Gantry type electric resistance welding equipment for metal net rack machining

Abstract

The invention discloses gantry type electric resistance welding equipment for metal net rack machining. Belongs to the technical field of resistance welding equipment. According to the technical key points, the device comprises a rack, and the rack is sequentially provided with a stacking area, a feeding and discharging transfer area and a welding area in the length direction; the material stacking area comprises an automatic material stacking unit, a material stacking base is arranged in the automatic material stacking unit, and a material stacking module is arranged on the material stacking base in a sliding mode. A first horizontal driving mechanism for driving the stacking module to move to the feeding and discharging transfer area is arranged on the rack; the feeding and discharging transfer area comprises a material returning trolley connected with the material stacking area and a second horizontal driving mechanism connected with the first horizontal driving mechanism and the welding area. The welding area comprises an automatic welding device arranged on the rack and a welding trolley matched with the second horizontal driving mechanism; the gantry type electric resistance welding equipment for metal net frame machining is compact in structure, high in automation program and machining efficiency and stable in work. The device is used for automatically welding the metal net rack.

Description

Technical Field

[0001] This invention relates to a resistance welding equipment, and more specifically, to a gantry-type resistance welding equipment for metal mesh processing. Background Technology

[0002] Resistance welding is a method of welding that uses the resistance heat generated by the current passing through the workpiece and the contact area as a heat source to locally heat the workpiece while simultaneously applying pressure. During welding, no filler metal is required, resulting in high productivity, minimal workpiece deformation, and easy automation. Current resistance welding equipment does not significantly impact efficiency for welding workpieces with small wire diameters or simple designs. However, for space frames with large wire diameters, it suffers from the following disadvantages:

[0003] (1) The wires of the grid structure are crisscrossed, which requires a long time to wire. If manual wire tying is used, it will take even longer.

[0004] (2) There are many welding points during welding, and each welding point requires waiting time, so the welding of the entire space frame takes a long time;

[0005] (3) If the welding and front-end coding time of the space frame are not matched, it will cause a long standby time in one of the workstations. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a gantry-type resistance welding equipment for metal space frame processing that is compact in structure, has a highly automated process, high processing efficiency, and stable operation.

[0007] The technical solution of the present invention is implemented as follows: a gantry-type resistance welding equipment for metal mesh frame processing includes a frame, wherein the frame is provided with a material stacking area, a material feeding and discharging transfer area and a welding area in sequence along the length direction.

[0008] The material stacking area includes an automatic material stacking unit, a material stacking base is provided within the travel range of the automatic material stacking unit, and a material stacking module is slidably mounted on the material stacking base. A first horizontal drive mechanism is provided on the frame to drive the material stacking module to the inlet / outlet transfer area.

[0009] The material handling transfer area includes a material return trolley mounted on the frame and connected to the material stacking area, and a second horizontal drive mechanism mounted on the frame and connected to the first horizontal drive mechanism and the welding area.

[0010] The welding area includes an automatic welding device mounted on a frame and a welding trolley that cooperates with a second horizontal drive mechanism.

[0011] When the welding trolley returns from the welding area to the material transfer area, the unloading trolley lifts the stacking module on the welding trolley and waits. When another stacking module in the stacking area is stacked and sent to the material transfer area by the first horizontal drive mechanism, the unloading trolley sends the completed welding stacking module to the stacking area for re-stacking.

[0012] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the automatic material stacking unit includes a transverse guide rail and a longitudinal guide rail mounted on the frame. A transverse material stacking mechanism is mounted on the transverse guide rail, and a longitudinal material stacking mechanism is mounted on the longitudinal guide rail. The transverse material stacking mechanism and the longitudinal material stacking mechanism have the same structure.

[0013] The transverse stacking mechanism includes mounting plates slidably connected to transverse guide rails, and a horizontal drive mechanism connected to the mounting plates. Connecting rods are provided between the mounting plates, and several mounting seats that can be adjusted along the connecting rods are connected between each connecting rod. Material guiding components are inclinedly arranged on the mounting seats.

[0014] Each mounting base has a material distribution plate module on its side, and the material distribution plate modules are connected in series via a rotating shaft, one end of which is connected to a servo motor. The external wires to be welded on the material guiding assembly are separated one by one by the material distribution plate modules and sent to the material stacking module in the material stacking area.

[0015] In the aforementioned gantry-type resistance welding equipment for metal space frame processing, the material guiding assembly includes positioning baffles symmetrically arranged on mounting seats at both ends, and inclined material guiding plates are provided on the inner side of each positioning baffle. Each material guiding plate is movably inserted through each connecting rod.

[0016] Each positioning baffle is provided with a clearance post between itself and the corresponding mounting base and guide plate. External welding wires are mounted on each guide plate.

[0017] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the radial cross-section of the rotating shaft is polygonal. The material distribution plate module includes a material distribution support fixedly connected to the rotating shaft, a material distribution plate detachably connected to the material distribution support, and positioning notches adapted to the outer diameter of the wire to be welded evenly distributed on the edge of the material distribution plate.

[0018] The mounting base and the guide plate are arranged opposite to each other to form a feeding gap. The distributing plate is located below the feeding gap. An arc-shaped clearance notch that cooperates with the distributing plate is provided on the mounting base at the lower end of the feeding gap. The arc-shaped clearance notch cooperates with the distributing plate to form a guiding gap.

[0019] A guide block is installed on the side of the distribution plate. The guide block is connected to the mounting plate via a polygonal connecting rod. The guide block and the mounting base cooperate to form a discharge gap. The upper end of the discharge gap connects with the outlet end of the guide gap. Each wire to be welded passes through the feeding gap, the guide gap, and the discharge gap in sequence before being output.

[0020] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the material stacking module includes a template frame, with guide wheel assemblies provided at the bottom of the template frame and on both sides along the length of the frame. Several pin positioning blocks are provided on the upper surface of both sides of the template frame along the length of the frame, and positioning holes are provided on the pin positioning blocks.

[0021] At least two template positioning blocks are installed on the template frame, and a space frame template is fixed between the two template positioning blocks.

[0022] The space frame template includes an insulating support plate, on which several transverse positioning modules for positioning transverse wires to be welded are distributed at intervals along the transverse direction, and several longitudinal positioning modules for positioning longitudinal wires to be welded are distributed at intervals along the longitudinal direction.

[0023] The lateral positioning module consists of a positioning groove on the upper surface of the insulating support plate and guide positioning components respectively set at both ends of the positioning groove.

[0024] The longitudinal positioning module includes several high-temperature resistant pads on the surface of an insulating support plate disposed on the side of the positioning groove. Each high-temperature resistant pad is arranged in pairs facing each other to form a positioning gap adapted to the outer diameter of the wire to be welded.

[0025] Positioning elements are provided at both ends of the insulating support plate corresponding to the longitudinal wire to be welded, and at least one of the positioning elements is an elastic positioning element. When the longitudinal wire to be welded is heated and elongated, the elastic positioning element will adaptively retract and make room while clamping.

