WO1999042217A1 - Wet process grinder equipped with baffle and outlet baffle for said grinder - Google Patents
Wet process grinder equipped with baffle and outlet baffle for said grinder Download PDFInfo
- Publication number
- WO1999042217A1 WO1999042217A1 PCT/BE1999/000024 BE9900024W WO9942217A1 WO 1999042217 A1 WO1999042217 A1 WO 1999042217A1 BE 9900024 W BE9900024 W BE 9900024W WO 9942217 A1 WO9942217 A1 WO 9942217A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- partition
- outlet
- discharge
- towards
- baffle
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
Definitions
- the present invention relates to shredders working in the wet, either of the autogenous type, also called FAG shredders (Full Autogenous Grinding), or of the semi-autogenic type, also called SAG shredders
- the present invention relates more particularly to an outlet partition disposed in such grinders.
- shredders are fitted with an outlet partition which allows the ground material to be discharged to an outlet pin. Possibly, in some cases, the shredders are fitted with partitions 2
- Discharge grinders by grid include a partition usually consisting of a frame, the upstream face of which is covered by grids pierced with a plurality of openings, thus letting through the sufficiently crushed material while retaining the insufficiently crushed material and the bodies. grinding.
- the upstream face is spaced from the downstream face, which is preferably full except for a central discharge opening.
- a small compartment in which the material which passes through the lights penetrates. This material is able to circulate diametrically within the compartment.
- Lifting elements or lifters are provided in this partition in order to lift the material above the axis of the crusher by rotation of the crusher, from where it falls, possibly on a deflector, to move towards the opening discharge center.
- shredders In the case of shredders operating with overflow discharge, the shredders tend to keep the material within the grinding chambers for too long, which produces undesirable superfins, the retention time being too long and the overfilled mill, causing some load slippage and reducing the mill throughput.
- partition frame conventionally has openings (or openings) so as to allow the entry of sufficiently ground material into the partition, while the rear face has no openings except for an annular discharge passage placed at the periphery of the conical element so as to evacuate the crushed materials out of the partition.
- the publication FR-A-2126051 describes a method and a device which make it possible to regulate the quantity of material mixed with the grinding bodies in a grinding compartment of a ball mill tube for example, and in which the grinding can also be carried out both dry and wet.
- a partition intended to separate two successive grinding chambers or to be used as an outlet partition which comprises means for adjusting the level of material within the grinding chamber, consisting of vanes pivoting around of a longitudinal axis so as to be able to adjust the useful volume or comprising a telescopic part making it possible to also adjust this useful volume.
- Document DE-477135 describes a deflector member in the form of a movable cone secured to the crusher, which makes it possible to partially or completely return the material originating from the lifting elements (or lifting elements), in this case blades, towards the compartment upstream of the partition, in order to regrind the insufficiently ground particles which have entered the partition.
- the material again passes through a grid, which in theory could allow a control of the retention time within the mill.
- this cone is an integral part of the mill, an important part of the regulating mechanism operates inside the grinder. This device is actually particularly vulnerable due to wear and seizure by grains and steel waste.
- Document FR-2261812 describes a very simple system for returning insufficiently ground materials (also called “pebbles") associated with already worn grinding bodies to the grinding chamber, which essentially comprises in the central area of the end wall a discharge tube which is associated with a two-way valve, so as to conduct the insufficiently ground materials again towards the grinding chamber while the sufficiently ground material leaves this grinding chamber.
- insufficiently ground materials also called "pebbles”
- Document GB-A-2064364 describes a drum crusher intended for a wet process of the autogenous or semi-autogenous type, and which has a partition adjacent to the outlet partition itself provided with a material discharge pin separated from the outlet partition by a space, said upstream wall comprising on the one hand a first group of relatively small openings through which the finely ground material which leaves the mill can penetrate and go towards the outlet pin and a second group of relatively larger openings through which a material comprising both fine particles and coarse particles can leave the mill.
- This second group of openings communicates with an outlet of the material by deflection means which prevent this mixture from leaving the mill.
- the deflection elements act only 6
- Document O86 / 04526 describes a device for adjusting the retention time of a material in the mill which can be an autogenous, semi-autogenic or ball mill, and which comprises a reservoir chamber upstream of the outlet bottom.
- This mill is characterized by the fact that it comprises a discharge duct more commonly called a "spoon", substantially coaxial with the mill, separated from the latter and movable longitudinally.
- This spoon enters the reservoir chamber through the outlet bottom of the mill and is provided at its upstream end with a first opening made in its upper part. This spoon can advance to near the upstream face of the reservoir chamber. It should be noted that this device called "spoon" is fixed by 7
- Document US-A-2344162 describes a device which makes it possible to divert the ground material towards the outlet pin and to return the crushed material and the spent balls into the grinding chamber while the objective of the system according to the invention is also to deflect the ground material towards the outlet pin but to eliminate these same crushed and worn balls towards the outside of the crusher so that they do not enter the grinding chamber because they reduce the efficiency thereof.
