JPS63224745A - Bull ring for vertical type centrifugal roller mill - 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] This invention relates to a bull ring for a vertical centrifugal roller mill,
This extends the life of the rollers and bull rings and maintains the initial crushing capacity for a long time.

(Prior art) A device in which the circumferential surface of the roller and the bull ring are coated with ceramic in order to avoid metal components from being mixed into the pulverized fine powder, and the roller is operated without contacting the bull ring (patent application No. 6)
1-217012> is provided.

In this device, the distance between the roller and the bull ring is
For example, when pulverizing silica sand with a particle size of 0.8 m/m, 0.5
m/m, but after several hours have passed, the center part (20) of the outer circumference of the roller wears out as shown in Figure 2, and as a result, an annular collar part (21) is formed on both sides of the roller. )(22> is formed, and the center part (23) of the inner circumferential surface of the bull ring is also deformed into a concave surface (24), and the crushing ability gradually decreases.

The rotational speed of this type of roller is 500 to 1500 rpm, which is about three times the spider rotation speed, and the amount of roller deformation is naturally larger than the amount of Brung's deformation.

This deformed form has nothing to do with the material of the roller or the object to be crushed, and is common even to iron rolls7.Therefore, conventionally,
As wear progresses, the annular collars (2L) on both sides of the roller
) (22), but during this time the equipment had to be stopped and the assembly and adjustment work had to be done again, resulting in a low operating efficiency of the equipment.

(Object of the Invention) The present invention aims to eliminate the above-mentioned unavoidable phenomenon, extend the continuous operation time of the rollers, and improve the operating efficiency of the apparatus.

(Solution) The present enlightened person has confirmed that the above object can be achieved by configuring the inner peripheral shape of the bull ring as shown in FIG. 2
To L.

:-1, ・I tried changing the shape of the edge of the a-ra to a different shape, but the result was a little different, and the crushing ability actually decreased.

(Structure of the Invention) The bull ring (1) of the roller mill of the present invention is constructed by attaching a ceramic link (3) in which arc-shaped ceramic plates are connected to the inner surface of a base ring (2) made of steel.

However, the ceramic link has both upper and lower edges (4) (5)
The ring-shaped flange (7) (
8> is provided.

The difference in level between the center part (6) and the flange edge is 390m in diameter.
For the bullring of m, i') 3117 Ill.

(1) is the rotating shaft, <11) is the slider, <12) is the journal, (13) is the compression device, (14) is the minimum gap adjustment device, and the roller (15) is the ceramic ring (3). ) is adjusted so that it does not come into contact with the

(16) is a roller shaft, (17) is a core metal, and (18) is a ceramic body on the outer peripheral surface of the roll. Gap between ring (1) (G)
The main part (7) is crushed in the center.

(Effects) A mill equipped with the bull ring of the present invention has a grinding capacity that is improved by 30% or more.

The reason for this is not necessarily clear, but the upper and lower flanges (7) and (8) of the bull ring cause the central part of the object to be crushed (6
This is presumed to be due to the longer residence time in ).

The roller (15) of the device to which the present invention is applied does not wear out and deform as shown in Fig. 2 even after long-term operation, but the cylindrical body wears out as a whole and its diameter becomes smaller, and the outer circumferential surface of the roller It retains its original form.

Therefore, even if the rollers (15) wear out, the gap (G) only increases, so by adjusting the gap adjustment device (14) to a predetermined interval, the initial state can be easily reproduced and efficient pulverization can be maintained. It is.

In the present invention, even if the rollers wear out, pulverization is performed over the entire length of the roller width, so there is no significant drop in pulverization efficiency even when used for a long time, and there is no need to grind the rollers for a long time, which improves the operating efficiency of the device. is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a vertical roller mill equipped with the bull ring of the present invention, Fig. 2 is an explanatory diagram showing the state of wear of conventional rollers and bull rings, and Fig. 3 shows the effects of the present invention. It is an explanatory diagram.

Claims (1)

[Claims] A bull ring of a vertical centrifugal roller mill, which is operated with a crushing roller not in contact with a bull ring, characterized in that annular flanges are protruded from both upper and lower edges of the inner periphery of the bull ring.