JPH04235753A - Horizontal impact type crusher - Google Patents

Abstract

PURPOSE:To provide a horizontal impact type crusher capable of not only crushing an object to be crushed but also smoothly arranging the surface of a particle. CONSTITUTION:A stock box 8 formed of an inclined surface 81 directed in a vertical direction and a horizontal surface 82 is provided to a casing so as to be downwardly directed from the outside of the lowermost end part of the barrier plate 6B provided in the casing so as to be movable in a horizontal direction. Since an object to be crushed is temporarily accumulated on the stock box and mutually collides with the object to be crushed falling from above, the sharp corner or ridgeline of the surface of a particle is shaven off to become smooth.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an improvement in a horizontal impact crusher used for crushing rocks and the like.

0002

[Prior Art] In order to crush rocks and use them as aggregates, they are usually crushed to a desired particle size using a compression crusher for primary and secondary crushing, such as a jaw crusher or cone crusher. Then, tertiary crushing is applied using an impact crusher to obtain a product with the desired particle size and shape as aggregate. In this case, numerous technological improvements have been accumulated aimed at increasing crushing efficiency and reducing operating costs.

For example, as shown in FIG.
In Publication No. 31, a rotor 3a is arranged in the center of a casing 1a, a crushed material inlet 5a is provided in the upper center of the casing, and collision plates 6 are arranged in two rows on the upper and lower sides of the upper half of the left and right sides of the casing.
a, 6b are rotatably mounted so that the gap t between them and the rotating circle of the striking element 4a can be adjusted, and the lower end of the lower collision plate 6b is positioned near a horizontal line passing through the center of the rotor, so that the rotor can be rotated in forward and reverse directions. The configuration is disclosed. With this technology, the material to be crushed that falls from the center of the top repeatedly collides with the upper and lower collision plates and is subjected to crushing action many times with the impactor, improving crushing efficiency and achieving the desired particle size. The company claims that it is easy to control the particle size because the crushed material is discharged through the gap t between the tip of the lower collision plate and the tip of the impactor. Furthermore, since they are bilaterally symmetrical, if one of the striking elements or collision plate wears out, it is not necessary to immediately replace it, but by reversing the striking element and rotating the rotor, the condition can be restored to the same condition as when it was new.
Another advantage is that the upper half of the casing can be opened and closed, making it easy to replace parts.

0004

SUMMARY OF THE INVENTION It is well understood that the prior art exemplified here has an advantageous effect on improving crushing efficiency and maintenance of equipment. Furthermore, for this purpose, for example, a system in which a plurality of collision plates are stacked vertically has already been announced in British Patent No. 1309560, and a system in which collision plates are arranged symmetrically is disclosed in Japanese Patent Publication No. 54-4775. Recognized in many places, including official publications.

However, as mentioned earlier, raw stones such as rocks are crushed under intense pressure during primary and secondary crushing, and while they are rapidly refined into fine grains, they also become flat and flaky. There are many latent cracks that are just one step away. When such flat aggregate consisting of sharply angular tips and ridges is mixed as concrete aggregate and poured into formwork etc. in the form of a slurry, it is not desirable in terms of its fluidity or filling properties. Needless to say, it has a negative impact. In other words, even if the particle size distribution is the same, there are large differences in the evaluation as aggregate depending on the shape of the surface and the presence or absence of cracks hidden inside.However, improvements that focus on this point cannot be achieved with conventional technology. This is a challenge.

[0006] In order to solve the above-mentioned problems, the present invention aims to provide a horizontal impact type crusher with a particle size regulating action that is effective in improving the properties required for aggregate.

[0007]

[Means for Solving the Problems] A horizontal impact crusher according to the present invention has a plurality of impactors mounted on the outer periphery of a rotor supported by a main shaft rotatably installed horizontally in a casing. At least one collision plate is tiltably suspended diagonally above the rotor, and a discharge port is provided below. The problem was solved by installing a stock box (stay shelf) formed by a vertically oriented inclined surface and a nearly horizontal surface that protrudes so that it can move forward and backward.

More specifically, if A is the shortest distance between the trajectory of the tip of the striker as it rotates and the collision plate, and B is the shortest distance between the trajectory and the stock box, then B≧A. , a configuration in which the input port for crushed materials is provided diagonally above the casing, and one or more collision plates are suspended diagonally above the rotor, and a configuration in which the input port for crushed materials is provided in the upper center of the casing, and one or more collision plates are suspended diagonally above the rotor. Alternatively, it has been shown that a configuration in which a plurality of collision plates are suspended from diagonally above the rotor symmetrically, the stock box protrudes evenly from the left and right sides, and the main shaft is rotatable in forward and reverse directions are both desirable embodiments.

[0009]

[Operation] The horizontal impact crusher of the present invention drops the crushed material (for example, crushed stone of intermediate particle size after secondary crushing) from above the casing (diagonally above or in the upper center), as in the known technology.
It collides with a striker on the outer periphery of the rotating rotor and is shattered, and at the same time is thrown diagonally upward, collides with the surface of a diagonally suspended collision plate, and is shattered, at the same time being bounced back toward the rotor. When a plurality of collision plates are arranged in two rows, one above the other, and facing diagonally, the number of repetitions of this repulsion back and forth increases further, and eventually the contact between the lower end of the lowest collision plate and the circle drawn by the tip of the rotating striker increases. The crushed material crushed into particles smaller than the shortest distance A escapes downward. Here, since the stock box, which is a feature of the present invention, protrudes downward from the outside near the lowest end of the collision plate, the crushed material that has fallen downward is bounced off again by the rotor's striker, and this stock box is provided. The objects temporarily stop on the horizontal plane of the box, and as the work progresses, the objects accumulate in a triangular shape until they reach approximately the angle of repose. The surface of the stuck object is formed with countless irregular irregularities, and the broken objects and the stuck object that are thrown into this area one after another collide and rub against each other, so the angular tips and ridges are The surface changes into fine grains with rounded edges and rounded edges as they scrape off each other. In other words, a kind of mutual grading of the crushed materials takes place in this part, and as the angle of repose allows, some of them fall down and some of them stay, and while they are constantly replaced, the mutual pulverization and grading of the crushed materials of the same hardness continue. It will be done.

