JPS583652A - Milling method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulverizing method and apparatus in which a pulverizer or a pulverizing roller of a vertical roller mill for pulverizing cement raw materials, clinker, etc. is vibrated up and down.

Tube mills, vertical roller mills, and the like are known as pulverizers for pulverizing cement raw materials and the like.

Tube mills are suitable for fine pulverization, but the energy required for pulverization is large, and the installation area is limited to vertical rollers.For example, in the case of cement clinker, iron ore, etc., the disadvantage is that the pulverizing rollers are subject to severe wear, but they can handle up to about 10 inches of 88μ sieve residue. It is suitable for coarse grinding, and in recent years it has often been used for grinding and grinding cement raw materials.

However, it cannot be passed through finer pulverization, for example, about 1 inch of residue on an 88μ sieve, and has the disadvantage that pulverization requires a large amount of pulverization energy.

The present invention has been made to solve the above-mentioned problems, and is an energy-saving grinding method and apparatus that maintains the efficient coarse grinding function that is the advantage of the vertical-mouthed mill, and also enables fine grinding. It provides a vertical roller pulverizing the material caught between the rollers by vertically vibrating at least one of the pulverizer or the pulverizing rollers, and providing a vibrating means in the pulverizer; It is.

Note that, for example, the present invention applies minute vibrations to the crushing roller,
When a variable stress is applied to the object to be crushed in addition to the static stress caused by the pressing force of the crushing roller, compressive stress and tensile stress are generated in the object to be crushed, and relative frictional force and shear force between the objects to be crushed are generated. This is based on the knowledge that pulverization progresses efficiently by promoting peeling of particle surfaces and chipping of particle corners.

The present invention will be explained below based on examples thereof.

Figure 1 shows a vertical roller crusher 1 for carrying out the method of the present invention.
This is a complete cutaway diagram of. In the figure, - indicates a vertical roller mill, which consists of a rotating shaft 8, a pulverizer 2 that is horizontally driven to rotate by a drive source 5 via a reduction gear 4, and a pulverizer 2 that is rotatably attached to a roller shaft 7. It consists of a roller 6 and a pressing means 8 for the crushing roller 6, and the crushing roller 6 is pressed against the upper surface of the crusher 2. This crushing device 1 consists of a cam plate 12 fixed to the output shaft of a driving means 11 mounted on a base 10 of this vertical roller mill 20, and a cylindrical follower 18 fixed to the roller shaft 7. A vibrator 9 is attached to apply vibrations generated by the rotation of the cam plate 1 to the crushing row 26 via the roller shaft 7. Note that the vibrator 9 is not limited to the above-mentioned mechanical type, but may be a known electric type, such as one that utilizes electromagnetic force.

According to the above-mentioned configuration, the particles are moved toward the vicinity of the center of the crusher 2, and are caught between the crushing row 26 and the crusher 2 to be crushed. During this crushing, when the cam plate 12 is rotated by the driving means 11 described above, the follower 18 is rotated due to the shape of the cam plate.
moves up and down, and as a result, the grinding roller vibrates up and down on the grinder 2 using the shaft 19 as a fulcrum. The object 14 to be crushed is coarsely crushed by the vibration of the crushing row 26, and at the same time, the frictional force and shear force between the particles in the particle layer bitten by the crushing roller 6 and the crusher 2 are further enhanced. It is finely pulverized by
The finely pulverized material 6 is brought to the outer periphery of the pulverizing dish 2 by centrifugal force, falls onto an annular and inclined air sliding conveyor 16 provided on the periphery of the pulverizing dish 2, and is discharged from the machine via the discharge port 17. is discharged.

Instead of the air sliding conveyor 16 described above, the material to be crushed 14 may be scraped up by a bottom plate 18 (not shown), but if the air sliding conveyor 16 is used, the material 14 to be crushed may be scraped up by a roller (not shown). By blowing air out of the lower blade 1 of the cloth can, the material to be crushed is fluidized, and the material to be crushed 6 that has fallen from the entire circumference of the crusher 2 can be quickly discharged to the outside of the machine.

In the above-mentioned embodiment, the crusher 2 has a horizontal surface, but the present invention is a crusher as shown in FIG. In addition, it goes without saying that the crushing roller can be applied not only to the roller mill shown in FIG. 1, but also to conical roller or tire-shaped roller mills.

Figure 8 shows vertical roller crusher 1 equipped with different vibrators.
FIG. The difference from the grinding apparatus of the invention described above is that the grinding roller 6 is not vibrated, but the flour pot dish 2 is vibrated up and down.

