JPH07256130A - Vertical pulverizing machine - Google Patents

Abstract

PURPOSE:To provide a vertical pulverizing machine which improves pulverizing efficiency and prevents occurrence of abnormal vibrations by constituting this machine in such a manner that only the coarse grains are pulverized after fine grains among supplied raw materials are previously screened away and improving meshing with pulverizing rollers. CONSTITUTION:This vertical type pulverizing machine 1A is internally housed with a raw material grain size screening device 30 for the supply raw materials consisting of a dispersion plate 32 which rotates integrally above the center of a turn table 3A, an air box 34 which is circumferentially disposed around this dispersion plate 32 and has a raw material supplying port 36 at its peak part and has an injection hole for injecting compressed air into the inside at its side face and an air duct 39 which discharges the air in this air box 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical crusher for crushing raw materials such as cement raw materials, slag, clinker, ceramics and chemicals by cooperation of a rotary table and a pulverizing roller, and particularly, it has a high pulverizing efficiency. The present invention relates to a vertical crusher intended for improvement.

[0002]

2. Description of the Related Art FIG. 3 is a kind of crusher for pulverizing raw materials such as limestone, slag and cement raw material into fine powder.
As shown in (1), a vertical crusher 1 having a rotary table and a crushing roller is widely used. This kind of crusher
A disk-shaped rotary table 3A that is driven by a speed reducer 2 by a motor 2A and rotates at a low speed in the lower part of the cylindrical casing 15, and is driven to rotate by hydraulic pressure at a portion equally dividing the outer peripheral portion of the upper surface thereof in the circumferential direction. And a plurality of crushing rollers 4.

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 swingably supported by a casing 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 thickness, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is a raw material crushed by blades 13A. A rotary separator for classification, 16 is an outlet for taking out a product together with gas, and 17 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 rotational direction, and the rotary table 3
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 force in the radial direction and the force in the rotational direction are combined, and the raw material moves to the outer peripheral portion of the rotary table 3A in a spiral trajectory on the rotary table 3A. Since the roller is pressed against the outer peripheral portion and is rotating, the raw material in which the spiral is drawn enters between the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten therein. It is crushed and crushed.

On the other hand, a gas such as air or hot air is introduced into the base of the casing 15 by a hot air duct 20, and this gas is passed through an annular space passage between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing. By being blown up from 14, the pulverized fine powder is entrained in 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 together with the gas from the discharge port 16 and sent to the next step by being classified by the blades 13A.

[0006]

However, in addition to the case where the feed material is pulverized to the particle size of the final product by such a vertical pulverizer, the feed material is preliminarily pulverized (preliminary pulverization).
Then, a vertical crusher may be used as a so-called two-stage crushing primary crusher (preliminary crusher) in which the crushed product is then finish crushed by another different crusher. In this latter case, for example, the feed material such as cement clinker and cement raw material inevitably contains fine particles of 2 to 3 mm or less, and the amount ratio is 20 to 20% of the total weight.
Since it occupies about 30%, not only is it uneconomical to immediately subject the whole to the pulverizing step, but also the pulverizing efficiency is remarkably reduced. Further, when a feed material containing a large amount of these fine particles is fed to the crusher, the raw material is not well caught in the crushing roller, which causes abnormal vibration of the mill. In many cases, it caused inconveniences such as driving interruptions.

[0007]

In order to solve such a problem, in the present invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied onto the rotary table is supplied. In a vertical crusher that applies a predetermined crushing pressure to a crushing roller and crushes between the upper surface of the rotary table and the peripheral surface of the crushing roller, a feed material that stands upright above the center of the rotary table and rotates integrally with the rotary table. A dispersion plate, an air box that is provided around the dispersion plate and that has a feed port for the raw material to the dispersion plate at the top and a plurality of injection ports that inject compressed air into the inside of the air box; The raw material particle size sorting apparatus for the feed raw material, which is connected to the box and comprises an air duct for guiding the compressed air containing fine particles in the feed raw material to the outside of the system, is housed inside. Also, the second
In the invention described above, the side surface of the air box is made of punching metal (perforated plate) having a canvas attached to the inner surface.

[0008]

