Cement mill principle and application

This mill is the center drive, center discharge three positions mill. 1250kW of the main motor 1 by the rubber block coupling,gold milling machine ZL314 reducer, the middle drive shaft, hollow shaft driver of rigid couplings and mill outlet mill cylinder 8 17.7r/min speed rotation. Cylinder at both ends of the hollow shaft supported on the main bearing 7 and 9. In the cylinder body, enhance the double diaphragm plate installed between the two positions, two, three positions between the installation of the single-layer diaphragm plate. One, two positions with bolts solid mounted ladder liner inlay puzzle within three positions of small corrugated liner.

Material from the feed device 10 feed mill after three chambers grinding elliptical holes on the drive to take over unloading into and out of the feeding device, through the sieve analysis finished by the transportation equipment shipped to the material library, coarse and broken grinding media and other debris from the discharge screen the flanking export unloaded.

Set the mill grinding within the sprinkler spray of cooling water through the mill device 11, the spray pipe 18 is injected into the mill, in order to reduce the grinding temperature, to prevent dehydration of gypsum false condensate,coal pulverizer manufacturer sticky ball to plug compartment plate grate holes and discharge grate holes, to achieve the purpose of cement product quality.

The main bearings of the mill in addition to has a lubrication system, and also set up a dedicated water cooling device to reduce the main bearing temperature to ensure the normal operation.

The mill also set the auxiliary gear, auxiliary drive, the speed of the mill body 0.2r/min slow rotation.

In order to make the parts and free access to the cylinder, and ease of maintenance and to ensure the cylinder strength, and called the man hole size should be appropriate. If too large a tube cross sectional area has weakened too much,concrete recycling equipment so that the cylinder increased stress. Manhole size, the long axis of 500 ~~ 800mm, the short axis of 300 ~ 400mm, the shape of the manhole with a large rounded corners rectangle or ellipse, and parallel to the cylinder longitudinal axis, so that the cylinder cross sectional area of ??weakened less .

Manhole at reinforcing measures: a riveting cast steel frame structure with flange attached to the manhole on the rivet pitch manhole distant, less impact stress concentration. The mill door cover type. Another is in the hole reinforcing layer of steel, and then with open manholes, and application of inner-lift manhole covers. The manhole cover itself is a special liner with hanging hole, manhole around a few pieces of the lining is often non-standard structure, so that the liner types 2 or 3 kinds, which is not conducive to the manufacture and spare parts reserves economy, but also because of its working surface is different from the other standard liner, which will affect the consistency of the grinding motion.

The manhole is preferable to the opening of the cold method. Using hot-melt cutting,glass crusher machine the machining allowance must be set aside under the plate thickness, the allowance should be increased with the increase of plate thickness, generally set aside an allowance of 10 ~ 25mm, the final machining process is a precision milling or fine grinding wheel is. Otherwise, the process of using irreparable cracks along the manhole.

The mill door (also known as the manhole cover) is a closed hole, convenient loading and unloading, and fixed firmly.

Cement mill,mill,manhole

The structure of the rod mill

The rod mill is the center drive center discharge, both ends of the mill by the main bearings supporting four Warehouse. Diaphragm plate mill built the cylinder separated for four positions,quartz grinding machine first positions filled with grinding media steel bars, so called rod mill

1 - feeding device; 2 - cone; - main bearings; - imported hollow shaft; - grinding end caps; 6 - Cover the liner; - grinding cylinder; 8 - a position lining; 9 - a warehouse compartment plate; 10 - two positions liner; 11 - two positions compartment board; 12 - three positions liner; 13 - three positions diaphragm plate; 14 - to block the ball circle; 15 - four positions liner ; 16 - backgauge circles; 17 - export grate; 18 - spiral sleeve; 19 - Export hollow shaft; 20 - discharging device; 21 - discharge casing; 22 - reducer; 23 - motor; 24 - lubrication devices; 25 - auxiliary motor; 26 - lubricating device baseball grinding wet raw mill.

