JPH09122515A - Cage mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pulverized material from being deposited and stuck on the inner surfaces of sidewalls of a casing and staying there. SOLUTION: In a cage mill where rotors 10, 20 in which plural pins 11, 21 arranged on concentric circles' of different diameters are provided projectingly toward the other side plate on two side plates 12, 22 opposite to each other subjected to rotary driving in the opposite direction to each other by drive shafts 1, 2 are housed in a casing 3 opened downwards, blades 15, 25 for a centrifugal fan are provided projectingly on the outside surfaces of the side plates 12, 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage mill for crushing various materials by applying an impact force with a pin of a cage-shaped rotor.

[0002]

2. Description of the Related Art A molten material obtained by melting municipal solid waste and incinerated ash of industrial waste in a waste melting furnace is injected into a granulating and solidifying apparatus provided below a discharge port of the melting furnace. Then, it is separated into magnetic granulated metal and non-magnetic granulated slag by a magnetic separator and reused. Among them, the granulated slag contains a large amount of sharp needle-shaped materials having irregular sizes and shapes, and is generally put into a cage mill and pulverized. As this cage mill, generally, as shown in FIG. 4, two side plates 12 and 22 facing each other, which are rotationally driven in opposite directions by drive shafts 1 and 2, are provided concentrically with different diameters toward the other side plate. A casing 60 in which the rotors 51 and 52 with the pins 11 and 21 protruding are opened downward.
The object to be crushed, which is housed in the chute 8 and supplied from the chute 8 through the impeller 9 for feeding, is supplied to each pin 1 of the rotors 51 and 52.
A structure in which the particles are crushed by alternately colliding with each other is used.

However, since the above-mentioned water granulated slag contains water, when the water granulated slag having a water content of 5% or more is pulverized by the cage mill 65 having the above structure, as shown by the cross hatched portion 70 in FIG. , A fine slag piles up and adheres to the inner surface of the casing 60 accommodating the rotors 51 and 52, which causes wear of the side plates and pins of the rotor, and when the operation is continued, the frictional force becomes excessive and the rotor drive Leading to a motor trip accident.
In particular, the side wall 6 of the casing 60 facing the side plate of the rotor
The slag deposited and fixed on the inner surface portions of the Nos. 1 and 62 contact the side plates of the rotor over a wide area, which is a major cause of wear of the side plates and the trip accident.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides an cage mill capable of preventing crushed substances from accumulating and sticking to the inner surface of the side wall of a casing. .

[0005]

In the cage mill of the present invention, a plurality of pins arranged on concentric circles having different diameters are provided on two side plates facing each other which are rotationally driven in opposite directions by a drive shaft. In a cage mill in which a rotor protruding toward the inside is housed in a casing that opens downward, blades for a centrifugal fan are protruded from an outer surface of the side plate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals. Referring to FIG.
Is mounted on the disk-shaped side plate 12 mounted on the drive shaft 1 by connecting the bases of a plurality of pins 11 arranged side by side on a double concentric circle, and the tip end of each pin 11 is connected by annular connecting rings 13 and 14. It will be done.

On the outer surface of the side plate 12 (on the side wall 4 side of the casing 3), three centrifugal fan blades 15 are provided so as to project. As shown in FIG. 2, the blades 15 are rearward-facing blades whose outer diameter side is inclined in a direction opposite to the rotation direction of the rotor (direction of arrow X), and are generally curved plate-shaped blades for turbofans. And made into a flat plate,
Counterbore hole 16 for pin attachment formed on the outer surface of the side plate 12.
And is fixed to the outer surface by welding. 1
Reference numeral 1a is a base shaft portion of the pin 11, and 17 is a nut for tightening the shaft portion. Further, reference numeral 18 is an attachment for attaching the side plate 12 to the drive shaft 1.

In the rotor 20, the bases of a plurality of pins 21 arranged in parallel on a double concentric circle having a diameter smaller than that of the rotor 10 are attached to a side plate 22 made of an annular plate, and the pins 21 on the outer diameter side are attached. The tip end portion is connected by an annular connecting ring 23, and the tip end portion of the pin row on the inner diameter side is connected to the flange portion 24a of the fixture 24 attached to the drive shaft 2, and the side plate 22 is driven through the pin row. It is supported on the shaft 2.

On the outer surface of the side plate 22 (on the side wall 5 side of the casing 3), three blades 25 for a centrifugal fan are projected. As shown in FIG. 3, this blade 25 is also a flat plate-shaped rearward blade inclined rearward with respect to the rotation direction of the rotor 20 (direction of arrow Y) like the blade 15, and is formed on the outer surface of the side plate 22. Counterbore 2 for mounting pin 21
6 is avoided and fixed to the outer side surface by welding. Reference numeral 27 is a mounting hole for inserting the base end shaft portion of the pin 21.