[0026] A welding clearance groove is provided on the back of the insulating support plate corresponding to the longitudinal wire to be welded, which connects to each positioning groove.

[0027] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the first horizontal drive mechanism includes first guide rods that are parallel to and spaced apart along the length of the frame, and a linkage slide is connected between the first guide rods.

[0028] At least two spaced levers are connected to the linkage slide, and a clearance notch corresponding to each lever is provided on the material stacking base.

[0029] The linkage slide is connected to a first pulley module that is parallel to the first guide rod and is mounted on the frame.

[0030] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, L-shaped guide bars corresponding to the template frames of the stacking modules in the material stacking area are symmetrically arranged on the frame in the material inlet and outlet transfer area. The two L-shaped guide bars cooperate to form a guide groove for the template frame to slide.

[0031] An extension guide strip is connected to one end of the two L-shaped guide strips facing the stacking area. The end of the extension guide strip facing the stacking area is shaped like an 8.

[0032] When the space frame template located in the material stacking area is in the material stacking state, the end of the template frame facing the material transfer area is located inside the extended guide strip.

[0033] The second horizontal drive mechanism is mounted on the frame between two L-shaped guide bars. The second horizontal drive mechanism includes second guide rods that are parallel to and spaced apart along the length of the frame, and a pusher slide is slidably connected between the two second guide rods.

[0034] Two positioning cylinders are arranged vertically at intervals on the pusher slide, and a first positioning pin is connected to the free end of the piston rod of each positioning cylinder.

[0035] Above the pusher slide, a guide positioning plate is connected by a shim sleeve to cooperate with each first positioning pin. The guide positioning plate is provided with a clearance hole that cooperates with the first positioning pin.

[0036] The template frame is fixed with a drive connection plate, and the drive connection plate is provided with connection holes that correspond one-to-one with the two first positioning pins.

[0037] The pusher slide is threadedly connected to a first lead screw module, which is mounted on the frame.

[0038] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the unloading trolley includes two first linear guide rails that are parallel and spaced apart along the length of the frame. Unloading connecting plates are connected to each first linear guide rail via slider groups, and a gantry frame is connected between the two unloading connecting plates.

[0039] Two lifting cylinders are installed vertically at intervals on the gantry frame. A lifting support is connected to the free end of the piston rod of the lifting cylinder, and an adjusting plate is connected to the bottom of the lifting support.

[0040] A bearing seat is connected to the bottom of the adjusting plate, and a linear bearing is horizontally installed inside the bearing seat. A second positioning pin is slidably connected inside the linear bearing.

[0041] Each second positioning pin has one end that corresponds to the inner side of the positioning hole on the corresponding pin positioning block, and the other end is connected to the first horizontal cylinder.

[0042] In the aforementioned gantry-type resistance welding equipment for metal mesh frame processing, the automatic welding device includes a lower welding assembly disposed at the bottom of the frame and an upper welding assembly disposed above the frame and cooperating with the lower welding assembly.

[0043] The lower welding assembly includes two vertical guide seats fixed to the frame and arranged facing each other. A lower welding seat is slidably connected between the two vertical guide seats via a guide rail assembly. An electrode seat is connected to the upper end face of the lower welding seat via a lower insulating plate. An adjustment groove is provided on the electrode seat along its length, and a lower welding electrode is flexibly connected within the adjustment groove. The lower welding electrode is connected to an external power supply. The lower welding seat is connected to a first lifting drive mechanism.

[0044] The upper welding assembly includes a horizontally adjustable support mounted on the frame. Several three-cylinder cylinders, each corresponding to a lower welding electrode, are detachably connected to the horizontally adjustable support. The free end of the piston rod of each three-cylinder cylinder is connected to an upper welding electrode, which corresponds to a lower welding electrode, via an upper insulating gasket. The upper welding electrode is connected to an external power source.

[0045] In the above-mentioned gantry-type resistance welding equipment for metal grid processing, the three-cylinder includes a cylinder base, and a connecting slot that cooperates with the horizontal adjustment support is provided on the side of the cylinder base.

[0046] A driven piston rod is provided in the cylinder base along the height direction, and a welding support plate is connected to the free end of the driven piston rod. The upper insulating gasket is provided on the lower end face of the welding support plate.

[0047] Three independent cylinder units are stacked on the upper end of the cylinder base along the axial direction of the driven piston rod. Each cylinder unit includes a cylinder body and an active piston rod that is slidably connected inside the cylinder body. The active piston rods in each cylinder unit are connected in series with each other and linked with the driven piston rod.

[0048] An elastic compensation structure is installed between the driving piston rod and the driven piston rod at the bottom. The driving piston rod is pressed down to the preset stroke position for welding. When the metal part to be welded is deformed under pressure in a hot-melt state, the driven piston rod adapts and moves downward under the action of the elastic compensation structure. Each cylinder unit is connected to an external compressed air source through pipelines.

[0049] In the aforementioned gantry-type resistance welding equipment for metal space frame processing, the cylinder base on the upper side of the connecting slot is provided with a threaded connecting hole that connects to the connecting slot vertically, and a fastening screw is threaded into the threaded connecting hole.

[0050] The connecting slot is a dovetail groove, and the horizontal adjustment support is a dovetail slider that cooperates with the dovetail groove. A metal pad that cooperates with the fastening screw is provided in the connecting slot.

[0051] When the fastening screws are tightened against the metal pad, the three-cylinder cylinder is fixedly connected to the horizontal adjustment support.

[0052] In the aforementioned gantry-type resistance welding equipment for metal space frame processing, the upper end of the active piston rod is integrally formed with a sealing part and a threaded connection part from bottom to top, and the outer diameters of the active piston rod, the sealing part, and the threaded connection part gradually decrease.

[0053] The lower end of the active piston rod is axially formed with an internally threaded countersunk hole that mates with the threaded connection part.

[0054] The cylinder unit also includes a piston sandwiched between two adjacent active piston rods, and sealing rings are provided between the piston and the cylinder and between the piston and the corresponding sealing part.

[0055] In the aforementioned gantry-type resistance welding equipment for metal space frame processing, a sealing partition plate is provided between two adjacent cylinders, and a sealing groove and a sealing ring are provided between the contact parts of each cylinder and the sealing partition plate.

[0056] The sealing partition plate is provided with airflow channels that connect the upper and lower cylinders, and the airflow channel pipes for intake are connected to an external compressed air source.

[0057] A clearance through hole is provided on the sealing partition plate to cooperate with the driven piston rod, and a dynamic sealing ring is provided in the clearance through hole.

[0058] A sealing end plate is provided at the top of the cylinder block, and an air intake channel is provided on the sealing end plate to conduct air into the upper chamber of the top cylinder block. The air intake channel is connected to an external compressed air source through a pipeline.

[0059] In the aforementioned gantry-type resistance welding equipment for metal space frame processing, the welding trolley includes at least two second linear guide rails that are parallel and spaced apart along the length of the frame, and the two second linear guide rails are respectively located outside the template frame moving trajectory.

