Technical conditions in process of grinder mill

Technical conditions in process of grinder mill

Simplified grinder mill cracking is generally caused by two reasons: the first is of poor quality welding itself or simplified quality does not meet the requirements of steel, bending strength is not enough, fatigue fracture; second is to improve the production process, after loading the mill , so that the force plate over simplified design specifications, or other reasons caused by overload breakage or cracks simplified. There may be due mill Simplified internal stress caused by temperature changes greater damage. Some mills use a longer period, as simplified in severe wear of individual parts, can also cause Simplified strong enough, cracks.

Processing methods are:

(1) cleaning cracks at the plate, find the cracks of the two endpoints at the endpoints of the 5 ~ 6mm drill a hole, make up the hole, avoid the cracks continue to extend.

(2) air gun or splitting cracks inside and outside the arc gas cutting steel on both sides of the triangular slot labeled 60o order to reduce barrel distortion, double bottom groove may be separated by 2mm, not to big to get through.

(3) use 41 electrodes (or other appropriate grade of welding rod) Bake in oven 250 ℃, removed immediately after the inner wall of the triangle in the simplified two-tier operation in the welding and the outer wall of the simplified triangular groove weld full line.

(4) welded on the cylinder wall to the two split off and re-welded full.

(5) If the crack is too long to be sub-welding.

(6) use of simplified due to years of wear and cracks, repairs on the tube should be wrapped in the original layer of 16 ~ 20mm (steel tube should be considered the original thickness) steel plate, steel mill itself along the axis of The interface uses a single-sided welding of steel plates connected with rivets and simplified along the edge of riveting steel plates on both ends of 2 to 3 weeks, disable welding, or take the boundary of the weld was easy to crack.

In the mill output, quality is normal, the end of a small amount of grain mill discharge is normal, but if there is a lot of particles broken segment, it may be due to a warehouse filled with a large factor too much more than two positions (two positions grinding), or every board positions with a hole in the diaphragm plate installed between the diaphragm plate gap is too large a position in the larger particles of material went to the two positions, while the two positions can not be broken because the smaller grinding media to the end of discharge from the mill.

Mill grinding the material should meet certain technical conditions

Currently used in the domestic cement grinding media generally poor quality of every production of 1t of cement consumes 1.2 ~ 1.3kg grinding, some even up to 2kg, for the advanced level of 30 to 50 times because the ball materials are generally been heat-treated low-carbon steel or medium carbon steel, its plasticity, toughness is more than the strength, hardness is low, so, wear quickly and the plastic deformation, the surface of burrs, which stick material, resulting in over-grinding, impact on yield, quality .

Grinding the material requirements, the technical conditions should be: carbon content> 0.4% of the ordinary carbon steel, quality carbon structural steel, alloy steel carbon content of 2.1% of cast iron, alloy cast iron, etc., after processing, its Rockwell hardness should be greater than 50 (HRC ≥ 50). for processing by a variety of steel grinding media, the microstructure of hardened layer must be martensite carbide, cast iron or martensitic microstructure should be Choi's body + carbide. hardened layer depth of not less than 10mm.

 

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