A convenient door frame welding production line

Abstract

The invention discloses a convenient door frame welding production line, wherein the conveying device comprises a conveying guide rail and a conveying trolley, the conveying trolley is movably arranged on the conveying guide rail, and a first roller group is arranged on the top of the conveying trolley; the door frame assembly welding device is used to weld and assemble four frames into a door frame body, and the bending forming device comprises a support seat and a plurality of bending modules, and the bending modules are distributed around the upper surface of the support seat; the assembly forming welding device comprises a gantry, a workbench and a welding module, and the gantry is respectively provided with a workbench and a welding module on both sides of the conveying guide rail, the workbench is arranged at the bottom of the gantry, and the welding module is arranged at the top of the gantry; the top of the workbench is provided with a second roller group having the same rotation direction and height as the first roller group of the conveying trolley. The convenient door frame welding production line solves the problem of high technical requirements for workers in the existing welding process and improves the quality of the weld seam.

Description

Technical Field

[0001] The invention relates to the technical field of civil air defense doors, in particular to a convenient door frame welding production line. Background Art

[0002] Civil defense doors are the doors at the entrances and exits of people's defense projects. There are distinct classifications of civil defense doors, including ordinary single-leaf and double-leaf protective closed doors, as well as single-leaf and double-leaf protective closed doors with movable thresholds, and other types of civil defense equipment.

[0003] The existing civil air defense door is composed of a door frame body and a rectangular frame. The current civil air defense door frame welding is done by manually fixing the door frame parts on the tooling and then welding them. The door frame body and the rectangular frame are produced separately and then welded together manually. The production of the entire door frame is completed by the staff, which has high technical requirements on the staff, and the quality of the welds produced by manual welding cannot be uniform. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to propose a convenient door frame welding production line to realize production automation, thereby solving the problem of high technical requirements for workers in the existing welding process, improving the quality of welding welds, and improving production efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: a convenient door frame welding production line, including a conveying device, a door frame assembly welding device, a bending forming device and an assembly forming welding device;

[0006] The conveying device comprises a conveying guide rail and a conveying trolley, wherein the conveying trolley is movably arranged on the conveying guide rail, and a first roller set is arranged on the top of the conveying trolley, wherein the rotation direction of the first roller set is perpendicular to the moving direction of the conveying trolley;

[0007] The door frame assembly welding device is arranged at the starting end of the conveying guide rail, and is used to weld four side frames into a door frame body.

[0008] The edge bending device is also arranged at the starting end of the conveying guide rail, and the edge bending device comprises a support seat and a plurality of bending modules, wherein the bending modules are distributed around the upper surface of the support seat, and the bending modules are used to bend the metal sheet into a rectangular frame;

[0009] The assembly forming welding device is arranged at the end of the conveying guide rail, and the assembly forming welding device comprises a gantry, a workbench and a welding module. The conveying guide rail passes through the gantry, and the gantry is provided with the workbench and the welding module on both sides of the conveying guide rail, respectively. The workbench is arranged at the bottom of the gantry, and the welding module is arranged at the top of the gantry;

[0010] A second roller set having the same rotation direction and height as the first roller set of the conveying trolley is provided on the top of the workbench.

[0011] For example, the conveying trolley further includes a plurality of first positioning modules, the first roller group includes a plurality of conveying rollers, the first positioning module is arranged between two adjacent conveying rollers, the first positioning module is provided with a first lifting portion, and the direction of the first lifting portion is upward.

[0012] It is worth noting that the first positioning modules are evenly distributed around the conveying vehicle.

[0013] Optionally, the workbench further includes a plurality of second positioning modules, the second roller group includes a plurality of guide rollers, the second positioning module is arranged between two adjacent guide rollers, the second positioning module is provided with a second lifting portion, and the second lifting portion is directed upward.

[0014] Specifically, the workbench is provided with four second positioning modules, and the second positioning modules are evenly distributed at the four corners of the workbench;

[0015] The guide rollers of the second roller group are arranged at both ends of the workbench.

[0016] Preferably, the welding module includes a rotating part, a first arm, a second arm and a welding part, the rotating part is rotatably connected to the top of the gantry, the first arm is hinged to the rotating part, the second arm is hinged to the first arm, and the end of the second arm is rotatably connected to the welding part.