[0060] At least two sliders are slidably connected on each of the second linear guides, and welding slides are connected to each slider on the same second linear guide. The welding slides are connected and linked by a linkage arm.

[0061] On the welding slides at both ends, there are second horizontal cylinders that correspond one-to-one with each of the pin positioning blocks. The free end of the piston rod of the second horizontal cylinder is connected to a third positioning pin that mates with each positioning hole. The linkage arm is threadedly connected to a second lead screw module, which is mounted on the frame.

[0062] With the above-mentioned structure, the present invention enables automatic material stacking through an automatic material stacking unit. At the same time, the material return trolley in the material transfer area and the second horizontal drive mechanism cooperate with the first horizontal drive mechanism and the welding trolley to realize dual-route material feeding and discharging, which can avoid the standby time of material stacking and welding and improve work efficiency. Attached Figure Description

[0063] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0064] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention;

[0065] Figure 2 This is a schematic diagram of the automatic material stacking unit of the present invention;

[0066] Figure 3 This is a schematic diagram of the transverse stacking mechanism of the present invention;

[0067] Figure 4 This is a cross-sectional view of the transverse stacking mechanism of the present invention;

[0068] Figure 5 This is a schematic diagram of the material coding module of the present invention;

[0069] Figure 6 This is a schematic diagram of the back structure of the space frame template of the present invention;

[0070] Figure 7 yes Figure 5 Enlarged view of a portion of point A in the middle;

[0071] Figure 8 This is a schematic diagram of the structure of the first horizontal drive mechanism of the present invention;

[0072] Figure 9 This is a schematic diagram of the material unloading trolley of the present invention;

[0073] Figure 10 This is a schematic diagram of the assembly structure of the second horizontal drive mechanism and the welding carriage of the present invention;

[0074] Figure 11 yes Figure 10 A magnified view of a portion of point B in the middle;

[0075] Figure 12 This is a schematic diagram of the automatic welding device of the present invention;

[0076] Figure 13 This is a schematic diagram of the structure of the three-cylinder cylinder of the present invention;

[0077] Figure 14 This is a cross-sectional structural schematic diagram of the three-cylinder cylinder of the present invention;

[0078] Figure 15 This is an exploded structural diagram of the cylinder unit and sealing partition plate of the present invention.

[0079] In the diagram: 1. Frame; 1a. L-shaped guide bar; 1b. Extended guide bar;

[0080] 2. Automatic material stacking unit; 2a. Horizontal guide rail; 2b. Vertical guide rail; 2c. Horizontal material stacking mechanism; 2d. Vertical material stacking mechanism; 2e. Mounting plate; 2f. Connecting rod; 2g. Mounting base; 2h. Material guiding assembly; 2i. Material distribution plate module; 2j. Rotating shaft; 2k. Servo motor; 2l. Positioning baffle; 2m. Material guide plate; 2n. Clearance post; 2o. Material distribution support; 2p. Material distribution plate; 2q. Positioning notch; 2r. Feed gap; 2s. Arc-shaped clearance notch; 2t. Material guiding gap; 2u. Material guiding block; 2v. Polygonal connecting rod; 2w. Discharge gap;

[0081] 3. Material stacking base;

[0082] 4. Material stacking module; 4a. Template frame; 4b. Guide wheel assembly; 4c. Pin positioning block; 4d. Positioning hole; 4e. Template positioning block; 4f. Space frame template; 4g. Insulating support plate; 4h. Positioning groove; 4i. Guide positioning assembly; 4j. High temperature resistant pad; 4k. Positioning component; 4l. Welding clearance groove; 4m. Drive connection plate; 4n. Connection hole;

[0083] 5. First horizontal drive mechanism; 5a. First guide rod; 5b. Linkage slide; 5c. Toggle lever; 5d. Clearance notch; 5e. First pulley module;

[0084] 6. Unloading trolley; 6a. First linear guide rail; 6b. Unloading connecting plate; 6c. Gantry frame; 6d. Lifting cylinder; 6e. Lifting support; 6f. Adjusting plate; 6g. Bearing seat; 6h. Linear bearing; 6i. Second positioning pin; 6j. First horizontal cylinder;

[0085] 7. Second horizontal drive mechanism; 7a. Second guide rod; 7b. Pusher slide; 7c. Positioning cylinder; 7d. First positioning pin; 7e. Elevation sleeve; 7f. Guide positioning plate; 7g. Clearance hole; 7h. First lead screw module;

[0086] 8. Automatic welding device; 8a. Lower welding assembly; 8b. Upper welding assembly; 8c. Vertical guide seat; 8d. Lower welding seat; 8e. Electrode seat; 8f. Adjustment groove; 8g. Lower welding electrode; 8h. First lifting drive mechanism; 8i. Horizontal adjustment support; 8j. Upper insulating pad; 8k. Upper welding electrode;

[0087] 9. Welding trolley; 9a. Second linear guide rail; 9b. Welding slide plate; 9c. Linkage arm; 9d. Second horizontal cylinder; 9e. Third positioning pin; 9f. Second lead screw module;

[0088] 10. Three-cylinder cylinder; 10a. Cylinder base; 10b. Connecting slot; 10c. Driven piston rod; 10d. Welded support plate; 10e. Cylinder block unit; 10f. Cylinder block; 10g. Driven piston rod; 10h. Fastening screw; 10i. Metal pad; 10j. Sealing part; 10k. Threaded connection part; 10l. Internal thread countersunk hole; 10m. Piston; 10n. Sealing partition plate; 10o. Airflow passage; 10p. Sealing end plate; 10q. Intake passage. Detailed Implementation

[0089] See Figure 1 As shown, a gantry-type resistance welding equipment for metal mesh frame processing according to the present invention includes a frame 1, wherein the frame 1 is provided with a material stacking area, a material feeding and discharging transfer area and a welding area in sequence along the length direction.

[0090] The material stacking area includes an automatic material stacking unit 2, a material stacking base 3 is provided within the travel range of the automatic material stacking unit 2, and a material stacking module 4 is slidably disposed on the material stacking base 3. A first horizontal drive mechanism 5 is provided on the frame 1 to drive the material stacking module 4 to move to the material inlet / outlet transfer area.

[0091] The material handling transfer area includes a material return trolley 6 mounted on the frame 1 and connected to the material stacking area, and a second horizontal drive mechanism 7 mounted on the frame 1 and connected to the first horizontal drive mechanism 5 and the welding area.

[0092] The welding area includes an automatic welding device 8 mounted on the frame 1 and a welding carriage 9 that cooperates with the second horizontal drive mechanism 7.

[0093] When the welding carriage 9 returns from the welding area to the material transfer area, the unloading carriage 6 lifts the stacking module 4 on the welding carriage 9 and waits. When another stacking module 4 in the stacking area is stacked and sent to the material transfer area by the first horizontal drive mechanism 5, the unloading carriage 6 sends the welded stacking module 4 to the stacking area for re-stacking. At the same time, the stacking modules entering the material transfer area are moved to the predetermined position by the second horizontal drive mechanism and then sent into the welding area by the welding carriage.

