CN103240151A - Grinding body - Google Patents

Abstract

The invention relates to a grinding body which is of a regular tetrahedron shape. Edges of the regular tetrahedron and vertex angles are all subjected to arc surface transition treatment, so that planes are in arc surface transition connection. The grinding body provided by the invention and a cylinder body a ball grinder have less relative sliding, so that lifting height is large, throwing area is large, an impact effect is high, and a grinding effect is intensified; the grinding body can generate various contact and impact effects in point, line and surface types, improves the grinder energy utilization ratio, is large in specific surface area, has great frictional force with materials, has a great grinding effect on materials, and has good grinding efficiency.

Description

A kind of abrasive body

Technical field

The present invention relates to a kind of abrasive body, specifically relate to a kind of for the abrasive body at the milling apparatus grinding material.

Background technology

The grinding of clinker is very big to the benefit influence of cement production enterprise, concerns cement production consumption and cement performance two big important indicators.For a long time, the countries in the world scholar is devoted to study energy consumption and the protection ecological balance that reduces in the cement pulverizing course always, thinks that this is an important and long-term task.At present, in the production of Chinese cement industry, ball mill is still occupied an leading position, and the selection of grinding in ball grinder body is the focal issue that domestic and international producer pays close attention to and disputes on for the influence of aspects such as grinding effect, energy consumption and abrasion always.

The thirties in 20th century, the Fan Er Hart carries out parallel contrast test with cube with the spheroid medium in industrial mill, and the result shows that under the feed condition identical with Granularity Distribution the unit ball of cube medium consumption and specific energy consumption are better than ball medium.Canadian Yue Kasi result of the test in 1980 thinks that the truncated cone-shaped medium is better than spherical medium.Domestic grinding worker has also carried out some tests and research to the shape and size of abrasive body, draws the conclusion similar to the foreign scholar.Cement plant, GuangZhou, Guangdong Province Φ 2.4m * 12m wet raw mill for example, because the partition panel between the II, III storehouse damages, the grinding state that has caused ball, section to mix, grinding machine still can ordinary production, just find this phenomenon up to the grinding machine maintenance in the 1950's.This is special-shaped abrasive body---the birth of " post ball " provides practical basis.Ball, section mixing measure have been adopted at Φ 0.92m * 2.83m raw mill in cement plant, Dongshan, Guangdong Province 1970, and mill efficiency has improved about 60%.This has confirmed that further " post ball " can strengthen grinding effect.Hefei Cement Research Design Institute once carried out subject study to special-shaped abrasive body in the nineties in 20th century, had obtained the result who improves mill efficiency equally.

In the tradition abrasive body, the spherome surface shape is level and smooth everywhere, and intensity height, isotropism, is subjected to the frictional force minimum during motion.Yet in all isopyknic solids, the specific area minimum of spheroid.Studies show that, suitably increase specific area and reduce intensity, be conducive to the raising of mill efficiency.For forging (cylindrical), to compare with the spheroid of equal volume, the specific area of forging is than ball big (draw ratio of forging is greater than 1).But conventional forging intensity is always than spherical aberration, forges simultaneously two ends to have crest line, so the surface configuration of forging is not level and smooth everywhere.Practice shows, and is the fastest in crest line place, the two ends wearing and tearing of forging.Therefore, the abrasive body that forging neither optimum shape.

Summary of the invention

The purpose of this invention is to provide a kind ofly possess ball, forge abrasive characteristic, specific area is big, mill efficiency is high New Grinding Media, with further reduction cement grinding energy consumption, improve cement grinding efficient.

Grinding media shape provided by the invention is positive tetrahedron, and the seamed edge of described positive tetrahedron and drift angle be all through the cambered surface transition processing, makes that the cambered surface transition is connected between plane and the plane.

In grinding process, abrasive body to the abrasive action of material be rely between abrasive body and cylindrical shell, relative slip between abrasive body and abrasive body and produce shearing to material, material is then ground under this shearing action.Obviously, the generation of this shearing is relevant with the surface area of abrasive body, and the surface area of abrasive body is more big, and the shearing that produces is more many, and is just more strong to the abrasive action of material.In addition, abrasive body is subjected to the influence of hoisting depth to the percussion of material.Under the certain situation of drum speed, liner plate form and material and abrasive body material, the hoisting depth of abrasive body is relevant with its specific area.As the circular groove slot liner plate of having succeedd, be exactly to utilize the touch opportunity that increases between liner plate and abrasive body, and reach the purpose of hoisting depth.So increasing the abrasive body specific area under certain condition, is to improve the effective way of mill efficiency.

