CN101433897A - High-effective flour screening machine with wide size distribution of particles - Google Patents

Abstract

The invention provides a high-efficiency powder separator with wide particle size distribution. It includes a shell, a cage rotor, a spreading plate, a central air duct and a coarse powder cone; the central air duct is installed on the upper part of the shell, and the spreading plate and rotor are arranged below it, and the air inlet and Feed inlet; a coarse powder cone is set under the rotor; the semi-annular collecting hopper of the secondary separation device is set on the upper part of the coarse powder cone, and the lower port of the collecting hopper communicates with the upper port of the four-way joint through the air lock valve The two sides of the four-way joint are respectively connected to the separator and the secondary air, and the lower port is connected to the air lock valve; the upper port of the separator is connected to the air outlet pipe, and the lower port of the separator is connected to the overflow through the air lock valve. The flow warehouses are connected. The invention can sort out the fine powder, finer powder and coarser powder required by the cement with wide particle size distribution at one time, improves the particle distribution of the selected powder, reduces the water demand of cement, and improves the relationship between cement and external cement. The compatibility of the agent, as well as the working performance of the cement, and can reduce energy consumption and production costs.

Description

Efficient classifier with wide particle size distribution

technical field

The invention relates to a powder selecting device, in particular to a high-efficiency powder selecting machine with wide particle size distribution suitable for cement circular flow grinding.

Background technique

At present, ball mills are generally used for cement grinding, which can be divided into open flow type and circular flow type according to the production process. The open-flow mill is to mix the clinker and the admixture in proportion, and then grind them together. The powder after grinding can be directly used in cement production without powder selection; however, the open-flow mill has high energy consumption and low output. The production cost is high and has been phased out. The circular flow mill is widely used in the grinding system because of its low energy consumption, high system output, which is conducive to large-scale and improvement of labor productivity per capita; however, the powder after the circular flow mill needs to be selected by a powder separator deal with. In recent years, with the development of high-efficiency powder separator technology, the separation accuracy of powder separator is getting higher and higher, the particle distribution of cement is getting narrower, the proportion of mixed materials is low, and the water demand of cement is too large. The compatibility of cement is poor, and the working performance of cement decreases. In order to change the particle size distribution of cement and improve the working performance of cement, some factories are forced to change the circular flow grinding system into an open flow grinding system, but the open flow grinding is different from the circular flow grinding in terms of energy consumption and large-scale Incomparable; there are also some manufacturers that first grind part of the mixed material separately to produce some powders with a coarser particle size, and then add these coarser mixed material powders to the cement produced by the circular flow powder , so as to change the particle distribution of cement, although it is very effective in changing the particle distribution of cement, it also makes the cement grinding system very complicated and greatly increases the investment.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-efficiency classifier with wide particle size distribution suitable for the cement circular flow grinding process, which can effectively change the shortcomings of the previous high-efficiency classifiers with narrow particle distribution. Produce cement with wide particle size distribution, reduce the water demand of cement, and improve the compatibility of cement and admixtures.

The technical solution of the present invention to solve the technical problem is: comprising a housing, a cage rotor, a spreading pan, a central air duct and a coarse powder cone; The rotor has an air inlet and a feed inlet on the shell; a coarse powder cone is arranged under the rotor; a secondary separation device including a collecting hopper, a four-way joint, a separator and an overflow bin, and a semi-annular collection The hopper is set on the upper part of the coarse powder cone, the lower port of the collecting hopper is connected with the upper port of the four-way joint through the air lock valve, the two side ports of the four-way joint are respectively connected with the separator and the secondary air, and the lower port is connected There is an air lock valve; the upper port of the separator is connected with an air outlet pipe, and the lower port of the separator is connected with the overflow bin through the air lock valve.

The bottom of the above-mentioned overflow bin is in an inverted V shape, and the lower part of the overflow bin is set as a discharge bin and a return bin. The lower port of the outlet bin is provided with a discharge valve, and the outlet bin is opposite to the lower port of the separator. , so that the sorted coarser powder falls into the discharge bin first, and automatically overflows into the return bin after the discharge bin is full.