- the intermediate partition described does not have a grid.
- Document DE-A-2848343 describes a device comprising an intermediate partition between two successive grinding chambers. It will be observed that an axis or rod passes through the different grinding chambers. The fact of presenting such an axis will not allow use in large size shredders, since this axis is unable to support the large masses displaced in this case. Finally, we observe that all matter without distinction is likely to pass from one room to another.
- the present invention relates to a mill working in the wet, either of the autogenous type or of the semi-autogenic type, or else operating essentially by grid discharge but which combines both the advantages of a mill discharge by grid and by overflow.
- the present invention aims to propose new means present in the partition which 9
- the present invention aims to propose a solution which is particularly simple from a mechanical point of view, and which should not require the placement of a mobile element, which would be unacceptable for certain applications and in particular for large or very large dimension.
- the present invention aims to propose a solution which also makes it possible to avoid blocking of the discharge chamber by the insufficiently ground material ("pebbles") and by the grinding bodies already worn.
- the present invention relates to a mill working in the wet, autogenous, semi-autogenic or even ball type, operating by grid discharge, comprising an outlet partition between the grinding chamber and the outlet pin.
- Said partition comprises two walls, the volume between the upstream wall and the downstream wall forming a compartment into which the material penetrates. This material can circulate diametrically in said compartment, called "discharge chamber”.
- the upstream wall is a wall essentially covered with perforated grids comprising a plurality of openings which allow the sufficiently crushed material to pass through said compartment inside the partition.
- the downstream wall which is spaced from the upstream wall, is preferably full with the exception of the central part which remains open and which is directed towards the discharge pin.
- said partition comprises means integral with this partition making it possible to ensure (partial) passage of part of the material in the central zone of the compartment provided between the upstream wall and the downstream wall of the partition and therefore towards the grinding chamber upstream of said partition, the rest of the material being discharged towards the outlet pin. This therefore allows mixed operation of the mill by discharge / overflow.
- the fact that the means are integral with the partition means that these will be subjected to the rotation of the mill and can therefore be used even in very large mills.
- the means allowing a partial passage through the central zone of the partition are constituted by deflectors in the form of sheets connecting the upstream wall to the downstream wall in the central compartment area. If all the deflectors are placed, one obtains a cone or a pyramid of discharge and a 100% operation by discharge.
- the means allowing a partial passage through the central zone of the partition are constituted by the placement of a truncated cone in this zone.
- a truncated cone is used which does not cover the entire width of the discharge chamber.
- an annular passage will be provided on the upstream side of the cone, which allows a partial fall of the material in the discharge chamber.
- deflector grids have also been placed in the compartment inside the partition in the most diametrical part of the latter, that is to say towards the periphery. These grids allow the direct evacuation to the outlet pin of the material or of the grinding machines worn or broken without allowing them to be returned to the discharge chamber. 12
- deflecting grids for lights which allow the passage of the finer material with possibly a return to the grinding chamber. It is also provided, to allow the evacuation of the material out of the partition, that the downstream wall has an annular opening arranged around the attachment zone of the deflectors or of the cone.
- FIG. 1 shows a longitudinal sectional view of a ball mill having a single grinding chamber and equipped with an outlet partition usually used.
- FIG. 2 represents a view in longitudinal section shown in FIG. 1, and corresponding to a first embodiment of a partition equipped with means for regulating the level of the material within the grinding chamber.
- Figures 3 show several views in cross section along the axis XX 'of the partition shown in Figure 2 seen from the pin according to various load situations of the crusher.
- Figures 4 show several views in longitudinal section along section AA according to a second embodiment of a partition equipped with means for regulating the level of material within the grinding chamber according to various load conditions of the grinder. 13
- Figure 5 shows a cross-sectional view along the axis XX 'of the partition of figure
- FIG. 6 represents a detailed view of a grid used in a partition as described in FIG. 5.
- Figures 7 show the possibilities of the adjustment means used in the second embodiment.
- the crusher of Figure 1 is a crusher that operates in the wet process and which is formed of a ferrule 1 carried by two conical bottoms 2 and 3.
- the conical outlet bottom 3 is secured to an outlet partition 15 with which outlet pin 4 forms a body.
- a pin 5 is also integral with the bottom 2.
- the pins are carried by bearings (not shown) in Figure 1.
- the crusher is driven by a crown and a pinion (not shown).
- the ferrule 1 and the inlet and outlet bottoms 2 and 3 are fitted with shielding 8 and 9.
