Steel structure door leaf panel plug welding automatic welding machine and welding method

Abstract

The invention relates to a steel structure door leaf panel plug welding automatic welding machine and a welding method. The welding machine comprises a working platform, and a sliding support is installed on the working platform in a sliding mode in the longitudinal direction; the multiple welding machines are slidably installed on the sliding support in the transverse direction. Each welding machine comprises a movable arm, a welding gun and a rotating mechanism, the rotating mechanism drives the welding gun to move, so that the welding gun has a circular moving track; the transverse driving mechanism drives the welding machine to slide in the transverse direction, so that the multiple welding guns correspond to the multiple plug welding holes in the first direction of the door leaf; the movement track of the welding gun takes the center of the plug welding hole corresponding to the welding gun as a circle center, and the radius of the movement track is preset according to the diameter of the plug welding hole; the longitudinal driving mechanism drives the sliding support to slide intermittently in the longitudinal direction, so that the welding guns of the multiple welding machines correspond to the multiple plug welding holes in the second direction of the door leaf in sequence. According to the welding method, welding seams can be more uniform and full, welding is firmer, it is ensured that the welding seams are full, the strength reaches the standard, and the quality defect caused by fixed straight welding is effectively avoided.

Description

Technical Field

[0001] This application relates to the technical field of welding equipment, and in particular, to an automatic welding machine and welding method for plug welding of steel structure door leaf panels. Background Art

[0002] As an indispensable key component in civil air defense projects, the main function of civil air defense door leaves is to effectively block the intrusion of harmful substances such as shock waves, poisonous gases, and radioactive substances in case of emergencies such as wars and natural disasters, providing a safe and reliable protection barrier for the personnel in the civil air defense space. Civil air defense door leaves are usually made of steel structure materials, and the welding quality between their panels and skeletons directly affects the overall strength, sealing performance, and service life of the door body. Civil air defense door leaves need to have high strength and stability. By welding inside the holes, the panel and the skeleton are firmly combined. The process requires the welds to be full and uniform to ensure the pressure-bearing performance and impact resistance of the door leaf, so as to meet the strict requirements of civil air defense projects for various extreme working conditions.

[0003] Currently, in the installation process of civil air defense door leaf panels and skeletons, the industry has begun to use automated welding equipment to improve production efficiency. These automated equipment can, to a certain extent, realize the welding operation of the plug welding holes by the welding torch along a predetermined trajectory, reducing problems such as high labor intensity and unstable welding quality caused by traditional manual welding.

[0004] However, the existing automatic welding method uses a fixed straight welding method. Due to the limitation of the movement trajectory of the welding torch, it is difficult to fully adapt to the shape and size of the plug welding holes during the welding process, making it difficult to ensure the uniformity and fullness of the welds inside the plug welding holes, and easily resulting in insufficient welding strength, so that the welding quality is difficult to reach an ideal state. Specifically, the welds are not full enough, the welding is not firm, and phenomena such as false welding and missed welding are likely to occur. This not only affects the overall strength and sealing performance of civil air defense door leaves, reduces their protection efficiency, but also may pose safety hazards during subsequent use. At the same time, traditional plug welding is manual welding, with high labor intensity, many quality defects, and low welding efficiency. Summary of the Invention

[0005] In order to solve the above problems, this application provides an automatic welding machine and welding method for plug welding of steel structure door leaf panels.

[0006] The automatic welding machine and welding method for plug welding of steel structure door leaf panels provided in this application adopt the following technical solutions: In a first aspect, an automatic welding machine for plug welding of steel structure door leaf panels includes: A working platform configured with an installation station for positioning the door leaf; A sliding bracket extending horizontally and slidably mounted on the working platform longitudinally; Multiple welding machines are slidably mounted on the sliding bracket in the transverse direction. The welding machine includes a movable arm, and a welding torch and a rotating mechanism both mounted on the movable arm. The rotating mechanism drives the welding torch to move, so that the welding torch has a circular movement track. A transverse driving mechanism drives the welding machine to slide in the transverse direction, so that a plurality of the welding torches correspond to a plurality of plug welding holes on the door leaf in the first direction. The movement track of the welding torch has the center of the plug welding hole corresponding to the welding torch as the center of the circle, and the radius of the movement track is preset by the diameter of the plug welding hole. And A longitudinal driving mechanism drives the sliding bracket to slide intermittently in the longitudinal direction, so that the welding torches of a plurality of the welding machines correspond to a plurality of plug welding holes on the door leaf in the second direction in sequence.

