fixed on the top of the clamping device 3, so that the corners are closed and fixed. When the clamping device 3 is folded by the movement of the movable device 31, the fixing device 32 located in the groove of the movable device 31 will quickly fix the two sides of the sheet metal. Because the fixed corners can reduce errors and repetitive work during welding, the production efficiency and product quality are improved. A motor 6 is provided at the top of the long plate 5, and the top of the long plate 5 is fixedly connected to the bottom of the motor 6. A sliding rod 7 is provided at the bottom of the long plate 5, and the bottom of the long plate 5 is fixedly connected to the top of the sliding rod 7. A welding device 8 is provided on the outer surface of the sliding rod 7, and the outer surface of the sliding rod 7 is movably connected to the top of the welding device 8. The clamping device 3 includes a movable device 31 and a fixing device 32. When the movable device 31 is moved, the fixing device 32 connected to the groove is also driven to move. At this time, the fixing device 32 will move the fixed sheet metal part to the bottom of the welding device 8;

[0029] The welding device 8 includes a double-outlet cylinder 85. When the double-outlet cylinder 85 is extended and retracted by its own power, it will pull the semicircular rods 86 connected at both ends to swing, thereby facilitating the welding heads 87 connected at the bottom ends of the two semicircular rods 86 to weld the corners of the sheet metal parts.

[0030] The movable device 31 includes a pneumatic cylinder 311, the outer surface of which is connected to the inner groove of the supporting bottom block 2, a U-shaped rod 312 is provided at the output shaft end of the pneumatic cylinder 311, and the output shaft end of the pneumatic cylinder 311 is fixedly connected to the bottom end of the U-shaped rod 312, a first rotating shaft 313 is provided at the top end of the U-shaped rod 312, and the top end of the U-shaped rod 312 is movably connected to both ends of the first rotating shaft 313.

[0031] A movable block 314 is provided inside the hollow part of the U-shaped rod 312, and the inner side of the hollow part of the U-shaped rod 312 is movably connected to the outer groove of the movable block 314, and the second rotating shaft 315 is provided at both ends of the movable block 314, and the two ends of the movable block 314 are movably connected to the two ends of the second rotating shaft 315, and a rounded rectangle 316 is provided inside the hollow part of the movable block 314, and the inner side of the hollow part of the movable block 314 is movably connected to the outer side of the rounded rectangle 316, and the top of the rounded rectangle 316 is connected to the center of the first rotating shaft 313 and the second rotating shaft 315, and a movable plate 317 is provided at the bottom of the rounded rectangle 316, and the bottom of the rounded rectangle 316 is fixedly connected to the bottom of the movable plate 317, through The U-shaped rod 312 is arranged at the output shaft end of the pneumatic cylinder 311, and the U-shaped rod 312 can be moved by the telescopic movement of the pneumatic cylinder 311. The U-shaped rod 312 is located at the grooves on both sides of the movable block 314. When the first rotating shaft 313 movably connected to the front end of the U-shaped rod 312 moves backward with the pull of the pneumatic cylinder 311 behind, the rounded rectangle 316 will be quickly driven to move in a vertical state, so that the fixing device 32 connected to the groove of the movable plate 317 can move its position after fixing both sides of the sheet metal. At the same time, by raising the sheet metal corners to the welding position and welding, the strength and stability of the sheet metal can be effectively increased, so that it has better durability during use. The fixing device 32 is arranged at the groove at the top of the movable plate 317, and the groove at the top of the movable plate 317 is fixedly connected to the bottom of the fixing device 32.

[0032] The fixing device 32 includes a polygonal block 321, the bottom of which is fixedly connected to the groove at the top of the movable plate 317, a telescopic rod 322 is provided at the top of the polygonal block 321, and the top of the polygonal block 321 is fixedly connected to the bottom of the telescopic rod 322, a third rotating shaft 323 is provided at the top of the telescopic rod 322, and the top of the telescopic rod 322 is movably connected to the central outer surface of the third rotating shaft 323.

[0033] The third rotating shaft 323 is provided with a long bar 324 at both ends, and the two ends of the third rotating shaft 323 are movably connected to the bottom end of the long bar 324. A plurality of conical fixing blocks 325 are provided on the inner side of the top end of the long bar 324, and the inner side of the top end of the long bar 324 is fixedly connected to the top end of the plurality of conical fixing blocks 325. The bottom end of the long bar 324 is provided with a first elliptical block 326 on both sides, and the bottom end of the long bar 324 is movably connected to the top end of the first elliptical block 326 on both sides. The bottom ends of the two first elliptical blocks 326 are provided with a convex plate 327, and the bottom ends of the two first elliptical blocks 326 are movably connected to the two sides of the convex plate 327. By setting the center of the third rotating shaft 323 at the top of the telescopic rod 322, the telescopic rod 322 can use the power generation of the long plate 5 to push the third rotating shaft 323 and the long rod 324 movably connected at both ends to move downward. At the same time, the several conical fixing blocks 325 connected to the inner side of the top of the long rod 324 will be aligned with the two sides of the sheet metal for firm fixing. The two sides of the long rod 324 are movably connected to the first elliptical block 326, which can provide a support point when the long rod 324 moves back and forth, thereby reinforcing the surroundings when welding the sheet metal corners, ensuring that the corners will not shift or deform during the welding process, thereby enhancing the stability of the connection. The outer side of the convex plate 327 is fixedly connected to the inner side of the raised part of the polygonal block 321.

