A steel bar truss head electric resistance welding machine

Abstract

The application discloses a steel bar truss head resistance welding machine and relates to the technical field of automatic welding equipment. The steel bar truss head resistance welding machine comprises a rack, a steel bar feeding mechanism arranged above the rack, a vertical bar feeding mechanism arranged beside the rack, a horizontal bar feeding mechanism, a welding cross mechanism arranged in the middle of the rack, a lower chord welding mechanism, a steel bar truss positioning mechanism, an upper chord welding mechanism arranged at one end of the rack and a steel bar truss feeding manipulator. The application combines the automatic welding structure with the discharge welding method, reduces the land occupation area of manual work and further reduces the cost. Meanwhile, the resistance welding method is used, the welding rod is not needed, the cost is reduced, the product is beautiful, the welding firmness is reliable, the defective products do not appear, the occupational diseases possibly caused by long-term electric welding work of workers are eliminated, the workshop environment is improved, the electric welding light pollution and air pollution in the workshop are completely eliminated and the modern clean production process requirements can be better implemented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic welding equipment, and particularly relates to a steel bar truss end cap resistance welding machine. BACKGROUND

[0002] In the production process of a steel bar truss, a horizontal steel bar (referred to as a horizontal bar) and a vertical steel bar (referred to as a vertical bar) are welded at one end of the steel bar truss for end cap processing. The current operation of this process is performed manually. Manual welding is not only slow, but also consumes a large number of welding rods, has high cost, and the appearance of the welded product is not beautiful. In addition, the firmness of the welding points cannot be guaranteed, and the smoke and arc light generated during welding have a great impact on the workshop environment. SUMMARY

[0003] The present application relates to the technical field of automatic welding equipment, and particularly relates to a steel bar truss end cap resistance welding machine.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A steel bar truss end cap resistance welding machine, comprising a rack, further comprising: a steel bar feeding mechanism arranged above the rack, a vertical bar feeding mechanism arranged beside the rack, a horizontal bar feeding mechanism, a welding cross mechanism arranged in the middle of the rack, a lower chord welding mechanism, a steel bar truss positioning mechanism, an upper chord welding mechanism arranged at one end of the rack, and a steel bar truss feeding manipulator.

[0006] Further, the rack comprises a workbench, a transverse positioning adjusting plate, a foot wheel, a transformer, a worm gear reducer, a driving shaft, an electrical box rack, a ground rail and a connecting copper strip, and the steel bar truss is a product to be processed;

[0007] The steel bar feeding mechanism comprises a mounting foot, an X-axis linear module composed of a cross beam plate, a slide rail and a slide block set, a ball screw set, a slide block, a servo mounting plate and a servo motor, a rocker arm seat, a rocker arm shaft, a rocker arm clamp, a centering block, an eccentric shaft, a tension spring and a cylinder are fixedly connected to the slide block;

[0008] The vertical bar feeding mechanism comprises a rotary cylinder mounting seat, a rotary clamping cylinder, a clamping jaw, a feeding machine box mounting block, a feeding groove, a receiving plate, a chain, a motor, a guide rod, a slide block, a feeding plate, a feeding machine box, a pushing cylinder, a square tube, a chain wheel, and the vertical steel bar is a material to be processed;

[0009] The horizontal bar feeding mechanism comprises a feeding machine box, a pushing cylinder, a slide block, a slide rod, a rack panel, a slide table cylinder seat, a slide table cylinder, a rotary cylinder seat, a rotary cylinder, a rocker arm, a magnetic head, a magnet, a welding seat, a motor, a feeding machine box mounting block, a feeding groove, a chain, a chain wheel and a square tube, and a chain rotary mechanism and a feeding plate are further arranged.

[0010] The welding cross mechanism comprises a position cylinder mounting seat, a slide rail slide block, a slide plate, a rocker arm two, an electrode seat, an electrode one, a rocker arm shaft two, a rocker arm cover plate one, a centering tooth block, a position cylinder and a rocker arm cylinder one;

[0011] The welding lower chord mechanism comprises an electrode two, an electrode mounting seat, a rocker arm three, a rocker arm shaft three, a rocker arm seat two, a centering gear seat, a centering rack, a centering gear, a rack limiting bearing, a rocker arm cylinder two, and the welding lower chord mechanism has two groups, which are respectively arranged on two sides of the steel bar truss, and the electrode two is aligned with the lower chord of the steel bar truss.

[0012] The steel bar truss positioning mechanism comprises a base plate, a cylinder two, a rocker arm shaft four, a cylinder head push rod, a rocker arm positioning block, a balance auxiliary block and a rocker arm shaft mounting plate, and the mounting plate is fixedly connected with the base plate.

[0013] The welding upper chord mechanism comprises a long slide block slide rail fixedly arranged on the portal frame, a large slide plate, a ball screw mounting seat, a servo motor mounting seat, a servo motor two, a ball screw sleeve two, a welding arm slide block, a clamping arm mounting seat, a centering slide block slide rail, a rocker arm connecting rod, a cylinder head slide block, a clamping cylinder one, a transverse slide rail slide block, a hook-shaped arm, a clamping rocker arm one, a fixed electrode mounting seat, a fixed electrode, a vertical bar centering block, a rocker arm shaft five, a rocker arm cover plate two, a floating joint, a welding cylinder, an upper chord clamping electrode and an upper chord clamping electrode mounting seat.

[0014] The steel bar truss feeding manipulator comprises a mounting seat, a drag chain slot, a slide rail, a ball screw sleeve three, a connecting rod, a cylinder head push block, a clamping cylinder two, a cylinder mounting frame, a slide block four, a clamping rocker arm two, a servo motor three, a ball screw mounting seat and a motor mounting seat.

[0015] Further, the above-mentioned mechanisms are linearly arranged on the rack in the processing sequence, are hung above the rack by the steel bar feeding mechanism, and the upper rocker arm clamping jaws of the steel bar feeding mechanism clamp the vertical steel bars from the vertical bar rotating clamping cylinder, and then are sent to the welding seat, the electrode two and the fixed electrode, so as to complete the transfer process of the products in each process; the function of the steel bar truss feeding manipulator is to send the steel bar truss below the manipulator to the lower welding machine by manual or other mechanisms, and then to pull out the welded steel bar truss.

[0016] Further, the mounting feet are fixedly connected with the cross beam plate, and the whole component is installed on the table surface of the rack by the two mounting feet, so that the whole mechanism cross beam is suspended on the table surface; the cross beam plate is provided with an X-axis linear module composed of a slide rail slide block sleeve, a ball screw sleeve one, a slide block one, a servo mounting plate and a servo motor one; the slide block one is fixedly connected with a rocker arm seat one, a rocker arm shaft one, a rocker arm clamping jaw, a centering block and an eccentric shaft, and the upper end of the rocker arm clamping jaw is provided with a pull spring and a cylinder one, and the pull spring and the cylinder one control the opening and closing of the rocker arm clamping jaw.

