SU670911A1 - Device for sorting cores by their magnetic properties - Google Patents

Description

The figure il presents the block diagram of the device.

On yypie 2 presents diagrams, temporal relationships of signals.

The device contains a measuring coil /, a generator 2 of frequency-modulated oscillations, a frequency measurement unit 3, a first register 4, a second register 5, a subtraction unit 6, an extremum extraction unit 7, an analysis unit 8, a loading unit 9, a pulse former 10, a counter // and element And 12.

The device works as follows.

The core passes the measuring coil. Before the core enters the measuring coil 1, the loading unit 9 generates a signal (Fig. 2), from which the driver 10 is started and the register 4 is prepared for receiving the code. Shaper 10 generates pulses of fixed duration At which open element 12 and the number of which determines the number of frequency measurement cycles by frequency measuring unit 3 in one sorting cycle. In addition, from the setup output of the imaging unit 10, the impulses are set to the Installation line of the counter 11, by means of which the counter 11 is set to the state “O” before receiving the impulses from the output of the And 12 element.

In the first measurement cycle, in time L, pulses are output from the generator output through the AND 12 element. 2, the number of which is proportional to the initial value of the generator generator frequency 2. In counter 11, code A is loaded, which is stored in register 4, where it is stored during the entire sorting cycle.

In subsequent measurement cycles, when the core passes through the measuring coil /, the inductance of the latter increases, and consequently, the frequency of the generator 2 decreases relative to the original. At the same time, in the counter // a code L is formed proportional to the effective frequency of the oscillator 2, which from the counter // goes to subtraction unit 6, where it is subtracted from code A stored in register 4. The code (corresponding to the difference between the initial and effective frequencies, the output of subtraction lock 6 enters an extremum extraction unit 7. Since when the core passes through the measuring coil / when the core passes through the center of the core, the frequency of the generator 2 reaches a minimum, the corresponding difference code (A-Amin) entered 7 extremum will have a maximum value in relation to the previous and subsequent values. As a result, a signal is generated at the control peak of the extremum extraction block 7, which will go to the second input of the generator 10, and the frequency measurement process by the block 3 will stop. the signal from the control output of the unit 7 will go to the control

the input of the register 5, while the last one will write the code (L-Atgi) corresponding to the maximum frequency difference, initial and effective, i.e. the code is proportional to the effective magnetic permeability of the core passed through the measuring coil /. The code from the output of register 5 enters the analysis block 8, if the device operates in the sort mode, IL | AND to the device output, if it operates in the static information accumulation mode. In the second case, a recorder can be connected to the output, documenting the magnetic permeability of the studied cores, for example, to determine the sorting ranges of the new batch of cores. When sorting | e in analysis block 8, the received quantity is compared with the values corresponding to the boundaries of pears

sorting. Thereafter, a signal is generated at the corresponding output of the device, controlling the corresponding sorting gate, with the result that the core under test falls into its group.

The parameters of the driver W (the period following and the pulse duration at the control output) are selected, based on the sorting accuracy and the speed of passage of the cores, through the measuring coil 1.

Over time, during operation of the device, as a result of the destabilizing factors, the initial frequency of the generator 2 changes. However, this

the measurement accuracy does not have a significant effect, since the time interval between measurements of the ishada frequency value and its minimum value is small, and hence the frequency deviation of the generator

2 due to the action of destabilizing factors is negligible.

Claims (2)

1. A device for sorting cores according to their magnetic properties, comprising a measuring coil connected in series and a generator of frequency-modulated oscillations, as well as a frequency measuring unit, an analysis unit and a loading unit, so that in order to improve the stability of the device, it additionally introduced a serially connected first register, fleas a subtractor, an extremum extraction unit and a second register, the output of which is connected to the input of the analysis unit and the output bus of the device, and the second input of the second register is connected to the second output of the allocation unit at the extremum and with the second input of the frequency measurement unit, the third input of which is connected to the output of the loading unit and the first input of the first register, the second input of the last is connected to the output of the frequency measurement unit and to the second input of the subtraction unit. 2. The device according to claim 1, characterized in that the frequency measurement unit is made in the form of serially connected pulse generator, element I and a counter, the second input of which is connected to the second output of the driver, and output It is connected with the output of the frequency measurement unit, the second input of the And coi element is connected to the first input of the frequency measuring unit, and the inputs of the impregnator are connected to the second and third inputs of the frequency measuring unit. Sources of information taken into account in the examination: 1. USSR author's certificate No. 391505, cl. G 01 R 33/12, 12.22.69. 2. USSR author's certificate number 385245, cl. G 01 R 33/12, 04.12.70. Cycle of FIG Z