JPH05245404A - Vertical type crusher - Google Patents

Abstract

(57) [Summary] [Purpose] A preliminary crusher used in a crushing facility for finely crushing cement clinker, blast furnace slag, ceramics, etc., in which the raw material supplied to the secondary crusher is made up of only a limited amount of fine particles. Therefore, it is an object of the present invention to provide a preliminary crusher capable of reducing the reduction ratio of the secondary crusher, and to achieve energy saving and improvement of crushing efficiency of the entire crushing equipment. [Composition] In a vertical crusher for crushing the raw material supplied to the center of the rotary table 3A in cooperation with the crushing roller 4,
A pocket 30 for the falling raw material is provided in the annular space passage 14 formed by the rotary table 3A and the casing 15, and the pocket 3 at the substantially center of the adjoining crushing rollers 4, 4 is provided.
Inflow air intake 60 is installed at 0 and intake 60
An inlet pipe 70 for guiding the inflowing air to the top is disposed inside the casing 15 at the upper part of the above, and a discharge chute 40 for discharging the falling raw material of the pocket 30 and a scraper 40a are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The vertical crusher of the present invention is used as a preliminary crusher for finely crushing chemicals such as cement clinker, blast furnace slag and ceramics in cooperation with a rotary table and a crushing roller. Mold crusher.

[0002]

2. Description of the Related Art As a kind of pulverizer for pulverizing raw materials such as limestone and cement raw material into fine powder, a vertical pulverizer 1 having a rotary table and pulverizing rollers is widely used as shown in FIG. Has been. This type of crusher has a reduction gear 2 driven by a motor 2A at the bottom of the cylindrical casing 15.
Disk-shaped rotary table 3A driven by
And a plurality of crushing rollers 4 that are driven to rotate by being pressed by hydraulic pressure or the like at locations where the outer peripheral portion of the upper surface is equally divided in the circumferential direction.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are pivotally supported by a shaft 15 by a shaft 6, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer pressure, 14 is an annular space passage around the rotary table 3A, 13 is a rotary separator for classifying raw material crushed by blades 13A, and 16 is a gas together with gas. The gas outlet 17 for taking out the product is a raw material charging chute.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material charging chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. At times, the rotary table 3A receives a force in the rotation direction, and the rotary table 3A
It slides with A and performs a rotation somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the radial direction force and the rotational direction force are combined, and the raw material is the rotary table 3.
A spiral locus is drawn on A to move to the outer peripheral portion of the rotary table 3A. Since the roller is pressed against the outer periphery and is rotating, the raw material in which the spiral is drawn enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten. It is crushed and crushed.

On the other hand, the duct 1 is provided at the base of the casing 15.
A gas such as air or hot air is guided by 4A, and this gas is blown up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing 15 to pulverize the fine powder. Is carried by the gas and rises in the casing 15, and the separator 13 located at the upper part
The product having a predetermined particle size is discharged from the discharge port 16 together with the gas by the blade 13A of the above, and is sent to the next step.

[0006]

However, when the conventional vertical crusher as described above is used as a preliminary crusher for performing finish crushing with a ball mill or a rod mill in the crushing of cement clinker, for example, a vertical crusher is used. All the raw materials crushed by the crusher are overflowed and dropped from the outer circumference of the rotary table and supplied to the ball mill, or these are distributed to a certain ratio by a distributor, 1 part is ball milled and the rest is vertical crushed. The method of returning to the plane was used. However,
In this method, when a conventional vertical crusher is used as it is as a preliminary crusher, the particle size of the crushed product is widely distributed from the small size to the almost as-supplied particle size, and it is supplied to the finishing mill. Since the width of the particle size distribution is too wide,
Since the reduction ratio (crushing ratio) of the ball mill is large and the crushing efficiency is poor, there was a problem that the capacity of the ball mill was low. In addition, in order to solve the above problems, a method is adopted in which the total amount of raw material discharged from the vertical crusher is sieved with a vibrating screen, only undersize is supplied to the ball mill, and oversize is returned to the vertical crusher. Attempts were also made to reduce the reduction ratio of the ball mill, but in this case the vibrating screen was heavily worn and maintenance was difficult. Therefore, there has been a long-felt demand for a preliminary crusher that supplies only relatively fine particles to the ball mill as a feedstock so that the reduction ratio of the ball mill is reduced and that the vertical grinder classifies the crushed product with less maintenance problems. ..