[0007] Optionally, the rotating mechanism includes: A rotating motor mounted on the movable arm; A driving gear fixed to the output shaft of the rotating motor; and A driven gear rotatably mounted on the movable arm about an axis and meshing with the driving gear. The welding torch is fixed at an eccentric position of the driven gear, and the eccentric distance is half of the radius of the movement track.

[0008] Optionally, the eccentric distance is 4.5 - 5.5 mm.

[0009] Optionally, the longitudinal driving mechanism includes: A rotating shaft extending in the transverse direction. Both ends of the rotating shaft are rotatably connected with a moving seat, and the moving seat is slidably mounted on the working platform in the longitudinal direction; A first motor disposed on the sliding bracket, and the output shaft of the first motor is fixedly connected with the rotating shaft; A first gear fixedly connected to the rotating shaft; and A first rack extending in the longitudinal direction and meshing with the first gear, disposed on the working platform. The first motor drives the first gear to rotate, thereby driving the sliding bracket to move longitudinally.

[0010] Optionally, a lower frame is provided on the working platform, a longitudinal guide rail is provided on the lower frame, the sliding bracket is slidably mounted on the longitudinal guide rail, and the first rack is disposed on the lower frame.

[0011] Optionally, the transverse driving mechanism includes: A second motor disposed on the welding machine; A second gear fixed to the output shaft of the second motor; and A second rack, extending transversely and meshing with the second gear, is provided on the sliding bracket. The second motor drives the second gear to rotate, thereby driving the welding machine to move transversely.

[0012] Optionally, a transverse guide rail is provided on the sliding bracket, and the welding machine is slidably mounted on the transverse guide rail.

[0013] Optionally, the welding torch is a carbon dioxide gas shielded welding torch.

[0014] Optionally, positioning blocks are provided around the installation station on the working platform, and the positioning blocks are used to abut against the periphery of the door leaf.

[0015] In a second aspect, a method for automatic plug welding of a steel structure door leaf panel is based on the above-mentioned automatic plug welding machine for a steel structure door leaf panel, and includes the following steps: Install the door leaf on the working platform; Transverse movement: Start the transverse drive mechanism to drive the welding machine to slide transversely, so that the welding torches of multiple welding machines correspond to multiple plug welding holes in the first direction of the door leaf; Welding: When the welding torch corresponds to the plug welding hole, start the welding torch and the rotating mechanism. The rotating mechanism drives the welding torch to move, so that the welding torch has a circular movement trajectory with the center of the plug welding hole as the center of the circle, so that the welding torch rotates and welds while rotating; Longitudinal movement: Start the longitudinal drive mechanism to drive the sliding bracket to slide intermittently longitudinally, so that the welding torches of multiple welding machines sequentially correspond to multiple plug welding holes in the second direction of the door leaf, and repeat the welding step.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, by arranging multiple welding machines to be slidably mounted on the sliding bracket and the rotating mechanism drives the welding torch to move, the welding torch can rotate and weld with the center of the plug welding hole as the center of the circle and the radius of the preset movement trajectory of the diameter of the plug welding hole during welding, so that the molten pool uniformly covers the inner wall of the plug welding hole, avoiding the problems of local lack of fusion or insufficient penetration in the fixed straight welding due to the stationary or linear movement of the welding torch. The rotating dynamic welding method helps the weld metal to better fuse with the base material, forming a more continuous and dense weld, reducing defects such as pores and inclusions in the weld, making the weld more uniform and full, the welding more firm, ensuring that the weld is full and the strength meets the standard, and effectively avoiding the quality defects caused by fixed straight welding.

[0017] 2. When the welding torch rotates around the center of the plug weld hole, the heat distribution is more uniform, avoiding the problems of overheating or thermal stress concentration of the metal caused by local continuous heating in fixed straight welding. Thus, the warping deformation and internal residual stress of the door leaf panel are reduced, improving the dimensional stability and durability of the product. The welding heat source is evenly distributed around the plug weld hole, and the heat-affected zone is relatively dispersed and has a smaller range, reducing the adverse effects on the performance of the base material, helping to control welding deformation, and improving the overall performance of the welded joint.