[0017] For example, the bending module includes a fixed column, a chassis and a guide handle, the fixed column is vertically arranged on the upper surface of the support seat, the chassis is movably sleeved between the support seat and the fixed column, the guide handle is fixedly connected to the chassis, the guide handle is provided with a guide column parallel to the fixed column, a guide gap is provided between the fixed column and the guide column, and the guide gap is used to guide the metal sheet.

[0018] It is worth noting that the support seat includes a first movable platform and a second movable platform, the first movable platform and the second movable platform are symmetrically arranged on the top of the base frame through curved edge guide rails, and the first movable platform and the second movable platform move along the curved edge guide rails to adjust the distance between the first movable platform and the second movable platform;

[0019] The first movable platform has two ends perpendicular to its moving direction, each of which is provided with a bending module; the second movable platform has two ends perpendicular to its moving direction, each of which is provided with a bending module.

[0020] Optionally, the door frame assembly welding device comprises two fixing seats, a door frame fixing frame and a clamping assembly installed on the door frame fixing frame;

[0021] The door frame fixing frame includes a connecting rod, a movable rod and a fixed shaft; the left and right ends of the fixed shaft are rotatably connected to the two fixing seats respectively; the connecting rod is located at the front side of the fixed shaft, and the movable rod is located at the rear side of the fixed shaft;

[0022] The clamping assembly includes a first clamping device, two second clamping devices and a third clamping device. The first clamping device is arranged on the connecting rod, the two second clamping devices are respectively arranged on the left and right ends of the fixed shaft, and the third clamping device is arranged on the movable rod.

[0023] Specifically, the door frame fixing bracket further includes a width adjustment rod, the width adjustment rod is connected to the rear side of the fixed shaft, and the movable rod is detachably connected to the width adjustment rod.

[0024] The beneficial effects of the present invention are as follows: the convenient door frame welding system provides that after the door frame assembly welding device and the bending forming device are preliminarily assembled into a door frame body and a rectangular frame respectively, they are transported to the assembly forming welding device through the conveying device, and then the door frame body and the rectangular frame are automatically welded into shape by the welding module of the assembly forming welding device, thereby realizing production automation, thereby solving the problem of high technical requirements for workers in the existing welding process, improving the quality of welding welds, and improving production efficiency.

[0025] During production, firstly, a fixed point is welded at the connecting part of the four frames in the door frame assembly welding device, so that the four frames are initially fixed into the door frame body. At the same time, a metal sheet is placed in the bending forming device, and then the metal sheet is guided by the bending module, and is circled around the upper surface of the support seat and then connected to form a rectangular frame. Then, the door frame body and the rectangular frame are placed on the upper surface of the first roller group of the conveying trolley of the conveying device, and the door frame body and the rectangular frame follow the conveying trolley along the conveying guide rail to the bottom of the gantry of the assembly forming welding device. At this time, the first roller group of the conveying trolley is in a straight line with the second roller group of the workbench. The door frame body and the rectangular frame located on the upper surface of the first roller group move along the rotation direction of the first roller group to the upper surface of the second roller group, and then the welding module welds the door frame body and the rectangular frame located on the upper surface of the second roller group. Since the gantry is provided with the workbench and welding module on both sides of the conveying guide rail, the workbench and welding module at one end can also convey another set of door frame bodies and rectangular frames to the workbench and welding module at the other end when they are working. Therefore, the assembly forming welding device can weld two sets of door frame bodies and rectangular frames at the same time, further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a left side view of an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 An enlarged schematic diagram of the structure of the portion circled by the dotted circle A in the illustrated embodiment;

[0028] Figure 3 is a top view of an embodiment of the present invention;

[0029] Figure 4 is a top view of a flanging forming device in one embodiment of the present invention;

[0030] Figure 5 yes Figure 2 An enlarged schematic diagram of the structure of the portion circled by the dotted circle B in the illustrated embodiment;

[0031] Figure 6 is a front view of a flanging forming device in one embodiment of the present invention;

[0032] Figure 7 is a top view of a door frame assembly welding device in one embodiment of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a welding module in one embodiment of the present invention.

