JP2002159873A - Cage-type crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the use life of a ceramic pin in a cage-type crusher. SOLUTION: A cage member 12 is constructed by forming a penetration hole 5 through both the ends of a ceramic pin 10 and four to eight key groves 17 with the same distances between them at both the ends of the penetration hole 5; setting the phase difference between the key grooves 17 at the one end and the key grooves 17 at the other end at 30-60 deg.; inserting a metal shaft 4 having female screw parts 18 at both ends key grooves 16 through at least one end; putting a key 20 into a space formed by the key grooves 16 of the metal shaft 4 and the key grooves 17 of the ceramic pin 10, thus fixing the ceramic pin 10 to the metal shaft 4; inserting bolts 23 into bolt holes 25, 26 of a rotary disk 6 and a band 8 arranged at both the sides of the ceramic pin 10; and fitting the male screw part 19 of the bolts 23 to the female screw parts 18 of the metal shaft 4 to cause the ceramic pin 10 to be held between the rotary disk 6 and the band 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for crushing small objects such as rocks, gravel, or natural or artificial ore against ceramic pins of a plurality of cage members rotating in a casing. The present invention relates to a cage-type pulverizing device used for the above.

[0002]

2. Description of the Related Art Conventionally, in order to pulverize hard objects to be crushed such as rocks, gravel, or natural or artificial ores, a plurality of cage members composed of ceramic pins are arranged concentrically. A cage type pulverizing apparatus has been used which pulverizes an object to be pulverized by colliding with a rotated ceramic pin of each cage member.

As shown in FIG. 4, for example, a cage type pulverizing apparatus of this kind includes an input port 130 and an output port 13 for an object to be pulverized.
1 and a casing 102 in which a protective liner 103 is laid on an inner wall surface 102a.
Large-diameter cage member 11 in which a plurality of ceramic pins 110 are held at equal intervals between the ring-shaped band 06 and a ring-shaped band 108.
2, a disk-shaped rotating disk 107 and a ring-shaped band 10
9 and a small-diameter cage member 113 in which a plurality of ceramic pins 111 are sandwiched at equal intervals, are arranged concentrically, and a rotating disk 10 of each cage member 112, 113 is provided.
In some cases, a drive shaft 121 of a motor (not shown) is connected to rotating shafts 114 and 115 provided in the motors 6 and 107.

[0004] The pulverization of the object to be pulverized by the cage type pulverizer 101 is performed by using a motor.
2 and 113 are relatively rotated, and the casing 10
When the object to be crushed is supplied from the second inlet 130, the object to be crushed first collides with the ceramic pins 111 constituting the small-diameter cage member 113 and is crushed. -Ceramic pin 110 constituting the member 112
And crushed into particles having a predetermined size by colliding with the protective liner 103 in the casing 102. The crushed particles are discharged from the outlet 131 of the casing 102. Had to be taken out.

Although the ceramic pins 110 and 111 of each of the cage members 112 and 113 are excellent in wear resistance, they wear or break due to collision with a material to be ground during long-term use. Only the ceramic pins 110 and 111 can be replaced.

For example, FIG. 5 shows a large-diameter cage member 112.
The ceramic pin 110 has a through hole 105 penetrating both ends, and the metal shaft 104 having the male screw portion 127 at both ends is inserted into the through hole 105 as shown in FIG. At the same time, the rotating disk 106 is provided on one end side of the ceramic pin 110 via a ring-shaped spacer 124 and an elastic member 122.
On the other end side, a ring-shaped spacer 124 and an elastic body 12 are provided.
2, the band 108 is disposed via the rotating disk 106 and the band 1
08 is screwed into each of the screw holes 125 and 126, and the nut 128 is screwed into the male screw portion 127 of the metal shaft 104 so that the ceramic pin 110 is sandwiched and fixed between the rotating disk 106 and the band 108. (See Japanese Patent Publication No. 4-32702).