[0018] 3. The dynamic molten pool control of rotary welding can suppress metal spatter. Compared with the static molten pool of fixed straight welding, it is more stable, reducing the probability of spatter adhering to the workpiece surface or equipment, lowering the cleaning and maintenance frequency, and improving the safety of the working environment at the same time.

[0019] 4. Through the precise control of the movable arm of the welding machine, even if there are certain assembly errors, the welding torch can accurately find the plug weld hole and perform welding. It has a certain compensation ability for assembly errors, ensuring that the welding quality is not affected and improving the flexibility and adaptability of production.

[0020] 5. Through the transverse drive mechanism (adjusting the transverse spacing of the welding torch) and the longitudinal drive mechanism (intermittently moving the sliding bracket), precise positioning and synchronous welding of multiple welding torches for multiple rows of plug weld holes on the door leaf are achieved, solving the pain points of poor synchronism and large position deviation of multiple welding torches in fixed straight welding equipment and greatly improving the welding efficiency.

[0021] 6. Multiple welding torches perform rotary welding simultaneously, combined with longitudinal intermittent sliding, and can complete the welding task of multiple rows of plug weld holes at one time. Compared with the sequential welding of traditional single welding torches or the intermittent operation of fixed straight welding, the overall efficiency is significantly improved. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the door leaf in the background art; Figure 2 is a schematic structural diagram of the door leaf and the positioning block in the background art; Figure 3 is a schematic structural diagram of the automatic plug welding machine for the steel structure door leaf panel in the embodiment of the present application corresponding to the first row of plug weld holes; Figure 4 is a schematic structural diagram of the automatic plug welding machine for the steel structure door leaf panel in the embodiment of the present application corresponding to the last row of plug weld holes; Figure 5 is Figure 4 a partial enlarged schematic diagram; Figure 6 is a schematic structural diagram of the automatic plug welding machine for the steel structure door leaf panel in another perspective in the embodiment of the present application; Figure 7 is Figure 6 a partial enlarged schematic diagram.

[0023] Description of reference numerals: 100, steel structure door leaf; 110, frame; 120, panel; 121, plug weld hole; 200, automatic plug welding machine for steel structure door leaf panel; 1, working platform; 11, positioning block; 12, lower frame; 13, longitudinal guide rail; 2, sliding support; 21, large carriage; 22, gantry support; 23, transverse guide rail; 3, welding machine; 31, movable arm; 32, welding torch; 33, rotating mechanism; 331, rotating motor; 332, driving gear; 333, driven gear; 4, transverse driving mechanism; 41, second motor; 42, second gear; 43, second rack; 5, longitudinal driving mechanism; 51, rotating shaft; 52, moving seat; 53, first motor; 54, first gear; 55, first rack; 6, control panel. Detailed implementation manners

[0024] The following will combine the attached Figures 1-7 , and clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a 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 efforts belong to the scope of protection of the present application.

[0025] The embodiment of the present application discloses an automatic plug welding machine for steel structure door leaf panel, which is used to weld the door leaf panel 120 and the frame 110. Refer to Figure 1 , the steel structure door leaf 100 includes a frame 110 and panels 120 located on the upper and lower sides of the frame 110. A plurality of plug weld holes 121 are formed in the panel 120, and solder is filled in the plug weld holes 121. The solder is a strip-shaped object, and its melting point is slightly lower than that of the base materials (panel 120 and frame 110), so that it can be fully melted and well combined with the base materials during the welding process. The heat generated by welding makes the local areas of the solder and the base materials reach the melting state. With the transfer and diffusion of heat, the melted solder and the base metal are mixed with each other to form a uniform molten pool in the plug weld hole 121. When the molten pool gradually cools down, the solder and the panel 120, the frame 110 achieve a firm metallurgical bond, thereby tightly connecting the panel 120 and the frame 110 together, and making the steel structure door leaf 100 form a whole. Refer to Figure 2 , a plurality of plug weld holes 121 are arranged in an array along the transverse and longitudinal directions on the panel 120.

[0026] Refer to Figure 3, the automatic plug welding machine for the steel structure door leaf panel includes a working platform 1, a sliding bracket 2, multiple welding machines 3, a transverse driving mechanism 4 and a longitudinal driving mechanism 5.

[0027] The working platform 1 is configured with an installation station for positioning the door leaf. Specifically, positioning blocks 11 are provided around the installation station on the working platform 1 (in combination with Figure 2 and Figure 3 ). The cross-section of the positioning block 11 is L-shaped. Through holes are opened at the bottom of the positioning block 11 for bolts to pass through and be threadedly connected to the working platform 1. The side of the positioning block 11 is used to abut against the periphery of the door leaf, enabling quick positioning and fixing of the door leaf.