[0017] Further, the rotating cylinder mounting seat fixes the rotating clamping cylinder on the rack table top, the chain output of the feeding machine is opposite to the clamp mouth, the feeding groove is a reverse triangle, the bottom is provided with a top plate and a pushing cylinder, the top plate is connected with the feeding machine box and the top plate by the guide rod and the sliding block respectively, the feeding mechanism composed of the chain, the square tube, the chain wheel and the motor is fixedly connected above the feeding machine box, the top plate is pushed by the pushing cylinder to push the vertical steel in the feeding groove to the chain, and the top of the top plate and the receiving plate is inclined downward.

[0018] Further, the pushing cylinder is installed at the bottom of the feeding machine box, the top plate is installed at the piston rod head of the pushing cylinder, the guide rod and the sliding block are connected with the feeding machine box and the top plate respectively, the feeding mechanism composed of the chain, the motor and the rotating mechanism is fixedly connected above the feeding machine box, the receiving plate is installed between the chain and the feeding groove, the feeding machine box mounting block is fixedly connected to the side of the feeding machine box, and the feeding machine is connected to the rack panel.

[0019] Further, the position cylinder mounting seat is installed on the side of the rack table panel, the sliding rail block is installed on the table panel, the sliding plate is installed on the sliding block, the second rocker shaft is embedded on the sliding plate, two second rockers are symmetrically installed on the second rocker shaft, two centering teeth are fixedly welded on the two second rockers, the first rocker cover is attached to the upper surface of the second rocker, the two second rocker shafts are pulled from the upper end, the electrode seat is arranged at the front end of the second rocker, two electrodes are installed on the two electrode seats, the position cylinder is installed on the position cylinder mounting seat, the piston rod head is fixedly connected with the sliding plate, and the first rocker cylinder is installed at the rear end of the second rocker.

[0020] Further, the rocker seat two is composed of two plates with rocker shaft three holes parallel welded on the mounting plate, the rocker three is installed in the middle of the two plates, the force is very stable, and it is not easy to malfunction; the centering mechanism is fixedly connected on the rocker seat two by the centering gear seat, the centering gear is installed on the centering gear seat, the centering rack is rotatably connected on the two rockers three, one end of which is respectively towards the centering gear, and the tooth surface is coupled with the centering gear, the rack limiting bearing is installed on the outside of the centering rack to ensure that the coupling of the centering gear and the centering rack will not be separated; the front end of the two rockers three is respectively provided with two electrode mounting seats, and the two electrodes two are respectively installed on the electrode mounting seats; the rear end of the rocker is provided with a rocker cylinder two for providing clamping force for welding; meanwhile, the lower chord reinforcement mechanism has two groups, which are respectively installed on the two sides of the steel bar truss.

[0021] Further, the workbench, the base plate and the mounting plate are fixedly connected, the cylinder two is invertedly installed on the base plate, the two rocker shaft mounting plates are installed on the left and right sides of the cylinder two, the two rocker shafts four are installed at the lower corner positions of the rocker shaft mounting plates, the cylinder head push rod is installed on the piston rod head of the cylinder two, the rocker positioning block and the balance auxiliary block are fixedly welded together, the prong of the rocker positioning block and the balance auxiliary block is clamped on the cylinder head push rod, and the action of the cylinder two controls the opening and closing of the rocker positioning block.

[0022] The gantry is provided with a long sliding block slide rail, a large slide plate is installed on the sliding block, a servo motor mounting seat and a ball screw mounting seat are sequentially installed on the uppermost end of the gantry; a servo motor two is installed on the servo motor mounting seat at the uppermost end, a ball screw sleeve two and the servo motor two are connected to form a Y-axis driving system, the large slide plate is fixedly connected with the ball screw nut in the ball screw sleeve two, so as to realize the up-down movement of the large slide plate controlled by the servo motor two, a hook-shaped arm and a welding cylinder are fixedly connected on the large slide plate, a welding arm sliding block is movably connected with the hook-shaped arm through the butt joint of the transverse slide rail sliding block, and the two ends of the floating joint are respectively connected with the piston rod head of the welding arm sliding block and the welding cylinder; a clamping arm mounting seat is fixedly connected with the welding arm sliding block, a rocker shaft five, a clamping cylinder one and a centering sliding block slide rail are sequentially installed on the clamping arm mounting seat from bottom to top, a cylinder head sliding block is fixedly connected with the sliding block in the centering sliding block slide rail, two clamping rockers one are installed on the two rocker shaft fives, and the heads are located on the two sides of the cylinder head sliding block; a rocker cover plate two is installed on the front end of the rocker shaft five to cover the clamping rocker one, a fixed electrode mounting seat, a fixed electrode and a vertical reinforcement centering block are sequentially stacked on the hook-shaped end of the hook-shaped arm; an upper chord reinforcement clamping electrode and an upper chord reinforcement clamping electrode mounting seat are sequentially installed on the lower end of the clamping rocker.

[0023] Further, the mounting seat is provided with a drag chain groove and slide rails; a ball screw sleeve three is located between the two slide rails, and two ends are mounted between the mounting seat and the ball screw mounting seat; the ball screw mounting seat is mounted at the front end of the slide rail; the motor mounting seat is mounted below the front end of the drag chain groove; a servo motor three is mounted on the motor mounting seat and connected through a matched connecting shaft and the ball screw sleeve three; a slider four is mounted on the two slide rails, and a ball screw passes through the middle of the slider four; a cylinder mounting bracket is mounted on the upper part of the slider four; a clamping cylinder two is mounted on the upper end of the cylinder mounting bracket; a cylinder head push block is mounted on the piston rod head of the clamping cylinder two; two clamping rocker arms two are mounted on the lower part of the slider four, and are located on the two sides of the slider four respectively; a half-tooth gear is arranged between the two clamping rocker arms two and is in engagement for centering; a connecting rod composed of a rod end joint bearing and a screw rod is connected with the cylinder head push block and the clamping rocker arm two at both ends respectively, and each side of the slider has a set of;

[0024] The discharge electrodes of the transformer are connected with two electrode one in the welding cross mechanism, two electrode two in the welding lower chord mechanism, the fixed electrode in the welding upper chord mechanism and the upper chord clamping electrode respectively, and in the working process, the discharge welding of each mechanism is connected with the transformer; the difference is that the electrodes are pressed to form a loop for discharge welding when the mechanism works, and the electrodes of the mechanism not working are in an open state and do not form a loop, so no welding is performed; all the electrodes and electrode mounting seats of the machine and the connected soft and hard copper belts are insulated from the rack, and are solved by means of insulating pads, insulating sleeves and suspension installation.

[0025] Compared with the prior art, the beneficial effects of the present application are that:

[0026] The present application reduces the land occupation area of manual work and labor through the automatic welding structure combined with the discharge welding method, further reduces the cost, uses the resistance welding method without welding rod, reduces the cost, and the product is beautiful, reliable in welding firmness, and no defective products appear, and the occupational diseases that may occur in long-term electric welding work of workers are eliminated; at the same time, the workshop environment is improved, the electric welding light pollution and air pollution in the workshop are completely eliminated, and the modern clean production process requirements can be better implemented. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application.

