JPH0732884B2 - Horizontal crusher - Google Patents

Description

The present invention relates to a crusher, and particularly to an ultrafine particle having an average crushed particle size of several microns or less used in a CWM (high-concentration coal water slurry) manufacturing facility. The present invention relates to a crushing device effective for crushing.

[Conventional technology]

A so-called wet tube mill having a structure shown in FIGS. 9 and 10 is conventionally known as a crushing device.

In FIG. 9, the raw material slurry charged into the fixed cylinder 50 from the water injection pipe 37 and the coal injection pipe 38 is fed into the crushing chamber inside the main cylinder 41 by the feeder 40 which is driven to rotate by the motor 39.
Supplied to 42. Both ends of the main cylinder 41 are bearings via the rotary cylinder 49.
It is supported by 35 and receives the power of the motor 31 via the speed reducer 32, the motor side gear 33 and the cylinder side gear 34 to rotate.
A gland packing 36 impregnated with a lubricant is inserted in a sliding portion between the rotary cylinder 49 and the fixed cylinder 50.

A crushing ball 42 is housed in the crushing chamber 42 in the main cylinder 41, and a scraping plate 51 for scraping up the ball 43 is attached to the inner wall of the main cylinder 41.

Further, a slurry storage chamber 46 is formed in the main cylinder 41 adjacent to the crushing chamber 42 on the side opposite to the fixed cylinder 50 via an eye plate 44 having a slurry discharge hole 45. The slurry, which is the crushed material stored inside, is discharged to the outside from the slurry discharge pipe 48 by the slurry discharge guide plate 47.

The principle of pulverization in this conventional wet tube mill is based on repeated movements in which the balls 43 are scraped up by the scraping plate 51 and fall as the main cylinder 41 rotates. The crushing action in this case is impact crushing by the impact force caused by the fall of the balls 43, and the balls 43 or the balls 43 and the main cylinder.
It is well known that the main subject is the impact crushing of the former, though it can be divided into grinding by frictional force generated between the inner wall of 41 and 41.

[Problems to be solved by the invention]

According to the research conducted by the inventors, impact crushing is effective for crushing with a crushing average particle size of several tens of microns to several hundreds of microns, and therefore, the above-described conventional wet tube mill has a large crushing effect.

However, in the case of ultra-fine pulverization such that the pulverized average particle size is several microns or less, the result is that grinding is far more effective, and it cannot be expected that the conventional wet tube mill has the pulverizing effect. become. Moreover, the conventional wet tube mill has a problem that noise is generated when the balls 43 are dropped and the balls 43 are damaged.

Further, in the conventional wet tube mill, if the viscosity of the slurry increases, a so-called co-rotation phenomenon occurs in which the slurry rotates together with the balls, and the grinding effect is impaired. Generally, the surface area of a solid, so-called specific surface area, increases in proportion to the reciprocal of the particle size, and therefore the specific surface area increases as ultrafine pulverization proceeds. Therefore, the finer the pulverization, the more the viscosity of the slurry increases, and the problem of the reduction of the pulverization effect due to the co-rotation phenomenon becomes more remarkable.

Further, in the conventional wet tube mill, there is a problem that the center portion of the main cylinder 41 is a dead space that hardly contributes to the crushing, and the crushing power is wasted accordingly.

The present invention has been made to solve the above-mentioned conventional problems, reduces the proportion of impact crushing to facilitate grinding, and suppresses the phenomenon of co-rotation between the object to be crushed and the crushing ball. Accordingly, it is an object of the present invention to provide a crushing device which can effectively perform ultra-fine crushing, generate less noise and less damage to balls, and can reduce crushing power.

[Means for solving problems]

According to the present invention, in order to solve the above-mentioned problems, an outer cylinder and an inner cylinder that are horizontally placed and are relatively rotated are provided, and a space between the outer cylinder and the inner cylinder serves as a crushing chamber, and 10mmφ ~ number 10
A grinding ball with a diameter of mmφ is filled at a filling rate of 50 to 90% and the material to be crushed is supplied, and the outer cylinder and the inner cylinder are provided with blades arranged independently in the axial direction and the circumferential direction. The sum of the radial lengths of the blades attached to the outer cylinder and the inner cylinder is not less than half the radial distance of the crushing chamber, and the crushing balls are provided at the end of the crushed product discharge side of the crushing chamber. There is provided a horizontal crushing device characterized by arranging a concentric circular plate for separating a crushed product and having a plurality of openings having an area larger toward the inner wall side of the outer cylinder.

