SU845603A1 - Device for electromagnetic check of moving ferromagnetic components - Google Patents

Abstract

DEVICE FOR ELECTROMAGNETIC CONTROL moving ferromagnetic part comprising magnetizing system, serially connected a sensing coil and the amplifier and the series-connected comparator and presorting unit and registering, characterized in that, in order to increase reliability of control, it is provided with series-connected key and an integrator included between the outlet an amplifier and a first comparator input connected in series by a second comparator connected by an output to a control input a key, a strobe pulse shaper connected to the second input of the first comparator, and a delay circuit connected between the amplifier output and the integrator's control input. 00 4 pr od od about with

Description

one . The invention relates to non-destructive testing and can be used for structuroscopy of moving ferromagnetic parts. A device for measuring the residual induction of magnetic materials is known, which contains a magnetizing system and a primary measuring transducer of a magnetic field, an amplifier and a recorder in series l j. A disadvantage of the known device is the effect of the movement of the object being monitored on the results of the control. The closest to the invention in its technical essence is a device for electromagnetic control of moving ferromagnetic parts, comprising a magnetizing system, serially connected reading coil and amplifier, and serially connected comparator and sorting and recording unit 2 J. However, this device does not have the necessary reliability of control due to the influence of the variation in the speed of movement of the controlled parts on the results of the control. The purpose of the invention is to increase the reliability of the control. The goal is achieved due to the fact that the device is equipped with a serially connected key and an integrator connected between the amplifier output and the first comparator input, the second comparator connected in series, connected to the control input of the key, the strobe pulse former connected to the second input the first comparator, and the delay circuit included between the amplifier's output and the integrator's control input. FIG. 1 shows a block diagram of the device; Fig. 2 are timing charts of the signals of the readout coil U ((t) and the voltage across the integrator during the control process (). The device consists of a magnetizing system 1 connected in series to the readout coil 2, amplifier 3, switch 4, connected through a comparator 5 control input with output of amplifier 3, integrator 6 connected by control input through pulse shaper 3 and pulse delay circuit 8 with comparator output 5, comparator 9 connected by a second input to the strobe pulse shaper 7 and par 10 Forging and registration. Position 11 indicates the parts to be monitored, position 12 indicates the conveyor for feeding the parts into the magnetizing system 1. The device operates as follows .. The magnetizing system 1 is a ring permanent magnet or an electromagnet powered by a direct current. t through the conveyor 12 through the magnetizing system 1, and are magnetized until it is pressed in. The reading coil 2 is located behind the magnetizing system 1 in the course of movement of the test piece 11. Pass through the vayuschuyu coil 2, the magnetization of the part. 11 induces in it a signal which through the amplifier 3 is fed to the inputs of the key 4 and the comparator 5. At the moment of time. 2) the comparator 5 is activated, opens the key 4, and the signal from the output of the amplifier 3 is fed to the input of the integrator 6. The signal at the output of the integrator 6 changes according to the law, and at time 2 the comparator 5 is again activated and closes the key 4. The voltage on The integrator will be proportional. the value of S, which {is reckoned only on the magnitude of the residual magnetization in the central section of the part and does not depend on the speed of the part's passage through the axes. At the time 2 when the comparator 5 is triggered, the shaper-pulse shaper 7 will generate a pulse, C9 to which the comparator 9 will perform analog-to-digital processing of the signal of the integrator 6 and will give a command to the grading and recording unit 10. The delay circuit 8 delays the pulse from the gate driver 7 by the time necessary for the comparator 9 to operate, and

3845603

After that, the integrator 6 is zeroed in. The device is ready to control the next part. The conveyor 12 must provide the same position of the controlled parts in the process of passing them through the magnetizing and slitting coils. The signal of the device does not depend on the variations in the speed of movement of the parts being monitored and is determined only by the magnitude of the maximum residual magnetization, i.e. mechanical properties of the material controlled parts.

The performance of the device is determined practically only by the speed of mechanical transportation of the parts, as well as the magnetization of the part, and | The reading of information about its magnetic ps and mechanical properties takes place in the process of movement.

The use of the described device makes it possible to control the ferromahyrt parts in the technological flow of their manufacture without decreasing the productivity of production And with high reliability.

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Claims (1)

DEVICE FOR ELECTROMAGNETIC CONTROL OF MOVING FERROMAGNETIC PARTS, containing a magnetizing system, serially connected reading coil and amplifier, and serially connected comparator and blocking and registration unit, characterized in that, in order to increase the reliability of control, it is equipped with an integrator connected in series with the output the amplifier and the first input of the comparator, connected in series with the second comparator, connected by the output to the control input to yucha, strobe generator coupled to the output from the second input of the first comparator circuit and delayed ki included between the output of the amplifier and the control input of the integrator. Fig a