JPS5916496B2 - Vertical crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical crusher, and more particularly to an improvement in the rotary table of a vertical crusher.

As shown in FIG. 1, a plurality of crushing rollers 2 are rotatably arranged on a rotary table 1 that rotates while maintaining a horizontal state, raw materials are put on the rotary table 1, and the rotary table 1 and the crushing rollers 2 Vertical crushers that crush raw materials by rotation are well known.

By the way, in this vertical crusher, in order to increase the crushing efficiency, it is necessary to increase the size of the crushing roller 2 so that large raw materials can be bitten, and it is also necessary to widen the width of the crushing roller 2. In this case, it is necessary to increase the raw material passage gap 3 above the center of the rotary table 1 to increase the amount of raw material input to the rotary table 1.

For this reason, the rotation axis center line l of the crushing roller 2 is
The apex P of the conical surface on the outer periphery of the crushing roller 2 is not aligned with the center point o of the rotation axis on the rotary table 1. Therefore, the rotary table 1 at the contact position between the rotary table 1 and the crushing roller 2
Since the speed of the rotary table 1 and the speed of the crushing roller 2 differ in the tangential direction of the rotary table 1, relative slippage between the rotary table 1 and the crushing roller 2 occurs. That is, assuming that the speeds of the rotary table 1 and the crushing roller 2 are equal at 2, lm/s at the center a of the contact width M of the crushing roller 2 on the rotary table 1 as shown in FIG. The speed in the direction is shown by the solid line A, and the speed at the contact width M of the grinding roller 2 with the rotary table 1 is shown by the broken line. There is a large difference between the circumferential speeds of points 1a and lb on the rotary table 1 soil where the outer ends 2a and 2b are located, and the crushing roller 2 on the rotary table 1
Due to the differential speed in the contact width M, a relative slip s between the rotary table 1 and the crushing roller 2 occurs in the tangential direction of the table rotation. As a result, as shown in FIG. 3, the rotary table 1 and the crushing roller 2 are unevenly worn, and as this uneven wear progresses, the amount of raw material to be crushed is significantly reduced, and the amount of raw material circulating within the crusher is increased. In other words, when the unpulverized raw material is conveyed to the upper part of the crusher by air along with the fine powder released from the top of the rotary table 1 to the outer periphery, the unpulverized raw material is separated by the fixed blades 4 shown in FIG. Only the unpulverized raw material is transferred from the fine powder outlet 5 at the upper end, and the unpulverized raw material that has fallen is repeatedly thrown onto the rotary table 1 together with the raw material supplied from the raw material supply port 6. As a result, the grinding efficiency decreases and the power consumption for driving the grinder increases. Furthermore, since the raw material is pulverized in an unstable state due to uneven wear, vibration and noise are high, and the usage rate of the rotary table 1 and the pulverizing roller 2 is low. The present invention was made to eliminate the drawbacks of the conventional vertical crusher, and reduces the relative slippage between the rotary table and the crushing rollers to a dog's width, thereby reducing and uniformly wearing out the rotary table and the crushing rollers. It is an object of the present invention to provide a vertical crusher that is designed to wear out. Hereinafter, an embodiment of the vertical crusher according to the present invention will be explained with reference to FIGS. 4 to 6. A plurality of crushing rollers 2 (three in this example) are rotatably disposed on a rotary table 1, and the crushing rollers 2 are arranged so that the apex P of the conical surface on the outer periphery is the center point 0 of the rotation axis on the rotary table 1. The material passing gap 3 is made large and wide without matching, and has a sufficient raw material passage gap 3 above the center of the rotary table 1.
has been taken.

However, a flat circular hole 7 is provided in the circumferential direction of the upper surface of the rotary table 1.
A disk 8 is rotatably fitted into each circular hole 7 so as to be flush with the top surface of the table 1.

The rotatable disk 8 may be provided with grade 9 discontinuously perforated equiangularly and radially as shown in the figure. In this case, the bottom of the flat circular hole 7 is provided with a discharge passage 10 for the pulverized fine powder as shown in the figure. is provided, and its tip is opened on the outer peripheral surface of the table 1.

Six rotatable disks 8 are disposed circumferentially on the rotary table 1, but the present invention is not limited to this.