[0028] Specifically, in combination with Figure 3 and Figure 4 , the sliding bracket 2 includes a large slide plate 21 and a gantry bracket 22 that both extend horizontally.

[0029] Lower frames 12 are provided on both sides of the installation station on the working platform 1. Multiple longitudinal guide rails 13 are provided on the lower frames 12. The large slide plate 21 is slidably installed longitudinally on the longitudinal guide rails 13. The gantry bracket 22 is fixed to the large slide plate 21 and serves as the installation base for multiple welding machines 3, enabling the welding machines 3 to move along with the movement of the large slide plate 21. Refer to Figure 3 and Figure 4 , the welding machine 3 moves from corresponding to the first row of plug weld holes to corresponding to the last row of plug weld holes, improving the stability and straightness during the longitudinal sliding process of the large slide plate 21 and avoiding shaking or deviation of the sliding bracket 2 during movement.

[0030] The longitudinal driving mechanism 5 drives the large slide plate 21 and the gantry bracket 22 to slide intermittently longitudinally, enabling the welding torches 32 of multiple welding machines 3 to correspond to multiple plug weld holes 121 on the door leaf in the second direction in sequence.

[0031] The longitudinal driving mechanism 5 includes a rotating shaft 51, a moving seat 52, a first motor 53, a first gear 54 and a first rack 55. Refer to Figure 6 , the rotating shaft 51 extends horizontally. Moving seats 52 are rotatably connected to both ends of the rotating shaft 51. The moving seats 52 are slidably installed longitudinally on the lower frames 12.

[0032] Refer to Figure 5, the first motor 53 is arranged on the carriage 21, and the output shaft of the first motor 53 is fixedly connected to the rotating shaft 51; the first gear 54 is fixedly connected to the rotating shaft 51, and the first rack 55 extends longitudinally and meshes with the first gear 54, and is arranged on the lower frame 12. The first motor 53 drives the rotating shaft 51 to rotate, and then through the meshing of the first gear 54 and the first rack 55, the rotational motion is converted into the linear motion of the carriage 21, ensuring the smoothness and accuracy of the carriage 21 during longitudinal movement, and providing a reliable guarantee for the longitudinal positioning of the welding torch 32. The transmission mode of the gear and the rack has high transmission precision and rigidity, which can effectively reduce the clearance and error during transmission, improve the positioning precision of the longitudinal movement of the carriage 21, so as to ensure the accurate correspondence between the welding torch 32 and the plug weld hole 121 longitudinally, improve the welding quality, and at the same time enhance the durability and reliability of the equipment.

[0033] A plurality of welding machines 3 are slidably mounted on the gantry bracket 22 in the transverse direction, and the transverse driving mechanism 4 drives the welding machines 3 to slide transversely, so that a plurality of welding torches 32 correspond to a plurality of plug weld holes 121 on the door leaf in the first direction.

[0034] See Figure 5 , a plurality of transverse guide rails 23 are arranged on the gantry bracket 22, and the welding machines 3 are slidably mounted on the transverse guide rails 23, improving the precision and load-bearing capacity of the welding machines 3 during transverse sliding. The transverse guide rails 23 provide stable sliding support for the welding machines 3, ensuring that the welding machines 3 will not shake or tilt during transverse movement, ensuring the accurate and stable movement track of the welding torches 32, improving the welding quality, and at the same time being able to bear various loads of the welding machines 3 during operation, and extending the service life of the equipment.

[0035] The transverse driving mechanism 4 includes a second motor 41, a second gear 42 and a second rack 43.

[0036] Refer to Figure 6 , the second motor 41 is arranged on the welding machine 3, and the second gear 42 is fixed to the output shaft of the second motor 41; the second rack 43 extends transversely and meshes with the second gear 42, and is arranged on the gantry bracket 22. The second motor 41 drives the second gear 42 to rotate, and then through the meshing of the second gear 42 and the second rack 43, the rotational motion is converted into the linear motion of the welding machine 3, ensuring the smoothness and accuracy of the welding machine 3 during transverse movement, so that the welding torch 32 can quickly and accurately align with each plug weld hole 121 on the door leaf in the first direction.

