SU1043551A1 - Device for ferromagnetic article sorting - Google Patents

Abstract

A DEVICE FOR SORTING FERROMAGNETIC PRODUCTS, containing a series-connected saw-tooth generator and a variable frequency generator, two measuring channels, each of which consists of a series-connected electromagnetic converter connected to the output of the variable-frequency generator, and a detector, a driver, and also a series-connected comparator and An indicator, characterized in that, in order to increase the sorting performance, it is equipped with a third and fourth meter. The driver channels are identical to the two first, second, third, and fourth comparators; the driver is connected to the first input of the first comparator by the output, the first input to the output of the second comparator, and the second input to the output of the third comparator, the first inputs of the second, third, and fourth comparator are connected respectively to the outputs of the first, second and fourth measuring channels, the second inputs of these comparators are unified (L and connected to the output of the third measuring channel, and the output of the third cubic meter is connected to the second input of the first comparator. with SP ate

Description

The invention relates to non-destructive testing and can be used to sort ferromagnetic products.

A device for sorting electrically conducting objects is known, comprising a variable frequency generator, an electromagnetic converter, a signal processing unit including a phase meter and a voltage source connected to its reference input, and an indicator, as well as a closed system of automatic frequency control connected between the output a phase meter and a control input of a variable frequency generator C; The disadvantage of such a device is low sorting performance, which is associated with awn of presetting the upper and lower tolerances on the measurement results. In addition, it is necessary to periodically check the compliance of the established tolerances due to the instability of the electronic components of the device. In addition, the device cannot be used to control ferromagnetic materials.

The closest to. The invention the technical essence is

, a device for sorting ferromagnetic products, containing a series-connected sawtooth generator and a variable frequency generator, two measuring channels, each of which consists of a series-connected electromagnetic converter connected to the output of the variable frequency generator, and a detector, series-connected comparator, connected first and the second inputs to the outputs of the respective measuring channels, the null block, the memory element, the driver and the installation block in and a similar state connected by the output to the memory input of the memory element and the input of the saw-tooth generator, eg 1 | Keny, as well as an indicator connected to the output of the variable frequency generator and made in the form of a frequency meter 2.

A disadvantage of the known device is that the sorting performance is low, which is due, on the one hand, to the limitation of the rate of change in frequency due to the error in fixing the balance frequency and, on the other hand, to the need to set upper and lower tolerances by the measurement results and their periodic check.

The purpose of the invention is to increase the sorting performance.

The goal is achieved by the fact that the device for sorting

f (2-magnetic products containing a series-connected saw-tooth generator and a variable frequency generator, two measuring channels, each of which consists of a series-connected electromagnetic transducer connected to the output of the variable frequency generator, and a detector, a driver, and a series-connected comparator and the indicator is equipped with the third and fourth measuring channels, identical to the two first, second, third and fourth comparators, the driver under The output is connected to the ne; the primary input of the first comparator is the first input to the output of the second comparator and the second input to the output of the third comparator; the first inputs of the second, third and fourth comparators are connected to the outputs of the first, second and fourth measuring channels, respectively; the second inputs of these comparators combined and connected to the output of the third measuring channel, and the output of the third comparator is connected to the second input of the first comparator.

FIG. .1 is a block diagram of the device; Fig. 2 shows the dependences of the voltages at the outputs of the measuring channels on the part.

The device consists of a series-connected generator 1 of the saw-tooth voltage and a generator 2 of variable frequency, four measuring channels, each of which consists of a series-connected electromagnetic converter 3 (4, 5 and b, respectively) and detector 7 (8, 9, and 10, respectively) comparators 11, 12, 13 to 14, as well as the imaging unit 15 and the indicator 16 connected to the output of the comparator 14, the comparators 11-13 are connected by the first inputs to the outputs of the first, second and fourth measuring channels, respectively, and the second The inputs of these comparators are combined and connected to the output of the third measuring channel, the inputs of all measuring channels are connected to the output of the variable frequency generator 2, the comparator 14 is connected to the outputs of the comparators 11 and 12 via the driver 15 to the outputs of the comparator 13. The second input to the comparator 13. Electromagnetic The 3-6 thread converters are identical to each other.

