Electric (electromagnetic) temperature control device. Its main difference lies in the power-off signal sent by the thermostat, and it usually has a proportional characteristic. When the temperature of the measuring barrel is within a certain range above the set temperature value, the temperature regulator sends a signal to turn on the power supply of the electric actuator, and cut off the power supply of the heating system at the same time, so that the temperature of the barrel drops, and the temperature is adjusted within the set temperature range The rubber extruder sends a signal to turn on the power supply of the heating system and cuts off the power supply of the heating system at the same time, so that the temperature of the barrel rises. By repeating heating and cooling, the temperature value of the system tends to the set value, so as to realize constant temperature control.
In the early stage when the extruder adopts temperature control device, it usually adopts medium heating and pneumatic adjustment methods. Due to energy-saving, simple structure of rubber and plastic machinery and reliable operation, the traditional method is basically replaced by a combination of electric heating and solenoid valve adjustment.
Electric heating temperature control devices mainly include electric heating direct cooling open control, electric heating direct cooling closed control, electric heating indirect cooling closed control, electric heating direct cooling closed control, electric heating indirect cooling closed control, etc.
The circulation system is composed of a circulation pump, a water channel, an open water reservoir (equipped with a heater) and a filter. The water tank is equipped with a cooling water supply pipeline with a solenoid valve, and an overflow pipe is provided at an appropriate position in the water tank. When in use, the warm water of the water tank is fed into the waterway of the body by the circulating pump, and the body is heated to a constant temperature, so that the body temperature is compatible with the temperature of the warm water. At this time, the thermocouple in the circulating loop will detect the temperature of the circulating water and convert it into an electrical signal Enter the controller. When the measured temperature is higher than the set temperature, the controller will turn on the solenoid valve that controls the cooling water supplement, and cut off the heater's power supply at the same time, so that the water temperature will drop; when the measured temperature is lower than the set temperature, the controller The solenoid valve of the supplementary cooling water pipeline will be closed, and the heater's power supply will be turned on at the same time, so that the water temperature will rise, thereby increasing the water temperature of the circulation system. The constant temperature control of the extruder is realized through this continuous alternating process.
Temperature controller for rubber extruder.
The temperature control device of this machine has the characteristics of simple structure, reliable operation, low cost, low circulating water temperature of rubber extruder, generally lower than 95℃, etc., it is not suitable for extruders that require high temperature heating, but is suitable for general rubber extruders. The heating temperature. Because its circulation loop is open, its water temperature can only be lower than the evaporation temperature. If the temperature requirement is higher, a closed hot water circulating temperature control device is required to increase the circulating water pressure and increase the boiling point of the water, and its temperature can generally reach 130°C.
Extrusion equipment, cooling and heating systems, temperature sensors, pressure sensors, product size sensors, etc. With the development of extrusion equipment, the development of product size sensors, especially the introduction of computer technology, makes the extrusion equipment automatic The control level is greatly improved.