[0007]

In order to solve the above-mentioned problems, in the vertical crusher of the present invention, the outer periphery of the rotary table is rotatably arranged around a vertical axis in an upright cylindrical casing. A plurality of rotatable crushing rollers are arranged on the upper surface, and the raw material supplied from the raw material charging chute provided by vertically hanging the axis of the vertical crusher from the center of the top of the crusher is crushed to the crushing roller in a predetermined manner. In a vertical crusher that applies pressure to crush between the upper surface of a rotary table and the peripheral surface of a crushing roller, a pocket for falling raw material is provided in an annular space passage formed by the rotary table and the casing, and adjacent crushers are crushed. An inlet for the inflowing air is arranged in the pocket at approximately the center between the rollers, and an inlet pipe for guiding the injected air to the top of the crusher is arranged inside the casing above the inlet, and the intake is provided. The raw material that has fallen into the pocket in any of connecting the discharge chute to escape to the outside, and the scraper to sweep the pocket inner surface is configured to fixedly provided on the rotary table.

[0008]

In the vertical crusher of the present invention, although there is no separator, ascending airflow is caused to flow in the annular space passage, and among the raw materials overflowing from the rotary table after crushing, fine powder and coarse powder are introduced into the introducing pipe together with the ascending airflow. It flows and is discharged from the vertical crusher, collected by a collecting device such as a dust collector installed outside the machine, and supplied to a ball mill for secondary crushing. On the other hand, coarse particles and large lumps that cannot ride in the rising air flow fall into the pocket under the rotary table, are scraped up by the scraper, discharged from the discharge chute to the outside of the vertical crusher, and transported to the vertical crusher again. Supplied and crushed.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show a vertical crusher according to an embodiment of the present invention, FIG. 1 is an overall vertical cross-sectional view, FIG. 2 is a plan view of a crushing section, and FIG.

In the figure, the top plate 15a of the casing 15 is shown.
The raw material charging chute 17 hangs down from the center of the rotary table 3A, and the lower end opening thereof faces directly above the center of the rotary table 3A.
A plurality of crushing rollers 4 are provided near the outer circumference of the rotary table 3A.
Is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7, and is arranged so as to be rotated by being pressed by a rotary table 3A by the operation of the hydraulic cylinder 9. An annular pocket 30 having a U-shaped cross section is disposed in the lower portion of the annular space passage 14 outside the rotary table 3A.
An inlet (intake pipe) 60 for introducing air is fixed from the outside of the casing 15 at a position of the annular space passage 14 substantially in the center of the adjoining crushing rollers in a plan view, and an introducing pipe 70 is provided on the inner surface of the casing 15 immediately above the inlet. Arrange. The introduction pipe 70 is vertically or almost vertically inclined, and has a rectangular tube 70a having a trumpet-like expanded diameter in the tangential direction and a cylindrical tube 70b connected to the upper portion of the introduction tube 70. The upper portion of the casing has a top plate. It penetrates 15a and is connected to the collection device of the next process. Introducing pipes 70 in the same number as the crushing rollers 4
Alternatively, as shown in FIG. 3, a horizontal annular collecting pipe 70c may be collectively discharged from one location. A collector such as a dust collector, a suction fan, and an air volume control valve for the suction fan are disposed downstream thereof to control the air volume flowing through the introduction pipe 70.

