CN101318154A

CN101318154A - Internal screening roller type vertical mill

Info

Publication number: CN101318154A
Application number: CNA200810123058XA
Authority: CN
Inventors: 张桂才
Original assignee: 张桂才
Current assignee: Nanjing Juli Powder Engineering Technology Research Institute Co., Ltd
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2008-12-10
Anticipated expiration: 2028-06-20
Also published as: CN100588462C

Abstract

The invention relates to material grinding equipment used in the field of cement production, in particular to an internal screening roll-type vertical mill, comprising a millstone and a grinding roller. The external edges of the millstone are connected with a classification screen. The millstone and the classification screen are covered by two layers of cylinders: an internal cylinder inside and an external cylinder outside. A fine powder cavity is arranged between the classification screen and the internal cylinder. Screen pores of the classification screen are communicated with the fine powder cavity. The outside of the fine powder cavity is communicated with a plurality of fine powder channels distributed on the circumference of the internal cylinder. The fine powder channels pass through an interlayer between the internal cylinder and the external cylinder and extend out from the external cylinder and enter a fine powder outlet. The upper edge of the classification screen is provided with an upper plane. The upper plane extends into the upper end of the interlayer between the internal cylinder and the external cylinder. A crude powder slide carriage is arranged in the interlayer, a lower end of the crude powder slide carriage is led to a crude powder outlet. The material grinding equipment not only assures grinding quality but also avoids energy waste and equipment vibration caused by repeated powder grinding, simplifies the grinding technique and prolongs the service life of the wear parts.

Description

Internal screening roller type vertical mill

Technical field

The present invention relates to a kind of material grinding equipment that is used for industries such as manufacture of cement, metallurgy, electric power, specifically is a kind of internal screening roller type vertical mill.

Background technology

The grinding of material is the necessary operation of the raw material processing procedure of many industry production, for example, the cement grinding operation is the important step in the cement production process, and it not only is related to the quality of cement, simultaneously also to the output and the energy consumption important influence of cement.When making great efforts to improve cement grinding equipment yield and cement fineness, reduce the energy consumption of grinding system to greatest extent, have important practical significance for saving the energy and improving economic benefit of enterprises.

In the existing milling equipment, roller type vertical mill is a kind of more equipment that uses, its structure as shown in Figure 1, generally comprised a rotatable mill a, the grinding roller b that several cooperate with mill is set above mill, material is pulverized and is entered under the extruding of mill and grinding roller among the hopper c outside the mill, is pushed to discharging opening d by a material scraping plate that rotates simultaneously with mill again and discharges.This class formation exists following defective: 1, the material discharge method is forced to discharge by scraper plate, and energy consumption is big, the material scraping plate serious wear; 2, wear-out part such as mill liner plate is short service life; 3, in order to guarantee grinding effect, usually the material of discharging behind the grinding is partly circulated to enter once more and carry out grinding repeatedly in the mill, though this can improve powder quality, but the qualified fine powder of part also is brought in the mill during owing to the circulation grinding, repeat grinding, wasted power consumption, and because the existence of fine powder easily produces vibration.

Summary of the invention

Technical problem to be solved by this invention is, provide a kind of rational in infrastructure, energy consumption is low, can carry out the sorting of meal and fine powder, the internal screening roller type vertical mill of wear-out part long service life automatically.

Internal screening roller type vertical mill of the present invention include one by power drive rotation mill, the mill top is mounted with the grinding roller that several have the conical surface; The outer of described mill is connected with the classifying screen of an inverted cone surface shape, and mill and classifying screen are surrounded by two-layer cylindrical shell, i.e. the outer cylinder body in the Nei Ce inner barrel and the outside; Be provided with the fine powder chamber of the annular that can hold fine powder between classifying screen and the inner barrel, the sieve aperture of classifying screen communicates with the fine powder chamber, the fine powder chamber outside communicates with a plurality of fine powder passages on being arranged in the inner barrel circumference, the interlayer that the fine powder passage passes between inner barrel and the outer cylinder body stretches out outside the outer cylinder body, and leads to the fine powder outlet; The upper edge of classifying screen has one section and goes up the plane, and the plane extends to the interlayer upper end between inner barrel and the outer cylinder body this on, is provided with in this interlayer from extending to meal slide carriage down, and the lead meal of outer cylinder body bottom of the lower end of meal slide carriage exports.

The inner face of described classifying screen is provided with helical blade, makes the meal material can enter interlayer between the inside and outside cylindrical shell in the upper edge that moves up under the thrust of helical blade and the action of centrifugal force and cross classifying screen.

The mill upper surface of grinding roller periphery is provided with the striker plate of annular, just shifts to classifying screen after making powder behind the stone roller surpass the height of striker plate.

In above-mentioned fine powder chamber, be provided with the spreading disk of annular, spreading disk together rotates with mill.

Be coated with liner plate on the described mill, liner plate is provided with the installing hole that passes for screw, and the upper/lower terminal of this installing hole is provided with the stepped hole that can settle sunk screw, its upper and lower faces can be overturn exchange use.

