JPH051309Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Fields This invention is designed to send ore to be crushed, such as rocks, fed from the center of a rotor that rotates at high speed, in a tangential direction from an outlet on the circumferential side of the rotor, and crush it onto the metal crushing surface around the rotor. The present invention relates to the above-mentioned rotor in a centrifugal crusher that crushes the crushed materials by colliding with a dead bed formed by crushed materials. Prior Art A rotor in a centrifugal crusher is usually provided with several outlets 1 on the circumferential side, as shown in FIG.
The material to be crushed is fed from the center and moved to the outlet by centrifugal force, and then blown away in a tangential direction.
The rotor is shattered by colliding with a metal crushing surface around the rotor or a dead bed, and in order to protect the rotor 3 from the fragments that bounce back after colliding with the crushing surface or the dead bed, the circumferential side of the rotor except for the outlet 1 is It is covered with a wear-resistant metal peripheral wall plate 4. Problems to be solved by the invention: The smaller the particle size of the crushed objects that fly out from the outlet 1 on the rotor's circumferential side, the more they are slowed down by air resistance.
The abrasion resistant material 5 near the outlet gradually wears out as the fine powder rubs against the relative movement drawing a trajectory as shown in the figure (the shaded area in the figure shows the worn part). When the wear of this part progresses to a certain extent, the wear spreads to the peripheral wall plate 4, and the wear starts from closer to the outlet. Therefore, it was necessary to periodically replace or repair the wear-resistant material 5 and the peripheral wall plate 4. The purpose of the present invention is to uniformly wear the surrounding wall plate, thereby preventing uneven wear and prolonging the repair interval of the surrounding wall plate. Means for Solving Problems In the rotor of the present invention, the center of curvature of the circumferential wall plate that covers the circumferential side of the rotor except for the outlet is eccentric from the center of the rotor, and the chip plate is bitten inward toward the outlet. It is characterized by being oriented in the tangential direction. Function The fine powder flying out from the outlet 12 is gradually decelerated due to air resistance, but as the peripheral wall plate 11 approaches the circumference around the axis of the rotor 13, as shown in FIG. Flows along the plate 11,
Contact is averaged in the circumferential direction without local contact. In addition, in FIG. 3, the tip plate 1
6 and the tangent h to the edge of the peripheral wall plate 11 is ±10°, the tangent and the tip plate 1
Compared to the case where α = 0, where the directions of 6 are the same, the amount of wear on the peripheral wall plate 11 reaches 5 times, and when the angle is ±5°, the wear amount is 1.5
It's doubled. The results are shown in the table below.

[Table] Example In the example shown in FIG. 1, the rotor 13 is provided with three outlets 12 at regular intervals, and the center of curvature of each peripheral wall plate 11 between the outlets is eccentric from the axis of the rotor 13. , is formed so as to bite inward toward the exit. A built-up layer 14 made of high chromium steel is formed on its outer surface. In the figure, 15 is a dead stock formed by accumulating small pieces of material to be crushed, and 16 is attached to a wear-resistant material 17 connected to the peripheral wall plate 11, facing in the tangential direction of the end of the peripheral wall plate 11. It is a chip plate. Next, an example will be given and explained. Example 1 Using the conventional rotor (1000mmφ) shown in Fig. 4, the wear amount of each part was measured after one month.
The wear amounts at points a, b, and c were 5 mm, 1 mm, and 0.5 mm, respectively. Example 2 Using the rotor shown in FIG. 1 in which the peripheral wall plate 11 (curvature radius 500 mm) between the outlets has an angle θ of 74° and the center of curvature o is eccentric by 32 mm from the axis o of the rotor 13,
When the amount of wear on each part was measured after a month, the amount of wear was uniform and was 0.5 mm. Effects of the invention As described above, in the rotor of the present invention, the center of curvature of the peripheral wall plate 11 that covers the circumferential side of the rotor except for the outlet is eccentric from the center of the rotor, and the tip plate 16 is bitten inward toward the outlet. This feature is characterized in that the peripheral wall plate is oriented in the tangential direction of the peripheral wall plate 11, so that local wear of the peripheral wall plate does not occur and the amount of wear is reduced, so that the repair interval of the peripheral wall plate can be extended.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the rotor according to the present invention, Figure 2 is a diagram showing the locus of objects to be crushed that fly out of the rotor, Figure 3 is a diagram showing the angle tangent to the rotor's tip plate, and Figure 4 is a diagram showing the trajectory of the crushed object flying out from the rotor. The figure is a sectional view of a conventional rotor, and FIG. 5 is a diagram showing the locus of the object to be crushed by the rotor shown in FIG. 4. 11... Peripheral wall plate, 12... Outlet, 13... Rotor, 16... Chip plate, 17... Wear-resistant material.

Claims (1)

[Scope of utility model registration request] The material to be crushed is fed from the center of the rotor that rotates at high speed, and is tangentially thrown from the outlet on the peripheral side of the rotor, onto the metal crushing surface around the rotor or into a dead bed formed by the crushed material. In a centrifugal crusher that crushes by colliding, the center of curvature of the peripheral wall plate 11 that covers the circumferential side of the rotor except for the outlet is eccentric from the center of the rotor, and the chip plate 16 is bitten inward toward the outlet. A rotor characterized in that it is oriented in the tangential direction of the rotor.