CN101801532B

CN101801532B - Stirrer mill

Info

Publication number: CN101801532B
Application number: CN2007801002746A
Authority: CN
Inventors: N·施特尔
Original assignee: Gebr RUEHLER AG
Current assignee: Gebr RUEHLER AG
Priority date: 2007-08-17
Filing date: 2007-08-17
Publication date: 2012-06-27
Anticipated expiration: 2027-08-17
Also published as: EP2178643A1; EP2178643B1; ES2356855T3; DE502007006343D1; CN101801532A; WO2009024159A1; ATE495819T1

Abstract

A stirrer mill comprises a grinding vessel (2) and a stirring shaft (5) arranged such that it can be driven to rotate therein. Mounted at the end of the stirring shaft (2) is a last stirring disc (17) on which is mounted a substantially cylindrically shaped cage (19) having perforations (20). Inside the cage (19) is arranged a screening device (23). The distance between a second-last stirring disc (14) and the last stirring disc (17) is such as to form a braided flow (32) while avoiding a preclassification of grinding material on the one hand and grinding aids (31) and coarse grinding material particles on the other hand. In the last stirring disc (17) are formed openings (22) through which the grinding material together with the grinding aids (31) enters an annular gap (28) which is formed by the last stirring disc (17) and an intermediate wall (27) coupled fixedly in rotation therewith. The grinding aids (31) and the coarse grinding material particles are separated inside the separating chamber (21) formed by the last stirring disc (17) and the cage (19).

Description

Agitation grinder

Technical field

The present invention relates to a kind of agitation grinder.

Background technology

Agitation grinder by the known a kind of the type of EP 0 751 830B1.In this agitation grinder, last agitator disk and the distance between the adjacent agitator disk that are supporting cage are significantly less than remaining agitator disk distance each other.Reason is; Except that last agitator disk; The size of the distance between the agitator disk forms so-called braided flow moving promptly for making it possible to; Because the tangential momentum that applies of agitator disk is contiguous at agitator disk, abrasive material together with the grinding aid medium to outflow; In the central region between adjacent agitator disk, abrasive material and grinding aid medium reflux towards shaft.Moving in order to form aforesaid braided flow, the distance between the adjacent agitator disk must be enough big.This distance also can define through the so-called angle of departure/angle (Trennwinkel) folded between two lines.Wherein, line between the radial inner end on the shaft, extending at agitator disk.Another line parallel extends in the axis of shaft.Moving in order to form this braided flow, the angle of departure should be between 30 ° and 60 °.---comprising the abrasive material particle that does not fully grind as yet---in order to make the grinding aid medium separates with abrasive material well; Distance between last agitator disk and the adjacent agitator disk is significantly reduced, so that moving and carry out primary dcreening operation at the upstream end of separator through avoiding forming braided flow.To realize that thus the rough lapping composition granule that most of at least grinding aid medium Buddhist monk does not fully grind can not get into separator, carries out the secondary separation of remaining grinding aid medium and rough lapping composition granule then in this separator.This has such shortcoming, i.e. these measures make that effectively the grinding space reduces and total separated region increase.

By the known a kind of agitation grinder with the grinding container that surrounds grinding chamber of EP0700723A, wherein abrasive material input port and abrasive material outlet are arranged on the same end of grinding chamber.In grinding chamber, be provided with the shaft of rotatable driving, on this shaft, be provided with agitator disk with the spacing that equates to each other.The agitator disk of contiguous abrasive material outlet is provided with the cylinder that has the break-through groove.In this cylinder, be provided with the slotted screen that is arranged in the abrasive material outlet upper reaches.Between agitator disk and the contiguous grinding container lid seen from the abrasive material flow direction at last, be provided with bigger free space, access road leads in the backward channel that is formed on the shaft from this free space.On the agitator disk of contiguous slotted screen, steering wheel is installed, this steering wheel forms a slit with contiguous agitator disk.Backward channel feeds in this slit.Abrasive material is being carried the grinding aid medium secretly and is being flow through grinding chamber from the abrasive material input port, in grinding chamber, in known manner abrasive material is ground and disperses.In the bigger free space between in the end an agitator disk and contiguous grinding container cover; Abrasive material flows in the slit between the agitator disk that flows into steering wheel and vicinity in the backward channel and through this backward channel, and the abrasive material that the grinding aid medium is outwards centrifugalized out and got into again in the grinding chamber in this slit is carried secretly and got back in the milled processed process.

