An automatic welding device and method for fillet welds

Abstract

The application discloses a kind of automatic welding devices and methods of fillet weld, it is related to automatic welding device field of fillet weld, including direction-changing component, limiting component and welding assembly, the direction-changing component is slidably connected between one side of limiting component, the welding assembly is movably installed in the inside of direction-changing component, the direction-changing component includes first support plate and second support plate, and the side of first support plate is fixedly installed with first link block.The position of two metal structures is determined by first fixed plate and second fixed plate respectively when welding, in the welding process, it is guaranteed that two metal structures are in perpendicular state, the second support plate can be rotated around the center of first link block and second link block, so that it can adapt to metal structures of different thickness, and the first support plate and the second support are perpendicular, so that the welding assembly can always align weld.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic welding device of fillet weld, in particular to an automatic welding device and method of fillet weld. BACKGROUND

[0002] Fillet weld refers to the joint of two metal parts connected together at a 90-degree angle through welding. This welding method is commonly used in the manufacture of angle steel, square tube, round tube and other components, and is also commonly used in the welding of steel structure, bridge, ship and other large projects.

[0003] In the prior art, such as Chinese patent No. CN109352127A "Automatic welding device and method of fillet weld", the sliding block is a hollow structure, the sliding block and the welding gun are fixed on the welding execution mechanism of the vertical fillet welding machine according to the fixed relative position, the welding gun is located in the front part of the welding track line, the sliding block slides along the front surface of the welding opening during welding, the surface of the sliding block close to the welding opening is provided with an inward recess, the upper middle part of the sliding block is fixed with a penetrating blowing pipe, the outlet end of the blowing pipe communicates with the gap between the welding opening and the sliding block, the sliding block is a water-cooled structure, and the back surface of the welding opening is adsorbed with a metal hose of the water-cooled structure. The welding method is: rust removal, drying, oil removal; welding bottom weld; preheating on both sides of the welding opening; welding wire is installed on the wire feeding mechanism of the gas-electric vertical welding machine, and cooling circulating water is introduced; the vertical fillet welding machine welds the welding opening, and the protective gas protects the welding pool.

[0004] However, in the prior art, the specific size of different metal structures is not the same, and the position of the thick metal structure weld is higher than that of the thin metal structure. At this time, the welding device will not be accurately positioned during the approach to the weld due to the different horizontal and vertical movement distances. Different movement distances will cause the angle between the welding head and the weld to change simultaneously, and when the angle and positioning are not accurate, the welding device also needs to move within the range of the weld, which will directly affect the welding quality. SUMMARY

[0005] The purpose of the present application is to provide an automatic welding device and method of fillet weld to solve the problem of not being conducive to maintaining balance and stability as described in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme: an automatic welding device and method of fillet weld, comprising a direction changing assembly, a limiting assembly and a welding assembly, one side of the direction changing assembly is slidably connected with one side of the limiting assembly, and the welding assembly is movably installed in the interior of the direction changing assembly.

[0007] The variable direction assembly comprises a first support plate and a second support plate, one side of the first support plate is fixedly provided with a first connecting block, one side of the second support plate is fixedly provided with a second connecting block, one side of the first connecting block is rotatably connected with one side of the second connecting block, the bottom of the first support plate and the bottom of the second support plate are rotatably provided with universal wheels, one end of the second support plate is fixedly provided with a protrusion, both sides of the protrusion are rotatably provided with abutting rollers.

[0008] One side of the first support plate and one side of the second support plate are fixedly provided with a toothed plate, one side of the second support plate is provided with a speed reducer, the output end of the speed reducer is provided with an abutting gear, the abutting gear is meshingly connected with the toothed plate.

[0009] The limiting assembly comprises a first fixed plate, a movable plate and a second fixed plate, one side of the first fixed plate is fixedly provided with an electric cylinder, one end of the piston rod of the electric cylinder is fixedly connected with one side of the movable plate, one end of the movable plate is movably connected with one end of the second fixed plate.

[0010] The first support plate and the second support plate are located on one side of the second fixed plate, the movable plate is located on one end of the second support plate, the top of the second fixed plate is fixedly provided with an extension plate, the inside of the extension plate is rotatably provided with limiting rotating rods, and the two limiting rotating rods are located on the two sides of the second support plate.