[Action]

In the crushing apparatus according to the present invention, the object to be crushed supplied into the crushing chamber is crushed by the relative rotation of the outer cylinder and the inner cylinder. In this case, the inner cylinder provided inside the outer cylinder
At the same time as the impact force of the ball falling in the crushing chamber is weakened, the frictional force due to the rotational movement of the ball increases.

On the other hand, the outer cylinder and the inner cylinder are fitted with blades arranged independently in the axial direction and the circumferential direction, and the sum of the radial lengths of the blades respectively mounted on the outer cylinder and the inner cylinder is calculated in the radial direction of the grinding chamber. When the distance is half or more, the co-rotation phenomenon between the object to be crushed and the crushing ball is effectively suppressed.

Further, the crushed material is accumulated on the inner wall side of the outer cylinder more than the outer wall side of the inner cylinder by its own weight, but the crushing balls and the crushed material are separated from each other in the concentric circle shape arranged at the end of the crushing chamber on the crushed material discharge side. In addition, by using a mesh plate having a plurality of openings whose area is larger toward the inner wall of the outer cylinder, it is possible to smoothly discharge the crushed material and prevent clogging of the openings.

Further, by setting the diameter of the crushing balls to 10 mmφ to several tens of mmφ, sufficient crushing energy can be applied to the crushing balls, and a sufficient number of crushing balls can be secured to improve the crushing efficiency.

Furthermore, by setting the filling rate of the grinding balls to 50-90%, the probability of grinding is reduced by 100% due to the free falling of the grinding balls, the grinding efficiency per unit volume of the grinding chamber is reduced, and It is possible to avoid the reduction of the pulverization efficiency due to the poor movement of the pulverization balls due to the lack of space.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention in which an inner cylinder 2 is provided inside an outer cylinder 1 and a crushing chamber 14 is formed between them as shown in FIG. There is. Outer cylinder 1 and inner cylinder 2
, But the outer cylinder 1 is configured to rotate in this embodiment.

That is, the outer cylinder 1 rotates by the power of the motor 3 being transmitted through the speed reducer 4, the motor-side gear 5, and the outer cylinder-side gear 6. Flange 7 is attached to both ends of outer cylinder 1, and flange 7 is supported by bearing 8.

On the other hand, both ends of the inner cylinder 2 are supported by fixed tubes 10, and these fixed tubes 10 are firmly fixed to a foundation (not shown) by fixing fittings 9. A gland packing 11 impregnated with a lubricant is inserted in a sliding portion between the flange 7 and the fixed tube 10.

A slurry supply pipe 12 is connected to one of the fixed pipes 10,
The raw material slurry, which is the object to be crushed, is introduced into the crushing chamber 14 from the slurry supply pipe 12 through the slurry supply hole 13. Crushing room
Balls for crushing with a diameter of 10 mmφ to several tens of mmφ 15
Is filled at a filling rate of about 50 to 90%. The crushing balls 15 are given a strong rotational movement by the rotation of the outer cylinder 1.

Here, if the diameter of the crushing ball 15 is less than 10 mmφ, it is difficult to give a sufficiently large crushing energy to the crushing ball 15, and if the rotation speed of the outer cylinder 1 is increased to increase the crushing energy, the crushing ball 15 The abrasion of the crushing balls 15 increases, and the crushing balls 15 may be damaged in some cases.
Further, the power is proportional to the number of revolutions of the outer cylinder 1, and the amount of heat generated in the crushing device is also proportional to the power. Therefore, the temperature of the object to be crushed becomes high and the power consumption increases. Further, if the diameter of the crushing balls 15 is increased more than necessary, the number of the crushing balls 15 decreases, and the demerit of decreasing the crushing probability due to the decrease of the number becomes larger than the merit of increasing the crushing energy.
As a result, the grinding efficiency is reduced. Therefore, crushing balls
The diameter of 15 is suitably in the range of 10 mmφ to several tens of mmφ.

