Multi-gun bed welding machine for side wall frame

Abstract

The side wall frame multi-gun-bed welding machine comprises a welding conveying mechanism arranged on a conveying support, a fixing mechanism is arranged on the welding conveying mechanism, a welding support is installed on the conveying support, and an inner side welding mechanism for welding the inner side of a side wall frame and an end welding mechanism for welding the end of the side wall frame are arranged on the welding support. An outer side welding mechanism used for welding the outer side of the side wall frame is arranged on the welding table, a wire feeding rack is arranged on one side of the welding table, and a plurality of welding machines and wire feeding mechanisms are arranged on the wire feeding rack. According to the side wall frame welding device, full-automatic fixing, positioning and automatic welding of the side wall frame are achieved, the side wall frame welding device has the advantages of being high in welding efficiency and good in welding effect, the labor intensity of workers is greatly reduced, and the labor cost of enterprises is reduced; the problems that the welding efficiency is low, the welding effect is poor, the labor intensity of workers is high and the labor cost of enterprises is high due to the fact that a side wall frame is welded and machined manually in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding machine field especially relates to a side frame multi-gun bed welding machine. BACKGROUND

[0002] The side frame is a kind of product that is very flexible to assemble, and is widely used in highways, railways and highways etc.;It can be made into permanent net wall, and can also be used as temporary isolation net, and only different column fixing methods are needed to realize it.The side frame is mainly composed of two side long bars, a plurality of horizontal bars connected to the two side long bars and an end bar at one end thereof, and the welding of the conventional side frame is to place the long bar (end bar), side long bar and horizontal bar on the jig of welding station first, fix the long bar, side long bar and horizontal bar by clamp, then manually hold welding gun to weld, when the side frame is welded, manually release the clamp and take down the side frame, so as to repeatedly realize the welding production and processing of the side frame, and the manual welding method leads to low welding efficiency, high labor intensity of workers and high labor cost of enterprises. SUMMARY

[0003] The utility model aims at overcoming the insufficient of prior art, provide a kind of side frame multi-gun bed welding machine.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: the side frame multi-gun bed welding includes conveying support, conveying support one side is equipped with welding table, it is equipped with welding conveying mechanism on conveying support, it is equipped with the fixed mechanism for fixing workpiece on welding conveying mechanism, welding support is installed on the top of conveying support, welding support is equipped with respectively for welding the inside of side frame inside welding mechanism and for welding the end of side frame end welding mechanism, welding table is equipped with outside welding mechanism for welding the outside of side frame, welding table one side is equipped with wire feeder frame, wire feeder frame is equipped with several welding machines and several wire feeder mechanisms respectively.Wire feeder mechanism is used for welding tin wire, conventional wire feeder mechanism is composed of wire feeder motor, speed regulator, speed reducer, wire feeder roller and wire feeder hose etc., and its working principle is well known, which will not be explained in detail here.

[0005] More specifically, the fixed mechanism includes a jig frame, a plurality of horizontal bar jigs are equidistantly arranged on the jig frame along the long side direction, a long bar fixing seat is arranged on both end portions of each horizontal bar jig, a groove is recessed inward from the top surface of the long bar fixing seat, a side long bar is placed in the groove of the long bar fixing seat on the same side of the jig frame, the long bar fixing seats on the same side of the jig frame fix and limit the same side long bar through the grooves, and an end bar jig is arranged on one end portion of the jig frame. The two end portions of the two side long bars are respectively supported by the end bar.

[0006] The two ends of the end rod jig extend upward and are respectively provided with a reference seat, and the top surface of the middle part of the end rod jig is provided with a first limiting device.

[0007] By adopting the technical scheme, the side length rod of the side frame takes the inner side wall of the reference seat as a reference, the end rod of the side frame takes the other inner side of the reference seat as a reference, the first limiting device tightens the end rod on the inner side wall of the reference seat, and the two ends of the end rod support the ends of the corresponding side length rods, so that the ends of the end rod and the ends of the side length rod are fixed and positioned.

[0008] Specifically, the cross rod jig extends upward at one end in the short edge direction and is provided with a reference convex strip for limiting the cross rod, and the top surface of the middle part of the cross rod jig is provided with a second limiting device.

[0009] By adopting the technical scheme, the cross rod takes the reference convex strip as a reference, and the second limiting device tightens the cross rod on the side surface of the reference convex strip to achieve fixed limiting of the cross rod.