[0094] Implementing "dual-track operation" in the material loading and unloading transfer area can avoid the waiting time in the material stacking area and welding area, thereby improving efficiency.

[0095] See Figure 2-4 As shown, preferably, the automatic stacking unit 2 includes a transverse guide rail 2a and a longitudinal guide rail 2b disposed on the frame 1. A transverse stacking mechanism 2c is disposed on the transverse guide rail 2a, and a longitudinal stacking mechanism 2d is disposed on the longitudinal guide rail 2b. The transverse stacking mechanism 2c and the longitudinal stacking mechanism 2d have the same structure.

[0096] Specifically, the transverse stacking mechanism 2c includes a mounting plate 2e slidably connected to a transverse guide rail 2a, and a horizontal drive mechanism is connected to the mounting plate 2e. Connecting rods 2f are provided between the mounting plates 2e, and several mounting seats 2g that can be adjusted along the connecting rods 2f are connected between each connecting rod 2f. A material guiding assembly 2h is inclinedly arranged on the mounting seat 2g.

[0097] A material distribution plate module 2i is provided on the side of each mounting base 2g. The material distribution plate modules 2i are connected in series via a rotating shaft 2j, one end of which is connected to a servo motor 2k. The external wires to be welded on the material guiding assembly 2h are separated one by one by the material distribution plate modules 2i and sent to the material stacking module 4 in the material stacking area.

[0098] More preferably, the material guiding assembly 2h includes positioning baffles 2l symmetrically arranged on the mounting seats 2g at both ends, and inclined material guiding plates 2m are provided on the inner side of each positioning baffle 2l, and each material guiding plate 2m is movably inserted through each connecting rod 2f.

[0099] Each positioning baffle 2l is provided with a clearance post 2n between it and the corresponding mounting base 2g and guide plate 2m. External welding wires are mounted on each guide plate 2m.

[0100] It should be noted that, regardless of whether it is a horizontal or vertical stacking mechanism, the mounting base can be adapted to different arrangements of the horizontal and vertical wires in the space frame. For example, in this embodiment, the vertical stacking mechanism has three mounting bases, with the middle mounting base serving as a separator. Correspondingly, its material guiding assembly has two guide plates, located on both sides of the positioning baffle. Such variations are easily conceived by those skilled in the art based on specific needs.

[0101] More preferably, the radial cross-section of the rotating shaft 2j is polygonal. The material distribution plate module 2i includes a material distribution support 2o fixedly connected to the rotating shaft 2j, and a material distribution plate 2p detachably connected to the material distribution support 2o. Positioning notches 2q, adapted to the outer diameter of the wire to be welded, are evenly distributed along the edge of the material distribution plate 2p. The polygonal rotating shaft ensures the consistency of each material distribution plate, ensuring that the corresponding positioning notches are on the same straight line, facilitating wire entry.

[0102] The mounting base 2g is positioned opposite to the guide plate 2m to form a feeding gap 2r. The distributing plate 2p is located below the feeding gap 2r. An arc-shaped clearance notch 2s is provided on the mounting base 2g at the lower end of the feeding gap 2r to cooperate with the distributing plate 2p. The arc-shaped clearance notch 2s cooperates with the distributing plate 2p to form a guiding gap 2t.

[0103] A guide block 2u is provided on the side of the feeding tray 2p. The guide block 2u is connected to the mounting plate 2e via a polygonal connecting rod 2v. The guide block 2u and the mounting base 2g cooperate to form a discharge gap 2w. The upper end of the discharge gap 2w is connected to the outlet end of the guide gap 2t. Each wire to be welded passes through the feeding gap 2r, the guide gap 2t, and the discharge gap 2w in sequence before being output.

[0104] Based on the aforementioned fit of the gaps, those skilled in the art can make adaptive changes, all of which should fall within the scope of protection of this invention. For example, the discharge gap can be achieved through other fitting methods. Furthermore, the gaps and discharge methods can be adaptively varied according to the different requirements of the wire.

[0105] See Figure 5-7 As shown, preferably, the material stacking module 4 includes a template frame 4a, and guide wheel assemblies 4b are provided at the bottom of the template frame 4a and on both sides along the length of the frame 1. A plurality of pin positioning blocks 4c are provided on the upper surface of both sides of the template frame 4a along the length of the frame 1, and positioning holes 4d are provided on the pin positioning blocks 4c. The purpose of the positioning holes is to facilitate the lifting and movement of the entire material stacking module by external pin components, etc. Based on this purpose, designing the pin positioning blocks as hooks can also achieve the same result; this is an equivalent alternative solution that is easily conceived by those skilled in the art. In this embodiment, to facilitate the entry of the pins, both ends of the positioning holes are flared openings.

[0106] At least two template positioning blocks 4e are mounted on the template frame 4a, and a space frame template 4f is fixed between the two template positioning blocks 4e. In this embodiment, the space frame template 4f includes an insulating support plate 4g, on which several transverse positioning modules for positioning transverse wires to be welded and several longitudinal positioning modules for positioning longitudinal wires to be welded are distributed at intervals along the transverse direction.

[0107] Specifically, the lateral positioning module consists of a positioning groove 4h set on the upper surface of the insulating support plate 4g and guide positioning components 4i respectively set at both ends of the positioning groove 4h. The purpose of the guide positioning components is to fix the lateral wire and to assist in guiding the wire output by the automatic feeding unit, thereby ensuring that the wire falls accurately into the corresponding positioning groove without deviation. In this embodiment, the guide positioning component consists of a guide positioning block located at the inner end of the positioning groove and a guide comb tooth set vertically to the positioning groove and located near the end of the positioning groove along its length. The guide comb tooth has matching guide teeth distributed according to the width of the positioning groove. The upper end of each guide tooth is an isosceles triangle. With this structure, the guide teeth on both sides can cooperate to form a flared mouth, which can return the deviated wire to the correct position.

[0108] The longitudinal positioning module includes several high-temperature resistant pads 4j on the upper surface of the insulating support plate 4g on the side of the positioning groove 4h. Each high-temperature resistant pad 4j is arranged in pairs facing each other to form a positioning gap adapted to the outer diameter of the wire to be welded.

[0109] Positioning elements 4k are respectively provided at both ends of the insulating support plate 4g corresponding to the longitudinal wire to be welded, and at least one of the positioning elements 4k is an elastic positioning element. When the longitudinal wire to be welded is heated and elongated, the elastic positioning element adaptably retracts while clamping. In this embodiment, the elastic positioning element consists of a mounting base, a positioning pin block movably disposed in the mounting base and in contact with the wire, and a spring connecting the positioning pin block and the mounting base. When the wire is heated and extended under pressure, the positioning pin block can adaptably retract, positioning the wire while ensuring that it does not shift, bend, or deform. Of course, based on the above concept, those skilled in the art can use other conventional elastic positioning structures. In order to achieve automatic feeding, the ends of the positioning pin block and the guide positioning component are designed with inclination to facilitate guiding the wire to fall in automatically.

