SU1497644A2 - Article demagnitizing device - Google Patents

Abstract

The invention relates to the control of the physical properties of ferromagnetic substances and can be used for automatic demagnetization of products. The aim of the invention is to increase the reliability of demagnetization. To achieve the goal, the device contains an alternating voltage source 1, a first switch 2, diodes 3 and 4, capacitors 5, 6, an electromagnet 7, a second switch 8, a time master unit 9, a start button 10, a null organ 11, a parity unit 12. In order to eliminate poor quality demagnetization of products, due to the fact that the quality of demagnetization of a product during one cycle of demagnetization may not reach the required level, the device is equipped with excitation unit 13, magnetically sensitive element 14, measuring amplifier 15, comparison unit 16, reference voltage source 17, third the key 18, which serves to control the magnitude of the residual magnetization of the product after the demagnetization cycle and in case of detection of poor quality demagnetization of the control supply device drove on a repeated demagnetization cycle. 1 il.

Description

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The drawing shows a functional diagram of the device.

The device contains a series-connected alternating voltage source 1, irepuhiii switch 2, two parallels; I) t, 1e values, each of which with (1 stands for series-connected diodes 3, A and capacitors 5 and 6, the diodes in which electromagnet 7, second key 8, connected between common points, a diode - a capacitor of each value, the time is 1: 1 unit 9, connected by the first output to the second key 8, connected by one output to input time zadachtsy block 9 start button 10, zero-or-1 an 1 1 1, connect its input to the alternating voltage source 1, and the output to the second input of the start button 10, b. parity box 12, connected by the first input to the second output, the time of the setting unit 9, the second input to the output of the null organ 11, and - to the control input of the first

key

series-connected

excitation unit 13, magnetically sensitive element 1A, measuring amplifier 15 and comparison unit 16, dry. cell to the measuring amplifier by the first input, second input to the additional third output, time of the master unit 9 and source 17 of the reference voltage, connected to the third input of the block 16 comparisons, a third key 18, a main switch, an input to the output of the comparison unit 16, and exits parallel to the start button 10.

The device works as follows.

The voltage from the alternating voltage source 1 is fed to the input of the: i.-organ 1 1, which k; y-: once. When passing the alternating voltage half-wave through O, it is transferred to the opposite state. The output of the null organ 11 is made in such a way that juiuib short impulses with a duration of

PPN

Where

t is the impu.chsa duration; the duration of the alternating voltage period.

The start time of the driver unit 9 is performed on /. By pressing the start button 10. In this case, pa time the master unit 9 receives pulses from the null organ 1 1. The start time of the driver unit 9 occurs with the first incoming pulse from the null organ 11, and subsequent pulses do not affect its operation until the demagnetization cycle is completely completed.

The timing of the driver unit 9 consists of four series-connected single-oscillators on logic elements covered by connections that prevent the simultaneous operation of at least two of them.

The first one-time clock of the master unit 9 provides the enable signal for the start of the slave (; you of the parity block 12. The parity block 12 is designed as a single-oscillator with a M output and duration of operation defined by one full period of alternating voltage source 1. The output of the block 12 parity is connected to a key 2, which is a symmetric tp. Parity block 12 is triggered by a zero-body pulse.

11 at the time of the arrival of the resolution signal from the first one-vibrator, the time of the master unit 9. The parity unit 12 maintains the key 2 open for the time of two shock waves of two opposite polarity currents in the winding of the electromagnet 7. Thus, the unit

The 12 parity provides the same amount of half-wave current of opposite polarity passing through the winding of the electromagnet 7.

Since the start-up time of the driver unit 9 occurs at the time the half-wave of the alternating voltage passes through O, the current in the electromagnet winding begins to increase smoothly from the zero level as each alternating voltage half-wave passes. Consequently, with the same parameters of diodes 3 and 4, capacitors 5 and 6, and the amplitude of the alternating voltage of source 1 in the demagnetization device, the current amplitude dp of different half-waves in the electromagnet winding is high, and an even number of half-waves of current of different polarity in the winding. There is no sharp throw in the device.

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current in the electromagnet winding at the time of the start of the demagnetization cycle.

The second one-shot time specifying unit 9 serves as the dd1 turn-on delay of the third one-shot. The delay of switching on the third one-shot of the time of the driver unit 9 is necessary in order to close the key 2 after the end of the first single-vibrator operation. After the work of the second one-shot is completed, the time of the master block 9 triggers the third one-shot, which includes the second key 8 performed on the thyristor. When this occurs, the discharge of capacitors 5 and 6 through the key 8.

After the work of the third one-shot finishes, the time of the master block 9 triggers the fourth one-shot vibrator, which gives the enable signal to start the work of the compare block 16 The compare block 16 is a comparator with three inputs and one)} m output. The two inputs (first and second) of the comparison unit 16 are used to compare two electrical signals, and the third - the gate input - to enable the operation of the comparison unit 16.

The first input of the comparator unit 16 receives a signal from the output of the measuring amplifier 15. Measuring amplifier 15 is necessary for amplifying and selecting the signal from the magnetically sensitive element 14 connected by an output to the input of the measuring amplifier 15.

The magnetically sensitive element 14 can be made in the form of a fluxgate, Hall sensor, magnetoresistor, or other element sensitive to magnetic fields.

The excitation unit 13 is a constant or alternating current source with an output current ensuring the normal operation of the magnetically sensitive element 14.

The second input of the comparison unit 1b is connected to the source 17 of the reference voltage, which is a stabilized adjustable voltage source.

When the control signal arrives from the third output, the time of the clamping unit to the second gate input

block 16 comparison occurs

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gom and his way out. At a higher signal level with ;; 1 meter :-) 1OG1.1 ycn ip bodies 15 of a predetermined sign: J cheats for genes on the source 17 of the reference voltage on the reference circuit 16, a control signal appears that triggers a key 18 connected by an input to the output of the comparison unit 16. At the same time, the driver unit 9 will start receiving pulses from the zero-body 1I. This leads to a new launch of the degaussing cycle of the product. If the quality of demagnetization after the end of the second degaussing cycle turns out to be insufficient, which is registered by the magnetically sensitive element 14 and the subsequent previously listed blocks, the rammagnetization cycle will be repeated. The rammagnetization cycles are repeated until t x until the demagnetization quality reaches the required value set by adjusting the voltage on the source 17 of the reference voltage.

When using the proposed device, the quality of demagnetization of products is improved, since the level of demagnetization is controlled by a magnetically sensitive element and can be carried out for several cycles until the required quality of the magnetization reagent is obtained.

Claims (1)

Invention Formula Device for degaussing products according to ed. St. By 1430993, about tlychuyup (it is that, in order to increase the reliability of demagnetization due to automatic tracking of its level, it is equipped with a series-connected excitation unit, a magnetically sensitive element and a comparison unit, the second input of which is connected to the output time of the master unit, the source the reference voltage, the output connected to the third input of the comparison unit, and the third key, connected by its input to the output of the comparison unit, and the outputs parallel to the start button.