JPH0429418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an impact crusher used for crushing raw ore.

"Prior Art" An impact crusher is constructed as shown in a sectional view of the main parts shown in FIG. Therefore, the raw ore introduced into the crushing chamber 2 from the raw ore supply port 1 installed at the upper side of the impact crusher collides with the striker 3 provided around the rotating rotor 4. The rough stones thrown off by this collision are crushed by the liner 6a attached to the first repulsion plate 6 provided at the top of the crushing chamber 2, and the rough stones thrown back are further rotated and crushed. It is crushed by impact by the next striking element 3. The thrown ore is crushed into finer pieces by a liner 7a attached to a second repulsion plate 7 provided at the top of the crushing chamber 2. The rough stone further advances from the next striker 3 to the liner 8a, and in this way, the rough stone is crushed through the path shown by arrow A.

Such a conventional striker 3 or repulsion plate liner 6
A and 7a are generally made of metal such as high chromium cast iron or high manganese steel.

``Problems to be solved by the invention'' However, since the injected ore is always caught at the tip of the striker, metal strikers and liners wear out as shown in Figure 5. When the amount exceeds a certain value, the sliding between the crushed material and the striking object becomes severe, the crushed particle size becomes coarser, and the shape of the crushed material becomes more angular, resulting in a significant decrease in crushing ability. At this time, the striker was turned upside down and used with the new side facing up.

Various inventions and inventions have been made regarding the shape and mounting device of the striking element so that the striking element can be used multiple times by inverting the striking element vertically, rotating it, using both sides, or rotating the rotating rotor in the opposite direction. is being done. For example, Utility Model No. 59-131239,
There are those shown in each publication of No. 59-36275 and Japanese Patent Application Laid-open No. 59-24860.

However, since all of these use metal striking elements and repulsion plates, no fundamental solution has been made to reduce the amount of wear.

Furthermore, if the crushing efficiency is improved, it becomes possible to crush a large amount of raw ore, and the crushing ratio can be increased. To achieve this, it is necessary to increase the number of revolutions of the rotating rotor and increase the circumferential speed of the striker in order to obtain a product with even finer grain size by introducing large ores. In such a case, the impactor and repulsion plate are subject to severe wear, so there is a problem in that the conventional impactor and repulsion plate have a limited crushing ability.

"Purpose of the Invention" In order to solve the above-mentioned problems, the present invention aims to efficiently perform crushing processing even when the supply amount of rough stones is increased and when the circumferential speed of the rotating rotor is increased. The purpose of the present invention is to provide an impact type crusher equipped with a striking element that can perform the following.

"Means for Solving the Problems" In order to achieve the above object, the present invention is provided with a rotating rotor having a plurality of striking elements, and a repelling element provided near the rotating rotor and the striking In an impact-type crusher that crushes raw stones by colliding with them, ceramics with a hardness greater than the average hardness of the raw stones and whose edges have been cut off are used at the ends of the striking part of the striking element and/or repellent element that the raw stones collide with. and/or mechanically attached.

``Operation'' With the structure described above, this collision type crusher can be used even when the size of the rough stone is increased, when the supply amount of rough stone is increased, and when the circumferential speed of the rotor is increased. However, there is almost no wear on the striking element.

``Example'' Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 4 to provide an understanding of the invention. The following examples are merely specific examples of the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a cross-sectional view of a main part of a crusher according to an embodiment of the present invention in which the striking element side has been improved, and FIGS. 2 a, b, and c show a striking element that can be used in this embodiment. 3 is a cross-sectional view of a striking element in which ceramics made of various materials are bonded and/or mechanically attached to the end of the striking element, and a list diagram showing the state of damage to the striking element when the shape of the striking element is changed; FIG. 4 is a graph showing the wear resistance ratio of the striking element.

As shown in Fig. 1, the shape of the impact type crusher of this example is similar to that used conventionally, but the material of the impactor used and the shape of the outer edge are different. It is something to do.

As shown in FIGS. 2a, b, and c, the striking element 3 has a main body 9 made of metal, an outer end 10 (striking part) made of ceramic, and bonded and/or mechanically attached to the basic body 9. It is. 2a, the ceramic outer end 10 is joined to the main body 9 by adhesion, fusion welding, etc., and FIGS. 2b and 2c have the ceramic outer end 10 is sandwiched and fixed by bolts 12 between a restraining member 9' having a tapered side surface and the main body 9.