[0110] A welding clearance groove 4l is provided on the back of the insulating support plate 4g corresponding to the longitudinal wire to be welded, which conducts through each positioning groove 4h. During welding, the lower electrode of the welding device enters from the welding clearance groove and contacts each wire to perform welding.

[0111] See Figure 2 and Figure 8 As shown, in this embodiment, preferably, the first horizontal drive mechanism 5 includes first guide rods 5a that are parallel to and spaced apart along the length of the frame 1, and a linkage slide block 5b is connected between the guide rods 5a.

[0112] At least two spaced levers 5c are connected to the linkage slide 5b, and clearance notches 5d corresponding to each lever 5c are provided on the material stacking base 3. The center line connecting the two levers is parallel to the guide rod, ensuring that they can contact the template frame simultaneously and preventing offset during the tossing process.

[0113] The linkage slide block 5b is connected to the first pulley module 5e, which is parallel to the first guide rod 5a and is mounted on the frame 1.

[0114] When the material stacking is completed, the controller starts the first pulley module, and the lever pushes the material stacking module into the material transfer area.

[0115] See Figure 9 As shown, preferably, the unloading trolley 6 includes two first linear guide rails 6a that are parallel and spaced apart along the length of the frame 1. Unloading connecting plates 6b are connected to each first linear guide rail 6a by a slider group, and a gantry frame 6c is connected between the two unloading connecting plates 6b.

[0116] Two lifting cylinders 6d are vertically spaced on the gantry frame 6c. A lifting support 6e is connected to the free end of the piston rod of the lifting cylinder 6d, and an adjusting plate 6f is connected to the bottom of the lifting support 6e.

[0117] A bearing seat 6g is connected to the bottom of the adjusting plate 6f. A linear bearing 6h is horizontally arranged inside the bearing seat 6g. A second positioning pin 6i is slidably connected inside the linear bearing 6h.

[0118] Each second positioning pin 6i has one end that corresponds to the inner side of the positioning hole 4d on the corresponding pin positioning block 4c, and the other end is connected to the first horizontal cylinder 6j.

[0119] The function of the unloading trolley is to turn the original one infeed and outfeed path into two. Through the lifting cylinder, the stacking module that exits from the welding area is lifted up to make way for the stacking module in the stacking area to enter the welding area. When the stacking module in the stacking area moves toward the welding area, the unloading trolley will exit the stacking module with the welded mesh frame inside into the stacking area for unloading and re-stacking.

[0120] See Figure 1 , Figure 10 and Figure 11 As shown, preferably, L-shaped guide bars 1a are symmetrically arranged on the frame 1 in the material transfer area, corresponding to the template frame 4a of the material stacking module 4 in the material stacking area. The two L-shaped guide bars 1a cooperate to form a guide groove for the template frame 4a to slide.

[0121] An extension guide strip 1b is connected to one end of the two L-shaped guide strips 1a facing the stacking area. The end of the extension guide strip 1b facing the stacking area is in the shape of a figure eight.

[0122] When the space frame template 4f located in the material stacking area is in the material stacking state, the end of the template frame 4a facing the material transfer area is located inside the extended guide strip 1b.

[0123] The second horizontal drive mechanism 7 is mounted on the frame 1 between two L-shaped guide bars 1a. The second horizontal drive mechanism 7 includes second guide rods 7a that are parallel to and spaced apart along the length of the frame 1, and a pusher slide block 7b is slidably connected between the two second guide rods 7a.

[0124] Two positioning cylinders 7c are arranged vertically at intervals on the pusher slide 7b, and a first positioning pin 7d is connected to the free end of the piston rod of each positioning cylinder 7c.

[0125] Above the pusher slide 7b, a guide positioning plate 7f is connected via a shim sleeve 7e, which mates with each of the first positioning pins 7d. The guide positioning plate 7f has clearance holes 7g that mate with the first positioning pins 7d. A drive connecting plate 4m is fixed to the edge of the template frame 4a, and the drive connecting plate 4m has connecting holes 4n corresponding to the two first positioning pins 7d. The main function of the guide positioning plate is to position the first positioning pins so that they move stably up and down. Simultaneously, during the operation of the second horizontal drive mechanism, it helps the first positioning pins counteract the influence of the material stacking module on the positioning cylinder, thus preventing the radial force on the first positioning pins from being transmitted to the positioning cylinder when the material stacking module is moved.

[0126] The pusher slide 7b is threadedly connected to a first lead screw module 7h, which is mounted on the frame 1.

[0127] See Figure 12 As shown, preferably, the automatic welding device 8 includes a lower welding assembly 8a disposed at the lower part of the frame 1 and an upper welding assembly 8b disposed above the frame 1 and cooperating with the lower welding assembly 8a.

[0128] The lower welding assembly 8a includes two vertical guide seats 8c fixed on the frame 1 and arranged facing each other. A lower welding seat 8d is slidably connected between the two vertical guide seats 8c via a guide rail assembly. An electrode seat 8e is connected to the upper end face of the lower welding seat 8d via a lower insulating plate. An adjustment groove 8f is provided on the electrode seat 8e along its length. A lower welding electrode 8g is tunably connected within the adjustment groove 8f and is connected to an external power source. The lower welding seat 8d is connected to a first lifting drive mechanism 8h.

[0129] The upper welding assembly 8b includes a horizontally adjustable support 8i horizontally mounted on the frame 1. Several three-cylinder cylinders 10, each corresponding to a lower welding electrode 8g, are detachably connected to the horizontally adjustable support 8i. The free end of the piston rod of each three-cylinder cylinder 10 is connected to an upper welding electrode 8k, which corresponds to a lower welding electrode 8g, via an upper insulating gasket 8j. The upper welding electrode 8k is connected to an external power source.

[0130] The unique three-cylinder design provides greater downward pressure for welding, resulting in better resistance welding. Hydraulic cylinders are not used in the automatic welding device because of their slow extension and retraction speed, and also because of the risk of oil leakage, which poses a safety hazard to workers in a high-pressure environment.

[0131] See Figure 13-15 As shown, preferably, the three-cylinder cylinder 10 includes a cylinder base 10a, and a connecting slot 10b that cooperates with the horizontal adjustment support 8i is provided on the side of the cylinder base 10a.

[0132] A driven piston rod 10c is provided in the cylinder base 10a along the height direction. A welding support plate 10d is connected to the free end of the driven piston rod 10c. The upper insulating gasket 8j is provided on the lower end face of the welding support plate 10d.

[0133] Three independent cylinder units 10e are stacked on the upper end of the cylinder base 10a along the axial direction of the driven piston rod 10c. Each cylinder unit 10e includes a cylinder body 10f and an active piston rod 10g that is slidably connected in the cylinder body 10f. The active piston rods 10g in each cylinder unit 10e are connected in series with each other and linked with the driven piston rod 10c.

[0134] An elastic compensation structure is provided between the lowest active piston rod 10g and the driven piston rod 10c. The active piston rod 10g is pressed down to the preset stroke for welding. When the metal part to be welded is deformed under pressure in a hot-melt state, the driven piston rod 10c adaptably moves downward under the action of the elastic compensation structure. Each cylinder unit 10e is connected to an external compressed air source through pipelines.