[0034] Wherein: 1 conveying device; 11 conveying guide rail; 12 conveying trolley; 121 first positioning module; 1211 first lifting part; 122 conveying roller; 2 assembly forming welding device; 21 workbench; 211 guide roller; 212 second positioning module; 2121 second lifting part; 22 gantry; 23 welding module; 231 rotating part; 232 first arm; 233 second arm; 234 welding part; 3 bending forming device; 31 support seat; 311 movable table; 32 bending guide rail; 33 chassis; 34 bending module; 341 fixed column; 342 chassis; 343 guide handle; 344 guide column; 345 guide gap; 4 door frame assembly welding device; 41 fixed seat; 421 connecting rod; 422 movable rod; 423 fixed shaft; 424 width adjustment rod; 431 first clamping device; 432 second clamping device; 433 third clamping device. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0037] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 the present invention can be understood according to specific circumstances.

[0039] Combine the following Figures 1 to 8, describing a convenient door frame welding production line according to an embodiment of the present invention, comprising a conveying device 1, a door frame assembly welding device 4, a bending forming device 3 and an assembly forming welding device 2;

[0040] The conveying device 1 comprises a conveying guide rail 11 and a conveying trolley 12, wherein the conveying trolley 12 is movably arranged on the conveying guide rail 11, and a first roller group is arranged on the top of the conveying trolley 12, wherein the rotation direction of the first roller group is perpendicular to the moving direction of the conveying trolley 12;

[0041] The door frame assembly welding device 4 is arranged at the starting end of the conveying guide rail 11, and the door frame assembly welding device 4 is used to weld four side frames into a door frame body.

[0042] The bending forming device 3 is also arranged at the starting end of the conveying guide rail 11. The bending forming device 3 comprises a support seat 31 and a plurality of bending modules 34. The bending modules 34 are distributed around the upper surface of the support seat 31. The bending modules 34 are used to bend the metal sheet into a rectangular frame.

[0043] The assembly forming welding device 2 is arranged at the end of the conveying guide rail 11, and the assembly forming welding device 2 includes a gantry 22, a workbench 21 and a welding module 23. The conveying guide rail 11 passes through the gantry 22. The gantry 22 is provided with the workbench 21 and the welding module 23 on both sides of the conveying guide rail 11, respectively. The workbench 21 is arranged at the bottom of the gantry 22, and the welding module 23 is arranged at the top of the gantry 22.

[0044] A second roller group having the same rotation direction and height as the first roller group of the conveying trolley 12 is disposed on the top of the workbench 21 .

[0045] The convenient door frame welding system provides that after the door frame assembly welding device 4 and the bending forming device 3 are preliminarily assembled into a door frame body and a rectangular frame respectively, they are transported to the assembly forming welding device 2 through the conveying device 1, and then the door frame body and the rectangular frame are automatically welded into shape through the welding module 23 of the assembly forming welding device 2, thereby realizing production automation, thereby solving the problem of high technical requirements for workers in the existing welding process, improving the quality of welding welds, and improving production efficiency.

[0046] During production, firstly, a fixed point is welded at the connecting part of the four frames in the door frame assembly welding device 4, so that the four frames are initially fixed into the door frame body. At the same time, a metal sheet is placed in the bending forming device 3, and then the metal sheet is guided by the bending module 34, and is circled around the upper surface of the support seat 31 and then connected to form a rectangular frame. Then, the door frame body and the rectangular frame are placed on the upper surface of the first roller group of the conveying trolley 12 of the conveying device 1, and the door frame body and the rectangular frame follow the conveying trolley 12 and move along the conveying guide rail 11 to the bottom of the gantry 22 of the assembly forming welding device 2. At this time, the first roller group of the conveying trolley 12 is in a straight line with the second roller group of the workbench 21. The door frame body and the rectangular frame located on the upper surface of the first roller group move to the upper surface of the second roller group along the rotation direction of the first roller group, and then the welding module 23 welds the door frame body and the rectangular frame located on the upper surface of the second roller group. Since the gantry 22 is provided with the workbench 21 and the welding module 23 on both sides of the conveying guide rail 11, the workbench 21 and the welding module 23 at one end can also convey another set of door frame bodies and rectangular frames to the workbench 21 and the welding module 23 at the other end when they are working. Therefore, the assembly forming welding device 2 can weld two sets of door frame bodies and rectangular frames at the same time, further improving production efficiency.