[0010] Specifically, the cross rod jig further comprises two third limiting devices arranged thereon, and the two third limiting devices are arranged back to back, and each of the two third limiting devices comprises a rotary air cylinder, the output end of the rotary air cylinder is provided with a swing rod, the swing end of the swing rod is provided with a pressing rod, the rotary air cylinder rotates and tightens the swing rod, and the swing rod drives the pressing rod to tighten the side length rod in the length rod fixing seat.

[0011] By adopting the technical scheme, the two third limiting devices can be flexibly selected to be arranged on all or part of the cross rod jigs according to the needs of fixing the side length rod, and the cross rod jigs provided with the two third limiting devices can tighten the corresponding side length rods in the length rod fixing seats on the same side through the two third limiting devices.

[0012] As a preferred, the end welding mechanism comprises a module fixed mounting plate, the module fixed mounting plate is provided with a first driving device, the first driving device is provided with a sliding table mounting plate, and the sliding table mounting plate is provided with two oppositely arranged end welding assemblies.

[0013] Specifically, the end welding assembly comprises a first two-dimensional fine adjustment sliding table, the first two-dimensional fine adjustment sliding table is provided with a first welding gun clamp, and the first welding gun clamp is provided with a first welding gun.

[0014] The first two-dimensional fine adjustment sliding table is adopted to horizontally position and adjust the first welding gun in two-dimensional space, the first welding gun clamp adjusts the welding angle of the first welding gun, and the two end welding assemblies move up and down under the driving of the first driving device, so that the first welding guns on the two end welding assemblies can be driven to move downward and be positioned on the inner side of the end of the side frame, and the end of the side frame can be welded and processed.

[0015] Preferably, the inner welding mechanism comprises a second driving device, the output end of the second driving device is provided with a horizontal plate, the bottom surface of the two end portions of the horizontal plate is respectively provided with a positioning rod clamp block, the two positioning rod clamp blocks are commonly provided with a positioning rod, the two end portions of the positioning rod are respectively provided with a positioning adjusting clamp block, and the two positioning adjusting clamp blocks are respectively provided with an inner welding assembly.

[0016] The inner welding assembly comprises a second two-dimensional fine adjustment sliding table, the second two-dimensional fine adjustment sliding table is provided with a second welding gun clamp, and the second welding gun clamp is provided with a second welding gun.

[0017] The second two-dimensional fine adjustment sliding table is used for positioning and adjusting the second welding gun, the second welding gun clamp is used for adjusting the spot welding angle of the second welding gun, and the second driving device drives the second welding guns on the two inner welding assemblies to be positioned on the inner side of the side wall frame for welding.

[0018] Preferably, the outer welding mechanism comprises a cylinder mounting plate mounted on the welding table, the cylinder mounting plate is provided with a third driving device, the third driving device is connected with a third two-dimensional fine adjustment sliding table, and the third two-dimensional fine adjustment sliding table is provided with a third welding gun.

[0019] The third two-dimensional fine adjustment sliding table is used for positioning and adjusting the third welding gun, and the third driving device drives the third welding gun to be positioned on the outer side of the side wall frame for welding.

[0020] Preferably, the welding conveying mechanism comprises a fourth driving device mounted on a conveying support, the fourth driving device is provided with a moving frame, and two fixing mechanisms are provided, and the two fixing mechanisms are respectively mounted on the two end portions of the moving frame.

[0021] Specifically, the first two-dimensional fine adjustment sliding table, the second two-dimensional fine adjustment sliding table and the third two-dimensional fine adjustment sliding table are all two-dimensional fine adjustment sliding tables on the market, and the specific structure and working principle thereof are well known, and will not be explained in detail here.

[0022] Preferably, a controller or a control system is arranged for signal control of the welding conveying mechanism, the inner welding mechanism, the end welding mechanism, the outer welding mechanism and the wire feeding mechanism and the like components, the controller is a PLC programmable logic controller, and the PLC programmable logic controller can adopt a programmable logic controller with a model of XDS-40T-D, but is not limited thereto. The operator can control the automatic operation of each mechanism or component through the controller or the control system.

[0023] Compared with the prior art, the utility model has the advantages that:

[0024] 1、It realizes the switching of workpiece feeding and finished workpiece discharging by setting two fixing mechanisms to alternately convey the end rod (long rod), cross rod and side long rod to the end welding mechanism, inner side welding mechanism and outer side welding mechanism, the end welding mechanism, inner side welding mechanism and outer side welding mechanism can synchronously and automatically weld the side frame, and the welding of the side frame does not need manual participation, so that the welding efficiency is greatly improved, the welding effect is ensured, and the welding production cost is reduced.