On the other hand, in this example, the casing 3 has a rectangular (box-shaped) shape that opens downward, and a flat top plate 6 is attached to the top of a rectangular tubular main body. A bearing for supporting the drive shafts 1 and 2 and a motor for rotational drive are mounted on the base 7 for supporting the casing 3, but these are known and are not shown. Further, the drive shaft 1 penetrating portion of the side wall 4 of the casing 3 and the drive shaft 2 penetrating portion of the side wall 8a of the chute 8 communicating with the inside of the casing 3 have a known seal structure in which seal rings 31 and 32 made of felt are attached. However, there are clearances 33 and 34 of several mm on each side between these seal rings and the drive shaft.

In the cage mill 40 having the above structure, when the drive shafts 1 and 2 are rotationally driven in the opposite directions, the air outside the side plate 12 is driven by the blades 15 by the rotation of the side plate 12 of the rotor 10 in the arrow X direction. An air flow indicated by an arrow Q is formed by a centrifugal force that flows toward the outer diameter side of the rotor, flows in from the clearance 33 of the seal portion of the drive shaft 1 and flows between the side plate 12 and the side wall 4 in the outer diameter direction of the rotor. Similarly, when the side plate 22 of the rotor 20 rotates in the direction of the arrow Y, the air outside the side plate 22 is driven by the blades 25 and flows toward the rotor outer diameter side by the centrifugal force, and from the clearance 34 of the seal portion of the drive shaft 2. An airflow indicated by an arrow R that flows in between the side plate 22 and the side wall 5 and flows in the outer diameter direction of the rotor is formed. Then, these air flows Q and R are discharged to the outside of the casing from the downward opening of the casing 3.

Therefore, fine slag powder generated by impact crushing by the rotors 10 and 20 of the water granulated slag charged from the chute 8 into the casing 3 is generated by the side plate 1 of the rotor.
Clearance 1 between 2, 22 and casing side walls 4, 5
Even if they try to enter the inside of each of the blades 9 and 29,
The air flows Q and R by the air currents 5 and 25 are blown away in the outer diameter direction of the rotor, and the deposition and fixation (occupied) of the slag powder in the clearances 19 and 29 are prevented.

The present invention is not limited to the above specific example. For example, in the above example, since the casing 3 is a square casing having a flat top plate, the slag powder is not generated when the top plate has a semi-cylindrical shape. In contrast to the bridge-shaped fixed layer that is uniformly pressed and does not easily peel off, even if slag powder adheres because the top plate 6 is a flat plate, it only reaches a flat plate having a non-uniform thickness. The present invention has an advantage that it is easily separated from the flat plate portion and easily falls, but the present invention is also applicable to the case where the top plate has a semi-cylindrical shape. In addition, a casing structure may be adopted in which a soft material such as a soft rubber sheet is attached to the inner surface of the casing, and the slag powder is separated from the soft material portion by vibrating if it adheres. .

As the blades for the centrifugal fan, in addition to the above-mentioned blades for the turbo fan, blades for a multi-blade fan or a radial fan may be used. Further, as the suction ports for the suction air supplied to these vanes, the clearances 33, 34 of the rotary shaft seals are used, and the inner side of the side walls 4, 5 of the casing from the vanes 15, 25 is used. Alternatively, an intake hole having an appropriate shape may be bored and used. The present invention can also be applied to cage mills for uses other than crushing granulated slag.

[0015]

As described above, according to the present invention,
Due to the blowing action of the centrifugal fan blades protruding from the outer surface of the side plate of the rotor, the crushed material crushed by the rotor is prevented from entering between the side plate of the rotor and the side wall of the casing. It is possible to prevent the occurrence of an occupancy in which crushed substances are accumulated and fixed on the surface portion, and the abrasion of the side plate of the rotor and the trip accident due to the occupancy.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a cage mill showing a specific example of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is the outside of the side plate 22 alone in FIG. 1 (side wall 5 side).
It is the side view seen from.

FIG. 4 is a longitudinal sectional view of an essential part showing an example of a conventional cage mill.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 2 ... Drive shaft, 3 ... Casing, 10 ... Rotor, 11 ... Pin, 12 ... Side plate, 15 ... Blade, 20 ... Rotor, 21 ... Pin, 22 ... Side plate, 25 ... Blade, 40 ... Cage mill.

Claims (1)

[Claims] 1. A rotor having two side plates facing each other, which are rotationally driven in opposite directions by a drive shaft, provided with a plurality of pins arranged on concentric circles of different diameters and projecting toward the other side plate. A cage mill that is housed in a casing that is open to the outside, wherein blades for a centrifugal fan are provided so as to project from the outer surface of the side plate.