[0028] Figure 1 It is a schematic diagram of the whole machine structure of the present application;

[0029] Figure 2 It is a schematic diagram of the rack structure of the present application;

[0030] Figure 3Structure schematic view of the reinforcing steel bar feeding mechanism of the present application;

[0031] Figure 4 Structure schematic view of the vertical reinforcing steel bar feeding mechanism of the present application;

[0032] Figure 5 Structure schematic view of the horizontal reinforcing steel bar feeding mechanism of the present application;

[0033] Figure 6 Structure schematic view of the cross welding mechanism of the present application;

[0034] Figure 7 Structure schematic view of the lower chord welding mechanism of the present application;

[0035] Figure 8 Structure schematic view of the reinforcing steel bar truss positioning mechanism of the present application;

[0036] Figure 9 Structure schematic view of the upper chord welding mechanism of the present application;

[0037] Figure 10 Partial bottom view of the upper chord welding mechanism of the present application;

[0038] Figure 11 Structure schematic view of the reinforcing steel bar truss feeding mechanical hand of the present application.

[0039] In the figure: 1 frame, 2 steel feeding mechanism, 3 vertical rib feeding mechanism, 4 horizontal rib feeding mechanism, 5 cross welding mechanism, 6 lower chord welding mechanism, 7 steel truss positioning mechanism, 8 upper chord welding mechanism, 9 steel truss feeding manipulator, 10 workbench, 11 steel truss, 12 horizontal positioning adjusting plate, 13 castor, 14 transformer, 15 worm gear reducer, 16 drive shaft, 17 electrical box rack, 18 ground rail, 20 mounting foot, 21 cross beam plate, 22 slide rail slide block set, 23 ball screw set one, 24 slide block one, 25 rocker arm clamping jaw, 26 pull spring, 27 cylinder one, 28 servo motor one, 29 servo mounting plate, 30 rotary cylinder mounting seat, 31 clamping jaw, 32 rotary clamping cylinder, 33 vertical steel rib, 34 feeding machine box mounting block one, 35 discharging groove one, 36 receiving plate one, 37 chain one, 38 motor one, 39 guide rod, 300 slide block two, 301 material pushing plate one, 302 feeding machine box one, 303 material pushing cylinder one, 304 square tube one, 305 chain wheel one, 40 feeding machine box two, 41 material pushing cylinder two, 42 slide block three, 43 slide rod, 44 frame panel, 45 slide table cylinder seat, 46 slide table cylinder, 47 rotary cylinder, 48 rocker arm one, 49 magnetic suction head, 400 magnet, 401 welding seat, 403 rotary cylinder seat, 405 motor two, 406 feeding machine box mounting block two, 407 discharging groove two, 408 chain rotary mechanism, 409 material pushing plate two, 410 receiving plate two, 50 position cylinder mounting seat, 51 slide rail slide block, 52 slide plate, 53 rocker arm two, 54 electrode seat, 55 electrode one, 56 rocker arm shaft two, 57 rocker arm cover plate one, 58 centering tooth block, 59 position cylinder, 500 rocker arm cylinder one, 60 electrode two, 61 electrode mounting seat, 62 rocker arm three, 63 rocker arm shaft three, 64 rocker arm seat two, 65 centering gear seat, 66 centering rack, 67 rocker arm cylinder two, 68 centering gear, 69 rack limiting bearing, 70 base panel, 71 cylinder two, 72 rocker arm shaft four, 73 cylinder head push rod, 75 rocker arm positioning block, 76 balance auxiliary block, 77 rocker arm shaft mounting plate, 78 mounting plate, 80 gantry, 81 long slide block slide rail, 82 large slide plate, 83 ball screw mounting seat one, 84 servo motor mounting seat, 85 servo motor two, 86 ball screw set two, 87 welding arm slide block, 88 clamping arm mounting seat, 89 centering slide block slide rail, 800 rocker arm connecting rod, 801 cylinder head slide block, 802 clamping cylinder one, 803 transverse slide rail slide block, 804 hook-shaped arm, 805 clamping rocker arm one, 806 fixed electrode mounting seat, 807 fixed electrode, 808 vertical rib centering block, 809 rocker arm shaft five, 810 rocker arm cover plate two, 811 floating joint, 812 welding cylinder, 813 upper chord clamping electrode, 814 upper chord clamping electrode mounting seat, 91 mounting seat, 92 drag chain groove, 93 slide rail, 94 ball screw set three, 95 connecting rod, 96 cylinder head push block, 97 clamping cylinder two, 98 cylinder mounting frame, 99 slide block four, 100 clamping rocker arm two, 101 servo motor three, 102 ball screw mounting seat two,103 motor mounting seat. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0041] Reference Figures 1-11 A steel bar truss head resistance welding machine, comprising a rack 1, further comprising: a steel bar feeding mechanism 2 arranged above the rack 1, a vertical bar feeding mechanism 3 arranged beside the rack 1, a horizontal bar feeding mechanism 4, a welding cross mechanism 5 arranged in the middle of the rack 1, a lower chord welding mechanism 6, a steel bar truss positioning mechanism 7, an upper chord welding mechanism 8 arranged at one end of the rack 1, and a steel bar truss feeding manipulator 9.

[0042] The rack 1 comprises a workbench 10, a transverse positioning and adjusting plate 12, a foot wheel 13, a transformer 14, a worm gear reducer 15, a driving shaft 16, an electrical box rack 17, a ground rail 18, and a connecting copper strip, and the steel bar truss 11 is a product to be processed;

[0043] The steel bar feeding mechanism 2 comprises a mounting foot 20, an X-axis linear module composed of a cross beam plate 21, a slide rail and slide block set 22, a ball screw set 23, a slide block 24, a servo mounting plate 29, and a servo motor 28, and the slide block 24 is fixedly connected with a rocker arm base 200, a rocker arm shaft 201, a rocker arm jaw 25, a centering block 202, an eccentric shaft 203, a tension spring 26, and a cylinder 27;

[0044] The vertical bar feeding mechanism 3 comprises a rotary cylinder mounting seat 30, a rotary clamping cylinder 32, a clamping jaw 31, a feeding machine box mounting block 34, a feeding groove 35, a receiving plate 36, a chain 37, a motor 38, a guide rod 39, a slide block 300, a feeding plate 301, a feeding machine box 302, a pushing cylinder 303, a square tube 304, a chain wheel 305, and a vertical steel bar 33 which is a material to be processed;

[0045] The horizontal bar feeding mechanism 4 comprises a feeding machine box 40, a pushing cylinder 41, a slide block 42, a slide rod 43, a rack face plate 44, a slide table cylinder seat 45, a slide table cylinder 46, a rotary cylinder seat 403, a rotary cylinder 47, a rocker arm 48, a magnetic suction head 49, a magnet 400, a welding seat 401, a motor 405, a feeding machine box mounting block 406, a feeding groove 407, a chain 408, a chain wheel 408, and a square tube 408, and a feeding plate 409;