- the ferrule 1 is provided with a manhole 7 the cover of which is formed by a shielding element fixed by stirrups 10 and bolts 11.
- the crusher shown in FIG. 1 comprises only one grinding chamber 6, which is partially filled with grinding bodies 17, which are in 14
- partitions are shown in more detail in Figures 2, 3, 4, 5 and 7.
- the partitions consist essentially of a frame, itself comprising a certain number of sectors.
- twelve steel sectors are joined together to create a partition.
- these sectors directly follow the bottom 3 of the mill and are bolted to it by bolts (not shown in the figures).
- the partitions shown in the various embodiments have an upstream face and a downstream face which delimit a volume 12 called the discharge chamber.
- a volume 12 called the discharge chamber.
- the upstream face of the various assembled sectors is covered by grids also made of steel 14 which come to bear on the corresponding sectors.
- the grids 9 can be provided with ribs (not shown in the figures).
- the center of the upstream wall of the partition is in the form of an opening closed by a sheet metal covered with rubber on its two faces and fixed to the frame so as to force the ground material to pass through the grids.
- the downstream wall of the chassis has a central opening according to the embodiment shown in the various figures, which communicates directly with the outlet pin.
- the central part of the partition is equipped with a deflector or discharge cone, the top of which is directed towards the outlet of the mill.
- This discharge cone is generally in the form of a frustoconical central part in order to direct the material present in the compartment of the partition towards the outlet pin.
- the base of this frustoconical part is directed upstream while its top is directed towards the downstream wall in order to slide the material directly towards the outlet pin.
- this partition is equipped with elements called “deflecting grids” 18 which aim to separate coarse or insufficiently ground parts as well as the worn balls from the fine. These deflecting grids 18 also make it possible to directly selectively direct the insufficiently ground materials (pebbles) towards the outlet pin so as to eliminate them.
- the present invention aims to provide means which make it possible to regulate the level of material in the compartment 12 of the partition and consequently in the grinding chamber 6 which communicates with the compartment 12 via the grids 9, thanks to the deflection of a quantity of more or less material towards the outlet pin, while the non-deflected material falls back into the compartment 12.
- deflectors 19 it suffices not to install deflectors 19 on a certain number of sectors of the partition, thus not forcing part of the material contained in this sector to go towards the output pin.
- FIG. 3a This embodiment is shown in detail in Figures 3a, 3b, 3c and 3d.
- Figure 3d shows an arrangement in which none of the deflectors 19 is provided, which allows the crusher to operate at 100% by overflow (100% overflow).
- Figures 3b and 3c represent intermediate situations between the 100% grid (0% overflow) and 100% overflow (100% overflow), namely 50% and 75% overflow.
- the frustoconical part is made using a cone.
- the cone is a truncated cone at the base, that is to say that it makes it possible to open a passage at the base of the cone on the upstream side of the partition. This allows a partial passage of part of the material 17
- FIG. 4a represents a cone which does not allow operation by overflow (0% overflow) and occupies the entire central zone of compartment 12.
- FIG. 4d represents the conditions under which no cone is arranged, allowing overflow operation (100% overflow).
- Figures 4b and 4c show intermediate situations.
- FIG. 7 represents a partition in which the second embodiment was used.
- the upstream face is covered at the periphery with grids having openings, while the central part is covered by a disk 16 made of sheet metal.
- the downstream face is formed at the periphery by the shielding or by a solid wall in the case of an intermediate chamber, while the central part is free.
- the two walls define a compartment, the central part of which is provided with radial elements which are arranged so as to hold in place either the cones or the deflectors.
- FIGS 7b and 7c there is shown an exploded view of the various elements constituting the central area of the wall, in which different heights of cones have been proposed.
- the partial fixing of the cones is provided by means known per se, of the bolt, nut, etc. type.
