JPS6224131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a vertical crusher, and particularly to a vertical crusher that improves the classification performance of finely pulverized particles and improves the quality of pulverized products.

As shown in FIG. 1, a conventional vertical crusher has a plurality of crushing rollers 11 rotatably disposed on a rotary table 9 that rotates while maintaining a horizontal state, and objects to be crushed are placed on the rotary table 9. The material to be crushed is crushed by the rotation of the rotary table 9 and the crushing roller.The crushed particles are introduced from the air supply port 12, and are carried upward by the air flow rising through the gap 10. During the transportation, the large coarse particles in the fine particles fall due to their own weight.

The relatively large coarse particles further carried along with the airflow are repelled by the rotating repulsion blades 6' and are blown off from the airflow. The coarse powder thus fallen is pulverized again on the rotary table 9. On the other hand, the fine powder from which the large coarse powder is separated is transported to the fine powder outlet 1 along with the air flow.
3 as a pulverized product.

By the way, in the vertical crusher of the type shown in FIG. 1, the fineness of the pulverized product is determined by the performance of the rotary repulsion blade 6'. increase the number of
Efforts are being made to increase the number of rotations. However, increasing the number of rotating repulsion blades 6' or increasing the number of rotations increases the pressure loss of the air flow required to transport the particles, which increases the power required for pulverization as a whole. There were flaws. In addition, in this type of vertical crusher, the flow of large particles among the particles repelled by the rotating repulsion blades 6' becomes as shown by the dotted line in Figure 1, and a part of them rises again due to the rising air flow, causing the rotation As a result, the classification effect of the rotary repulsion blade 6' is reduced, and the performance of the vertical crusher is degraded. Therefore, it became necessary to increase the number of rotary repulsion blades 6' and increase the number of rotations, and the above-mentioned drawbacks became even more serious.

The present invention aims to provide a vertical crusher that solves the above-mentioned conventional drawbacks.

That is, in the present invention, a funnel-shaped chute is provided above the center of the rotary table, and this chute creates an upward flow path for the crushed particles on the outer surface of the chute (in this flow path, a relatively Large coarse particles fall down due to their own weight, which is the same as in the conventional method), and a variable fixed vane is provided at the upper end of the chute in this flow path for rectifying the air flow, and this variable fixed vane Rotating repulsion blades are provided concentrically at the same level on the fine powder outflow side of the chute, and the particles carried by the airflow are classified into two stages by the variable fixed blade and the rotary repulsion blade. A return flow path for the coarse powder classified by the variable fixed blades and the rotating repulsion blades to the pulverizing table is formed along the side surface, and a cylindrical rectifying cylinder is provided on the outer circumferential side of the rotary repulsion blades so as to be movable up and down. It is characterized by:

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a vertical crusher according to the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 9 denotes a rotary table, on which a plurality of crushing rollers 11 are rotatably mounted.
...is arranged. Above the center of the rotary table 9, a funnel-shaped chute 8 is suspended from the upper end of the casing 14 via a flange 16. A variable fixed blade 1 is provided between the upper edge of the funnel of this chute 8 and the upper end of the casing 14, and air introduced into the casing 14 from the air supply port 12 flows into the crushing chamber 16 through the gap 10. A flow path is formed so that the particles flow upward along the outer surface of the chute 8 together with the finely pulverized particles, and the flow direction is changed in the circumferential direction at the variable fixed blade 1 section.

As shown in FIG. 3, the variable fixed blades 1 are fixed to a shaft 2 in large numbers, and the upper end of the shaft 2 is fixed to a ring member 3. The ring member 3 is connected to a drive device 5 via a connecting member 4. It is connected.
Therefore, by driving the drive device 5 and rotating the ring member 3, the angles of the variable fixed blades 1 can be changed all at once.

In the figure, reference numeral 6 denotes a rotary repulsion blade, and in this embodiment, a large number of round rods (square rods, strip plates, etc. may also be used) are arranged vertically in a circular shape, and are arranged at the same level on the outflow side of the variable fixed blade 1. It is located concentrically and fixed to the hollow shaft 7, and is rotated together with the hollow shaft 7 via a V-belt 19 by a variable speed electric motor (not shown). The hollow shaft 7 is rotatably incorporated into the outer periphery of the material-to-be-pulverized supply tube 17 via a bearing 18 or the like. Also, 1 in the diagram
Reference numeral 5 denotes a cylindrical rectifying cylinder which is provided on the outer periphery of the rotary repulsion blade 6 and is movable up and down, which adjusts the flow path through which the air-borne fine particles flowing out of the variable fixed blade 1 flow into the rotary repulsion blade 6. It is. Note that 13 is a fine powder outlet.