FIG. 6 shows another mounting structure of one ceramic pin 110 constituting the large-diameter cage member 112. As shown in FIG. And a through hole 105 provided with a key groove 117.
18 and the metal shaft 104 having a key groove 116 at one end is inserted therethrough.
The ceramic pin 110 is fixed to the metal shaft 104 by engaging the key 120 with a space formed by the key groove 116 and the key groove 116 of the metal shaft 104, and a ring-shaped spacer is provided on one end side of the ceramic pin 110. 124 and elastic member 1
22 and a band 108 on the other end side via a ring-shaped spacer 124 and an elastic member 122, respectively, and the screw holes 125 and 126 provided in the rotating disk 106 and the band 108 are provided. The female screw 122 of the bolt 123 inserted into the female screw portion 1 of the metal shaft 104
By screwing the ceramic pin 110 into the pin 18, the ceramic pin 110 is sandwiched and fixed between the rotating disk 106 and the band 108.

In the mounting structure shown in FIG. 6, the elastic member 122 functions to position the ceramic pin 110 in the longitudinal direction and prevent the key 120 from coming off.
4 has a female screw 118 formed at one end thereof.
By setting a, the bolt 123 at the other end is not loosened when the bolt 123 is tightened (see JP-A-09-10610).

Although FIGS. 5 and 6 show the mounting structure of the ceramic pins forming the large diameter cage member 112, the ceramic pins 111 forming the small diameter cage member 113 are also fixed by the same mounting structure. Was.

[0010]

Incidentally, the upper and lower surfaces of the band 108 side of the ceramic pins 110 of the cage members 112 and 113 were severely abraded due to collision with the material to be ground.

For this reason, in the cage member 112 having the mounting structure shown in FIG. 5, the nut 128 is loosened and the ceramic pin 110 is rotated so that the almost worn portion on the band 108 side is positioned up and down. After that, the nut 128 is tightened and fixed, and one ceramic pin 1 is fixed.
Although it has been used for as long as possible, it is necessary to remove the cage member 112 from the casing 102 in order to perform this operation. The work was very large because it was necessary.

The assembly of the cage member 112 is difficult unless a skilled technician is involved, and even a skilled person positions the unworn portion of the ceramic pin 110 at a predetermined position where it is easily worn. This requires a great deal of labor and time, so that the cage-type pulverizer has to be stopped for half a day to one day, resulting in very poor operation efficiency.

On the other hand, in the cage member 112 having the mounting structure shown in FIG.
And the key 120 are engaged and fixed, so that it is relatively easy for non-skilled technicians to position the unworn portion of the ceramic pin 110 up and down on the easily worn band 108 side. Although the assembly time can be shortened as compared with the mounting structure of FIG. 5, the number of key grooves 107 that can be formed on one side of the ceramic pin 110 is limited. Even if the ceramic pin 110 is rotated, the outer circumference of the band 108 cannot be worn uniformly, and the outer circumference of the rotating disk 106 with relatively little wear can still be used. Since only one side of the ceramic pin 110 is used, the direction of the ceramic pin 110 cannot be changed and used.
There was a problem that 0 wasted.

[0014]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a plurality of cage members having different diameters, each having a plurality of ceramic pins sandwiched between a disk-shaped rotating disk and a ring-shaped band in a casing. Are arranged concentrically, by feeding the object to be crushed while rotating each of the upper cage members, in a cage-type crusher that crushes the object to be crushed by collision with the ceramic pins, the ceramic pins include: A through hole penetrating both ends, and 4
８8 key grooves are provided at equal intervals, and the phase difference between the key grooves formed on one end side and the key grooves formed on the other end side is 30〜6.
0 °, a metal shaft having a female thread at both ends and a key groove at at least one end side is inserted through the through hole, and is constituted by a key groove of the metal shaft and a key groove of the ceramic pin. A key is engaged in the space to be fixed to fix the ceramic pin and the metal shaft, and a bolt is inserted into each screw hole of the rotating disk and the band respectively arranged on both sides of the ceramic pin, and The cage member is formed by screwing the male screw portion to the female screw portion of the metal shaft, thereby sandwiching the ceramic pin between the rotating disk and the band.