[0046] The welding cross mechanism 5 comprises a position cylinder mounting seat 50, a slide rail and slide block 51, a slide plate 52, a rocker arm 53, an electrode seat 54, an electrode 55, a rocker arm shaft 56, a rocker arm cover plate 57, a centering tooth block 58, a position cylinder 59, and a rocker arm cylinder 500;

[0047] The under-chord reinforcement mechanism 6 includes electrode two 60, electrode mounting seat 61, rocker arm three 62, rocker shaft three 63, rocker arm seat two 64, centering gear seat 65, centering rack 66, centering gear 68, rack limiting bearing 69, rocker arm cylinder two 67, the under-chord reinforcement mechanism 6 has two groups, which are respectively arranged on both sides of the steel bar truss 11, and the electrode two 60 is aligned with the lower chord of the steel bar truss 11;

[0048] The steel bar truss positioning mechanism 7 includes base panel 70, cylinder two 71, rocker shaft four 72, cylinder head push rod 73, rocker arm positioning block 75, balance auxiliary block 76, rocker shaft mounting plate 77, and mounting plate 78 is fixedly connected with the base panel 70;

[0049] The upper-chord reinforcement mechanism 8 includes long sliding block sliding rail 81 fixed on the gantry 80, large sliding plate 82, ball screw mounting seat 83, servo motor mounting seat 84, servo motor two 85, ball screw sleeve two 86, welding arm sliding block 87, clamping arm mounting seat 88, centering sliding block sliding rail 89, rocker arm connecting rod 800, cylinder head sliding block 801, clamping cylinder one 802, transverse sliding rail sliding block 803, hook-shaped arm 804, clamping rocker arm one 805, fixed electrode mounting seat 806, fixed electrode 807, vertical reinforcement centering block 808, rocker shaft five 809, rocker cover plate two 810, floating joint 811, welding cylinder 812, upper chord reinforcement clamping electrode 813 and upper chord reinforcement clamping electrode mounting seat 814;

[0050] The steel bar truss feeding manipulator 9 includes mounting seat 91, drag chain slot 92, sliding rail 93, ball screw sleeve three 94, connecting rod 95, cylinder head push block 96, clamping cylinder two 97, cylinder mounting bracket 98, sliding block four 99, clamping rocker arm two 100, servo motor three 101, ball screw mounting seat 102, motor mounting seat 103.

[0051] Further, the above mechanisms are linearly arranged on the rack 1 according to the processing sequence, and are suspended above the rack by the steel bar feeding mechanism 2, the upper rocker arm clamping jaw 25 clamps the vertical steel bar 33 from the vertical reinforcement rotating clamping cylinder 32, and sends it to the welding seat 401, the electrode two 60 and the fixed electrode 807, thereby completing the transfer process of the products of each process; the function of the steel bar truss feeding manipulator 9 is to send the steel bar truss below the manipulator to the lower welding machine, and then pull out the welded steel bar truss 11.

[0052] The machine can process products with different specifications, and two machines are needed to weld two heads, so one machine is installed and fixed with feet, and the other machine is equipped with casters 13 and ground rails 18. In order to match the installation height of each mechanism, the desktop has two high and low surfaces, and the bottom can be installed with a base or casters 13. Two of them are also equipped with worm gear reducers 15 and motors as driving wheels to facilitate the adjustment of the position of the welded steel bar truss 11 with different lengths; the electrical box shelf 17 is suspended and connected to the main frame to facilitate the movement of the whole machine on the track; the operation panel is installed on one side of the chord welding mechanism 8 to facilitate observation of the working condition of all parts.

[0053] The mounting feet 20 are fixedly connected to the cross beam plate 21, and the entire component is installed on the tabletop of the frame 1 by the two mounting feet, so that the entire mechanism cross beam is suspended on the tabletop; the cross beam plate 21 is equipped with a X-axis linear module composed of a sliding rail sliding block set 22, a ball screw set 1 23, a sliding block 1 24, a servo mounting plate 29, and a servo motor 1 28; the sliding block 1 24 is fixedly connected with a rocker arm seat 1 200, a rocker arm shaft 1 201, a rocker arm jaw 25, a centering block 202, and an eccentric shaft 203, and the upper end of the rocker arm jaw 25 is equipped with a tension spring 26 and a cylinder 1 27, which control the opening and closing of the rocker arm jaw 25.

[0054] The rotary cylinder mounting seat 30 fixes the rotary clamping cylinder 32 to the tabletop of the frame 1, the output port of the chain 1 37 of the feeding machine is opposite to the clamp jaw 31, the discharge chute 1 35 is in the shape of an inverted triangle, and the bottom is equipped with a material pushing plate 1 301 and a pushing cylinder 1 303. The material pushing plate 1 301 is connected to the feeding machine box 1 302 and the material pushing plate 1 301 by a guide rod 39 and a sliding block 2 300, respectively. The feeding mechanism composed of the chain 1 37, the square tube 1 304, the chain wheel 1 305, and the motor 1 38 is fixedly connected above the feeding machine box 1 302, and the material pushing plate 1 301 is pushed by the pushing cylinder 1 303 to push the vertical steel bar 33 in the discharge chute 1 35 onto the chain 1 37. The top of the material pushing plate 1 301 and the material receiving plate 1 36 near the chain side is made into a bevel downward, and the vertical steel bar 33 pushed up automatically rolls down to the chain 1 37.

[0055] The pushing cylinder two 41 is installed at the bottom of the upper feeding machine box two 40, the top feeding plate two 409 is installed at the head of the piston rod of the pushing cylinder two 41, the sliding rod 43 and the sliding block three 42 are connected to the upper feeding machine box two 40 and the top feeding plate two 409 respectively, the feeding mechanism composed of the chain rotation mechanism 408 and the motor two 405 is fixedly connected above the upper feeding machine box two 40, the receiving plate two 410 is installed between the chain and the discharging groove two 407, the upper feeding machine box mounting block two 406 is fixedly connected to the side of the upper feeding machine box two 40, and is used for connecting the upper feeding machine to the rack panel 44; the welding seat 401 is installed at a position opposite to the end of the chain at a distance, and the swinging feeding mechanism composed of the sliding table cylinder seat 45, the sliding table cylinder 46, the rotary cylinder seat 403, the rotary cylinder 47, the rocker arm one 48, the magnetic suction head 49 and the magnet 400 is used for sucking the horizontal rib on the chain two, rotating 180 degrees and placing the horizontal rib on the welding seat, wherein the sliding table cylinder 46 is installed on the sliding table cylinder seat 45, the rotary cylinder seat 403 is installed on the sliding table cylinder 46, the rotary cylinder 47 is installed on the rotary cylinder seat 403, the rocker arm one 48 is installed on the rotary cylinder 47, the magnetic suction head 49 is installed on the rocker arm one 48, and the magnet 400 is inlaid on the magnetic suction head 49. When the magnetic suction head 49 rotates 180 degrees on the chain two and reaches the welding seat 401, the horizontal rib has also been turned over to the state that the magnetic suction head 49 is below and the horizontal rib is above, and when the horizontal rib continues to rotate downward, the two heads of the horizontal rib are placed on the welding seat 401, the magnetic suction head 49 is separated from the horizontal rib, and the sliding table cylinder 46 is retracted to exit outside the welding seat 401, and then reverses and pushes out to the chain two to suck the next horizontal rib.