Next, the operation of this embodiment configured as described above will be explained. The object to be crushed, supplied from the object supply cylinder 17, falls onto the rotary table 9 from the lower opening of the chute 8, and is crushed by the rotation of the rotary table 9 and the rotation of the crushing roller 11. The particles thus ground are carried upward by the air flow introduced through the air inlet 12 and flowing into the grinding chamber 16 through the gap 10. The particles transported in this manner are rectified and classified by the variable fixed blade 1, and the coarse powder naturally falls down the inner surface of the chute 8. The rectified particles then collide with the rotating rotary repulsion blades 6, and the coarse particles are brushed off and naturally fall down the inner surface of the chute 8, and only the fine particles flow through the gaps between the rotary repulsion blades 6. The inflow of particles into the rotary repulsion blades 6 is controlled by moving the straightening tube 15 up and down, adjusting the rotational speed of the rotary repulsion blades 6, and adjusting the angle of the variable fixed blades 1 to classify the variable fixed blades. Together with the effect, the classification effect of the rotating repulsion blades 6 is adjusted to be optimal. The coarse powder that has naturally fallen down the inner surface of the chute 8 as described above falls onto the rotary table 9 again and is pulverized. On the other hand, the fine powder that has passed through the rotating repulsion blade 6 on the airflow is transported to the fine powder outlet 1.
3, it flows out with air and is taken out as a pulverized product.

As described in detail above, according to the vertical crusher of the present invention, a funnel-shaped chute is provided above the center of the rotary table to provide an upward flow path for crushed particles and a return flow path for coarse powder after classification. A variable fixed vane is provided at the inlet of the funnel-shaped chute of this upward flow channel, and a rotary repulsion wing is provided concentrically at the same level on the air outflow side of this variable fixed wing. All of the particles that have been carried upward by the flow pass through the variable fixed blades and the rotating repulsion blades, and by adjusting the variable fixed blades, the inflow of particles into the rotating repulsion blades is controlled by the rotating repulsion blades. Since the classification effect is adjusted to be large, large coarse particles among the particles are efficiently classified. In addition, by classifying the powder twice using the variable fixed blade and the rotating repulsion blade, the mixing ratio of relatively large coarse powder is greatly reduced, making it possible to obtain a pulverized product with uniform particles. This has the excellent effect of greatly improving the quality of the product. Furthermore, in the vertical crusher of the present invention, by moving the rectifying tube up and down and adjusting the rotational speed of the rotary repulsion blades, the classification action of the rotary repulsion blades can be adjusted to the optimum one according to the pulverized material. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional vertical crusher, FIG. 2 is a vertical cross-sectional view of a vertical crusher according to the present invention, and FIG. 3 is a plan view of variable fixed blades in the vertical crusher of the present invention. be. 1...Variable fixed wing, 6...Rotating repulsion wing, 8...
Chute, 9...Rotary table, 11...Crushing roller, 12...Air inlet, 13...Fine powder outlet, 14
...Casing, 15...Rectifier cylinder.

Claims (1)

[Claims] 1. In a vertical crusher in which a plurality of crushing rollers are rotatably arranged on a rotary table, and the rotary table and crushing rollers are surrounded by a casing, a funnel-shaped chute is provided above the center of the rotary table. A fine powder outlet is provided above the air supply port, and air introduced from the air supply port flows along the outer surface of the chute together with the pulverized particles, enters the funnel-shaped chute, and reaches the fine powder outlet. A coarse powder flow path is formed on the inner surface of the funnel-shaped chute in which large particles among the particles return to the rotary table, and a flow of particles is formed at the air at the upper end of the chute in the fine powder flow path and at the inlet of the pulverized particles. A variable fixed blade is provided to rectify the flow, and a rotary repulsion blade is provided concentrically at the same level on the outflow side of the particles of the variable fixed blade, and a cylindrical rectifier cylinder is provided on the outer periphery of the rotary repulsion blade so as to be movable up and down. A vertical crusher characterized by being equipped with.