CN1065163C - Suspension type spot welding machine with transformer - Google Patents

Abstract

The invention provides a labor transformer suspension spot welding machine, which is mainly composed of a welding transformer, a welding tongs, a pneumatic transmission system, a cooling water system, a rotary device and a control box. The electrode arm and the secondary side of the welding transformer are double-connected, and the large-flow cooling water system can fully cool the welding transformer and the electrode. Suitable for automobile tractors, shipbuilding and construction industries. It is characterized in that the secondary winding of the welding transformer is formed by stacking no less than three layers of hierarchical tubes, the material of the secondary copper tube is red copper, and the cross-sectional shape is a square tube or a rectangular tube. The secondary copper pipe is cooled by water through the cooling water system to take away the heat, which can double the efficiency.

Description

Hanging spot welding machine with transformer

The invention relates to a suspended spot welding machine with a transformer, which is composed of a welding transformer, a pneumatic transmission system, a water cooling system, a welding tongs, a rotary device and a control box, and is especially suitable for welding that cannot be welded or is inconvenient to be welded by a general fixed spot welder Mild steel workpieces.

Among the known technologies, the "DN ₃ series suspension spot welding machine" produced by Chengdu Electric Welding Machine Factory is a typical product widely used in China. It is mainly composed of welding transformers, gas-hydraulic or pneumatic transmission systems, It consists of cables, welding tongs, control box, and balancer. Its disadvantages are high energy consumption, large and heavy volume, inflexible operation, and inconvenient use. In addition, there is also a known welding torch, which is the series of products produced by the French "ARO" company. Its main components include welding tongs, water cooling systems, welding transformers, cylinders, and gyro suspensions. The inner diameter of the secondary water-through cable is small, and the flow of cooling water is insufficient, resulting in a rapid temperature rise of the welding transformer. The cooling water used must be softened, otherwise the scale will block the inner hole of the transformer's secondary water-through cable and lead to the welding machine. It can't work normally, and even cause the transformer to burn out. Its upper welding tongs are vertically installed on the upper supporting arm, and its upper end is easy to contact the workpiece to be welded to form a current shunt, which not only affects the welding quality, but also greatly restricts the parts that can be welded. The electrode rod of the welding tongs and the secondary of the transformer are flexibly connected by copper sheets. The contact surface of the connection is small and the resistance is large. When the distance between the welding spot of the workpiece to be welded and the edge of the workpiece is lengthened and the welding margin is increased, the current reduction is obvious, and the welding The ability is reduced, and it cannot even be welded normally. The gyro suspension frame is fixed on one side of the spot welding machine. When hanging, the spot welding machine is in a tilted state, and the worker must hold it upright. It not only brings inconvenience to the operation, but also consumes the physical strength of the workers. The horizontal plane rotation (around the Z axis) is completely dependent on the sling to achieve flexible rotation. It is not safe and flexible to twist the sling during work.

The object of the present invention is to provide a suspension type spot welding machine with a transformer which has high efficiency, saves energy, and can realize welding of multi-layer thin steel plates without an inner tube oil-cooled transformer and takes away heat through a water cooling system.

The object of the present invention can be achieved through the following measures: the spot welding machine is made of a welding transformer, a pneumatic transmission device, a welding tongs, a cooling water system, a rotary device and a control box, and its special feature is that the secondary winding of the welding transformer consists of different Less than three layers of hierarchical tubes 57 are stacked, and the material of the secondary copper tubes is red copper, and the cross-sectional shape is a square tube or a rectangular tube.

The descriptions of the attached drawings are as follows:

Fig. 1 is the front view of the hanging spot welding machine with transformer;

Fig. 2 is the top view of the suspension type spot welding machine with transformer;

Fig. 3 is the assembly schematic diagram of electrode arm;

Fig. 4 is the A-A sectional view of electrode arm;

Figure 5 is a perspective view of the pneumatic transmission system;

Fig. 6 is the I direction view of pneumatic transmission system;

Figure 7 is a schematic diagram of the shape of a welded transformer silicon steel sheet;

Fig. 8 is the front view of the secondary coil of the welding transformer;

Fig. 9 is a B-B sectional view of the secondary coil of the welding transformer;

Fig. 10 is a C-C sectional view of the secondary coil of the welding transformer;

Figure 11 is a front view of the welding transformer;

Figure 12 is a top view of the welding transformer;

Fig. 13 is the front view of turning device;

Figure 14 is a side view of the swivel device.