[0135] More preferably, to facilitate the fixing of the three-cylinder cylinder, a threaded connection hole for conducting the connection slot 10b is provided vertically on the cylinder base 10a on the upper side of the connection slot 10b, and a fastening screw 10h is threadedly connected in the threaded connection hole.

[0136] The connecting slot 10b is a dovetail groove, and the horizontal adjustment support 8i is a dovetail slider that mates with the dovetail groove. A metal pad 10i that mates with the fastening screw 10h is provided inside the connecting slot 10b. The metal pad can prevent damage to the connecting slot and improve its service life.

[0137] When the fastening screw 10h tightens the metal pad 10i, the three-cylinder cylinder 10 is fixedly connected to the horizontal adjustment support 8i.

[0138] More preferably, the upper end of the active piston rod 10g is integrally formed with a sealing part 10j and a threaded connection part 10k from bottom to top, and the outer diameters of the active piston rod 10g, the sealing part 10j and the threaded connection part 10k gradually decrease.

[0139] The lower end of the active piston rod 10g is axially formed with an internal thread countersunk hole 10l that mates with the threaded connection part 10k.

[0140] The cylinder unit 10e also includes a piston 10m sandwiched between two adjacent active piston rods 10g. A sealing ring is provided between the piston 10m and the cylinder 10f, and between the piston and the corresponding sealing part 10j.

[0141] By cleverly utilizing the cooperation of two adjacent active piston rods, both the piston section is sealed and the piston is firmly fixed, thus improving assembly efficiency.

[0142] More preferably, in this embodiment, a sealing partition plate 10n is provided between two adjacent cylinders 10f, and a sealing groove and a sealing ring are provided between the contact parts of each cylinder 10f and the sealing partition plate 10n.

[0143] An airflow channel 10o is provided on the sealing partition plate 10n to conduct airflow between the upper and lower cylinders 10f. The airflow channel 10o for air intake is connected to an external compressed air source. In this embodiment, the airflow channel for air exhaust is connected to an external area that requires compressed air, such as for purging.

[0144] A clearance through hole is provided on the sealing partition plate 10n to cooperate with the driven piston rod 10c, and a dynamic sealing ring is provided in the clearance through hole.

[0145] A sealing end plate 10p is provided on the upper end of the cylinder 10f at the top. An air intake passage 10q is provided on the sealing end plate 10p to conduct air into the upper chamber of the uppermost cylinder 10f. The air intake passage 10q is connected to an external compressed air source through a pipeline.

[0146] See Figure 10 As shown, preferably, the welding trolley 9 includes at least two second linear guide rails 9a that are parallel and spaced apart along the length of the frame 1, and the two second linear guide rails 9a are respectively located outside the moving trajectory of the template frame 4a.

[0147] At least two sliders are slidably connected on each of the second linear guide rails 9a, and welding slide plates 9b are connected to each slider on the same second linear guide rail 9a. Each welding slide plate 9b is connected and linked by a linkage arm 9c.

[0148] On the welding slide plates 9b located at both ends, there are second horizontal cylinders 9d that are opposite to each of the pin positioning blocks 4c. The free end of the piston rod of the second horizontal cylinder 9d is connected to a third positioning pin 9e that mates with the positioning hole 4d. The linkage arm 9c is threadedly connected to a second lead screw module 9f, which is mounted on the frame 1.

[0149] It should be noted that the lead screw modules used in this invention are all conventional structures in the art and will not be described in detail here. Meanwhile, the strokes of each trolley and horizontal drive mechanism are controlled by sensors or sensors integrated into the cylinders. The sensors and drive mechanisms are connected to the controller to achieve automation. These are all common knowledge in the art and are not technical points to be protected in this invention.

[0150] During operation, the automatic material stacking unit stacks the space frame templates in the stacking area. After stacking is complete, the controller activates the first pulley module, and the lever pushes the stacking module into the infeed / outfeed transfer area, stopping when the first positioning pin aligns with the connecting hole. At this point, the positioning cylinder moves upward to insert the first positioning pin into the connecting hole, and the first lead screw module activates to continue pushing the stacking module towards the welding area, stopping after reaching the predetermined position. Simultaneously, the welding carriage starts, sending the stacking module into the welding area for welding.

[0151] After welding is completed, the welding trolley moves the material stacking module back to its predetermined position and resets. At this time, the unloading trolley lifts the material stacking module of the welded grid frame and puts it into standby mode. When another material stacking module in the material stacking area completes its stacking and starts the first pulley module, the unloading trolley also starts at the same time to send the welded material stacking module back to the material stacking area for workers to unload. The above steps are repeated to achieve continuous welding.

[0152] The above-described embodiments are preferred embodiments of the present invention and are only used to facilitate the illustration of the present invention. They are not intended to limit the present invention in any way. Any person skilled in the art who makes local modifications or alterations to the technical content disclosed in the present invention without departing from the scope of the technical features of the present invention shall still fall within the scope of the technical features of the present invention.

Claims

1. A portal-type resistance welding apparatus for metal grid processing, comprising a frame (1), characterized in that, The rack (1) is sequentially provided with a material stacking area, a material feeding and discharging transfer area and a welding area along the length direction; The material stacking area comprises an automatic material stacking unit (2), a material stacking base (3) is arranged in the stroke coverage range of the automatic material stacking unit (2), and a material stacking module (4) is slidably arranged on the material stacking base (3); a first horizontal driving mechanism (5) is arranged on the rack (1) to drive the material stacking module (4) to move to the material feeding and discharging transfer area; The material feeding and discharging transfer area comprises a material discharging trolley (6) arranged on the rack (1) and connected to the material stacking area, and a second horizontal driving mechanism (7) arranged on the rack (1) and connecting the first horizontal driving mechanism (5) and the welding area; The welding area comprises an automatic welding device (8) arranged on the rack (1) and a welding trolley (9) matched with the second horizontal driving mechanism (7); When the welding trolley (9) returns from the welding area to the material feeding and discharging transfer area, the material discharging trolley (6) lifts the material stacking module (4) on the welding trolley (9) and waits; when another material stacking module (4) in the material stacking area is stacked and sent to the material feeding and discharging transfer area by the first horizontal driving mechanism (5), the material discharging trolley (6) sends the completed material stacking module (4) to the material stacking area for restacking.

