CN2772619Y - Grading mill with medium - Google Patents

Abstract

The utility model discloses a grading mill with medium, which comprises a stirring shaft, a milling cylinder, a feed inlet and a feed outlet, wherein the feed inlet and the feed outlet are arranged on the milling cylinder; the stirring shaft is positioned in the milling cylinder; the longitudinal section of the cylinder body of the milling cylinder is in a shape, the lower part is small, the upper part is big, the inner diameter is gradually enlarged and the cross section is in a round shape. The utility model has the advantages that the utility model adopts the shape that the inner diameter of the milling cylinder is gradually enlarged, when material enters the lower part of the milling cylinder, the inner diameter of the milling cylinder is gradually enlarged at the longitudinal direction following the material rising, thereby, the linear velocity is gradually enlarged. Because the speed of the material is changed at the longitudinal direction, the stress of the material is increased, the internal microcracks are increased, and the utility model causes the milling mechanism to act together, such as shearing, extrusion, collision, etc. In fact, the utility model is equivalent to a plurality of devices and a plurality of cyclical milling processes of shearing and extrusion, and shearing and extrusion again and enhances the milling efficiency.

Description

Medium classification mill is arranged

[technical field]

The present invention relates to grind machinery, be specifically related to a kind of medium classification mill that has.

[background technology]

At present, domestic and international widely used powder processing machinery is a ball mill.Traditional ball mill is to utilize the rotation of ball mill staving that thereby the ball milling subband in the staving is arrived the certain height storage power, impacts the effect that material reaches the material pulverizing thereby form impulsive force in the sub-dropping process of ball milling.This powder preparation method equipment is simple, can obtain the satisfactory powder of granularity by the method for lengthening working time, and its another one characteristics are that batch mixing is even.Its remarkable shortcoming is to take up an area of greatly, the energy consumption height, and production efficiency is low, and powder granularity is thick.

In addition, also have traditional ultra-fine equipment, can be classified as medium mill and no medium mill two big classes.Have to comprise stirring mill and vibromill etc. in the medium mill again, be characterized in the product fineness height, output is big, but process of producing product is discontinuous, and Granularity Distribution is not concentrated.Wherein stir mill and form, adopt disposable feeding intake by shaft, cylindrical shell, disposable discharging after grinding is finished, the material fineness is controlled by milling time.Material can be that slurry also can be a dry powder, shaft drives medium and material rotation, material is tapered in the mode of collision friction mutually with medium in cylindrical shell, but because the initial size of material can not be identical, therefore and cylindrical shell mostly is cylindrical, and the suffered applied stress of material is identical with lapping mode in stirring mill, causes the final size distribution of material can not concentrate on a very little scope, be not owe the mill be exactly overground, can not accurately control size distribution.

[summary of the invention]

Purpose of the present invention is intended to overcome above-mentioned the deficiencies in the prior art, propose a kind of can accurately control size distribution, grinding effect excellence, energy consumption low medium classification mill arranged.

The technical scheme that realizes above-mentioned purpose is: a kind of have the medium classification to grind, comprise shaft, mill tube and be arranged at charging aperture and discharging opening on the mill tube, described shaft is positioned at mill tube, and the longitudinal section of described mill tube cylindrical shell is the little down shape that large diameter increases gradually that goes up, and cross section is circular.

Preferably, described charging aperture is arranged on the cylindrical shell bottom, and discharging opening is arranged near the center of cylindrical shell upper end.

Preferably, the longitudinal section of described mill tube cylindrical shell is trapezoidal for what stand upside down.

Preferably, be provided with many group blades on the described shaft vertically, each is organized, and distance equates between the adjacent blades.

The present invention has medium classification mill also can comprise the abrasive media of containing in mill tube, and described abrasive media has rigid body, also is coated with the elastic wear-resisting layer on its rigid body.

Preferably, the material of described elastic wear-resisting layer is the high abrasion resin.

Adopt technique scheme, beneficial technical effects of the present invention is: 1) the mill tube shape that adopts internal diameter to increase gradually, after material enters the mill tube bottom, rising along with material, mill tube internal diameter in the vertical increases gradually, thereby linear velocity increases gradually, material is a speed-change process in the vertical, so the suffered stress of material increases, internal tiny crack increases, make and shear, extruding, machine-processed acting in conjunction is ground in collisions etc., in fact is equivalent to shear extrusion, shear the process of lapping of a plurality of circulations of multiple devices of extruding more again, improved grinding efficiency greatly; And because cross section is circular, it is identical making x wire speed, so the result of its grinding will play the finishing effect to material particles; According to centrifugal principle, bulky grain will be in apart from the farthest, center, stressed maximum, and grinding efficiency is the highest; Otherwise fine grained is in apart from the center the most nearby, and grinding efficiency is minimum, makes the energy reasonable distribution, and is very beneficial for the concentrated distribution of grain diameter.2) discharging opening is arranged near the center of body end surface, because the gap of the centrifugal force thick, that fine grained is suffered from bottom to top increases continuously gradually, consequently fine grained can further be concentrated to the center, overflow from discharging opening near main shaft, thereby it is concentrated to have guaranteed that further the material particles particle diameter distributes, and produces the superfine powder of the narrow particle diameter distribution that has preeminent performance; Charging aperture is arranged on the cylindrical shell bottom, is convenient to control material by the speed that pumps into material and stops the time of grinding in mill tube, the degree of grinding of control material.3) adopt the many groups blade that uniformly-spaced is provided with, can strengthen shearing the effect of collision, improve grinding efficiency.4) adopt trapezoidal cylindrical shell longitudinal section, make material that the vertical line speed of even increase be arranged, grinding effect is preferably highly all arranged at each of whole cylindrical shell, and easy to manufacture on the engineering.5) adopt the abrasive media that is coated with the elastic wear-resisting layer on the rigid body surface, make the rigidity mill be situated between and become elastic fluid, thereby with the material contact process in increased contact area, its mechanism is equivalent to continual in process of lapping material particles applied an external pressure, increase the internal stress of granule interior, help the ultra micro refinement of material more, can improve grinding efficiency greatly; And the coating of elastic layer has reduced the hard damage of particle surface, avoids hard collision and friction between the rigid media to produce micro mist and contaminated material.