[0056] The position cylinder mounting seat 50 is installed on the side of the desktop panel of the rack 1, the sliding rail sliding block 51 is installed on the desktop panel, the sliding plate 52 is installed on the sliding block, the rocker arm shaft two 56 is inlaid on the sliding plate 52, the two rocker arms two 53 are symmetrically installed on the rocker arm shaft two 56, the two centering tooth blocks 58 are fixedly welded on the two rocker arms two 53 respectively, the rocker arm cover plate one 57 is attached to the upper surface of the rocker arm two 53 to pull the two rocker arm shafts two 56 from the upper end, the electrode seat 54 is arranged at the front end of the rocker arm two 53, the two electrodes one 55 are installed on the two electrode seats 54 respectively, the position cylinder 59 is installed on the position cylinder mounting seat 50, and the piston rod head is fixedly connected with the sliding plate 52, and the rocker arm cylinder one 500 is installed at the rear end of the rocker arm two 53.

[0057] The rocker seat two 64 is composed of two plates with rocker shaft three 63 holes parallel welded on the mounting plate, the rocker three 62 is installed in the middle of the two plates, which is stable in force and not prone to failure; the centering mechanism is fixedly connected to the rocker seat two 64 by the centering gear seat 65, the centering gear 68 is installed on the centering gear seat 65, the centering rack 66 is rotatably connected to the two rockers three 62 at both ends, respectively, one end facing the centering gear 68, and the tooth surface thereof is coupled with the centering gear 68, the rack limiting bearing 69 is installed on the outside of the centering rack 66, ensuring that the coupling of the centering gear 68 and the centering rack 66 will not be separated; the front ends of the two rockers three 62 are respectively provided with two electrode mounting seats 61, and two electrodes two 60 are respectively installed on the electrode mounting seats 61; the rear end of the rocker is provided with a rocker cylinder two 67 to provide clamping force for welding; meanwhile, there are two groups of welding lower chord mechanisms installed on both sides of the steel bar truss 11.

[0058] The base plate 70 and the mounting plate 78 are fixedly connected, the cylinder two 71 is installed upside down on the base plate 70, two rocker shaft mounting plates 77 are installed on the left and right sides of the cylinder two 71, the left plate is hidden in the figure, two rocker shafts four 72 are installed at the lower corners of the rocker shaft mounting plates 77, a cylinder head push rod 73 is installed at the head of the piston rod of the cylinder two 71, a rocker positioning block 75 and a balance auxiliary block 76 are fixedly welded with the rocker shaft four 72, the fork head of the rocker positioning block 75 and the balance auxiliary block 76 is clamped on the cylinder head push rod 73, and the action of the cylinder two 71 controls the opening and closing of the rocker positioning block 75;

[0059] The gantry 80 is provided with a long sliding block sliding rail 81, a large sliding plate 82 installed on the sliding block, a servo motor mounting seat 84 and a ball screw mounting seat 83 installed on the uppermost end of the gantry 80 in sequence; a servo motor two 85 is installed on the servo motor mounting seat 84 at the uppermost end, a ball screw sleeve two 86 and the servo motor two 85 are connected into a Y-axis driving system, the large sliding plate 82 is fixedly connected with a ball screw nut in the ball screw sleeve two 86, so that the servo motor two 85 controls the up-down movement of the large sliding plate 82, a hook-shaped arm 804 and a welding cylinder 812 are fixedly connected on the large sliding plate 82, a welding arm sliding block 87 is movably connected with the hook-shaped arm 804 through the butt joint of a transverse sliding rail sliding block 803, and two ends of a floating joint 811 are respectively connected with the welding arm sliding block 87 and a piston rod head of the welding cylinder 812; a clamping arm mounting seat 88 is fixedly connected with the welding arm sliding block 87, a rocker shaft five 809, a clamping cylinder one 802 and a centering sliding block sliding rail 89 are installed on the clamping arm mounting seat 88 in sequence from bottom to top, a cylinder head sliding block 801 is fixedly connected with a sliding block in the centering sliding block sliding rail 89, two clamping rocker arms one 805 are installed on the two rocker shaft fives 809, and heads are located on both sides of the cylinder head sliding block 801 upward; a rocker cover two 810 is installed at the front end of the rocker shaft five 809 to cover the clamping rocker arm one 805, a fixed electrode mounting seat 806, a fixed electrode 807 and a vertical rib centering block 808 are installed on the hook-shaped end of the hook-shaped arm 804 in sequence; an upper chord rib clamping electrode 813 and an upper chord rib clamping electrode mounting seat 814 are installed on the lower end of the clamping rocker arm one 805 in sequence.

[0060] A drag chain groove 92 and a sliding rail 93 are installed on the mounting seat 91; a ball screw sleeve three 94 is located between the two sliding rails 93 and is installed between the mounting seat 91 and a ball screw mounting seat 102 at both ends; the ball screw mounting seat 102 is installed at the front end of the sliding rail 93; a motor mounting seat 103 is installed below the front end of the drag chain groove 92; a servo motor three 101 is installed on the motor mounting seat 103 and is connected with the ball screw sleeve three 94 through a matched connecting shaft and a ball screw sleeve; a sliding block four 99 is installed on the two sliding rails 93, and a ball screw passes through the middle of the sliding block four 99; a cylinder mounting bracket 98 is installed on the upper part of the sliding block four 99; a clamping cylinder two 97 is installed on the upper end of the cylinder mounting bracket 98; a cylinder head push block 96 is installed on the piston rod head of the clamping cylinder two 97; two clamping rocker arms two 100 are installed on the lower part of the sliding block four 99 and are located on both sides of the sliding block four 99, and a half-tooth gear is arranged between the two clamping rocker arms two 100 to be engaged for centering; a connecting rod 95 composed of a rod end joint bearing and a screw rod is connected with the cylinder head push block 96 and the clamping rocker arm two 100 at both ends, and each side of the sliding block has a set of the connecting rod 95;

[0061] The discharge electrodes of the transformer 14 are connected with two electrodes one 55 in the welding cross mechanism 5, two electrodes two 60 in the welding lower chord mechanism 6, the fixed electrode 807 in the welding upper chord mechanism 8 and the upper chord clamping electrode 813 respectively, in the working process, the discharge welding of each mechanism is connected with the transformer 14 to discharge welding; the difference is that the electrodes are pressed to form a loop discharge welding when the mechanism works, the electrodes of the mechanism not working are in the open state and do not form a loop to not weld; the electrodes and electrode mounting seats of the machine and the connecting soft and hard copper belts are all insulated from the rack, and are solved by the insulating pad, the insulating sleeve and the suspension installation.

