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Main features of screw feeder


Spiral feeder can be used primarily in pharmaceutical, food, chemical, plastic, new energy and other industries. It is a more advanced and professional material delivery tool. The whole transportation process is completely closed, which can effectively prevent dust leakage caused by traditional feeding forms such as manual feeding. It is a reliable choice for cleaner production to reduce workers'labor intensity.

The screw feeder has the following characteristics:

In accordance with GMP requirements, 304/316L stainless steel is selected.

Strong transport capacity, fine polishing of the inner wall, non-bonding materials.

Unique S-shaped flanging structure to prevent dust leakage. Powder weighing

Hygienic and clean, selected and corrosion resistant materials.

Intelligent control, simple operation.

Building block structure, all can be disassembled by hand, no dead corner, easy to clean.

Light weight, small volume, low noise and no sensation.

Economical and energy-saving, low operating costs.



Heat Treatment Characteristics and Microstructure and Properties of Die Steel for Spiral Feeder

Like other alloy tool steels, the heat treatment of screw feeder includes pre-heat treatment of spheroidizing annealing and final heat treatment of quenching and tempering. The final heat treatment is carried out after processing and forming. After heat treatment, the die has reached a high hardness and can only be grinded and trimmed. There are two heat treatment methods for hardness of advanced alloy cold working die steel. Automatic metering system

(1) Low quenching temperature and low tempering temperature are selected for primary hardening treatment. For example, Cr12 steel is quenched at about 980 C, and tempered at 160 180 C after screw feeder. Its hardness can reach 61 63 HRC. This treatment makes the die of screw feeder have better wear resistance and toughness, and less quenching deformation. Therefore, this method is used for all the moulds that bear large loads and have disorderly shapes.

(2) Higher quenching temperature and repeated high tempering are selected for secondary hardening method. For example, Cr12 steel is quenched at 1050-1100 ~C. The hardness of quenched steel is lower, 40-50HRC. This is because there is more austenite left. If tempered 2-3 times at 510-520 C, secondary hardening will occur, the hardness will increase (up to 60-62 HRC), and the hardness will advance. Because of the higher quenching heating temperature, the screw feeder has bigger grain drawing and slightly worse toughness than the former method. Therefore, this treatment method is mainly applicable to the die which is subjected to severe wear and must be hot and hard when it is operated at 400-500 C.

After spheroidizing annealing, the structure of high chromium cold working die steel for screw feeder is spherical pearlite and uniformly distributed calibrated carbide with hardness of 207-255 HRS. After quenching and tempering, the structure is tempered martensite, granular carbide and a few remaining austenite, and the hardness generally reaches above 60HRC.

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