On the other hand, regarding the filling rate of the grinding balls 15, this is 50%.
If the crushing ball 15 falls below the
The grinding probability of 100% is reduced, and the grinding efficiency per unit volume of the grinding chamber 14 is reduced. On the other hand, if the filling rate of the crushing balls 15 exceeds 90%, the crushing balls 15 will malfunction due to the lack of free space in the crushing chamber 14, and the crushing efficiency will fall despite the large power. Therefore, the filling rate of the crushing balls 15 is appropriately in the range of 50 to 90%.

Thus, due to the rotational movement of the crushing balls 15 that accompanies the rotation of the outer cylinder 1, the slurry is finely pulverized mainly by grinding. The crushed slurry has a concentric shape that is opened in the eye plate 16 as shown in FIG. 2 on the side opposite to the supply side of the raw material slurry, and both ends thereof are located on the radiation extending from the outer wall side of the inner cylinder 2, That is, the area is separated by the slits 17 which are a plurality of openings having a larger area toward the inner wall side of the outer cylinder 1 and sent to the slurry storage chamber 18. A slurry discharge hole 19 is opened on the outer periphery of the slurry storage chamber 18, and the slurry is discharged from these slurry discharge holes.
19 from the slurry discharge guide plate 20 to the slurry discharge pipe 21
Is discharged to the outside. In this case, the crushed material is more likely to be accumulated on the inner wall side of the outer cylinder than on the outer wall side of the inner cylinder due to its own weight, but since the area of the slit 17 as the opening is larger on the inner wall side of the outer cylinder 1, the crushed material is discharged. Can be smoothed, and the slit 17 can be prevented from being clogged.

FIG. 3 shows the second embodiment of the present invention.
Since the second embodiment is different from the first embodiment only in that the inner cylinder 1 is fixed and the inner cylinder 1 is rotated, the portions corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 shows a third embodiment of the present invention, in which the stirring blade 22 is attached to the inner wall of the rotating outer cylinder 1 in the first embodiment (FIGS. 1 and 2), and the inner cylinder 2 is fixed. Vanes on the outer wall of 23
Is attached.

According to this third embodiment, the action of the stirring blades 22 gives the grinding balls 15 a strong rotational movement. Even if the crushing progresses and the viscosity of the slurry increases,
Due to the presence of 23, there is almost no entrainment between the slurry and the crushing balls 15, and ultrafine particles having an average particle diameter of several microns or less can be easily obtained.

FIG. 5 shows a fourth embodiment of the present invention, in which the stationary blades 22 are attached to the inner wall of the fixed outer cylinder 1 in the second embodiment (FIG. 3), and the outer wall of the rotating inner cylinder 2 is agitated. The wings 23 are attached. Also in this embodiment, the same effect as in the third embodiment can be obtained.

When a crushing device based on the configurations of the third and fourth embodiments was actually manufactured and subjected to a production test of CWM (high-concentration coal water slurry) having a coal weight concentration of 55%, an average particle diameter of 2.5 microns ( Even when the slurry was crushed to a viscosity of about 1000 centipoise), there was no co-rotation between the slurry and the crushing balls 15, and ultrafine crushing was possible.

FIG. 6 shows a fifth embodiment of the present invention, which is an outer cylinder 1 and an inner cylinder 2.
And are configured to rotate in opposite directions.
That is, the outer cylinder 1 includes the motor 3a, the speed reducer 4a, and the gear on the motor side.
5a and the outer cylinder side gear 6a are rotated, and the inner cylinder 2 is rotated via the motor 3b, the speed reducer 4b, the motor side gear 5b, and the inner cylinder side gear 6b. In this embodiment, blades (stirring blades) 22 and 23 are attached to both the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 2. Here, the blades 22 and 23 are independent in the axial direction and the circumferential direction, and at least one (the blade 23 in this example) is as shown in the figure.
The blades 22 and 23 are phase-shifted by 90 °, and the sum of the radial lengths of the blades 22 and 23 is set to be more than half the radial distance of the grinding chamber 14.

