CN1314212A

CN1314212A - Powder milling process and its equipment

Info

Publication number: CN1314212A
Application number: CN 01115649
Authority: CN
Inventors: 杨和平
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-29
Filing date: 2001-04-29
Publication date: 2001-09-26

Abstract

The present invention discloses one powder milling process and equipment with serially connected large ball mill and small ball mill. The powder milling process includes the step of crude milling, selection, separating material and fine milling to obtain finished product; and the material separating step is one to separate crude material for returning to crude milling and fine material for fine milling. The large and small ball mills are driven separately, one lifter is used to feed the discharge of large all mill to material selector and feed the fine material into finished product ware house, and the outlets of the material separator are connected to inlets of large and small ball mills separately. The present invention can raise the specific surface area of finished product and save powder and is suitable for milling various material.

Description

A kind of powder milling process and equipment thereof

The invention belongs to building materials industry grinding process and apparatus field, relate in particular to grinding process and equipment thereof that a kind of large-size ball mill is connected with small grinder and used.

The present large-size ball mill that uses, most closed circuit productions, install powder concentrator additional, the fine powder finished product packing is put in storage after selecting powder, meal is back to large-size ball mill, because the granularity difference of material is too big in the large-size ball mill, causes grinding unreasonable, its result causes that mill efficiency is low, equipment energy consumption is high, output can't improve.About more than 10000 of bead grinding machine below the existing φ 2.2M of whole nation building material industry, because energy consumption height and product quality, a large amount of small grinders will be forced to eliminate.

Chinese patent ZL99210033.X discloses a kind of split crossfire ball mill, be that two table grinders are utilized a cover actuator drives, this form, bigger to two grinding machines in upper specification limit system, otherwise mill feed material quantity and grinding fineness are difficult to regulate, cause energy waste, also be difficult to reach simultaneously the grinding process technical parameter.

The invention provides a kind of this kind equipment that can make and come back to life, improve mill efficiency, both can save energy, guarantee the new milling equipment and the production method thereof of product quality grade again.

To achieve these goals, the invention provides a kind of powder milling process, form by following steps:

(1) corase grind; (2) sorting; (3) sub-material; (4) fine grinding; (5) finished product, wherein sub-material is that the coarse fodder after the sorting is sent respectively, and a part is back to corase grind, and another part is sent to fine grinding.

Above-mentioned powder milling process, its characteristics are: the mill feed size of described corase grind material requires less than 25mm, and described sorting is that the thickness powder is separated by granule size, and described sub-material is that the coarse fodder after the sorting is delivered to corase grind and fine grinding respectively.

Above-mentioned powder milling process, its characteristics are: the granularity of described sorting material is a coarse fodder greater than 32 μ m, the fine powder that is less than or equal to 32 μ m is a finished product.

In order better to realize above-mentioned purpose, the present invention also provides a kind of milling equipment of realizing above-mentioned process, by large-size ball mill, lifting device, powder concentrator, tripper, small grinder, power source and transmission device are formed, described large-size ball mill and small grinder are respectively by actuator drives independently separately, described large-size ball mill is connected by lifting device with powder concentrator, described powder concentrator is equipped with two discharging openings of thickness, the fines mouth is connected with warehouse for finished product, the charging aperture of coarse fodder mouth and tripper connects, described tripper is placed in the lower end of described powder concentrator, and described tripper is connected with the small grinder feeding mouth with large-size ball mill respectively.

Above-mentioned milling equipment, its characteristics are: described tripper is made up of feeding mouth, tripper main body, motor, flashboard, discharging opening, described tripper main body is the inner tubular shell that impeller is housed, described impeller joins by belt pulley and electric machine main shaft, described tripper bottom is equipped with two discharging openings, and both sides are separately installed with the flashboard of control discharging.

Above-mentioned milling equipment, its characteristics are: in the described small grinder partition panel is installed, small grinder is divided into former and later two grinding storehouses, preceding storehouse is placed with forging, and back storehouse is placed with micro medium.

