Freeze grinding system

Abstract

The invention provides a freeze grinding system which is of a closed loop circulation structure. Liquid nitrogen is used for cooling the system through a precooling bin of a liquid nitrogen vaporizer so that the use cost of the whole system can be low; it can be ensured that the temperature in the system ranges from minus 160 DEG C to minus 180 DEG C and the temperature of a grinding cavity of an air flow grinding machine is minus 120 DEG C or lower; and materials are thoroughly embrittled, and thus grinding of the materials is ensured. The freeze grinding system comprises an air compressor and the air flow grinding machine. A material bin is arranged at a feeding port of the air flow smashing machine, and compressed air of the air compressor is communicated to an air inlet of the air flow smashing machine. The freeze grinding system further comprises a liquid nitrogen storage structure; an outlet of the liquid nitrogen storage structure is connected to an inlet of the liquid nitrogen vaporizer; an outlet of the liquid nitrogen vaporizer is connected to an inlet of a first storage tank; an outlet of the first storage tank is connected to an inlet of an air path distributor; an outlet of the air path distributor is communicated to the material bin; an outlet of the air flow grinding machine is connected to a cyclone separating device; a material outlet of the cyclone separating device is communicated to a discharging barrel; and an air outlet of the cyclone separating device is connected with a dust removing device.

Description

technical field [0001] The invention relates to the technical field of material crushing, in particular to a cryogenic crushing system. Background technique [0002] The crushing mechanism mainly applicable to the jet mill determines its wide application range and high fineness of the finished product. The existing cryogenic crushing system uses a turbine to cool down and boost the temperature. The cost of turbocharging and cooling is high, and the low temperature cannot Reaching below -160°C, the use cost is high for the crushing process of strong fibers, viscous, tough polymers and other materials, and the gas flow direction of the existing cryogenic crushing system is an open structure, so that in the actual use process, Low-temperature gas needs to be continuously generated, which makes it difficult to control the minimum cooling temperature, which in turn makes the cost of the entire use high. Contents of the invention [0003] In view of the above problems, the pres...

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Problems solved by technology

[0002] The crushing mechanism mainly applicable to the jet mill determines its wide application range and high fineness of the finished product. The existing cryogenic crushing system uses a turbine to cool down and boost the temperature. The cost of turbocharging and cooling is high, and the low temperature cannot Reaching below -160°C, the use cost is high for the crushing process of strong fibers, viscous, tough polymers and other materials, and the gas flow direction of the existing cryogenic crushing system is an open structure, so that in the actual use process, Low-temperature gas needs to be continuously generated, making it difficult to control the minimum cooling temperature, which in turn makes the cost of the entire use high

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