[0015] Preferably, both edge portions of the ceramic pin are curved surfaces having a radius of curvature of 3 to 5 mm.

[0016]

Embodiments of the present invention will be described below. FIG. 1 is a schematic sectional view showing a cage type crusher of the present invention.

The cage-type crushing apparatus 1 has a disk-shaped rotating machine in a casing 2 having an inlet 30 and an outlet 31 for the material to be crushed and having a protective liner 3 laid on an inner wall surface 2a. A large-diameter cage member 12 in which a plurality of ceramic pins 10 are sandwiched between the disk 6 and a ring-shaped band 8 at equal intervals, and a disk-shaped rotating disk 7 and a ring-shaped band 9. A small-diameter cage member 13 having a plurality of ceramic pins 11 interposed therebetween at equal intervals is arranged concentrically, and rotating shafts 14 and 15 provided on rotating disks 6 and 7 of the cage members 12 and 13 are provided. It is connected to a drive shaft 21 of a motor (not shown).

Next, the mounting structure of the ceramic pins 10 and 11 forming the cage members 12 and 13 will be described. Since the cage members 12 and 13 have the same structure except for the diameter, the mounting structure of the ceramic pins 10 provided in the large-diameter cage member 12 will be described in detail.

FIG. 2 is a partially cutaway sectional view showing a mounting structure of one ceramic pin 10 constituting the cage member 12 in FIG. 1, and FIG. 3 is a sectional view taken along line XX of FIG. It is.

As shown in FIGS. 2 and 3, inside the ceramic pin 10, a plurality of key grooves 17 are provided at both ends.
Are provided at equal intervals, and the through-hole 5 is provided with a female threaded portion 18 at both ends and a metal shaft 4 provided with at least one keyway 16 at one end. In the space formed by the key groove 17 of the ceramic pin 10 and the key groove 16 of the metal shaft 4, ceramic, metal, hard rubber,
Key 2 made of either plastic or resin
The ceramic pin 10 is fixed to the metal shaft 4 by engaging 0.

The length of the metal shaft 4 is the length of the ceramic pin 1.
0, and a ring-shaped spacer 24 and an elastic member 22 are provided at both ends of the ceramic pin 10.
The rotating disk 6 and the band 8 are respectively arranged through the holes, and the screw holes 25, 2 provided in the rotating disk 6 and the band 8, respectively.
6 and the male screw 19 of the bolt 23
By screwing into the female screw portion 18 of the metal shaft 4, the ceramic pin 10 is sandwiched between the rotating disk 6 and the band 8 to form the cage member 12.

In this mounting structure, the elastic member 2
2 is a key 2 for positioning the ceramic pin 10 in the longitudinal direction.
0 to prevent the metal shaft 4 from coming off.
The female screw portion 18 at one end is reverse-threaded so that the bolt 23 at the other end is not loosened when the bolt 23 is tightened.

Next, the principle of crushing an object to be crushed by the cage type crusher 1 will be described.

First, when each of the cage members 12 and 13 is relatively rotated by a motor (not shown) and an object to be pulverized is input from the input port 30 of the casing 2, the object to be pulverized firstly. Then, it crushes by colliding with the ceramic pin 11 constituting the small-diameter cage member 13 and then crushes by colliding with the ceramic pin 10 constituting the large-diameter cage member 12 rotating in the reverse direction. The crushed particles collide with the protective liner 3 in the casing 2 and can be crushed into particles having a predetermined size. The crushed particles are taken out from the outlet 31 of the casing 2. ing.

