CN101003025A

CN101003025A - Biconical double impacting flour mill

Info

Publication number: CN101003025A
Application number: CN 200610008424
Authority: CN
Inventors: 朱昆泉; 朱雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-21
Filing date: 2006-01-21
Publication date: 2007-07-25

Abstract

A dual-cone butt-impact pulverizer able to make the raw material to butt-impact with each other in its pulverizing cavity features that said its pulverizing cavity is composed of two truncated hollow cones, which are coaxially butt-arranged and have same rotation speed but different directions and internal guide slots. Its advantages are high effect, and low energy consumption and abrasion.

Description

The bipyramid flour mill that liquidates

Affiliated technical field

The present invention relates to a kind of newly-built pulverizing physical model, and develop material superfine powder grinding machine on this basis with big comminution ratio and obvious energy saving effect.

Background technology

Existing high speed impact flour mill has two big classes with regard to its crushing mechanism, promptly the medium type impacts the gentle power type of flour mill and impacts flour mill.

The basic structure that the medium type impacts flour mill is by Motor Drive, utilizes media such as tup, needle bar to directly act on the material particles under high-speed motion, particle is born repeatedly impact between medium and counterattack liner plate and reaches ultra-fine grinding.Such flour mill version is numerous, and is simplified and traditional different, is widely used.For the production superfine powder, must improve medium velocity, but its maximum permission speed usually is subjected to the restriction of member mechanical strength, impact flour mill as disc type, the limit line speed of tup is no more than 120m/s.In addition, also must in case tup or wear liner cause that the gap increases, will cause mill efficiency greatly to descend the clearance control between tup and the counterattack liner plate in the scope of 1～3mm, product fineness be difficult to meet the demands.Flour mill mill efficiency fluctuation is big because the medium type impacts, and component wear is serious, therefore is only applicable to the brittle material of Mohs' hardness below 3 grades, and product fineness generally can reach 20 μ m.

The aerodynamic force type impacts flour mill and uses compressed air as power source, can be transformed into the speed energy to compression by nozzle, and the high velocity air of ejection drives material particles and quickens, and generation collision mutually becomes crushing energy.The most typical at present airflow milling is that axis is intersected in a bit with several nozzle positioned opposite.Material on the material bed under each nozzle aerodynamic force effect, and pulverize with gas, solid fluidization head-on collision.Nozzle often is designed to subsonic speed or supersonic speed curve, and different jet velocities can obtain corresponding product fineness, generally can reach several microns.In addition, owing to use gas as carrier, medium pollutions such as no metal can be guaranteed product purity.Therefore be applicable to the material superfine grinding that high rigidity and strict control are polluted.At present, the major defect that aerodynamic force type flour mill exists is that the energy consumption of material unit mass is very big, usually needs several Baidu, and even several thousand degree electricity could be produced one ton of superfine powder.This is determined by its grinding mechanism.Promptly at first it is a kind of continuous flow pattern to spray formula aerodynamic model, and the energy that passes to material disperses continuously, and concentration class is not enough, and crush efficiency is low.Secondly, the distance between each nozzle polarizes, and is all shorter, and the static particle that is on the material bed will be very difficult with the interior acquisition of the distance flow velocity identical with air-flow in very short time, often is fully not obtain energy as yet just to bump, and influences crushing effect.The part high velocity air sprays counteracting mutually, causes energy dissipation.

Summary of the invention

1. the bipyramid flour mill that liquidates is pulverized physical model

For impact strength deficiency and the component wear that overcomes the existence of existing mechanical medium type impact flour mill seriously causes problems such as contamination of products, reduce simultaneously existing high energy consumption problem again significantly to spray formula airflow milling, the present invention's newly-built " crushing model ", promptly has discrete boundling, quicken synchronously, the pulverizing physical model of the function that liquidates in opposite directions, its feature is as follows:

1.1 discrete boundling

The moving material stream that enters mill chamber is separated into the boundling unit by distributing device, to strengthen all material particles obtain same order from carrier speed.