[0047] In some embodiments, Figure 2 As shown, the conveying trolley 12 also includes a plurality of first positioning modules 121, the first roller group includes a plurality of conveying rollers 122, the first positioning module 121 is arranged between two adjacent conveying rollers 122, the first positioning module 121 is provided with a first lifting portion 1211, and the direction of the first lifting portion 1211 is upward.

[0048] The first positioning module 121 is preferably a cylinder, and the first lifting part 1211 is arranged at the output end of the first positioning module 121. When the door frame body and the rectangular frame are placed on the upper surface of the first roller group of the conveying trolley 12, the output end of the first positioning module 121 drives the first lifting part 1211 to lift, and the first lifting part 1211 passes through the gap between two adjacent conveying rollers 122 and lifts the door frame body and the rectangular frame, and the bottom surface of the door frame body and the rectangular frame leaves the upper surface of the first roller group. At this time, the door frame body and the rectangular frame are supported by the first positioning module 121, and when the conveying trolley 12 moves, the door frame body and the rectangular frame will not move with the first roller group.

[0049] For example, the first positioning modules 121 are evenly distributed around the conveying vehicle 12 .

[0050] When the door frame body and the rectangular frame are lifted up by the above design, the supporting points of the first positioning module 121 are evenly located on the bottom surfaces of the door frame body and the rectangular frame, thereby preventing the door frame body and the rectangular frame from sliding down due to uneven supporting force.

[0051] It is worth mentioning that the workbench 21 also includes a plurality of second positioning modules 212, the second roller group includes a plurality of guide rollers 211, the second positioning module 212 is arranged between two adjacent guide rollers 211, the second positioning module 212 is provided with a second lifting portion 2121, and the direction of the second lifting portion 2121 is upward.

[0052] The second positioning module 212 is preferably a cylinder, and the second lifting part 2121 is arranged at the output end of the second positioning module 212. When the conveying trolley 12 runs to the right below the gantry 22, the output end of the first positioning module 121 drives the first lifting part 1211 to descend, and the door frame body and the rectangular frame fall on the first roller group, and the door frame body and the rectangular frame are transported to the upper surface of the guide roller 211 of the second roller group of the workbench 21 through the roller of the first roller group, and then the output end of the second positioning module 212 drives the second lifting part 2121 to lift, and the second lifting part 2121 passes through the gap between two adjacent guide rollers 211 and lifts the door frame body and the rectangular frame, and the bottom surface of the door frame body and the rectangular frame leaves the upper surface of the second roller group, and at this time, the door frame body and the rectangular frame are supported by the second positioning module 212, and the problem of sliding of the door frame body and the rectangular frame causing the welding position to be wrong can be avoided when the welding module 23 is welding.

[0053] Alternatively, if Figure 3 As shown, the workbench 21 is provided with four second positioning modules 212, and the second positioning modules 212 are evenly distributed at the four corners of the workbench 21;

[0054] The guide rollers 211 of the second roller group are disposed at two ends of the workbench 21 .

[0055] The workbench 21 is rectangular in shape, and the second positioning modules 212 located at the four corners of the workbench 21 correspond to the four corners of the door frame body and the rectangular frame one by one. Therefore, the second positioning modules 212 support the door frame body and the rectangular frame, so that the door frame body and the rectangular frame can be kept balanced. In addition, four second positioning modules 212 are sufficient to support the door frame body and the rectangular frame without adding additional supporting structures, thereby reducing production costs. Since the door frame body and the rectangular frame are both hollow structures, only the frame needs to be supported during transportation. Compared with the structure in which the entire long roller shaft spans the workbench 21, the above structure can support the frame of the door frame body and the rectangular frame while eliminating the need for the material of the long roller shaft located below the hollow structure of the door frame body and the rectangular frame, thereby reducing production costs.

[0056] Specifically, Figure 8 As shown, the welding module 23 includes a rotating part 231, a first arm 232, a second arm 233 and a welding part 234, the rotating part 231 is rotatably connected to the top of the gantry 22, the first arm 232 is hinged to the rotating part 231, the second arm 233 is hinged to the first arm 232, and the end of the second arm 233 is rotatably connected to the welding part 234.

[0057] The welding module 23 is driven by a motor, through the rotating part 231, the first arm 232, the second arm 233 and the welding part 234, so that the working area of ​​the welding module 23 covers the entire upper surface of the workbench 21, thereby achieving the purpose of automatic welding.