[0025] 2、The structure of the fixing mechanism is designed, so that the fixing mechanism can fix and position the end rod, side long rod and cross rod of the side frame, so as to improve the welding precision.

[0026] 3、The structures of the end welding mechanism, inner side welding mechanism and outer side welding mechanism are respectively designed, the end welding mechanism, inner side welding mechanism and outer side welding mechanism can synchronously and automatically weld the side frame, so as to ensure high welding efficiency and good welding effect, and the labor intensity of workers and the labor cost of enterprises are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to facilitate the description, the utility model is described in detail by the following preferred embodiments and drawings.

[0028] Figure 1 It is a perspective view of the side frame multi-gun bed welding machine of the utility model.

[0029] Figure 2 It is a perspective view of the fixing mechanism of the side frame multi-gun bed welding machine of the utility model.

[0030] Figure 3 It is a perspective view of the end welding mechanism of the side frame multi-gun bed welding machine of the utility model.

[0031] Figure 4 It is a perspective view of the inner side welding mechanism of the side frame multi-gun bed welding machine of the utility model.

[0032] Figure 5 It is a perspective view of the outer side welding mechanism of the side frame multi-gun bed welding machine of the utility model.

[0033] Figure 6 It is a perspective view of the welding conveying mechanism of the side frame multi-gun bed welding machine of the utility model. DETAILED DESCRIPTION

[0034] For the convenience of understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0036] Referring to Figure 1 As shown in the utility model discloses a side wall frame multi-gun bed welding machine, including conveying support 1, conveying support 1 one side is equipped with welding table 2, welding transmission mechanism 3 is equipped on conveying support 1, welding transmission mechanism 3 is equipped with the fixed mechanism 4 for fixing workpiece, welding support 5 is installed on conveying support 1, welding support 5 is equipped with respectively welding inside inside welding mechanism 6 of side wall frame and welding end welding mechanism 7 of side wall frame end, welding table 2 is equipped with outside welding mechanism 8 for welding side wall frame outside, welding table 2 one side is equipped with wire feeder frame 9, wire feeder frame 9 is equipped with several welding machines 10 and wire feeder mechanism 11 respectively.

[0037] Referring to Figure 2 As shown in the utility model discloses a side wall frame multi-gun bed welding machine, including conveying support 1, conveying support 1 one side is equipped with welding table 2, welding transmission mechanism 3 is equipped on conveying support 1, welding transmission mechanism 3 is equipped with the fixed mechanism 4 for fixing workpiece, welding support 5 is installed on conveying support 1, welding support 5 is equipped with respectively welding inside inside welding mechanism 6 of side wall frame and welding end welding mechanism 7 of side wall frame end, welding table 2 is equipped with outside welding mechanism 8 for welding side wall frame outside, welding table 2 one side is equipped with wire feeder frame 9, wire feeder frame 9 is equipped with several welding machines 10 and wire feeder mechanism 11 respectively.

[0038] Specifically, the two ends of the end rod jig 45 extend upward and are respectively provided with a reference seat 46, and the top surface of the middle part of the end rod jig 45 is provided with a first limiting device 47.

[0039] Specifically, the reference seat 46 is in the shape of L in cross section, and the two reference seats 46 are mirror-symmetrically arranged.

[0040] Specifically, the first limiting device 47 includes a three-axis cylinder 471 and a pull plate 472, and the output end of the three-axis cylinder 471 is connected and installed with the pull plate 472.

[0041] Specifically, one end of the crossbar jig 42 extends upward in the short direction and is provided with a reference protrusion 48 for limiting the crossbar 14, and the middle top surface of the crossbar jig 42 is provided with a second limiting device 49.

[0042] Specifically, the second limiting device 49 includes a double-shaft air cylinder 491 and a push plate 492, and the output end of the double-shaft air cylinder 491 is connected and installed with the push plate 492. The crossbar 14 is taken as a reference for the reference protrusion 48, the double-shaft air cylinder 491 drives the push plate 492 to press the crossbar 14 on the side surface of the reference protrusion 48, so as to realize the fixed limiting of the crossbar 14.

