JPS6336845A - Centrifugal crusher - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a centrifugal crusher, and in particular, raw materials such as rocks fed to a rotor rotating at high speed are blown outward from an outlet on the circumferential surface of the rotor by centrifugal force. This relates to centrifugal crushing in which crushed pieces accumulated in a crushing chamber around the material are collided with a raw material accumulation layer to be formed.

Conventional technology and its problems In order to crush the raw materials that fly out of the rotor, a method has been generally adopted in which the material is collided with a rigid repulsion plate, but this method has the disadvantage that the repulsion plate is easily worn out. In order to overcome these shortcomings, a method has recently been developed in which the raw material is crushed by colliding with a raw material deposit layer formed from crushed pieces. This type of method crushes the raw materials by collision between the raw materials, so it does not have the drawbacks of the conventional method mentioned above and is extremely superior in practice.However, this type of method also has the following drawbacks. there were. This is because when the crushed particles pass through the raw material accumulation layer, they transfer, jump, slide, etc. in the raw material accumulation layer, resulting in fine powder adhering to the product, which impairs the product value.

Means for Solving the Problems This invention removes powder and dust adhering to the raw material particles by colliding the raw material particles to be crushed with an adhesion removing means made of a rigid body, thereby using the above-mentioned centrifugal crusher. The aim is to improve the quality of the products obtained.

That is, the present invention has a rotor that rotates at high speed and a crushing chamber provided around the rotor, and the raw material fed from the axis of the rotor is blown outward from the outlet on the circumferential surface of the rotor by centrifugal force. In a centrifugal crusher that collides with and crushes a material accumulation layer formed from crushed pieces accumulated in a crushing chamber, the material accumulation layer is dammed and/or the material accumulation layer is dammed up over the entire circumference of the crushing chamber or at appropriate intervals in the circumferential direction. A rigid adhesion removing means protruding from the layer is provided, and crushed and scattered raw material particles collide with the adhesion removing means to remove powder dust etc. adhering to the raw material particles. be.

Here, the adhesion removal means can include bottles or grid-shaped devices arranged on the circumference of the crushing chamber, which have the function of damming up the raw material accumulation layer, but a wear-resistant ring is a preferable example. It is mentioned as.

Items that protrude from the raw material accumulation layer include the above-mentioned pins, lattice-shaped items, ring-shaped items, etc. arranged radially in the crushing chamber or in multiple rows, that is, concentrically, as well as radially or circumferentially arranged pins, etc. Straight or curved blades arranged at intervals may be mentioned by way of example.

The above-mentioned adhesion removal means may also be composed of a single unit or a combination of a plurality of frameworks.

Operation The operation of the present invention will be explained with reference to an example in which a ring is provided on the circumference of the crushing chamber as shown in FIG. The crushed pieces 4 transfer, bounce, slide, etc. onto the raw material accumulation layer, adhere to fine powder and dust, and fall from between the rotor 1 and the ring 5 in this state. Most of the raw material flying out from the rotor 1 collides with the raw material accumulation layer 3.
A portion collides with the broken pieces 4 falling through the rotor l and the circle of the ring 5, thereby causing the broken pieces 4 to collide with the ring 5,
Removes fine powder and dust that adheres when being struck. The crushed pieces 4 falling between the rotor and the ring are also collided with other crushed pieces that collide with the raw material accumulation layer 3, are crushed, fly off, hit the casing liner 6, the rotor 1, etc., and bounce back. As a result, the crushed pieces 4 collide with the ring in the same way, dropping fine powder and dust.

In the example described above, it is desirable that the height of the ring 5 is such that its upper end is located within a range of about 172 to 174 from the exit of the rotor circumferential surface. If the height of the ring 5 is lower than the above range, the raw material flying out from the rotor will have a chance of colliding with the crushed pieces, reducing the effectiveness of removing fine powder and dust. On the other hand, if the height of the ring 5 is higher than the above range, a large amount will be removed. The raw material comes to collide with the ring 5, and the ring 5 becomes easily worn.

The table below shows comparative experimental data on products obtained with and without ring 5, and when the entire surface of the crushing chamber is covered with the ring and all the raw materials that fly out from the rotor collide with the ring. . Here, as is clear from the above table in which the height of the ring is located at about 173 points from the exit of the rotor circumferential surface, when a ring as shown in this example is used, and when no ring is used, Compared to the conventional method, the amount of fine powder adhering to the crushing chamber is greatly reduced, and it is no different from the case where the entire surface of the crushing chamber is covered with a ring. However, on the other hand, there is no decrease in the performance rate, and the cost increase due to wear is small.

Embodiment In FIG. 1, a feed pipe 9 attached to a frame 8 is fitted into an upper shaft hole of a rotor 1 which is rotationally driven by a motor (not shown), and feeds raw materials dropped from a chute guide 10. The ore is fed to the rotor 1 through a pipe 9, and is projected from an outlet on the circumferential surface. A ring 5 extending upward is protruded from the lower end of a crushing chamber 2 surrounding a rotor 1.

