CN85106019A

CN85106019A - Annular gap type ball grinder

Info

Publication number: CN85106019A
Application number: CN198585106019A
Authority: CN
Inventors: 彼德·费比恩; 卡尔-海因茨·霍夫曼
Original assignee: Reimbold und Strick GmbH and Co
Current assignee: Reimbold und Strick GmbH and Co
Priority date: 1985-08-27
Filing date: 1985-08-27
Publication date: 1987-02-25
Also published as: ZA867607B; GR3000094T3; ATE43798T1; FI863754A; CN85106019B; EP0219740B1; ES2001716A6; CA1244393A; DE3536454A1; DD250062A5; FI81731B; DE3663778D1; BR8604966A; EP0219740A3; CN86106362A; CN1007212B; AU581777B2; AU6171986A; EP0219740A2; KR870003822A

Abstract

The present invention is about a kind of annular gap type ball grinder that is used in continuous pulverizing hard mineral aggregate especially, it consists of: a mill shell that makes progress, tegmentum is covered with, a rotor is housed in the middle of them, the outer surface of rotor and the inner surface of mill shell all are taper seats, and the gap that grinds between two taper seats is communicated with charging aperture, and the bead that grinds usefulness also is present in and grinds in the gap, the inner surface of the shape press cover at the top of rotor is made, and is communicated with discharging opening.The feature of annular gap type ball grinder is that the inner surface of rotor top and lid all is conical, and the upper end open that there is a doughnut in the annular discharging gap of Xing Chenging between the two, the maximum gauge place of its lower end and grinds the gap communicates.

Description

Annular gap type ball grinder

The present invention is about a kind of annular gap type ball grinder that is used in particular for pulverizing continuously the hard mineral aggregate, and it consists of; A mill shell that makes progress, be covered with by a lid, a rotor is housed in the middle of them, the outer surface of rotor and the inner surface of mill shell all are the garden conical surfaces, the gap that grinds between the two garden conical surfaces is communicated with charging aperture, the bead that grinds usefulness also is present in and grinds in the gap, and the inner surface of the shape press cover at the top of rotor is made, and is communicated with discharging opening.

Hard mineral aggregate (Mohs' hardness＞5) is as corundum, zirconium dioxide, and alumina, carborundum etc., one to pulverizing in ball mill with iron ball.Not only long processing time, and every parts that touch mineral aggregate and iron ball, it is very fast to wear and tear.Have, the noise in ball mill when operation is ear-piercing too again, more have, the iron filings of above-mentioned ball mill iron ball wearing and tearing are mixed in the abrasive material, handy chemical method is its flush away, this install not only complexity but also expensive.

Above-mentioned annular gap type ball grinder (German patent publication No. 2848479) is planned to be used for improveing traditional ball mill, but it not too is suitable for the hard mineral aggregate is ground, and it only is suitable for pulverizing quite soft mineral aggregate such as chalk etc.This is to cause because grind the character that grinds in the gap with ball.

When abrasive material and grind mix with ball entered from the charging aperture of bottom (or from the quill shaft of rotor by top) grind the gap after, ball is being pushed away by the pressure of feed pump during beginning, rotation along with rotor, move on top towards the annulus, but therefore they just do not exist milling action because the gravity effect has just avaled during the hypotension of pump on the top that grinds the gap.This is certainly with the pressure of strengthening pump or strengthen the abrasive material flow and keep grinding with ball and be in the top that grinds the gap.But do the danger that ball and material are discharged from together like this, thereby output is descended.Experience shows when using average abrasive material flow to work, have only the gap that grinds of Lower Half to be fully utilized, thereby resulting output has also only realized half theoretically.Say again, grind high density in the bottom that grinds the gap, make very quick-wearing of rotor surface and mill shell inner face with ball.Rotor even can be stuck, especially when rotor and feed pump of short duration left alone without help once the time.This danger of the annular gap type ball grinder of above-mentioned design, certainly the way with dress blade on the rotor solves, but do like this another shortcoming of annular gap type ball grinder is more protruded, promptly grind with ball and do not avaling, but along with abrasive material together by pump to outlet, so do not produce milling action yet.And blade is by ball and material wearing and tearing soon.Sometimes adopting grid that ball is stayed in grinds in the gap; Yet grid can influence the discharge of abrasive material, sometimes in addition can because ball and material be obstructed at all can't discharging stage.