[0011] Preferably, the welding assembly comprises an electric welding gun, one end of the electric welding gun is threadedly connected with a connecting rod, and the electric welding gun is located in the inside of the first support plate and the second support plate.

[0012] Preferably, one end of the connecting rod is threadedly connected with a lead screw, one end of the lead screw is movably connected with a servo motor, the servo motor is movably mounted on the top of the first support plate and the second support plate, and the lead screw is rotatably installed in the inside of the first support plate and the second support plate.

[0013] Preferably, one end of the first support plate and one end of the second support plate are both provided with a rectangular notch, one side of the rectangular notch is provided with a through hole, and the head of the electric welding gun is slidably connected in the inside of the through hole.

[0014] Preferably, one end of the movable plate is fixedly provided with a guide rod, one end of the guide rod is slidably connected in the inside of the second fixed plate, and the second fixed plate is provided with a receiving hole.

[0015] Preferably, a positioning block is fixedly mounted at the intersection of the movable plate and the guide rod, a positioning groove is formed at the intersection of the second fixed plate and the receiving hole, and the shape of the positioning groove is matched with the shape of the positioning block.

[0016] Preferably, a telescopic rod is fixedly connected between the movable plate and the first fixed plate, and the telescopic rod is located on both sides of the electric cylinder.

[0017] Preferably, one side of the movable plate is provided with an extrusion plate, one side of the extrusion plate is fixedly provided with a butt joint rod, and the extrusion plate is slidably connected with the movable plate through the butt joint rod.

[0018] Preferably, a tension spring is fixedly connected to one side of the extrusion plate, the other end of the tension spring is fixedly connected to the outer wall of the movable plate, and the tension spring is sleeved on the outer wall of the butt joint rod.

[0019] A method for automatically welding a fillet weld comprises the following steps:

[0020] S1, two metal structures to be welded are respectively arranged on one side of the second fixed plate and the movable plate, a thicker metal structure is first arranged between the second support plate and the second fixed plate, then the electric cylinder is started to push the movable plate to move along the direction of the telescopic rod, and then another metal structure is arranged on one side of the extrusion plate, at this time, under the elastic force of the tension spring, the metal structure is pushed to one side of the second fixed plate through the extrusion plate, so as to form a ninety-degree angle;

[0021] S2, the reduction motor is started to drive the butt joint gear to rotate, the butt joint gear first drives the second support plate to move through the tooth plate, and when the butt joint roller at the other end of the second support plate contacts the metal structure on the movable plate, the second support plate rotates around the center of the first and second connecting blocks;

[0022] S3, in the process that the second support plate is pushed by the butt joint gear, the tooth plate on the first support plate gradually approaches the butt joint gear, when the second support plate moves away from the butt joint gear, the tooth plate on the first support plate is engaged with the butt joint gear, and then the butt joint gear directly pushes the first support plate to move;

[0023] S4, the first support plate moves in a straight line, and in this process, the second support plate is continuously pushed to move, when the second support plate is parallel to the metal structure, the rectangular gap at the joint of the first support plate and the second support plate is completely unfolded, and the head part of the electric welding gun is aligned with the joint of the two metal structures;

[0024] S5, the connecting end of the electric welding gun is connected with an external power supply, and then normal welding can be carried out, in the process of welding, the position of the electric welding gun is adjusted according to the requirement, the servo motor is driven to rotate to drive the lead screw to move up and down, and the connecting rod is driven to move up and down, so that the position of the electric welding gun is changed, and the joint of the two metal structures is fully welded.

[0025] Compared with the prior art, the method has the advantages that:

[0026] 1、The application, the movement route of the direction changing assembly and the position of the metal structure are limited by the limiting assembly, the position of the two metal structures is determined by the first fixed plate and the second fixed plate respectively, one of the metal structures is limited by the second fixed plate, the second support plate and the first support plate, the other metal structure is limited by the extrusion plate, the two metal structures are kept in the perpendicular state during the welding process, and when the second support plate is behind the metal structure during the process that the direction changing device approaches the welding seam, the second support plate can rotate around the center of the first connecting block and the second connecting block, so that the first support plate and the second support plate can be kept in the perpendicular state, and the welding assembly can always be aligned with the welding seam.

