JPS5849448A - Shaft type roller mill - 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 roller mill, and in particular, it is possible to effectively press each grinding roller onto a full rotation table, promote downsizing and weight reduction of the crushing roller rolling device, and facilitate maintenance and inspection. This invention relates to a vertical roller mill that can be used.

In general, a vertical roller mill is a device that grinds lump-like materials to be crushed, such as cement raw materials and coal, into granules or powder. The pulverized material is then pulverized between a pulverizing roller that rotates following the rotation of the rotary table, and the pulverized material is blown upward into a rising hot gas stream and classified by a separator, and then classified into fine powder. The mill casing is configured to transport the gas along with the gas flow into the mill casing.

In conventional vertical mills, the following two methods are known for pressing the grinding roller onto the rotary table.

(Re-Mill Insert the exinder arm inside the casing into the casing diameter, attach the crushing roller to its tip, raise the swing arm with a hydraulic cylinder, and press the roller against the rotary table.

(2) One press ring (round or triangular) is placed on three crushing rollers, and the press rings are pressed down from three locations with hydraulic cylinders to press the rollers into contact.

In the above method, the crushing roller is pushed down from a distance using a hydraulic cylinder via a swing arm.
A large bending load acts on the swing arm, and it must have the strength to withstand this bending load.

Therefore, the swing arm becomes large and the structure becomes complicated. Nine, to my friend who removes this defect,
It is necessary to shorten the swing arm as much as possible. Therefore, if the casing diameter is made smaller and the distance between the mill casing and the rollers is shortened, the powder concentration in the casing diameter increases, and the pressure loss of the hot gas blowing up the pulverized material increases.

Furthermore, in the method (2) above, since 193 crushing rollers are pressed against one press ring, the press ring becomes large and heavy. Furthermore, there is interdependence between the grinding rollers, e.g. one roller
If the roller is lifted too much or if it rotates incorrectly, it will adversely affect the crushing performance of other rollers. Furthermore, when replacing the roll liner, the heavy russing ring must be removed, which is time-consuming, and all rollers must be replaced at once, which is less economical.

The present invention was devised to effectively solve the problems of conventional vertical mills as described above, and its purpose is to efficiently and accurately press each grinding roller onto a rotating table, and to improve the grinding process. It is an object of the present invention to provide a vertical roller mill in which a roller rolling device can be made smaller and lighter in weight, and maintenance and inspection can be easily performed.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 1 is a cylindrical casing, - a reducer 3 is provided on a bottom base 2 inside the casing 1, and a rotary table 4 is mounted on the reducer 3 so as to be horizontally rotatable.
is provided, and is configured so that the rotation of an electric motor (not shown) is reduced by a speed reducer 3 and transmitted to the rotary table 4. An annular groove 5 as shown in the figure is formed on the peripheral edge of the upper surface of the circular rotary table 4, and crushing rollers 6 are disposed along the groove 5 at appropriate intervals.

An opening 7 is formed at a position VC of the casing 1 facing each crushing roller 6, and a door 8 is provided in the opening 7 to airtightly cover the opening 7.
is provided. The door 8Fi is pivotally supported by the opening/closing pin 9 on the opening/closing pin 9, so that the opening 7t can be opened and closed.

The crushing roller 6 has one end rotatably supported by a pivot shaft 11 (b) and is rotatably supported by a bracket 10 extending above and toward the table 4 from this. As shown in FIGS. 1 and 2, both ends of the pivot 110 have nine through holes formed at the mating surfaces of the flan 1a of the casing 1 that partitions the opening T and the flan 8a of the door 8 that abuts the flan 1a of the casing 1. from the outside of the casing 1,
7 runno 1 formed on the outer circumference side of goose song 1 below door 8
Bearings 12 and 12vc are respectively supported by bearings erected on b. Further, the space between the currency hole and the pivot shaft 11 is set to a suitable distance to prevent outside air from leaking into the casing 1.
has been applied.

On the other hand, a traction mechanism 13 is provided for pulling down the roller support portion of the bracket 10 and lowering the roller 6 onto the soil of the table 4. The traction mechanism 13 includes a hydraulic cylinder 14 fixedly installed on the bottom base 2, and a joint pin 15 that is towed by the hydraulic cylinder 14 and is located near the roller support portion of the bracket 10.
It consists of a tension rod 16 connected through a

Further, an annular duct 17 for supplying hot gas is installed on the surface of the table 4 to blow up the crushed material crushed between the rotary table 4 and the crushing roller 6 into the hot air current blowing upward from the outer circumference of the table 4. The table 4 is airtightly disposed around the entire circumference, and a hot gas outlet 18 is formed on the outer circumferential side of the table 4. On the actual flow side, the rolling down device for the crushing roller 6 is mainly composed of a traction mechanism 13, a Franz 10, a pivot 11, and a bearing 12.

Next, the operation of this embodiment will be described.

A C tension rod 16 is used to operate the hydraulic cylinder 14.
is towed, and the tension rod 1 is pulled through the joint pin 15.
The bracket 10 connected to 6Vc is pulled down, rotates about the bracket 10tj pivot 11 as a fulcrum, and is pushed down onto the rotary table 40 grooves 5 by the crushing roller 6 supported at the tip of the bracket 10. The roller 6 that has been pushed down onto the rotary table 4 is moved to follow the rotation of the rotary table 4, which is rotated via the reducer 3 by the operation of the electric motor.
The object to be crushed supplied onto the table 4 is crushed between the roller 6 and the table 4. The pulverized material that has been pulverized and sent to the periphery of the tape luer 4 is conveyed upward along with the hot air flow blown up from the hot gas outlet 18, and is transported upward to the chamber provided outside the casing 1. Only the fine powder is classified by the rotor and taken out of the casing 1 along with the gas flow.