In the vertical crusher of the present invention, the feed material drops onto the dispersion plate before being dropped onto the rotary table and crushed, and compressed air is blown on the way from the periphery of the dispersion plate.
The fine particles having a relatively small particle size are discharged from the air duct together with the compressed air, and only the coarse particles and the large-sized feed material are dropped on the rotary table and subjected to the crushing action. The raw material crushed on the rotary table falls in the space around the rotary table and is discharged from the system through the discharge port. Further, in the second aspect of the invention, the compressed air entering the air duct is well dispersed and a uniform upward flow is formed, so that the air swept effect of fine particles is improved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention,
FIG. 1 is an overall vertical sectional view of a vertical crusher, and FIG. 2 is an enlarged vertical sectional view of a main part of the vertical crusher. In FIG. 1, a vertical crusher 1
Above the center of the rotary table 3A of A, a dispersion plate 32, which is a horizontal disk, is fixedly installed at the top via a column 32a, and a cylindrical air box 34 coaxial with the dispersion plate 32 is provided around the dispersion plate 32. It is suspended from the top plate 15a of the casing 15.
The air box 34 has a raw material supply port 36 at the center of the top,
A cylindrical raw material discharge port 38 is provided at the center of the lower part so as to surround the support column 32a, and the side surface and the inclined surface of the lower part of the side surface are formed by punching metal (perforated plate) 34a having a large number of holes, and are guided from the outside to the inside. The compressed air supplied to the compressed air supply pipe 40, the collecting pipe 42 connected to the compressed air supply pipe 40, and the air chamber 44 formed around the side surface of the compressed air supply pipe 40.
4 is configured to be injected. Further, an air duct 39 for discharging the compressed air that has been injected is arranged on the outer peripheral portion of the top of the air box 34. The air duct 39 is connected to a cyclone separator and a suction fan (not shown). As described above, the compressed air inlet of the air box 34 is a large number of holes of the punching metal 34a used as the side surface and the inclined surface. As shown, it is desirable to attach a canvas (woven fabric) 34b to the inner surface of the punching metal 34a. The canvas 34b is bolted to the punching metal 34a. Thus, the vertical crusher 1A of the present invention is one in which the separator 13 provided on the top of the vertical crusher 1 of the conventional structure shown in FIG. 3 is removed, and the raw material particle size selection device 30 is provided instead. A rotary table 3A that rotates around a vertical axis via an electric motor and a speed reducer 2 (not shown) and a crushing roller that swings on the rotary table 3A via an arm 5 and a shaft 6 via an arm 7 and is pressed by a hydraulic cylinder 9. 4, the raw material supplied onto the rotary table 3A is crushed between the rotary table 3A and the crushing roller 4, overflows the rotary table 3A and falls into the annular space passage 14, and the scraper 6
It is scraped by 0a and is conveyed to the outside of the machine by the belt conveyor 70 via the stone discharging chute 60. An upward airflow is caused to flow through the annular space passage 14 by a duct (not shown), and the fine powder in the raw material or the pulverized fine powder is conveyed by air to the inside of the raw material discharge port 38 of the air box 34.

The operation of the vertical crusher 1A constructed as above will be described. The raw material supplied from the raw material supply port 36 drops to the rotating dispersion plate 32, moves spirally to the outer periphery by centrifugal force, then overflows the barrier plate around the dispersion plate 32, and freely falls inside the air box 34. To do. On the other hand, the compressed air supply pipe 40 and the collecting pipe 4 to the air chamber 44
Compressed air supplied via 2 punched metal 3
Fine particles of 2 to 3 mm or less in the feed material that has passed through the inside of the air duct 4a and the canvas 34b and falls on the air flow pass through the air box 34 and the air duct 39.
Is discharged together with the air. On the other hand, the coarse particles drop from the raw material discharge port 38 onto the rotary table 3A, are crushed as described above, and are conveyed to the outside of the machine by the belt conveyor 70 via the annular space passage 14. The adjustment of the selection particle size in the raw material particle size selection device 30 is performed by adjusting the amount of suction air by adjusting the damper of the downstream suction fan connected to the air duct 39. That is, as the air volume increases, the particle size of the fine particles discharged to the air duct 39 increases. Further, the air box 34 is a punching metal (perforated plate) 34a having a large number of dispersed holes, and a canvas (woven fabric) 34b is further adhered to the inner surface of the air box 34.
As a result of the equalization of the dispersion of the compressed air entering the inside of No. 4, the recovery rate of the raw material fine particles falling from the periphery of the dispersion plate 32 is extremely high. As described above, in the vertical crusher 1A of the present invention, the fine grain raw material of 2 to 3 mm or less is removed in advance and then dropped onto the rotary table 3A and crushed, so that the biting into the crushing roller 4 is improved. As a result, the crushing efficiency is increased, the production amount is improved, and abnormal vibration can be prevented.

[0011]

According to the present invention, the pulverization efficiency is increased, the production amount is improved, and abnormal vibration can be prevented.

[Brief description of drawings]

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

FIG. 2 is an enlarged vertical sectional view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 3 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinding Machine 1A Vertical Grinding Machine 3A Rotary Table 4 Grinding Roller 5 Arm 6 Shaft 7 Arm 9 Hydraulic Cylinder 14 Annular Space Passage 15 Casing 16 Discharge Port 17 Raw Material Input Chute 30 Raw Material Particle Size Sorting Device 32 Dispersing Plate 34 Air Box 34a Punching metal 34b Canvas 36 Raw material supply port 38 Raw material discharge port 39 Air duct 40 Compressed air supply pipe 42 Collecting pipe 44 Air chamber 60 Exhaust stone chute 60a Scraper 70 Belt conveyor

Claims (2)

[Claims] 1. A plurality of rotatable crushing rollers are arranged on an upper surface of an outer peripheral portion of a rotary table, and a predetermined crushing pressure is applied to the crushing roller to feed the raw material supplied on the rotary table to the upper surface of the rotary table and the peripheral surface of the crushing roller. In a vertical crusher for crushing between the rotating table and the rotating table, a feed material dispersion plate that stands upright above the center of the rotating table and rotates integrally with the rotating table; An air box provided with a feed port for the raw material to the plate and having a plurality of injection ports for injecting compressed air into the inside of the plate, and the compressed air containing fine particles in the feed raw material connected to the air box are provided outside the system. A vertical crusher having a raw material particle size sorting device for the feed material, which is composed of an air duct leading to the inside, housed inside. 2. The vertical crusher according to claim 1, wherein the side surface of the air box is made of punching metal and canvas attached to the punching metal.