Further, the discharge passage 10 for grade 9 and crushed fine powder is not limited to the shape shown in the drawings.According to the vertical crusher of the present invention configured as above, the discharge passage 10 is supplied from the raw material supply port 6, and the raw material passage gap 3 is The raw material thrown onto the rotary table 1 is then crushed by the rotation of the rotary table 1 and the crushing roller 2.

At this time, since the apex P of the conical surface on the outer periphery of the crushing roller 2 is not aligned with the rotation axis center point 0 on the rotary table 1, the contact width M of the crushing roller 2 on the rotary table 1 is shown in FIG.
} There is a large difference between the speed of the rotary table 1 and the speed of the crushing roller 2, but since the disk 8 on the rotary table 1 rotates by this difference in speed, the speed of the rotary table 1 and the crushing roller 2 are The relative slope S shown in FIG. 2 is significantly reduced. As a result, the wear of the rotary table 1, the disc 8, and the crushing roller 2 due to raw material crushing is reduced, and the relative engagement positions of the rotary table 1 and the crushing roller 2 change, so that the wear is almost uniform as shown in FIG. do. Therefore, the amount of raw material pulverized does not decrease as wear progresses, the amount of raw material circulated within the pulverizer does not increase, and the pulverization efficiency is kept constant.
There is no increase in power consumption for driving the crusher. In addition, as mentioned above, the rotary table 1 and the grinding roller 2 are worn almost uniformly, so the raw material is ground in a stable state, with low vibration and noise.
Moreover, the rotary table 1 and the crushing roller 2 are used frequently. In particular, when the disc 8 on the rotary table 1 is provided with grades 9 discontinuously radially as shown in the figure, and the fine powder discharge passage 10 is provided below the disc 8, the rotary table 1 and the crushing roller 2 Since the fine powder pulverized by the rotation falls below grade 9, over-pulverization is prevented.

The fine powder that has fallen from grade 9 is discharged to the outer periphery of the rotary table 1 through the discharge passage 10, where the fine powder and fine powder are discharged from the top of the rotary table 1 to the outer periphery by the air sucked in from below. The unpulverized raw material is transported to the upper part of the crusher together with a small amount of unpulverized raw material, and the unpulverized raw material is separated by the fixed blades 4 and falls, and only the fine powder is transferred from the fine powder outlet 11 at the upper end. The fallen unpulverized raw material is thrown onto the rotary table 1 again together with the raw material supplied from the raw material supply port 6. Thus, the circulating amount of raw material in the crusher is significantly reduced, the crushing efficiency is significantly increased, and the power consumption of driving the crusher is significantly reduced.As detailed above, according to the vertical crusher according to the present invention , the relative slip between the rotary table and the crushing roller can be greatly reduced, so the wear of the rotary table and the crushing roller due to raw material crushing is reduced, and the relative biting position of the raw material between the rotary table and the crushing roller changes, so the rotary table The grinding roller wears out almost uniformly.

Therefore, the pulverization quantity of the raw material does not decrease due to the progress of wear, the pulverization efficiency increases, and the power consumption for driving the pulverizer decreases. In addition, since the rotary table and the crushing roller do not wear unevenly, the rotary table and the crushing roller can be used at a high rate, and there are excellent effects such as low vibration and noise during driving.

[Brief explanation of the drawing]

Figure 1 is a partially longitudinal front view of a conventional vertical crusher, Figure 2 is an explanatory diagram of the rotary table and crushing rollers facing each other in the vertical crusher, and Figure 3 is the rotary table and crusher. FIG. 4 is a partially enlarged cross-sectional view showing the state of uneven wear due to the rollers facing each other; FIG. 4 is a partially vertical front view of the vertical crusher according to the present invention;
5 is an enlarged sectional view of section A in FIG. 4, and FIG. 6 is a plan view of the rotary table shown in FIG. 5. 1...Rotary table, 2...Crushing roller, 3...Raw material passage gap, 4...Rotary blade, 5...Fine powder outlet , 6... Raw material supply port, 7... Flat circular hole, 8... Disk,
9...Grade, 10...Discharge passage.

Claims (1)

[Claims] 1. In a vertical crusher in which a plurality of crushing rollers are rotatably arranged on a horizontal rotary table, a rotatable disk is disposed in the circumferential direction of the top surface of the rotary table. A vertical crusher characterized by being arranged flush. 2. The vertical pulverizer according to claim 1, characterized in that a rotatable disc is provided with a grade, and a discharge passage for pulverized fine powder is provided below the grade.