CN205550427U - Half whole grinding of cement grinds and ball -milling combination system immediately - Google Patents

Abstract

The utility model discloses a vertical mill for cement semi-final grinding. On the basis of the existing vertical mill, the upper part of the vertical mill housing is respectively provided with a static vane 1, a stationary vane 2, a rotor and a feeding pipe from the outside to the inside. Blade 1 and stator blade 2 are respectively fixed on the inner shell from outside to inside, the lower parts of stator blade 1 and stator blade 2 are respectively connected to feeding cone 1 and feeding cone 2, and the cone part of feeding cone 1 is connected to the feeding port. The cone part of the second feeding cone is connected to the outlet of the semi-finished product. The feeding pipe passes through the second feeding cone and communicates with the first feeding cone to form a mixing chamber. The rotor includes a series of movable blades distributed radially around the feeding pipe. The space in the rotor communicates with the air outlet. The utility model also discloses a combined system comprising the vertical mill. The utility model can realize multiple separations in the vertical mill, improve the grinding efficiency of the vertical mill and the powder selection efficiency of the powder separator, and can control the fineness of semi-finished materials at the same time, which is beneficial to improving the quality of cement.

Description

Cement semi-final grinding vertical mill and ball mill combined system

technical field

The utility model belongs to the technical field of cement grinding, in particular to a cement semi-final grinding vertical mill and a combined system with a ball mill.

Background technique

At present, cement grinding mainly adopts different grinding systems consisting of ball mill or roller press + ball mill. Compared with ball mills, vertical mills have high grinding efficiency, low power consumption (20% to 30% power saving compared with ball mills), large drying capacity, large particle size of materials allowed to enter the mill, simple grinding process, and small footprint , low civil construction cost, low noise, low wear, long life, easy operation and other advantages, has been widely used in grinding cement raw materials and coal powder, but for the production of cement has not been widely promoted, the main reason is that Whether the final grinding of cement can really achieve energy-saving effect, and the second is that the use of vertical mills in the production of cement may change the characteristics of cement, such as product fineness, particle gradation, shape, etc., so that it cannot meet the requirements of national standards.

Patent ZL201010191141.8 discloses a semi-final pre-grinding vertical mill and ball mill combined grinding device, which combines the semi-finish vertical mill and ball mill together, and the material is firstly semi-finally ground by the semi-finish vertical mill system , and then the final grinding is carried out by the closed-circuit ball mill system with a classifier. This process can give full play to the advantages of vertical mill and ball mill, so that the shape of cement particles after grinding is better and the grinding efficiency is improved. However, the vertical mill in the system If a conventional internal circulation vertical mill powder separator is used, since a large amount of hot air needs to be introduced, the high-speed upward airflow blown out by the blowing device should not be too large, otherwise more coarse powder will be blown into the powder separator along with the fine powder, thereby increasing the High energy consumption. At the same time, if the coarse powder and fine powder cannot be effectively separated in the powder classifier, the particle size of the powder entering the ball mill is difficult to control, and some fine powders are over-milled in the ball mill.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the existing vertical mill as a semi-finish grinding, which has low efficiency and the fineness of the semi-finished materials produced is difficult to control, improve the separation efficiency of the powder classifier and the quality of cement, and provide a semi-finish vertical grinding machine. grind.

The technical scheme that the utility model adopts is:

A cement semi-final grinding vertical mill, comprising a reducer, an injection device, a grinding disc, a grinding disc liner, a grinding roller, a material inlet, and an air outlet. Stationary vane 1, stationary vane 2, rotor, and feeding pipe located on the same axis, the feeding port is located at the top of the feeding pipe, stationary vane 1 and stationary vane 2 are respectively fixed on the inner casing from outside to inside, stationary vane 1 and The lower part of the static vane 2 is respectively connected to the feeding cone 1 and the feeding cone 2. The space between the static blade 1, the feeding cone 1 and the shell is connected to the slag discharge port, and the cone part of the feeding cone 1 is connected to the feeding port. The cone part of the second feeding cone is connected to the outlet of the semi-finished product. The feeding pipe passes through the second feeding cone and communicates with the first feeding cone to form a mixing chamber. The rotor is arranged around the feeding pipe. The rotor includes a series of radially distributed Moving blades, the space in the rotor communicates with the air outlet.