In investigating the suitability of ceramic properties when ceramic is used for the outer end 10, three typical types of ceramics, zirconia, silicon nitride, and alumina, were selected and each was sintered under pressure. (N is shown in Figure 3),
and those treated with a hot isostatic presser after pressureless sintering (indicated by H in FIG. 3) were selected for investigation.

Regarding the shape, 1mm and 2mm at the end 11.
A 45° chamfer and an arc-shaped chamfer with a radius of 2 mm were adopted. FIG. 3 shows how a striking element is damaged when a striking element in which these ceramics are bonded and/or mechanically attached to the main body 9 is used. The rough stone supplied at this time was rhyolite, which has the highest abrasiveness, and its Bitkers hardness is 1050 kg/
It was warm in ^mm2 . Additionally, the circumferential speed of the striking element has been increased to 45 m/sec, which is nearly double that of the conventional model. As is clear from FIG. 3, when chamfering of at least 1C is performed, the strength of zirconia-based and silicon nitride-based ceramics is slightly improved compared to when there is no chamfering at all. And further chamfer 2C (2
mm), the strength of all ceramics increased significantly, and corner cracking occurred only in alumina-based ceramics sintered under pressure. In addition, if the chamfer is R-chamfered, corner cracking will disappear even for the above-mentioned alumina-based products sintered under pressure, and those without chamfering or 1C
It is easily understood that the strength is dramatically improved compared to the one with a certain degree of chamfering.

Figure 4 is a chart showing the wear resistance ratio of striking elements made of various materials. Taking the wear resistance of cast iron as 1, the wear resistance of each ceramic and high manganese steel is the average of N, which is as pressureless sintered, and H, which is hot isostatically pressed after pressureless sintering. The vertical axis represents the Vickers hardness, and the horizontal axis represents the Vickers hardness. This shows that when using a hammer with the edges of ceramic harder than the average hardness of the raw stone cut off, it is possible to obtain more than 20 times the abrasion resistance compared to conventional crushing conditions, even when the crushing conditions exceed conventional crushing conditions. Ta.

Similar results can be obtained using the mechanically restrained striker of FIG. 2b or c.

"Effects of the Invention" As explained above, the present invention includes a rotating rotor having a plurality of impactors, and crushes the input raw stone by colliding with the repellent and the impactors provided near the rotating rotor. In an impact type crusher, a ceramic having a hardness greater than the average hardness of the rough stone and whose edges have been cut is bonded and/or mechanically bonded to the end of the striking part of the striking element and/or repellent element that the rough stone collides with. Since this is an impact type crusher that is installed with restraints, the efficiency of crushing raw ore is improved, and since this efficiency can be kept constant, the power consumption during crushing operation remains constant, making it possible to improve the crushing efficiency of raw ore. The power ratio per product is significantly reduced compared to the previous model. In addition, the impactor does not need to be turned upside down or replaced front and back as often as in the past, and can be used continuously for a long period of time, which provides excellent effects such as extremely easy operation management of the crusher.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing a crusher according to an embodiment of the present invention, FIGS. 2 a, b, and c are cross-sectional views of a crusher in this embodiment, and FIG. A list diagram showing the state of damage to the striking element depending on the shape of the outer edge of the striking element joined to the outer end, No. 4
The figure is a graph showing the wear resistance ratio of the striking element, and FIG. 5 is a cross-sectional view showing the wear status of the conventional striking element. (Explanation of symbols), 1... Rough supply port, 2... Crushing chamber, 3... Striker, 4... Rotor, 6... First
Repulsion plate, 6a... Liner, 7... Second repulsion plate, 7
a... liner, 8... casing, 8a... liner, 10... outer end.

Claims (1)

[Scope of Claims] 1. An impact type crusher that is equipped with a rotary rotor having a plurality of impactors and crushes raw ore by colliding it with a repulsion element provided near the rotating rotor and the impactor, which crushes the raw ore. A ceramic having a hardness greater than the average hardness of the raw stone and having its edges cut off is attached by bonding and/or mechanical restraint to the end of the striking part of the striking element and/or repelling element that collides with the stone. Impact type crusher. 2. The impact crusher according to claim 1, wherein the outer edge of the impactor is cut off with a 45° chamfer of 2 mm or more. 3. The impact crusher according to claim 1, wherein the outer edge of the impactor is cut off with an R chamfer with a radius of 2 mm or more.