SU711509A1 - Device for rejecting cores by pulse magnetic permeability - Google Patents

Description

The invention relates to the field of magnetic measurements and can be used to control and sort out ferrite cores according to the magnitude of the pulsed magnetic permeability.

A device is known for sorting $ cores by pulsed magnetic permeability. The device comprises a software device, a measuring circuit, a magnetizing pulse generator, an analog-to-digital converter, an electronic computer, and an 11Ί recorder.

The disadvantage of this device is the lack of precision control of the cores.

Also known is a device for sorting cores by pulsed magnetic permeability, containing a master oscillator, magnetizing generators. " pulses, integrator, key, selectors and control unit Г 2].

The instability of the parameters of the magnetizing pulse generator leads to a change in the magnitude of the magnetizing field and a decrease in the accuracy of the rejection, which is a significant drawback of this device.

Periodic monitoring of the parameters of the generator of magnetizing pulses, performed in the process of work by the operator, takes away ^; a lot of time, reduces the performance of the device.

The purpose of the invention is to increase the accuracy and performance of core sorting.

This goal is achieved by the fact that in the device containing the magnetizing pulse generator, the outputs of which are connected through the magnetizing windings to the main control resistors, the integrator is connected in series, the first voltage-code converter and an electronic computer, as well as the second voltage-code converter connected clock generator, core size setting unit and demagnetizing pulse generator, transportation unit, two signal switches command decoder, the first and second outputs of which are connected to the first inputs of the magnetizing and demagnetizing pulses generators, the outputs of the latter are connected to m magnetizing windings, the third output of the command decoder is connected to the control input of the first signal switch, the inputs of which are connected to the mains by measuring windings, and the output to input integrator. The fourth output of the command decoder is connected to the control input of which is a signal switch, the inputs of which are connected to the GL by control resistors U of magnetizing windings, and the output of the second switch through a second voltage-code converter is connected to the second input of the electronic computer, whose i-th output is connected to the first input command decoder, the fifth output of the command decoder is connected to the input of the transportation unit, the output of which is connected to the second input of the command decoder, while the output of the generator acts is connected to the control input of the instruction decoder and the input setting unit sizes of cores, and the output setting unit sizes cores connected e administering demagnetizing and magnetizing pulse generators inputs. .

The block diagram of the device is shown in. 1 "_ timing diagrams of operation - in FIG. 2.

The device consists of a generator 1 of demagnetizing pulses, a generator of 2 magnetizing pulses, a block 3 of setting the standard sizes of the cores, test samples 4, 5, 6 with input terminals 7, 8, 9, output terminals 10, 11, and 12 and control resistors 13, 14 and 15, signal switches 16 and 17, integrator 18, voltage-to-code converters 19 and 20, electronic computer 21, command decoder

22, the transport unit 23 and the clock generator 24.

The device operates as follows.

At the output of the computer 21, the readiness command for generating readings of the measuring positions of the trans-1 sorting unit 23 is formed at a given frequency. If there is a test sample on the appropriate control position, the transportation unit 23 generates a ready signal to the command decoder 22, which allows the generation of commands control the measuring circuit of the device.

The clock generator 24 generates a repeating sequence of clock cycles (Fig. 2 ΤΙ, T2, TK), designed to synchronize the joint operation of the measuring circuit of the device and the position of the culling block transport core 23.

Three consecutive clock cycles ΤΙ, T2, TK form the cycle of the clock generator 24. From the diagram of FIG. 2 it can be seen that during the cycle of the ΤΙ (П - 1) –th cycle, the parameters of sample 4, are monitored. In this case, the sample is affected by the test program of current pulses, the magnitude of the pulsed magnetic permeability is calculated from the results of the exposure, and, therefore, the group to which the sample belongs.

During measures T2 and TK (P - 1) of the -th cycle at the control position, samples 4 and, as well, change. T1P — th cycle, the control of parameters is repeated on a subsequent sample.

In the step of the T2 (n -1) -th cycle, the parameters of sample 5 are monitored, during the steps of the TK (u - 1) -th cycle and T1 of the d-th cycle, samples 5 are changed, and in the step of the T2n-th cycle, parameters are monitored. Similarly, in cycle ТЗ (η –1) of the -th cycle, sample 6 is controlled, during cycles Т1 and Т2

And - of the cycle it is replaced by the next, etc.