[0058] Preferably, Figure 4 and 5 As shown, the bending module 34 includes a fixed column 341, a chassis 342 and a guide handle 343. The fixed column 341 is vertically arranged on the upper surface of the support seat 31. The chassis 342 is movably sleeved between the support seat 31 and the fixed column 341. The guide handle 343 is fixedly connected to the chassis 342. The guide handle 343 is provided with a guide column 344 parallel to the fixed column 341. A guide gap 345 is provided between the fixed column 341 and the guide column 344. The guide gap 345 is used to guide the metal sheet.

[0059] The metal sheet is passed through the guide gap 345, and the guide handle 343 is used to drive the chassis 342 to rotate in the direction of the metal sheet passing through, so that the position of the metal sheet located in the guide gap 345 can be bent to form a rectangular corner. After the metal sheet is bent four times, a rectangular frame can be formed. The above structure can make the bending position and bending angle of the metal sheet more accurate, thereby improving the quality of the door frame.

[0060] In some embodiments, Figure 6 As shown, the support seat 31 includes a first movable platform 311 and a second movable platform 312, and the first movable platform 311 and the second movable platform 311 are symmetrically arranged on the top of the bottom frame 33 through the curved edge guide rail 32 respectively, and the first movable platform 311 and the second movable platform 311 are moved on the curved edge guide rail 32 to adjust the distance between the first movable platform 311 and the second movable platform 311;

[0061] A bending module 34 is provided at both ends of the first movable platform 311 perpendicular to the moving direction thereof, and a bending module 34 is provided at both ends of the second movable platform 311 perpendicular to the moving direction thereof.

[0062] When the first movable platform 311 and the second movable platform 311 increase the distance therebetween by moving, the distance between the two bending modules 34 located on the same side of the first movable platform 311 and the second movable platform 311 also increases, thereby achieving the purpose of adjusting the size of the rectangular frame.

[0063] For example, Figure 7 As shown, the door frame assembly welding device 4 includes two fixing seats 41, a door frame fixing frame and a clamping assembly installed on the door frame fixing frame;

[0064] The door frame fixing frame includes a connecting rod 421, a movable rod 422 and a fixed shaft 423; the left and right ends of the fixed shaft 423 are rotatably connected to the two fixing seats 41 respectively; the connecting rod 421 is located at the front side of the fixed shaft 423, and the movable rod 422 is located at the rear side of the fixed shaft 423;

[0065] The clamping assembly includes a first clamping device 431, two second clamping devices 432 and a third clamping device 433. The first clamping device 431 is arranged on the connecting rod 421, the two second clamping devices 432 are respectively arranged on the left and right ends of the fixed shaft 423, and the third clamping device 433 is arranged on the movable rod 422.

[0066] The door frame body includes four frames, two of which are long frames and two are short frames. The door frame fixing frame clamps the four frames of the door frame body through the clamping assembly, so that the four frames of the door frame body can be fixed on the door frame fixing frame, which is convenient for positioning welding. Among them, one long frame is fixed to the connecting rod 421 through the first clamping device 431, and the other long frame is fixed to the movable rod 422 through the third clamping device 433; and the two short frames are respectively fixed to the left and right ends of the fixed shaft 423 through the second clamping device 432. Through the clamping of the first clamping device 431, the second clamping device 432 and the third clamping device 433, the four frames can be connected end to end to form a door frame structure. After the four frames are fixed, a fixed point is welded at the connecting parts of the four frames to preliminarily fix the four frames into the door frame body.

[0067] It is worth noting that the door frame fixing frame further includes a width adjustment rod 424 , the width adjustment rod 424 is connected to the rear side of the fixed shaft 423 , and the movable rod 422 is detachably connected to the width adjustment rod 424 .

[0068] The user can adjust the position of the movable rod 422 on the width adjustment rod 424 according to the size of the door frame to be welded to change the distance between the first clamping device 431 and the third clamping device 433 so that the distance is adapted to the width of the door frame, thereby achieving the purpose of fixing and welding door frames of different widths.

[0069] Other structures and operations of a convenient door frame welding production line according to an embodiment of the present invention are known to ordinary technicians in the field and will not be described in detail here.

[0070] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] Although the 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 claims and their equivalents.

