JP2967435B2 - Grinding method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing method and apparatus used for pulverizing brittle materials such as cement clinker.

[0002]

2. Description of the Related Art Conventionally, as a prior art of a continuous pulverizing method of a brittle material such as a cement clinker and a pulverizing apparatus, there is an invention described in JP-A-59-160541.
For example, in the case of pulverizing a cement clinker, this method is performed by a configuration as shown in FIG. 3 as an example. In the figure, a is a roll machine, and this roll machine a uses a strong press in which the pressure of the roll is 2 t or more per centimeter of roll length. B indicates a screen, and c indicates a classifier. d is a supply device such as a hopper, and e is a cement clinker.

[0003] The cement clinker e is supplied from a supply device d to a roll machine a, and is ground in the roll machine a. A ground product h composed of flakes f and fine powder g produced by the grinding is subjected to a sieving operation on a screen b. The fine powder g passing through the screen b is supplied to the classifier c, while the flakes f remaining on the screen b are
It is removed from the top and returned to the roll machine a.
Next, in the classifier c, the fine powder g is classified,
It is divided into fine powder i and coarse powder j. The fine powder i is a product. On the other hand, the coarse powder j is returned to the roll mill a for further subdivision.

[0004] Such pulverization methods and apparatus are said to have the advantage of requiring less power consumption and equipment costs than conventional methods and apparatus.

[0005]

However, the above-mentioned prior art method and apparatus have the following drawbacks.

The first problem is that the screen b is clogged with the operation of the device. Screens are generally unavoidable for clogging,
The same applies to this apparatus. If clogging occurs on the screen b, the continuous operation of the entire apparatus is hindered. During the operation for removing the clogging of the screen, the entire apparatus must be stopped. No.

As another problem, the flakes f that have not passed through the screen b as described above are returned to the roll machine a. However, since the flakes f are not fine particles such as the fine powder g and are relatively large, The material to be crushed e of the rolling machine a
When supplied above, the material e rides on the material to be crushed e, but there is little behavior that the space between the materials to be crushed e is naturally filled by gravity. Generally, in a rolling machine, the material to be ground is
It is preferable that the voids are filled with the granular material so that the crushing force can be applied almost all over each part of the material to be crushed during crushing. If crushing is performed in such a state, the whole is crushed at once, and the crushing efficiency can be increased.

Another problem is that the flakes f are originally formed by compressing powders and granules, and the powders and granules also contain fine powders which do not need to be further pulverized. Refluxing the flakes f to the roll machine a inevitably causes energy loss in the roll machine a. In other words, the fine powder contained in the flakes f is to be immediately converted into a product through the classifier c without being refluxed to the roll machine a, so that the work efficiency is obviously poor. Another problem is that roll mills are generally configured to form flakes, but not to break flakes. Therefore, the operation of breaking the flakes with a roll machine is inefficient.

The present invention has been made to solve such various problems, and an object of the present invention is to provide a pulverizing method and apparatus using a roll machine, a sieve, and a classifier without causing clogging of the sieve. It is another object of the present invention to provide a crushing method and a crushing apparatus which does not hinder the whole apparatus due to the clogging. Amend the low efficiency, and in return, reflux the granules,
The granules are allowed to naturally enter by gravity between the materials to be crushed on the roll machine, whereby the crushing efficiency of the roll machine can be increased, and the fine powder contained in the flakes f can be removed as described above. The work efficiency of the entire apparatus can be increased by directly feeding the above-mentioned classifier from the sieve without reflux to the roll machine, and the fine powder contained in the flakes f is not pulverized again in the roll machine a. by,
An object of the present invention is to provide a pulverizing method and apparatus capable of reducing the load on the roll machine a.