The ceramic pins 10 and 11 constituting each of the cage members 12 and 13 are worn by the collision with the material to be crushed, and particularly the upper and lower surfaces of the bands 8 and 9 are severely worn. The ceramic pins 10 and 11 are turned so that the portions that are hardly worn are positioned on the upper and lower surfaces of the bands 8 and 9. According to the present invention, the through holes 5 of the ceramic pins 10 and 11 are adjusted. A plurality of key grooves 17 are arranged at equal intervals at the end, and the ceramic pins 10 and 11 are rotated in accordance with the key grooves 17 so that the key 20 is engaged with a space formed by the key grooves 16 of the metal shaft 4. The ceramic pins 10 and 11 can be easily adjusted because they can be positioned with respect to the metal shaft 4. In addition, the key grooves 17 are provided not only on one end side of the ceramic pins 10 and 11 but also on both ends, and the phases thereof are different, so that the outer circumferences of the ceramic pins 10 and 11 on the bands 8 and 9 are substantially even. Since it can be used until it is worn and the directions of the ceramic pins 10 and 11 can be switched, the rotating disks 6 and 7 which have not been considered so far can also be used, and one ceramic pin 10 and 11 can be used. The use efficiency of the pin 11 can be increased, a cage-type pulverizer that does not require replacement of the ceramic pins 10 and 11 for a long period can be provided, and the maintenance cost can be reduced.

By the way, to achieve such an effect,
It is preferable that the number of through holes 5 and the number of key grooves 17 formed at both ends of the ceramic pins 10 and 11 be 4 to 8. If the number of the key grooves 17 is less than three, the setting of the rotation angle of the ceramic pins 10 and 11 is reduced, so that the portion with little wear cannot be effectively fitted to the upper and lower surfaces of the bands 8 and 9. Because the outer circumferences of the bands 8 and 9 cannot be worn almost uniformly.
Conversely, if the number of the key grooves 17 exceeds eight, the thickness of the partition between the adjacent key grooves 17 becomes too thin.
This is because rattling of 1 occurs and adversely affects the pulverizing performance.

The key grooves 17 formed at both ends of the ceramic pins 10 and 11 are formed at 30 to 60 °, preferably 4 °.
It is preferable to arrange them with a phase difference P of 5 °.

If the phase difference is less than 30 ° or more than 60 °, the number of the key grooves 17 formed on one side of the ceramic pins 10 and 11 is 4 to 8, so that the key on the opposite side is formed. This is because the effect of overlapping the groove 17 and shifting the phase is small, so that the outer peripheries of the bands 8 and 9 cannot be worn almost uniformly.

Further, the outer peripheral edge portions of the ceramic pins 10 and 11 have a curved surface 10a having a radius of curvature R of 3 to 5 mm.
It is preferable that

The reason for this is that the rotating disks 6, 7 and the band 8,
The ceramic pins 10, 11 sandwiched between the pins 9 and 11 generate stress in the direction in which the rotating discs 6 and 7 rotate when crushing, whereas the bands 8 and 9 stop rotating. Is generated in the direction of the cage member 12,
13 is distorted, and the ceramic pins 10, 11 which are supposed to be in vertical contact are tilted.
The outer peripheral edge portion 1 hits the bands 8, 9 and the protective liner 3 attached to the rotating disks 6, 7 and the like, causing chipping or cracking. The chipping or cracking causes uneven wear, and in the worst case, the ceramic pin 10 , 11 is broken. Specifically, when the radius of curvature R of the outer peripheral edge portion of the ceramic pins 10, 11 is less than 3 mm, the curved surface 10a
The effect is small, and the outer peripheral edges of the ceramic pins 10 and 11 come into contact with the bands 8 and 9 and the protective liner 3 attached to the rotating disks 6 and 7 to cause chipping or cracking, and conversely, the radius of curvature R is 5 mm. Is exceeded, the radius of curvature R of the outer peripheral edge portion becomes too large, so that a gap is formed between the protective liner 3 and the material to be ground enters from there, and wear proceeds.

As described above, by using the mounting structure of the ceramic pins 10 and 11 shown in FIGS. 1 to 3, the unworn portions on the outer periphery of the bands 8 and 9 are set on the upper and lower surfaces where the wear is severe. And ceramic pins 10, 1
1 can be used until the outer periphery of both ends is uniformly worn, so that its service life can be improved to 1.5 times or more of the conventional one and the maintenance cost can be reduced.