There is a measuring scale behind the discharge valve at the lower end of the discharge bin to measure the weight of the coarser powder mixed into the cement and to change the particle distribution of the cement conveniently.

The upper opening area of the above-mentioned collecting hopper is one-fifth to one-eighth of the upper opening area of the coarse powder cone, and only part of the coarse powder is intercepted for secondary sorting, and the finer powder and coarser powder are enough for use The mixing ratio of cement can be used to reduce the working pressure of secondary sorting.

There is an adjustable butterfly valve in the air outlet pipe at the top of the separator to easily adjust the air volume of the secondary air intake and control the particle size of the powder entering the separator; due to the different density of the mixture material and cement clinker, the density is lighter The mixed material is more likely to enter the separator and be collected than the denser cement clinker, so as to increase the proportion of coarser powder in the mixed material.

When working, the powder of clinker and mixed material after grinding by the mill falls into the high-speed rotating spreading plate through the feeding port, and is thrown to the powder selection area. Under the action of the high-speed rotating rotor, the fine powder enters the center The air duct is drawn out and enters the subsequent dust collector to be collected. Most of the coarse powder falls directly into the coarse powder cone, and a small part enters the ring collecting hopper. The coarse powder entering the ring-shaped collecting hopper, the coarse powder will fall into the coarse powder cone directly through the air lock valve under the four-way joint, and the rest of the powder will enter the separator under the action of the secondary air. The powder enters the follow-up dust collector from the air outlet pipe at the top of the separator to be collected; while the coarser powder falls into the discharge bin of the overflow bin below the separator, and is discharged from the discharge valve at the bottom of the discharge bin. It is discharged and mixed into cement after metering; when the coarse powder in the discharge bin is full, it will automatically flow into the return bin, and return to the mill for re-grinding together with the coarse powder in the coarse powder cone. By mixing the sorted fine powder, finer powder and coarser powder in proportion, cement with wide particle size distribution can be obtained.

The beneficial effects of the present invention are: the structure is reasonable, the particle distribution of the selected powder can be effectively improved, the cement with wide particle size distribution can be produced conveniently, the water demand of the cement can be reduced, and the compatibility between the cement and the admixture can be improved. , and the working performance of cement, and can reduce energy consumption and production costs.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: 1 is the unloading valve, 2 is the coarse powder cone, 3 is the shell, 4 is the air inlet, 5 is the cage rotor, 6 is the spreading plate, 7 is the feeding port, 8 is the central air duct, 9 is a collecting hopper, 10 is an air lock valve, 11 is a four-way joint, 12 is an air outlet pipe, 13 is a butterfly valve, 14 is a double Venturi flowmeter, 15 is a secondary air inlet pipe, 16 is a separator, 17 18 is an overflow bin, 18-1 is a return bin, 18-2 is a discharge bin, 19 is a discharge valve, 20 is a weighing scale, and 21 is an air lock valve.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The present invention includes a housing 3, a cage rotor 5, a spreader 6, a central air duct 8, a coarse powder cone 2 and a secondary powder selection mechanism; the central air duct 8 is mounted on the upper part of the housing 3, and a Distributing disc 6 is provided with feeding port 7 on the housing 3 corresponding to distributing disc 6, and cage rotor 5 is provided under distributing disc 6, at the tangent line of housing 3 corresponding to cage rotor 5 An air inlet 4 is provided in the direction; a coarse powder cone 2 is provided below the cage rotor 5, and a discharge valve 1 is connected to the lower opening of the coarse powder cone 2. The secondary sorting device includes a collection hopper 9, a four-way joint 11, a separator 16 and an overflow bin 18. The annular collection hopper 9 is arranged on the top of the coarse powder cone 2, and the upper area of the collection hopper 9 is the size of the coarse powder cone. One-sixth of the area of the upper mouth of the body 2, the lower mouth of the collecting hopper 2 communicates with the upper mouth of the four-way joint 11 through the air lock valve 10; the lower mouth of the four-way joint 11 is connected with an air lock valve 21, and the four-way The two side openings of the joint 11 are respectively connected with the secondary air inlet feed pipe 15 and the secondary fan of the separator 16; the upper port of the separator 16 is connected with an air outlet pipe 12, and a butterfly valve 13 and Double Venturi flowmeter 14; the lower port of the separator 16 is connected with the overflow bin 18 through the air lock valve 17; -1, the lower port of the discharge bin 18-2 is provided with a discharge valve 19. Discharge bin 18-2 is opposite to the lower port of air lock valve 17, and metering scale 20 is provided behind discharge valve 19;