[0010]

Means for Solving the Problems The present invention for achieving the above object is first described with respect to a pulverizing method.
The material to be pulverized is pulverized by a roll machine, and the pulverized product is supplied to a rotary bar sieve in which a number of bar-shaped or line-shaped obstacle members are provided at predetermined intervals on a rotary base, and the rotary bar sieve supplies the pulverized product. Separating the fine powder and pulverizing the flakes in the pulverized product, combining the fine powder in the powder with the fine powder by the rotary bar sieve, forming and separating the combined fine powder, separating the remaining powder To a roll machine, supplied together with the material to be ground, and the combined fines, in a classifier provided in the subsequent stage of the rotary bar sieve, classify the combined fines into fines and coarse powder, the fines as a product, Further, there is provided a pulverizing method comprising supplying the coarse powder to the roll machine.

Next, the apparatus of the present invention will be described. In the apparatus, a rotary bar sieve having a plurality of bar-shaped or line-shaped obstacle members provided at predetermined intervals on a rotary base is provided at the subsequent stage of a roll mill for grinding a material to be ground. And a classifier provided downstream of the rotary bar sieve.

[0012]

The material to be pulverized is first pulverized in the roll machine. Then, the pulverized product is supplied to the next rotary bar sieve.
As a result of the rotating bar sieve being rotated at a predetermined rotation speed, a substantially predetermined gap is formed between a large number of bars, and the fine powder in the crushed product fills the gap with the gap between the bars. Fall through and be separated. Since the flakes in the crushed product are larger than the fine powder and cannot pass through the gap between the bars, the flakes are beaten and crushed by the bar, or are crushed or hit by a peripheral wall formed around the bar. And crushed. The flakes are thus divided into fines and powders larger than the fines. The fine powder passes through the gap between the bars and merges with the fine powder that has already passed to form a merged fine powder, which is sent into the classifier.

The remaining powder, excluding the fine powder, is urged by the rotating bar and is blown out of the area of the bar formed by the plurality of bars, thereby dropping from the gap of the bar. And separated and collected from the combined fine powder.
Then, the recovered powder is supplied again to the pulverized material which is supplied to the roll machine. Then, the powder enters the gaps and spaces between the pulverized materials and enters there. For this reason, the material to be crushed is almost uniformly crushed without partial bias since the crushing force is immediately applied to all parts of the material to be crushed because the crushing force is immediately applied to all parts of the material to be crushed when crushing by a roll machine. can do. Therefore, the pulverization efficiency can be increased.

Further, as described above, the flakes are decomposed due to the impact of the bar or the impact on the peripheral wall, and the fine powder in the components is separated and sent to the classifier. As a result, the product recovery rate can be increased. In addition, since the roll machine does not need to grind the flakes, power consumption can be greatly reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a supply device for a material to be ground 2, and 3 denotes a roll machine. Then, this roll machine 3 is similar to the roll machine shown in the prior art, in which the pressure of the roll is
A strong rolling machine is used that has a roll length of 2 t or more per centimeter. Numeral 4 denotes a pulverized product obtained by the rolling machine 3. When the material to be ground 2 is a cement clinker, the pulverized product 4 includes fine powder 5 and flakes 6.

The pulverized product 4 is supplied to a rotary bar sieve 7 provided at the subsequent stage of the rolling machine 3. Referring to the rotary bar sieve 7, as shown in FIG. 2, the rotary bar sieve 7 has a plurality of bar-shaped or line-shaped obstacle members 9 radiated on a plate-shaped rotary base 8 at predetermined intervals. The collection chamber 10 for the fine powder 6 is formed below the above. The rotating base 8 is rotatably provided on a rotating shaft (not shown) and is rotated by a driving device 11. Therefore, the interval between the obstacles 9 can be changed in use depending on the speed of the rotation. That is, the faster the rotor rotates, the narrower the gap acts. The obstruction member 9 may be in the form of a bar such as a rod or the like or a line in which a wire or the like is provided with both ends tensioned.