Preferably, the angle of the stationary vanes can be adjusted; the cone angle of the feeding cone 1 is smaller than that of the feeding cone.

The utility model also discloses a combined vertical mill and ball mill system. The system includes the cement semi-finish grinding vertical mill and the ball mill described above. It is characterized in that the feed port of the cement semi-finish Batching system, the slag outlet is connected to the batching system through a belt machine, so that the coarse material discharged from the slag outlet is mixed with the ingredients and sent to the vertical mill; the semi-finished product outlet of the cement semi-finishing vertical mill is connected to the ball mill through a belt conveyor. The discharge port of the ball mill is connected to the powder classifier through the belt conveyor and the hoist. The finished fine material selected by the powder classifier is collected by the dust collector and sent to the finished product warehouse. The selected coarse material is mixed with the cement semi-final grinding vertical mill The coarse material discharged from the semi-finished product outlet is mixed and then sent to the ball mill; the air outlet of the cement semi-final grinding vertical mill receives the dust collector through the pipeline, and the fine material enters the finished product warehouse after being collected by the dust collector.

Beneficial effects: the semi-final grinding vertical mill of the utility model and the system including the vertical mill add a device for separating coarse and fine powder by using the stationary vane and the moving vane in the vertical mill, which improves the grinding efficiency and efficiency of the vertical mill. The powder selection efficiency of the powder separator can control the fineness of semi-finished materials at the same time, which is conducive to improving the quality of cement. The centrifugal force is generated by the moving blades in the vertical mill, and the two-stage stationary blades plus the moving blades are screened step by step to separate the powder and particles of different sizes, and the finished products are screened to prevent over-grinding. The semi-finished products are sent to the ball mill for further processing, and the coarse slag enters the batching system. The vertical mill and the combined system of the utility model can greatly improve the quality of cement products, improve the efficiency of grinding and ball milling, and the process is easy to control through the adjustment of the stationary blades.

Description of drawings

Fig. 1 is a schematic diagram of the vertical mill structure;

Fig. 2 is a sectional view of the II portion shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the utility model system.

In the figure, 1. Reducer; 2. Injection device; 3. Grinding disc; 4. Grinding disc lining; 5. Grinding roller; 9. Static vane 1; 10. Static vane 2; 11. Rotor; 12. Material inlet; 13. Air outlet; 14. Mixing cavity; Mouth; 18, moving blade.

The arrows in Figure 1 represent: x1, powder 1; x2, powder 2; x3, powder 3; c1, coarse material 1; c2, coarse material 2; c3, coarse material 3.

detailed description

In order to overcome several shortcomings of the prior art, improve the grinding efficiency of the vertical mill and the powder selection efficiency of the powder separator, and control the fineness of semi-finished materials at the same time, the utility model proposes a semi-final grinding vertical mill, which can realize Multiple sorting in the vertical mill is beneficial to improve the quality of cement.

The technical scheme adopted by the utility model is: on the basis of the existing cement vertical mill, a coarse and fine powder separation device is further added. The semi-finishing vertical mill structure mainly includes: grinding rollers, grinding discs, grinding disc liners, blowing devices, reducers, material inlets, air outlets, semi-finished product outlets, slag discharge ports, and feeding cones. Feed cone 2, feed pipe, stationary vane 1, stationary vane 2, rotor. As the powder selection and separation device of the semi-final grinding vertical mill of the utility model, concentric stationary vane 1, stationary vane 2, rotor, and feeding pipe are respectively arranged in the housing from outside to inside. One end of the stationary vane 1 and the stationary vane 2 are respectively fixed on the shell of the powder separator, and the other ends are respectively connected with the first feeding cone and the second feeding cone. The tapered portion of the first feeding cone is connected to the feeding port. The second feeding cone is located inside the first feeding cone, the cone is provided with a semi-finished discharge pipe, and the semi-finished discharge pipe is drawn out along the cone line of the second feeding cone to prevent powder accumulation, and the second feeding cone The included angle of the cone portion of the feed cone is greater than that of the feed cone one, and is connected to the discharge port. The feeding pipe communicates with the feeding cone 1 after passing through the feeding cone 2.