[0027] 2、The application, the direction changing assembly is mainly composed of the first support plate and the second support plate, the two support plates can rotate around the center of the first connecting block and the second connecting block, and the movement of the two support plates is limited by the limiting rotating rod, so that one of the support plates can be kept in the parallel state with the second fixed plate, thereby maintaining the structural stability of the direction changing assembly, and the movement of the first support plate and the second support plate is limited by the limiting rotating rod, so that the first support plate or the second support plate will not deviate from the second fixed plate. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic view of the automatic welding device for the corner weld of the application;

[0029] Figure 2 It is a top view of the automatic welding device for the corner weld of the application;

[0030] Figure 3 It is a three-dimensional structural schematic view of the direction changing assembly, part of the limiting assembly and the welding assembly of the automatic welding device for the corner weld of the application;

[0031] Figure 4 It is a front view of the limiting assembly of the automatic welding device for the corner weld of the application;

[0032] Figure 5 It is a schematic view of the connection structure between the welding assembly and the direction changing assembly of the automatic welding device for the corner weld of the application;

[0033] Figure 6 It is a three-dimensional structural schematic view of the limiting assembly of the automatic welding device for the corner weld of the application;

[0034] Figure 7 It is a schematic view of the movable plate structure of the automatic welding device for the corner weld of the application.

[0035] In the figure: 1, change direction assembly; 2, limiting assembly; 3, welding assembly; 11, first support plate; 12, second support plate; 13, speed reducer motor; 14, butt gear; 15, rectangular notch; 16, toothed plate; 17, first link block; 18, second link block; 19, universal wheel; 110, protruding block; 111, butt roller; 112, through hole; 21, first fixed plate; 22, movable plate; 23, second fixed plate; 24, containing hole; 25, positioning groove; 26, guide rod; 27, extrusion plate; 28, butt rod; 29, tension spring; 210, telescopic rod; 211, electric cylinder; 212, positioning block; 213, extension plate; 214, limiting rotating rod; 31, electric welding gun; 32, link rod; 33, screw rod; 34, servo motor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Embodiment one

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The utility model discloses an automatic welding device and method for fillet welding, which comprises a direction-changing assembly 1, a limiting assembly 2 and a welding assembly 3. The direction-changing assembly 1 is slidably connected between one side of the limiting assembly 2, and the welding assembly 3 is movably installed inside the direction-changing assembly 1. The direction-changing assembly 1 comprises a first support plate 11 and a second support plate 12. The first support plate 11 is fixedly installed with a first connecting block 17 on one side. The second support plate 12 is fixedly installed with a second connecting block 18 on one side. The first connecting block 17 is rotatably connected with the second connecting block 18 on one side. Universal wheels 19 are rotatably installed on the bottom of the first support plate 11 and the second support plate 12. A protruding block 110 is fixedly installed on one end of the second support plate 12. Abutting rollers 111 are rotatably installed on both sides of the protruding block 110. Toothed plates 16 are fixedly installed on one side of the first support plate 11 and the second support plate 12. A reduction motor 13 is arranged on one side of the second support plate 12. An abutting gear 14 is arranged on the output end of the reduction motor 13. The abutting gear 14 is meshingly connected with the toothed plate 16. The limiting assembly 2 comprises a first fixed plate 21, a movable plate 22 and a second fixed plate 23. An electric cylinder 211 is fixedly installed on one side of the first fixed plate 21. The piston rod of the electric cylinder 211 is fixedly connected with one side of the movable plate 22. The movable plate 22 is movably connected with one end of the second fixed plate 23. The first support plate 11 and the second support plate 12 are located on one side of the second fixed plate 23. The movable plate 22 is located on one end of the second support plate 12. An extension plate 213 is fixedly installed on the top of the second fixed plate 23. Limiting rotating rods 214 are rotatably installed inside the extension plate 213. Two limiting rotating rods 214 are respectively located on both sides of the second support plate 12.