Below in conjunction with accompanying drawing for further detail:

Fig. 1 and Fig. 2 have described the overall structure of band transformer suspension type spot welding machine, and the other end of the upper electrode arm 10 that one end is equipped with electrode 12 and conical sleeve 11 is fixedly installed on the rocking arm 9, and one end of lower electrode arm 13 Also equipped with electrode 12 and tapered sleeve 11, its other end is fixedly mounted on the support arm 14, the rocker arm is connected and fixed on the support arm 14 through the mandrel 21, the rocker arm 9 can rotate around the mandrel 21, and the upper and lower electrodes , upper and lower electrode arms, rocking arms and supporting arms constitute welding tongs, and the manufacturing materials of the rocking arms and supporting arms are aluminum alloys, and engineering plastics are also available. The welding transformer 5 is sandwiched between the welding tongs and the cylinder seat 25 of the film cylinder 3, and is fastened by a pair of pull rod nuts 4, pull rods 8 and 22, and the pull rods 8 and 22 are both water outlet pipes and water inlet pipes. Pipe nozzle 15 and a pair of pipe nozzle 18 are assembled on the two ends of pull rod 8 and pull rod 22 with the method of screw connection, have played the effect of nut. Connect by connecting pipe 16 between the pipe nozzle 15 of water inlet pull rod 22 and the tee joint 20, connect water inlet hose 23 on the tee joint, between the pipe nozzle 15 of water outlet pull bar 8 and the tee joint 20 by The connecting pipe 16 is connected, and the water outlet hose 24 is connected on the tee joint on one side of the water outlet pull rod. Slewing device 7 is installed in the center of gravity position of this machine. Handle 1 is installed on the back cover of film cylinder 3, and the power switch 2 of push-button formula is contained in the inboard of handle, connects intake pipe 28 below the film cylinder back cover. One end of the connecting rod 17 is hinged with the shaft 27 of the rocker arm 9, so that the pressure of the cylinder and the spring is transmitted through the connecting rod 17 to realize the cycle process of spot welding. The welding tongs, welding transformer and film cylinder are assembled sequentially along the same axis of.

Fig. 3 is the assembly schematic diagram of electrode arm, and Fig. 4 is the A-A sectional view of electrode arm, and electrode plate 31 profile is cuboid, and a circular hole is opened in the center, and the aperture of this circular hole is equal to the outer circle of electrode arm, in one of electrode plate Open a through slot in the center of the surface, use the round hole in the center of the electrode plate to fit it on one end of the electrode arm to keep the end face flat, and tighten the screw 37. Since the electrode plate has a through slot, the electrode plate is firmly attached to the electrode arm. On the top, the conductive sheet 32 connected to the secondary side of the welding transformer is neatly stacked on the end faces of the electrode plate and the electrode arm, and fixed with the pressure plate 38, screws 34 and four screws 33. This assembly method realizes double connection and increases the conductivity. The cross section reduces the contact resistance, so the welding capacity is increased under the same capacity. The electrode 12 is set in the inner hole of the conical sleeve 11, and the conical sleeve 11 with a conical surface is pressed on the cone of the electrode arm 10. In the hole, a circular through hole is opened on the electrode arm along its axis, and a cooling water conduit 29 is installed in this through hole. One end of the cooling water conduit to the electrode has a slope, and the other end is fixed on the plug 30, and the plug 30 There is a blind hole in the center, and the blind hole communicates with the threaded hole on the cooling water conduit and the electrode arm. The water pipe joint 35 is installed on this threaded hole. The inner diameter of the cooling water conduit is not less than φ4mm. The annular space of the inner diameter of the arm is the cooling water return channel, and the water outlet pipe joint 36 is installed on another threaded hole on the electrode arm. The manufacturing materials of the electrode arm, the electrode and the tapered sleeve are copper-zirconium alloy or brass, and the electrode plate, The material of the conductive sheet is red copper.

