SU773589A1 - Temperature controller for flongated moving objects - Google Patents

Description

one

This invention relates to automatic regulation and can be used to automatically stabilize the temperature of moving surfaces (ribbons, fabrics, paper and 5, etc.).

A temperature regulator of a moving tape material is known, which contains a source of hot air connected through a shut-off element to a tunnel kiln, and the drive input of the shut-off element is connected through a regulating unit to the output of the temperature sensor fl.

However, due to the low inertia 5 of the control channel (the flow of hot air — the surface temperature of the organic material), the amplitude and frequency of the oscillations of the surface temperature of the belt 20 increase significantly, which reduces the accuracy of the regulator. Increasing the frequency also reduces the actuator's executive organ (blower valve).

The closest in technical essence to the present invention is a temperature controller for extended moving objects, containing successively connected optical temperature sensor, measuring 30

bridge, power amplifier and slot heater 2.

The disadvantage of the regulator is its low accuracy, due to significant temperature deviations in the transient regulation mode, since the slot heater has significant inertia.

The purpose of the invention is to increase the accuracy of the temperature regulator for extended moving objects.

To achieve this goal, a temperature controller for moving extended objects, containing a series-connected optical temperature sensor, a measuring bridge, a power amplifier and a slot heater, contains a series-connected functional converter and an actuator kinematically connected with a slot heater, and the input of the functional converter is connected with the second output of the measuring bridge.

The drawing shows a functional diagram of a temperature controller for extended moving objects.

Claims (2)

The temperature controller for extensive moving objects contains series-connected optical temperature sensor 1, measuring bridge 2, power amplifier 3 and slot heater 4, as well as series-connected functional converter 5 and drive 6, the device operates as follows. At the beginning of the next cycle of movement of the heat-treatable material, the unbalance signal from the second resistive output, measuring bridge 2 is fed to the input of the functional converter 5. The amplified and converted signal from its output goes to the actuator 6, which through kinematic connection with the slot heater 4 changes it position relative to heat treatable material. At the same time, the maximum voltage is supplied to the slot heater 4 from the first (positional) output of the measuring bridge 2. A forced temperature output to the nominal level occurs. After the temperature reaches the nominal level, the stabilization of the latter is accomplished by sequentially connecting 4 nominal and low voltages to the slit heater. in the normal mode of operation of the system for stabilizing the temperature of the moving material, it is carried out only by changing the thermal state of the slit heater 4 at the same position of the latter relative to the heat treatable material. In the event of a disturbing effect (change in the material speed) that causes, for example, an increase in the temperature of the moving material, the output of the functional converter 5 sends a signal to the actuator 6. The latter changes the position of the gap heater 4 relative to the moving material, so that the length of the heat treatment zone. At the same time, from the output of the power amplifier 3, an undervoltage is connected to the slit heater. Thus, the compensation of the arising deviation of the controlled temperature due to the action of the perturbation is carried out simultaneously by changing the thermal state of the slit heating of the body 4 and the position of the latter relative to the heat-treating material. Since the inertia of the content channel of the functional converter 5 and the drive b is relatively small and is determined mainly only by the speed of the latter, it is given to form the return of the controlled temperature to the nominal level when it goes up τ of the nominal value. The inertia of this device through the channel (the power supplied to the slot heater 4, its temperature) is considerable and more than an order of magnitude greater than the inertia of the drive 6. Therefore, during the disturbance compensation time, the thermal state of the slot heater 4 changes slightly and this excludes the effects of delaying the transient process and an increase in the amplitude of fluctuations in the temperature of the material in the normal mode. The system works in a similar way when the controlled temperature deviates downwards from the nominal value (an increase in the velocity of the material). When using the proposed control system, the scrap of output is reduced by almost 40% by reducing the amount of material going to manufacture the product with a temperature lower than that specified at the beginning of the next cycle of movement, as well as by improving the accuracy of stabilizing the surface temperature of the tape in normal operation of the system .. Claims of the Invention A temperature controller for extensive moving objects, comprising a series-connected optical temperature sensor, a measuring bridge, will amplify l capacity and slit heater, characterized in that, in order povmeni precision regulator, it contains a series-connected function generator and a drive kinematically coupled with a slit heater, wherein funktsionalrogo input transducer connected to the second output of the measuring bridge. Sources of information taken into account in the examination 1. Patent SHE number 3552645, cl. 236-15, 1971. 2. Guzii, V. G., Toldin, V. P., et al. Automatic stabilization of the temperature of moving materials during their heat treatment. Elements and technical means of control and regulation, Vol. 324, Novocherkassk, 1976 (prototype).