Temperature regulator of temperature regulating part under hopper of injection molding machine

A temperature regulator of a temperature regulating part under a hopper of an injection molding machine, comprising:

• a fan attached to a motor for cooling a cooling medium;
• a radiator facing the fan;
• a tank for storing the cooling medium;
• a pump for circulating the cooling medium;
• and
• cooling medium circulating paths provided with a valve for switching the circulating paths so that the cooling medium can circulate through the temperature regulating part under the hopper or through a bypass circuit, the valve for switching the circulating paths being controlled by a control signal from a controller of the injection molding machine, where
• the temperature detected by a temperature sensor arranged in the temperature regulating part under the hopper is fed back to the controller of the injection molding machine;
• and
• when the injection molding machine is in an ON state and a heater control of a heating cylinder of the injection molding machine is also in an ON state, the valve for switching the circulating paths for the cooling medium is controlled by the control signal from the controller of the injection molding machine so that the temperature of the temperature regulating part under the hopper becomes equal to the preset temperature.