The present invention has increased sorting structures such as classifying screen and inside and outside cylindrical shell on original roller type vertical mill basis, can realize automatic sorting thick, fine powder material, meal can be sent into circulation grinding in the mill once more by hoisting mechanism, both guaranteed the grinding quality, power wastage and the vibration equipment also having avoided fine powder to repeat grinding and caused, and or to simplify the flow process of whole grinding process; In addition, the liner plate on its mill can use another side work through the smooth upset again of simple process back behind a surface wear, thereby has prolonged its service life, has reduced cost.

Description of drawings

Fig. 1 is the roller type vertical mill structural representation of prior art;

Fig. 2 be the embodiment of the invention the overall structure schematic diagram;

Fig. 3 is the Facad structure schematic diagram of the inside and outside cylindrical shell of the embodiment of the invention;

Fig. 4 is the side structure schematic diagram of the inside and outside cylindrical shell of the embodiment of the invention;

Fig. 5 is the mill lining plate structure schematic diagram of the embodiment of the invention.

The specific embodiment

Reference numeral comprises among Fig. 2～Fig. 5: mill 1, grinding roller 2, liner plate 3, classifying screen 4, inner barrel 5, outer cylinder body 6, fine powder chamber 7, fine powder passage 8, interlayer 9, fine powder outlet 10, last plane 11, meal slide carriage 12, meal outlet 13, helical blade 14, striker plate 15, spreading disk 16, installing hole 17.

The course of work of embodiments of the invention is: material enters mill 1 by the spout of top, under the rolling of mill 1 and grinding roller 2, pulverized, the material of pulverizing is outwards motion under action of centrifugal force, and be subjected to stopping of peripheral striker plate 15, the material that surpasses the striker plate height climbs over striker plate and enters screen area, under the effect of classifying screen 4, thin material passes sieve aperture and enters the fine powder chamber 7 of inner barrel 5 inboards and drop on the spreading disk on 16, rotation along with spreading disk, under action of centrifugal force, fine powder material is thrown in the fine powder passage 8 on the inner barrel circumference, finally sends outside the outer cylinder body 6 and by conveying equipment and is finally discharged by fine powder outlet 10; And the meal material in screen area, then pass through the turning effort of classifying screen 4, driving spiral by the helical blade on the classifying screen 14 moves upward, because action of centrifugal force, be distributed on the last plane 11 of classifying screen upper edge, fall into meal that interlayer 9 between the inside and outside cylindrical shell and the meal slide carriage 12 in interlayer be slipped to the bottom subsequently and export 13 places and discharge outside the mill, these meal material can utilize the outer elevator of mill or other conveying devices to be transported to by spout again to continue on the mill to mill.

As shown in Figure 5, liner plate 3 is fastened on the mill by installing hole 17, and the upper/lower terminal of installing hole is provided with the stepped hole that can settle sunk screw, its upper and lower faces can be overturn exchange use.Like this, behind liner plate one surface wear, can use another side work through the smooth upset again of simple process back.

Claims

1, a kind of internal screening roller type vertical mill includes mill (1), and the mill top is mounted with several grinding rollers with conical surface (2); It is characterized in that: the outer of described mill is connected with the classifying screen (4) of an inverted cone surface shape, and mill and classifying screen are surrounded by two-layer cylindrical shell, i.e. the outer cylinder body (6) in the Nei Ce inner barrel (5) and the outside; Be provided with the fine powder chamber (7) of the annular that can hold fine powder between classifying screen (4) and the inner barrel (5), the sieve aperture of classifying screen communicates with the fine powder chamber, the fine powder chamber outside communicates with a plurality of fine powder passages (8) on being arranged in the inner barrel circumference, the interlayer (9) that fine powder passage (8) passes between inner barrel and the outer cylinder body stretches out outside the outer cylinder body, and leads to fine powder outlet (10); The upper edge of classifying screen has one section and goes up plane (11), and last plane extends to interlayer (9) upper end, is provided with in interlayer (9) from extending to meal slide carriage (12) down, and the lead meal of outer cylinder body bottom of the lower end of meal slide carriage exports (13).

2, internal screening roller type vertical mill according to claim 1 is characterized in that: the inner face of classifying screen (4) is provided with helical blade (14).

3, internal screening roller type vertical mill according to claim 1 and 2 is characterized in that: the mill upper surface of grinding roller periphery is provided with the striker plate (15) of annular.

4, internal screening roller type vertical mill according to claim 3 is characterized in that: in fine powder chamber (7), be provided with the spreading disk (16) of annular, spreading disk together rotates with mill (1).

5, internal screening roller type vertical mill according to claim 1 and 2 is characterized in that: in fine powder chamber (7), be provided with the spreading disk (16) of annular, spreading disk together rotates with mill (1).

6, internal screening roller type vertical mill according to claim 1, it is characterized in that: be coated with liner plate (3) on the mill (1), liner plate is provided with the installing hole (17) that passes for screw, and the upper/lower terminal of this installing hole is provided with the stepped hole that can settle sunk screw.