The high-speed upward hot air flow from the nozzle device of the vertical mill performs the first separation on the materials crushed by the grinding rollers. The slag is discharged.

After the first sorting, the mixture of powder and air changes from vertical rise to tangential flow after entering the powder classifier. In the range between the first stator blade, the second stator blade and the rotor blade, the flow formed by the rotation of the rotor The centrifugal force separates the mixture of powder and air several times. The large-grained material passing through the static vane 1 is thrown out and sinks under the action of gravity. After leaving the range of centrifugal force, it falls into the feeding cone 1 and enters the vertical mill through the feeding port; after the fine powder passes through the stationary vane 2, Enter the space between the stationary vane and the rotor to be sorted again, the sorted coarse powder is discharged through the semi-finished product outlet of the second feeding cone, and the qualified finished product is discharged from the air outlet on the upper part of the powder separator.

Under the action of the centrifugal force formed by the rotation of the rotor, the powder and air mixture are separated for the second, third and fourth times through the stator blade 1, the stator blade 2 and the rotor successively. The large particle material after sorting by the static blade 1 falls into the vertical mill, and another part of the material enters the static blade 2 for the third separation; the coarse material after the third separation enters through the discharge port of the discharge cone 1 In the vertical mill, another part of the material enters the rotor for the fourth sorting; the semi-finished material after the fourth sorting is discharged through the semi-finished product outlet of the feeding cone 2, and the qualified finished product is discharged from the air outlet on the upper part of the powder separator.

Referring to accompanying drawing 1, the semi-final grinding vertical mill of the present utility model mainly comprises: grinding roller 5, grinding disc 3, grinding disc liner 4, blowing device 2, reducer 1, material inlet 12, air outlet 13, semi-finished product outlet Material port 16, slag discharge port 17, feeding cone 1 6, feeding cone 2 7, feeding pipe 8, stationary vane 1 9, stationary vane 2 10, rotor 11, and rotor 11 includes a series of radially arranged moving vanes 18.

When the vertical mill is working, the motor drives the millstone 3 to rotate through the reducer 1, and the material falls to the center of the millstone liner 4 through the feeding port 12 through the feeding pipe 8, and the material moves to the edge of the millstone 3 under the action of centrifugal force and is ground. Roller 5 crushes, the pulverized material overflows from the edge of the grinding disc 3, is taken up and dried by the high-speed upward hot air flow from the nozzle device 2, and performs the first sorting, and the sorted powder x1 is brought to the In the powder selection and separation device on the upper part of the vertical mill, the coarse material c1 is discharged from the slag outlet 17 at the lower end, and fed into the mill again through the bucket elevator through the external circulation from the feeding port for grinding again.

The mixture of powder and air after the first sorting changes from vertical rise to tangential flow after entering the powder classifier. In the range between the first vane 9, the second vane 10 and the rotor 11, the centrifugal force formed by the rotation of the rotor 11 moves the mixture of powder x1 and air in the passage formed by the first vane 9 and the second vane 10 Secondary sorting; the coarse material c2 from the second sorting falls into the mixing cavity 14 formed by the first feeding cone 6, the second feeding cone 7 and the feeding pipe 8, and then returns to the grinding table through the feeding port 15 On the liner 4, grind again. The powder x2 after the second sorting is brought by the airflow to the channel formed by the second vane 10 and the rotor 11 for the third sorting; the coarse material c3 that is sorted out for the third time is exported from the semi-finished product of the feeding cone 7 16, and the fine powder x3 from the third sorting is discharged from the air outlet 13 on the upper end of the powder classifier with the air flow upward, and collected in the dust collection device of the system, it is a qualified product.