Incidentally, the ceramic pins 10 and 11 forming the cage members 12 and 13 need to be formed of a material having a strength enough to withstand an impact with an object to be pulverized. Ceramics such as alumina-titanium carbide ceramics, zirconia ceramics, silicon carbide ceramics, and silicon nitride ceramics can be used.

Among them, especially Vickers hardness 14G
Silicon nitride ceramics having a high wear resistance and having a Pa of at least Pa, a fracture toughness (K1C) of at least 6.0 MPa @ m, and a strength of at least 800 MPa are preferred.

As such a silicon nitride ceramic, a ceramic mainly composed of a β-silicon nitride crystal phase and containing a grain boundary phase composed of Y and / or a rare earth element, silicon, aluminum, and oxygen is preferable. 75% silicon nitride
95% by weight, 1 to 10% by weight of Y and / or rare earth element in terms of oxide, and aluminum in 0.0% in terms of oxide.
1 to 5% by weight, containing 10% by weight or less of impurity oxygen in terms of silicon oxide, having a density of 3.2 g / cm ³ or more, a porosity of 3% or less, an average void diameter of 5 μm or less, and It is preferable that the void having a void diameter of 5 to 30 μm is 30% or less, and the void having a void diameter of 30 μm or more is 5% or less.

In order to produce such a silicon nitride-based ceramic, silicon nitride powder, particularly a powder having an α-rate of 90% or more, is used as a silicon nitride raw material, or an amount equivalent to 0 to 80% by weight of the silicon nitride raw material. the replaced silicon powder, and easily generate a α-Si ₃ N ₄ by nitriding silicon powder at low temperature, increasing the content of α-Si ₃ N ₄ of the molded body after nitriding.

By firing such a molded article having a large content of α-Si ₃ N ₄ , the generation of acicular β-silicon nitride crystal phase can be increased, and the strength and toughness of the ceramic can be increased. Can be. Then, Y and / or a rare earth element oxide powder, an aluminum oxide powder, and a silicon oxide powder are added to the silicon nitride raw material, and if necessary, at least Mg, W, Mo, Mn, Cu, and Fe. A mixed powder obtained by adding one kind of oxide, nitride, oxynitride or silicide powder is granulated to a size of 30 to 300 μm by mesh pass granulation, spray granulation, dry granulation or the like. After the body is formed, it is formed into a desired shape by a known molding method, for example, press molding, casting, cold isostatic pressing, or the like.

Thereafter, the molded body was placed between 1650 and 195
In a nitrogen atmosphere at 0 ° C., the density of the sintered body may be increased by a known firing method under the condition that the sintered body density becomes 3.20 / cm ³ or more.

Although the embodiment of the present invention has been described above, the present invention is not limited to the structure shown in this embodiment, and it goes without saying that improvements and modifications can be made without departing from the spirit of the present invention. .

[0039]

EXAMPLES (Experimental Example 1) Here, an experiment was conducted for examining the degree of wear of ceramic pins when the cage-type pulverizer 1 of the present invention and the conventional cage-type pulverizer 101 were used.

The cage members 12 and 13 provided in the cage-type crushing apparatus 1 of the present invention use the mounting structure shown in FIG. 1 and the number of key grooves 17 formed on both sides of the ceramic pins 10 and 11 is four. And the phase difference P between the key grooves 17 on both sides.
Used were different from each other at 35 °, 45 °, and 55 °.

The cage members 112 and 113 provided in the conventional cage-type crusher 101 use the mounting structure shown in FIG. 6, and the number of the key grooves 117 formed at the ends of the ceramic pins 110 and 111 is four. did.

Further, as the cage type pulverizing device of the comparative example, one of the mounting structures shown in FIG.
The number of key grooves 17 formed at the end of 11 was four.