The device works in a regular way.

The electromagnetic transducer 6 is mounted on a sample, a predetermined parameter of which is controlled, the electromagnetic transducer 5 is installed in air.

an electromagnetic transducer 3 is installed on a sample whose predetermined parameter is selected with the upper tolerance limit, an electromagnetic transducer 4 is installed on the sample whose predetermined parameter is selected with the lower tolerance floor limit,,

When the device is turned on, the generator 1 of the sawtooth voltage generates a signal that is fed to the control input of the variable frequency generator 2 and causes a change in the frequency of the output signal. From the output of the generator 2, the signal enters the inputs of the electromagnetic transducers 3-6 and forms their electromagnetic fields. As a result of the interaction of electromagnetic converters 3, 4 and 6 with the corresponding. The corresponding samples receive a set of voltage amplitudes at the output of these transducers. The dependence of the amplitude of the output voltage of the electromagnetic transducers 3, 4 and b on the frequency of the signal of the generator 2 is reflected by curves 17-19 and the amplitude of the output voltage of the electromagnetic transducer 5 installed in air varies along curve 20 (Fig. 2).

The signals c, the outputs of the electromagnetic transducers 3-6 are converted by the corresponding detectors 7-10. The detected signals come from the outputs of the detectors 7, 8 and 10 to the first inputs of the comparators 11-13. The detected signal from the output of the detector 9 is fed to the second inputs of the comparators 11-13. At the moment of equality of the amplitudes of the voltages of the signals arriving at the first and second inputs of the comparators 11-13, signals are generated at the output of said comparators. The duration of these signals is determined by the time interval in which the amplitude of the signal voltage at the first inputs of the comparators 11-13 is greater than the amplitude of the signal voltage at the second inputs of the specified comparators. The signal from the output of the comparator 11 is fed to, the 1st input of the driver 1.5 pulses. The signal from the output of the comparator 12 is fed to the second input of the imaging unit 15 pulses.

The pulse shaper 15 forms a square pulse, the beginning of the formation of which coincides with the signal received at the second pulse.

0 the input of the former 15. The formation of a rectangular pulse stops with the arrival of a signal at the first input of the former 15. If the monitored parameter of the sample test lies in the tolerance field (curve

5 19; FIG. 2), a pulse at the output of the comparator 13 appears during the period of formation of the pulse. From the output of the imaging unit 15, the signal arrives at the first input of the comparator 14. C

0, the output of the comparator 13 is fed to the second input of the comparator 14. At the output of the comparator 14, a signal is formed under the condition of simultaneous input of signals to the first

5 and the second inputs of the comparator 14. The presence of a signal at the output of the comparator 14 is monitored by means of an indicator 16.

I

0

If the monitored parameter of the test sample is outside the tolerance field, the simultaneous presence of signals at the inputs of the comparator 14 is excluded, which leads to the absence of

5 signal at its output.

The use of the proposed device for sorting ferromagnetic objects makes it possible to significantly increase productivity.

0 as the correspondence of the controlled product to the tolerance field is automatically obtained when the generator frequency is continuously changed without allocating a balance frequency. In addition, the sorting accuracy is improved,

5, since the upper and lower sorting limits are established directly in the measurement process of the control samples.

2

17

Frequency

Claims (1)

DEVICE FOR SORTING FERROMAGNETIC PRODUCTS, containing a sawtooth voltage generator and a variable frequency generator, two measuring channels, each of which consists of a serially connected electromagnetic transducer connected to the output of a variable frequency generator, and a detector, a shaper, as well as indicator and indicator, characterized in that, in order to increase the sorting performance, it is equipped with a third and fourth meter channels identical to the two first, second, third and fourth comparators, the driver is connected by the output to the first input of the first comparator, the first input to the output of the second comparator and the second input to the output of the third comparator, the first inputs of the second, third and fourth comparators are connected respectively to the outputs of the first, second and fourth measuring channels, the second inputs of these comparators are combined and connected to the output of the third measuring channel, and the output of the third cbparator is connected to the second input at the first comparator. Figure 1