Claims

1. A convenient door frame welding production line, including a conveying device, a door frame assembly welding device, a bending forming device and an assembly forming welding device; Features: The conveying device comprises a conveying guide rail and a conveying trolley, wherein the conveying trolley is movably arranged on the conveying guide rail, and a first roller set is arranged on the top of the conveying trolley, wherein the rotation direction of the first roller set is perpendicular to the moving direction of the conveying trolley; The door frame assembly welding device is arranged at the starting end of the conveying guide rail, and is used to weld four side frames into a door frame body. The bending forming device is also arranged at the starting end of the conveying guide rail, and the bending forming device includes a support seat and a plurality of bending modules, and the bending modules are distributed around the upper surface of the support seat, and the bending modules are used to bend the metal sheet into a rectangular frame, and the bending module includes a fixed column, a chassis and a guide handle, and the fixed column is vertically arranged on the upper surface of the support seat, and the chassis is movably sleeved between the support seat and the fixed column, and the guide handle is fixedly connected to the chassis, and the guide handle is provided with a guide column parallel to the fixed column, and a guide gap is provided between the fixed column and the guide column, and the guide gap is used to guide the metal sheet; The assembly forming welding device is arranged at the end of the conveying guide rail, and the assembly forming welding device comprises a gantry, a workbench and a welding module, and the welding module comprises a rotating part, the conveying guide rail passes through the gantry, and the gantry is provided with the workbench and the welding module on both sides of the conveying guide rail, respectively, the workbench is arranged at the bottom of the gantry, the welding module is arranged at the top of the gantry, and the rotating part is rotatably connected to the top of the gantry; A second roller set having the same rotation direction and height as the first roller set of the conveying trolley is provided on the top of the workbench.

2. A convenient door frame welding production line according to claim 1, characterized in that: The conveying trolley also includes a plurality of first positioning modules, the first roller group includes a plurality of conveying rollers, the first positioning module is arranged between two adjacent conveying rollers, the first positioning module is provided with a first lifting portion, and the direction of the first lifting portion is upward.

3. A convenient door frame welding production line according to claim 2, characterized in that: The first positioning modules are evenly distributed around the conveying vehicle.

4. A convenient door frame welding production line according to claim 1, characterized in that: The workbench also includes a plurality of second positioning modules, the second roller group includes a plurality of guide rollers, the second positioning module is arranged between two adjacent guide rollers, the second positioning module is provided with a second lifting portion, and the second lifting portion is directed upward.

5. A convenient door frame welding production line according to claim 4, characterized in that: The workbench is provided with four second positioning modules, and the second positioning modules are evenly distributed at the four corners of the workbench; The guide rollers of the second roller group are arranged at two ends of the workbench.

6. A convenient door frame welding production line according to claim 1, characterized in that: The welding module includes a first arm, a second arm and a welding part. The first arm is hinged to the rotating part, the second arm is hinged to the first arm, and the end of the second arm is rotatably connected to the welding part.

7. A convenient door frame welding production line according to claim 1, characterized in that: The support base includes a first movable platform and a second movable platform, the first movable platform and the second movable platform are symmetrically arranged on the top of the base frame through curved edge guide rails, and the first movable platform and the second movable platform move along the curved edge guide rails to adjust the distance between the first movable platform and the second movable platform; The first movable platform has two ends perpendicular to its moving direction, each of which is provided with a bending module; the second movable platform has two ends perpendicular to its moving direction, each of which is provided with a bending module.

8. A convenient door frame welding production line according to claim 7, characterized in that: The door frame assembly welding device comprises two fixing seats, a door frame fixing frame and a clamping assembly installed on the door frame fixing frame; The door frame fixing frame includes a connecting rod, a movable rod and a fixed shaft; the left and right ends of the fixed shaft are rotatably connected to the two fixing seats respectively; the connecting rod is located at the front side of the fixed shaft, and the movable rod is located at the rear side of the fixed shaft; The clamping assembly includes a first clamping device, two second clamping devices and a third clamping device. The first clamping device is arranged on the connecting rod, the two second clamping devices are respectively arranged on the left and right ends of the fixed shaft, and the third clamping device is arranged on the movable rod.

9. A convenient door frame welding production line according to claim 8, characterized in that: The door frame fixing bracket further comprises a width adjustment rod, the width adjustment rod is connected to the rear side of the fixing shaft, and the movable rod is detachably connected to the width adjustment rod.

Images