Further, as shown in FIGS. 2 and 3, a discharge chute 40 is provided at least at one position on the circumference of the pocket 30, and the raw material dropped on the inner surface of the pocket 30 is attached to the rotary table 3A to form the rotary table 3A. The scraper 40a that rotates integrally is used to sweep and drop it, and it is taken out of the vertical crusher 1 and transferred to the raw material charging chute 17 by the belt conveyor 50 or a rotary feeding means below it and re-supplied. Is becoming

The vertical crusher of the present invention is constructed as described above, and almost the entire amount of the raw material falling from the rotary table is 20 to 30 m / s from the annular space passage like the conventional vertical crusher. It does not blow up at a high speed like the above, and does not blow it back onto the separator or rotary table, but a low-speed ascending air current of about 2 to 3 m / s is passed through the annular space passage to produce fine powder, coarse powder, and fine particles of approximately 3 mm or less. It is intended that the air is introduced into the introduction pipe together with the air and supplied to the ball mill for secondary crushing via the collecting device outside the machine. The limit particle size of the fine particles discharged through the introduction pipe 70 is controlled by the amount of air, that is, the flow velocity flowing through the annular space passage.
As a result, the maximum particle size of the feed material fed into the ball mill is about 3 mm or less, and the reduction ratio (grinding ratio) in the ball mill as the secondary crushing is greatly reduced. As a result, the diameter of the ball milling media is significantly reduced. it can. That is, the crushing ability of the ball mill in the method of discharging the whole amount from the lower part of the vertical crusher and supplying it to the ball mill, or the method of supplying a part of the discharged crushed product to the ball mill and circulating the rest to the vertical crusher. Compared to,
It was found that a crushing capacity of 1.5 to 1.8 times was obtained. Therefore, compared with the above-mentioned conventional method, in the present invention, although the power of the suction fan for generating a low-speed upward airflow in the vertical mill is excessively generated, the ball mill crushing capacity can be significantly increased. The production effect of the entire system including the vertical crusher and ball mill is significantly improved, and the power consumption per ton of product can be significantly reduced. In addition,
The introduction pipe 70 is provided approximately in the middle between the crushing rollers, because a large number of crushed fine particles are discharged to the kicking side of the crushing rollers (downstream side in the rotating table rotation direction) and the dam ring 3B overflows. This is because this position is the reason why the fine particles are most likely to be carried in the ascending air current.

[0013]

As described above, in the vertical crusher of the present invention, the air inlet is provided in the annular space passage, and
Since the crusher is equipped with an introduction pipe to selectively take out relatively fine particles and supply them to the ball mill,
The crushing capacity of the ball mill is greatly improved, and the power consumption per unit weight is significantly reduced. In addition, a classifying mechanism such as a vibrating screen, which is particularly prone to wear, is not required, and maintenance is significantly facilitated.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is a schematic plan view of a crushing unit showing an embodiment of a vertical crusher of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a crushing section showing an embodiment of a vertical crusher of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical grinding machine 3A Rotary table 3B Dam ring 4 Grinding roller 14 Annular space passage 15 Casing 15a Top plate 17 Raw material charging chute 30 Pocket 40 Discharging chute 40a Scraper 50 Belt conveyor 60 Intake pipe (intake pipe) 70 Introducing pipe 70a Square pipe 70b cylindrical pipe 70c collecting pipe

Claims (1)

[Claims] 1. A vertical crusher having a plurality of rotatable crushing rollers disposed on an upper surface of an outer peripheral portion of a rotary table which is rotatably arranged around a vertical axis in an upright cylindrical casing, and which is disposed from the center of the top of the crusher. In the vertical crusher for crushing the raw material supplied from the raw material charging chute provided by vertically hanging down the shaft core line of the above, between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller, A pocket for the falling raw material is provided in an annular space passage formed by the rotary table and the casing, and an inlet for inflowing air is provided in the pocket approximately in the center between adjacent crushing rollers, and the inlet is provided. An inlet pipe for guiding the injected air to the top of the crusher is provided inside the casing of the upper part of the above, and a discharge chute for discharging the raw material dropped in the pocket to the outside of the machine is connected to any of the intake ports, A vertical crusher in which a scraper for sweeping the inner surface of the pocket is fixedly mounted on the rotary table.