[0037] Refer to Figure 5, the welding machine 3 includes a movable arm 31, a welding torch 32 and a rotating mechanism 33 that are all installed on the movable arm 31; the rotating mechanism 33 drives the welding torch 32 to move, so that the welding torch 32 has a circular movement trajectory. The movement trajectory of the welding torch 32 is centered on the center of the plug weld hole 121 corresponding to the welding torch 32, and the radius of the preset movement trajectory is the diameter of the plug weld hole 121.

[0038] The rotating mechanism 33 includes a rotating motor 331, a driving gear 332 and a driven gear 333. The rotating motor 331 is installed on the movable arm 31, the driving gear 332 is fixed to the output shaft of the rotating motor 331, the driven gear 333 is rotatably installed on the movable arm 31 around the axis, and meshes with the driving gear 332; the welding torch 32 is fixed at an eccentric position of the driven gear 333, and the eccentricity (the distance between the center line of the welding torch 32 and the center line of the driven gear 333) is half of the radius of the movement trajectory. The eccentricity is 4.5 - 5.5 mm. In this embodiment, there are 6 welding machines 3, the distance between the center line of the welding torch 32 and the center line of the gear is 5 mm, and the center of the welding torch 32 rotates along a circular track with a diameter of 10 mm, which can ensure that the swing amplitude of the welding torch 32 during welding is moderate, which can not only ensure the fullness and quality of the weld, but also will not cause problems such as over - welding or irregular weld shape due to excessive swing amplitude, further improving the reliability and consistency of welding.

[0039] The welding torch 32 is a carbon dioxide gas shielded welding torch. Carbon dioxide gas shielded welding can effectively prevent the oxidation and pollution of the weld metal, improve the mechanical properties and corrosion resistance of the weld. At the same time, its welding speed is fast and the penetration depth is large, which can complete high - quality welding tasks in a short time, further improving the production efficiency and welding quality of the entire welding equipment. The welding machine also includes a control panel 6, and the control panel 6 is connected to each motor for controlling the operation of each motor.

[0040] The embodiment of the present application discloses an automatic plug welding method for the steel structure door leaf panel. Based on the above - mentioned automatic plug welding machine for the steel structure door leaf panel, it includes the following steps: Install the door leaf on the working platform 1; Lateral movement: Start the lateral driving mechanism 4 to drive the welding machine 3 to slide laterally, so that the welding torches 32 of multiple welding machines 3 correspond to multiple plug weld holes 121 in the first direction of the door leaf; Welding: When the welding torch 32 corresponds to the plug weld hole 121, start the welding torch 32 and the rotating mechanism 33. The rotating mechanism 33 drives the welding torch 32 to move, so that the welding torch 32 has a circular movement trajectory centered on the center of the plug weld hole 121, so that the welding torch 32 rotates and welds while moving; Longitudinal movement: Start the longitudinal driving mechanism 5 to drive the sliding bracket 2 to slide intermittently longitudinally, so that the welding torches 32 of multiple welding machines 3 correspond to multiple plug weld holes 121 in the second direction of the door leaf in sequence, and repeat the welding step.

[0041] In this application, multiple welding machines 3 are slidably mounted on a sliding bracket 2 in the transverse direction. The welding machine 3 includes a movable arm 31, a welding torch 32 and a rotating mechanism 33 both mounted on the movable arm 31. The rotating mechanism 33 drives the welding torch 32 to move, so that the welding torch 32 can perform welding with the center of the plug weld hole 121 as the center and the radius of a preset movement trajectory equal to the diameter of the plug weld hole 121 during welding, thereby ensuring the fullness of the weld seam and the firmness of welding, and effectively improving the welding quality.

[0042] In the fixed straight welding method, the welding torch 32 remains stationary and only welds the plug weld hole 121 along a straight line. This welding method is difficult to ensure the fullness and uniformity of the weld seam, and quality problems such as false welding and missed welding are likely to occur, resulting in an insecure and unreliable welded connection, which affects the overall strength and sealing performance of the door leaf. In this application, the welding torch 32 rotates around the center of the plug weld hole 121 under the drive of the rotating mechanism 33 and welds along a preset radius (matched with the hole diameter), so that the molten pool evenly covers the inner wall of the plug weld hole 121, avoiding problems such as local non-fusion or insufficient penetration depth of the weld seam caused by the stationary or linear movement of the welding torch 32 in fixed straight welding. The rotating dynamic welding method helps the weld metal to better fuse with the base material, form a more continuous and dense weld seam, reduce defects such as pores and inclusions in the weld seam, enable the weld seam to be more uniform and full, the welding to be more firm, ensure that the weld seam is full and the strength meets the standard, and effectively avoid the quality defects caused by fixed straight welding.

