Precautions for the use of supersonic jet mill

In Industry News11/01/20225 Minutes

A supersonic jet mill is a machine that grinds large-sized solid materials to the required size. According to the size of the ground material or crushed material, the mill can be divided into a coarse crusher, a medium crusher, a fine mill, and an ultra-fine mill. There are four kinds of external forces applied to the solid during the grinding process: rolling, shearing, impact and grinding. Compression rolling is mainly used for coarse and medium crushing, suitable for the crushing of hard materials and bulk materials; shearing is mainly used for fine crushing, suitable for grinding tough materials; impact is mainly used for medium crushing, fine grinding and ultra-fine grinding, suitable for It is suitable for the crushing of brittle materials; the grinding is mainly used for fine grinding and ultra-fine grinding, suitable for the grinding of small pieces and fine particles.

The working principle of supersonic jet mill:

The compressed gas is passed through the feeding injector, and the grinding material is brought into the grinding chamber, and is sprayed tangentially to the grinding wall under the driving of the high-speed airflow from multiple nozzles to achieve the effect of friction grinding. The grinding fineness is controlled by adjusting the longitudinal depth of the grinding chamber, adjusting the grinding pressure or the feeding speed. Compared with the fluidized bed jet mill, the controllability of the grinding fineness is less, but it has a good grinding effect for materials with viscosity.

Features of supersonic jet mill:

1.  It is suitable for ultra-fine grinding of dry powder materials, with large impact particle size, which can reach Mach 2.5 or more, and general materials can be easily crushed to 1-10 microns.

2.  The relative fluidized bed jet mill has a good grinding effect on viscous materials, and the grinding process will not cause the phenomenon of blocking materials and unable to grind.

3.  No temperature rise, the temperature of the crushing process drops due to the compressed gas nozzle, and there is no mechanical friction process, so the crushing process will not heat up, and it is suitable for the crushing of heat-sensitive and low-melting materials.

4.  The equipment is simple, easy to clean, easy to operate and maintain, small footprint, low noise and no vibration.

5.  Less investment, according to customer needs, unnecessary equipment such as dust collectors, fans, control boxes, etc. can be eliminated.

Supersonic jet mill in use need to pay attention to these matters:

1.  During the production process, the temperature rise of the bearing must be checked frequently. When the temperature rise exceeds 50 °C, it should be stopped for inspection to find out the cause and eliminate the fault.

2.  When the new machine is running, the transmission belt is easy to stretch, and attention should be paid to adjusting the proper tightness of the belt to ensure the working life of the belt.

3.  The wearing parts should be checked frequently and replaced in time to ensure the production quality and production volume.

4.  The wear of the blade and the bushing should be checked frequently. If it is worn, the productivity will drop, and the particle size will become coarser. If it is worn, it will be replaced.

5.  The main engine and graded flow bearings are grease lubricated.

6.  The grease replacement period of the bearing is 2000 hours, and the filling amount of the grease is 1/2 (upper measurement) or 3/4 (lower measurement) of the space in the bearing cavity. Do not overfill the grease, otherwise it will cause the bearing. Temperature is too high.

7.  The grease changing period of the screw feeder is 4000 hours, add ordinary calcium-based grease.