[0043] Specifically, the crossbar jig 42 further includes a third limiting device 40 arranged on the crossbar jig 42. In the embodiment, two third limiting devices 40 are arranged on the crossbar jig 42. In other examples, the third limiting device 40 can be arranged on the crossbar jig 42 according to the needs of fixing the side long rod 12, or a different number of third limiting devices 40 can be arranged, so it is not limited to this. The two third limiting devices 40 are arranged in a back-to-back manner, and each of the two third limiting devices 40 includes a rotary air cylinder 401, the output end of the rotary air cylinder 401 is provided with a swing rod 402, the swing end of the swing rod 402 is provided with a pressing rod 403, the rotary air cylinder 401 rotates and tightens the swing rod 402, and the swing rod 402 drives the pressing rod 403 to press the side long rod 12 in the long rod fixing seat 43.

[0044] Referring to Figure 3 As shown in the figure, the end welding mechanism 7 includes a module fixed mounting plate 71, the module fixed mounting plate 71 is provided with a first driving device 72, the first driving device 72 is provided with a sliding table mounting plate 73, and the sliding table mounting plate 73 is provided with two oppositely arranged end welding assemblies 74.

[0045] Specifically, the first driving device 72 is arranged on the welding support 5 through the module fixed mounting plate 71, one side of the module fixed mounting plate 71 is provided with a baffle 75, and the first driving device 72 and the baffle 75 are located on the same side and are provided with a photoelectric sensor 76. The first driving device 72 includes a first servo motor 721, a first coupling 722, and a ball screw linear module 723, and the output end of the first servo motor 721 is drivingly connected with the ball screw linear module 723 through the first coupling 722. The structure and working principle of the ball screw linear module 723 are well known, and will not be explained in detail here. The ball screw linear module 723 is fixedly installed with the sliding table mounting plate 73 through the sliding seat thereof, so that the sliding table mounting plate 73 and the two end welding assemblies 74 can move up and down together with the sliding of the sliding seat. In other embodiments, the first driving device 72 can also use a belt-driven linear module and a pneumatic linear module, so it is not limited to this.

[0046] Specifically, the end welding assembly 74 comprises a first two-dimensional fine adjustment sliding table 741, the first two-dimensional fine adjustment sliding table 741 is provided with a first welding gun clamp 742, and the first welding gun clamp 742 is provided with a first welding gun 743.

[0047] Referring to Figure 4 As shown in the figure, the inner side welding mechanism 6 comprises a second driving device 61, in this embodiment, the second driving device 61 is a pneumatic cylinder, and in other embodiments, the second driving device 61 can also be an electric cylinder, so it is not limited to this; the output end of the second driving device 61 is provided with a horizontal plate 62, the bottom surface of the two end portions of the horizontal plate 62 is respectively provided with a positioning rod clamp block 63, the two positioning rod clamp blocks 63 are jointly provided with a positioning rod 64, the two end portions of the positioning rod 64 are respectively provided with a positioning adjustment clamp block 65, and the two positioning adjustment clamp blocks 65 are respectively provided with oppositely arranged inner side welding assemblies 66.

[0048] Specifically, the inner side welding assembly 66 comprises a second two-dimensional fine adjustment sliding table 661, the second two-dimensional fine adjustment sliding table 661 is provided with a second welding gun clamp 662, and the second welding gun clamp 662 is provided with a second welding gun 663.

[0049] Referring to Figure 5 As shown in the figure, the outer side welding mechanism 8 comprises a pneumatic cylinder mounting plate 81 mounted on the welding table 2, the pneumatic cylinder mounting plate 81 is provided with a third driving device 82, in this embodiment, the third driving device 82 is a pneumatic cylinder, and in other embodiments, the third driving device 82 can also be an electric cylinder, so it is not limited to this; the third driving device 82 is connected with a third two-dimensional fine adjustment sliding table 83, and the third two-dimensional fine adjustment sliding table 83 is provided with a third welding gun 84.

[0050] Specifically, the welding conveying mechanism 3 comprises a fourth driving device 31 provided on the conveying support 1, the fourth driving device 31 is provided with a moving frame 32, and two fixing mechanisms 4 are provided on the two end portions of the moving frame 32.

[0051] Specifically, the fourth driving device 31 comprises linear sliding modules 33 respectively provided on the two side ends of the conveying support 1, a second servo motor 34, a second coupling 35 and a ball screw assembly 36 connected in sequence are arranged between the two linear sliding modules 33, the ball screw assembly 36 is in transmission connection with the moving frame 32, the second servo motor 34 drives the moving frame 32 to move back and forth on the two linear sliding modules 33 through the second coupling 35 and the ball screw assembly 36, so as to switch the fixing mechanism 4 to realize the switching of the feeding of the workpiece to be welded and the discharging of the finished workpiece. The ball screw assembly 36 comprises a nut fixing seat and a ball screw penetrating through the center of the nut fixing seat.

