JPS5924493Y2 - Injection molding machine quenching device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a quenching device for an injection molding machine that molds a thermosetting resin or a thermoplastic resin with poor thermal stability.

The resin in the heating cylinder of an injection molding machine is first supplied from a hopper, etc., and then transferred to the front (
(in the direction of the nozzle).

During this time, the resin is melted by receiving heat from a heating device provided on the outer surface of the heating cylinder or by frictional heat due to rotation of the heating cylinder, and is controlled to maintain a constant temperature by a temperature control device.

However, if the resin in the heating cylinder is a thermosetting resin or a thermoplastic resin with poor thermal stability, if the resin in the heating cylinder is a thermosetting resin or a thermoplastic resin with poor thermal stability, the resin in the heating cylinder may remain in the heating cylinder for a certain period of time when the machine stops operating due to some kind of accident or when the molding operation ends. Because of the residual heat from heating cylinders, screws, etc., hardening reactions and decomposition occur.

This makes it impossible to restart the machine in the case of hardened resins, and in the case of resins with poor thermal stability, the gas from decomposition may cause corrosion of the screws and cylinders. When the heating cylinder stops, it is normal to quickly clean the nozzle, screw, etc. so that no resin remains inside the heating cylinder.

This is very troublesome and is likely to damage the nozzle, screw, etc.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to prevent the resin from thermally curing or thermally decomposing inside the heating cylinder even when the machine stops operating.To describe this invention in more detail, A quenching device using liquid or compressed air as a refrigerant is installed in the heating device of the heating cylinder, and when the machine stops operating and a certain period of time has elapsed, the refrigerant flows through the quenching device to rapidly cool the heating cylinder. This is a device designed for

Next, referring to FIGS. 1 and 2, a heating cylinder 1 is heated by a plurality of heaters 2. In FIG.

Reference numeral 3 denotes a cooling jacket into which a cooling liquid, compressed air, or other fluid is introduced from a fluid source 4 via an electromagnetic on-off valve 5 as shown by the arrow, and can be circulated.

As shown in the electrical development diagram in FIG. 2, the electromagnetic on-off valve 5 operates when the timer 6, which is set to operate after a predetermined period of time has elapsed after the operation of the machine is stopped, times out, and the relay 7 operates. The contact point 7A is connected, the solenoid 8 of the electromagnetic on-off valve 5 is energized, and the circuit from the fluid source 4 to the cooling jacket 3 is opened, allowing fluid to flow into the jacket 3.
It now circulates inside cylinder 1 and screw 9.
is cooled.

Therefore, the drawbacks listed at the beginning are eliminated, and thermal curing and thermal decomposition do not occur due to the heat remaining in the heating cylinder 1 and the screw 9. Furthermore, 10 is a valve for adjusting the flow rate, and the valve 10 is a valve for adjusting the flow rate, This adjusts the amount of cooling fluid introduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an electrical development diagram thereof.

Claims (1)

[Scope of utility model registration request] In a heat supply section provided with a temperature control device divided into a plurality of groups on the outer periphery of a heating cylinder of an injection molding machine, a cooling fluid such as a liquid or compressed air provided in the heat supply section of the plurality of groups is introduced. A jacket, a cooling fluid circulation circuit connecting the cooling jacket and the cooling fluid source, and a timer provided in the circulation circuit and activated when a predetermined time has elapsed after the injection molding machine has stopped operating. A quenching device for an injection molding machine that avoids the solenoid on-off valve that opens the circulation circuit.