When working, the clinker and mixed material powders that have been ground by the mill fall into the high-speed rotating spreading plate 6 through the feed port 7, and the powder is thrown to the powder selection area. Under the action of the dust collector, the fine powder enters the central air duct 8 to be extracted, and then enters the subsequent dust collector to be collected. The particle size of the fine powder is mainly 3um-50um. Most of the coarse powder directly falls into the coarse powder cone 2, and a small part enters the annular collecting hopper 9; the coarse powder entering the annular collecting hopper 9, the coarse powder directly passes through the lower mouth of the four-way joint 11 and the air lock The valve 21 falls into the coarse powder cone 2, and the rest of the powder enters the separator 16 together with the secondary air. Under the action of the secondary air, the finer powder enters the subsequent The fine powder is collected in the dust collector, and the particle size of the fine powder is mainly 10um~50um; by observing the flow rate of the double Venturi flowmeter 14 in the air outlet pipe 12, and by adjusting the butterfly valve 13, the air volume of the secondary air can be conveniently controlled , thereby controlling the particle size of the powder entering the separator 16. The coarser powder falls into the discharge bin 18-2 of the overflow bin 18 below the separator 16, is discharged from the discharge valve 19 at the bottom of the discharge bin 18-2, and is mixed in the cement after being measured by the weighing scale 20. The particle size of this relatively coarse powder is mainly 45um～80um; after the relatively coarse powder in the discharge bin 18-2 is filled, it will automatically flow into the return bin 18-1 and be discharged into the coarse powder cone 2 , and return to the mill for re-grinding together with the coarse powder. Mix the fine powder, finer powder and coarser powder separated by this classifier in proportion to get cement with wide particle size distribution.

Claims (5)

1, the high-efficient powder concentrator of wide particle diameter distribution comprises housing, cage-type rotor, spreading disk, central air hose and meal cone; Central air hose is loaded on the top of housing, and its below is provided with spreading disk and rotor, is provided with air inlet and charging aperture on housing; The below of rotor is provided with the meal cone; It is characterized in that: the secondary sorting unit that includes aggregate bin, four-way connection, separator and overflow storehouse, semi-circular aggregate bin is located at the top of meal cone, the end opening of aggregate bin interlinks by the suitable for reading of air valve and four-way connection, the both sides mouth of four-way connection connects with separator and secondary wind facies respectively, and its end opening is connected to air valve; The discharge pipe that is connected to suitable for reading of separator, the end opening of separator interlinks by air valve and overflow storehouse.

2, the high-efficient powder concentrator of wide particle diameter distribution according to claim 1, it is characterized in that: the bottom in above-mentioned overflow storehouse is inverted V-shaped, lower part, type overflow storehouse is set as out feed bin and feed back storehouse, and it is relative with the end opening of separator to go out feed bin, and the lower port that goes out feed bin is provided with bleeder valve.

3, the high-efficient powder concentrator of wide particle diameter distribution according to claim 21 is characterized in that: be provided with weigher behind the bleeder valve that goes out the feed bin lower end.

4, the high-efficient powder concentrator that distributes of wide particle diameter according to claim 1 is characterized in that: the last open area of above-mentioned aggregate bin be on the meal cone open area 1/5th to 1/8th.

5, the high-efficient powder concentrator of wide particle diameter distribution according to claim 1 is characterized in that: be provided with butterfly valve in separator discharge pipe suitable for reading.

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