JPH04281858A - Grinder - Google Patents

Abstract

PURPOSE:To enhance the production capacity of the overall grinder than heretofore by drastically enhancing throughput of a selector in comparison with the case for introducing the pulverized material to a vibrating screen and sieving it as in the conventional manner. CONSTITUTION:While a dispersion plate 39 is rotated, classification air 34 is introduced into an air introducing port 35 and pulverized material 5 supplied from a preliminary grinder is introduced from an introduction chute 43. Classification air 34 ascends through the inside of a easing 32. The pulverized material 5 is dispersed in the radial direction from the central part of the dispersion plate 39 by centrifugal force and blown up by the classification air 34. At this time, fine powder 11 contained in the pulverized material 5 is accompanied with the flow of the classification air 34 and raised. Then this fine powder is introduced into a cyclone 44 and collected therein and carried to a ball mill. Further coarse powder 9 contained in the pulverized material 5 is not accompanied with the flow of the classification air 34 and falls. This coarse powder is taken out from a segmenting nozzle 37 and returned to the preliminary grinder.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizer used in cement production and the like.

0002

BACKGROUND OF THE INVENTION Conventionally, raw materials have been pulverized using ball mills in cement manufacturing equipment and the like.

However, although the ball mill has excellent pulverization performance, it is inefficient at pulverizing raw materials, and the production capacity cannot be increased by directly introducing raw materials into the ball mill.

[0004] Therefore, in recent years, raw materials have been coarsely pulverized in advance using a preliminary pulverizer as a preparatory step to the pulverizing process using a ball mill, as in the pulverizing apparatus shown in FIG.

That is, the raw material 2 from the raw material hopper 1 is introduced into a preliminary crusher 4 such as a crusher or a roller mill via a scale conveyor 3 for coarse crushing, and the coarsely crushed crushed material 5 is transferred to a feeder 6 and a bucket elevator. Coarse powder 9 that is passed through a sorter 8 through a sorter 7 and sorted by the sorter 8
is returned to the pre-pulverizer 4 via the conveyor 10 etc., and the fine powder 11 sorted by the sorter 8 is introduced into the ball mill 13 via the conveyor 12 etc. to be finely pulverized. The pulverized material 5' finely pulverized in the ball mill 13 is guided to a classifier 16 via a bucket elevator 14, an air slide 15, etc., and is classified into refined powder (fine powder) 17 and fine powder 18 by the classifier 16. , return the fine powder 18 to the ball mill 13 via the air slide 19,
Further, the refined powder 17 is taken out as a product via an air slide 19.

[0006] In the above-mentioned crushing apparatus, conventionally,
A vibrating sieve was used as the sorter 8.

An example of the vibrating sieve will be explained below with reference to FIG.

A vibration container 21 is mounted on a pedestal 20 with a vibration isolating support 22
The vibrating container 21 is provided with screens 24a to 24e having different mesh sizes in multiple stages (five stages) from the upper stage to the lower stage. The sieves are arranged in an inclined manner so that the size of the sieve mesh becomes smaller as the size of the sieve increases.Furthermore, a vibration generating device (for example, a Uras motor device that generates vibration by rotating an eccentric wheel) 25 is provided on the lower side of the vibrating container 21. is attached, and the vibration generator 25 causes the vibration container 21 to vibrate. In the figure, reference numeral 26 indicates a pulverized material inlet, 27 a pulverized material collision plate, 28 a fine powder take-out chute, and 29 a coarse powder take-out chute.

[0009] Crushed material 5 from pre-pulverizer 4 (see FIG. 3)
During sieving, each screen 24a to 24e is vibrated together with the vibration container by the vibration generator 25, and then the crushed material 5 from the preliminary crusher 4 is passed through the crushed material inlet 26.
When the pulverized material 5 collides with the pulverized material collision plate 27 and is dispersed, the pulverized material 5 ( The coarse powder) falls from the inclined lower end of the screen 24a and reaches the coarse powder take-out chute 29. On the other hand, the crushed material 5 that has passed through the sieve mesh of the first stage screen 24a and fallen onto the second stage screen 24b is treated by the second stage screen 24b in the same manner as in the case of the first stage screen 24a. Vibratory sieving. In this way, the screens are sequentially sieved from the first stage (top stage) screen 24a with the largest sieve mesh (coarse mesh) to the fifth stage (bottom stage) screen 24e where the sieve mesh is the smallest (fine mesh). Powder 11 comes from fine powder take-out chute 28, and coarse powder 9 comes from coarse powder take-out chute 29.
are taken out from each.