Above-mentioned milling equipment, its characteristics are: described forging is cylindric, and its diameter is 10-15mm, and length is 10-25mm, and described micro medium granularity is 3-8mm.

Large-size ball mill and powder concentrator form the I level and close stream production, small grinder forms the II level and opens stream production, the use of connecting with small grinder of large-size ball mill, powder concentrator, organically connect with the peripheral hardware tripper, technique scheme is that a kind of can making in a large number come back to life discarded small grinder, reach energy-saving and cost-reducing, improve mill efficiency, guarantee the new powder milling process and the equipment thereof of product quality grade effect.

Below in conjunction with accompanying drawing embodiments of the invention are described further.

Fig. 1 is a grinding technological process of production schematic diagram of the present invention

Fig. 2 is a tripper structural representation of the present invention

Fig. 3 is a small grinder partition panel installation site generalized section

Fig. 4 is the partition panel structural representation

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4: large-size ball mill 1, small grinder 2, partition panel 2 ＇, powder concentrator 3, tripper 4, large-size ball mill feeding mouth 5, large-size ball mill discharging opening 6, small grinder feeding mouth 7, small grinder discharging opening 8, it is 10 that warehouse for finished product 9, the travelling gear of large-size ball mill are paid, reductor 11, motor 12, the travelling gear of small grinder pays 13, reductor 14, motor 15, tripper feeding mouth 16, tripper main body 17, motor 18, right flashboard 19, the right discharging opening 20 of tripper, left flashboard 22, tripper left side discharging opening 21;

Large-size ball mill 1 is connected with powder concentrator 3, tripper 4 closed loops by the elevator that has hopper, tripper 4 is installed in powder concentrator 3 bottoms, tripper feeding mouth 16 joins with the powder concentrator exit is corresponding, tripper discharging opening 20 joins by pipeline and small grinder feeding mouth 17, to large-size ball mill feeding mouth 5, the right discharging opening 20 of the right flashboard 19 control trippers of tripper, tripper left side flashboard 22 are controlled tripper left side discharging openings 21 to tripper discharging opening 21 by pipeline.

Comminuting matter enters large-size ball mill 1 by large-size ball mill feeding mouth 5, and steel ball and forging are housed in the large-size ball mill 1, the powder behind grinding, by the 16 places discharging of large-size ball mill discharging opening, enter powder concentrator 3 through elevator, through selecting the powder classification, qualified fine powder is gone into warehouse for finished product 9 through pipeline; Meal enters tripper feeding mouth 16, through drive the rotation of tripper main body 17 impellers by motor 18 drive pulleys, powder is evenly distributed, a part is returned large-size ball mill feeding mouth 5 places by tripper discharging opening 21, a part enters small grinder feeding mouth 7 by tripper discharging opening 20, correspondence is equipped with right flashboard 19, left flashboard 22 respectively at the right discharging opening 20 of tripper, left discharging opening 21 places, is used for the free adjustment of load size; As required, go into to the meal of tripper 4, can all enter small grinder 2, also can partly enter small grinder 2 from powder concentrator 3; Small grinder 2 middle parts are equipped with partition panel 2 ＇, partition panel 2 ＇ are that garden shape is tabular, have the fan-shaped of sieve aperture by several and combine with sieve aperture garden, center, will grind the storehouse with partition panel 2 ＇ and be divided into the storehouse, front and back, forging is equipped with in preceding storehouse, the forging specification is that diameter 10mm, length are 15mm, and the micro medium that specification is 6mm is equipped with in back storehouse, through preceding storehouse grinding, enter back storehouse fine grinding again, after reaching the requirement fineness,, send into warehouse for finished product 9 by the 8 places discharging of small grinder discharging opening.

