JP2557183Y2 - Impact crusher rotor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a technique for extending the life of a rotor of an impact crusher.

[0002]

2. Description of the Related Art In order to crush rock and use it as aggregate for concrete structures or aggregate for roads, it is usually necessary to use a primary or secondary crusher such as a jaw crusher or a cone crusher until the desired particle size is reached. It is crushed and commercialized by an impact crusher as a final tertiary crush. This impact-type crusher also has various shapes, but generally employs a configuration as shown in FIG. In other words, the rotor main shaft 2a is suspended in the casing 1a and connected to an external drive source (not shown) to rotate at high speed. A number of rotor disks 3a are externally fitted in parallel on the rotor main shaft 2a, and the outer peripheral surface of the rotor disk is divided equally to radiate a plurality of hitters 4a.
Attach. In the case of this prior art, a charging port 5a for the crushed material M is provided at the upper center of the casing 1a, and the crushed material is charged toward a rotor disk rotating at a high speed immediately below.
The crushed object collides with a striker on the outer periphery of the rotor disk and is repelled, and is repelled by a repulsion plate 6a suspended obliquely upward.
Again, and undergoes an efficient crushing action in the process of moving between the striker and the repulsion plate to be refined. In the case of this prior art, the repulsion plates 6a are arranged symmetrically in two stages, and when one of the repulsion plates is worn, the rotation direction of the rotor main shaft is reversed, and the rotor is switched to the other repulsion plate to continue crushing. However, of course, there is often seen a configuration in which one repulsion plate is suspended on one side only, or two upper and lower resilient plates are supported, and the inlet for the crushed material is opened obliquely upward.

[0003]

In either case, the outer periphery of the rotor disk fitted to the rotor main shaft is divided equally and the striking elements are attached radially, and a large number of rotors are aimed at rotating at high speed. The crushed material still falls. The problem here is the premature wear of the rotor disk. The rotor disk is usually
Two polygonal steel plates (usually a large number of squares) are arranged in parallel at a desired distance from each other, and formed by welding with a spacer interposed therebetween. There is no problem since a hitter attachment portion is provided in each outer corner and a hitter made of a special alloy casting having wear resistance and impact resistance is attached. However, despite the fact that the upper part of each outer edge constantly collides with the falling crushed material, since this part is formed of a general steel plate as described above, if it remains exposed, it immediately wears and returns to its original state. Since the shape is lost, a wear-resistant material (for example, high manganese cast steel) is placed on the outer side 33a of the rotor disk 3a.
The protector 35a manufactured in the above is covered to prevent early wear of this portion.

FIGS. 4A and 4B are partial front views of a rotor for explaining the problems of the prior art. As shown in the figure, the main body of the rotor disk 3a is often formed of a polygonal steel plate 31a. The reason for this is that the most efficient use of the material is mainly made of a square or a polygon when the sheet is cut from a steel sheet material. In the prior art, a protector 35a having a linear upper surface along the outer side is covered to protect the exposed outer side 33a of the rotor disk from wear. Now, if a circular arc of a locus drawn by the tip of the striker 4a rotating at a high speed while being held by the rotor disk is indicated by a curve S, a part of the upper surface of the protector 35a farthest from the curve S is a central portion 36a.
The closest is the end 37a adjacent to the attachment of the striker. Since the protector also rotates at a high speed together with the rotor disk, when the crushed object falls from the upper part, the end 37a farthest from the axis is most likely to collide with the crushed object on the upper surface of the protector, The lower part is the center 36a near the axis. When this difference in the chance of collision is repeated, the wear effect due to the rubbing with the crushed material concentrates only on the end portion 37a as shown in FIG. As a result, the protector coated on the rotor disk has to be replaced even if the other part is in good condition due to a very small part of uneven wear. Had one. The polygonal shape shown in the figure
The method of attaching the striker to the corner of the
Most of the conventional technology
All art has one weakness in this regard. For example
Japanese Patent Application Laid-Open No. Sho 62-114666 discloses a hitter after wear.
Is proposed to easily replace the
Protector that covers the outer periphery of the target disk (in this case,
Wear and replacement of the rotor)
As for Fig. 4, uneven wear similar to Fig. 4 and replacement with restriction
Is expected and is left as an issue.

[0005] There are various types of crushers and crushers.
To protect the main parts of each device from external adverse conditions
Has a wide variety of configurations. For example, FIG.
In 3-95361, a wet crushed material such as lignite is used.
Supply it to the ventilation tube together with the high-temperature gas, and
Ventilation hank that crushes and sends it to the boiler through the suction cylinder
Because it is intended for mark crushers, especially shafts
Protecting parts from high temperatures is an important maintenance condition. So
A large number of grooves in the shaft 2b for the swelling surface
101, and from the swelling surface to the outer periphery with a gap
When the outer cover 102 surrounds, a shape is formed between the shaft bulging surface and the outer cover.
The air in the formed annular space becomes the heat insulation layer,
Cooling function to protect the shaft from external heat entering
It claims to be effective. However, this conventional technology is
Since the jacket part was configured to secure the passage of the medium
Therefore, uneven wear of the main part of the device
Needless to say, this is an unrelated technology. In order to solve this problem, an object of the present invention is to provide a structure for preventing uneven wear of a protector covering a rotor disk.

