SU752209A1 - Device for rejecting magnetic cores - Google Patents

Description

i.a, a second input of the output unit is connected to, a generator, a series of single pulses.

The drawing shows the functional diagram of the device for | exploring magnetic cores.

The device contains a generator / magnetizable emulsions with a magnetizing winding 2 connected to the lem, measuring winding 3, three positive horn elements 4, 5 and 6, delay line 7, shaper 8 Time interval, coincidence element 9, trigger 0, counter 1.1 imulove, output unit 12 1I generator 13 single them, pulses. Inputs. Threshold elements 4, 5 w. €. Connected to the meter winding 3, the output of the first threshold element 4 is connected to the first input of the trigger 10. The output of the second, rogo: threshold element 5 through the delay line 7 and -form1р | О, the detector 8 of the time interval is connected to the first INPUT co-ownership

9. The output of the third threshold element 6 is connected to the second input of the coincidence element 9 connected to the output of the second input of the trigger, 10, the output of which is connected through the counter // to the first input of the output unit 12, the second input of which is connected to the generator 13 single pulses.

The device works as follows.

The generator / by means of na1mag, n: excitation winding i2. Magnetizes the test sample, as a result of which, in the measuring winding 5 ″ vods, there are impulses of DCS to be monitored by amplitude and duration. The core is considered suitable if the amplitude of the pulse of the secondary EMF exceeds a certain level, and the duration of its decline between levels lies within certain limits. The amplitude of the pulses is selected by the threshold element 4, at the output of which a pulse appears only if the amplitude of the secondary EMF pulse and the measuring winding 3 of the test core exceeds the first predetermined level. When this happens, the flip trigger

10. The duration of secondary emf pulses is selected using the nodes 4-8. The threshold element 5 gives them a pulse, the beginning of which corresponds to the intersection of the second predetermined level by a controlled pulse (IB of its falling part). This pulse is delayed by delay line 7 for a time, which defines a lower threshold in duration. Next, this pulse triggers a time interval shaper 3, at the output of which a pulse of a certain duration is formed, which is a temporary gate for raking the core along a length of time: the output pulse and the first input of the element coincident of the output 9. At the intersection of the secondary EMF pulse

in the measuring winding, 3 t-yr of the third-predetermined level heart triggers threshold element 6, (which gives an impulse to the second input of the coincidence element 9. If the given imulse falls into the temporary gate, then the coincidence element 9 produces a pulse arriving at the second input of the trigger 10. As a result, the trigger 10 is reset to the initial state and the counter code is increased by one. When a certain code is reached, a voltage appears on the output of the counter, carrying information about the validity of the test heart. The presence of a counter 1.1 in this device eliminates the false triggering of the automaton from occasional interference occurring in the measuring winding 3. At the time when the core is installed in the measuring

position, a single impulse 13 generator is started with a pulse duration, a slightly larger product of the number of secondary pulses. EMF from the test core, is necessary for the voltage to appear at the output of the counter, for the next tracking period. The impulse from the generator 13 is fed to the second input of the output unit 12, made in the form of a coincidence circuit and a power amplifier, the load of which is the distributor electromagnet. When the impulse from the generator 13 goes to the first input of the output device, the voltage from the output of the counter 11 flows, then the electromagnet works and the polarizer is sent to the bunker with suitable cores. Before starting the control card, the counter code is automatically set to zero.

If the core does not satisfy the condition of validity, one of the inputs of the trigger 10 does not receive pulses, the counter code, 11 does not increase, the center of the electromagnet does not occur, and the core falls into the Bra.

Claims (2)

1. Author's certificate of the USSR L 155837, cl. G 01 R 33/12, 1958. 2. Kiefer I. I. Testing of ferromagnetic materials, M., 1969, p. 291.