SU1385106A1 - Device for controlling quality of wire insulating coating - Google Patents

Abstract

The invention relates to the technique of electrical measurements and can be used, for example, to control the quality of enamel insulation of wires during their manufacture and in the manufacture of electrical winding products from them. The invention improves the control accuracy by taking into account the speed of the wire and simplifies the quality control of the insulation coating of the wire due to the galvanic isolation of the pickup generator and the controlled wire. To control the electrical conductor 1, coiled from coil 2, a generator 3 pickups of periodically varying electromotive force (EMF), unit 4 controls the period of induced electromotive force (EMF), speed sensor 5 of the wire, pickup coil 6, mounted. Also shown are an 8 point fault sensor, a high impedance amplifier 9, a defect length counter 10, a low frequency filter 11 and a defect number counter 12. 3 il. and

Description

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The invention relates to electrical measurements and can be used, for example, to control the quality of enamel insulation of wires during their manufacture and in the production of electrical winding products from them.

The aim of the invention is to increase the accuracy by taking into account the speed of movement of the wire and to simplify the quality control of the insulation of the wire coating due to the galvanic development of the Tangent of the pickup generator and the monitored wire.

Figure 1 shows the principal scheme of the device; 2 to 3, epgori that explain the operation of the device.

To monitor the electrical conduit 1 winding off the coil 2, a pickup generator 3 is used, with periodically varying electromotive force (EMF), the electromotive period control unit 4, the wire speed sensor 5, the pickup coil 6, mounted together with the controlled wire coil 2, on the magnetic rod 7, sensor 8 point faults, high impedance yci-shitel 9, counter 10 for the proof of defects, low-pass filter 11 and counter 12 for the number of defects ...

The sensor 8 point damage is connected to the input of a high-resistance amplifier 9, the output of which is connected to the meter counter 10 of defects and through the low-frequency filter 11 to the counter 12 of the number of defects. The sensor 5 speed of the wire is connected to the input of the control unit 4 - Lenin period induced emf, the output of which is connected to the generator 3 pickups of periodically varying emf. The output of the pickup generator 3, periodically varying emf, is connected to the pickup coil b. The coil 6 pickups mounted on the magnetic core 7 together with the coil 2 of the controlled wire. This makes it possible to realize an electromagnetic coupling between the pickup coil 6 and the test wire coil 2,:.

The control of the enamel wire is carried out as follows.

Generator 3 generates periodically varying time pulses that are emitted by the coil. 6 pickups. Due to the inductive and capacitive coupling between the pickup coil 6 and the coil 2 of the monitored wire in the latter, and therefore, in the wire 1, the EMF is periodically changing with time. Magnetic rod 7 serves to increase the EMF induced in the wire.

When the defect-free portions of the insulation of wire 1 pass through the sensor 8 point damage, no signal is received at the input of amplifier 9.

When passing through the sensor 8 point damage to the defective area of the insulation, the core 1 of the conductor through the contact point damage sensor

8 and input impedance amplifier

9 is connected to a common point (ground) which the generator 3 also has. Since there is an induced emf in the conductor, this emf is fed to the input of a high-impedance amplifier 9 and at its output an amplified EMF signal appears in the form of a series of impulses of induced emf (figure 2). This signal passes to the counter 10 of the defect extent, where the number of periods induced by the EMF is recorded. At the same time, this signal is fed to the input of the low-frequency filter 11 and at its output a pulse with a duration equal to the time of passage of the damaged section of wire insulation through a point damage sensor (Fig. 2, plot B) appears. This pulse arrives at the input of the defect number counters 12, where it is recorded. The number of pulses recorded by the counter during the control of the wire is equal to the number of defects on this wire.

According to the total number of induced emf periods recorded by the counter 10 of the defect length, and by the number of registered pulses in the counter 12, the length of the damaged sections of the wire insulation can be determined, which is a measure of its quality. If we denote the length of the defective area passing through one period of induced emf, through IJKS, the total number of periods recorded on the monitored wire through n, then the total length of all defective sections 1 is equal to

one,

 n .. 1.

p Figure 2 shows plots of induced emf obtained by pulling the same defective part

Weaving through a point damage sensor at different speeds.