Referring to accompanying drawing 2 again, the structure of stator blade and rotor is shown. The rotor 11 includes a series of moving blades 18 arranged radially around the feeding tube 8 , and the space inside the rotor is connected to the air outlet 13 . The rotation of the rotor generates centrifugal force, and the angles of the first stationary vane 9 and the second stationary vane 10 can be adjusted, so that the separated granularity can be adjusted and the quality of cement can be improved.

Accompanying drawing 3 has shown the system that comprises the semi-finish grinding vertical mill of the utility model. As shown in the figure, the batching system sends the raw materials to the feed inlet of the vertical mill through the elevator. After the raw materials are ground and separated in the vertical mill, coarse material c1, coarse material c2, coarse material c3 and powder x3 are produced. Coarse material c1 is obtained from The slag discharge port of the vertical mill is discharged, and then sent to the batching system through the belt conveyor for mixing, and then sent to the material inlet of the vertical mill. Coarse material c2 enters the mixing chamber along the feeding cone, and then enters the vertical mill together with the ingredients coming down from the feeding port. The coarse material c3 separated from the rotor and the stationary blade 2 is discharged from the semi-finished product outlet along the feeding cone 2, and sent to the ball mill through a belt conveyor. The powder x3 produced after rotor separation is sent to the dust collector through the air outlet of the vertical mill and then sent to the finished product warehouse. The output of the ball mill is sent to the powder separator through the belt conveyor and the hoist. The finished fine material selected by the powder separator is collected by the dust collector and then sent to the finished product warehouse. The coarse material c3 discharged from the semi-finished product outlet is mixed and then sent to the ball mill.

By means of the combined vertical mill and ball mill system of the utility model, the materials are fully separated, the particle size is easily controlled, and the occurrence of over-grinding is prevented. Different materials with appropriate particle size are treated differently, and product quality and production efficiency are improved.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Various changes are made.

Claims (4)

1. A cement semi-final grinding vertical mill, comprising a reducer, an injection device, a grinding disc, a grinding disc liner, a grinding roller, a material inlet, and an air outlet. There are stationary vane 1, stationary vane 2, rotor, and feeding pipe located on the same axis. The feeding port is located at the top of the feeding pipe. Static vane 1 and stationary vane 2 are respectively fixed on the inner shell from outside to inside. The lower parts of the first and the stationary vane two are respectively connected to the first and second feeding cones, the space between the first stationary vane and the first feeding cone and the shell is connected to the slag discharge port, and the cone part of the first feeding cone is connected to the feeding The cone part of the feeding cone 2 is connected to the outlet of the semi-finished product. The feeding pipe passes through the feeding cone 2 and communicates with the feeding cone 1 to form a mixing chamber. The rotor is arranged around the feeding pipe. The rotor includes a series of radial Distributed moving blades, the space in the rotor communicates with the air outlet. 2. The cement semi-final grinding vertical mill as claimed in claim 1, wherein the angle of the stationary vane is adjustable. 3. The vertical mill for cement semi-final grinding as claimed in claim 1, wherein the cone angle of the blanking cone one is smaller than the cone angle of the blanking cone two. 4. A combined system of vertical mill and ball mill, said system comprising the cement semi-finish grinding vertical mill and ball mill as described in any one of the preceding claims, characterized in that the input of said cement semi-finish grinding vertical mill The material port is connected to the batching system, and the slag discharge port is connected to the batching system through a belt conveyor, so that the coarse material discharged from the slag discharge port is mixed with the batching material and then sent to the vertical mill; the semi-finished product discharge port of the cement semi-final grinding vertical mill is connected to the conveyor equipment The material inlet of the ball mill and the material outlet of the ball mill are connected to the powder classifier through the conveying equipment and the hoist. The finished fine material selected by the powder classifier is collected by the dust collector and sent to the finished product warehouse. The selected coarse material is mixed with the cement semi-final powder. The coarse material discharged from the semi-finished product outlet of the vertical mill is mixed and then sent to the ball mill; the air outlet of the vertical mill for semi-finish cement grinding passes through the pipeline to receive the dust collector, and the fine material is collected by the dust collector and then enters the finished product warehouse.