Numeral 12 denotes a material supply portion, numeral 13 denotes a side wall formed in a spiral shape, and numeral 14 denotes an inclined wall formed at the center at the highest position and at the terminal portion at the lowest according to the spiral shape of the side wall 13. Vibration is caused by a vibration device (not shown) in the passage. Reference numeral 15 denotes a supply pipe whose lower end is opened at the center of the side wall 13. And
The crushed product 4 is supplied from the supply pipe 15 onto the inclined passage 14, the inclined passage 14 is vibrated by a vibration device (not shown), and the crushed product 4 is previously rotated from its open end 16. It is dropped on the obstacle member 9. Therefore, the fine powder 5 in the pulverized product 4 is moved from the gap 17 of the obstacle member 9 to the collection chamber 10 by the moving member 18 and collected from the drop port 19.

On the other hand, the flakes 6 in the crushed product 4
Cannot enter the gap 17 of the obstacle 9 and is crushed by the impact of the obstacle 9. Alternatively, it is skipped and crushed by colliding with the peripheral wall 20. Then, of the crushed pieces, those having a size equal to or smaller than the fine powder 5 pass through the gap 17 between the obstacle members 9, fall into the collecting chamber 10, join the fine powder 5, and join the fine powder 5. 21 (see FIG. 2).

On the other hand, when it is impossible to pass through the gap 17,
The relatively large powder is repelled by the obstacle 9 and enters the separation chamber 22 formed outside the obstacle 9, and the separation port 2
3 The combined fine powder 21 taken out from the dropping port 19 is supplied to a classifier 24, where the fine powder 25 is classified into a fine powder 25 and a coarse powder 26. Reflux to 3. The powder taken out from the separation port 23 is returned to the roll machine 3. In this case, instead of the roll machine 3,
Reflux to the supply device 1 may be performed, and the present invention includes such a case. In this case, the powder enters the gaps between the materials to be crushed and fills the gaps.

[0020]

According to the present invention, a rotary bar sieve is provided at the subsequent stage of the rolling machine, and the pulverized product pulverized by the rolling machine is processed by the rotary bar sieve. The flakes are crushed, and the fine powder in the flakes is separated by being combined with the fine powder in the crushed product, and the powder generated by the crushed flakes is refluxed to the roll machine, thereby clogging the sieve. Thus, it is possible to provide a pulverizing method and a pulverizing method which does not cause a trouble such as stoppage of the whole apparatus due to clogging. In addition, by filling the powder into the gaps of the material to be ground and pulverizing the same in a roll machine, the pulverization efficiency in the roll machine can be increased. Further, the recovery rate of fine powder can be increased. Further, the inefficient work of pulverizing the flakes in the roll machine for forming flakes can be omitted, so that the operation of the roll machine can be made effective.

[0021]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention and schematically showing a pulverizing method.

FIG. 2 is a perspective view showing an embodiment of the present invention and schematically showing a rotary bar sieve.

FIG. 3 is a block diagram showing a conventional pulverizing method.

[Explanation of symbols]

 2 Material to be crushed 3 Roll machine 4 Crushed product 5 Fine powder 6 Flake 7 Rotating bar sieve 8 Rotating base 9 Obstacle member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B02C 21/00-23/40 B02C 4/00-4/44

Claims (2)

(57) [Claims] 1. A material to be pulverized is pulverized by a roll machine, and the pulverized product is supplied to a rotary bar sieve having a plurality of bar-shaped or line-shaped obstacle members provided at predetermined intervals on a rotating base, and the rotary bar sieve is provided. By separating the fine powder in the pulverized product and pulverizing the flakes in the pulverized product, the fine powder in the powder is combined with the fine powder by the rotary bar sieve to form and separate the combined fine powder. The above powder is supplied to the roll machine together with the material to be pulverized, and the combined fine powder is classified into a fine powder and a coarse powder by a classifier provided at a stage subsequent to the rotary bar sieve. A pulverizing method, wherein powder is used as a product, and the coarse powder is supplied to the rolling machine. 2. A roll machine for crushing a material to be crushed,
A pulverizing device, comprising: a rotating substrate, a rotating bar sieve having a number of bar-shaped or line-shaped obstacle members provided at predetermined intervals, and a classifier provided downstream of the rotating bar sieve.