JPH0461691B2 - - Google Patents

Description

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

"Prior Art" An impact crusher is constructed as shown in a sectional view of the main part shown in FIG. Therefore, the raw stone fed into the crushing chamber 2 from the raw material supply port 1 installed at the upper side of the impact crusher is transferred to the rotor shaft 5 installed horizontally.
The impact collides with the striker 3 provided around the rotating rotor 4, which rotates around the rotor 4. The rough stones that were blown away by this collision were removed from the first
The raw stone that is collided with and crushed by the liner 6a attached to the repulsion plate 6 and bounced back is crushed by impact by the next batter 3 that rotates further.
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 raw stone is further transferred from the next striker 3 to the liner 8 attached to the casing 8.
Proceeding to step a, the rough stone is thus crushed through the path shown by arrow A.

However, since the injected rough stone is always caught at the tip of the striker, the metal striker 3 wears out as shown by the solid line in Figure 5, and when the amount of wear exceeds a certain value, it becomes crushed and struck. The sliding between objects will become more intense, the crushed particles will become coarser, and the shape of the crushed pieces will become more angular, which will significantly reduce the crushing ability. It was used with the 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 examples such as those shown in Japanese Patent Publications No. 59-36275 and Japanese Patent Publication No. 59-24860.

"Problems to be Solved by the Invention" However, all of these anti-wear measures aim to extend the life of the striking element by changing the mounting position of the striking element; No measures were taken to prevent wear by increasing the usage time.

Therefore, the work of changing the mounting position of the striker cannot be omitted, resulting in poor workability.

``Object of the Invention'' The present invention has been made in order to eliminate the drawbacks of the conventional hammer, and has a shape that can suppress the occurrence of chips and cracks due to collision with rough stones, so that the collision part is resistant. An object of the present invention is to provide a striking element for an impact type crusher that can reduce wear caused by crushing raw ore by making it possible to use a high hardness material with excellent abrasion resistance.

"Means for Solving the Problems" In order to achieve the above object, the main means employed by the present invention is to provide a rotating rotor having a plurality of striking elements, and to place the loaded ore near the rotating rotor. In the impact type crusher's impact crusher that crushes the repellent by colliding with the impactor, the impactor is fixed in two parts to a base member attached around the rotating rotor and an end of the base member. and an outer end member that is arranged to collide with the rough stone, and the outer end member is made of a cemented carbide whose material is different from that of the base member, and the outer edge thereof is 2 mm or more. This is a striker for an impact crusher, which has chamfered or rounded corners.

"Operation of the Invention" With the above structure, the present invention can be used even when the size of the rough stone is increased, when the supply amount of the rough stone is increased, and when the circumferential speed of the rotor is increased. Also, 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 to 3 to provide an understanding of the present 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, FIGS. 1a, b, and c are cross-sectional views of a striking element of an impact crusher according to an embodiment of the present invention, FIG. 2 is a list diagram showing the damage status of various types of striking elements, and FIG. It is a graph showing the wear resistance ratio of these various types of striking elements.

The striker 3a shown in FIG. 1a is made of a general metal and is attached around a rotating rotor 4. The outer end member 10a, which is divided into two parts, is attached to the end of a base member 9a, which is attached around a rotating rotor 4, by gluing or bonding. They are joined by fusion welding or the like. Here, the outer end member 10a
is made of a cemented carbide such as tungsten carbide (WC), and the outer edge 11 of the outer end member 10a is cut with a 45° chamfer C2 of 2 mm.
That is, by providing the chamfered corners as described above to avoid stress concentration, it is possible to use cemented carbide, which is a high hardness material with low toughness and excellent wear resistance, as the outer end member 10a. .

Further, the striker 3b shown in FIG. 1b is made of a superalloy such as tungsten carbide at the end of a base member 9b made of a general metal, similar to the striker 3a shown in FIG. 1a. and the outer edge 1 is C2
The outer end member 10b cut out in step 1 is fixedly installed, but it differs from the striker 3a in that the method of fixing the outer end member 10b to the base member 9b is by mechanical restraint means.

That is, by providing a stepped surface 13 on the joint surface between the outer end member 10b and the base member 9b and inclining the inner surface 14 of the outer end member 10b, the outer end member 10
A restraining member 9' configured to pinch b is fixed with a bolt 12 passing through the base member 9b.

Therefore, the outer end member 10b is joined to the base member 9b by these stepped surfaces 13 and inner surfaces 14, and does not come off outward.