Fig. 5 is the perspective view of pneumatic transmission system, and Fig. 6 is the I direction view of pneumatic transmission system, and this system is made up of two parts, and the one, film cylinder, the 2nd, connecting rod. The film 41 of the film cylinder is sandwiched between the cylinder head 40 and the cylinder block 25. The film is made of rubber, and the middle is sandwiched with multiple layers of nylon embedded hair. It is connected by a plurality of screws 39 along the circumference of the cylinder. The two sides of circular splint 56 and pressing plate 42 are equipped with, connect with screw 44, and pressing plate and film are concentric, a push plate 43 is adorned at the center of splint 56, and lever 19 is fixed on the cylinder block 25 by mandrel 47, and the lever One end is connected bearing 45 by mandrel 46, and bearing is tangent to push plate, and the tangent position is just in the center of cylinder, and the other end of lever links to each other with fixed rod 48 by axle 26. The straight connection of fixed rod 48, spring seat 49, spring 50, stop block 51, bolt barrel 52, bolt handle 53, moving rod 54, joint 55 constitutes connecting rod 17 shown in Fig. 1 . The shape of the bolt cylinder 52 is the same cylinder, and a trapezoidal inner hole is opened on the coaxial line of the outer circle of the bolt cylinder. The hole towards the end of the spring 50 is small. This end is connected with the fixed rod 48 through the shaft 26, and the stopper 51 is screwed and fixed On the fixed rod 48, it can adjust the pressure of the spring through the thread. The spring 50 is sleeved on the fixed rod 48 between the spring seat 49 and the stopper 51. In the middle of the bolt cylinder, there is a section of through groove, and the through groove is opened in the axial direction. One section, then, turn 90° and open radially, the length of the radial through groove is equivalent to 1/4 of the outer circumference, shaped like the bolt groove of a rifle, the bolt handle 53 passes through the through groove on the bolt barrel and is fixed on the moving rod 54 On, the diameter of the part of the moving rod inside the bolt barrel matches the inner hole of the bolt barrel. Its other end is connected with the joint 55, and the joint and the rocker arm are connected through the mandrel 21. The connecting rod has two functions. When the bolt handle is at position a, the air in the cylinder is blown up, and the push plate is against the The bearing makes the lever at this end move forward, while the other end of the lever moves backward, and the rocker arm is moved backward through the connecting rod. The upper and lower electrodes are closed, the spring is compressed, and after the gas is stopped, the spring is restored, and the two electrodes are opened, thus realizing welding. When the bolt handle is at position b, push the rocker arm forward to expand the distance between the two electrodes. The maximum distance between the two electrodes is 6-10 times the normal working distance, which brings convenience to the welding work.

Figure 7 is a schematic diagram of the shape of the silicon steel sheet for welding transformers. The shape of the silicon steel sheet is like an "F" shape, and the angle a is 110°-120°. Two symmetrically combined, called a group of silicon steel sheets, each group of silicon steel sheets The corners of the steel sheets are rounded, and two symmetrically connected round holes of equal diameter are made on each sheet, and through grooves are made symmetrically from the round holes to the edge of the silicon steel sheet. The groove width is not less than 1.5mm, and the angle a It brings great convenience to the assembly of the transformer. As long as it is inserted along the hypotenuse of angle a, the assembly work is much easier. The complete symmetry of the silicon steel sheet saves the mold for punching the silicon steel sheet.

Figure 8 is the front view of the secondary coil of the welding transformer, Figure 9 is the B-B sectional view of the front view of the welding transformer secondary coil, and Figure 10 is its C-C sectional view, the secondary copper tube 57 is bent into a "U" shape, and multiple secondary The copper tubes are stacked in sequence, and the number of stacked secondary copper tubes is not less than 3. The inner and outer surfaces are packed with 60 inner flat copper wires and 58 outer flat copper wires. The secondary copper tubes are square with an inner diameter of 6×6mm-8 ×8mm, the inner and outer flat copper wires and secondary copper tubes are assembled by welding to form a secondary coil, which is welded on the conductive block 59. The conductive block is a cuboid, and on the conductive block at the corresponding position where the secondary copper tube is assembled, A water channel is made, which communicates with the secondary copper pipe. There is the same threaded hole on the 90° side of the water channel. The threaded hole is connected to the cold water pipe, the flat copper wire, the secondary copper pipe, and the material of the conductive block. For copper.