When the rotary steel bars with mill upgrade and whereabouts, the brunt of the stick between the larger particle size materials, and fine-grained material is less susceptible to shock. Therefore, the materials from warehouse uniform particle size, to improve the grinding conditions of the second compartment. Baseball mill closed, open system, but the steel bars has the effect of the closed system of classification. Steel bars for better adaptability to the raw materials of high hardness, particle size of material into the mill may be appropriate to relax, but to replace the steel bar as the ball convenience.

The mill grinding body is the main motor power 800kW of 23, to 19.2r/min speed reducer 22,sand crushing plant the discharge casing 21 and export hollow shaft 19 driven rotation. Grinding cylinder body equipped with every other board positions 9, 11 and 13, the cylinder is divided into four chambers. Transition position double-diaphragm plate between the two positions, two, three positions three, four positions are based on

Cylinder of a warehouse built by the production of high-manganese steel corrugated liner is installed within the two positions are ladder liner 10, three or four positions within the inlay puzzle produced by alloy white cast iron corrugated liner (corrugated liner) 12 and 15. Shop between the cylinder and liner layer 3mm thick plywood, and some to pad a thin rubber sheet, and the other in order to prevent materials or broken grinding media to enter the the scour cylinder between the cylinder and liner, three, four positions small ripple between the liner and cylinder filling of asbestos cement.

Four warehouses built in order to improve mill grinding efficiency, high-manganese steel system block off circle 14 and the backgauge circle 16, with bolts in the cylinder. Material at the exit of four positions with export grate 17, it is from the inside, the outer export grate composition, through the grate plate frame bolts on the end cap of the mill exports.

The end cap of the mill is welded end caps and welded into one,silica sand processing plant and the cylinder end cap inner wall of the bolt end cap liner to protect the end caps are not worn. Filling the interstitial space between the cover and liner with cement mortar.

Mill into export hollow shaft connected together with bolts and mill end caps. Imports of hollow shaft 4 built-in cone. Export hollow shaft 19 contains a spiral sleeve 18, the main protective hollow shaft without material wear, while also facilitating the flow of materials. At the gap between the bushing and hollow shaft filling with cement mortar. Cylinder at both ends of the hollow shaft mounted on two sets of main bearings 3. The main bearings with lubrication device 26, for circulating lubrication.

Feed mill material from the feed device, and by the import hollow shaft into the grinding cylinder body, by the impact of various positions in the grinding media and grinding through the discharge grate 17, through the export of the hollow shaft 19,roll crusher manufacturer the discharge casing (also known as Drive over) 21 to the discharging device 20 within the cylindrical sieve, sieve analysis, the qualified products by the conveyor into the material library.

rod mill,ball mill,mill

Why is the ball by a certain percentage into the mill?

On the size of the ball depends on the physical and mechanical properties of ore and ore particle size composition.

Processing ore hardness and coarse granularity, belt conveyor in India and the need to have a greater impact, need to load large size ball; processing ore is relatively soft ore particle size smaller, the requirements of the product particle size smaller, should be to grind the main , vibrating feeder in India can be put into the smaller ball.

The production site mill load a variety of ball diameter of the ball to deal with the different sizes of mineral particles composed of materials by a certain percentage ratio. In theory, only a variety of balls of a certain percentage in order to particle size and grinding materials to adapt, in order to achieve good grinding effect.

The ratio of the ball is a more complex technical issues. Therefore, vibrating screen in India the production plant must be based on the actual situation, after a long investigation in order to arrive at a reasonable ratio of ball.

ball mill is too small will be what happens?

When dealing with particle size larger or greater hardness, the proportion of large ball less grinding minerals Coarse phenomenon reach the fineness requirements. Handling capacity is also limited, affect the grinding efficiency.

When dealing with the smaller size of ore and ore hardness lower material, if the ratio of the ball, the less will the phenomenon of the product the intensity of coarse. The ball should be an appropriate additional increase in the proportion of small ball, to adapt to the nature of the ore in order to get a better product fineness. Therefore, the system of the ball must be strictly in proportion to load, to prevent imbalance.