According to this embodiment, the co-rotation phenomenon between the slurry and the grinding balls 15 can be more effectively suppressed by the synergistic action of the stirring blades 22 and 23 and the reverse rotation of the outer cylinder 1 and the inner cylinder 2. it can.

In FIG. 6, the stirring blades 22 and 23 are attached to both the outer cylinder 1 and the inner cylinder 2, but as shown in FIG. 7 (sixth embodiment), the stirring blades 22 are provided only on the inner wall of the outer cylinder 1. May be attached,
As shown in FIG. 8 (seventh embodiment), the stirring blade 23 may be attached only to the outer wall of the inner cylinder 2.

The present invention can be variously modified and implemented without departing from the scope of the invention. For example, in the above description, the case where the crushing device of the present invention is applied to the CWM manufacturing facility has been described, but the present invention can be applied to a crushing device of, for example, ceramics or calcium carbonate other than CWM. It is useful for ultra-fine grinding of a few microns or less.

〔The invention's effect〕

According to the present invention, since the crushing is performed by the relative rotation of the outer cylinder and the inner cylinder, impact crushing is suppressed and the grinding action is effectively generated. Moreover, by the action of the wings attached to at least one of the outer cylinder and the inner cylinder,
The co-rotation phenomenon between the object to be crushed and the crushing ball, which is an obstacle to ultrafine crushing, is suppressed. With these, it is possible to easily realize ultrafine pulverization having an average pulverized particle size of several microns or less.

Further, noise and ball damage due to the falling of the crushing balls are reduced, and the dead space is reduced by forming the crushing chamber between the outer cylinder and the inner cylinder, so that the crushing power is reduced. There is.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a crushing apparatus according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS.
FIG. 8 is a vertical cross-sectional view of a crushing device according to the second to seventh embodiments of the present invention, FIG. 9 is a vertical cross-sectional view of a conventional crushing device, and FIG. 10 is a cross-sectional view taken along the line BB of FIG. Is. 1 …… Outer cylinder, 2 …… Inner cylinder, 3,3a, 3b …… Motor, 4,4a, 4b
...... Reducer, 5,5a, 5b, 6,6a, 6b …… Gear, 7 …… Flange, 8 …… Bearing, 9 …… Fixing metal fitting, 10 …… Fixing tube, 11…
… Gland packing, 12 …… Slurry supply pipe, 13 …… Slurry supply hole, 14 …… Grinding chamber, 15 …… Grinding ball, 16 ……
Eye plate, 17 ... slit, 18 ... slurry storage chamber, 19 ... slurry discharge hole, 20 ... slurry discharge guide plate, 21 ... slurry discharge pipe, 22,23 ... wing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Nishizawa Kenji Nishizawa 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (72) Inventor Hisao Yamamoto 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries Co., Ltd. Nagasaki Research Institute (72) Inventor Shozo Kaneko 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor Gen Takatsuka 1-1, Atsunoura-cho, Nagasaki-shi Mitsubishi Heavy Industry Co., Ltd. Nagasaki Shipyard (72) Inventor Toshihiko Imamoto 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard (72) Inventor Katsuyuki Ueda 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor Yoshishige Uematsu 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki General Manager, Mitsubishi Heavy Industries Ltd. Shipyard (56) References Patent Sho 61-8143 (JP, A) the actual public Akira 40-23754 (JP, Y1)

Claims (1)

[Claims] 1. A crushing chamber having an outer cylinder and an inner cylinder which are horizontally placed and rotated relative to each other, and a space between the outer cylinder and the inner cylinder serves as a crushing chamber, and the crushing chamber has a diameter of 10 mmφ to several tens of mmφ for crushing. 50 to 90 balls
Filling at a filling rate of 10% and supplying the object to be crushed,
The outer cylinder and the inner cylinder are attached with blades respectively arranged in the axial direction and the circumferential direction, and the sum of the radial lengths of the blades respectively attached to the outer cylinder and the inner cylinder is the radial distance of the grinding chamber. A plurality of openings that are concentric and have an area that is larger toward the inner wall side of the outer cylinder for separating the crushing balls and the crushed product at the crushed product discharge side end of the crushing chamber. A horizontal crushing device characterized by arranging eye plates.