In above-mentioned annular gap type ball grinder, should guarantee that the abrasive flows by grinding the chamber is stable, for this reason, employing is established a high relatively collecting chamber at rotor top, this collecting chamber is formed by the intrados of the lid of the convex surface of rotor top and mill shell correspondingly, collecting chamber and discharging opening directly communicate, and this collecting chamber can not work to grinding grinding with ball in the gap.

The difficult starting of rotor is owing to grind to concentrate on ball and be bordering on the bottom that vertical annular grinds the gap and cause with wear trace on rotor and the mill shell, in order to prevent it, design according to another annular gap type ball grinder (DE-OS 3022809), its rotor and mill shell grind the gap on demand by axial withdrawal with increase.For this reason, thus needing complicated technology to measure causes apparatus expensive.Yet, in grinding the gap, grind the service efficiency with ball, also promptly in operating process the whole utilization rate that grinds on the gap length have only slight raising.In fact, grind grinding with ball in the gap and outwards be directed to along with abrasive material downwards downward, being unlike in the sort of grinding upwards has a kind of counter-force that makes progress in the gap, so grinding in the gap in this section, operating efficiency is inadequate.

Another kind of known its composition of annular gap type ball grinder (DE-OS 2811899) is that an abrasive material holder is arranged, its inner surface forms and grinds the chamber, insert a taper cam body in grinding the chamber, the inner surface of abrasive material holder and that cam body are annular bipyramid designs.According to further possible enforcement, can be coarse or can have protrusion recessed facing to each face that grinds the chamber, as muscle, groove, pin or the like.Yet, when the processing rigid abrasive material, will cause intolerable wearing and tearing.No matter annular gap type ball grinder itself or above-mentioned all special designs all can not solve the problem of pulverizing the hard mineral aggregate.

In contrast, the present invention is improved above-mentioned various annular gap type ball grinders, makes to grind to grind in the gap with the efficient of ball to improve, even can be economical and pulverize the hard mineral aggregate perfectly.

Problem is solved like this, and promptly the top of rotor and lid are all made taper, form an annular discharging gap, and the maximum gauge place of its lower end has a doughnut and the upper end open that grinds the gap to communicate.

Because the such design of annular gap type ball grinder, can pulverize various hard mineral aggregates such as corundum economically, zirconium dioxide, alumina, carborundum etc., because grinding whole length in gap all grinds with ball in the performance milling action, the suction that hydrodynamics that obtains owing to the design at cone rotor and top thereof and centrifugal force produce, counteracting grinds the gravity with ball, prevent that them from sinking to the bottom in grinding the gap, they absolutely are utilized in attrition process, even rotor changes very slowly, grinding is all distributing to grind on the whole length in gap and the width uses ball.In addition, discharge from outlet together as ball and material, then the quantity of ball or grind effect and will lower produces significantly influence.

Therefore, in the doughnut that grinds gap upper end radial arrangement, be equipped with and give additional the grinding of calculating earlier and use ball, also promptly form a stockade layer at rotor maximum gauge place, make to grind to stay to grind in the gap, but do not stop the chippy material that grinds in the gap to flow to discharging opening like that like grid with ball.Abrasive material moves up from doughnut, by the narrow discharging gap between rotor top and the lid, leads to discharging opening, not facts have proved any grinding with spherical zone gone out, and therefore ensuing operation of one abrasive material being separated with ball just can have been fallen by saving.Even the width in discharging gap is bigger than the diameter that grinds with ball, grind with ball and also can be with up by the discharging gap because they since gravity or action of centrifugal force stay in the doughnut of radial arrangement.The residence time of annular gap type ball grinder of the present invention is longer, so the garden circular velocity used of rotor and the capacity of feed pump can hang down.Move up at the abrasive material that grinds with between the ball, the granule size of abrasive material differs very little very slowly.Annular gap type ball grinder of the present invention is particularly suitable for using ball with grinding of different size; The thick part of the ball of thick weight in grinding the lower part processing abrasive material in gap, the tiny part of thin light ball in grinding the upper part processing abrasive material in gap is because centrifugal force accelerates the rising of particulate.Because material sufficiently long residence time in grinding the gap, hard material is ground into the powder of required thickness soon and is discharged continuously.Owing to grind pack completeness higher in the gap, the energy of supplying with rotor can be utilized better, makes that the use of annular gap type ball grinder is more economical.