[0062] The working principle and use process of the present application are as follows:

[0063] The first step: the corresponding vertical steel bars 33 and horizontal bars are poured into the discharge chute one 35 and the discharge chute two 407 by manual, after the machine is started, the pushing cylinder one 303 and the pushing cylinder two 41 are started to push the vertical steel bars 33 and the horizontal bars in the respective discharge chute out to the respective chain, the chain is automatically operated to transport the steel bars to the chain end to be temporarily stopped for use;

[0064] The rotating clamping cylinder 32 drives the clamp jaw 31 to open and then rotates to the position where the clamp jaw 31 is opposite to the vertical steel bar 33 on the chain end, at this time, the chain one 37 is started, a vertical steel bar 33 flows into the clamp jaw 31 under the driving of the chain one 37 and the chain is temporarily stopped, the clamp jaw 31 clamps the vertical steel bar 33 and then the rotating cylinder rotates 90 degrees to the vertical position; at this time, the servo motor one 28 is started to move the rocker arm clamping jaw 25 forward, so that the jaw of the rocker arm clamping jaw 25 is aligned with the vertical steel bar 33, the clamping cylinder one 27 is started to clamp the rocker arm clamping jaw 25, the vertical steel bar 33 is clamped in the jaw, at this time, the clamping cylinder in the rotating clamping cylinder 32 is opened, and the steel bar feeding mechanism 2 can feed the vertical steel bar 33 to the next process;

[0065] Second step: the rotary cylinder 47 in the transverse rib feeding mechanism 4 rotates the rocker arm 48 to the chain feeding end position. The magnetic suction head 49 on the rocker arm 48 adsorbs the transverse rib when it is close to the chain end. Then the rotary cylinder 47 is rotated by more than 180 degrees. When it reaches the welding seat 401, the vertical steel bar 33 has also been turned over to the state that the magnetic suction head 49 is below and the vertical steel bar 33 is above. When it continues to rotate downward, the two ends of the transverse rib are placed on the welding seat 401, and the magnetic suction head 49 is separated from the transverse rib. The magnetic suction head 49 is withdrawn to the outside of the welding seat 401 by the backward movement of the sliding table cylinder 46, and then it is rotated and pushed back to the chain above to adsorb the next transverse rib. At this time, the steel bar automatic feeding mechanism sends the clamped vertical steel bar 33 to the welding seat 401, and forms a reversed cross with the transverse rib on the welding seat 401. Then the position cylinder 59 in the welding cross mechanism is started, and the opened rocker arm 53 is pushed to the left and right positions of the welding seat 401. Then the welding cylinder 500 is started, and the two electrodes 55 clamp and discharge weld the vertical steel bar 33 and the transverse rib. After welding, the opened rocker arm is withdrawn to the original position.

[0066] Third step: the steel bar feeding mechanism 2 continues to advance while clamping the welded cross, stops after reaching the electrode 60 of the lower chord steel bar mechanism 6, and the two ends of the transverse rib are respectively located in the electrode 60 of the two lower chord steel bar mechanisms 6. The steel bar truss feeding manipulator 9 sends the head of the steel bar truss 11 into the electrode 60 of the lower chord steel bar mechanism 6, and the two lower chord steel bar heads of the steel bar truss 11 are placed above the transverse rib in a cross placement state. At this time, the cylinder 71 in the steel bar truss positioning mechanism is started, and the two rocker arm positioning blocks 75 clamp and accurately position the two lower chord steels in the corresponding position of the transverse rib. Then the lower chord steel bar cylinder 67 in the lower chord steel bar mechanism 6 is started, and the two electrodes 60 driven by the two rocker arms 62 clamp the lower chord steels of the steel bar truss 11 and the two ends of the transverse rib in the cross. Then the two groups of electrodes 60 discharge and weld the two ends of the transverse rib at the bottom of the cross with the lower chord steel bar heads of the steel bar truss 11. The two groups of lower chord steel bar mechanisms 6 release the rocker arms after welding.

[0067] Fourth step: the reinforcement feeding mechanism 2 clamps the already welded cross and the reinforcement truss 11 and continues to move to the position right below the upper chord clamping electrode 813 of the welding chord mechanism 9, the vertical reinforcement 33 is right opposite the upper vertical reinforcement centering block 808, then the rocker jaw 25 is loosened and returns to the original position, the servo motor 2 85 is started to drive the large slide plate 82 to move close to the lower part of the reinforcement truss 11, so as to drive the entire welding assembly fixed on the large slide plate 82 to move close to the reinforcement truss 11, in this process, the vertical reinforcement centering block 808 positions the lower vertical reinforcement 33 in the fixed electrode 807 slot, at the same time, the upper chord clamping electrode 813 at the lower head of the two clamping rocker arms 1 805 fixed on the welding arm slide block 87 stops after moving to the both sides of the upper chord of the reinforcement truss 11, the clamping cylinder 1 802 is started to drive the centering slide block 801 to move along the slide rail, through the rocker arm connecting rod 800 to drive the lower end of the upper chord clamping electrode 813 of the clamping rocker arm 1 805 to rotate towards each other, so as to clamp the upper chord of the reinforcement truss 11, then the welding cylinder 812 is started to make the vertical reinforcement 33 in the cross resist against the welding chord fixed electrode 807, finally, the discharge between the upper chord clamping electrode 813 and the fixed electrode 807, the upper chord of the reinforcement truss 11 and the vertical reinforcement 33 in the cross are welded together, after welding, the reverse action is reset, so as to complete the entire work of welding the head reinforcement on the reinforcement truss, the reinforcement truss with welded head is pulled out by the reinforcement truss feeding manipulator, and then manually packed and lifted away.

[0068] The function of the reinforcement truss feeding manipulator is to accurately send the reinforcement truss under the manipulator to the position of the lower welding machine, and then pull out the finished product after welding to other flow lines. The other flow lines can also not be used, and the reinforcement truss is placed under the manipulator and taken away by manual work.