Below by embodiment also in conjunction with the accompanying drawings, the present invention is described in further detail:

[description of drawings]

Fig. 1 is a kind of medium classification mill structural representation that has.

[specific embodiment]

A kind of have the medium classification to grind, in conjunction with Fig. 1, comprise shaft 4 and mill tube 5, shaft 4 is positioned at mill tube 5, the equally spaced vertically blade 6 that is provided with on the shaft 4, shaft 4 is driven through reductor 2 by motor 1 and rotates, and can be rotated stirring in mill tube 5, and motor 1 and reductor 2 are arranged on the motor cabinet 3; Mill tube 5 is provided with charging aperture 7 and discharging opening 8, and the cross section of mill tube 5 cylindrical shells is circular, and the longitudinal section is trapezoidal for what stand upside down, and charging aperture 7 is arranged on the cylindrical shell bottom, and discharging opening 8 is arranged near the center of body end surface.

This have medium classification mill to adopt abrasive media and material are mixed stirring method in mill tube carry out grinding of material, the such abrasive media of preferred use among the present invention: have rigid body, also be coated with the elastic wear-resisting layer on its rigid body, the material of this elastic wear-resisting layer is preferably the high abrasion resin.

The concrete course of work: material is added the slurry that water is made solid content 40%-75%, with pump with the charging aperture 7 of material by tangential direction feeder main frame mill tube 5 lower side, main frame mill tube 5 inside drive blade 6 rotation at a high speed by shaft 4, its range of speeds is 600～1400 rev/mins, blade 6 equidistant arrangements, the blade of rotation makes the abrasive media of main frame mill tube inside and material produce powerful centrifugal shearing force and impact force, slip rises to top exit 8 by the main frame bottom along hand of helix under certain pressure, in the mode of working continuously, to pulverize, ultra-fine, classification is finished in same operation, changed traditional batch process, so both simplified production process, cut down the consumption of energy greatly again, and Granularity Distribution is narrow.

Experimental example:

1) (rutile type titanium white is produced in Sichuan, and granularity is D90＜60 μ m, 200 kilograms with ceramic glaze; 1300 kilograms of feldspars, granularity are D90＜50 μ m) mix after, add the mixed slurry that water is made solid content 50%;

2) with above-mentioned slurry and 4.5 kilograms of dispersant (9000 types, Rhom and Hass produces) mix, carry out ultra-fine processing contrast experiment in order to following equipment respectively, the ultra micro thinning effect of representing powder with the size distribution of powder after laser particle size analyzer (JL1001 type, instrument research institute in Dandong produces) the measurement refinement;

A, ball mill (MQYG900*900 type, Liming Road ﹠ Bridge Heavy-Duty Industry Co., Ltd., He'nan Prov. produces): disposable feeding intake, start was ground 15 hours continuously, shut down, and took out material, and sampling is surveyed granularity, D90＜45 μ m.

B, stirring mill (SX type, the prosperous powder machinery Co., Ltd that reaches of Wuxi City produces): disposable feeding intake, the start grinding is 4 hours continuously, shuts down, and takes out material, and sampling is surveyed granularity, D90＜5 μ m.Dmax＝10μm。

C, the present invention have medium classification mill: continuous feed, discharging continuously in the discharging opening sampling, is surveyed granularity, D90＜0.5 μ m.Dmax＝1.6μm。

By The above results as can be seen, the present invention has medium classification grinding tool that excellent grinding effect is arranged.

Claims (9)

1, a kind of have the medium classification to grind, comprise shaft, mill tube and be arranged at charging aperture and discharging opening on the mill tube, described shaft is positioned at mill tube, it is characterized in that: the longitudinal section of described mill tube cylindrical shell is the little down shape that large diameter increases gradually that goes up, and cross section is circular.

2, according to claim 1 have the medium classification to grind, and it is characterized in that: described charging aperture is arranged on the cylindrical shell bottom, and discharging opening is arranged near the center of cylindrical shell upper end.

3, according to claim 1 have the medium classification to grind, and it is characterized in that: the longitudinal section of described mill tube cylindrical shell is trapezoidal for what stand upside down.

4, according to claim 2 have the medium classification to grind, and it is characterized in that: the longitudinal section of described mill tube cylindrical shell is trapezoidal for what stand upside down.

5, described medium classification mill arranged according to any one of claim 1～4, it is characterized in that: be provided with many group blades on the described shaft vertically, each is organized, and distance equates between the adjacent blades.

6, described medium classification mill arranged according to any one of claim 1～4, it is characterized in that: also comprise the abrasive media of containing in mill tube, described abrasive media has rigid body, also is coated with the elastic wear-resisting layer on its rigid body.

7, according to claim 5 have the medium classification to grind, and it is characterized in that: also comprise the abrasive media of containing in mill tube, described abrasive media has rigid body, also is coated with the elastic wear-resisting layer on its rigid body.

8, according to claim 6 have the medium classification to grind, and it is characterized in that: the material of described elastic wear-resisting layer is the high abrasion resin.

9, according to claim 7 have the medium classification to grind, and it is characterized in that: the material of described elastic wear-resisting layer is the high abrasion resin.

Images