[0034] The welding device 8 includes a sliding block 81, the top groove of the sliding block 81 is movably connected to the outer surface of the sliding rod 7, the raised parts at both ends of the bottom of the sliding block 81 are provided with a first gear 82 and a second gear 83, and the raised parts at both ends of the bottom of the sliding block 81 are movably connected to the top centers of the first gear 82 and the second gear 83, and the outer surfaces of the first gear 82 and the second gear 83 are meshed and connected with each other, a rotating round block 84 is provided at the bottom of the second gear 83, and the bottom of the second gear 83 is movably connected to the top of the rotating round block 84, and a double-outlet cylinder 85 is provided at the bottom of the rotating round block 84. By setting the groove at the top of the sliding block 81 At the bottom of the sliding rod 7, it can move left and right with the power generation of the motor 6, so that the welding device 8 can obtain welding at different positions. The first gear 82 and the second gear 83 are meshed and connected with each other, so the rotating round block 84 connected at the bottom of the second gear 83 will rotate with the double-outlet cylinder 85, so that the welding head 87 can continuously change the position to weld the sheet metal. The double-outlet cylinder 85 will push the top of the semicircular rod 86 connected at both ends to move to both sides. At this time, the semicircular rod 86 and the welding head 87 connected to the bottom will move toward the center, and the welding at the active position can provide better penetration, especially for thicker welded parts. The bottom of the rotating round block 84 is fixedly connected to the top of the double-outlet cylinder 85.

[0035] The two ends of the double-outlet cylinder 85 are provided with semicircular rods 86, and the two ends of the double-outlet cylinder 85 are movably connected to the top of the semicircular rod 86, the bottom ends of the two semicircular rods 86 are provided with welding heads 87, and the bottom ends of the two semicircular rods 86 are fixedly connected to the top of the welding head 87, the inner raised parts of the centers of the two semicircular rods 86 are provided with second elliptical blocks 88, and the inner raised parts of the centers of the two semicircular rods 86 are movably connected to the bottom ends of the second elliptical blocks 88, and by arranging the second elliptical blocks 88 to connect the convex parts of the semicircular rods 86, the long rod 89 connected in the middle of the two second elliptical blocks 88 can be straightened when the semicircular rods 86 move, and the welding of the welding heads 87 at the bottom of the two semicircular rods 86 can be stabilized after straightening, and this welding method can ensure that the weld has a greater penetration depth, thereby ensuring the welding quality. The inner grooves of the two second elliptical blocks 88 are provided with long rods 89, and the inner grooves of the two second elliptical blocks 88 are movably connected to the two ends of the long rod 89.

[0036] The working principle of the present invention is as follows:

[0037] First, the motor 6 generates electricity to allow the long strip 5 to slide up and down on the outer surface of the sliding column 4. After being adjusted to a suitable height, the clamping device 3 will slowly fold upward, and the sheet metal corners fixedly connected in the middle of the fixing device 32 will be welded by the welding device 8 at different positions. The clamping device 3 includes a movable device 31 and a fixing device 32. The movable device 31 includes a pneumatic cylinder 311. When the pneumatic cylinder 311 is pulled backward by its own power, it will move with the U-shaped rod 312 fixedly connected to the output shaft end. The inner side of the U-shaped rod 312 just surrounds the grooves on both sides of the movable block 314. Therefore, under the pull of the first rotating shaft 313 connected to the top of the U-shaped rod 312, the rounded corners at the top of the rounded rectangle 316 will slide upward, so that the several fixing devices 32 fixedly connected to the grooves of the movable plate 317 can fix the sheet metal corners during the lifting process. At the same time, when sheet metal parts undergo subsequent treatments such as painting, electroplating, galvanizing, and plastic spraying, raising and welding the corners can make the surface of the sheet metal parts smooth and seamless, thereby improving the effect of subsequent treatments, which helps to improve the appearance quality and overall performance of the sheet metal parts.

[0038] The fixing device 32 includes a telescopic rod 322. When the telescopic rod 322 moves upward through the power generation of the motor 6, it will promote the movement of the third rotating shaft 323 corresponding to the top. The two ends of the third rotating shaft 323 are movably connected to the bottom of the long rod 324. Therefore, when the telescopic rod 322 moves upward, the bottom end of the long rod 324 will fold downward under the rotation of the third rotating shaft 323, so that several conical fixing blocks 325 can firmly fix the two sides of the sheet metal, ensure the integrity of the welding, and prevent the penetration of gas, liquid or solid.