Claims

1. A steel trussed head electric resistance welding machine comprising a frame (1), characterized in that, Also include: The steel reinforcement feeding mechanism (2) is arranged on the upper part of the rack (1), the vertical reinforcement feeding mechanism (3) is arranged beside the rack (1), the horizontal reinforcement feeding mechanism (4) is arranged beside the rack (1), the welding cross frame mechanism (5) is arranged in the middle of the rack (1), the welding lower chord mechanism (6) is arranged in the middle of the rack (1), the steel reinforcement truss positioning mechanism (7) is arranged in the middle of the rack (1), the welding upper chord mechanism (8) is arranged at one end of the rack (1), and the steel reinforcement truss feeding manipulator (9) is arranged at one end of the rack (1); The rack (1) comprises a workbench (10), a transverse positioning adjusting plate (12), a foot wheel (13), a transformer (14), a worm gear reducer (15), a driving shaft (16), an electric box rack (17), a ground rail (18) and a connecting copper belt, and the steel reinforcement truss (11) is a product to be processed; The steel reinforcement feeding mechanism (2) comprises a mounting foot (20), an X-axis linear module composed of a cross beam plate (21), a slide rail slide block set (22), a ball screw set (23), a slide block (24), a servo mounting plate (29) and a servo motor (28), and the slide block (24) is fixedly connected with a rocker arm base (200), a rocker arm shaft (201), a rocker arm jaw (25), a centering block (202), an eccentric shaft (203), a tension spring (26) and a cylinder (27); The vertical reinforcement feeding mechanism (3) comprises a rotary cylinder mounting seat (30), a rotary clamping cylinder (32), a clamping jaw (31), an upper feeding machine box mounting block (34), a feeding groove (35), a material receiving plate (36), a chain (37), a motor (38), a guide rod (39), a slide block (300), a material ejecting plate (301), an upper feeding machine box (302), a material pushing cylinder (303), a square tube (304), a chain wheel (305), and the vertical steel reinforcement (33) is a material to be processed; The horizontal reinforcement feeding mechanism (4) comprises an upper feeding machine box (40), a material pushing cylinder (41), a slide block (42), a slide rod (43), a rack face plate (44), a slide table cylinder seat (45), a slide table cylinder (46), a rotary cylinder seat (403), a rotary cylinder (47), a rocker arm (48), a magnetic suction head (49), a magnet (400), a welding seat (401), a motor (405), an upper feeding machine box mounting block (406), a feeding groove (407), a chain (408), a chain wheel (408) and a square tube (408) composed of a chain rotation mechanism (408), and a material ejecting plate (409); The welding cross frame mechanism (5) comprises a position cylinder mounting seat (50), a slide rail slide block (51), a slide plate (52), a rocker arm (53), an electrode seat (54), an electrode (55), a rocker arm shaft (56), a rocker arm cover plate (57), a centering tooth block (58), a position cylinder (59) and a rocker arm cylinder (500); The welding lower chord rib mechanism (6) includes electrode two (60), electrode mounting seat (61), rocker arm three (62), rocker arm shaft three (63), rocker arm seat two (64), centering gear seat (65), centering rack (66), centering gear (68), rack limit bearing (69), rocker arm cylinder two (67), the welding lower chord rib mechanism (6) has two groups, is arranged at the both sides of steel bar truss (11) respectively, electrode two (60) is aligned with the lower chord rib of steel bar truss (11); The steel bar truss positioning mechanism (7) includes base panel (70), cylinder two (71), rocker arm shaft four (72), cylinder head push rod (73), rocker arm positioning block (75), balance auxiliary block (76), rocker arm shaft mounting plate (77), and base panel (70) and mounting plate (78) are fixedly connected; The welding upper chord rib mechanism (8) includes long sliding block sliding rail (81) fixed on gantry (80), large sliding plate (82), ball screw mounting seat one (83), servo motor mounting seat (84), servo motor two (85), ball screw sleeve two (86), welding arm sliding block (87), clamping arm mounting seat (88), centering sliding block sliding rail (89), rocker arm connecting rod (800), cylinder head sliding block (801), clamping cylinder one (802), transverse sliding rail sliding block (803), hook-shaped arm (804), clamping rocker arm one (805), fixed electrode mounting seat (806), fixed electrode (807), vertical rib centering block (808), rocker arm shaft five (809), rocker arm cover plate two (810), floating joint (811), welding cylinder (812), upper chord rib clamping electrode (813) and upper chord rib clamping electrode mounting seat (814); The steel bar truss feeding manipulator (9) includes mounting seat (91), drag chain slot (92), sliding rail (93), ball screw sleeve three (94), connecting rod (95), cylinder head push block (96), clamping cylinder two (97), cylinder mounting frame (98), sliding block four (99), clamping rocker arm two (100), servo motor three (101), ball screw mounting seat two (102), motor mounting seat (103).

2. A resistance welding machine for reinforcing truss end closures as claimed in claim 1 wherein, The above-mentioned mechanisms are linearly arranged on the rack (1) in the processing order, are hung above the rack by the steel bar feeding mechanism (2), the upper rocker arm clamping jaw (25) clamps the vertical steel bar (33) from the vertical rib rotating clamping cylinder (32), and is sent to the welding seat (401), electrode two (60) and fixed electrode (807) to complete the transfer process of each working procedure product;The function of the steel bar truss feeding manipulator (9) is to send the steel bar truss below the manipulator to the lower welding machine, and then pull out the welded steel bar truss (11).

3. A resistance welding machine for reinforcing truss end closures as claimed in claim 2 wherein, The mounting foot (20) is fixedly connected to the beam plate (21), and the whole component is installed on the table top of the rack (1) by the two mounting feet, so that the whole mechanism beam is suspended on the table top; the beam plate (21) is provided with a X-axis linear module composed of a slide rail and slide block set (22), a ball screw set (23), a slide block (24), a servo mounting plate (29) and a servo motor (28); the slide block (24) is fixedly connected with a rocker arm base (200), a rocker arm shaft (201), a rocker arm jaw (25), a centering block (202) and an eccentric shaft (203), and the upper end of the rocker arm jaw (25) is provided with a tension spring (26) and a cylinder (27), which control the opening and closing of the rocker arm jaw (25).

4. A resistance welding machine for reinforcing truss end closures as claimed in claim 3 wherein, The rotating cylinder mounting base (30) fixes the rotating clamping cylinder (32) on the table top of the frame (1), the output of the chain (37) of the feeding machine is opposite to the clamp mouth (31), the feeding groove (35) is in the shape of an inverted triangle, the bottom is provided with a top plate (301) and a pushing cylinder (303), the top plate (301) is connected to the feeding machine box (302) and the top plate (301) by the guide rod (39) and the sliding block (300) respectively; the feeding mechanism composed of the chain (37), the square tube (304), the chain wheel (305) and the motor (38) is fixedly connected above the feeding machine box (302), the top plate (301) is pushed by the pushing cylinder (303), the vertical steel bars (33) placed in the feeding groove (35) are pushed onto the chain (37), the top plate (301) and The receiving plate (36) the bottom plate (302) are inclined downward, and the vertical steel bars (33) on the top automatically roll down to the chain (37).

5. A resistance welding machine for reinforcing truss end closures as claimed in claim 4 wherein, The pushing cylinder (41) is installed at the bottom of the second feeding machine box (40), the top plate (409) is installed at the piston rod head of the pushing cylinder (41), the slide rod (43) and the slide block (42) are connected to the second feeding machine box (40) and the top plate (409) respectively, the feeding mechanism composed of the chain rotation mechanism (408) and the motor (405) is fixedly connected above the second feeding machine box (40), the receiving plate (410) is installed between the chain and the discharging groove (407), the second feeding machine box mounting block (406) is fixedly connected to the side of the second feeding machine box (40), and is used for connecting the feeding machine to the rack panel (44); the welding seat (401) is installed at a position opposite to the end of the chain at a distance, and the swing feeding mechanism composed of the slide table cylinder seat (45), the slide table cylinder (46), the rotary cylinder seat (403), the rotary cylinder (47), the rocker arm (48), the magnetic suction head (49) and the magnet (400) is used for sucking the horizontal rib on the chain (2), rotating 180 degrees and placing it on the welding seat, wherein the slide table cylinder (46) is installed on the slide table cylinder seat (45), the rotary cylinder seat (403) is installed on the slide table cylinder (46), the rotary cylinder (47) is installed on the rotary cylinder seat (403), the rocker arm (48) is installed on the rotary cylinder (47), the magnetic suction head (49) is installed on the rocker arm (48), and the magnet (400) is embedded in the magnetic suction head (49).