Each of the ceramic pins 10, 1
The dimensions of 1, 110 and 111 are 95 mm in diameter and 34 in length.
Each cage member 112, 113 was provided with three ceramic pins 10, 11, 110, 111, respectively.

The cage type pulverizers 1, 1
01, crush the gravel and use ceramic pins 10, 1
An experiment was performed to measure the degree of uneven wear of 1, 110 and 111. Note that the degree of uneven wear is determined by the bands 8, 9, 108 of the ceramic pins 10, 11, 110, 111,
The outer shape of the end face on the 109 side was observed, and the value of minimum diameter / maximum diameter was defined as the uneven wear rate. Then, as an evaluation standard, when the uneven wear rate exceeds 0.7, the weight ratio passing through a 5 mm sieve becomes 85% or less, and the 5 mm sieve, which is the condition of fine aggregate used for concrete, is expressed in terms of weight ratio. Since it passes through the condition of passing 85% or more and passing 10 mm all the way, it was judged good if the uneven wear rate was 0.7 or more, and unusable if it was less than 0.7. In addition, the ceramic pin 10,
11 having a key groove 17 at both ends has an uneven wear rate of 0.1.
Before the number 7, the directions of the ceramic pins 10 and 11 were changed.

The results are as shown in Table 1.

[0046]

[Table 1]

As a result, in the conventional cage-type pulverizer 101 having the mounting structure shown in FIG. 6, the uneven wear rate became less than 0.7 after 400 hours.

In the mounting structure shown in FIG. 1, the cage type pulverizer of the comparative example in which the phase difference P of the key grooves 17 formed at both ends of the ceramic pins 10 and 11 is the same,
Although it could be used even after 0 hours, the uneven wear rate was 0.7 units, and it was difficult to use it for a long time thereafter.

On the other hand, the cage type pulverizing apparatus 1 of the present invention having the mounting structure shown in FIG. 1 can be used even after 800 hours, and the uneven wear rate is still 0.8 units. It has an extra capacity and can be used for a long period of time, and the life of the ceramic pins 10 and 11 can be greatly extended.

(Experimental Example 2) Next, of the mounting structure shown in FIG. 1, in the cage type pulverizing device 1 in which the phase difference P of the key grooves 17 formed at both ends of the ceramic pins 10 and 11 was 45 °, Radius of curvature 1 on the outer edge of pin 10
An experiment was conducted to examine the degree of wear of the ceramic pin when the curved surface 10a of about 8 mm was formed. The directions of the ceramic pins 10 and 11 were changed after 400 hours.

The results are as shown in Table 2.

[0052]

[Table 2]

As a result, Sample No. In the case where the radius of curvature R is less than 3 mm, such as 11 and 12, the ceramic pins 10 and 11 were chipped, and the uneven wear rate became less than 0.7 after 400 hours.

The sample No. If the radius of curvature R exceeds 5 mm as in 16 to 18, the ceramic pins 10, 1
1 and the gaps between the protective liners 3 formed on the bands 8 and 9 are too large, and the pulverized material enters the gaps and wears the ceramic pins 10 and 11, and after 400 hours, the uneven wear rate becomes 0. It was less than 7.

On the other hand, the sample No. When the curvature radius R is in the range of 3 to 5 mm as in 13 to 15, the ceramic pins 10 and 11 are not chipped, and even after 400 hours, the uneven wear rate is 0.7 or more. Thus, the life of the ceramic pins 10 and 11 could be improved.

As described above, the outer peripheral edge portions of the ceramic pins 10 and 11 are formed on the curved surface 10a having the radius of curvature R of 3 to 5 mm.
It can be seen that the life of the ceramic pins 10 and 11 can be improved by doing so.