Consider the operation of the device during sample control 4. In step T1, if the sample is at measurement position 4, command decoder 22 generates a start signal for the demagnetizing pulse generator.

The generator 1 generates at the first output X, current pulses, for example four, with a given repetition rate and amplitude sufficient to demagnetize the sample being tested. After the end of the last demagnetizing pulse, the command decoder 22 generates a start command for the magnetizing pulse generator 2, which generates K. magnetizing current pulses at the first output, for example sixteen, e. given repetition rate and amplitude, necessary to create a given magnetic field strength. Part of the magnetizing pulses, for example K / 2, stabilize the position of the working point of the sample, subsequent K / 2 pulses are measuring. The pulses of the magnetizing current from the first output of the generator 2 are fed to the input terminal 7 of sample 4. The signals from the output terminal 10 of the sample 4 are sent to the first input of the signal switch 16, which, according to the control command received at the control input from the command decoder 22, extracts of the entire sequence of signals, only those that were caused by the action of measuring pulses. Thus, signals proportional to the magnetic induction in time are removed from the output of the signal switch 16, which are integrated by the integrator 18 and converted by the Voltage-code * 19 converter into a digital code proportional to the increment of the magnetic induction caused by the action of the measuring pulse. This digital code is fed to the first input of the computer 21.

The pulses of the magnetizing current passing through the magnetizing winding of sample 4 create voltage pulses on the control resistor 13, the magnitude of which is proportional to the magnitude of the magnetizing current, and, consequently, the magnitude of the magnetizing field in the pulse. The signals of the control resistor 13 are fed to the input of the signal switch 17. According to the control command received from the command decoder 22 to the control input of the signal switch 17, the latter passes to the input of the voltage-code converter 20 only those signals that are caused by the action of the measuring pulses. A digital code proportional to the increment of the magnetizing field strength is fed to the second input of the computer 21, the computer 21 averages the data obtained as a result of exposure of the test sample 4 to magnetizing pulses and calculates the value of the pulse permeability of sample 4 ₍ 'by the formula:

Xj,,

And KgU (aH) where ιΚλΈΊ is the voltage proportional to the increment of the magnetic induction caused by the magnetizing current pulse;

U (DN) is the voltage proportional to the strength of the magnetizing field e in the magnetizing pulse;

is the conversion coefficient of the voltage-code converter 19j Kg is the conversion coefficient of the voltage-code converter 20. Having determined the value of the pulsed magnetic permeability of the test sample 4, the computer 21 compares it with the set limits of the pulsed magnetic permeability within each of the Suitable groups. Code of one of the groups Suitable or groups • Defective through the command decoder 22 is supplied to the input of the transportation unit 23, which provides the feed; Sample 4 into the appropriate hopper. The change of samples 4 occurs during measures T2 and TK, as follows from the time diagram of FIG. 2. After generating the code for the sample group group 4, the computer 21 again generates cyclic commands for interrogating the measurement position of the transportation unit 23. Thus, during the T1 cycle, the computer provides the test circuit for testing the current program, calculates the pulse permeability of the sample and generates the code for its group. In step T2 in the presence of sample 5 at the measuring position and in step TK if there is sample 6 in the measuring position, the operating sequence of the device is saved. The block size selection of the core size 3 provides automatic change in the magnitude of the amplitude of the pulses of the generators 1 and 2, depending on the size of the test core, located at the measurement position. As a result of this, the proposed device provides simultaneous sorting of the cores of three different sizes.

Claims (2)