[0006]

The rotor of the impact-type crusher according to the present invention comprises two polygonal steel plates 31 connected in parallel to a rotor main shaft 2 rotatably supported in a casing 1.
The rotor disk 3 is fitted over the rotor disk 3
For fitting the striker 4 to each polygonal corner of
Forming an attachment portion 32 and an outer edge connecting the corners.
In the rotor of the impact crusher in which the wear-resistant protector is coated upward , the protector 35 has an L-shaped cross section,
The outer peripheral surface covering the outer periphery 33 of the rotor disk is the outer periphery
An arc surface 3 connecting the 33 end points and concentric with the rotor spindle 2
4 and is detachably mounted on the side of the rotor disk 3.
The above-mentioned subject was solved by wearing .

[0007]

The outer periphery of the polygonal steel plate 31 forming the rotor disk is a straight line, but the outer peripheral surface of the protector that covers the outer periphery is formed by an arc having a constant radius of curvature that does not change the mounting portion or the center. Therefore, the distance of the tip of the striker from the rotating locus (curve S) is the same everywhere, and the chance of the crushed object colliding with the outer peripheral surface of the protector is all equal. Therefore, the wear of the outer peripheral surface also progresses uniformly and is leveled over the entire surface, so that the service life of each protector is surely extended as compared with the conventional case. Moreover, the protector
The cross section is L-shaped and can be attached and detached to the side of the rotor disk
Because it is freely mounted, what is exchange due to wear of the striker
Separately, it can be easily replaced by itself,
In terms of maintenance, it is also the starting point for maintaining convenient superiority.
You.

[0008]

FIG. 1 is a front view of an embodiment of the present invention. This example is a state-of-the-art impact type crusher, in which a rotor main shaft 2 is suspended in a casing 1 and a plurality of rotor disks 3 are fitted on the outer peripheral surface thereof to rotate at high speed. An inlet 5 for the material to be crushed is opened at the center of the casing, and a reciprocating plate 6 of two upper and lower stages is slidably supported symmetrically with respect to the rotor main shaft. In this example, a sizing plate 7 is provided below the lower repulsion plate to add a sizing effect to remove the sharp angle of the crushed object, and the highest quality as an aggregate not only in the particle size distribution of the product but also in the particle shape. Is provided.

The rotor disk 3 has a welded structure in which two polygonal steel plates 31 are connected in parallel at a predetermined distance from each other, and a mounting portion 32 for mounting the striker 4 is provided at a square corner portion. Outer side 3 connecting parts
3 is covered with a protector 35. FIG. 2 (A)
(B) is a front view and a side view of only the protector 35,
Since the outer peripheral surface is formed with the entire length by the arc surface 34,
Both the central portion 36 and the end portion 37 have the same radius of curvature without changing the distance from the axis. The cross section of the protector is L
Bolt holes 38 for fastening bolts to the side surface of the rotor disk are formed at three places in the shape of a letter, and each is fitted on the outer peripheral surface of one polygonal steel plate 31 to protect the outer peripheral surface.

As for the protector material, high manganese steel is most desirable as before, but other high chromium cast iron and Ni
-Various wear-resistant materials such as a heat-treated material of a low alloy steel containing Cr-Mo can be selected and used.

[0011]

As described above, according to the present invention, the wear of the protector is leveled and progresses uniformly over the entire surface, so that the life of the protector is significantly longer than before under the same wear conditions. Therefore, the opportunity to stop the impact crusher for replacing the protector is significantly reduced, and the effect of greatly contributing to the improvement of productivity is obtained. In addition,
In addition to the durability of the data itself, finally update for wear
If it does, the replacement work is extremely easy.
In this respect, the advantages over many other conventional technologies are
Points are obtained.

[Brief description of the drawings]

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

FIG. 2 is a front view (A) and a side view (B) of only the protector of the same embodiment.

FIG. 3 is a front view of the prior art.

FIGS. 4A and 4B are partial front views showing the problems of the prior art by FIGS.

FIG. 5 It is another longitudinal front view of a prior art.

Claims (1)

(57) [Scope of request for utility model registration] 1. A polygonal steel plate 31 is connected in parallel to a rotor main shaft 2 rotatably supported in a casing 1.
The rotor disk 3 is fitted over the rotor disk 3
For fitting the striker 4 to each polygonal corner of
Forming an attachment portion 32 and an outer edge connecting the corners.
In the rotor of the impact crusher in which the wear-resistant protector is coated upward , the protector 35 has an L-shaped cross section,
The outer peripheral surface covering the outer periphery 33 of the rotor disk is the outer periphery
An arc surface 3 connecting the 33 end points and concentric with the rotor spindle 2
4 and is detachably mounted on the side of the rotor disk 3.
A rotor of an impact crusher, characterized by being worn .