2. The portal type resistance welding apparatus for processing a metal grid according to claim 1, wherein The automatic material stacking unit (2) comprises a transverse guide rail (2a) and a longitudinal guide rail (2b) arranged on the rack (1), a transverse material stacking mechanism (2c) is arranged on the transverse guide rail (2a), and a longitudinal material stacking mechanism (2d) is arranged on the longitudinal guide rail (2b), and the transverse material stacking mechanism (2c) and the longitudinal material stacking mechanism (2d) are the same in structure; The transverse material stacking mechanism (2c) comprises a mounting plate (2e) slidably connected to the transverse guide rail (2a), and a horizontal driving mechanism is connected to the mounting plate (2e); a connecting rod (2f) is arranged between the mounting plates (2e), a plurality of mounting seats (2g) capable of adjusting positions along the connecting rod (2f) are connected between the connecting rods (2f), and a material guiding assembly (2h) is obliquely arranged on the mounting seat (2g); A material distribution disc module (2i) is arranged on the side of each mounting seat (2g), each material distribution disc module (2i) is connected in series through a rotating shaft (2j), one end of the rotating shaft (2j) is connected with a servo motor (2k), and an external wire to be welded located on the material guiding assembly (2h) is separated and sent to the material stacking module (4) in the material stacking area through the material distribution disc module (2i).

3. The portal type electric resistance welding apparatus for processing a metal grid according to claim 2, wherein The material guiding assembly (2h) comprises positioning baffles (2l) symmetrically arranged on the two end mounting seats (2g), an obliquely arranged material guiding plate (2m) is arranged on the inner side of each positioning baffle (2l), and each material guiding plate (2m) is movably arranged on each connecting rod (2f); A gap column (2n) is arranged between the positioning baffle (2l) and the corresponding mounting seat (2g) and material guiding plate (2m); and external welding wire racks are arranged on each material guiding plate (2m).

4. The portal type electric resistance welding apparatus for processing a metal grid according to claim 3, wherein The radial section of the rotating shaft (2j) is polygonal; the distributing disc module (2i) comprises a distributing disc support (2o) fixedly connected with the rotating shaft (2j), and a distributing disc (2p) is detachably connected on the distributing disc support (2o); and the edge of the distributing disc (2p) is uniformly provided with positioning notches (2q) adapted to the outer diameter of the wire to be welded; The mounting seat (2g) is oppositely arranged with the material guide plate (2m) and forms a feeding gap (2r), the distributing disc (2p) is located on the lower side of the feeding gap (2r), and the mounting seat (2g) at the lower end of the feeding gap (2r) is provided with an arc-shaped accommodation notch (2s) matched with the distributing disc (2p), and the arc-shaped accommodation notch (2s) and the distributing disc (2p) cooperatively form a material guiding gap (2t); A material guiding block (2u) is arranged on the side edge of the distributing disc (2p), the material guiding block (2u) is connected with the mounting plate (2e) through a polygonal connecting rod (2v), the material guiding block (2u) cooperatively forms a discharging gap (2w) with the mounting seat (2g), the upper end of the discharging gap (2w) is connected with the outlet end of the material guiding gap (2t), and the wire to be welded is sequentially output through the feeding gap (2r), the material guiding gap (2t) and the discharging gap (2w).

5. The portal type electric resistance welding apparatus for metal grid processing according to claim 1, wherein The code material module (4) comprises a template frame (4a), and guide wheel sets (4b) are arranged on the bottom of the template frame (4a) and on both sides of the template frame (4a) along the length direction of the rack (1); a plurality of pin positioning blocks (4c) are arranged on the upper surfaces of the two sides of the template frame (4a) along the length direction of the rack (1), and positioning holes (4d) are arranged on the pin positioning blocks (4c); At least two template positioning blocks (4e) are arranged on the template frame (4a), and a net rack template (4f) is fixedly arranged between the two template positioning blocks (4e); The net rack template (4f) comprises insulating support plates (4g), a plurality of horizontal positioning modules for positioning horizontal wires to be welded and a plurality of vertical positioning modules for positioning vertical wires to be welded are arranged on the upper surfaces of the insulating support plates (4g) and are spaced apart along the horizontal direction and the vertical direction, respectively; The horizontal positioning module is composed of positioning grooves (4h) arranged on the upper surfaces of the insulating support plates (4g) and guide positioning assemblies (4i) arranged at both ends of the positioning grooves (4h), respectively; The vertical positioning module comprises a plurality of high-temperature-resistant pads (4j) arranged on the upper surfaces of the insulating support plates (4g) on the side edges of the positioning grooves (4h), and the high-temperature-resistant pads (4j) are arranged in pairs to form positioning gaps adapted to the outer diameter of the wires to be welded; Positioning members (4k) are arranged at both ends of the insulating support plates (4g) corresponding to the vertical wires to be welded, and at least one of the positioning members (4k) is an elastic positioning member; when the vertical wire to be welded is heated and elongated, the elastic positioning member is clamped while being adapted to retreat; Welding retreat grooves (4l) are arranged on the back surfaces of the insulating support plates (4g) corresponding to the vertical wires to be welded and pass through the positioning grooves (4h).

6. The portal type electric resistance welding apparatus for processing a metal grid according to claim 5, wherein The first horizontal driving mechanism (5) comprises first guide rods (5a) arranged in parallel and spaced apart along the length direction of the rack (1), and a linkage sliding seat (5b) is connected between the first guide rods (5a); At least two interval arranged push rods (5c) are connected on the linkage slide (5b), and a corresponding gap (5d) is arranged on the material stacking base (3) corresponding to each push rod (5c); The linkage slide (5b) is connected with a parallel first guide rod (5a) and a first belt pulley module (5e) arranged on the rack (1).

7. The portal type electric resistance welding apparatus for processing a metal grid according to claim 5, wherein The rack (1) in the feeding and discharging transfer area is symmetrically provided with an L-shaped guide strip (1a) corresponding to the template frame (4a) of the material stacking module (4) in the material stacking area, and the two L-shaped guide strips (1a) cooperate to form a guide groove for the template frame (4a) to slide; An extension guide strip (1b) is connected at one end of the two L-shaped guide strips (1a) facing the material stacking area, and one end of the extension guide strip (1b) facing the material stacking area is in an eight-character shape; When the grid frame template (4f) located in the material stacking area is in the material stacking state, one end of the template frame (4a) facing the feeding and discharging transfer area is located in the extension guide strip (1b); The second horizontal driving mechanism (7) is arranged on the rack (1) between the two L-shaped guide strips (1a), and the second horizontal driving mechanism (7) includes a second guide rod (7a) arranged in parallel and at intervals along the length direction of the rack (1), and a pushing slide (7b) is slidably connected between the two second guide rods (7a); Two positioning cylinders (7c) are vertically and interval arranged on the pushing slide (7b), and a first positioning pin (7d) is connected at the free end of the piston rod of each positioning cylinder (7c); A guide positioning plate (7f) matched with each first positioning pin (7d) is connected above the pushing slide (7b) through a heightening sleeve (7e), and a gap (7g) matched with the first positioning pin (7d) is arranged on the guide positioning plate (7f); A driving connecting plate (4m) is fixed at the edge of the template frame (4a), and a connecting hole (4n) corresponding to the two first positioning pins (7d) is arranged on the driving connecting plate (4m); The pushing slide (7b) is threadedly connected with a first lead screw module (7h), and the first lead screw module (7h) is arranged on the rack (1).