[0038] In the embodiment, the limiting assembly 2 limits the position of the direction-changing assembly 1. The welding assembly 3 is built in the direction-changing assembly 1. When in use, two metal structures are respectively arranged on one side of the movable plate 22 and the second fixed plate 23. Then the electric cylinder 211 is started to push the movable plate 22 to splice together with the second fixed plate 23. The metal structure on the second fixed plate 23 is limited by the first support plate 11 and the second support plate 12.

[0039] Then the reduction motor 13 is started to drive the abutting gear 14 to rotate. By using the abutting gear 14 in cooperation with the toothed plate 16, the second support plate 12 is first pushed to move. The second support plate 12 drives the first support plate 11 to move together. When the abutting roller 111 on one end of the second support plate 12 contacts the metal structure on the movable plate 22, the second support plate 12 rotates around the center of the first connecting block 17 and the second connecting block 18 under the block of the metal structure until the second support plate 12 is parallel to the movable plate 22. Then the second support plate 12 stops rotating.

[0040] And in the process of rotating the second support plate 12, the first support plate 11 side of the toothed plate 16 will be engaged with the butt gear 14 together, to provide a stable power source for the movement of the second support plate 12, the universal wheel 19 can adapt to the rotation of the second support plate 12, and in the process of moving the first support plate 11 and the second support plate 12, it will always be clamped between the two limiting rotating rods 214, to ensure that the first support plate 11 is always parallel to the second fixed plate 23, the presence of the extension plate 213 ensures that the metal structure can enter between the limiting assembly 2 and the direction-changing assembly 1. Example two

[0041] According to Figure 3 and Figure 5 , the welding assembly 3 comprises an electric welding gun 31, one end of the electric welding gun 31 is threadedly connected with a connecting rod 32, the electric welding gun 31 is located inside the first support plate 11 and the second support plate 12, one end of the connecting rod 32 is threadedly connected with a lead screw 33, one end of the lead screw 33 is movably connected with a servo motor 34, the servo motor 34 is movably installed on the top of the first support plate 11 and the second support plate 12, and the lead screw 33 is rotatably installed inside the first support plate 11 and the second support plate 12.

[0042] In this embodiment, one end of the electric welding gun 31 is connected with the connecting rod 32, and is located inside the first support plate 11 and the second support plate 12 respectively, when welding, the connecting end of the electric welding gun 31 is connected with the external power supply, when the first support plate 11 and the second support plate 12 are rotated to be perpendicular, the electric welding gun 31 will be aligned with the position of the weld, so as to complete the alignment of the weld and the electric welding gun 31 while adjusting the angle;

[0043] The connecting rod 32 is used to connect the electric welding gun 31 and the lead screw 33, in the process of welding, the lead screw 33 is driven to rotate by the servo motor 34 according to the length of the weld, and when the lead screw 33 rotates, the connecting rod 32 will move in the vertical direction, so that the electric welding gun 31 moves synchronously along the direction of the weld. Example three

[0044] According to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the direction changing assembly 1 comprises a first support plate 11 and a second support plate 12, one side of the first support plate 11 is fixedly provided with a first connecting block 17, one side of the second support plate 12 is fixedly provided with a second connecting block 18, one side of the first connecting block 17 is rotatably connected with one side of the second connecting block 18, the bottom of the first support plate 11 and the bottom of the second support plate 12 are both rotatably provided with universal wheels 19, one end of the second support plate 12 is fixedly provided with a protruding block 110, both sides of the protruding block 110 are rotatably provided with abutting rollers 111, one end of the first support plate 11 and one end of the second support plate 12 are both provided with rectangular notches 15, one side of the rectangular notch 15 is provided with a through hole 112, and the head of the electric welding gun 31 is slidably connected in the through hole 112.

[0045] In the embodiment, the first connecting block 17 on the first support plate 11 is rotatably connected with the second connecting block 18 on the second support plate 12, so as to determine the rotation center of the second support plate 12, and in the process of rotation of the second support plate 12, the universal wheels 19 can support the second support plate 12 and can synchronously adapt to the change of the angle of the second support plate 12;

[0046] The abutting rollers 111 on the protruding block 110 are located between the movable plate 22 and the second support plate 12, and when the second support plate 12 moves, the abutting rollers 111 will first contact the metal structure on the movable plate 22, and under the blockage of the metal structure and the thrust of the first support plate 11, the second support plate 12 will be rotated;