[0052] Specifically, the linear sliding module 33 comprises a sliding rail and a sliding block sliding on the sliding rail.

[0053] Referring to Figure 1 and Figure 6 As shown in the figure, the welding conveying mechanism 3 is provided with two fixing mechanisms 4, which alternately convey the side long rod 12, the end rod (long rod) 13 and the cross rod 14 to the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8, so as to realize the switching of the feeding of the workpiece to be welded and the discharging of the finished workpiece. In other embodiments, different numbers of fixing mechanisms 4 can be arranged on the welding conveying mechanism 3 according to the needs of use, and it is not limited to this.

[0054] Referring to Figures 1 to 6 As shown in the figure, the working principle of the side frame multi-gun bed welding machine is as follows: first, the side long rod 12, the end rod 13 and the cross rod 14 of the side frame to be welded are respectively placed into the fixing mechanism 4. The long rod fixing seat 43 of the fixing mechanism 4 is recessed from the top surface and provided with a groove 44 for fixing and limiting the side long rod 12, so that the long rod fixing seats 43 on the same side of the jig frame 41 can jointly fix and limit the same side long rod 12. The side long rod 12 is fixed and limited by the reference seat 46 and the inner side wall of the fixing mechanism 4, the end rod 13 is fixed and limited by the reference seat 46 and the other inner side wall, the three-axis cylinder 471 of the first limiting device 47 drives the pull plate 472 to press the end rod 13 on the inner side wall of the reference seat 46, so that the end rod 13 supports the end of the corresponding side long rod 12, which realizes the butt joint fixing and positioning of the end of the end rod 13 and the end of the side long rod 12. The cross rod 14 is fixed and limited by the reference convex strip 48, and the double-axis cylinder 491 of the second limiting device 49 drives the push plate 492 to press the cross rod 14 on the side surface of the reference convex strip 48, which realizes the fixing and limiting of the cross rod 14. The two third limiting devices 40 provided on the cross rod jig 42 are arranged in a back-to-back manner, and when they are extended, they can respectively press the corresponding side long rod 12 on the long rod fixing seat 43 on the same side.

[0055] The wire feeding mechanism 11 feeds solder wire for welding of the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8, the side frame can move to the directly below of the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8 with the fixed mechanism 4 and under the driving of the fourth driving device 31 of the welding conveying mechanism 3, the first welding gun 743 of the end welding mechanism 7 is horizontally two-dimensional spatially positioned and adjusted by the first two-dimensional fine adjustment sliding table 741, the first welding gun 743 can adjust the spot welding angle thereof by the first welding gun clamp 742, the first driving device 72 drives the first welding gun 743 on the two end welding assemblies 74 to be positioned to the end rod 13 of the side frame to weld the end rod 13, the second welding gun 663 of the inner side welding mechanism 6 is horizontally two-dimensional spatially positioned and adjusted by the second two-dimensional fine adjustment sliding table 661, the second welding gun 663 can adjust the spot welding angle thereof by the second welding gun clamp 662, the second driving device 61 drives the second welding gun 663 on the two inner side welding assemblies 66 to be positioned to the cross rod 14 of the side frame to weld the cross rod 14. Similarly, the third welding gun 84 of the outer side welding mechanism 8 is horizontally two-dimensional spatially positioned and adjusted by the third two-dimensional fine adjustment sliding table 83, the third driving device 82 drives the third welding gun 84 to be positioned to the side long rod 12 of the side frame to weld the side long rod 12. The end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8 can synchronously weld the end rod 13, the cross rod 14 and the side long rod 12 of the side frame, when the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8 respectively complete welding of the end rod 13, the cross rod 14 and the side long rod 12 on the fixed mechanism 4, a side frame is welded, which realizes automatic positioning, fixing and automatic welding of the side frame before welding, so that the welding efficiency is high and the welding effect is good, the labor intensity of workers is greatly reduced and the labor cost of enterprises is reduced, thereby solving the problems of low welding efficiency, poor welding effect, high labor intensity of workers and high labor cost of enterprises caused by manual welding of the side frame by a worker holding a welding gun.

