SU1620245A1 - Apparatus for controlling resistance butt welding machine - Google Patents

Abstract

The invention relates to resistance welding and can be used on all resistance butt welding machines equipped with an upsetting electromagnet. The goal is to increase reliability by eliminating burning electromechanical contacts B, a device containing upsetting electromagnet 4, rectifier 6, and contact 3 including upsetting The ballast resistor is equipped with an electronic pulse former that consists of a thyristor 5, a delay node 1 and a phase shifter 2, which performs a similar function - reducing retention of the current through the electromagnet obmotkh precipitation relative current Burst Vani. 2 or so (L

Description

Shig.1

The invention relates to resistance butt welding and can be used on all resistance butt welding machines equipped with an upsetting electromagnet.

The aim of the invention is to increase the reliability of the welding machine by eliminating burning mechanical contacts.

FIG. 1 shows the scheme of the proposed control device; in fig. 2 - time diagrams of current and voltage.

The control unit diagram (Fig. 1) contains a delay unit 1, a phase shifter 2, a contact 3 for upsetting the precipitator;

Advantages of the device: for switching on a precipitating electromagnet, one contact of a programming device is sufficient; contacts of the programming device commute low-current circuit with an active load; the time interval required for the operation of the electromagnet is maintained automatically, after which the current decreases to the level of the holding current and the winding does not heat up.

All nodes of the proposed device are assembled from standard schemes: node 1 delay — an integrating RC-chain with a KT-3102 type transistor, phase-shifter: the body is made according to the relaxation circuit

nit 4 precipitations, thyristor 5, rectifier-45 generators on a single junction transistor bridge 6. of type CT, 117, thyristor of type K.U202, and FIG. 2 accept the following bridge bridge assembled on type diodes

values: a - voltage at the output Vy-D243.

direct bridge; b - voltage on the practical use of the device on

capacitor C1; c is the voltage across the emitter T2; d is the voltage across the resistor R4 and the control electrode of the thyristor 5; d - voltage on electromagnet 4 siege 20

welding machines type K-190, K-583

ki; e - current through the winding of the electromagnet.

The device is turned on by the command to turn on the draft by means of normally open contact 3 of the programming device (not shown). At the same time during the time t (Fig. 2); detectable circuit allows to exclude frequent failures of electromagnet precipitation due to overheating. Thus, the loss of working time for repairs and reduced productivity of machines.

25

Claims (1)

Invention Formula A butt welding machine control device containing a precipitating electromagnet, a rectifying bridge, konpyo Rl; C1, the transistor UT1 is closed and the angle of 30 closure of the precipitation, characterized by that, in order to increase the reliability of operation by eliminating burning mechanical contacts, a thyristor was inserted into it, a delay node and a phase shifter, the components of the driver of the thyristor 5 triggering cells and 5 are determined only by circuit R2; Sz (Fig. 2 g, d). The current in the winding of the electromagnet is maximum and corresponds to the response current, at this time the voltage on the capacitor C1 increases, and when it reaches the level of Ues (Fig. 2b), trans-pulses, while the output of the delay node, the UT1 transistor opens and connects the con- nected to the input of the phase shifter, the output  which is connected to the control electrode of the thyristor, in the anode circuit of which the precipitation electromagnet is connected, and the power supply circuit of the delay unit and the phase shifter through the normally open contact of the upsetting are connected to a rectifying bridge. capacitor C2 parallel to the capacitor C3, increasing the time constant of circuit R2; C2; Sz (Fig. 2 c). This increases the cut-off angle of the thyristor 5 (Fig. 2 d), the current through the electromagnet winding decreases to the level of the holding current (time t2). 40 Advantages of the device: for switching on a precipitating electromagnet, one contact of a programming device is sufficient; contacts of the programming device commute low-current circuit with an active load; the time interval required for the operation of the electromagnet is maintained automatically, after which the current decreases to the level of the holding current and the winding does not heat up. All nodes of the proposed device are assembled from standard schemes: node 1 delay — an integrating RC-chain with a KT-3102 type transistor, phase-shifter: the body is made according to the relaxation circuit Practical application of the device on welding machines type K-190, K-583 allows to exclude frequent failures of electromagnet precipitation due to overheating. Thus, the loss of working time for repairs and reduced productivity of machines. Invention Formula A butt welding machine control device comprising an upsetting electromagnet, a rectifying bridge, upsetting contact, characterized in that, in order to increase the reliability of work by eliminating the burning mechanical contacts, a thyristor, a delay unit and a phase shifter are included in it, which form the driver that starts them M i , -I 111 H l ft k IA A IA j i i to to k k k k k i i k k k k k FIG. 2