The striker 3c shown in FIG. 1c has an outer end member 10c attached to the base member 9c by mechanical restraint means, similar to the striker 3b shown in FIG. After the end member 10c is bonded 15 to a bonding member 16 made of a general metal by adhesion or fusion welding, this bonding member 16 is attached to the striker 3b.
It is fixed to the base member 9c in the same manner.

On the other hand, in determining the shape and dimensions of the chamfered portions of the outer edge portions 11 of the outer end members 10a, 10b, 10c,
The following research tests were conducted.

First, the toughness and hardness of the cemented carbide used as the material for the outer end members 10a, 10b, and 10c change depending on the content of cobalt (Co), and five types of cemented carbide with typical compositions are used. sample,,
, , was tested.

In addition, regarding the shape and dimensions of the chamfer on the outer edge, there are cases where there is no chamfer at all, 1 mm and 2 mm.
(Chamfer dimension) chamfered at 45° (chamfer angle) C1 and C2, and R2 with an arc-shaped round corner with a corner radius of 2 mm were adopted.

FIG. 2 shows how the striker was damaged when the striker equipped with these outer end members was used. The bending strength here is based on a three-point bending test specified in JIS R1601. The raw stone supplied at this time was the most abrasive ripple rock, and its Bitskers hardness was
It was 1050Kgf/ ^mm2 . Additionally, the circumferential speed of the striking element was set to 60 m/sec, which is nearly double that of the conventional model. As is clear from FIG. 2, when a 45° chamfer C1 of at least 1 mm is performed, damage such as cracking or chipping occurs less frequently than when no chamfering is performed at all. Then, when the 45° chamfer C2 was further increased to 2 mm, there were no corner cracks, and only the samples with the maximum hardness (minimum bending strength) had corner cracks. It is easy to understand that the strength is dramatically improved compared to those with no chamfering at all or with chamfers of about 1 mm.

Figure 3 is a chart showing the wear resistance ratio of striking elements made of various materials. A comparison of cemented carbide samples, with the wear resistance of cast iron (27Cr) as 1, and the wear resistance of high manganese steel (13Mn) on the vertical axis, and Bitkers hardness on the horizontal axis. It is. As a result, when using a hammer with the outer edge of the cemented carbide harder than the average hardness of the rough stone cut out, even when the crushing conditions are significantly higher than the conventional crushing conditions, the other parts of the sample are 15 times or more than 300 times the conventional crushing conditions. It was found that similar wear resistance was obtained.

Similar results can be obtained using the mechanically constrained strikers of FIGS. 1b or 1c.

"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. A striker for an impact crusher includes a base member to which the striker is attached around the rotating rotor, and an outer end member that is fixed in two parts to the end of the base member and collides with the raw ore. The outer end member is made of a cemented carbide whose material is different from that of the base member, and the outer edge thereof has a chamfered corner or a round corner of 2 mm or more. Because it is a blower for an impact type crusher, the efficiency of crushing raw ore is improved, and since this efficiency can be kept constant, the power consumption during crushing operation is constant, and the amount of power consumed per product is lower than before. The power ratio is significantly reduced. 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]

Figures 1a, b, and c are cross-sectional views of the impact crusher of an impact crusher according to an embodiment of the present invention, Figure 2 is a list showing the damage status of various types of impactors, and Figure 3 is a diagram showing the damage status of various types of impact crushers. FIG. 4 is a graph showing the wear resistance ratio of the striking element, FIG. 4 is a cross-sectional view of a main part of an impact crusher, and FIG. 5 is a cross-sectional view showing the state of wear of a conventional striking element. Explanation of symbols, 3a, 3b, 3c...Blower, 9
a, 9b, 9c...base member, 9'...restriction member,
10a, 10b, 10c... Outer end member, 11...
Outer edge portion, 12... Bolt, 16... Joining member.

Claims (1)

[Scope of Claims] 1. A striker of an impact crusher, which is equipped with a rotating rotor having a plurality of strikers, and crushes the input raw ore by colliding with the striker and a repellent provided in the vicinity of the rotating rotor. The striker is configured to have a base member attached around the rotating rotor and an outer end member that is fixedly attached to the end of the base member in a two-piece state and collides with the raw stone, A striker of an impact type crusher, characterized in that the outer end member is made of a cemented carbide whose material is different from that of the base member, and the outer edge thereof has a chamfered corner or a round corner of 2 mm or more. .