JPS6064643A - Vertical mill with rotary classifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical mill with a rotary shaker for pulverizing cement 1 and raw materials.

A conventional press mill has a structure as shown in FIG. 1, for example.

In FIG. 1, a is a casing, bu. A rotary classifier having blades, C is a crushing table of the powder tower 1, d is a crushing roller of the crusher, e is a coarse powder guiding cone, and f is a co-feeding chute for crushed materials. In other words, in the conventional vertical mill or mill shown in Fig. 1, as shown by the arrow g, rotational classification {》) b
As the path of the rising gas to the classifier B is repeatedly reversed, the pressure drop increases and the entire rotation width of the classifier B is effectively utilized:
Then, some of the two-layer gas flow passes through the short-circuit path inside the coarse powder-cum-inner circle ζ1 [body e and prevents the downward movement of the coarse powder, so the fractional efficiency is However, there were many drawbacks.

Unexploded 111 (+1) By feeding the coarse powder returned from the rotary classifier to the crusher again without intersecting it with the ascending waste flow, the powder s'h efficiency is improved. By eliminating obstacles in the path of the flow,
The overall purpose of the present invention is to provide a vertical mill capable of reducing mill pressure loss and reducing wind turbine power and vacuum power.b.

For this purpose, the present invention provides a rotary classifier in the upper part of the interior of the boot 7/li, a crusher in the lower part of the interior of the casing, and a pulverizer that penetrates through the casing from the outside of the casing to the lower tip. A vertical mill having a grinding material supply/neat located at the upper part of the crusher and supplying the grinding material to a core powder cell, wherein the casing consists of a partial casing and a lower casing, and A coarse powder collection section is installed in the upper casing and the lower boob! What's more, the lower end of the coarse powder collecting section is located at the outer periphery of the lower casing.
The fact that one is connected to the ground material supply '7 knee and -1' is taken as a sign that there is one.

Regarding the implementation of ``Unexploded 19'', Act 1, Part 2
MI+ while checking the diagram or Figure 4! I will clarify.

2 and 3 show a first embodiment of the invention, and FIG. 4 shows a second embodiment of the invention.

In FIG. 2, ■ is a two-part boot 77, 2 is a lower casing, 3 is a rotary classifier without blades provided inside the upper casing 1, and 4 is a rotary classifier provided inside the lower casing 2. Grinding 1! , the crushing table nope 5 is also a crushing roller, and 6 is a crushing roller from the outside of the lower casing 2.
This is a shredded material J supply chute which passes through the pulverized material J in an airtight manner and has its lower end positioned at the center of the pulverizing table 4.

Further, 7 shown in FIGS. 2 and 3 is a secondary air supply tact provided between the upper casing 1 and the lower casing 2, and 8 is an air supply duct for introducing air from the duct 7 into the upper cane 1. A blowout hole 9 is the lower casing 2
The outer periphery of the N? This is an annular gutter. That is, the coarse powder collecting section is mainly composed of the air jet hole 8 and the annular ring 11!9.

In the rotary classifier vertical mill configured as shown in FIGS. The pulverized material is pulverized by the rotation of the pulverizing roller 5.Then, the pulverized material is entrained by the powder conveying air that is ejected in three directions from the periphery of the table 4, and is classified into powder and coarse powder by the round classification fitting 3. The coarse powder with size 1 jumps out from the classification 1z3 to the external force.Meanwhile, as shown by arrow 10 in Fig. 3,
Secondary air is supplied between the upper casing 1 and the lower casing 2 through the air jet hole 8 in the secondary air door,
Here, the coarse powder as described in the classification table 3 is as follows:
The air jet hole 8 does not intersect with the powder conveying waste.
The swirling flow Q of the secondary air ejected from the annular gutter 9 immediately pushes it into the wall of the annular gutter 9 and extracts it into the lump 9, as shown by the dotted arrow 11. 6, and is securely returned to the center 2 part of the crusher 4.

Fig. 4 shows a slight difference in the purchase of the rotary classifier 3 from the case shown in Fig.
2, and some illustrations of the crushing roller 5 and the crushed material supply line chute 6 are omitted), and their functions and effects are exactly the same as in FIG. 2.

In addition, in each of the examples, 7F was used for the case of one place (bow, the connection between the lower end of the annular gutter 9 and the material to be crushed/needle 6 "+", 11..), but from the annular pipe into the mill In order to lower the height of the chute, by installing multiple /Uni 1.
You can connect multiple pieces with 1" Jr., or you can tighten them with multiple return caps (c).

As shown in the second part of the present invention, a coarse powder collecting section is provided between the upper and lower casings, and the lower end of the collecting section is crushed at the outer periphery of the lower part. Snout I (communicating with Her chute F)
'jL L From the left, it is possible to reliably return the +9 coarse powder that has been classified by the rotary classifier, whether it is crushed or untreated, and that the downward flow of the coarse powder and the inside of the mill are aligned in one line. Since it does not intersect with the powder transport waste containing particles, it is possible to quickly remove the coarse powder from the classification field, reduce mill pressure loss, and reduce the Due to the lack of relics and the small change in direction of the upper gas flow,
The mill pressure drop is so reduced t'1. Ru. Furthermore, since the load in the circumferential direction of the synchronous classification and rock is uniform, the classification efficiency is significantly improved. Therefore, according to the present invention, the effects of the present invention are extremely large, such as improved pulverization efficiency, reduction of mill pressure loss, reduction of blower power, and reduction of mill power.

[Brief explanation of drawings]

FIG. 1 is a vertical elevation view showing an example of a conventional vertical mill, FIG. 2 is a vertical elevation view showing the first embodiment of the present invention, and FIG. 3 is a cutting line A in FIG. 2. FIG. 4 is a cross-sectional f-plane view taken along line A and FIG. 4 is a vertical elevational view showing a second embodiment of the present invention. 1... Upper sea-thong, 2... Lower boo sink,
3...Rotary classifier, 4...Crushing table, 5...
Grinding roller, 6... Grinding material supply/neat, 7...
Secondary air supply tact, 8... air outlet, 9... annular gutter.

Claims (1)

[Claims] 16 Place a rotary classifier/socket in the upper part of the inside of the cage and insert the crusher into the lower part (f) of the above-mentioned crusher. In a vertical mill in which the grinding material supply/nid is located in one part and supplies the grinding material separately, the front part is divided into an upper part and a lower part, and these parts are two-part parts. The lower kaizong is provided with a coarse powder catching part, and the lower end of the f11 powder catching part is outside the lower kaizong 1i!d I'
(2) The rQr+ graded crushed material supply chute is connected to the I series, 11 of them are all 4-!