Change the speed of drawing. Roving leads to substantial measurements in determining the extent of defects.

To prevent this from happening, in the control circuit of the generator 3 of the EMF pickup, there is a speed sensor 5 and Q block 4 for controlling the period of induced emf. The speed sensor 5 is mechanically connected to the monitored wire 1. As the speed of the wire 1 increases, the frequency of the induced 5 signal 5 increases. Signal from speed sensor 5 via control unit

4 period induced EMF enters the generator 3 and the coil 6 pickup .20

Thus, due to the presence of a speed sensor 5, the measurement result of the same defective area remains constant, no matter how fast the engine is moving.

wire (diagrams b). However, the number of registered periods and induced electromotive forces in counter 10 determines the length 1p. (formula 1) is inaccurate due to the neglect of .30 reaction of the sensor of damage points (the final extent of the sensor) to the defect. Suppose that an infinitesimal pinhole defect passes through the sensor of 8 point damage. During the passage of this section through the point damage sensor, counter 12 registers m pulses (w - induced emf periods, FIG. 3).

The apparentness of this infinitely small point defect in accordance with the expression (1) is equal to, (2)

The final length of the sensor introduces a systematic error in the determination of the length of defects and must be eliminated.

Let a defect of known extent pass through a point damage sensor .50

With the passage of this defect through. - through the sensor of 8 point damages in the counter 10, n pulses are recorded (plot 3),

The true extent of the 55 Ij defects, taking into account the false t pulses recorded by counting 10, is li (I .M (3).

With the passage through the sensor of 8 point damage K defects, the counter 10 registers the number of induced EMF periods equal to

P

 II P ;,

(four)

Where

P; - the number of induced emf periods recorded in the counter 10 when the i-ro defect is passed through the point-of-damage sensor, of length 1. The true extent of the damaged wire insulation, taking into account formulas 3 and 4, is equal to

to, 1 1 3, s tlln - km. (five)

i-t

Thus, in order to determine the true extent of the damaged insulation, it is necessary to record the total number of defects K with the net 12 of the number of defects and the number of periods of induced EMF during the time pro. of the defects K through the point damage sensor and counter 10 of the defects and the wire damage is determined by the formula

To determine the magnitude of the false hectares of induced electromotive forces recorded by the counter 10 of each defect, the device must be calibrated. To do this, two defects of strictly fixed magnitude 1 and 3 must be applied on the controlled wire.

For example, 1 1 mm and Ij 2 -mm. When a defect is damaged through the sensor through point 1, the counter 10 registers n, pulses, and when the defect is drawn, 14 n pulses. For these pulses, the following equations are true:

 1 WCT + ™

n 2 2n

ist

+ m

(6) (7)

where n; j. - the number of pulses determining the true extent of the defect. From these equalities it follows:

m .2n., - n J (8)

Claims (1)

Invention Formula A device for monitoring the quality of the insulation coating of the wire, which includes a point damage sensor connected in series and a defect count counter, is deprived of the fact that, in order to improve accuracy and simplify the control, a wire speed sensor, a generator pickups of periodically varying emf, unit for controlling the period of induced emf, low frequency filter, pickup coil, magnetic rod, amplifier, defect meter, and the output of the point sensor is damaged It is connected to the input of the amplifier, the output of which is connected to the input of the defect-length counter and to the input of the filter Low frequency filter, low frequency filter output is connected to the input of the defect amount counter, the output of the wire speed sensor is connected to an electromotive force period control unit, the output of which is connected to the input of the pickup generator with a periodically varying emf whose output is connected to the pickup coil, pickup coil and coil the monitored wire is placed on a magnetic rod, while the pickup generator with periodically varying emf and amplifier are grounded. Thebes. 2 Compiled by A.Korobkov Editor N.Gorvat Tehred M.Hodanich Proofreader S, Cherni Order 1312/45 Circulation 772 VNIISH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Fig.Z t Subscription