The invention relates to the field of magnetic measurements and can be used to control and sort out ferrite cores by the magnitude of the pulse magnetic permeability. A device for screening cores by pulsed magnetic permeability is known. The device has a software device, a measuring circuit, a generator of magnetizing imprints, an analog-digital converter, an electronic counting machine and a 1P recorder. The disadvantage of this device & is the lack of accuracy in the control of cores. It is also known a device for raebrabraking cores by pulsed magnetic permeability, containing a master oscillator, generators of magnetizing lower pulses, an integrator, a key, c & lecturers, and a control unit G 2. The instability of the parameters of the generator and the magnetizing pulses leads to a change in the magnitude of the intensity of the magnetizing field and a decrease in the accuracy of screening, which is a significant disadvantage of this device. Periodic monitoring of the parameters of the magnetizing pulse generator produced by the operator in the process of operation takes a lot of time and reduces device performance. The purpose of the invention is to improve the accuracy and performance of core screening. The goal is achieved by the fact that in a device containing a generator of magnetizing pulses, the outputs of which are connected through try magnetizing windings to try control resistors, sequentially connected integrator, first voltage-to-voltage converter and an electrosigned computing machine, and a second converter, voltage e-code , introduced in series connected clock generator, THnopasNicpa task set of cores and demagnetizing pulse generator, transport unit, two signal switches and de If the first and second outputs of the commands are connected to the first inputs of the magnetizing and demagnetizing impulses, the first inputs of the last are connected to the magnetizing windings, the third output of the command decoder is connected to the control input of the first switch of the signals, which inputs are connected to the ff meter, the inputs of which are connected to the ff meter, which is connected to the control input of the first switch of the signals, whose inputs are connected to the ff meter, the inputs of the first switch to the entrance in-. Tegrator. The fourth output of the command desharer is connected to the control input of which is a switchboard of the signals, the inputs of which are connected to the GP by the control resistors of the magnetizing windings of the magnetizing windings, and the output of the second switch through the voltage-code converter is connected to the second input of the electronic extraction machine, the output of which is connected to the first input command decrypt | 5, the fifth output of the command decoder is connected to the input of the transport unit, the output of which is connected to the second input of the command decoder, while the output of the clock generator connected to the input of decrypted upravl5yoschim torus commands and input block sizes specifying cores, and the output specifying blotsa sizes of cores is connected to a control pulse magnetizing and demagnetizing yuschimi generators inputs. . The block diagram of the device is shown in FIG. one; time diagrams of work - on. 2. The device consists of a demagnetizing impulse generator 1, a magnetizing impulse generator 2, a unit 3 setting core sizes for test samples 4, 5, 6 with input terminals 7, 8, 9, output terminals 1O, 11, and 12 and control resistors 13, 14, and 15, the switchboard of signals 16 and 17, the integrator 18, the voltage-code converters 18 and 20, the electronic computing machine (computer) 21, the command decoder 22, the transport unit 23, and the clock generator 24. The device operates as follows “D way. At the output, the computer 21 is formatted with a predetermined frequency of the polling command of the measuring positions of the transherting unit 23. If there is a test sample at the corresponding control position, the transport unit 23 generates a readiness signal to the decoder 22 that allows the device to control the control circuit of the device. The clock generator 24 forms a repeating clock sequence (Fig. 2 T1, T2, TZ) designed to synchronize the joint operation of the device’s measuring circuit and the screening position of the core transport unit 23. Three successive T1, T2, TZ cycles form the cycle of the clock generator 24. From the diagram of figo 2 it can be seen that during the cycle T1 (P “1) o of the cycle, the parameters of sample 4 are monitored. In this case, the sample is subjected to a test program of current pulses, based on the results of the action, the magnitude of the pulsed magnetic permeability is calculated, and, consequently, the group to which the sample belongs. During cycles T2 and TZ of the (11–1) -th cycle, sample 4 is changed at the control position, and the parameters are already checked on the subsequent sample as well. In cycle T2 (n -1) -th cycle, parameters of sample 5 are monitored, during cycles of TK (n-1) -th cycle and T1 -th cycle, sample 5 is changed, and in cycle T2 of the U -th cycle, parameters are monitored. Analogue of the S clock cycle of the TK (-1) -th cycle is controlled by sample b, during cycles T1 and T2 of the V -th cycle it is replaced by the next one, and so on. Consider the operation of the device during sample control 4. In step T1, when a sample is pressed on the measuring position 4, the decoder of commands 22 generates a start signal for the demagnetizing impulse generator. The generator 1 generates at the first output of current pulses, for example, four, with a predetermined following frequency and amplitude sufficient to demagnetize the sample under test. After the end of the last demagnetizing pulse, the decoder of commands 22 generates a command to start a generator of 2 magnetizing pulses, which at the first output absorbs the K. magnetizing current pulses, for example