JP2726878B2 - Crusher - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher for materials, and more particularly to a crusher for materials such as limestone, viscosity, and cement clinker, which are raw materials for cement.

b. Conventional technology As a method of finely pulverizing “materials with brittle properties”,
Hitherto, for example, Japanese Patent Application Laid-Open No. 53-106968 has proposed a method of pre-compression grinding using a roll mill. Japanese Patent Application Laid-Open No. 63-84647 proposes a method of compressing and pulverizing two rolls in parallel in upper and lower stages.

c. Problems to be Solved by the Invention However, according to the former method, the material to be pulverized by high-pressure compression and pulverization agglomerates into a plate shape. Also, if a large lump is caught between the rolls, the force concentrates only on that part and passes through without being crushed, or in places where the force is originally unlikely to be applied to both sides of the roll, passes without crushing There is something to do. That is, a secondary mill is required because there is a plate-like material or there is a material that passes through without being pulverized. However, it is not possible to separate fine powder that should be a product. However, there is a drawback that the material is consumed or passes without being pulverized, so that the conditions on the secondary mill side have to be adjusted to the object to be pulverized that passes without being pulverized, resulting in poor efficiency and the like.

In the latter method, the crushed material crushed by the upper roll is only compressed twice by the lower roll while being in a plate shape, so that the efficiency is not improved for the cost of crushing power. Was something.

d. Means for Solving the Problems The present invention aims to provide a crusher that eliminates the above-mentioned drawbacks, significantly improves the crushing efficiency, and enables a system capable of simple and mass processing. The point is that two rolls that rotate in the biting direction are arranged in the upper stage, and two rolls that rotate in the same direction are arranged in the lower stage. At least one of the rolls has a peripheral speed equal to that of the other roll. A crusher characterized by being different from a speed.

According to the pulverizer of the present invention, the material to be pulverized is subjected to high-pressure compression and pulverization with the two upper rolls, and the material to be pulverized is further subjected to shear pulverization between the two lower rollers rotating in the same direction, and Among the upper and lower rolls of the lower roll, shear grinding is performed between rolls rotating in the same direction, and compression and shear grinding is performed between rolls rotating in the opposite direction. Also, at the upper side, when the both ends of the rolls or large lumps are bitten, etc., there is a material to be crushed which passes without being compressed and crushed, and these are crushed between the two lower rolls or the upper side. Then, the roll between the upper and lower rolls is compressed and sheared again. Thus, all of the objects to be crushed are subjected to compression and shear crushing at least once.

In the illustrated embodiment, 1 is a material supply hopper, 2, 3
Denotes an upper roll, which is pressed in the direction indicated by the white arrow. Pressing is performed, for example, by pressing the rotary shaft bearing of the roll with a hydraulic press device. A line arrow along a white arrow indicates that the rolls 2 and 3 can move in opposite directions. Both rolls 2 and 3 are supported while maintaining a high compression force. Of course, both rolls are provided with stoppers acting in the direction approaching each other so that the rolls do not come into direct contact.

The lower rolls 4 and 5 rotate in the same direction, and the roll 4 rotates at a fixed position. The roll 5 is pressed against the roll 4 in a direction indicated by a white arrow with a low-pressure compression force, and the pressing means and the like are the same as those of the upper roll. Thus, a low pressure compressive force region is formed between the lower rolls and between the lower roll and the upper roll.

Now, the material 6 to be ground from the material supply hopper 1 is
Feed between 3 and crush with high pressure.

The obtained crushed material 7 undergoes crushing action and shear crushing between the rolls 2 and 4 and between the rolls 4 and 5 rotating in the same direction,
Powdered. Further, the material to be crushed is again compressed and sheared and crushed between the rolls 3 and 5 to obtain crushed objects 8, 9 and 10 having an average particle size.

At that time, at least the peripheral speed of one of the rolls is changed. For example, if the peripheral speed of the upper roll 3 is set higher than that of the other rolls, a shear force acts between all the rolls,
Efficient grinding is performed.

Further, for example, if the peripheral speed of the lower roll 5 is set lower than that of the other rolls, the discharge between the rolls 3 and 5 becomes worse, and the shear pulverization between the rolls 4 and 5 and between the rolls 2 and 4 becomes more efficient. Often done.

When the pressure is high, the difference in peripheral speed between the rolls rotating in the opposite direction is small because the shear force is strong and the roll surface wear increases, and when the pressure is low, the shear force is weak and the roll surface wear is reduced. Since it becomes smaller, it is desirable to make it larger.

Roll diameter 1000 mm, roll width 1000 mm, roll peripheral speed of rolls 2, 3, and 4 1.2 m / s, roll peripheral speed of roll 5 is 1.0 m / s, compression force between rolls 2 and 3 1000 kgf / cm ² , roll 2 100kgf / cm ² between rolls 4 and 4 and rolls 4 and 5, 25 between rolls 3 and 5
When the cement clinker was compressed and pulverized at 0 kgf / cm ² , the particle size distribution of the obtained pulverized material was 0%, 5 m
The residual amount of the sieve was 1%.

e. Effects of the Invention The present invention makes it possible to significantly improve the pulverizing efficiency. By using the pulverizer according to the present invention, the object to be pulverized is reduced to a certain particle size or less, and the conditions of the secondary mill are adjusted to the optimum pulverizing conditions. Crushing efficiency can be significantly improved. For example, the material 7 to be pulverized by high-pressure compression and pulverization by the two upper rolls 2 and 3 is further pulverized by the pulverizing action and shear pulverization between the lower rolls 4 and 5. And, between the upper and lower rolls 2, 3 and the lower and upper rolls 4, 5, between the rolls 2, 4 rotating in the same direction, similarly undergoes crushing action and shear crushing,
The rolls 3 and 5 rotating in opposite directions undergo compression grinding. Also, for example, if the peripheral speed of the upper roll 3 is set higher than that of the other rolls, a shearing force acts between all the rolls, and efficient pulverization is performed. Also, the lower roll 5
If you make the peripheral speed of other rolls slower, roll 3,
The discharge between the rolls 5 becomes worse, and the shear pulverization between the rolls 4 and 5 and between the rolls 2 and 4 is efficiently performed. Thus, various effects are brought about by variously changing the peripheral speed of at least one roll.

[Brief description of the drawings]

 The drawing is a view conceptually showing the crusher of the present invention. 1 ... hopper, 2,3 ... upper roll, 4,5 ... lower roll.

Claims (1)

(57) [Claims] 1. An upper stage comprises two rolls 2, 3 rotating in the biting direction, and a lower stage comprises two rolls 4, 5 rotating in the same direction, and among the rolls 2, 3, 4, 5, A pulverizer characterized in that at least one roll is provided with means for making its peripheral speed different from that of other rolls.