According to this embodiment, the raw material deposit N3 is raised by the ring 5, so that the raw material deposit layer 3 becomes narrower, and as a result, the amount of transfer, bouncing, and sliding becomes relatively small, and the amount of adhesion of fine powder and dust is reduced. Since the gap between the raw material accumulation layer 3 and the casing liner 6 becomes narrow, the chances of the crushed pieces bouncing back from the raw material accumulation layer colliding with the liner 6 are relatively increased, and adhering fine powder and dust can be easily removed. Furthermore, the structure is extremely elaborate as it simply has a ring in the crushing chamber.

In the embodiment shown in FIG. 3, rings 5 and 13 are arranged concentrically at appropriate intervals in the radial direction in the crushing chamber 2, and raw material deposit layers 14 and 15 are placed on both sides of the center ring 13.
is modeled, and the height of the ring 13 is equal to the raw material accumulation N
It is formed higher than 15.

In the case of this embodiment, in addition to obtaining the same effects as in the above-mentioned embodiment, the collision of the sides of the puffer fish 13 is added, and the removal of fine powder is further facilitated.

As shown in FIG. 5, the embodiment shown in FIG. 4 has a framework 20 in which a plurality of vanes 17 are arranged side by side at appropriate angles and the lower and rear surfaces are connected by arcuate strips 18 and 19, respectively. They are arranged radially in the crushing chamber 2, and the upper end of each blade protrudes from the raw material accumulation layer 3 by an appropriate height, and is inclined at the slope of the raw material accumulation layer.

In the case of this embodiment, the crushed pieces passing over the raw material accumulation layer collide one after another with the blades protruding onto the core layer, thereby removing adhering fine particles, and then being discharged as a product to the discharge port.

The embodiment shown in FIG. 6, as shown in FIGS. 7 and 8,
A plurality of vanes 22 are arranged at appropriate intervals in the tangential direction of the circle, an arcuate plate 23 is fixed to the inner circumferential side, a strip plate 24 is fixed to the back side, and adjacent vanes 22 are arranged in an arc shape 25 at the intermediate part. A framework 26 having a connected structure is arranged circumferentially in a crushing chamber, and the blade plate 22 is connected to the blade plate 17 shown in FIG.
Similarly, its upper end protrudes from the raw material deposition layer, and the slope is the same as that of the raw material deposited layer. The arcuate plate 23 and the arcuate piece 25 have the same functions as the rings 5 and 13 in the embodiment shown in FIG.

In the case of this embodiment, it has both the functions of the ring and the vane in the above-mentioned embodiments, and the removal of fine powder is further increased.

Effects of the Invention As described above, the present invention is a centrifugal crusher of the type that crushes raw materials by colliding with each other, by providing a means for removing adhesion of fine powder in the crushing chamber around the rotor, and causing crushed pieces to collide with this. This machine is designed to remove fine powder that adheres to the raw material during transfer, jumping, sliding, etc. on the raw material accumulation layer, as well as fine powder that adheres to the raw material fed into this crusher. It is possible to reduce the amount of fine powder and dust adhering to the product without impairing wear resistance, and the quality of the product can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment, Fig. 2 is an explanatory diagram of the operation, Fig. 3 is a sectional view of the second embodiment, Fig. 4 is a sectional view of the third embodiment, and Fig. 5 is a sectional view of the third embodiment. FIG. 6 is a sectional view of the fourth embodiment, FIG. 7 is a plan view of the framework used in the fourth embodiment, and FIG. 8 is a perspective view of the framework used in the fourth embodiment. It is an A-line sectional view. 1... Rotor 2... Crushing chamber 3... Raw material accumulation layer 4... Crushed pieces 5... Ring 6... Casing liner 13... Ring 14.15... Raw material accumulation layer 17... Vane plate
20... Frame m 22... Wing plate 23... Arc plate
25...Arc-shaped provisional 26...Framework Applicant Kotobuki Giken Kogyo Co., Ltd. Agent Patent Attorney Akira Sato - 1st Question 31 Figure 4 Figure 6 Figure 5 Square 7E Figure 8

Claims (4)

[Claims] (1) It has a rotor that rotates at high speed and a crushing chamber provided around the rotor, and the raw material fed from the axis of the rotor is blown outward from the outlet on the circumferential surface of the rotor by centrifugal force.
In a centrifugal crusher that collides with and crushes a material accumulation layer formed from crushed pieces accumulated in a crushing chamber, the material accumulation layer is dammed and/or A centrifugal crusher that is provided with a rigid adhesion removal means that protrudes from the raw material accumulation layer, and that causes the raw material particles to be crushed to collide with the adhesion removal means to remove powder, dust, etc. adhering to the raw material particles. (2) The collision means is a ring arranged concentrically in one or more rows in the radial direction, the height of which is gradually increased toward the outside in the radial direction, or a large number of blocks arranged on the circumference of the patent. Centrifugal crusher described in scope 1 (3) The centrifugal crusher according to claim 1 or 2, wherein the collision means are straight or curved blades arranged radially or circumferentially at appropriate intervals. (4) The centrifugal crusher according to claim 1, wherein the collision means is composed of a single frame or a combination of multiple frames.