JPS6236523Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vertical mill that uses a grinding roller to grind raw materials supplied onto a rotary table. The present invention relates to a dust seal device for a crushing roller bearing to prevent dust from occurring.

A vertical mill is a device that grinds lump-like materials to be crushed, such as cement raw materials and coal, into granules or powder. The pulverized powder is then pulverized between a pulverizing roller that rotates following a rotary table, and the pulverized material is blown up above the casing by a rising hot gas flow and classified by a separator, and then the classified fine powder is carried out of the casing. It is configured as follows.

This vertical mill will be explained in more detail with reference to FIG. A circular rotary table 3 is provided which is rotated by a reducer 2 within the casing 1 . An annular groove 4 is formed on the outer periphery of the upper surface of the rotary table 3, and crushing rollers 5 are arranged along the groove 4 at appropriate intervals.

The crushing roller 5 is rotatably supported on a bracket 6, and the bracket 6 is attached to the casing 1 with a pivot 6a.
It is attached so that it can move up and down freely. The bracket 6 is a lowering device 7 provided at the bottom of the casing 1.
The crushing roller 5 is connected to the rod 8 of the rotary table 3, and the crushing roller 5 is brought into pressure contact with the rotary table 3. The lower part of the rotary table 3 and the casing 1 are partitioned by a partition plate 9, and a hot gas outlet 10 is formed between the upper end of the rotary table 3 and the casing 1.

In the above process, the crushed material crushed by the rotary table 3 and the crushing roller 5 flies out of the rotary table 3 due to the centrifugal force of the rotary table 3, and is pushed upward by the rising hot gas jetted from the hot gas spout 10. It blows up. Since the crushing roller 5 and the bracket 6 that rotatably supports the crushing roller 5 are exposed to the hot gas containing the crushed materials, they must be well sealed against the crushed materials.

Normally, the crushing roller 5 and a bracket 6 that rotatably supports the crushing roller 5 are fixed to the bracket 6, as shown in FIG. The roller 5 is rotatably supported, but since the crushing roller 5 rotates and the bracket 6 is fixed, there is a distance d between the crushing roller 5 and the bracket 6.
It is difficult to seal the roller shaft 11, and dust tends to adhere to the roller shaft 11 or enter the bearing 12, which adversely affects its rotation.

The purpose of the present invention is to reliably shield the bearing portion from dust entering between the above-mentioned crushing roller and bracket.

The present invention provides a vertical mill in which grinding rollers are provided on a rotary table at appropriate intervals along the direction of rotation, and the grinding rollers are rotatably supported on a bracket. A seal ring is provided facing the rotary surface, a gap is formed between the seal ring and the rotating surface, and an air blower is provided for supplying air into a chamber surrounded by the inner periphery of the seal ring, the shaft of the crushing roller, the crushing roller, and the bracket. The outlet is formed in a bracket, the chamber from the air outlet to the gap is partitioned into a shaft side chamber and an outlet side chamber by a partition member, and a labyrinth seal is provided in the passage formed by the partition. As a result, air is constantly blown out from the above gap to prevent dust that enters between the crushing roller and the bracket from entering the chamber formed on the inner periphery of the seal ring, and to prevent dust from entering the chamber on the outlet side of the chamber. Even if dust enters the shaft, a labyrinth seal prevents it from entering the shaft side chamber, and the bearing part etc. can be well sealed from dust.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a dust sealing device for a crushing roller bearing according to the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows an overall view of the crushing roller bearing part of the vertical mill shown in FIG.
1 is a roller shaft fixed to and protruding from the bracket 6; 12 is the bracket 6;
This is a bearing for rotatably supporting the crushing roller 5 on a roller shaft 11 protruding from the roller shaft 11.

The crushing roller 5 includes a roller hub 13 that fits around the outer periphery of a bearing 12, and a roller tire 14 provided on the outer periphery of the roller hub 13.

The bracket 6 includes a cylindrical portion 15 to which the roller shaft 11 is fixed, an arm portion 16 that covers the upper outer periphery of the crushing roller 5, and a pivot 6 fixed to the casing 1.
It consists of a shaft hole 17 into which a is fitted.

The roller shaft 11 is fixed at its front end and rear end inside the cylindrical portion 15 by fixing taper rings 18 and 19, respectively. Inside the roller shaft 11 are a shaft hole 20 that supplies lubricating oil to the bearing 12 and a shaft hole 21 that collects the lubricating oil.
is drilled.

Next, the rotating surface 2 on the bracket 6 side of the crushing roller 5
3, the fixed side surface 24 of the bracket 6 facing the rotating surface 23, and the roller shaft 11 therebetween will be explained with reference to FIG.

In the figure, reference numeral 25 denotes an oil seal ring attached to the roller shaft 11 between the bracket 6 and the roller hub 13 of the crushing roller 5, one end of which is in contact with the bracket 6 side, and the other end is in contact with the inner race 26 of the bearing 12.

An oil seal 27 is provided on the outer periphery of the oil seal ring 25 so as to be rotatable along its outer periphery. The oil seal 27 is the roller hub 13
The oil seal 27 is held between a presser piece 29 on the bearing 12 side of the oil seal case 28 and a presser plate 30 attached to the oil seal case 28 on the bracket 6 side. Prevent axial movement.