[0039] The welding device 8 includes a sliding block 81, and the groove at the top of the sliding block 81 is movably connected to the outer surface of the sliding rod 7. When the sliding block 81 moves left and right by electricity, it will drive the device connected at the bottom to move together, so that the welding head 87 moves to weld the corner of the sheet metal. The outer surfaces of the first gear 82 and the second gear 83 are meshed and connected with each other, and the rotating first gear 82 and the second gear 83 can not only quickly allow the bottom welding head 87 to rotate in the direction of welding, but also prevent the phenomenon of jamming from occurring during long-term use. When the double-outlet cylinder 85 extends to both sides, it will drive the top of the semicircular rod 86 connected to the output shaft end to expand to both sides. At this time, the welding head 87 at the bottom of the semicircular rod 86 moves toward the center, and the long rod 89 located at the protruding part of the two semicircular rods 86 will be straightened under the movement of the semicircular rods 86. After being straightened, the welding of the two welding heads 87 can be stabilized, thereby reducing the occurrence of welding defects such as pores and slag inclusions, better controlling the flow of the molten pool and the coverage of the protective gas, and reducing the mixing of slag and molten metal.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheet metal corner welding fixture, comprising a base (1), wherein one end of the top of the base (1) is fixedly connected to a supporting bottom block (2), a clamping device (3) is connected to an internal groove of the supporting bottom block (2), and the bottom of the clamping device (3) is correspondingly connected to the top of the other end of the base (1), two sliding columns (4) are fixedly connected to the top of the supporting bottom block (2), and the top outer surfaces of the two sliding columns (4) are movably connected to a long strip (5), the top of the long strip (5) is fixedly connected to a motor (6), the bottom of the long strip (5) is fixedly connected to a sliding rod (7), and the outer surface of the sliding rod (7) is movably connected to a welding device (8), characterized in that: The clamping device (3) comprises a movable device (31) and a fixing device (32). When the movable device (31) moves, it drives the fixing device (32) connected to the groove to move. At this time, the fixing device (32) moves the fixed sheet metal part to the bottom of the welding device (8); The welding device (8) comprises a double-outlet cylinder (85). When the double-outlet cylinder (85) is extended and retracted by its own power, it pulls the semicircular rods (86) connected at both ends to swing, thereby facilitating the welding heads (87) connected at the bottom ends of the two semicircular rods (86) to weld the corners of the sheet metal parts.

2. A sheet metal corner welding fixture according to claim 1, characterized in that: The movable device (31) comprises a pneumatic cylinder (311), the outer surface of the pneumatic cylinder (311) is connected to the inner groove of the supporting bottom block (2), the output shaft end of the pneumatic cylinder (311) is fixedly connected to a U-shaped rod (312), and the top end of the U-shaped rod (312) is movably connected to a first rotating shaft (313).

3. A sheet metal corner welding fixture according to claim 2, characterized in that: A movable block (314) is movably connected to the inner side of the hollow part of the U-shaped rod (312), and the two ends of the movable block (314) are movably connected to the second rotating shaft (315). A rounded rectangle (316) is movably connected to the inner side of the hollow part of the movable block (314), and the top of the rounded rectangle (316) is connected to the center of the first rotating shaft (313) and the second rotating shaft (315). A movable plate (317) is fixedly connected to the bottom end of the rounded rectangle (316), and a fixing device (32) is fixedly connected to the groove at the top of the movable plate (317).

4. A sheet metal corner welding fixture according to claim 3, characterized in that: The fixing device (32) comprises a polygonal block (321), the bottom of the polygonal block (321) is fixedly connected to the groove at the top of the movable plate (317), the top of the polygonal block (321) is fixedly connected to a telescopic rod (322), and the top of the telescopic rod (322) is movably connected to a third rotating shaft (323).

5. A sheet metal corner welding fixture according to claim 4, characterized in that: The two ends of the third rotating shaft (323) are movably connected to a long rod (324), the inner side of the top end of the long rod (324) is fixedly connected to a plurality of conical fixed blocks (325), the two sides of the bottom end of the long rod (324) are movably connected to first elliptical blocks (326), the bottom ends of the two first elliptical blocks (326) are movably connected to convex plates (327), and the outer side of the convex plate (327) is fixedly connected to the inner side of the convex part of the polygonal block (321).

6. The sheet metal corner welding fixture according to claim 1, characterized in that: The welding device (8) comprises a sliding block (81), wherein a groove at the top of the sliding block (81) is movably connected to the outer surface of the sliding rod (7), and the protruding parts at both ends of the bottom of the sliding block (81) are movably connected to a first gear (82) and a second gear (83), and the outer surfaces of the first gear (82) and the second gear (83) are meshed with each other, and the bottom of the second gear (83) is movably connected to a rotating round block (84), and the bottom of the rotating round block (84) is fixedly connected to a double-outlet cylinder (85).

7. A sheet metal corner welding fixture according to claim 6, characterized in that: Both ends of the double-outlet cylinder (85) are movably connected to semicircular rods (86), the bottom ends of the two semicircular rods (86) are fixedly connected to welding heads (87), the central inner convex parts of the two semicircular rods (86) are movably connected to second elliptical blocks (88), and the inner grooves of the two second elliptical blocks (88) are movably connected to long rods (89).

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