SU1677721A1 - Demagnetization device - Google Patents

Abstract

The invention relates to demagnetizing devices, reduces the energy costs of demagnetization and simplifies the control circuit. A triac 4, connected in parallel to the second alternating voltage generator 3, is inserted into the device, the control electrode of which is connected to the output of the threshold element 7 through the one-vibrator 9 and the first differentiating circuit 8, and from the other side through the second differentiating circuit 10. with microcomputer. 2 Il.

Description

This invention relates to electrical engineering, more specifically to demagnetization devices.

The aim of the invention is to reduce the energy cost of demagnetization and simplify the control scheme.

FIG. 1 shows a functional diagram of the device; figure 2 - timing diagrams.

The device contains a demagnetization coil 1, the first 2 and second 3 alternating voltage generators, triac 4. The device is equipped with a resistor 5 connected to the input of the rectifier 6, the output of which is connected through the threshold element 7 and the first differentiating circuit 8 to the input of the one-shot 9, the output The one-shot 9 is connected to the control electrode of the symistor 4 and through the second differentiating circuit 10 to the microcomputer 11.

The device works as follows.

In the initial state, in the absence of a demagnetized product 12 in the coil 1

the current of the first alternating voltage generator 2 flows, while the triac 4 is open (the interval O ... ti, the plot IL of Fig.2).

When the demagnetized product 12 enters the zone of operation of coil 1, the inductance of the latter increases, the current in the coil decreases, the voltage on resistor 5 and on rectifier 6 decreases. When the voltage Ue at rectifier 6 output decreases to the set value A, the threshold is turned on element 7, by signal U from the output of which, through the first differentiating circuit 8, the one-shot 9 is triggered for the time required for complete demagnetization of the product (interval ti, .. t2 of figure 2). The impulse Ug from the one-shot 9 brings the triac 4 to the closed state, which leads to the inclusion of the second alternating voltage generator 3, producing a certain sequence of low-frequency alternating damped pulses, demagnetizing products (interval ti ... t2, plot IL, figure 2). In the far &

Yo

Os

VI

3

Yu

We intermittent signals Us. Uio from the output of the threshold element in the interval ti ... t2 does not affect the operation of the one-shot.

At the end of the one-shot pulse (the instant ta figure 2) the triac 4 is switched to the open state, the second alternating voltage generator 3 is turned off, and through the second differentiating circuit 10 to the input of the microcomputer control circuit, for example

the robotic complex, a signal is given that the degaussing process is complete. In such a state, the device will be in the time interval t2 ... ts (Fig. 2).

When product 12 leaves coil 1, the inductance of the latter decreases, and the current IL increases, the voltage on resistor 5 and output of rectifier 6 increases. As this voltage increases to a predetermined value, threshold element 7 turns off and the device returns to its original state.

The invention significantly reduces the energy costs of demagnetization of products, makes it easy to automate the control of the process of demagnetization of elements in the process flow.

Claims (1)

An inventive demagnetization device comprising a demagnetization coil connected in series, a first and a second voltage generator and a resistor with a rectifier connected in parallel with it, the output of which is connected to a threshold element, in order to reduce the demagnetization energy costs and to simplify the control circuit , the first differentiating circuit, the one-shot, the second differentiating circuit and the microcomputer, as well as the connected pa are additionally introduced into it parallel to the second alternating voltage generator, a triac whose control electrode is connected to the common junction point of the one-vibrator and the second differentiating circuit, and the input of the first differentiating circuit is connected to the output of the threshold element. Fig1 % Ug ju 2