6. A steel truss head electric resistance welder as claimed in claim 5 wherein, The position cylinder mounting seat (50) is installed on the desktop panel side of the frame (1), the slide rail slider (51) is installed on the desktop panel, the slide plate (52) is installed on the slider, the rocker shaft two (56) is embedded on the slide plate (52), two rocker arms two (53) are symmetrically installed on the rocker shaft two (56), two centering tooth blocks (58) are respectively fixedly welded on the two rocker arms two (53), the rocker cover plate one (57) is attached on the upper surface of the rocker arm two (53), the two rocker shafts two (56) are pulled from the upper end, the electrode seat (54) is installed at the front end of the rocker arm two (53), two electrodes one (55) are respectively installed on the two electrode seats (54), the position cylinder (59) is installed on the position cylinder mounting seat (50), and the piston rod head is fixedly connected with the slide plate (52); the rocker arm cylinder one (500) is installed at the rear end of the rocker arm two (53).

7. A steel truss head electric resistance welder as claimed in claim 6 wherein, The rocker seat two (64) is composed of two parallel plates with rocker shaft three (63) holes welded on the mounting plate, and the rocker three (62) is installed in the middle of the two plates. The centering mechanism is fixedly connected with the rocker seat two (64) through the centering gear seat (65), the centering gear (68) is installed on the centering gear seat (65), the centering rack (66) is rotatably connected at both ends of the two rocker threes (62), one end of each of the two centering racks faces the centering gear (68), and the tooth surface of the centering rack is coupled with the centering gear (68), the rack limiting bearing (69) is installed on the outer side of the centering rack (66), so that the coupling of the centering gear (68) and the centering rack (66) cannot be separated; the front ends of the two rocker threes (62) are respectively provided with two electrode mounting seats (61), and two electrodes two (60) are respectively installed on the electrode mounting seats (61); the rear end of the rocker is provided with the rocker arm cylinder two (67), so as to provide clamping force for welding; meanwhile, there are two groups of welding chord mechanisms installed on the two sides of the steel bar truss (11).

8. A resistance welding machine for reinforcing bar channel end closures as claimed in claim 7 wherein, The base panel (70) and the mounting plate (78) are fixedly connected, the cylinder two (71) is installed upside down on the base panel (70), two rocker shaft mounting plates (77) are installed on the left and right sides of the cylinder two (71), two rocker shafts four (72) are installed at the lower corners of the rocker shaft mounting plates (77), the cylinder head push rod (73) is installed on the piston rod head of the cylinder two (71), the rocker positioning block (75) and the balance auxiliary block (76) are fixedly welded with the rocker shaft four (72), the fork head of the rocker positioning block (75) and the balance auxiliary block (76) is clamped on the cylinder head push rod (73), and the action of the cylinder two (71) controls the opening and closing of the rocker positioning block (75). The gantry (80) is provided with a long sliding block sliding rail (81), a large sliding plate (82) is installed on the sliding block, a servo motor mounting seat (84) and a ball screw mounting seat one (83) are sequentially installed at the uppermost end of the gantry (80); a servo motor two (85) is installed on the servo motor mounting seat (84) at the uppermost end, a ball screw sleeve two (86) and the servo motor two (85) are connected to form a Y-axis driving system, the large sliding plate (82) is fixedly connected with a ball screw nut in the ball screw sleeve two (86), so that the servo motor two (85) controls the up-down movement of the large sliding plate (82), a hook-shaped arm (804) and a welding cylinder (812) are fixedly connected on the large sliding plate (82), a welding arm sliding block (87) is movably connected with the hook-shaped arm (804) through the butt joint installation of a transverse sliding rail sliding block (803), and two ends of a floating joint (811) are connected with the welding arm sliding block (87) and a piston rod head of the welding cylinder (812); a clamping arm mounting seat (88) is fixedly connected with the welding arm sliding block (87), a rocker shaft five (809), a clamping cylinder one (802) and a centering sliding block sliding rail (89) are sequentially installed on the clamping arm mounting seat (88) from bottom to top, a cylinder head sliding block (801) is fixedly connected with a sliding block in the centering sliding block sliding rail (89), two clamping rocker arms one (805) are installed on the two rocker shaft fives (809) and are located on the two sides of the cylinder head sliding block (801) with heads upward, and a rocker connecting rod (800) has two ends connected with the clamping rocker arm one (805) and the cylinder head sliding block (801); a rocker cover two (810) is installed at the front end of the rocker shaft five (809) to cover the clamping rocker arm one (805), a fixed electrode mounting seat (806), a fixed electrode (807) and a vertical rib centering block (808) are sequentially stacked and installed at the hook-shaped end of the hook-shaped arm (804); an upper chord rib clamping electrode (813) and an upper chord rib clamping electrode mounting seat (814) are sequentially installed at the lower end of the clamping rocker arm one (805).

9. A steel reinforced truss head electric resistance welder as claimed in claim 8 wherein, The mounting seat (91) is provided with a drag chain slot (92) and a slide rail (93); a ball screw sleeve three (94) is located between the two slide rails (93), and both ends are installed between the mounting seat (91) and a ball screw mounting seat two (102); the ball screw mounting seat two (102) is installed at the front end of the slide rail (93); a motor mounting seat (103) is installed below the front end of the drag chain slot (92); a servo motor three (101) is installed on the motor mounting seat (103) and connected with the ball screw sleeve three (94) through a matched connecting shaft and a ball screw sleeve; a sliding block four (99) is installed on the two slide rails (93), and a ball screw passes through the middle of the sliding block four (99); the sliding block four (99) is provided with a cylinder mounting bracket (98) on the upper portion; the cylinder mounting bracket (98) is provided with a clamping cylinder two (97) on the upper end; the piston rod head of the clamping cylinder two (97) is provided with a cylinder head push block (96); the lower portion of the sliding block four (99) is provided with two clamping rocker arms two (100), which are respectively located on both sides of the sliding block four (99), and a half-toothed gear is arranged between the two clamping rocker arms two (100) and is in meshing engagement for centering; a connecting rod (95) composed of a rod end joint bearing and a screw rod is connected with the cylinder head push block (96) and the clamping rocker arm two (100) at both ends, and there is a set of connecting rod on each side of the sliding block; The discharge electrodes of the transformer (14) are connected with two electrode one (55) in the welding cross mechanism (5), two electrode two (60) in the welding lower chord mechanism (6), fixed electrode (807) in the welding upper chord mechanism (8) and upper chord clamping electrode (813), respectively, in the working process, the discharge welding of each mechanism is connected with the transformer (14) for discharge welding; the difference is that the electrodes are pressed to form a loop for discharge welding when it is the turn of the mechanism to work, and the electrodes of the mechanism not in turn are in an open state and do not form a loop, so no welding is performed; all electrodes and electrode mounting seats of the machine and the connected soft and hard copper belts are insulated from the rack, and insulation is achieved through insulating pads, insulating sleeves and suspended installation.

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