According to outstanding embodiment of the present invention.The shape of the shape of rotor top and the inner surface of lid is the butt taper.

Grind gap and discharging gap and preferably all be made up of two parallel edges, the former is wider than the latter.Yet,, grind other embodiment of the optional usefulness in gap and discharging gap for pulverizing the hard mineral.

Grinding the gap can be to enlarge at the top, and the discharging gap is two parallel edges.Have again, grind gap and discharging gap and can be at the top and enlarge, perhaps grind the gap and be and enlarge at the top and the discharging gap is to enlarge in the bottom.In various examples and the doughnut of this opposite taper connection of rotor top, play a part to grind barrier layer with ball, prevent that useful grinding with ball is discharged from from grind the gap.

Doughnut preferably is disposed in the area that is connected of mill shell and lid, like this, after lid is opened, can take out to grind from the first half of chamber and use ball.The bore of doughnut can hold all to grind at least uses ball, in grinding the gap, pile abrasive material after, put into from above respectively grinding again with ball, can prevent from extraly to grind like this to sink to the bottom that grinds the gap with ball.Having, is the feeding abrasive material annular gap type ball grinder that will pulverize easily again, because above-mentioned abrasive material does not need as before and grind with ball to mix.

The favourable part of another one is that doughnut is two parallel one section protruding gardens that adds most peripheral basically.Because this shape, this chamber is used to spherical make wearing and tearing each other all reduce to minimum when grinding with ball.

The ratio that overhead height and rotor add the total height at top is 0.2 to 0.5: 1.Promptly be that the top is shorter than rotor.The rotor male cone (strobilus masculinus) is 40 ° to 85 ° to the proper angle of vertical line, preferably 60 ° to 80 °, and 70 ° to 80 ° of special circumstances.The gradient of rotor cone angle is that the kind by its hard material that will pulverize decides, and the gradient of top cone angle is then decided by the ratio of its height and height overall.

The outer surface at the inner surface of mill shell and lid and rotor and top thereof is the same should to be the surface of fine oil stone shape, promptly neither light very, and neither be very thick.This fine oil stone shape available suitable coating to the surface in surface reaches, and for example, prevents corrosion and wearing and tearing with polyurethane as protective layer.In order to prevent temperature rise, rotor can be at inner ventilation.Moreover mill shell and Gai Douke add water jacket.

Enforcement of the present invention is illustrative in the accompanying drawings.

Fig. 1 is vertically analysing and observe of annular gap type ball grinder,

Fig. 2,3 and 4 illustrate and have the different annular gap type ball grinders that grind gap and discharging gap design and vertically analyse and observe.

Annular gap type ball grinder 1 is suspended on the arm 11 of optional support 10, and the basic composition part has; Fixing frustoconical mill shell 12, and a frustoconical rotor 13, the smooth connection of downward major part at its major part that makes progress and frustoconical top 14, the aspect ratio rotor 13 at top 14 is little.On mill shell 12, adorn a removable lid 15, the tapering that matches with top 14 is being arranged, keeping a small distance between the two.The upper end at top 14 connects a vertical axis 16, in order to support rotor 13 and top 14, makes its energy in mill shell 12 free movable, simultaneously the driving force of motor 17 is passed to top 14 and rotor 13.On the total inner surface of mill shell 12 and lid 15 the

antiwear liner

18,19 of anticorrosion is arranged, liner is a polyurethane, surface with fine oil stone shape, the outer surface at the outer surface of rotor 13 and top 14 all has corresponding fine oil stone shape surface, for clear, does not draw.

