SU1359237A1 - Apparatus for controlling tension of web material - Google Patents

Abstract

The invention relates to devices for adjusting the tension of the tape material and can be used in various industries of the national economy when winding or unwinding from a roll, for example, paper, film, etc. The purpose of the invention is to increase the dynamic accuracy by enabling the motor to operate in the braking mode. A characteristic feature of the device. is that if roll 1 is overclocked, then the material tension has decreased, the input signal U .., the controllable transducer 9 is equal to U,., where and, Ug; U is the output of block 6 of the comparison; U is the signal at the output of the source 7 of the reference voltage, and E is the signal at the output of the tachogenerator 8. At the same time, Ug CO and the electric motor 10 goes into the generator mode, which shortens the transient process and increases the speed of the device. 3 il. with S (L SO eaten CD HS co-AND

Description

1135923

The invention relates to devices for adjusting the tension of a tape material and can be used in various sectors of the national economy when winding or unwinding from a roll, for example, paper, film and other materials.

The aim of the invention is to increase the dynamic accuracy by enabling the motor to operate in a braking mode.

FIG. 1 is a block diagram of the device; in fig. 2 - constructions

comparison unit; in fig. 3 - depending on is -U (, and their sum is -U ,,

The voltage bridge at the output of the unit. The voltage U. has a positive comparison.

polarity and a constant absolute value equal to the maximum absolute value Uj, (U (;), TeU 20) Adding the voltage Uj with the algebraic sum of the voltages Uj. and UR, we obtain a graph of the change for the yarn Ug, by the output of block 6 comparison, from which it follows: 25 ,, UE, O

The device contains a roll 1, from which the material is unwound with the help of pulling pulleys 2, skirting the roller 3. The tension device is a load 4, the tension sensor is selsen, 5, kinematically connected with roller 3. The output of selsyn 5 is connected to the first input of the comparator unit 6, the second input of which is connected to the source 7 of the reference voltage, and the output through the main winding of the tachogenerator 8 is connected to the input of the controlled converter 9 feeding the electric motor 10. In this case, the shaft of the electric motor 10 is kinematically connected and with in scarlet tachogenerator 8. Position 11 denotes the gearbox.

Comparison unit 6 is provided on transformers T, and Tj, the primary windings of which are connected to the outputs of selsyn 5, and transformer T, which is the source 7 of the reference voltage.

The device works as follows.

The voltage U at the output of the comparison unit 6 is determined by the algebraic sum of the three voltages, two of which are U (, and R (are removed from the resistors R, and Rj) depend on the output of the selsyn 5, and the third UR (is removed from resistor R) - from the voltage at the output of the transformer T., (source 7 of the reference voltage).

When the material is rolled up from roll 1, roller 3 changes its position depending on the strength of material. Moving roller 3 causes rotation of the selsyn shaft 5, at the output of which the signal is proportional to the actual tension of the fabric. Polnity

the stresses U and U are opposite, and their values depend on the rotation angle of the selsyn shaft 5. If the actual tension is equal to the nominal, the angle is oi 0 and U (and their sum is zero.

When the tension of the material changes in one direction or another from the nominal value, respectively, the selsyn shaft 5 is rotated in one direction or another.

When,, U, 0, a, their sum is equal to U (. When ot is with U, ((.

-U (, and their sum is -U ,,

polarity and a constant absolute value equal to the maximum absolute value Uj, (U (;), TeU,. Adding the voltage Uj with the algebraic sum of the voltages Uj. and UR, we get a graph of the voltage Ug, at the output of the block 6 comparisons from which follows: ,, UE, O

 , 5, U - + ,,, The voltage Ug from the output of comparison unit 6 is algebraically summed with EMF (E) proportional to the speed of roll 1, and then Ug-E is fed to the input of converter -9.

The magnitude and direction of the current 1 signal applied to the input of the trans. 9, depending on the ratio of the signals Ug and E.

Under normal tension

, U - ,, U, -Etr ().

In this case, the direction of the current in the tachogenerator is opposite to the direction of the EMF of the core.

If the roll slowed down, the tension increased, for example, then

Ue, 2U, -E ,, (UB, 0)

The input current increased while maintaining the same direction.

If the roll is accelerated, the tension is reduced, Ug –U ,, Ug –U, –E ,, (U, 0).

The input signal current reverses the direction, the current in the tachogenerator now coincides in direction with the EMF. It means that there is a change in the signal at the input of the converter both in magnitude and in direction, which makes it possible to transfer the electric motor to the generator mode. Due to this, the reduction of the motor speed in the process of regulation occurs with forced braking, which reduces the time of the transient process and increases the speed of the device.

Claims (1)

Invention Formula A device for adjusting the tension of the tape material, which contains a setting device and a material tension sensor, an output connected to the first input of the comparator unit, a tacho generator and a controlled transducer whose output is connected to a co 15 rem of the motor, kinematically connected with the axis of the coil, is so that in order to improve the dynamic accuracy by enabling the motor to operate in the braking mode, it is provided with a voltage source, and the tachogenerator shaft is kinematically connected to the shaft of the electric motor, the output of the reference voltage source is connected with the second input of the comparator unit, the output of which is connected to the input of the controlled converter through the main winding of the tachogenerator.  Fig.Z Compiled by B.Kisin Editor N.Gorvat Tehred M.Hodanich Proofreader L.Pilipenko Order 6109/23 Circulation 591. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, Projecto st., 4