Existing mechanical shock is ground and to spray formula airflow milling, material is the fluidization continuous distributed on the material bed, can't guarantee the momentum of all material particles from carrier (tup medium or aerodynamic force stream) the identical magnitude of acquisition.

1.2 quicken synchronously

Specific track---spiral of Archimedes is done motion with uniform acceleration to each material particles along one, and material obtains identical speed in the mode of vehicle-mounted type from carrier, its momentum with

ω linear increment (wherein: m-granular mass, r-particle radius of living in, ω-awl dish angular speed).

Existing mechanical shock is ground and to spray formula airflow milling, material particles obtains the speed energy in the air swept mode from carrier, and there are speed difference in material and carrier, and at the same order of magnitude, random is not strong for the momentum of each particle, poor synchronization.

1.3 liquidate in opposite directions

When the boundling unit of all materials is pulverized near the district through quickening to reach, momentum with linear increment reaches extreme value, and discharged suddenly, moment has very strong whipping effect, bumps with the relative velocity that doubles throwing speed with the material particles that comes in opposite directions and impacts and pulverize.

Existing mechanical shock mill and to spray formula airflow milling, material disperses continuously, and concentration is poor, even the part airflow kinetic energy cancels each other, and causes energy waste, and crush efficiency is low.

2 bipyramids liquidate flour mill structural design and performance evaluation

The technical solution adopted for the present invention to solve the technical problems is: empty frustum of a cone in adopting two, hold in opposite directions horizontally disposed grinding chamber greatly.On the angled direction of inner cavity surface and bus abundant stock guide is set.Two awls are to equate rotating speed, the rightabout rotation.Material enters mill chamber by feed arrangement from the conelet end, moves rapidly to big end along deflector chute.Its tangential velocity is strict to be consistent with cone, and momentum is linear increment.When reaching the auger end, with maximum tangential velocity throwing, with material Shu Xiangxiang from opposed circular cone throwing liquidate take place broken.Smashing fineness does not reach before the requirement, can repeatedly collide repeatedly in mill chamber.The grinding time, then can control by mill chamber inner and outer air pressure difference, after satisfying fineness requirement, get rid of from slit between awl.Gap between two awl dishes should guarantee that material has enough big impact energy when liquidating in opposite directions in pulverizing the district, and can smooth and easy discharge.

Beneficial effect of the present invention is summarized as follows:

Performance, feature are relatively

Sequence number	Project	This case	The disk hammer impacts flour mill	To spray formula airflow milling
Sequence number	Project	This case	The disk hammer impacts flour mill	To spray formula airflow milling	1	Have or not whipping effect (discharging suddenly when energy constantly gathers certain extreme value)	Have	Do not have	Do not have
2	The Changing Pattern of particle momentum increment	Linear increment	Irregular	Irregular	1		Have	Do not have	Do not have
2	The Changing Pattern of particle momentum increment	Linear increment	Irregular	Irregular	3	Pulverize in the district, whether each particle has the momentum of same order	Have	Do not have	Do not have
4	Material particles from carrier obtain speed form, whether quicken synchronously	Vehicle-mounted type, synchronously, it is poor not have speed	Air swept, asynchronous, there is speed poor		3		Have	Do not have	Do not have
4			Air swept, asynchronous, there is speed poor		5	The maximum comminution ratio that the single grinding may reach	≥1000	200	20
6	The feeding coal fluctuation is to the influence of mill efficiency	Little	Greatly	Little	5		≥1000	200	20
6		Little	Greatly	Little	7	Material is to the degree of wear of medium, carrier	Little	Greatly	Little
8	Under the condition of identical production capacity, the institutional investment cost	Low	In	High	7	Material is to the degree of wear of medium, carrier	Little	Greatly	Little
8		Low	In	High	9	The material hardness (Mohs' hardness) that is suitable for	Below 8 grades	Below 3 grades	10 grades
10	The complete machine physical dimension	Little	Greatly	In	9	The material hardness (Mohs' hardness) that is suitable for	Below 8 grades	Below 3 grades	10 grades

Description of drawings

The invention will be further described below in conjunction with drawings and Examples:

Fig. 1 is vertical section, an embodiment of the invention grinding chamber schematic diagram;

Fig. 2 is the A-A cutaway view among Fig. 1;

Fig. 3 is that material is pulverized physical model;

Fig. 4 is that particle is pulverized relative impact principle figure in the district.