The structure consists of a bearing 2 that supports the crusher 2 so that it can be moved up and down.
5, a support means 27 consisting of a joint 26 for vertically displacing and rotationally driving the crusher 2, and a vibrator 9 for generating mechanical or electrical vibrations at the bottom of the crusher 2. ing. This vibrator 9- includes, for example, an electromagnet 21 mounted on a base 10 and a magnet 2 attached to the bottom surface of the crusher 2.
By applying alternating current to the electromagnet 21), attractive force and repulsive force are applied to the magnet 22 to move the crusher 2 up and down.

Therefore, in the present invention, the crushing roller 6 is only pressed against the upper surface of the crusher 2 by the pressing means 8.

The operation of the present invention is basically the same as that of the crushing apparatus of the invention described above.

FIG. 4 shows an example of a crushing plant equipment using the crushing apparatus 1 of the above-described invention. The material to be crushed 14 stored in the hopper 81 is weighed by a weighing machine 82 and cut out, and then supplied to the crushing apparatus 1 of the present invention by a belt conveyor 88. The material to be crushed discharged from the crushing device 1 is transported to a conveyor 84.
, 85 and 86 to the classifier 87. Here, the material to be crushed 14 is classified into fine powder and coarse powder, the fine powder is carried out as a product to the next process by a conveyor 88, and the coarse powder is fed into the crushing device 1 again through a chute 89.

A small amount of gas is drawn in for the purpose of creating a negative pressure inside the crushing device 1, and is guided through a duct 40 to a dust collector 41 by an induced fan (not shown), where it is removed and then released into the atmosphere. The collected dust is fed to the conveyor 88 to be sent to the next process together with fine powder, or if the dust is coarse, it is returned to the crushing device 1.

As described above, the present invention provides a vertical roller mill having a horizontally rotating pulverizer and a pulverizing roller pressed against the upper surface of the pulverizer and driven to rotate. In order to pulverize the pulverized material, at least one of the pulverizer or the pulverizing roller is vibrated up and down to pulverize the material, so that it can be used not only for coarse pulverization but also for hard and abrasive materials such as cement clinker. For example, the residue on the 44μ sieve is about 1% AlO (the residue on the 88μ sieve is 1%).
It is possible to perform fine pulverization to a certain degree, and it can have a pulverization capacity equivalent to that of existing tube mills and vertical roller mills.

[Brief explanation of the drawing]

Fig. 1 is an overall cross-sectional view of a vertical roller crusher that implements the method of the present invention, Fig. 2 is a cross-sectional view of the main part of a bowl mill crusher having a bowl-shaped crusher, and Fig. 8 is equipped with a different vibrator. FIG. 4, which is a cross-sectional view of the main part of the vertical roller crusher, is an example of a crushing plant facility using the crusher of the present invention. 1...Vertical roller crusher, 2...Crusher, 6...
- Grinding roller, 7... Roller shaft, 8... Pressing means,
9... Vibrator, lO... Base, 11... Driving means, 12 River cam plate, 1B... Follower, 14... Object to be crushed, 16... Air sliding conveyor, 20...
・Vertical roller mill, 21...Electromagnet, 22...Magnet, 27...Support means Patent attorney Katsutoshi Yoshimura

Claims (7)

[Claims] (1) In a vertical roller mill having a horizontally rotating pulverizing plate and a pulverizing roller that is pressed against the top surface of the pulverizing plate and rotates drivenly, the object to be crushed is caught between the pulverizing plate and the pulverizing roller. A method of pulverizing by vertically vibrating at least one of the pulverizing plate or the pulverizing roller. (2) A vertical roller mill having a horizontally rotating grinding plate, a grinding roller that is pressed against the upper surface of the grinding plate and rotates drivenly, and a means for pressing the kernel grinding roller against the grinding plate, wherein the grinding A crushing device characterized in that a vibrator is interposed in the pressing means of the roller. (3) The vibrator consists of a cam plate rotated by a driving means fixed to a base, and a cylindrical follower that moves up and down on the cam plate and is fixed to the rotation shaft of the crushing roller. A crushing device according to claim 2, characterized in that: (4) The crushing device according to claim 2 or 8, characterized in that an annular and inclined air sliding conveyor is disposed at the lower part of the outer periphery of the crushing plate. (5) A vertical roller mill having a horizontally rotating grinding plate, a grinding roller pressed against the upper surface of the grinding plate and driven to rotate, and means for pressing the grinding roller against the grinding plate, A pulverizing device, characterized in that a vibrator is disposed on the lower surface of the pulverizing plate, and means for supporting the pulverizing plate so as to be vertically movable is interposed therebetween. (6) The crushing device according to claim 5, wherein the vibrator comprises an electromagnet fixed to a base and a magnet attached to a lower surface of a crushing dish. (7) The crushing device according to claim 5 or 6, characterized in that an annular and inclined air sliding conveyor is disposed at the lower part of the outer periphery of the crushing plate.