JPH0121005Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an airtight rock removal box for a pressurized mill, which is configured so that airtightness can be adjusted without stopping the operation of the mill.

The general configuration of a conventional pressurized mill is shown in FIG. This mill is a mill called a roller mill, and has a rotary table 2 at the base of a casing 1, and a plurality of rollers 3 on the rotary table 2.
are in contact with each other via a wear-resistant material 4 provided on the rotary table 2.

The roller 3 is rotatably supported on a rotating shaft 5, and the rotating shaft 5 is rotatably supported on an arm 6 that is swingably supported via a shaft 7.

A chute 9 is disposed vertically in the center of a cylinder 8 that is continuously joined to the casing 1, and a rotating cylinder 10 is rotatably fitted to the outside of the cylinder 9. There is. A plurality of blades 11 are attached to the lower end of this rotary cylinder 10. The rotating cylinder 10 is supported by a bearing 12.

A pulley 13 provided at the upper end of the rotating cylinder 10 and a pulley 15 fixed to the output shaft 14a of the motor 14.
A belt 16 is stretched between the two and transmits the rotation of the motor 14 to the rotating cylinder 10.

The unpulverized material fed into the mill having such a structure is sandwiched between the rotary table 2 and the rollers 3 and is pulverized.

The crushed particulates are then guided outward through the outlet gas duct.

On the other hand, unpulverized materials or foreign materials such as iron pieces that have not been crushed into fine particles and have fallen from the rotary table 4 are guided to a stone waste box 17 provided at the lower end of the mill.

The detailed structure of this rock removal box 17 is shown in FIG. 2.
The stone waste box 17 is provided with a connecting cylinder 18 in its upper part that is continuous with the casing of the mill. An airtight sealing device 19 is provided between the connecting tube 18 and the stone removal box 17.

This hermetic sealing device 19 is provided with a slide plate 20 for sealing between the connecting cylinder 18 and the stone removal box 17.

The slide plate 20 is slidably attached along a guide groove 21 provided across the upper end of the rock removal box 17, and is connected to the tip of the rod 23 of the cylinder 22.

Further, above the guide groove 21, a slide plate 20 is provided.
A labyrinth seal 24 is provided for hermetically sealing.

Further, the slide plate 20 rides on the lower side of the guide groove 21 near its tip, and a roller 25 is provided to improve sealing performance.

On the other hand, a lid 26 is provided on the discharge port side of the stone discharging box 17 so as to be openable and closable, and is closed except when discharging stones. In the vicinity of the lid 26 of the rock removal box 17, a rocking plate 27 is rotatably supported at its upper end via a shaft 28. Therefore, it is rotated as shown by the two-dot chain line in FIG. 2, and the amount of stone waste in the stone waste box 17 is detected.

29 and 30 are limit switches that detect the stroke of the rod 23.

By the way, since the pressure inside the casing 1 of the mill mentioned above is higher than the outside pressure, during the operation of the mill, the lid 26 of the rock removal box 17 is completely closed and the slide plate 20 is opened to remove the unpulverized material from the stone waste. It is designed so that it can fall freely to the box 17 side.

In this state, when a predetermined amount of unpulverized material accumulates in the stone waste box 17, this is detected by the rotation of the rocking plate 27, and a state is reached in which the material to be crushed must be removed from the stone waste box 17.

At this time, the cylinder 22 is actuated to advance the slide plate 20 so that its tip rests on the roller 25. In this state, slide plate 2
0 rides on the roller 25, the slide plate 2
0 is in close contact with the labyrinth seal 24 and is tightly isolated from the inside of the connecting cylinder 18. Therefore, it is hermetically sealed from the casing 1 side.

In this state, the lid 26 is opened and the objects to be crushed in the stone waste box 17 are taken out.

On the other hand, if the airtight sealing device 19 as described above is used for a long time, the labyrinth seal 24 will be worn out due to the sliding of the slide plate 20, and airtight sealing will no longer be possible.

In such a case, the labyrinth seal 24 must be replaced, but the mill casing 1
There is only one airtight sealing device 19 between the side and the stone waste box 17, and the operation of the mill must be stopped when replacing it.

If the operation of the mill is stopped just to replace the labyrinth seal, there will be a loss in operating time, for example, in the case of a boiler, the result will be extremely large, such as the stoppage of power generation.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and is an airtight discharge stone for a pressurized mill configured so that the sealing state can be adjusted without stopping the operation of the mill. The purpose is to provide a box.