In this way, each crushing row 26 pulls the bracket 10t that supports each roller 6 near the roller bearing part, so the bracket 1oVc is large.Since no large bending load is applied, the bracket is small and lightweight. In addition, a large load is not applied to the pivot shaft 11vc of the Franz 10, and the weight of the casing 2 and roller (7) rolling device can be significantly reduced. Furthermore, even if the rollers 6 of one VC malfunction during crushing, or are lifted due to plugging or crushing, each roller 6 is in pressure contact with the table 4.
The roller 6 can be appropriately pressed against the table 4 without causing deterioration in crushing performance such as floating of the other rollers 6 and the like.

Also, Axis 11? Since the bearing 12 that supports the shaft is outside the casing 1 and is not exposed to the gas inside the casing chamber 19 at temperature and having a good powder concentration, troubles such as powder getting caught in the bearing part may occur. There isn't. Furthermore, the condition of the bearing 12 can be easily inspected even during mill operation. In addition, the Franz) 10 load that the pivot 11 receives is supported by the bearing 12 that is erected on the 17 run 1bVc of the cage 1, and this load is not applied to the door 8.
Door 8V'1l111! : A simple amount is sufficient. Also,
The door 8 can be opened and closed independently using the opening/closing pin 9 as a fulcrum independently of the openings 6 and the racket 10, and the casing chamber 19
Easy to inspect inside.

Furthermore, in order to take the roller 6t out of the casing 1, first remove the joint bin 15, separate the bearing 12 from the casing body (for example, make the bearing part into a split type as shown in FIG. 3), and open the door. 8. The roller 6t can be easily taken out of the casing 1 by connecting the roller 6t and the bracket 10 by appropriate means and rotating the door 8 about the opening/closing pin 9 as the center of rotation. The pivot 11 may be the center of rotation for taking out the row 26 to the outside. When the bracket is rotated around the pivot 11, the trajectory of the upper end of the row 26 becomes the curved line shown in FIG. 7 can be made smaller, and the height of the goose song 1 can be lowered.In the above embodiment, the bearing 12 was installed upright on the outside of the casing 1 at the 7 run no. 1b, J:VC. As shown, the opening 7 may be defined by the flantz 1a of the casing 1 and the seven rungs 8asVc of the door 8.

Furthermore, as shown in FIG. 5, the door 8 may be formed by being vertically divided into two parts, an upper door part 8b and a lower door part 8c. 1/(is 'axis 1i'ft
A through hole for extending 1υ outside the Kuhn 1 is formed, a bearing 12μ supporting the pivot 11, and a lower door portion 8.
A bearing mounting portion 20VC is provided which protrudes outward. The upper door part 8b (1) can be opened and closed using the hinge 21 provided on the dividing surface of the upper and lower doors as a fulcrum.The reaction force of the roller pressing force is supported by the casing 1 via the lower door part 8c, so the upper boundary part 8b The strength /'i is the most necessary (, a lightweight and simple one is sufficient.Also, in the embodiment shown in FIG. Good.-As is clear from the above explanation, the present invention can exhibit the following excellent effects by using 7"L.

(Li) Since the bearing that supports the pivot is installed outside the casing room, it is not exposed to the high temperature and high powder concentration gas inside the casing room, so there are fewer troubles with the bearing, and inspections can be made even during mill operation. Maintenance is easy.

(2) For each crushing roller, the vicinity of the roller bearing part of the F-bracket is pulled by the traction mechanism and the crushing roller is pressed against the rotary table, so the entire crushing roller rolling device can be significantly reduced in size and weight. The rollers can be rolled down efficiently with a small traction force, and there is no interference between the rollers.

(3) The rolling down device is lightweight and compact, the crushing roller can be easily taken out of the casing, and the roll liner can be replaced economically by replacing only the one that has worn out.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing one embodiment of a vertical mill according to the present invention, FIG. 2 is a partially cutaway side view of the same, and FIG. 3 is a front view showing another embodiment of the present invention. It is a perspective view which shows the 4th. In the figure, 1il"t caning, 4 is a rotating table, 6 is a crushing roller, 10 is a bracket, 11 is a pivot, 12 is a bearing, and 13 is a traction mechanism. Patented by Ishikawajima Harima Heavy Industries Co., Ltd. (and 1 others) Name) Agent Patent Attorney Nobuo Kinutani Continued from page 1 Applicant Sumitomo Cement Co., Ltd. 1, Kanda Mitoyo-cho, Chiyoda-ku, Tokyo

Claims (1)

[Claims] In a vertical roller mill that is completely equipped with a rotary table rotatably supported in a cylindrical casing and crushing rollers arranged at appropriate intervals along the rotational direction of the rotary table, each of the above-mentioned crushing The roller is rotatably supported by a bracket having one end provided on the casing side and a bearing provided outside the casing room to support the pivot shaft, and the other end extending above the rotary table. The crushing roller is supported by Cτ, which rotates following the rotary table, and one side of the traction mechanism that pulls the crushing roller downward from the rotary table is connected to the vicinity of the crushing roller support part of the bracket, so that the crushing roller is attached to the bracket. A vertical roller mill characterized in that it is configured to be in pressure contact with a rotary table through a rotary table.