Grind gap 20 by an annular of being made up of two parallel walls between the inner surface of the outer surface of rotor 13 and mill shell 12, the horizontal clearance 22 by 13 two of mill shell 12 and rotors between flat is communicated with the abrasive material charging hole 21 that is positioned at bottom center.

Also be the discharging gap 23 that two parallel walls are arranged, be positioned at top 14 and lid 15(or its lining 19) between.The width in above-mentioned gap is little than the width that grinds gap 20 all on the total height at top 14.The lower end of upright taper discharging 23 and the upper end that back taper grinds gap 20 extend into doughnut 24, and doughnut 24 is lined with

liner

18 and 19 basically.Two planomurals up and down of doughnut 24 are parallel to each other.The outer face 25 of doughnut 24 is protruding garden arc.Doughnut 24 is positioned at and covers 15 and the bonding pad of mill shell 12, open it, as long as lid has been removed.In bonding pad 26, inserting a cushion block 27, it is being changed into other thickness just can change the width that grinds gap 20, the relative position of mill shell 12 and rotor 13 is changed up and down.Can enter doughnut 24 by the opening 28 on the flange of lid.When rotor 13 and top 14 when rotated, again by charging aperture 21 from following the hard mineral aggregate is sent into grind the gap after, can pass through above-mentioned opening 28, go grinding to send into to grind in the gap 20 with ball.

The flange 30 of the side of axle 16 and lid 15 has formed discharge chamber 29.On the wall of above-mentioned in addition part 30 discharging opening 31 is arranged, from discharging gap 23, be pressed into discharge chamber 29 by levigate material, just go out by discharging opening 31.The upper end of part 30 has cover plate 32,33 to form the ventilation crack in addition.

Mill shell quilt cover 34 is wrapping, and on the cover 34 cooling water inlet 35 and coolant outlet 36 is arranged.

Equally, cover 15 quilt covers 37 and wrapping, cooling water inlet 38 and coolant outlet 39 are arranged on it.

When annular gap type ball grinder 1 was driven, motor 17 at first got up rotor 13 and top 14 rotations.Then abrasive material (bulk cargo) is sent into by charging aperture 21 and is ground gap 20, then, add to grind by opening 28 and use ball, it is with doing with the abrasive material identical materials, guarantee to grind so can not pollute abrasive material, thereby obtain the high-purity of product with the broken end of wearing and tearing on the ball.Grinding the maximum garden circular velocity of 20 upper ends, gap, is because the cause of rotor 13 and its top 14 tapers obtains, and produces a kind of suction that makes progress thus, and anti-grinding with ball sinks to the bottom in grinding gap 20.Be placed with grinding of many Yu amounts and use ball in doughnut 24, this has just formed the stockade layer, discharges from grind gap 20 thereby prevent to grind with ball.Owing to grind to be full of in the gap 20 to grind and use ball, absolutely play milling action so grind the gap, when abrasive material remain in grind in the gap 20 during this period of time in, be subjected to the maximum rate of hitting that weighs that grinds.Grind with ball when may wear to its size and can enter discharging gap 23, can be got rid of into by centrifugal force and go in the doughnut 24, use ball, therefore can be used as the finished product use so from export 31 powders of discharging, grind, do not need to add again wash or sieve etc. after connect processing.

Grind with ball and prevented deposition reliably in grinding the gap, rotor is starting difficulty or stuck problem never again.Therefore, the wearing and tearing of each other part are also just relatively low.Because can regulate material in the residence time that grinds the gap with the garden of selection circular velocity and the width of selecting to grind the gap, the processing of hard mineral aggregate can the low consumption high yield.The granularity of pulverizing is ground the influence with the ball size, so in case of necessity can be pulverizing with the ball different size dimensions of hanking, can obtain the crushing effect of segmentation like this, because thick grinds with the ball many places in the bottom of annular gap type ball grinder, be responsible for grinding coarse fodder, and thin grinding with the ball many places pulverized fines in top.

