SU1748100A2 - Device for checking insulation resistance of moving cable ware - Google Patents

Abstract

The invention can be used to control the level of insulation resistance of cable products with plastic and rubber insulation during their manufacture. The aim of the invention is to improve the accuracy of the control. The invention is additional to the author. St. No. 1247794, in which the device comprises a screw press, on which an insulated wire is manufactured, a length meter, a measuring electrode, a receiving unit, a voltage source, a current meter, a proximity switch and a measuring unit. For improvement, the device is supplemented with a casting block and an adder. 1 il.

Description

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The invention relates to a measuring technique and can be used to control the level of insulation resistance of cable products with plastic insulation, in particular in the manufacture of insulated conductors and wires, and is an improvement of the device according to the author. No. 1247794.

The known device comprises a screw press on which an insulated wire is manufactured, a length meter, a measuring electrode, a receiving unit, a measuring voltage source, a current meter, for example a digital multi-voltage meter, a proximity switch.

The disadvantage is known about the device - its low accuracy is due to the fact that the sum of the measured current values through the insulation in each group is compared with the specified current value through the insulation, i.e. by the value of the current of some group, the insulation resistance of the product as a whole is judged.

The aim of the invention is to improve the accuracy of monitoring the insulation resistance of a two-piece cable product.

The goal is achieved by the fact that the device additionally contains a casting unit and an adder, while the block outputs of the number of sections of current groups below the base level of currents are connected to two inputs of the casting block, to the third input of which is connected the second output of the reference block of the baseline current levels connected to the first input of the adder, to the second input of which the second output of the reference block of sections of the base current level is connected, and the output of the adder is connected to the comparison block.

The proposed device compared with the known has the following distinctive features

- cast block;

-adder;

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The outputs of the counting blocks of the number of sections of current groups below the base are connected to two inputs of the casting unit.

- a second output of the reference block of sections of the base level of currents is connected to the third input of the casting unit;

- the output of the cassette unit is connected to the first input of the adder;

-to the input of the adder is connected to the second output of the block of reference sections of the base level of currents;

The output of the adder is connected to the comparison unit.

The implementation of the proposed device makes it possible to increase the accuracy of monitoring the insulation resistance of a moving cable product, which is achieved by reducing the numerical values of the third, fourth, and subsequent levels of control to the second basic level.

The drawing shows a block diagram of the proposed device for implementing a method for monitoring the insulation resistance of a moving cable product.

The device for controlling the insulation resistance of a moving cable product contains a worm press 1, on which an insulated wire is manufactured, a length meter 2, a measuring electrode 3, a receiving unit 4, a voltage source 5, a current meter 6 (digital ampere-voltmeter), a contactless switch 7. The first output of the current meter b is connected to the program counter 8, counting clearly defective parts, the currents of which are 1–2 or more times higher than the base current (burnouts, punctures, insulation cuts).

The second output of the meter b is connected to the program counter 9, counting the number of sections with the current of the second base level of control. The remaining outputs of the current meter b are connected, for example, to program counters 10 and 11, counting the number of sections with currents of the third and fourth control levels, respectively. The number of software counters, depending on the number of monitored levels of currents in the sections, may be more or less accepted for consideration of four-level control.

The output of the software counter 8 is connected through the alarm unit 12 to the block 13 of the stop. The first output of the software basic counter 9 is connected to one of the inputs of the comparator unit 14, its second output is connected to one of the inputs of the adder 15 and the coercion unit 16. The outputs of the program counters 10 and 11 are connected to the inputs of the casting unit 16, and its output

- to one of the inputs of the adder 15, the output of which is connected to the second input of the comparator unit 14. The output of the latter is connected to the block 13 stop through the block 12 alarm. The output of the block 13 stop is connected to the screw press 1.

After the screw press 1, the product passes through the meter 2 lengths, the number of revolutions (for example, 3) of the measuring rollers

which corresponds to a certain length of the section of the product (for example, 1 m). When passing through the meter 2, the length of the section of the product with a length of 1 m from the output of the block 7, the electric signal is fed to the remote start input of the current meter b. From the output of the current meter b, if the measured current value is 2-3 orders of magnitude higher than the (specified) base current level, which corresponds to a clear defect (burnout, puncture, cut

isolation), the electrical signal through the counter 8 enters the alarm unit 12 and further, through the block 13 stops to the screw press 1.

From the output of the current meter 6, an electrical signal about the numerical value of the sections with the current of the second baseline control level is fed to the program counter 9. The electrical signal from the other outputs of the current meter 6, if the measured values of the currents are

parts of the product correspond to the third or fourth level of control (for the adopted example), goes to program counters 10 and 11, respectively, which count the number of sections of the product with the indicated current levels.

The reduction of the numerical values of the sections of the third, fourth and subsequent levels of control to the second basic level is carried out in block 16 until the sum of the numerical values of the sections of the third and fourth levels of control is reached.

a number which is defined as pz

П P4 Tj, respectively (where bi, 02, з 3 b, the reduction ratio of the insulation resistance of the section from the permissible for the first, second, third, fourth control levels is possible).

For example, with bi 1000; B 100; Lz 20; B4 5 as soon as the numerical values of the plots of the third and fourth levels

trol reach values pz t-

B2 100

 20 respectively, in

  , in block 16, the input data is reset (pz or gm) from counters 10 and 11 to zero with simultaneous reading

an adder 15 of a pulse unit, in its significance corresponding to the passage through the electrode of one section with current through its insulation acceptable for the second basic level of control.

After each reset of the readings of the counters 10 and 11 to zero, the counting of the subsequent numerical values of the sections of the third or fourth levels of control begins in a new way. The pulses received in block 16, after each reset of the counters 10 and 11 to zero, are counted by the adder 15 and added to the current value of the number of sections of the second basic control level received from the second output of program counter 9, and this sum is compared to a valid numerical value The area of the second basic control level, which is fed to the first input of the comparison unit 14 from the first output of the program counter 9.

In case of exceeding the numerical values received at the second input of the comparison unit 14, the sections from the reduction block 16, the allowable numerical value of the sections from the first output of the program

counter 9 triggered blocks 12 and 13 alarm and stop.

The proposed device makes it possible to combine the operation of insulating the insulation resistance of a product with the manufacturing operation, to increase the accuracy of monitoring the insulation resistance by detecting and counting sections with currents above the specified ones.

Claims (1)

Claims of Invention A device for monitoring the insulation resistance of a moving cable product according to the author. St. No. 1247794, characterized in that, in order to improve the control accuracy, it additionally contains a casting unit and an adder, while the outputs of the counting blocks of the number of sections of current groups below the base current level are connected to two inputs of the casting unit, to the third input of which the second output is connected block of reference sections of the base level of currents, the output of the block of the reference block is connected to the first input of the adder, to the second input of which the second output of the block of reference sections of the base level of currents is connected, and the output of the accumulator is connected to the block Neni.