Reference numeral 31 denotes a seal ring attached to the distal end surface of the cylindrical portion 15 of the bracket 6, which includes a disk portion 32 that extends to the radial outer circumference of the cylindrical portion 15, and a seal ring that extends from the disk portion 32 toward the roller hub 13 and concentrically with the roller shaft 11. It consists of a ring part 33.

A gap 34 is formed between the ring portion 33 and the rotating surface 23 of the roller hub 13.

The bracket 6 is provided with an air outlet 35 for blowing air toward the roller hub 13 along the outer circumferential surface of the seal ring 31, and an inner chamber 36 partitioned by the seal ring 31. Air outlet 37 for supplying air inside
is provided in the cylindrical portion 15.

The air supplied to these air outlets 35 and 37 is supplied to the cylindrical portion 1 from the air supply pipe 38 shown in FIG.
5 and the arm part 16 to the outer air outlet 35, and also through the air passage 40 provided in the cylindrical part 15 to the inner air outlet 37.
supplied to

The inner circumferential chamber 36 partitioned by the seal ring 31 has a partition member 42 composed of an oil seal ring 25, an oil seal 27, an oil seal case 28, and a disk member 41 attached to the oil case 28. Depending on the air outlet 37
A chamber 36 extending from to the gap 34 is partitioned into a shaft side chamber 43 and an outlet side chamber 44.

A labyrinth seal 4 is provided in a passage 45 between the shaft side chamber 43 and the outlet side chamber 44 formed by the partition member 42.
6 is provided. As shown in the figure, the labyrinth seal 46 is formed by labyrinths 47 provided on both sides of the disc member 41, protruding from the disc member 41 and facing the inner periphery of the seal ring 33.

Next, the operation of the present invention will be explained.

During crushing, the roller hub 13, oil seal case 28, and labyrinth seal 46 are on the rotating side, and the bracket 6, seal ring 31, and oil seal ring 25 are on the stationary side.

Air outlets 37 and 3 inside and outside of the seal ring 31
Air is constantly blown out from 5 during crushing, and the air blown out from the outer air outlet 35 blows off dust that accumulates on the outer periphery of the seal ring 31. Air blown from the inner air outlet 37 flows from the shaft side chamber 43 through the labyrinth seal 46 to the outlet side chamber 44, and is further blown out from the gap 34 to the outer periphery of the seal ring 31. Therefore, the dust that tries to enter through this gap 34 is
The air blown out from 4 prevents the intrusion. Furthermore, even if dust enters the seal ring 31 through the gap 34, the seal ring 3
The chamber 36 in the chamber 1 is partitioned into an outlet side chamber 44 and a shaft side chamber 43 by a labyrinth seal 46, so that the chamber 36 only enters the outlet side chamber 44 and does not enter the shaft side chamber 43.

In the embodiment shown in FIG. 3, the seal ring 31
Although it has been shown that the air outlet 35 for blowing out air is provided on the outer periphery of the air outlet, the air outlet 35 does not necessarily need to be provided.

FIG. 4 shows another embodiment of the present invention, in which grease can be supplied to the rotating side of the oil seal 27. In the figure, a grease passage 48 communicating with the rotating side of the oil seal 27 is formed in the oil seal ring 25, and a grease inlet 49 is provided in the passage 48.
Further, a hole 50 for injecting grease is appropriately provided in the circumferential direction of the seal ring 31 facing the grease inlet 49, and a blind screw 51 for sealing is screwed into the hole 50.

As is clear from what has been described in detail above, the present invention exhibits the following excellent effects.

(1) A seal ring is provided on the bracket facing the rotating surface of the crushing roller, a gap is formed between the seal ring and the rotating surface, and air is blown from inside this seal ring through the gap, so that the seal Dust does not enter the shaft side of the ring.

(2) An air outlet is provided in the bracket inside the seal ring, and the chamber from this air outlet to the above-mentioned gap is divided into an axis side chamber and an outlet side chamber by a labyrinth seal. Therefore, even if dust enters the outlet side chamber through the gap, the dust will not enter the axis side chamber.

(3) The roller shaft can be effectively sealed from dust.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional front view of a vertical mill, Fig. 2 is a sectional view showing the entire crushing roller bearing according to the present invention, and Fig. 3 is a dust sealing device for the crushing roller bearing according to the present invention. FIG. 4 is a cross-sectional view of a main part showing another embodiment of a dust seal device for a crushing roller bearing according to the present invention. In the figure, 3 is a rotary table, 5 is a crushing roller,
6 is a bracket, 11 is a roller shaft, 23 is a rotating surface, 31 is a seal ring, 34 is a gap, 37 is an air outlet, 42 is a partition member, and 46 is a labyrinth seal.

Claims (1)

[Scope of utility model registration request] In a vertical mill in which grinding rollers are provided on a rotary table at appropriate intervals along the rotation direction, and the grinding rollers are rotatably supported on a bracket, a seal is attached to the bracket toward the rotating surface of the grinding roller. A ring is provided, a gap is formed between the seal ring and the rotating surface, and an air outlet is provided in the bracket for supplying air into a chamber surrounded by the inner periphery of the seal ring, the shaft of the crushing roller, the crushing roller, and the bracket. A dust sealing device for a crushing roller bearing, characterized in that the chamber from the air outlet to the gap is partitioned by a partition member, and a labyrinth seal is provided in the passage formed by the partition.