Utilize the concrete process of above-mentioned milling equipment as follows:

Granularity is dropped into the large-size ball mill grinding less than the material of 25mm, draw off the back from afterbody and will grind good powder by the elevator that has hopper and send into powder concentrator, the sorting of process powder concentrator, satisfactory fine powder is a finished product, directly packs warehouse-in with discharging opening; Fineness falls into tripper greater than the coarse fodder of 32 μ m, and impeller is installed in the tripper, and by the rotation of Motor Drive belt pulley impeller, impeller plays the effect of lock material in feed bin; The tripper bottom is provided with two discharging openings, both sides are equipped with the flashboard that can control discharging separately respectively, size in order to the control load, coarse fodder part in the tripper is returned large-size ball mill feeding mouth place by discharging opening by pipeline, another part enters small grinder feeding mouth place by another discharging opening by pipeline, coarse fodder also can enter small grinder fully, continues grinding and meets the requirements of fineness, is finished product.

In large-size ball mill, steel ball and forging need be housed according to the function in each grinding storehouse; And small grinder only need be adorned forging, because levigate requirement, also to add micro medium, the small grinder middle part is equipped with partition panel, and partition panel is a circular slab, has the fan-shaped of sieve aperture by several and combines with sieve aperture garden, center, two storehouses before and after partition panel is divided into the grinding storehouse, forging is equipped with in preceding storehouse, and the forging diameter is 10-15mm, and length is 10-25mm; Micro medium or little forging are housed in the back storehouse, and granularity is at 3-8mm, can be with improved grinding very thin, cement specific surface area can reach 400-500m ²/ kg, product fineness is adjusted by I level closed circuit powder concentrator and II level small grinder grinding, can obtain optimal parameter.

The present invention has following effect in production practices:

1, mill output improves 25%;

2, reduce 10-16% than the simple large-size ball mill power consumption that uses;

3, be conducive to that ball is forged and the optimum gradation of grinding material, easily adjust the grain grade proportion of finished product, product fineness easy to control has Be beneficial to and implement cement new-standard (standard in line with international standards);

4, can adapt to preferably the grinding requirement of hardness and the granularity of different material.

Claims

1, a kind of powder milling process is characterized in that: be made up of following steps:

2, powder milling process according to claim 1 is characterized in that: the material mill feed size of described corase grind requires less than 25mm, and described sorting is that the thickness powder is separated by granule size, and described sub-material is that the coarse fodder after the sorting is delivered to corase grind and fine grinding respectively.

3, powder milling process according to claim 2 is characterized in that: the granularity of described sorting material is a coarse fodder greater than 32 μ m, and the fine powder that is less than or equal to 32 μ m is a finished product.

4, a kind of milling equipment that adopts the described process of claim 1, by large-size ball mill, lifting device, powder concentrator, small grinder, power source and transmission device are formed, it is characterized in that: described large-size ball mill and small grinder are respectively by actuator drives independently separately, described large-size ball mill is connected by lifting device with powder concentrator, described powder concentrator is equipped with two discharging openings of thickness, the fines mouth is connected with warehouse for finished product, the charging aperture of coarse fodder mouth and tripper connects, described tripper is placed in the lower end of described powder concentrator, and described tripper is connected with the small grinder feeding mouth with large-size ball mill respectively.

5, milling equipment according to claim 4, it is characterized in that: described tripper is made up of feeding mouth, tripper main body, motor, flashboard, discharging opening, described tripper main body is the inner tubular shell that impeller is housed, described impeller joins by belt pulley and electric machine main shaft, described tripper bottom is equipped with two discharging openings, and both sides are separately installed with the flashboard of control discharging.

6, milling equipment according to claim 4 is characterized in that: in the described small grinder partition panel is installed, small grinder is divided into former and later two grinding storehouses, preceding storehouse is placed with forging, and back storehouse is placed with micro medium.

7, milling equipment according to claim 6 is characterized in that: described forging is cylindric, and its diameter is 10-15mm, and length is 10-25mm, and described micro medium granularity is 3-8mm.