0010

However, the above-mentioned vibrating sieve has a drawback of low throughput, and there is a problem in that the production capacity of the entire crushing apparatus is reduced by the throughput of the vibrating sieve.

Furthermore, since the screens 24a to 24e of the vibrating sieve rapidly wear out and the screens 24a to 24e require maintenance frequently, the operation of the crushing device must be stopped every time the maintenance is performed. There was a problem that efficiency decreased.

Furthermore, since vibrations are generated in the vibrating screen, the strength of the building must be increased so that the vibrations do not reach peripheral equipment, which poses the problem of increasing the construction cost of the building.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a crushing device equipped with a sorter that can solve all of the above-mentioned problems.

[0014]

[Means for Solving the Problems] The present invention separates the pulverized material coarsely crushed by a pre-pulverizer into coarse powder and fine powder by a sorter, and returns the selected coarse powder to the pre-pulverizer. In the pulverizing apparatus, the sorted fine powder is introduced into a ball mill for fine pulverization, and the sorter has an air inlet at the lower part through which classified air can be introduced, and an air inlet at the lower end. a casing having a coarse powder cutting nozzle for cutting out coarse powder and having a cross-sectional area of a flow passage increasing upward; a dispersion plate rotatably disposed above the air inlet in the casing; It is characterized by comprising an input chute for inputting the crushed material from the pre-pulverizer into the center of the upper surface of the distribution plate, and a cyclone connected above the distribution plate of the casing for collecting fine powder. This is related to the crushing equipment.

[0015]

[Operation] Therefore, in the present invention, when the distributed plate is rotated and classified air is introduced into the air inlet, and when the crushed material from the pre-pulverizer is introduced from the input chute, the classified air rises inside the casing, and on the other hand, The pulverized material is dispersed in the radial direction from the center of the dispersion plate by centrifugal force, and blown up by the classified air rising inside the casing.

At this time, the fine powder in the pulverized material rises along with the flow of the classified air, flows into the cyclone together with the classified air, is collected, and is conveyed to the ball mill.

[0017] Also, the coarse powder in the pulverized material cannot survive the flow of the classification air and falls, is taken out from the coarse powder cut-out nozzle, and returned to the pre-pulverizer.

[0018]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention,
In the figure, parts given the same reference numerals as in FIG. 3 represent the same parts.

In the crushing device 30, which is constructed in substantially the same manner as the crushing device shown in FIG.
An air classification type separator 31 as shown in FIG.

[0021] Note that the sorting machine 31 is used instead of the conventional vibrating sieve.
Since the configuration other than the adoption of the pulverizer is the same as that of the pulverizer shown in FIG. 3, the explanation thereof will be omitted.

The sorting machine 31 will be explained in detail below.

In the figure, numeral 32 indicates a casing of the sorting machine 31, and the casing 32 has an air inlet 35 at the bottom for introducing the classified air 34 from the air fan 33, and an air inlet 35 for introducing the classified air 34 from the air fan 33. It has an annular air duct 36 that guides the powder 34 in the circumferential direction, and has a coarse powder 9 at the lower end.
It has a shape in which the cross-sectional area of the flow path increases upward, and has a coarse powder cutting nozzle 37 for cutting out coarse powder.

[0024] A large number of air introduction vanes 38 are attached to the inner circumferential portion of the air duct 36 and arranged in an annular manner and inclined in the circumferential direction, so that the classified air 34 can flow in as a swirling flow. .

Further, above the air inlet 35 in the casing 32, a propeller-shaped dispersion plate 39 ( (see FIG. 2), and the dispersion plate 39 is rotatably supported by a drive shaft 42 that is connected to a drive device 40 installed on the upper surface of the casing 32 via a reduction gear 41 so that torque can be transmitted. has been done.

Further, in the upper part of the casing 32, a charging chute 43 for charging the crushed material 5 from the preliminary crusher is inserted into the center of the upper surface of the dispersing plate 39.

Furthermore, a cyclone 44 capable of collecting the fine powder 11 is connected above the dispersion plate 39 of the casing 32, and the classified air 34 that collects the fine powder 11 by the cyclone 44 is The air is returned to the air fan 33 through an air pipe 45 inserted into the center of the upper part of the cyclone 44 for circulation.

In the figure, reference numeral 46 denotes a chevron-shaped air rectifier disposed directly below the center of the dispersion plate 39 so as to rectify the swirling flow of the classified air 34 flowing in from the air duct 36 and raise it.
47 is a classified air 34 that swirls and rises inside the casing 32.
This figure shows a flow rate adjustment gate that adjusts the flow rate by narrowing down the cross-sectional area of the flow path.