Fig. 11 is a front view of a welding transformer, and Fig. 12 is a top view of a welding transformer. The secondary coil 61 is sandwiched between the primary coils 62, and the number of turns of the primary coils on both sides of the secondary coil is equal. Multiple groups of silicon steel sheets are inserted symmetrically on both sides of the coil, and four screw rods 66 penetrate into the through holes at the four corners of each group of silicon steel sheets, and are fastened with nuts 65 to form a transformer core 63. Four linear grooves 67 are formed behind the transformer iron core, thereby improving the magnetic circuit, preventing magnetic saturation, and reducing magnetic eddy currents. The bottom surface of the conductive block 59 of the secondary coil 61 is connected to the conductive sheet 32 through a screw 64 and a pressing plate 69, and the conductive sheet The other end of the wire connects with the electrode arm, and the lead wire 68 of the primary coil leads the other end of the conductive sheet at the secondary coil.

Fig. 13 is a front view of the slewing device, and Fig. 14 is a side view of the slewing device. The moving ring 73 is circular in shape, with a rectangular through hole and four circular through holes in the middle. These four circular through holes have two apertures each. Equal and symmetrical to the Z-axis, the outer circular end face of the moving ring has a circular groove with a radius matching the ball 78 along the entire circumference, and the fixed ring 72 is circular, and has a radius and a groove along the entire circumference of the inner circular end face of the fixed ring. Balls are matched with the circular grooves, and a plurality of balls 78 are placed in the circular grooves between the moving ring and the fixed ring. The two are connected by balls and can rotate with each other. The shaft pins 74 are respectively inserted into the holes of the fixed ring on the Y-Y axis of the horizontal centerline, and the integrated moving ring and the fixed ring can rotate around the Y-Y axis. The lower end of the suspension tube 74 has a fork-shaped clamp, and the boom 71 is inserted into the fork-shaped clamp. Head, fixes with screw 77, puts into suspension ring 70 in the suspension tube, press-fits plane thrust bearing 76, and the stopper end seals capping cover 75, because the interior plane thrust bearing, whole slewing device can rotate around the Z-Z axis. Through the square hole on the moving ring in the slewing device is set at the center of gravity of the spot welding machine body, and then combined with attached drawings 1 and 2, it can be clearly seen that this slewing device enables the spot welding machine to realize The X-X axis rotates 360° in two directions, the Y-Y axis rotates in both directions 90°, and the Z-Z axis rotates in both directions 360°, so that the machine can perform all-round welding.

The control box is mainly composed of printed circuit board, digital integrated circuit, thyristor trigger pulse transformer, digital counter and shell. Its main purpose is to ensure the various processes of the spot welding machine: ", "Pause" automatic cycle.

The present invention has following advantage over prior art:

1. Since the electrode arm adopts the technical measure of double connection, the contact resistance is reduced, and the transformer iron core is formed with four square linear grooves to reduce the electromagnetic eddy current. The welding thickness of the technology is larger, and it has obvious energy-saving effect. At the same time, the welding tongs can have sufficient length without changing the welding capacity, which undoubtedly increases the accessibility of welding work;

2. Since the diameter of the secondary copper tube does not use the inner tube oil cooling and heat dissipation device, but passes through the cooling water system to cool the heat away, so that the passing current can be increased by 4 to 5 times. In addition, the water passage section of the cooling water pipe in the electrode arm is enlarged, enough cooling water passes through, and the cooling is sufficient, which ensures the normal operation of the transformer and the electrode for a long time, the interval between continuous spot welding is short, and the use efficiency is high. The formation of scale is extremely slow, the service life of the welding machine is long, and the failure rate is low;

3. The cooling water does not need to be treated, and no water filter is installed;

4. The all-round rotary device makes the spot welding machine flexible and easy to use.

Claims (1)

1. A hanging spot welding machine with a transformer, which is composed of a welding transformer, a pneumatic transmission device, a welding tongs, a cooling water system, a rotary device and a control box, and is characterized in that the secondary winding of the welding transformer consists of no less than 3 layers of tubes ( 57) It is formed by stacking, the material of the secondary copper tube is red copper, and the cross-sectional shape is a square tube or a rectangular tube.

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