[0047] The rectangular notch 15 is mainly used for exposing the head of the electric welding gun 31, so as to ensure that the electric welding gun 31 can weld the weld, and the existence of the through hole 112 provides sufficient movement space for the electric welding gun 31. Embodiment four

[0048] According to Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, one end of the movable plate 22 is fixedly provided with a guide rod 26, one end of the guide rod 26 is slidably connected in the second fixed plate 23, the second fixed plate 23 is provided with a receiving hole 24, the intersection of the movable plate 22 and the guide rod 26 is fixedly provided with a positioning block 212, the intersection of the second fixed plate 23 and the receiving hole 24 is provided with a positioning groove 25, the shape of the positioning groove 25 is matched with the shape of the positioning block 212, the movable plate 22 and the first fixed plate 21 are fixedly connected with an extension rod 210, the extension rod 210 is located on both sides of the electric cylinder 211, one side of the movable plate 22 is provided with a pressing plate 27, one side of the pressing plate 27 is fixedly provided with a butt joint rod 28, the pressing plate 27 is slidably connected with the movable plate 22 through the butt joint rod 28, one side of the pressing plate 27 is fixedly connected with a tension spring 29, the other end of the tension spring 29 is fixedly connected to the outer wall of the movable plate 22, and the tension spring 29 is sleeved on the outer wall of the butt joint rod 28.

[0049] In the embodiment, the guide rod 26 is used for connecting the movable plate 22 and the second fixed plate 23, the receiving hole 24 is arranged in the second fixed plate 23 to accommodate the guide rod 26, and when the electric cylinder 211 drives the movable plate 22 to move, the guide rod 26 and the extension rod 210 determine the movement route of the movable plate 22, so that the movable plate 22 is prevented from deviating from the second fixed plate 23.

[0050] When one end of the second fixed plate 23 and one end of the movable plate 22 are spliced together, the guide rod 26 enters the receiving hole 24, and the positioning block 212 enters the positioning groove 25, so that the connection stability between the second fixed plate 23 and the movable plate 22 is improved.

[0051] The electric cylinder 211 drives the movable plate 22 to move, so that one end of the metal structure on the side of the second fixed plate 23 is located at one end of the movable plate 22, then the second metal structure is placed on one side of the pressing plate 27, the butt joint rod 28 of the pressing plate 27 can move along the direction of the movable plate 22, and the elastic force of the tension spring 29 enables the pressing plate 27 to push the metal structure to the end of the other metal structure.

[0052] The working principle of the device is as follows: two metal structures to be welded are respectively arranged on one side of the second fixed plate 23 and the movable plate 22, first, a thicker metal structure is arranged between the second support plate 12 and the second fixed plate 23, then the electric cylinder 211 is started to drive the movable plate 22 to move along the direction of the extension rod 210, then the other metal structure is arranged on one side of the pressing plate 27, at this time, under the action of the elastic force of the tension spring 29, the metal structure is pushed to one side of the second fixed plate 23 through the pressing plate 27, so as to form a ninety-degree angle.

[0053] The starting deceleration motor 13 drives the docking gear 14 to rotate, and the docking gear 14 first drives the second support plate 12 to move through the toothed plate 16. When the docking roller 111 at the other end of the second support plate 12 contacts the metal structure on the movable plate 22, the second support plate 12 will rotate around the center of the first and second connecting blocks 17 and 18.

[0054] In the process of driving the second support plate 12, the toothed plate 16 on the first support plate 11 will gradually approach the docking gear 14. When the second support plate 12 moves away from the docking gear 14, the toothed plate 16 on the first support plate 11 will mesh with the docking gear 14, and then the docking gear 14 will directly drive the first support plate 11 to move.

[0055] The first support plate 11 moves in a straight line and synchronously drives the second support plate 12 to continue to move. When the second support plate 12 is parallel to the metal structure, the rectangular notch 15 at the joint of the first and second support plates 11 and 12 will be fully unfolded, and the head of the electric welding gun 31 will be aimed at the joint of the two metal structures.

[0056] Connect the connecting end of the electric welding gun 31 to the external power supply, and then normal welding can be performed. During the welding process, the position of the electric welding gun 31 is adjusted according to the requirements, the lead screw 33 is driven to rotate by the servo motor 34, the connecting rod 32 is driven to move up and down, and the position of the electric welding gun 31 is changed, so that the joint of the two metal structures is fully welded.