8. The portal type electric resistance welding apparatus for processing a metal grid according to claim 5, wherein The material returning trolley (6) includes two first linear guide rails (6a) arranged in parallel and at intervals along the length direction of the rack (1), a material returning connecting plate (6b) is connected to each first linear guide rail (6a) through a sliding block group, and a portal frame (6c) is connected between the two material returning connecting plates (6b); Two lifting cylinders (6d) are vertically and interval arranged on the portal frame (6c), a lifting support (6e) is connected at the free end of the piston rod of the lifting cylinder (6d), and an adjusting plate (6f) is connected at the bottom of the lifting support (6e); A bearing seat (6g) is connected at the bottom of the adjusting plate (6f), a linear bearing (6h) is horizontally arranged in the bearing seat (6g), and a second positioning pin (6i) is slidably connected in the linear bearing (6h); One end of each second positioning pin (6i) corresponds to the inside of the positioning hole (4d) on the corresponding pin positioning block (4c), and the other end is connected with a first horizontal cylinder (6j).

9. The portal type electric resistance welding apparatus for processing a metal grid according to claim 1, wherein The automatic welding device (8) comprises a lower welding assembly (8a) arranged at the lower part of the frame (1) and an upper welding assembly (8b) arranged above the frame (1) and matched with the lower welding assembly (8a); The lower welding assembly (8a) comprises two vertical guide bases (8c) fixed on the frame (1) and arranged oppositely, a lower welding base (8d) slidably connected between the two vertical guide bases (8c) through a guide rail assembly, an electrode base (8e) connected to the upper end surface of the lower welding base (8d) through a lower insulation plate, an adjusting groove (8f) arranged on the electrode base (8e) along the length direction, a lower welding electrode (8g) adjustably connected in the adjusting groove (8f), and the lower welding electrode (8g) connected with an external power source; the lower welding base (8d) is connected with a first lifting driving mechanism (8h); The upper welding assembly (8b) comprises a horizontal adjusting support (8i) horizontally arranged on the frame (1), a plurality of three-cylinder air cylinders (10) corresponding to the lower welding electrodes (8g) one by one and detachably connected to the horizontal adjusting support (8i), an upper welding electrode (8k) corresponding to the lower welding electrode (8g) one by one and matched with the three-cylinder air cylinder (10) and connected to the free end of the piston rod of the three-cylinder air cylinder (10) through an upper insulation pad (8j), and the upper welding electrode (8k) connected with an external power source.

10. The portal type electric resistance welding apparatus for processing a metal grid according to claim 9, wherein The three-cylinder air cylinder (10) comprises a cylinder base (10a), and a connecting clamping groove (10b) matched with the horizontal adjusting support (8i) is arranged on the side of the cylinder base (10a); A driven piston rod (10c) is arranged in the cylinder base (10a) along the height direction, a welding support plate (10d) is connected to the free end of the driven piston rod (10c), and the upper insulation pad (8j) is arranged on the lower end surface of the welding support plate (10d); Three independent cylinder units (10e) are arranged on the upper end of the cylinder base (10a) along the axial direction of the driven piston rod (10c) in a stacked manner, each cylinder unit (10e) comprises a cylinder body (10f) and a driving piston rod (10g) slidably connected in the cylinder body (10f), and the driving piston rods (10g) in each cylinder unit (10e) are connected in series with each other and with the driven piston rod (10c); An elastic compensation structure is arranged between the driving piston rod (10g) at the lowermost end and the driven piston rod (10c), the driving piston rod (10g) is pressed to a position for welding according to a preset stroke, and when the metal piece to be welded is deformed under pressure in a hot melting state, the driven piston rod (10c) is adaptively moved downward under the action of the elastic compensation structure; and each cylinder unit (10e) is connected to an external compressed air source through a pipeline.

11. The portal type electric resistance welding apparatus for processing a metal grid according to claim 10, wherein A threaded connection hole passing through the connecting clamping groove (10b) is arranged on the cylinder base (10a) on the upper side of the connecting clamping groove (10b), and a fastening screw (10h) is threadedly connected in the threaded connection hole; The connecting clamping groove (10b) is a dovetail groove, the horizontal adjusting support (8i) is a dovetail sliding block matched with the dovetail groove, and a metal pad (10i) matched with the fastening screw (10h) is arranged in the connecting clamping groove (10b); and The connecting clamping groove (10b) is a dovetail groove, the horizontal adjusting support (8i) is a dovetail sliding block matched with the dovetail groove, and a metal pad (10i) matched with the fastening screw (10h) is arranged in the connecting clamping groove (10b). When the fastening screw (10h) is tightened against the metal pad (10i), the three-cylinder cylinder (10) is fixedly connected with the horizontal adjusting support (8i).

12. The portal type electric resistance welding apparatus for processing a metal grid according to claim 10, wherein The outer diameter of the driving piston rod (10g), the sealing part (10j) and the threaded connection part (10k) gradually decreases from bottom to top; The lower end of the driving piston rod (10g) is formed with an inner threaded hole (10l) matched with the threaded connection part (10k) in the axial direction; The cylinder unit (10e) further comprises a piston (10m) clamped between two adjacent driving piston rods (10g), and a sealing ring is arranged between the piston (10m) and the cylinder (10f) and between the piston and the corresponding sealing part (10j).

13. The portal type electric resistance welding apparatus for processing a metal grid according to claim 11 or 12, wherein A sealing partition plate (10n) is arranged between the two adjacent cylinders (10f), and a sealing groove and a sealing rubber ring are arranged between the contact parts of each cylinder (10f) and the sealing partition plate (10n) to cooperate with each other; Air flow channels (10o) for conducting air flow of the upper and lower cylinders (10f) are arranged on the sealing partition plate (10n), and the air flow channels (10o) for air inlet are connected with an external compressed air source through pipelines; A clearance hole matched with the driven piston rod (10c) is arranged on the sealing partition plate (10n), and a dynamic sealing rubber ring is arranged in the clearance hole; A sealing end plate (10p) is arranged on the upper end of the uppermost cylinder (10f), and an air inlet channel (10q) for conducting the upper chamber of the uppermost cylinder (10f) is arranged on the sealing end plate (10p), and the air inlet channel (10q) is connected with an external compressed air source through a pipeline.

14. The portal type electric resistance welding apparatus for processing a metal grid according to claim 5, wherein The welding trolley (9) comprises at least two second linear guides (9a) arranged in parallel and at intervals along the length direction of the rack (1), and the two second linear guides (9a) are respectively located on the outer sides of the moving track of the template frame (4a); At least two sliding blocks are connected on each second linear guide (9a), and a welding sliding plate (9b) is connected on each sliding block of the same second linear guide (9a), and each welding sliding plate (9b) is connected through a linkage arm (9c); Second horizontal cylinders (9d) are arranged on the welding sliding plates (9b) at both ends in pairs and correspond to the plug positioning blocks (4c) one by one, and the free ends of the piston rods of the second horizontal cylinders (9d) are connected with third positioning plugs (9e) matched with the positioning holes (4d) one by one; the linkage arm (9c) is threadedly connected with a second screw rod module (9f), and the second screw rod module (9f) is arranged on the rack (1).

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