SU418294A1 - DEVICE FOR ELECTROCONTACT SOLID ITEMS - Google Patents

Description

one

The invention relates to soldering, in particular, to the design of a device for electrocontact soldering of products, mainly leads to a collector and emitter of silicon alloyed transistors.

A device for soldering is known, comprising a housing, an electrode holder with electrodes, a mechanism for pressing the electrodes against the parts to be joined, which interacts with a copier.

The purpose of the invention is to increase the accuracy of alignment of the parts being joined.

For this, in the proposed device, the electrode pressing mechanism is made in the form of two spring-loaded sliders fixed on the body, one of which has a T-shaped head, in the slots of which two electrode holders with electrodes are installed with the possibility of rolling, and the other slide is made in the form of a two-prong plug, pressing through leverage system leads to the collector and the emitter when interacting with a copier made three-tooth.

The drawing shows the proposed device, where in FIG. 1 - device for electric soldering; in fig. 2 - scheme of simultaneous electric soldering of leads to the collector and emitter.

The device for electric soldering of leads to the collector and emitter of silicon alloyed transistors on assembly machines (Fig. 1) is made in the form of a case 1 for fixing an automatic machine, controlling a slider 2 on the table for a slider stop with holders of clamps and fixing the case, a three-tooth copier 3 to rotate the holders of the contact electrodes and clamp the crystal holder; spring 4 to return the control slider down to the original

a position, a slider 5 for fastening the electrode holders, a spring 6 for lifting the slider, a screw 7 on the plate 8 for adjusting the stroke height of the slider, the electrode holders 9 for fastening on the axles x 10,

And-clamp electrodes for centering the leads across the collector and the emitter and contacting the leads; springs 12 for clamping the soldered leads with clamping electrodes on the collector and emitter, holders of contact electrodes 13 for fixing mandrels 14 on insulating sleeves 15 for centering contact electrodes on the collector and emitter, contact electrodes 16 for providing contact to the collector and emitter;

axes 17 for securing the contact electrode holders to the collector and the emitter; clamping the retainer of the crystal holders 19 to center the assembled reinforcement along the soldering electrodes, the lever 20 for securing

two microswitches 21 for switching

electric circuit of soldering in the presence of assembled fittings at the position of soldering; axis 22 for securing the clamping of the crystal holder and the lever to the housing; springs 23 for removal of the clamping of the crystal holder; stops 24 for centering the pressing of the crystal holder. A leg 25 fixed in an automaton carousel (not shown) is assembled with an armature block and an emitter terminal, one end of which is welded to the leg pin, the other is soldered to the emitter, and a collector pin, one end of which is also welded to the corresponding leg pin, another is attached to the collector.

By pressing the contact electrodes to the collector and the emitter, the current is turned on and the bent pins of the leg and the collector parts and the emitter, which are enclosed between pairs of soldering electrodes, are heated. Then, the current is turned off, after cooling of the heating places, the leads are fixed at the ends of the collector and the emitter, and the electrodes of the device move to their original position.

Device for soldering pins works as follows. The leg 25 prepared for electric soldering is brought to the electric soldering position. The device is at this time in the initial position, i.e. the control slide 2 with the spring 4 is retracted by the cam-lever mechanism of the automaton (not shown) to the extreme lower position. The slider 5 is also folded down with the plug of the control slider, the spring 6 is compressed, the electrode holders 9 are pressed against the stops 26, the contact electrodes 16 and the clamp holder of the crystal holder 19 are retracted.

When the control slider 22 moves upward from the three-tooth copier 3, the lever 20 rotates, the supply clamp-latch of the crystal holder 19 by abutments 24 for centering the crystal holder, after contact with which the contacts of two microswitches 21 are closed. When there is no position of the assembled reinforcement, the electrical circuit remains open .

Together with the control slider 2 from the spring 6, the slider 5 rises up to the stop against the screw 7, while the clamping electrodes 11 approach the leg terminals and lift them up until the bent ends touch the ends of the collector and the emitter. Then, the plug of the control slide 2 with the stops 26 moves upwards from the slide 5 and the axles 10 of the electrode holders 9 are rotated from the springs 12; at the same time the electrodes-clamps 11, moving to the center, press the bent ends of the legs of the instrument to the ends of the collector and the emitter. Upon further movement of the control slider 2 with the trident cam 3, the holders of the contact electrodes 13 turn up from the springs 18, and the contact electrodes 16 come up and press against the collector and the emitter. A microswitch (not shown) operates from the cam mounted on the distributor shaft of the automaton, and the current flowing in the secondary windings of low-power transformers heats the output and parts of the collector and emitter between the bunks of the electrodes. At the same time, the electrode holders 9 of the clamping electrodes 11 from the springs 12 are displaced to the melted ends of the collector and the emitter, ensuring a reliable weld after the current is turned off and the surfaces being cooled cool down. Then the mechanisms go back to their original position.

Subject matter

A device for the electric contact soldering of products, mainly conclusions to the collector and emitter of silicon alloy transistors, comprising a case, electric-donor with electrodes, a mechanism for pressing the electrodes to the parts to be connected, interacting with a copier, characterized in that, in order to improve the accuracy of centering of the parts to be connected, the clamping mechanism of the electrodes is made in the form of two spring-loaded sliders mounted on the body, one of which has a T-shaped head, in which it is mounted with the possibility of tim electrode with two electrodes, and the other is designed as a slide fork dvuhzuboy, biasing terminals via a lever system to a collector and an emitter in contact with the cam formed drills.