0010

[Embodiment] Fig. 1 shows an embodiment of the present invention, and a casing 1
A plurality of impactors 4 are evenly mounted on the outer periphery of a rotor 3 supported by a main shaft 2 in the casing, and an input port 5 for the material to be crushed S is opened diagonally above the casing, and an input port 5 for the material to be crushed S is opened diagonally upward in the opposite direction to the input port. Two collision plates 6A and 6B are tiltably suspended. Opening at the bottom of the casing is a discharge port 7 for the crushed material. A stock box 8 is provided so as to protrude downward from the outside near the lowest end of the lower collision plate 6B so as to be movable forward and backward. FIG. 2 shows an enlarged view of this part, and the stock box has a vertical polygonal inclined surface 81.
(In this example, the upper part of the vertical plane is bent inward.)
and a horizontal surface 82 below it, and is rotatably suspended by the inner surface of the casing and a pin 83, and is connected via an adjustment screw 84 so that the distance A from the tip of the striking element 4 can be adjusted. Connected to the casing. The horizontal surface 82 of the stock box 8 becomes a state of dead stock as the crushed material S, which is scattered but thrown away, temporarily remains there.
This surface constantly crumbles and slides, and the particles rub against each other, scraping off the sharp parts of the particle surface and falling downward from the edge of the horizontal surface 82. At this time, the shortest distance B between the horizontal surface end and the rotating striker 4 is preferably B≧A, and the prior art seeks a tendency opposite to the principle generally observed in a plurality of normal collision plates. This is one of the major differences. In other words, normally it would be logical to set the shortest distance as small as possible for the lower collision plates to increase crushing efficiency, but since the stock box of the present invention is intended for particle size regulation rather than crushing, the collision plates The principles that apply to

FIG. 3 shows a second embodiment of the present invention, in which the input port 5 opens at the center above the rotor 3, and the main shaft 2 can rotate in both forward and reverse directions, one each symmetrically. Each collision plate 6 is suspended diagonally above the rotor 3. The configuration of the stock box 8 is the same as the previous example, but the difference is that two pieces protrude symmetrically within the casing. In the case of this embodiment, only the collision plate and the stock box on either the left or right side of the figure participate in the crushing work, and the other does not participate in the work, but if one of them wears out and the crushing capacity decreases, the main shaft It goes without saying that one can reverse the two and use the other.

0012

[Effects of the Invention] As described above, the horizontal impact crusher of the present invention improves not only the particle size distribution but also the surface smoothness in order to obtain the properties required when crushed materials such as aggregates are used as final products. It greatly improves fluidity and filling properties when mixed as a concrete slurry.

[0013] Furthermore, when crushing using only a collision plate as in the past, in order to obtain the desired particle size, a considerable amount of over-pulverization is often involved, and the material is determined to be unsuitable as an aggregate. Although the amount of material is large, when a sieve test (screening test) was performed, it was found that the 2.5 mm pass amount was reduced by 20 to 40% in the present invention compared to the conventional method. In addition, the actual rate (comparison of filling amount to the same volume) is about 1% compared to conventional
There was an increase in the grain shape, supporting the smoothing of the grain shape. In addition, unlike conventional collision plates, the surface of the stock box is covered with stationary debris and is protected by a type of self-lining, so there is less wear and there is less need for replacement. It has also been reported that the amount of wear on the impactor is relatively reduced and the current value required to operate the crusher is also reduced by about 9% compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention.

FIG. 2 is a detailed enlarged view of the main part of FIG. 1;

FIG. 3 is a longitudinal sectional front view showing another embodiment of the present invention.

[
FIG. 4 is a longitudinal sectional front view showing a conventional technique.

[Explanation of symbols]

1 Casing 2 Main shaft
3 Rotor 4 Striker 5 Inlet 6 Collision plate 7 Discharge port 8 Stock box 81 Inclined surface
82 Horizontal surface S Crushed object

Claims (4)

[Claims] Claim 1: A plurality of impactors are attached to the outer periphery of a rotor supported by a main shaft rotatably horizontally suspended in a casing, an inlet for crushed material is provided above, and at least one impactor is provided diagonally above the rotor. In a horizontal impact crusher in which a collision plate is tiltably suspended and a discharge port is provided below, the collision plate is formed of a vertically oriented inclined surface and a substantially horizontal surface downward from the outside near the lowest end. A horizontal impact crusher characterized by a protruding stock box that can move forward and backward. 2. In claim 1, where A is the shortest distance between the trajectory of the tip of the striker when it rotates and the collision plate, and B is the shortest distance between the trajectory and the stock box, B≧A.
A horizontal impact crusher characterized by: 3. The horizontal impact according to claim 1 or 2, characterized in that the input port for crushed material is provided diagonally above the casing, and one or more collision plates are suspended from diagonally above the rotor. Type crusher. 4. According to claim 1 or 2, the input port for crushed material is provided at the upper center of the casing, one or more collision plates are suspended obliquely from above symmetrically with respect to the rotor, and the stock box is inserted from the left and right sides. A horizontal impact crusher that protrudes evenly and has a main shaft that can rotate forward and backward.