Extrusion mechanism of plastic injection molding machine

Abstract

The invention discloses an extrusion mechanism of a plastic injection molding machine. The extrusion mechanism of the plastic injection molding machine comprises a material barrel, a screw rod, a motor, a thermocouple and an electric control device, wherein a charge port and a discharge port are formed in the material barrel; the screw rod is arranged in the material barrel, and driven to rotate in the material barrel by the motor; and the thermocouple is used for measuring the temperature of the material barrel. The extrusion mechanism of the plastic injection molding machine is characterizedin that cylindrical chambers parallel to the axial direction are distributed in the annular barrel wall of the material barrel; supports are arranged at the two ends of the material barrel separately; a quartz glass heating pipe is located in each chamber, and the two ends of each quartz glass heating pipe stretch out from the corresponding chamber; the two supports are connected with the two ends of each quartz glass heating pipe separately; a heat-isolation layer is installed at the outer side of the barrel wall of the material barrel; a heat discharge port is formed in the top of the heat-isolation layer; the heat discharge port is provided with a cover and a cylinder; the cylinder is capable of controlling the cover to cover the heat discharge port or being separated from the heat discharge port; and the electric control device controls the power supply of the quartz glass heating pipes and the working of the cylinder according to a signal of the thermocouple. The mechanism has the characteristics of being energy-saving and emission-reducing.

Description

technical field [0001] The invention belongs to a plastic injection molding machine, and relates to a mechanism for heating plastic raw materials to melt and extruding them by screw rods. Background technique [0002] When the extruder is working, the screw can continuously provide stable pressure to extrude the molten plastic raw material from the barrel. In order to make the plastic melt, the barrel needs to have a certain temperature so that the plastic is heated and melted during the advancing process. [0003] Chinese invention patent application 201210278450.8 discloses a gas heating device for an injection molding machine, which sends the heat source from a heat-absorbing fan to a heat conduction chamber through a heat transfer pipe, and the heat conduction chamber heats the screw barrel. [0004] Chinese invention patent application 201510366508.8 discloses an extrusion device for injection molding, which uses a heating cylinder to heat the feeding cylinder through a...

AI Technical Summary

Problems solved by technology

[0007] However, since the barrel itself is the carrier of heat, and the heat insulation material can prevent heat loss from the barrel, this will also have a greater impact on the control of the internal temperature

[0008] When the temperature exceeds a certain value, even if the heating element is stopped, the residual heat of the barrel can still make the internal temperature continue to rise. When the limit temperature is exceeded, the raw material will be burnt. Once burnt, it will cause waste and the barrel needs to be cleaned. Trouble

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