SU1133477A2 - Device for measuring displacement of reversively moving ferromagnetic articles - Google Patents

Abstract

DEVICE FOR MEASURING THE MOVEMENT OF REVERSIBLY MOVING FERROMAGNETIC PRODUCTS on auth. No. 998848, characterized in that, in order to reduce the error from changing the speed of movement of the product, it is equipped with a modulator, an RC chain and a pulse shaper connected in series and connected between the playback elements and the OR element, as well as the II-OR-NOT element included between phase detector and modulator.

Description

The invention relates to a measurement technique and can be used to measure the ne {) immersion of ferromagnetic products, for example, measurement for measuring the depth of a drilling tool in a well. According to the main auth. No. 998848 discloses a device for measuring the movement of reversibly moving ferromagnetic products, comprising a labeling element, two playback elements and associated with them, an electronic processing unit including a series-connected reversible counter and a recorder. A disadvantage of the known device is a decrease in accuracy when changing product speeds The purpose of the invention is to reduce the error due to changes in the product speed. The goal is achieved by the fact that the device for measuring the movement of reversibly moving ferromagnetic products is equipped with a moderator, an RC chain and a pulse shaper connected sequentially - between the playback elements and the OR element, as well as the 2-OR-HE element connected between phase detector and modulator. The essence of the invention is that, depending on the speed of movement of the product, it shifts. The horn of the electronic measurement circuit, thereby measuring the base decreases with increasing speed and increases with decreasing speed. Figure 1 shows the block diagram of the device; figure 2 - time diagrams showing the waveform in time at the main points of the circuit. . The device contains a magnetizing solenoid 1, two elements 2.1 and 2.2 of reproduction, a pulse generator 3 of the fundamental frequency, a divider 4 frequencies, a filter 5, a circuit 6 for phasing narrow pulses, and a converter 7, elements 2И-ШШ-НЕ 8 and 9, the first trigger 10 reversible counter, amplifiers-phasing 11 and 12, Schmidt trigger 13, coincidence circuit 14, modulator 15, RC-u pin 16, pulse spreader 17, recorder 18, driver of different polarity pulses, phase detectors 20 and 21, element OR 22, reversible counter 23 and toggle switch 24. Elements 3-8,11,13 and 14 form phase d detectors 20 and 21. The device operates sledztoschim way. From the generator 3, which is part of the phase detectors 20 and 21, the fundamental frequency pulses arrive at the primary processing of the playback elements 2 (point i) through the frequency divider 4 and the filter 5 as a harmonic signal of the fundamental frequency. On the secondary winding of the sensor, a double frequency signal is generated (at point 3), the phase of which depends on the polarity of the label on the ferromagnetic product applied by solenoid 1. The signal from the secondary winding of the playback element 21 is fed to the Schmidt trigger 13 to receive an output last rectangular pulses. Since the polarization point of the magnetized area of the product through the neutral point is taken as the mark, when reading the mark, if the product moves in the forward direction, the phase of the signal changes by 180 ° (at points e and k). This leads to the coincidence of the phases of the pulse of the fundamental frequency at the point k and of the narrow pulse, formed. at point 6, due to the interaction of the signals of the former b of the ultrasonic pulses of the inverter 1a 7 and the first trigger 10 of the reversible counter. The resulting signal from the coincidence circuit 13 of the phase detector 20 is used for switching the reversible counter 23 and registering the tag by the unit 18, as well as through the OR circuit 22 for applying the magnetic mark by means of a polarity generator 19 of opposite polarity for the purpose of fixing and fixing the opposite polarity. In the case of reversal, the readout of the magnetic marks is carried out by the oscillating element 22 in a similar manner, and the signal from the phase detector 21 is fed to the reversing reversing input-. counter 23 and the gate through the element OR 22 to the driver of 19 polarized pulses.

To reduce the measurement error with increasing velocity V, i.e. with decreasing time between readable labels, artificially: the label is shifted in the direction of decreasing the measurement base (and vice versa), which is achieved by using a circuit including a modulator, an RG chain and a pulse extender.

The scheme works as follows.

Each read tag is applied to a pulse spreader 17, the output of which receives the signals represented at point M (and). . The duration of a pulse in a trip line determines the charge time of the capacitor, the pause - discharge time. The higher the speed and the shorter the time interval between pulses, the shorter the discharge time and the higher the voltage across the capacitor. On the modulator 15, using the fundamental frequency signal obtained in circuit 14 in antiphase with the signal read from p, the trigger (and 2)) and according to the voltage measurement law, a compensating voltage is formed on the capacitor of the RC chain (and ". As a result, at a higher charge on the condenser, the total signal at point d passes through a transition, which at a lower

and this in turn will call de

but correspondingly lower or higher speeds of movement of the ferromagnetic product. Therefore, the mark is read sooner or later, respectively, by the speed of movement, the smaller or larger base itself will be reduced by itself.

 The process is described by the expression

g

where P (v) is the amendment to be made due to compensation.

If one chooses the time constant of the RC chain so that, then, the measurement speed error from the business is eliminated.

The invention makes it possible to automatically compensate for the bucket without the use of operator labor.

Thus, this device provides accurate and reliable product markup.

Claims (1)

DEVICE FOR MEASURING THE MOVEMENT OF REVERSELY MOVING FERROMAGNETIC PRODUCTS according to ed. No. 998848, characterized in that, in order to reduce the error from changing the speed of the product, it is equipped with a modulator, an RC chain and a pulse shaper connected in series and connected between the playback elements and the OR element, as well as the 2AND-OR-NOT element included between phase detector and modulator. Phi. " 7 ί