sixteen, with a predetermined following frequency and amplitude necessary to create a given intensity of HaNtarHHHHarlow . A part of magnetizing pulses, such as K / 2, stabilize the positions of the working point of the sample, the next K / 2 pulses are measuring. The impulse of magnetizing current from the generator 2 output is fed to the input terminal 7 of sample 4. The signals from the output terminal 10 of sample 4 are fed to the 1 input of the switch of the signal 16, which after the control input to the control input from the command decoder 22, emits of all sequences of signals, only those that are caused by the action of measuring pulses. Thus, the output of the switch of signals 16 removes the signals proportional to the magnetic induction over time, which are integrated by the integrator 18 and converted by the voltage-code converter 19 into a digital code proportional to the magnetic moment caused by the action of the measuring pulse. This CI45EOVA code arrives at the first input of the computer 21. The pulses of the magnetizing current, the passage through the magnetizing winding of sample 4, create voltage pulses on the test resistor 13, the magnitude of which is proportional to the magnetisation current, and, consequently, the voltage of the magnetisation field impulse. The signals of the control resistor 13 are fed to the input of the switch of signals 17. By the control command received from the decoder of commands 22 to the control input of the switch of signals 17, the latter passes to the input of the voltage-code converter 2O1-1 signals,. which are caused by the action of measuring pulses. The digital code, proportional to the magnitude of the magnitude of the magnetizing field, arrives at the second input of the computer 21. The computer 21 averages the resultant effect on the sample 4 by magnetizing data pulses and calculates the value of the pulse magnetic permeability of sample 4i by the formula:) K, jU (um where is the voltage proportional to the increment of magnetic flux caused by the impulse of the magnetizing current; and (li) is the voltage proportional to the intensity of the magnetizing field E in the magnetized gm pulse; K - voltage-to-converter converter 19} K2 ratio — voltage-to-converter converter 20 conversion coefficient. After determining the value of the pulse magnetic permeability of the test sample 4, the computer 21 compares it programmatically with the target limits of the pulse magnetic permeability within each of the Fit groups. The code of one of the Fit groups or groups of commands Rejected through the decoder 22 enters the input of the transport unit 23, which provides sample 4 to the corresponding bunker. The change of samples 4 takes place during the cycles T2 and TZ, as it follows in the time diagram of FIG. 2. After forming the sample code 4, the computer 21 again generates cyclic commands for polling the measuring position of the transport unit 23. Thus, during a clock cycle T1, the computer provides the measuring circuit of the current test program, the calculation of the sample pulse value and the generation of the group code. In cycle T2, if there is a 5 n sample on the measuring position in the TK cycle, the device operation sequence is saved at the measuring position of sample 6. The block for selecting the size of cores 3 automatically changes the amplitude of the pulses of the generators 1 and 2 depending on the size of the test cores that are at the position of the measured 1W. As a result, the proposed device provides for accurate scattering of the cores of three different lengths. The invention includes a device for sorting out the cores by impulse magnetic permeability, which contains a generator of magnetizing impulses, whose outputs through the GI magnetizing windings are connected to a yen control resistors, serially connected by an integrator, the first voltage-to-voltage converter and an electronic calculator, and a second converter, and a second converter, and a second converter, and a second converter, and a second converter, and an electronic converter. code, which differs from the fact that, with a distance of accuracy and productivity of screening cores, it is additionally entered after octually, a clock generator is connected to a set of core sizes and a demagnetizing pulse generator, a transport unit, two signal switches and a command decoder, the first and second outputs of which are connected to the first inputs of the magnetizing and demagnetizing pulses, the outputs of the latter are connected to m magnetizing windings, the volts are each connected to m magnetizing windings, the third part of the generators, and the demagnetizing pulses; (| Command Commander is connected to the control input of the first signal switch, whose inputs are connected to the measuring windings, and the output to the integrator input , the fourth output of the command decoder is connected to the control input of the second switchboard of signals, inputs of which-6 are connected to the control resistors Ø of the magnetizing windings, and the output of the second switch is connected to the second input of the electronic computer, the output which is connected to the first input of the command decoder, the fifth output of the command decoder is connected to the input of the transport unit, the output of which is connected to the second input of the command shifter, and the generator output cycles is connected to the control input of the command decoder and the input of the block of specifying core sizes, and the output of the block of specifying core sizes is connected to the control inputs of the demagnetizing and magnetizing impulse generators. ; Sources of information taken into account in the examination .1. Miroishik I. & A. and Pirogov A. K. Methods for measuring the pulse characteristics of compact magnetic cores, M., Energie, 1977, p. 9O-91. 2. USSR author's certificate number 552579. class. O 01 R 33/12, 1976. tpmk / t p-yikl (cycle