[0057] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic welding device for welding a fillet, characterized in that: The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12). The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12). The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12). The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12). The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12).

2. An automatic welding device for welding a fillet according to claim 1, characterized in that: The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12).

3. An automatic welding device for welding a fillet according to claim 2, characterized in that: The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12).

4. The automatic welding device for a fillet weld according to claim 3, characterized in that: The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12). The utility model relates to a welding assembly (3), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12), and the welding assembly (3) is rotatably connected between the first support plate (11) and the second support plate (12).

5. An automatic welding device for welding a fillet according to claim 4, characterized in that: One end of the movable plate (22) is fixedly provided with a guide rod (26), one end of the guide rod (26) is slidably connected in the second fixed plate (23), and the second fixed plate (23) is provided with a containing hole (24).

6. An automatic welding device for a fillet weld according to claim 5, characterized in that: The intersection of the movable plate (22) and the guide rod (26) is fixedly provided with a positioning block (212), the intersection of the second fixed plate (23) and the containing hole (24) is provided with a positioning groove (25), and the shape of the positioning groove (25) is matched with the shape of the positioning block (212).

7. An automatic welding device for welding a fillet according to claim 6, characterized in that: The movable plate (22) and the first fixed plate (21) are fixedly connected with a telescopic rod (210), and the telescopic rod (210) is located on both sides of the electric cylinder (211).

8. An automatic welding device for welding a fillet according to claim 7, characterized in that: One side of the movable plate (22) is provided with a pressing plate (27), one side of the pressing plate (27) is fixedly provided with a butt joint rod (28), and the pressing plate (27) is slidably connected with the movable plate (22) through the butt joint rod (28).

9. An automatic welding device for welding a fillet according to claim 8, characterized in that: One side of the pressing plate (27) is fixedly connected with a tension spring (29), the other end of the tension spring (29) is fixedly connected to the outer wall of the movable plate (22), and the tension spring (29) is sleeved on the outer wall of the butt joint rod (28).

10. A method of automatic welding of a fillet weld, characterized in that, The automatic welding device for the fillet weld is used, and the following steps are included: S1, two metal structures to be welded are respectively arranged on one side of the second fixed plate (23) and the movable plate (22), a thicker metal structure is arranged between the second support plate (12) and the second fixed plate (23), then the electric cylinder (211) is started to drive the movable plate (22) to move along the direction of the telescopic rod (210), then another metal structure is arranged on one side of the pressing plate (27), at this time, under the action of the tension spring (29), the metal structure is pushed to one side of the second fixed plate (23) through the pressing plate (27), so that a ninety-degree angle is formed; S2, the reduction motor (13) is started to drive the butt joint gear (14) to rotate, the butt joint gear (14) first drives the second support plate (12) to move through the toothed plate (16), when the butt joint gear (14) is in contact with the metal structure on the movable plate (22), the second support plate (12) rotates around the center of the first link block (17) and the second link block (18); S3, in the process that the second support plate (12) is pushed by the butt joint gear (14), the toothed plate (16) on the first support plate (11) gradually approaches the butt joint gear (14), when the second support plate (12) moves away from the butt joint gear (14), the toothed plate (16) on the first support plate (11) is engaged with the butt joint gear (14), then the butt joint gear (14) directly drives the first support plate (11) to move. S4, the first support plate (11) moves in a straight line, and in the process, it synchronously pushes the second support plate (12) to continue moving. When the second support plate (12) is parallel to the metal structure, the rectangular gap (15) at the intersection of the first support plate (11) and the second support plate (12) will be fully unfolded, and at this time, the head of the electric welding gun (31) will be aimed at the intersection of the two metal structures; S5, connect the connecting end of the electric welding gun (31) with the external power supply, and then normal welding can be carried out. In the process of welding, the position of the electric welding gun (31) is adjusted according to the needs, the servo motor (34) drives the screw rod (33) to rotate, drives the connecting rod (32) to move up and down, and the position of the electric welding gun (31) is changed, so that the intersection of the two metal structures is fully welded.

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