Additional ball is a more complex problem, since the law does not wear and tear on the ball a good grasp. Each processing plant must be based on actual conditions, after a long-term observation and research, and explore additional ball experience.

After the ball at once into a ball mill, why additional ball it? The ball mill continuous operation and impact of ore and grinding stripping, resulting in the ball constantly wear, destruction of the original ball ratio and the amount of ball. In order to keep the ball mount and the ratio of stable, must be regularly supplemented with a certain number of ball. The additional production is often only 1-2 big ball, small ball by ball wear off the bench. The additional number of general consumption quota to determine based on the ball. The rod mill and ball mill is the same as regular additional steel bars.

Grading operations in the grinding cycle?

Extension operations have a very important role in the grinding cycle. Should fine-grained disseminated useful minerals and gangue dissociation and sorting, the ore must be ground to a certain degree of fineness. But also to avoid crushing, to prevent the adverse effects of the mud on the separation process, which will need to wear part of the timely separation of mineral matter particle size qualified, to avoid unnecessary ground as soon as possible sent to the sorting operations, which will The granularity of failure, regardless of return to the mill regrinding.

Thus, the closed-circuit grinding cycle with grading operations, both in technical and economic significance are very significant. Grading operations in the concentrator production is widely used.

Why is the row of ore concentration is too large or too small?

When the row of ore concentration greater than the specified concentration requirements, zirconium silicate mining equipment price we must first find what is causing.

First check to see whether there is change in amount of ore to the mine records, silica sand filter if the increase, if no other reason, the amount of ore to adjust down. Any change or check the water pressure, such as depression (realized to reduce the water flow) caused by the concentration is too large, impact crusher in India it should be a corresponding reduction in the amount of ore in order to adapt to change. If you increase the water can be effective, you can also adjust the amount of water to adjust the concentration. If the concentration is less than the requirements, the adjustment method and the concentration of too much the opposite. To note that the adjustment process, we must pay attention to the other operating conditions with or without change, to prevent trade-off.

mill operation suddenly tube sound becomes shrill what is the reason?

When the mill in operation, the cylinder internal voice becomes shrill, if the duration longer to stop and check liner break damage break damage phenomena; check to the amount of ore is inadequate, generally found that this phenomenon is mainly These two kinds of reasons. Of course, sometimes, minor repairs, pay no attention to the wrench, or other iron lost in the cylinder body to cause abnormal sound.

If the cylinder internal intermittent dull sound of impact, it may be a piece of liner off; if the ball mill is a sudden discharge of small steel balls and ore block, said internal grid plate damaged.

when the current intermittent operation of the mill increased what is the reason?

From the production practice, if the current ammeter instructions on the operation panel, intermittent cyclical rise, the common reason is: when the mill ministries in normal operation, you need to find mud spoon head, then the mud spoon head is may be loose, loosening of the spoon head is caused by the current cyclical intermittent elevated. Of course, should also check the bottom of the mud spoon the ball or other iron to impede the rotation of the mud spoon.

If the current continues to rise, not to return to the rated current, it may be caused by the mill load is too large or low voltage. Belong to mine large cause to be adjusted to the amount of ore, mechanical problems caused by the load is too large, you should stop treatment. The low voltage caused by purely external power reasons, the positive ground observation with or without changes and motor temperature.

when the feed size increases or ore hardness larger grinding process?

The sudden appearance of this phenomenon, often due to the broken system screening equipment failure or sieve the end of a leaky, resulting in particle size increases. Changes in ore hardness, may be due to the mining face, with the mine caused. Appear in both cases, the grinding process will cause a corresponding change. First row of ore particle size coarsening, the second is to return the amount of sand increases.

The adjustment is to increase the row of ore concentration, increasing the concentration of the classifier overflow to make back the amount of sand down. If the fineness can not be resolved, may be appropriate to reduce the amount of ore to process.

ore,mill,grinding