Hopper drying device, plastic raw material drying method and multi-stage material drying machine

Abstract

The invention discloses a hopper drying device. The hopper drying machine comprises a drying container, a heater and a gas driving device which are sequentially connected to one another through a pipe to form gas circulation; a dry gas inlet and a wet gas outlet are also formed in the pipe; and the dry gas inlet is connected with a dry gas source. The invention also provides a plastic raw material drying method and a multi-stage material drying machine. The gas circulation is formed by using the drying container, the heater and the gas driving device, so that most of drying heat energy in a whole circulation process can be recycled; dry gas is fed in the hopper drying device, the outlet is formed in the hopper drying device to discharge wet gas, and the drying speed is increased by using the dry gas; and repeated circulation of the wet gas is reduced by discharging the wet gas, energy consumption on drying of raw materials is reduced, the drying quality of materials to be dried can be high, drying time is short, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of drying devices for raw materials of injection molding machines, and specifically refers to a hopper drying device, a drying method for plastic raw materials and a multi-stage drying machine, which are suitable for granular or powdery raw materials such as plastics and powder metallurgy materials. Drying of solid particles. Background technique [0002] In the injection molding process, due to insufficient drying of granular or powdery raw materials, it will cause bubbles, silver streaks, flow marks and other undesirable phenomena in the product. Therefore, in the injection molding process, the granular or powdery raw materials are generally added to the storage barrel of the dryer, and after being dried by the dryer, the raw materials are sent to the hopper of the injection molding machine through the transmission channel of the dryer. In the process, when the injection plunger retreats, the raw material...

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Problems solved by technology

The above-mentioned hopper drying device has the following defects: the heated air is discharged from the hopper at the same time during the heating process, and the hot air is not recycled. This method will lead to a longer drying time and waste unnecessary electric energy

[0004] The invention patent application with application number 201310260910.9 discloses a hopper drying device, the drying device includes: a hopper, a hot air blower, a filter is arranged above the hopper and connected to the hopper, and the lower side of the hopper is connected to There is one end of the first air pipe, the other end of the first air pipe is connected with the air outlet of the hot air blower, the air inlet of the hot air blower is connected with one end of the second air pipe, and the air inlet of the second air pipe is connected The other end is connected with a dehydration device, and the dehydration device is connected to the filter through the third air pipe. The hopper drying device with the above structure recycles hot air to improve drying efficiency and save electric energy, but its entire cycle process is wet The air is exhausted through a complex dehydration device, resulting in high energy consumption for plastic drying

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