Summary of the invention

The objective of the invention is; Design the agitation grinder of this type like this; Make it possible to carry out grinding and the dispersion treatment of greater strength and can not increase the length of whole device, realize the grinding aid medium simultaneously and grind the better of inadequate rough lapping composition granule and separate.

According to the present invention, this purpose realizes that through a kind of agitation grinder this agitation grinder has:

-grinding container,

--said grinding container surrounds a grinding chamber,

--abrasive material enters the mouth at one end that portion feeds in the said grinding container,

--the abrasive material outlet in the other end from said grinding container pass-out, and

--said grinding container receives assistant research fellow's medium,

-being arranged in the agitator in the said grinding chamber, said agitator has:

--have shaft axis, that can be driven in rotation,

--diameter is last agitator disk of b ', and said last agitator disk is installed on the said shaft and is adjacent to said abrasive material outlet, and

--diameter is the agitator disk of b, and said agitator disk is installed on the said shaft, is arranged on the axial upstream place of said last agitator disk, separates each other with axial distance a,

--upper reaches agitator disk wherein adjacent one another are is confirmed an angle of departure α, and said last agitator disk and adjacent agitator disk are confirmed an angle of departure β,

--wherein each angle of departure α, β are formed with the line that is parallel to said axis by the line between the outward flange of a radial inner end on the said shaft and an adjacent agitator disk of an agitator disk, and

--wherein satisfy: 30 °＜α＜60 °,

-being arranged in the grinding aid media separating apparatus at the said abrasive material outlet upper reaches, said separator has:

--be arranged in said abrasive material discharge the tight-lipped upper reaches screen device and

--on said axis direction, surround the cage of said screen device, said cage is fixedly connected with said last agitator disk and has a penetrating part radially, and

-being formed on the passage in said last agitator disk with being adjacent to said shaft, said passage feeds in the separator,

Angle of departure β between said last agitator disk and the adjacent agitator disk also satisfies: 30 °＜β＜60 °,

In said separator, between said last agitator disk and said screen device, be furnished with midfeather, said midfeather is anti-not to be connected with said agitator rotationally with respect to said agitator rotationally and to extend at least the diameter d above said screen device.

Through measure of the present invention, make grinding and the dispersion treatment that in the end also can carry out big intensity between the agitator disk and adjacent agitator disk, wherein in this zone, also can form and carry out the required braided flow of said processing and move.Grinding aid medium and being separated in the separator of rough lapping composition granule of fully not grinding are carried out.The midfeather that rotates together along with shaft prevents grinding aid medium and rough lapping composition granule and the cover plate generation axial impact that seals screen device, and makes abrasive material and grinding aid medium carry towards cage with high radial velocity.The penetrating part that the coarse granule that grinding aid medium Buddhist monk does not fully grind passes in the cage basically radially centrifugalizes, and discharges around the outward flange deflection of midfeather and through sieve in cage through the abrasive material of the dispersion of fine grinding.Following improvement project according to the present invention strengthens these effects:

Relation for the diameter d of the diameter c of midfeather and screen device satisfies: c >=d;

Midfeather extends to closely near said cage always;

Between midfeather and last agitator disk, be provided with distance piece;

Last agitator disk apart from next-door neighbour's agitator disk apart from a ' equal all upper reaches agitator disk each other apart from a.

According to another improvement project of the present invention, upper reaches agitator disk is provided with opening, and last agitator disk is provided with depressed part this last agitator disk on a side of said adjacent agitator disk.Through this improvement project, will realize more highlightedly: it is moving in the end also to occur described braided flow between an agitator disk and the adjacent agitator disk, thereby can carry out the same big milled processed between intensity and the upper reaches agitator disk.Following improvement project according to the present invention has identical purpose: depressed part has the cross section identical with opening; The diameter b of all agitator disks, b ' equate.

Another improvement project according to the application makes abrasive material pass completely through in the gap between passage last agitator disk of input and the midfeather together with the grinding aid medium with conventional concentrations; In this improvement project, Channel Design becomes the rotation direction ground against shaft to extend towards midfeather.

Description of drawings

From the following explanation of the embodiment of the invention being carried out with reference to accompanying drawing, can learn of the present invention other

Characteristic, advantage and details.In the accompanying drawing:

Fig. 1 illustrates the schematic side elevation that the part of agitation grinder is cut open,

Fig. 2 illustrates first embodiment of the exit region of agitation grinder,

Fig. 3 illustrates second embodiment of the exit region of agitation grinder,

Fig. 4 illustrates the perspective view of agitator disk,

Fig. 5 illustrates the perspective view of last agitator disk with cage,

Fig. 6 illustrates another embodiment of agitator disk,

Fig. 7 illustrates the perspective view of another embodiment of last agitator disk with cage, and

Fig. 8 illustrates the cut-away section of last agitator disk that the cutting line VIII-VIII in Fig. 7 cuts open.