Among the figure: 1-awl dish, the left and right sides is opposed; The 2-stock guide; The 3-feed pipe; The 4-power transmission shaft; 5-grinding district; The 6-material particles quickens track---spiral of Archimedes

Among Fig. 4: m ₁, m ₂-granular mass; v _t-the velocity of following; v _r-relative velocity; V-particle throwing speed.

The specific embodiment

In Fig. 1, the big end of two awl dishes (1) is opposed in opposite directions, is on the same horizontal axis, and both ends of the surface are parallel, and both gaps are generally several millimeters.The cone angle size designs according to material characteristic, generally gets 60 °～90 °.Present embodiment is 90 °.Two awl dishes are supported on the power transmission shaft (4) separately by spoke, the axle other end by two independently transmission device and drive motors link, rotating speed can be regulated by electrical system.The present embodiment rotating speed is 2950r/min.

The inner surface of awl dish (1) is equipped with the stock guide (2) of sufficient amount, and its effect is that material is separated into the boundling unit, and directing material moves to big end from small end, to obtain and the synchronous movement velocity of awl dish tangential velocity.The material movement track is spiral of Archimedes shown in (6) among Fig. 3, material momentum increment thereon is

ω (in the formula: r-particle moment radius of living in, ω-awl dish angular speed, ω=const).The maximum momentum that particle has when reaching the stock guide end is mR ω (m-granular mass, the big end radius of R-, ω-awl dish angular speed), and is released suddenly in the end, produces whipping effect, has extremely strong impact energy.The about 80m/s of throwing speed of present embodiment material, the relative impact velocity of particle reaches 160m/s, considerably beyond existing machinery impact flour mill limit velocity (＜120m/s).Model machine and existing high speed impact grinding machine below in conjunction with this case development give comparison with regard to its economic effect.Wherein:

" this case " is the bipyramid flour mill that liquidates.

" 315ZPS " is the impact grinding of disk hammer.

" AFG630 " is to spray formula airflow milling.

Test material: lime stone (calcite), 2.7T/m ³

Economic indicator relatively

Index	This case	315ZPS	AFG630
Index	This case	315ZPS	AFG630	The maximum ratio of reduction output of product fineness feeding granularity Kg/h specific energy consumption Kwh/T	d ₉₅=22 μ m, 600 order 15mm 〉=1,000 2,400 12	d ₉₅=25 μ m, 500 orders, 150 μ m, 100 orders 200 400 75	d ₉₈=20 μ m, 625 orders, 75 μ m, 300 orders 20 700 380

Annotate: the parameter of 315ZPS, AFG630 is all from " the Handbook of Mechanical Processing Technology " of German Alpine company.

Claims

1. flour mill, form by the interior empty frustum of a cone that a pair of structure is identical, it is characterized in that: the big end of two awl dishes is opposed in opposite directions, be in same horizontal axis, rotating speed equates, switched in opposite, and material enters in the awl dish from small end respectively, produce when moving near the big end and liquidate in opposite directions, discharged from two awl dish gaps by comminuting matter.

2. flour mill according to claim 1 is characterized in that: two awl dish inner surfaces are provided with the stock guide of some along generatrix direction, make material be separated into the boundling unit, and move to fire end from small end, during the momentum m that obtains

ω (wherein: m-granular mass, r-particle radius of living in, ω-awl dish angular speed) increases with linearity.

3. according to claim 1 and 2 described flour mills, it is characterized in that: material is a spiral of Archimedes at the movement locus of awl dish inner surface.

4. flour mill according to claim 1 is characterized in that: the gap of two awl dishes should guarantee that material has enough big impact energy when liquidating in opposite directions in pulverizing the district, and can smooth and easy discharge.