[0043] When the welding torch 32 rotates around the center of the plug weld hole 121, the heat distribution is more uniform, avoiding problems such as overheating of the metal or thermal stress concentration caused by local continuous heating in fixed straight welding, thereby reducing the warping deformation and internal residual stress of the door leaf panel 120, and improving the dimensional stability and durability of the product. The welding heat source is evenly distributed around the plug weld hole 121, the heat affected zone is relatively dispersed and the range is smaller, reducing the adverse impact on the performance of the base material, helping to control the welding deformation, and improving the overall performance of the welded joint.

[0044] The penetration depth and width of fixed straight welding only depend on the control of current and welding speed, and defects such as excessive penetration in the center and insufficient fusion at the edge are likely to occur, resulting in uneven mechanical properties of the weld seam. During rotary welding, the tip of the welding torch 32 moves along a circular trajectory, and the molten pool diffuses outward under the action of centrifugal force. At the same time, the arc heat is distributed in a gradient along the inner wall of the hole, and finally a gradient weld seam structure with a large penetration depth at the inner wall and a uniform width at the outer edge is formed, significantly improving the shear resistance and fatigue resistance of the plug weld joint.

[0045] The dynamic molten pool control of rotary welding can suppress metal spatter, which is more stable than the static molten pool of fixed straight welding, reducing the probability of spatter adhering to the surface of the workpiece or equipment, reducing the frequency of cleaning and maintenance, and at the same time improving the safety of the working environment.

[0046] In actual production, there may be certain errors in the assembly of the door leaf panel 120 and the frame 110, resulting in a deviation between the position of the plug welding hole 121 and the designed position. The steel structure door leaf panel plug welding automatic welding machine of this solution, through the precise control of the movable arm 31 of the welding machine 3, can accurately find the plug welding hole 121 and perform welding even if there is a certain assembly error, and has a certain compensation ability for the assembly error, ensuring that the welding quality is not affected, and improving the flexibility and adaptability of production.

[0047] The transverse driving mechanism 4 can drive the welding machine 3 to slide transversely, so that the multiple welding guns 32 correspond to the multiple plug welding holes 121 in the first direction of the door leaf, and the longitudinal driving mechanism 5 drives the sliding bracket 2 to slide intermittently in the longitudinal direction, so that the welding guns 32 of the multiple welding machines 3 correspond to the multiple plug welding holes 121 in the second direction of the door leaf in sequence. Through the transverse driving mechanism 4 (adjusting the transverse spacing of the welding guns 32) and the longitudinal driving mechanism 5 (intermittently moving the sliding bracket 2), the multiple welding guns 32 can accurately position and synchronously weld the multiple rows of plug welding holes 121 on the door leaf, solving the pain points of poor synchronization and large position deviation of the multiple welding guns 32 in the fixed direct welding equipment, and greatly improving the welding efficiency. The multiple welding guns 32 perform rotation welding at the same time, and cooperate with the longitudinal intermittent sliding, so as to complete the welding task of multiple rows of plug welding holes 121 at one time, which is significantly improved in overall efficiency compared with the traditional single welding gun 32 sequential welding or fixed direct welding intermittent operation.

[0048] The circular movable trajectory and lateral and longitudinal adjustability of the welding gun 32 enable it to better adapt to door panels 120 of different sizes and shapes and layouts of plug welding holes 121 of different spacings, thereby enhancing the flexibility and adaptability of the welding equipment and meeting welding requirements under various working conditions.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0051] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic welding machine for plug welding of a steel structure door leaf panel, characterized in that, Comprising: A working platform (1) configured with an installation station for positioning the door leaf; A sliding bracket (2) extending transversely and slidably mounted longitudinally on the working platform (1); A plurality of welding machines (3) slidably mounted transversely on the sliding bracket (2), the welding machine (3) including a movable arm (31) and a welding torch (32) and a rotating mechanism (33) both mounted on the movable arm (31); the rotating mechanism (33) drives the welding torch (32) to move, so that the welding torch (32) has a circular movement trajectory; A transverse driving mechanism (4) driving the welding machine (3) to slide transversely, so that a plurality of the welding torches (32) correspond to a plurality of plug welding holes (121) in the first direction of the door leaf; the movement trajectory of the welding torch (32) takes the center of the plug welding hole (121) corresponding to the welding torch (32) as the center of the circle, and presets the radius of the movement trajectory with the diameter of the plug welding hole (121); and A longitudinal driving mechanism (5) driving the sliding bracket (2) to slide intermittently longitudinally, so that the welding torches (32) of a plurality of the welding machines (3) correspond to a plurality of plug welding holes (121) in the second direction of the door leaf in sequence.