By mathematical theorem as can be known, any protruding multiaspect is long-pending all big than the ball surface area with volume, so the shape of abrasive body should be carried out in convex polyhedron preferably.For making the grinding media shape comparison rule, be convenient to processing and manufacturing again, grinding media shape is selected and should be carried out in the regular polygon scope.So-called regular polygon is exactly the convex polyhedron that each face all is made of identical regular polygon.By about the characteristic of the Euler's theorem of convex polyhedron number of vertex, rib number and face number and regular polygon as can be known, regular polygon has only positive tetrahedron, regular hexahedron, regular octahedron, regular dodecahedron and regular dodecahedron etc.The surface area of the regular polygon suitable with ball is all greater than the surface area of ball, and reduces along with the increase of face number.In fact, it is infinite convex polyhedron that spheroid can be regarded a face number as, and it is littler than the specific area of any one convex polyhedron, thereby must be littler than the specific area of any regular polygon.

In positive convex body, the surface area maximum of positive tetrahedron.With quality 50g, density 7.8g/cm ³The surface area of sphere, cylinder (draw ratio is 1:1) and positive tetrahedron of spheroidal graphite cast-iron casting be respectively 16.68,19.10,24.87cm ², namely spherical: cylinder: positive tetrahedron=1:1.145:1.491.The seamed edge of positive tetrahedron is minimum simultaneously, is convenient to processing.

Since positive tetrahedron seamed edge and drift angle place easy to wear, therefore need align tetrahedral seamed edge and drift angle and carry out " arc " and handle, to realize its surface smoothing.

The shape characteristic of comprehensive sphere, cylindrical (forging), positive tetrahedron abrasive body, by cement grinding dynamics is furtherd investigate, inquire into grinding media shape to the influence of abrasive body characteristics of motion in ball mill, sum up with positive tetrahedron abrasive body replacement ball, forge abrasive body, when work, can bring following beneficial effect.

1) positive tetrahedron leaves the zone greatly because the surface does not have the arc surface structure, and less with the relative slip of ball mill barrel, hoisting depth is higher in the cylindrical shell operation process, and percussion is strong, and grinding effect is strengthened.The ball medium is because hoisting depth is little, and shock zone is narrow, during simple some contact impact, " splash can " loss greatly, and the fragment that flies out has 45% energy not to be utilized.And positive tetrahedron produces point, line, surface to material in the cylindrical shell running multiple contact impact effect, the variation of impact mode, " energy splashes " loss when impacting material is less, has improved the capacity usage ratio of grinding machine.

2) specific area of positive tetrahedron is bigger, and making has bigger frictional force between abrasive body and the material, and the shearing that produces is more, and is stronger to the abrasive action of material.

3) be that face, line, point contact between positive tetrahedron and positive tetrahedron, positive tetrahedron and material, positive tetrahedron and the liner plate, the result of these several contact comprehensive functions, cause the grinding shear stress of itself and storeroom always in transient change, this grinding to material is very favourable.

4) traditional sphere, cylindrical abrasive body easily disperse to break away from after motion process, and positive tetrahedron is unsmooth owing to shape, piles up, is embedded in together to produce " mechanical lock knot " effect, and material is locked between the positive tetrahedron, and grinding effect is good.

5) between traditional abrasive body owing to be the collision of point, line, the material particles that is sandwiched between point, the line splashes away easily, can not get effective grinding.And face face contact probability maximum between the positive tetrahedron, material particles need the slip certain distance, so material can be ground fully if want the contact of escape surfaces face.

6) because the loose volume weight of positive tetrahedron abrasive body is bigger, therefore under the identical weight condition, the center of gravity of rotating part is on the low side, and flywheel moment is also little, so power consumption is lower than ball medium, good energy-conserving effect.

Description of drawings

Fig. 1 is the structural representation of abrasive body of the present invention.

The specific embodiment

Grinding media shape provided by the invention is the positive tetrahedron structure as shown in Figure 1, and the seamed edge of described positive tetrahedron 1 and drift angle be all through the cambered surface transition processing, makes to be the cambered surface transition between plane and the plane and to be connected.

Use little mill that abrasive body and traditional ball, the forging shape abrasive body of the embodiment of the invention are compared test, conclusion shows that the bulk density of positive tetrahedron abrasive body is more spherical and it is big to forge shape, and porosity is less relatively, and grinding effect is good, can enhance productivity.Following table is the concrete various correction datas that adopt water feeding method to record.

Claims (1)

1. abrasive body is characterized in that the positive tetrahedron that is shaped as of described abrasive body, and the seamed edge of described positive tetrahedron and drift angle be all through the cambered surface transition processing, makes that the cambered surface transition is connected between plane and the plane.

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