[0057]

As described above, according to the present invention, a plurality of cage members having different diameters in which a plurality of ceramic pins are sandwiched between a disk-shaped rotating disk and a ring-shaped band are formed concentrically in a casing. In the cage type pulverizing device, in which the objects to be pulverized are thrown while the upper cage members are being rotated, and the objects to be pulverized collide with the ceramic pins to be pulverized, the ceramic pins pass through both ends. Through holes and 4 to 8 key grooves are provided at equal intervals on both ends of the through holes, and the phase difference between the key grooves on one end and the other end is 30 to 60 °, The through hole has a female thread at both ends and a metal shaft provided with a key groove on at least one end side is inserted therethrough. A space formed by the key groove of the metal shaft and the key groove of the ceramic pin is provided. The key to While fixing the mic pin and the metal shaft, a bolt is inserted into a screw hole of the rotating disk and the band arranged on both sides of the ceramic pin, and a male screw portion of the bolt is screwed into a female screw portion of the metal shaft. By forming the cage member by sandwiching the ceramic pin between the rotating disk and the band, the ceramic pin can be used until the band side outer periphery of the severely worn ceramic pin is evenly worn, and the ceramic pin can be used. Since the pins can be used with their directions interchanged, the service life of one ceramic pin can be improved to 1.5 times or more the conventional one.

According to the present invention, by forming the outer peripheral edge of the ceramic pin as a curved surface having a radius of curvature of 3 to 5 mm, the cage member is distorted and collides with the rotating disk or the protective liner of the band. In addition, it is possible to prevent the outer peripheral edge of the ceramic pin from being damaged, and to prolong the life of the ceramic pin.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a cage type pulverizing apparatus according to the present invention.

FIG. 2 is a partially cutaway sectional view showing an attachment structure of one ceramic pin constituting a large cage member in FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a schematic sectional view showing a conventional cage-type pulverizer.

FIG. 5 is a partially cutaway sectional view showing an attachment structure of one ceramic pin constituting a large cage member in FIG. 4;

FIG. 6 is a partially cutaway sectional view showing another example of a mounting structure of one ceramic pin constituting a large cage member in FIG. 4;

[Explanation of symbols]

1, 101: cage-type crusher 2, 102: casing 2a, 102a: inner wall surface of casing 3, 103: protective liner 4, 104: metal shaft 5, 105: through hole 6, 106, 7, 107: rotating disk 8 , 108, 9,
109: band 10, 110, 11, 111: ceramic pin 10
a: Curved surface 12, 112: Large-diameter cage member 13, 113: Small-diameter cage member 14, 114, 15, 115: Rotating shaft 16, 116,
17, 117: Keyway 18, 118: Female thread 118a: Reverse thread 19:
Male screw part 20, 120: Key 21, 121: Drive shaft 22, 1
22: Elastic member 23, 123: Bolt 24, 124: Spacer 25, 125, 26, 126: Screw hole 127: Male thread 128: Nut 30, 130: Input port 31, 131: Output port

Claims (2)

[Claims] A plurality of cage members having different diameters, each having a plurality of ceramic pins sandwiched between a rotating disk and a band, are installed in a casing so as to be rotatable concentrically, and each upper cage member is rotated. In the cage type pulverizer in which the object to be ground is thrown by crushing the object to be ground by colliding with the ceramic pin of each cage member, the ceramic pin has a through hole penetrating both ends, Four to eight key grooves provided at both ends are provided at equal intervals, and the phase difference between the key groove on one end and the key groove on the other end is 30 to 60 °. A metal shaft having female threads at both ends and having a key groove on at least one end side is inserted, and a key is engaged with a space defined by the key groove of the metal shaft and the key groove of the ceramic pin. Let the above ceramic A pin is fixed to the metal shaft, and a bolt is inserted into each of the bolt holes of the rotating disk and the band arranged at both ends of the ceramic pin, and a male screw portion of the bolt is screwed into a female screw portion of the metal shaft. A cage-type pulverizing device, wherein the cage member is formed by combining the ceramic pins between a rotating disk and a band by combining the ceramic pins. 2. The ceramic pin according to claim 1, wherein the outer peripheral edge of the ceramic pin has a curved surface with a radius of curvature of 3 to 5 mm.
The cage-type pulverizing device according to item 1.