Then, while rotating the distribution plate 39, the classified air 34 is introduced from the air fan 33 into the air inlet 35, and when the crushed material 5 from the preliminary crusher is introduced from the input chute 43, the classified air 34 passes between the air introduction vanes 38 of the air duct 36 and rises as a swirling flow.On the other hand, the crushed material 5 is dispersed in the radial direction from the center of the upper surface of the dispersion plate 39 by centrifugal force, and the swirling flow The air is blown up by the rising classified air 34.

At this time, the fine powder 11 in the pulverized material 5 is
Rising along with the flow of the classified air 34, the classified air 34
At the same time, it flows into the cyclone 44 from a tangential direction to create a swirling flow, is separated from the classified air 34 by the centrifugal force of the swirling flow, is taken out from the lower end of the cyclone 44, and is conveyed to the ball mill via the conveyor 12 etc. .

Further, the coarse powder 9 in the pulverized material 5 cannot ride the flow of the classification air 34 and falls, is taken out from the coarse powder cut-out nozzle 37, and is returned to the pre-pulverizer via the conveyor 10 or the like. It will be done.

Therefore, according to the above embodiment, the throughput of the sorter 31 can be greatly improved compared to the conventional case where the crushed material 5 is sieved using a vibrating sieve.
The production capacity of the crushing device 30 can be improved compared to the conventional one.

[0033] Furthermore, since a screen that requires frequent maintenance like a conventional vibrating sieve is not used, the crushing device 30
The frequency of stopping the operation of the sorting machine for maintenance work is significantly reduced, and operational efficiency can be greatly improved.

Furthermore, since vibrations are not generated as in conventional vibrating screens, there is no need to increase the strength of the building excessively, and the construction cost of the building can be significantly reduced compared to conventional vibrating screens.

Furthermore, with the conventional vibrating sieve, it was not possible to set the dividing point to a particle size of 2 mm or less due to the manufacturing limitations of the sieve mesh of the screen, but by adopting the air classification type separator 31, , it becomes possible to set the dividing point to a particle size of 2 mm or less, if necessary.

It should be noted that the crushing apparatus of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[0037]

Effects of the Invention As explained above, the crushing apparatus of the present invention can produce various excellent effects as described below.

(I) Since the throughput of the sorter can be greatly improved compared to the conventional case where the crushed material is sieved using a vibrating sieve, the production capacity of the entire crushing device can be improved more than before. Can be done.

(II) Since screens that require frequent maintenance like conventional vibrating sieves are not used, the frequency of stopping the operation of the crusher for maintenance work on the sorting machine is significantly reduced, and the operational efficiency is greatly improved. can be improved.

(III) Since vibrations are not generated as in conventional vibrating screens, there is no need to increase the strength of the building excessively, and the construction cost of the building can be significantly reduced compared to conventional vibrating screens.

(IV) With conventional vibrating sieves, it was not possible to set the dividing point to a particle size of 2 mm or less due to the manufacturing limitations of the screen mesh, but by adopting an air classifier, , it becomes possible to set the dividing point to a particle size of 2 mm or less, if necessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of the distribution plate of FIG. 1;

FIG. 3 is a schematic diagram of a conventional crushing device.

FIG. 4 is a side view showing an example of the vibrating sieve that is the sorter in FIG. 3;

[Explanation of symbols]

4 Preliminary crusher 5. Crushed material 9 Coarse powder 11 Fine powder 13 Ball mill 30 Grinding device 31 Sorting machine 32 Casing 34 Classified air 35 Air inlet 37 Coarse powder cutting nozzle 39 Dispersion plate 43 Input sheet 44 Cyclone

Claims (1)

[Claims] Claim 1: A pulverized material coarsely pulverized by a pre-pulverizer is separated into coarse powder and fine powder by a sorter, and the sorted coarse powder is returned to the pre-pulverizer and re-pulverized, and the pulverized material is crushed by the pre-pulverizer. In the pulverizing device, the fine powder is introduced into a ball mill for fine pulverization, and the sorter has an air inlet at the bottom for introducing classified air, and a lower end for cutting out the coarse powder. A casing having a coarse powder cutting nozzle and having a cross-sectional area increasing upward, a dispersion plate rotatably disposed above the air inlet in the casing, and a central portion of the upper surface of the dispersion plate. A crushing device comprising: an input chute for inputting the crushed material from the preliminary crusher; and a cyclone connected above the dispersion plate of the casing for collecting fine powder.