SU1590271A1 - Welding device for machine for resistance welding - Google Patents

Abstract

The invention relates to welding and is intended for use in resistance welding equipment (spot, seam). The purpose of the invention is to simplify the design, increase reliability and maintainability, as well as reduce reactive losses at low power levels and device mass. The device consists of two rods, primary winding sections of a welding transformer, a flexible bus, two electrodes, a single-phase thyristor contactor and a controller. The primary winding of the welding transformer is made in the form of structurally complete toroidal sections mounted on one or on two rods. The rods are made of electrically conductive material and are the secondary winding of the welding transformer. On the one hand, they are shorted by a flexible conductive bus, on the other hand, they are terminated by the attachment elements of the electrodes. Sections of primary winding are easily removable. The number of them is collected depending on the required power level. 2 Il.

Description

one

(21) 4436967 / 25-27

(22) 07.06.88

(46) 07.09.90. Bksh. Number 33

(71) Kovelsky flood of agricultural machines of them. 50 years of the USSR, Kovselselmash

(72) L.F. Nikolaev

(53) 621.791.75 (088.8)

(56) Proch L.Ts., Shmakov B.M., Yavorsk N.M. Handbook of welding equipment. Kiev: Technique, 1978, p. 74 - 75.

(54) WELDING MACHINE DEVICE FOR CONTACT CBAPJKH

(57) The invention relates to pile: pk and is intended for use in resistance welding equipment (spot, seam). The purpose of the invention is to simplify the construction, increase reliability and maintainability, as well as reduce reactive losses at low power levels and device mass. The device consists of two rods, sections of the primary winding of the welding transformer, a flexible busbar, two electrodes, a single-phase thyristor contactor and a controller. The primary - o6MOTKia welding transformer is made in the form of structurally complete toroidal sections mounted on one or on two rods. The rods are made of electrically conductive material and are the secondary winding of the welding transformer. On the one hand, they are shorted by a flexible conductive bus, and on the other hand, they end with fastening elements of the electrodes. Sections of primary winding are easily removable. The number of them is collected depending on the required power level. 2 Il.

with s

(L

The invention relates to welding and is intended for use in resistance welding equipment (spot, seam).

The purpose of the invention is to simplify the design, increase reliability and maintainability, as well as reduce reactive losses at low power levels and weight of the device.

FIG. 1 shows schematically the structure of a power unit of a welding device; in fig. 2 - the welding circuit is functional.

The device consists of two rods 1 and 2 with high electrical conductivity, which are attached to section 3 of the primary winding of the welding transformer, flexible bus 4 ,. connecting non-working ends of rods 1 and 2, two electrodes 5, mounted on opposite (working) ends of rods, single-phase thyristor contactor 6 connected in series with the primary winding of a welding transformer and controller 7 connected to a type 1 contactor contactor 6. With Delju

Yu

simplifying graphic materials, the mechanism for clamping the electrodes 5 and the fastening elements of the electrodes 5 are not shown, the welding controller is depicted as a phase regulator.

The device works as follows.

When connected to an AC mains parallel connected section 3 of the primary winding of the welding transformer between the open electrodes, the emf is equal to the sum of the emf induced on the gridons 1 and 2 each of sections 3. The emf is required and, therefore, the power level is chosen by installing a specific the number of easily detachable sections 3. The smooth adjustment of the welding current is carried out by means of a thyristor contactor 6 connected by a control input to the controller 7. The lower rod 2 is rigidly fixed on the frame of the machine for Resistance welding, the upper one has a rotational degree of freedom (shown by arrows in FIG. 2), necessary for clamping the parts to be welded between the electrodes 5.

To ensure the normal operation of the device, it is necessary that all located on rod 2 (rods 1 and 2) of section 3 are connected. Otherwise, the inductance of the secondary circuit increases dramatically, which leads to a decrease in the welding current and an increase in reactive losses. The windings 3 are wound on toroidal magnetic cores. The need for water cooling of rods 1 and 2 is determined by thermal calculation in the process of design processing of the claimed device.

Compared with the known device, the simplified design of the proposed device is achieved by reducing the number of sizes of parts and assembly units of the power unit. Increased reliability is achieved due to the absence of thin-walled water-cooled secondary turns of the welding transformer. During operation, secondary coils fail due to clogging or loss of tightness of the cooling channels. The latter leads to the impregnation of the primary winding with water and its breakdown. The device has no thin-walled

water cooled elements of the secondary circuit. The increase in maintainability is obvious - the primary windings of the welding transformer are easily removable. Replacing outdated sections of a device is made much faster than repairing or at least replacing a welding transformer of a known device. The weight reduction of the device is achieved due to the exclusion of independent secondary turns and in terms of the specific power of the welding transformer (the latter at the toroidal transformers, the mators are higher than W-like). In addition, the mass of the device decreases as the Power level of the welding transformer decreases, as the number of primary winding sections used decreases. The reduction of reactive losses at lower power levels is due to the fact that the device does not have a power level switch, which is a switch for the number of turns of the primary winding of the welding transformer in the known. The power level of the welding transformer of the proposed device is determined by the number of primary winding sections connected in parallel with each other. At the same time, cos y practically does not depend on the number of installed sections.

Formula

and 3

gaining

A welding machine for resistance welding, containing a welding transformer, a contactor, a controller, two current-carrying rods, a flexible bus and two electrodes, characterized in that, in order to simplify the design, increase reliability and maintainability, and also reduce reactive losses at lower levels power and weight reduction, the primary winding of the welding transformer is made of identical toroidal sections, connected in parallel with each other, the secondary winding is made in the form of current-conducting rods mainly round section, with one or both of the rods wearing the primary winding section, the axis of the rods are located in the same plane, and the non-working ends of the rods are connected by a flexible bus.

380

FIG. 2

Claims (1)

Claim The welding device of a resistance welding machine, comprising a welding transformer, a contactor, a controller, two current-carrying rods, a flexible busbar and two electrodes, characterized in that, in order to simplify the design, increase reliability and maintainability, as well as reduce reactive losses at lower power levels and weight reduction, the primary winding of the welding transformer is made of identical toroidal sections connected in parallel with each other, the secondary winding is made in the form of current-carrying rods of circular cross section, with sections of the primary winding being worn on one or both rods, the axis of the rods are in the same plane, the inactive ends of the rods are connected by a flexible bus. Fie. 7 • 1590271 ΦΖΛ? .2