SU854633A1 - Apparatus for automatic limiting of idle voltage of welding transformer - Google Patents

Description

(54) DEVICE FOR AUTOMATIC

LIMITATIONS OF VOLTAGE STANDING ATTITUDE OF THE TILTING TRANSFORMER

one

This invention relates to electrical engineering and is intended to limit the no-load voltage of a welded converter. There are known devices for bridging the idle run of a welded converter, comprising a misting transformer, a time relay and a rectifier whose input is connected to an inductor, and an output to the input of an intermediate relay whose contacts are included in the power supply circuit of time relay 1.

In these devices, the voltage on the winding of the time relay depends on the distance between the product to be welded and the electrode, and on the winding of the intermediate relay, on the voltage drop across the choke. Both of these parameters in the work process of the welding converter change, so it is not possible to achieve high reliability and sensitivity in the operation of the device.

Devices are also known that contain a time relay, two current relays, and a 1rans (} control armature 2.

The use of current relays in these devices reduces their reliability and sensitivity.

and requires, to ensure operability, a complementary winding superimposed on the power windings of the welding converter. This leads to additional costs under production conditions.

Also known are devices containing a converter, the input of which is connected via a switching element to a power source, and an output to a welding circuit, an executive element, a timing circuit, a transistor switch, a Schmitt trigger to an operational element 3.

The complicated design and adjustment methods of these devices do not allow their use in mass production.

The closest in technical essence and the achieved result to the proposed is a device containing a welding transducer, the input of which is connected via a switching element to the terminals of the supply voltage, and the output to the welding circuit, and an actuating element acting on the switching element and controlling the semi-semi-conductor switch 4.

3

This device does not provide the required level of shade due to the overlap on the input of the gyulg1r operation mode (pyu, gp of the first switch, it with the spindle element via tr: 1PS (5 Ormator tsl-i and

the need for the use of the winding of the transformer winding ysipaBJiein ;.

The purpose of the invention is vfOBbnucKHC regarding the operation of the device.

The goal is achieved by telg that the device for automatic restriction: e1 to idling the welding transducer, containing a welding transducer, the input of which is connected through the switching element to the terminal voltage, and the output to the welding terminal, and the terminal. ; p1b; 1 element, which later switches to switchgear (; mt and ironed switchboard switches), additionally; log in nd H (; In ds110chk "poluproiodpikosP through n) to the input ks1l mutptor ispog) of G1ntelno element, etsM output RCR-Heti04Kn through Lipeys-Hor soedshgon to control the electrode. sub-prolodic to approx. switch,

It is shown on the data sheet 11rdpts11.i1 and electrical device diagrams.

The device for the Apatomical safety device is 1S. I am on the same as the voltage of the SAROCHZ (th transducer C (keeps evil 1; -tg; conventional installation i switchboard; element 2. HC-chain 3, straightened. Bram.; Ada10D1у10 HC-1; epochka 5 with copdsatoro 6, ddstporor 7 and thyristor 8, transistor switch 9, executive power, 5ent 10, g X Unformagor 11 controls it, builder 12, e; strode 13 and welded iadelpe 14.

The device d) barely works ;; w105d 1-1 .; arr; 13th. In the condition of the state all evil -, - 5 circuits are de-energized ;. When accessing the capr): sec on the clamp of the device in an electrical welding device installation 1 via an RC power supply switch 3 of the power supply with the required voltage supplying the network. Hir glleshte at the output of installation 1 is 6-10 V. This voltage is converted, g 4, to the constant, smoothed and fed to the input of the device. At the same time, the transformer secondary windings {:: MTTORA 11 control panel is transformed into G Osto G-1 with rectifier 12, smoothed and fed to the device. The control pulse opens the thyristor 8 (forcing 1/5 capacitor in the diagram n shown). On the basic transition of the transistor cord 9, a control current flows. T} technologist key 9 OT: p vaets, ig / gpchu

Iskki entrance nntelno1o e; emen7a 10. The switching element 2 remains closed.

When the electrode 13 is closed with the product 14, the nanowire at the output of the welding unit 1 is O. The thyristor 8 and the transistor switch 9 for: are charged. Executive element 10 generates control pulses on K (y.11L) Troy and Element 2, which otkryshatsya. To the electric welding machine 1, a full nanowire is applied. The setting on the installation allowance 1 is 60U. B. This voltage is sufficient to excite D5. During the welding process, the voltage t of the output of the rectifier 4 is 20-50 V. The capacitor 6, the time of the driving RC-chain 5, is charged to the voltage measured by 5al; the voltage is 5 but not sufficient for the opening of the 7th Dipstick 7.

According to the oicoHuuiHH process of welding and extinguishing the arc and the output of the unit 1, the output is 60-70 V. The capacitor 6 is also recharged during dispatch, and the voltage equal to that of the distor 7, dynistor

7dkrystys. The capacitor 6 is discharged through the open (the dynistor 7,} one transition of the thyristor 8 and the basic transition of the transistor switch 9. The thyristor 8 opens, keeping the electrical detector 9 in the open state. The operating element 10 and the remote control element 2 are disconnected. the output of the plant is 6-10 V. CxcFvia returns to its original state.

The hallway is non-guided. All processes are repeated.

When using the device for welding: common: itlen and generators, a flash of 4 ds is used, In operation of the device together with a welding generator, a switching element 2 and an RC element 3 are connected to the primary side of the cell, the output of which is connected to the excitation circuit of the secondary generator.

The simple design and uniformity of the device allows it to be used for various types of electric welding equipment, X plants, Nromdlen, H) plants and construction sites. When using the BamiH devices, requirements are imposed that provide for the idle speed of the electrowelding plants or the output voltage equal to them and set to T1X values- The use of the device allows you to do more with energy saving, because the current flow of the transformers is 7 times. -10% of its nominal value. When the transformer is idling, the power factor of the installation is significantly reduced, which requires additional installation costs to compensate for their devices. Is

Claims (1)

Claim A device for automatically limiting the open circuit voltage of a welding transducer, comprising a welding transducer, the input of which is connected through a switching element to the supply voltage terminals, and the output to the welding circuit, and an actuating element acting on the switching element and controlled by a semiconductor switch, characterized in that, in order to increase the reliability of the device, an additional dinor, an RCR circuit, and a rectifier are introduced into it, moreover, the input of the rectifier is connected to the output welding converter, and an output - to the input of RCR-chain and through the semiconductor switch ₅ to the input of the actuating element, wherein the RCR-chain output through dynistor connected to the control electrode of the semiconductor switch.