SU922191A1 - Apparatus for stabilizing the edge of carrier belt at forming film webs - Google Patents

Description

I.

The invention relates to devices for controlling the process of forming film materials.

A device is known for stabilizing the edge of a carrier tape during the formation of film materials, comprising a sensor for the edge of the tape associated with the controller, converters connected by means of an actuator with an actuator tn.

A disadvantage of the known device is the low stabilization accuracy when changing the molding speed.

The aim of the invention is to improve the accuracy of stabilization.

This goal is achieved by the fact that the device has a feedback sensor associated with the actuator, and the controller consists of a proportional link, two shift repeaters, throttles, two comparison elements, and the output of the proportional link is dinene with one of the inputs the first repeater and with the first comparison element, the output of the first repeater is connected via drossel to one of the inputs of the second comparison element, and the feedback sensor is connected to one of the inputs of the second repeater and to the second element ntu comparison, while the output of the first repeater is connected to another input

to the second element of the comparison.

The drawing shows a diagram of the device.

The device contains a drying chamber 1, the conveyor 2 (carrier

Claims (2)

15 tape), liquid polymer 3 filter, drum 5 sensor 6 superposing the edge of the carrier tape, regulator 7 setpoint 8, repeaters 9 and 10 with shift, choke 11, elements 12 and 13 of comparison, converter And, starter 15, actuator 16, the feedback device sensor 17. The device works as follows. A flat film is formed by feeding a liquid polymer 3 through a die plate 4 onto an endless carrier metal strip. 2. When moving along the conveyor along the drying / i chamber 1, the liquid polymer solidifies as a result of physicochemical transformations. The position of the edge of the tape is determined by the position sensor 6. The signal from the sensor is fed to the controller 7 where it is compared with the one specified by the setting device 8. The controller 7 generates the control signal P (t) determined by the algorithm of the control unit 7 (PI, PIL). P (t) 0Pri (t) - ej PRK & g, where FR is the operator of controller 7. In the initial position, when the pressure of the parameter P and the task Rd are equal, the pressure Paujy from the output of block 7 and the feedback pressure Rd, post The 12 and 13 dpa elements entering the inputs are within the dead band and, as a result, there is no pressure at the outlet. With the help of repeaters 9 and 10 with a shift, the shift of the variables P and PQ, arriving at the input of the three-position relay, ya, is established. constant C to form a dead zone. The dead zone is necessary to prevent the simultaneous operation of the elements 12 and 13 of the comparison. If misalignment occurs between the task and the parameter dR P j, the pressure Pg, at the output of block 7 instantaneously changes to the value, where k is the transfer coefficient of the regulator 7. If the value of khdR exceeds the sensitivity zone of the comparison element C, one of comparison elements (element 12 or 13, depending on the sign of the deviation of the parameter) and at its output, pressure Pp (or PPQ.) is applied, which in 4 4 leads to the inclusion of an integral actuator. At the same time, the feedback pressure from the actuator begins to change in the same direction as the change in pressure at the output of block 7. This continues until the change in feedback RDS value becomes equal, i.e. until the actuator operates a regulating action proportional to the deviation of the Parameter from the task. Apparatus of the invention for stabilizing the edge of a carrier tape when forming film materials, comprising a belt edge sensor associated with a controller, converters coupled by an actuator to an actuator, characterized in that, in order to improve the stabilization accuracy when the molding speed is changed, It has a feedback sensor linked to the actuator, and the regulator consists of a proportional link, two repeaters with a shift, throttles, two comparison elements, and the output is the proportional link is connected to one of the inputs of the first repeater and to the first comparison element, the output of the first repeater is connected via drossel from the inputs of the second comparison element, and the feedback sensor is connected to one of the inputs of the second repeater and to the second comparison element, while the output the first repeater is connected with another input of the second element of the comparison. Sources of information taken into account during the examination 1, USSR Author's Certificate No. 603627, class B 65 N 23/02, 1978.