The specific embodiment

Agitation grinder shown in the accompanying drawing has frame 1, and grinding container 2 removably is fixed on this frame.In this frame 1, be provided with drive motors 3, this drive motors drives the shaft 5 of agitator 6 through belt driver 4.Shaft 5 is bearing in the bearing 7 with rotating mode in frame 1.In grinding container 2, especially on the end relative with frame 1 of grinding container, shaft 5 is not supported, that is, be bearing in the frame 1 to shaft 5 cantilevereds.

With respect to frame 1 sealing, shaft 5 passes this cover piece to grinding container 2, wherein seals through shaft seal 9 to realize through cover piece 8.In the zone of cover piece 8, abrasive material inlet 11 feeds in the grinding chamber 10 that is surrounded by grinding container 2.Abrasive material outlet 13 grinding container 2 with abrasive material bottom 12 pass-outs of 11 relative ends that enter the mouth from the sealing grinding chamber.

The stirring tool that is designed to agitator disk 14 forms is installed on the shaft 5 as the part of agitator 6, wherein has opening 15 in the outer peripheral areas of agitator disk 14.Between the adjacent agitator disk 14, all identical on axis 16 directions of shaft 5 apart from a.The agitator disk 14 that only is close to cover piece 8 from the distance of cover piece 8 less than this apart from a.

As shown in Figure 2, last agitator disk 17 of the adjacent bottom 12 of agitator 6 is fastened on the shaft 5 by means of trip bolt 18.This agitator disk 17 equals the axial distance a between aforesaid, each adjacent agitator disk 14 from penult agitator disk 14 adjacent, agitator 6 apart from a '.The diameter b of the diameter b of all agitator disks 14 and agitator disk 17 ' also equate.

Tubular cage 19 is formed on the periphery of last agitator disk 17, and this tubular cage can form with last agitator disk 17.Said cage has a plurality of penetrating parts 20 that are distributed on its periphery.Passages 22 in last agitator disk 17, that be formed on shaft 5 vicinities feed in the separation chamber 21 that is surrounded by agitator disk 17 and cage 19.

In separation chamber 21, screen device 23 is to be arranged on the bottom 12 with axis 16 concentric modes.Screen device 23 is especially so that this screen device 23 is installed on the bottom 12 in the mode that after pull down bottom 12, can outwards be pulled out.That is screen device 23 is connected with grinding container 2 with not rotatable mode.Abrasive material outlet 13 leads to the outside from the inner space 24 of screen device 23.Screen device 23 can form through the mutual in known manner annular disk with little spacing setting on its cylindricality periphery.Thereby the inboard of agitator disk 17, cage 19 and screen device 23 form separator 25.Be adjacent to agitator disk 17, screen device 23 has the cover plate 26 of sealing.Thereby the inner space 24 of screen device 23 only is connected with separation chamber 21 via screen device 23.

On agitator 6, between agitator disk 17 and cover plate 26, be furnished with the midfeather 27 of sealing, this midfeather rotates and has defined gap 28 together along with agitator 6.Though this midfeather is fastened on the shaft 5 by means of trip bolt 18 in according to the embodiment of Fig. 2, midfeather 27 ' directly is fixed on the agitator disk 17 by means of the wing distance piece 29 that distributes around periphery in according to the embodiment of Fig. 3.This midfeather 27 and 27 ' extends beyond cover plate 26 separately diametrically at least, promptly satisfies: c >=d, and wherein c is the diameter separately of midfeather 27 or 27 ', and d is the diameter of cover plate 26.Preferably, c＞d, wherein corresponding midfeather 27 ' extend in the very near distance of cage 19 always.

Be with difference according to the embodiment of Fig. 3 according to the embodiment of Fig. 2; In agitator 17 ' on a side of adjacent agitator disk 14, be formed with agitator disk 14 in opening 15 have identical shaped one side closed depressed part (Vertiefung) 30; Said depressed part has the cross section identical with opening 15, but does not feed in the separation chamber 21.

As shown in Figure 4, the opening 15 in the agitator disk 14 can have circular cross section.Therefore the one side closed depressed part 30 in the agitator disk 17 ' correspondingly is designed to circle, and is as shown in Figure 5.