Fig. 2,3 and 4 enforcement illustrates annular gap

type ball grinder

2,3, and 4 structure is the design according to Fig. 1 basically.Only the improvement of may making that grinds gap and discharging gap is drawn with profile, be applicable to and pulverize various hard mineral aggregates.More than in the various examples, the doughnut 24 of radial arrangement is to be used for putting grinding with the barrier layer of ball, this chamber is positioned at and

grinds gap

20a, 20b, 20c and

discharging gap

23a, 23b, the interface point of 23c.Above-mentioned interface point is exactly rotor 13a basically, 13b, 13c and top 14a, 14b, the big garden contour between the 14c.

In the example of Fig. 2, grind gap 20a and upwards enlarge, and the both sides of discharging gap 23a are parallel.

The top that grinds gap 20b among Fig. 3 is bigger than the bottom, and discharging gap 23b upwards enlarges.

Fig. 4 shows another kind of enforcement, and it grinds gap 20c and upwards enlarges, and just as grinding

gap

20a and 20b, and discharging gap 23c is communicated with doughnut 24 up-small and down-bigly.

Rotor 13,13a, 13b, the inclination angle on 13c surface with respect to vertical line, preferably 70 ° to 80 °, can be obtained the best like this and grind effect.

Claims

1, be used for pulverizing continuously the annular gap type ball grinder of hard mineral aggregate, it is characterized in that:

A mill body case (12) that makes progress, tegmentum (15) is covered with,

In this mill body case (12), a rotor (13) is arranged, it has the outer surface of taper, the inner surface of mill body case (12) also is taper, and this surfaces externally and internally forms grinds gap (20) and charging aperture (21) communicates, and the bead that grinds usefulness also is present in this and grinds in the gap (20).

The inner surface of the shape press cover (15) at the top (14) of rotor (13) is made, and is communicated with discharging opening (31).

Top (14) and this lid (15) of this rotor (13) all are tapers, form an annular gap (23), and the upper end open that there is a doughnut (24) at the maximum gauge place of its lower end and grinds maximum gauge place, gap (20) communicates.

2, according to the annular gap type ball grinder in the claim 1, it is characterized by, the shape of the inner surface of top (14) and lid (15) all is a butt garden awl.

3, according to the annular gap type ball grinder in the claim 1, it is characterized by, grinding gap (20) and discharging gap (23), all to be designed to both sides parallel, and it is wideer than discharging gap (23) to grind gap (20).

4, according to the annular gap type ball grinder in the claim 1, it is characterized by, grind gap (20) and upwards enlarge, discharging gap (23) are that both sides are parallel.

5, according to the annular gap type ball grinder in the claim 1, it is characterized by, grinding gap (20) and discharging gap (23) all is upwards to enlarge.

6, according to the annular gap type ball grinder in the claim 1, it is characterized by, grind gap (20) and upwards enlarge, discharging gap (23) upwards receive little.

7, according to the annular gap type ball grinder in the claim 1, it is characterized by, doughnut (24) is the bonding pad at mill body case (12) and lid (15).

8, according to the annular gap type ball grinder in the claim 1, it is characterized by, doughnut (24) has an opening (28) at least and uses ball so that put into to grind.

9, according to annular gap type ball grinder in the claim 1, it is characterized by, doughnut (24) has the peripheral end face of two parallel limits and a convex arc in fact.

10, according to the annular gap type ball grinder in the claim 1, it is characterized by, the height of top (14) and rotor (13) add the ratio 0.2: 1 to 0.5: 1 of top (14) total height.

11, according to the annular gap type ball grinder in the claim 1, it is characterized by, the taper appearance of rotor (13) and the angle of vertical line are 40 ° to 85 °, desirable 60 ° to 80 °, in particular cases get 70 ° to 80 °.

12, according to the annular gap type ball grinder in the claim 1, it is characterized by, the inner surface of mill shell (12) and lid (15), and the outer surface of rotor (13) and its top (14) all are fine oil stone shape surfaces.

13, according to the annular gap type ball grinder in the claim 1, it is characterized by, the upper end of discharging gap (23) links to each other with discharge chamber (29), and discharge chamber (29) links to each other with discharging opening (31) again.

14, according to the annular gap type ball grinder in the claim 1, it is characterized by, on mill shell (12) and the lid (15) cooling jacket is housed all.