[0056] The two fixed mechanisms 4 are arranged to alternately convey the end rod (long rod) 13, the side long rod 12 and the cross rod 14 to be welded by the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8, when the end welding mechanism 7, the inner side welding mechanism 6 and the outer side welding mechanism 8 synchronously weld the side frame on one of the fixed mechanisms 4, the other fixed mechanism 4 can unload finished products and load workpieces to be welded, the two fixed mechanisms 4 alternately switch to work, which can further improve the efficiency of unloading and loading of the side frame and further improve the welding efficiency of the side frame.

[0057] The above embodiment is only one example of the present application, and is not intended to limit the implementation and scope of the present application. Any technical solution that is the same as or equivalent to the content described in the claims of the present application should be included within the scope of the present application.

Claims

1. A side-frame multi-gun welding machine, including a conveyor support, with a welding table on one side of the conveyor support, characterized in that: The conveying support is equipped with a welding conveying mechanism, which is equipped with a fixing mechanism for fixing the workpiece. A welding support is installed on the conveying support, which is equipped with an inner welding mechanism and an end welding mechanism for welding the inner side and the end of the side frame, respectively. An outer welding mechanism for welding the outer side of the side frame is provided on the welding table. A wire feeder frame is provided on one side of the welding table, and several welding machines and several wire feeding mechanisms are provided on the wire feeder frame.

2. The side frame multi-gun welding machine according to claim 1, characterized in that: The fixing mechanism includes a jig frame, on which a plurality of crossbar jigs are equidistantly arranged along the long side. Each crossbar jig has a long rod fixing seat at each of its two ends. The long rod fixing seat has a groove recessed from the top surface inward for fixing and limiting the long rod on the opposite side. The long rod fixing seats on the same side of the jig frame work together to fix and limit the long rod on the same side. An end rod jig is provided at one end of the jig frame.

3. The side frame multi-gun welding machine according to claim 2, characterized in that: The two ends of the end rod fixture are respectively provided with reference seats extending upwards, and the top surface of the middle part of the end rod fixture is provided with a first limiting device. The cross-section of the reference base is L-shaped, and the two reference bases are arranged in a mirror symmetrical manner.

4. The side frame multi-gun welding machine according to claim 2, characterized in that: The crossbar fixture has a reference protrusion extending upward from one end along the short side direction to limit the crossbar, and a second limiting device is provided on the top surface of the middle part of the crossbar fixture.

5. The side frame multi-gun welding machine according to claim 4, characterized in that: The crossbar fixture also includes two third limiting devices mounted thereon. The two third limiting devices are arranged in opposite directions. Each of the two third limiting devices includes a rotary cylinder. The output end of the rotary cylinder is provided with a swing rod. The swing end of the swing rod is provided with a pressure rod. The rotary cylinder rotates and pulls the swing rod tight. The swing rod drives the pressure rod to press the side long rod into the long rod fixing seat.

6. The side frame multi-gun welding machine according to claim 1, characterized in that: The end welding mechanism includes a module fixing mounting plate, a first driving device is provided on the module fixing mounting plate, a slide mounting plate is provided on the first driving device, and two oppositely arranged end welding components are provided on the slide mounting plate. The end welding assembly includes a first two-dimensional fine-tuning slide, the first two-dimensional fine-tuning slide is equipped with a first welding gun clamp, and the first welding gun clamp is equipped with a first welding gun.

7. The side frame multi-gun welding machine according to claim 1, characterized in that: The inner welding mechanism includes a second driving device. A horizontal plate is provided on the output end of the second driving device. Positioning rod clamps are provided on the bottom surfaces of the two ends of the horizontal plate. Positioning rod clamps are jointly equipped with positioning rods. Positioning adjustment clamps are provided on the two ends of the positioning rods. Inner welding components are respectively installed on the two positioning adjustment clamps. The inner welding assembly includes a second two-dimensional fine-tuning slide, on which a second welding gun clamp is mounted, and on which a second welding gun is mounted.

8. The side frame multi-gun welding machine according to claim 1, characterized in that: The outer welding mechanism includes a cylinder mounting plate installed on the welding table. A third driving device is provided on the cylinder mounting plate. The third driving device is connected to a third two-dimensional fine-tuning slide. A third welding torch is installed on the third two-dimensional fine-tuning slide.

9. The side frame multi-gun welding machine according to claim 1, characterized in that: The welding conveying mechanism includes a fourth driving device mounted on a conveying support. The fourth driving device is equipped with a movable frame and two fixing mechanisms, which are mounted on the two ends of the movable frame.

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