2. The automatic plug welding machine for the steel structure door leaf panel according to claim 1, wherein, The rotating mechanism (33) includes: A rotating motor (331) mounted on the movable arm (31); A driving gear (332) fixed to the output shaft of the rotating motor (331); and A driven gear (333) rotatably mounted on the movable arm (31) about an axis and meshing with the driving gear (332); the welding torch (32) is fixed at an eccentric position of the driven gear (333), and the eccentricity is half of the radius of the movement trajectory.

3. The automatic plug welding machine for the steel structure door leaf panel according to claim 2, characterized in that, The eccentricity is 4.5 - 5.5 mm.

4. The automatic plug welding machine for the steel structure door leaf panel according to claim 1, characterized in that The longitudinal driving mechanism (5) includes: A rotating shaft (51) extending transversely, both ends of the rotating shaft (51) are rotatably connected with a moving seat (52), and the moving seat (52) is slidably mounted longitudinally on the working platform (1); A first motor (53) provided on the sliding bracket (2), and the output shaft of the first motor (53) is fixedly connected with the rotating shaft (51); A first gear (54) fixedly connected to the rotating shaft (51); and A first rack (55) extending longitudinally and meshing with the first gear (54), provided on the working platform (1), and the first motor (53) drives the first gear (54) to rotate, thereby driving the sliding bracket (2) to move longitudinally.

5. The automatic plug welding machine for the steel structure door leaf panel according to claim 4, characterized in that, A lower frame (12) is provided on the working platform (1), a longitudinal guide rail (13) is provided on the lower frame (12), the sliding bracket (2) is slidably mounted on the longitudinal guide rail (13), and the first rack (55) is provided on the lower frame (12).

6. The automatic plug welding machine for the steel structure door leaf panel according to claim 1, characterized in that, The transverse driving mechanism (4) includes: A second motor (41) provided on the welding machine (3); A second gear (42) fixed to the output shaft of the second motor (41); and The second rack (43) extends transversely and meshes with the second gear (42). It is arranged on the sliding bracket (2). The second motor (41) drives the second gear (42) to rotate, thereby driving the welding machine (3) to move transversely.

7. The automatic plug welding machine for the steel structure door leaf panel according to claim 6, characterized in that A transverse guide rail (23) is arranged on the sliding bracket (2), and the welding machine (3) is slidably mounted on the transverse guide rail (23).

8. The automatic plug welding machine for the steel structure door leaf panel according to claim 1, characterized in that, The welding torch (32) is a CO2 gas shielded welding torch.

9. The automatic plug welding machine for the steel structure door leaf panel according to claim 1, characterized in that, Positioning blocks (11) are arranged around the installation station on the working platform (1), and the positioning blocks (11) are used to abut against the periphery of the door leaf.

10. An automatic welding method for plug welding of a steel structure door leaf panel, characterized in that, Based on the automatic plug welding machine for the steel structure door leaf panel according to any one of claims 1 to 9, the following steps are included: Install the door leaf on the working platform (1); Transverse movement: Start the transverse drive mechanism (4) to drive the welding machine (3) to slide transversely, so that the welding torches (32) of multiple welding machines (3) correspond to multiple plug welding holes (121) in the first direction of the door leaf; Welding: When the welding torch (32) corresponds to the plug welding hole (121), start the welding torch (32) and the rotating mechanism (33). The rotating mechanism (33) drives the welding torch (32) to move, so that the welding torch (32) has a circular movement trajectory with the center of the plug welding hole (121) as the center, so that the welding torch (32) rotates and welds while moving; Longitudinal movement: Start the longitudinal drive mechanism (5) to drive the sliding bracket (2) to slide intermittently longitudinally, so that the welding torches (32) of multiple welding machines (3) correspond to multiple plug welding holes (121) in the second direction of the door leaf in sequence, and repeat the welding step.

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