According to Fig. 6, the opening 15 ' in the agitator disk 14 can have and is similar to the trapezoidal cross section of outwards widening.For the one side closed depressed part 30 ' in the corresponding agitator disk 17 ' also is so, as shown in Figure 7.

Working method is following:

In the course of the work, with grinding aid medium 31 grinding chamber 10 is filled into considerable degree.Through abrasive material inlet 11, by means of unshowned pump with flowable abrasive material continuously pumping through grinding chamber 10.In said operation, agitator 6 is driven by drive motors 3 rotations.Abrasive material flows through grinding chamber 10 towards the direction of the abrasive material outlet that is formed by abrasive material outlet 13.Between this flow periods, abrasive material receives the strong shear stress of grinding aid medium 31, thus the abrasive material particle is ground, and makes the abrasive material homogenising in addition.This process is carried out by this way, is promptly forming braided flow as illustrated in fig. 1 and 2 moving 32 between the adjacent agitator disk 14 and between 14 and 17 respectively.They can be explained like this: the tangential momentum that abrasive material and grinding aid medium 31 receive in each

agitator disk

14 or 14 and 17 adjacent to, strong than in two adjacent agitator disks 14, central region between 17.This makes grinding aid medium 31 and the abrasive material of contiguous each

agitator disk

14 or 14 and 17 more doughtily to outflow, and between two adjacent agitator disks 14 or in each central region between 14 and 17, grinding aid medium 31 and abrasive material inwardly reflux towards shaft 5.This grinding and homogenising process be between all agitator disks 14 and all identical between 14 and 17 because these

agitator disks

14,17 identical apart from a with a ', diameter b is identical with b ' and rotating speed is identical.One side closed depressed part 30 is guaranteed described braided flow moving 32 between last agitator disk 17 ' and the adjacent agitator disk 14, and also the braided flow moving 32 with above-mentioned is identical.

Flow through the amount of the abrasive material of grinding chamber 10 corresponding to time per unit, the axial flow that grinding chamber 10 is passed in stack one on braided flow moving 32.At contiguous shaft 5 places, the shunting of abrasive material and grinding aid medium 31 is flowed out from last braided flow between penult agitator disk 14 and the agitator disk 17 moving 32, passes in the separation chamber 21 in the passage 22 entering cages 19 in the agitator disk 17.The summation of these shuntings corresponds essentially to the volume flow of importing and pass through the abrasive material of abrasive material outlet 13 discharges through abrasive material inlet 11.These shuntings are radially also tangentially quickened to extrinsic deflection with respect to axis 16 in the gap 28 that is formed by agitator disk 17 and the midfeather 27 that rotates.Because the rotation of agitator disk 17 and midfeather 27, abrasive material and grinding aid medium 31 are that outwards pointed in gap 28 once more, extra high acceleration, and be wherein especially true with possible still residual thick especially abrasive material particle for grinding aid medium 31.These abrasive material particles and grinding aid medium 31 are outwards centrifugalized through the penetrating part 20 of cage 19.Therefore, grinding aid medium 31 and the rough lapping composition granule that fully do not grind turn back in the braided flow moving 32 again.Do not pass cage 19 that centrifugalize away, through the flow direction deflection vertically and in the periphery 27b of midfeather 27 and the annular gap 27a between the cage 19 of the abrasive material that grinds through screen device 23 discharges.Therefore the separation of grinding aid medium 31 and possible rough lapping composition granule is only carried out in separator 25.

Relation between, agitator disk relevant with the formation of braided flow moving 32 in order to explain 14,17,17 ' diameter b and their axial distance a, a ' should be pointed out that to have defined so-called angle of departure α or β.Angle of departure α or β are formed between two lines 33 and 34.Line 33 extends to the outward flange 36 of adjacent agitator disk 14 from the inner end on shaft 5 35 of agitator disk 14.Another line 34 is 16 the lines of paralleling to the axis.Angle of departure β is last agitator disk 17 or 17 ' and the angle between its nearest agitator disk 14.Moving 32 in order to form described braided flow, the angle of departure should satisfy: 30 °＜α＜60 ° and 30 °＜β＜60 °.In other words, even this means under apart from a and the unequal situation of a ', last agitator disk 17 or 17 ' and the most contiguous agitator disk 14 between angle of departure β make that also can form said braided flow moves 32.

Although agitation grinder all has the axis 16 of level in said each embodiment, the present invention also can be applicable to have the agitation grinder of vertical axis naturally.

