SIMULATION SYSTEM OF MULTI-ZONE TEMPERATURE CONTROLLING SYSTEM AND METHOD FOR IDENTIFYING CHARACTERISTIC PARAMETER

摘要

PURPOSE:To establish a temperature controlling system with few errors by a method wherein the cylinder, head and die of an extruder are divided into a plurality of zones and a heater and a temperature sensor are provided in each zone and the heat balances of zones are specified in a simulation system equipped with a computer system, which processes temperature measuring signals sent from temperature controllers connected to respective zones. CONSTITUTION:A plurality of cast-in aluminum heaters 2 are wrapped round an extruder cylinder 1. The temperatures of the cylinder 1 are detected with temperature sensors 3, which are imbedded in the cylinder 1, and transmitted to temperature controllers 4 and transferred through a signal distributor 15 in the form of communication signals in a computer system, which consists of an input-output interface 16, a CPU 17, a memory 18, an operator panel 19 and an indicator panel 20. When let the heat capacity of each zone of a multi-zone temperature control system be Ci(kcal/ deg.C), the calculating period be DELTAt, the amount of temperature change in a time DELTAt be DELTAxi, the heat quantity supplied from the heater be Qi(kcal/h), the coefficient of heat dissipation to environs be alphai(kcal/h deg.C), the representative temperature of each zone be xi( deg.C), the ambient temperature be xa( deg.C), the coefficient of heat flow between zones adjacent to each other be lambdai(kcal/h deg.C), the heat balance of each zone is set to be represented by the basic formula 1.