In order to achieve the above object, the present invention uses an eccentric roller as the roller that receives the slide plate. This eccentric roller can be operated from outside the rock removal box during operation, and the contact state between the slide plate and the labyrinth seal can be controlled. Adopted a configuration that allows adjustment of the

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

3 and 4 illustrate an embodiment of the present invention. In each figure, parts that are the same as or correspond to those in FIG. 2 are given the same reference numerals, and their explanations will be omitted.

In this embodiment, four roller receivers 31 are provided on the lower side of the slide plate 20 in the front and rear, left and right directions, and the roller receivers 31 are wedge-shaped. Then, the rollers 32 that these roller receivers 31 ride on are moved to the fourth roller.
As shown in the enlarged figure, an eccentric roller was used.

This eccentric roller 32 may be configured as a circular roller, but may also be configured as an oval roller.

Then, the roller shaft 33 is guided outward through the side wall 17a of the rock removal box 17 via the gland seal 34, and its tip 33a is made into a square shaft, and the rock removal box 17
It can now be rotated from the outside.

Since this embodiment is configured as described above,
In the initial stage of use of the hermetic sealing device, the circumferential surface of the short diameter side of the eccentric roller 32 is adjusted so as to come into contact with the roller receiver 31 of the slide plate 20, and the device is continued to be used for a predetermined period of time. When the labyrinth seal 24 wears out and the airtightness deteriorates, the roller shaft 33
The one end 33a is turned using a handle (not shown) or the like to adjust the circumferential surface of the eccentric roller 32 on the longer diameter side to come into contact with the roller receiver 31.

The amount of adjustment is determined depending on the amount of wear on the labyrinth seal 24.

Thereafter, whenever the labyrinth seal 24 wears out and the airtightness deteriorates, the same operation may be repeated to adjust the airtightness.

The adjustment margin for airtightness is determined by the eccentricity e of the eccentric roller 32.

In this way, within the range that can be adjusted by the eccentricity e of the eccentric roller 32, the loss of airtightness due to wear of the labyrinth seal 24 can be recovered.

Then, only when the labyrinth seal is worn to such an extent that it cannot be adjusted by the eccentricity e, it is sufficient to stop the operation of the mill and replace the labyrinth seal.

As is clear from the above explanation, according to the present invention, the roller that comes into contact with the roller holder of the slide plate is configured as an eccentric roller that can be operated from the outside. can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a pressurized mill equipped with an airtight rock removal box of the present invention, Fig. 2 is a longitudinal cross-sectional view of a conventional airtight rock removal box, and Figure 3 is an airtight stone removal box of the present invention. FIG. 4 is a cross-sectional view of the main part of the box, and a vertical cross-sectional view showing the state in which the eccentric roller is attached to the airtight rock removal box. 1 is the mill casing, 2 is the rotary table, 3
is a roller, 4 is a wear-resistant material, 5 is a rotating shaft, 6 is an arm, 7 is a shaft, 8 is a cylinder, 9 is a cylinder, 10 is a rotating cylinder, 11 is a blade, 12 is a bearing, 13 is a pulley, 14 is a motor , 14a is the output shaft of the motor, 1
5 is a pulley, 16 is a belt, 17 is a rock removal box, 18
19 is a connecting cylinder, 19 is an airtight sealing device, 20 is a slide plate, 21 is a guide groove, 22 is a cylinder, 23 is a rod of the cylinder, 24 is a labyrinth seal, 25 is a roller, 26 is a lid of a rock removal box, 27 is a Rocking plate, 28
is the axis of the rocking plate, 29 and 30 are the limit switches,
31 is a roller receiver, 32 is an eccentric roller, 33 is a roller shaft, 33a is a tip of the roller shaft, and 34 is a gland seal.

Claims (1)

[Scope of utility model registration request] Provided in communication with the casing of the pressurized mill,
In the airtight stone removal box of a pressurized mill, in which the space between the slide plate and the casing is airtightly sealed by a slide plate that can be opened and closed, a roller receiver is provided on the back of the slide plate, and the eccentric rollers that come into contact with the roller receiver are removed. This is an airtight rock removal box for pressurized mills that can be operated from the outside of the stone box to prevent airtightness from deteriorating over time.