At last,

that can be designed to active transportation of the passage 22 in the agitator disk 17,17 ' is as only shown in Fig. 8.The wall portion 37 of passage is not 16 extensions of paralleling to the axis in this case, but---promptly on the direction of midfeather 27---extends on γ ground at angle with the parallel lines of axis 16 against rotation direction 38 and on the flow direction 39.Therefore, abrasive material and grinding aid medium 31 are drawn in the passage 22 especially doughtily and pass this passage and be pushed in the gap 28.Therefore; The in fact approximate total volumetric flow rate that is equivalent to import and pass through the abrasive material volume flow of abrasive material outlet 13 discharges of the total amount of shunting above-mentioned through abrasive material inlet 11; Wherein in this zone; Because exist braided flow to move 32, therefore in abrasive material, there is the grinding aid medium 31 of normal concentration, said grinding aid medium is also carried along passage 22 together.In the above-described embodiments, angle γ satisfies: γ=0 °.Embodiment for the reality of the passage 22 of active transportation satisfies: 0 °＜γ＜45 °.

Claims

1. agitation grinder has:

-grinding container (2),

--said grinding container surrounds a grinding chamber (10),

--abrasive material inlet (11) at one end portion feeds in the said grinding container,

--abrasive material outlet (13) in the other end from said grinding container pass-out, and

--said grinding container receives assistant research fellow's medium (31),

-being arranged in the agitator (6) in the said grinding chamber (10), said agitator (6) has:

--have shaft axis (16), that can be driven in rotation (5),

--diameter is last agitator disk (17,17 ') of b ', and said last agitator disk is installed in said shaft (5) and goes up and be adjacent to said abrasive material outlet (13), and

--diameter is the agitator disk (14) of b, and said agitator disk is installed in said shaft (5) and goes up, is arranged on the axial upstream place of said last agitator disk (17,17 '), separates each other with axial distance a,

--upper reaches agitator disk (14) wherein adjacent one another are is confirmed an angle of departure α, and said last agitator disk (17,17 ') is confirmed an angle of departure β with adjacent agitator disk (14),

--wherein each angle of departure α, β are by an agitator disk (14; 17; 17 ') the line (33) between the outward flange (36) of a radial inner end (35) on the said shaft (5) and an adjacent agitator disk (14) forms with the line (34) that is parallel to said axis (16), and

--wherein satisfy: 30 °＜α＜60 °,

-being arranged in the grinding aid media separating apparatus (25) at said abrasive material outlet (13) upper reaches, said separator has:

--be arranged in the tight upper reaches of said abrasive material outlet (13) screen device (23) and

--on said axis (16) direction, surround the cage (19) of said screen device (23), said cage and said last agitator disk (17,17 ') are fixedly connected and have a penetrating part (20) radially, and

-being adjacent to said shaft to be formed on the passage (22) in said last agitator disk (17,17 ') (5), said passage feeds in the separator (25),

It is characterized in that,

Angle of departure β between said last agitator disk (17,17 ') and the adjacent agitator disk (14) also satisfies: 30 °＜β＜60 °,

In said separator (25); At said last agitator disk (17; 17 ') and between the said screen device (23) be furnished with midfeather (27; 27 '), said midfeather (27,27 ') is not connected with said agitator (6) rotationally with respect to said agitator (6) and extends the diameter d that surpasses said screen device (23) at least.

2. agitation grinder according to claim 1 is characterized in that, the relation for the diameter d of the diameter c of said midfeather (27,27 ') and said screen device (23) satisfies: c >=d.

3. agitation grinder according to claim 2 is characterized in that, said midfeather (27,27 ') extends to closely near said cage (19) always.

4. agitation grinder according to claim 1 is characterized in that, between said midfeather (27 ') and said last agitator disk (17), is provided with distance piece (29).

5. agitation grinder according to claim 1 is characterized in that, said last agitator disk (17,17 ') apart from next-door neighbour's agitator disk (14) apart from a ' equal all upper reaches agitator disk (14) each other apart from a.

6. agitation grinder according to claim 1; It is characterized in that; Said upper reaches agitator disks (14) are provided with opening (15), and said last agitator disk (17 ') is provided with depressed part (30) this last agitator disk on a side of said adjacent agitator disk (14).

7. agitation grinder according to claim 6 is characterized in that, said depressed part (30) has and the identical cross section of said opening (15).

8. agitation grinder according to claim 1 is characterized in that, the diameter b of all agitator disks (14,17), b ' equate.

9. agitation grinder according to claim 1 is characterized in that, said passage (22) is designed to extend towards midfeather (27,27 ') against the rotation direction of said shaft (5) (38).