- the choice of a type of cone is governed by the type of material to be ground and the fineness of the material desired 18
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU25049/99A AU2504999A (en) | 1998-02-20 | 1999-02-18 | Wet process grinder equipped with baffle and outlet baffle for said grinder |
CA002320796A CA2320796A1 (en) | 1998-02-20 | 1999-02-18 | Wet process grinder equipped with baffle and outlet baffle for said grinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98870034.0 | 1998-02-20 | ||
EP98870034A EP0937503A1 (en) | 1998-02-20 | 1998-02-20 | Discharging device for a wet grinding mill |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999042217A1 true WO1999042217A1 (en) | 1999-08-26 |
Family
ID=8236998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BE1999/000024 WO1999042217A1 (en) | 1998-02-20 | 1999-02-18 | Wet process grinder equipped with baffle and outlet baffle for said grinder |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0937503A1 (en) |
AU (1) | AU2504999A (en) |
CA (1) | CA2320796A1 (en) |
WO (1) | WO1999042217A1 (en) |
ZA (1) | ZA991316B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110293479A (en) * | 2018-03-22 | 2019-10-01 | 塞泰克单一股东股份公司 | A kind of grinding machine for grinding-material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101690905B (en) * | 2009-09-27 | 2011-08-03 | 东南大学 | Conical surface sieve flash device |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE477135C (en) | 1927-06-28 | 1929-06-01 | Fried Krupp Grusonwerk Akt Ges | Drum mill for wet grinding |
US1787897A (en) | 1929-08-13 | 1931-01-06 | Joseph V Durnin | Compartment tube grinding mill |
DE549694C (en) | 1932-05-03 | Miag Muehlenbau Und Ind Akt Ge | A viewing chamber for pipe, ball, compound mills or the like, traversed by a suction air stream. | |
US2344162A (en) | 1940-11-26 | 1944-03-14 | Richard W Marland | Grinding mill discharge |
US2815176A (en) | 1955-04-06 | 1957-12-03 | Kennedy Van Saun Mfg & Eng | Apparatus for producing carbonaceous materials for electrodes |
US3078050A (en) | 1960-01-08 | 1963-02-19 | Hardinge Harlowe | Autogenous grinding process and mill systems to perform the same |
FR2126051A5 (en) | 1971-02-18 | 1972-09-29 | Slegten Pierre | |
FR2261812A1 (en) | 1974-02-27 | 1975-09-19 | Boliden Ab | |
FR2345213A1 (en) * | 1976-03-26 | 1977-10-21 | Polysius Ag | ELEVATOR PARTITION FOR TUBULAR CRUSHER |
DE2848343A1 (en) | 1978-11-08 | 1980-05-22 | Bergheimer Emaillierwerk Herke | Transfer pattern application machine - has guide delivering adhesive sheet leading edge onto moving item |
DE2848438A1 (en) * | 1978-11-08 | 1980-05-22 | Kloeckner Humboldt Deutz Ag | Tube mill for grinding material - has double plate material transfer with transfer orifice in baffle plate adjustable during operation |
GB2064364A (en) | 1979-11-30 | 1981-06-17 | Boliden Ab | Arrangement in drum mills |
WO1986004526A1 (en) | 1985-02-08 | 1986-08-14 | Slegten, Societe Anonyme | Device for regulating the retention time of the material in a grinding mill |
-
1998
- 1998-02-20 EP EP98870034A patent/EP0937503A1/en not_active Withdrawn
-
1999
- 1999-02-18 WO PCT/BE1999/000024 patent/WO1999042217A1/en active Application Filing
- 1999-02-18 AU AU25049/99A patent/AU2504999A/en not_active Abandoned
- 1999-02-18 ZA ZA9901316A patent/ZA991316B/en unknown
- 1999-02-18 CA CA002320796A patent/CA2320796A1/en not_active Abandoned
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE549694C (en) | 1932-05-03 | Miag Muehlenbau Und Ind Akt Ge | A viewing chamber for pipe, ball, compound mills or the like, traversed by a suction air stream. | |
DE477135C (en) | 1927-06-28 | 1929-06-01 | Fried Krupp Grusonwerk Akt Ges | Drum mill for wet grinding |
US1787897A (en) | 1929-08-13 | 1931-01-06 | Joseph V Durnin | Compartment tube grinding mill |
US2344162A (en) | 1940-11-26 | 1944-03-14 | Richard W Marland | Grinding mill discharge |
US2815176A (en) | 1955-04-06 | 1957-12-03 | Kennedy Van Saun Mfg & Eng | Apparatus for producing carbonaceous materials for electrodes |
US3078050A (en) | 1960-01-08 | 1963-02-19 | Hardinge Harlowe | Autogenous grinding process and mill systems to perform the same |
FR2126051A5 (en) | 1971-02-18 | 1972-09-29 | Slegten Pierre | |
FR2261812A1 (en) | 1974-02-27 | 1975-09-19 | Boliden Ab | |
FR2345213A1 (en) * | 1976-03-26 | 1977-10-21 | Polysius Ag | ELEVATOR PARTITION FOR TUBULAR CRUSHER |
DE2848343A1 (en) | 1978-11-08 | 1980-05-22 | Bergheimer Emaillierwerk Herke | Transfer pattern application machine - has guide delivering adhesive sheet leading edge onto moving item |
DE2848438A1 (en) * | 1978-11-08 | 1980-05-22 | Kloeckner Humboldt Deutz Ag | Tube mill for grinding material - has double plate material transfer with transfer orifice in baffle plate adjustable during operation |
GB2064364A (en) | 1979-11-30 | 1981-06-17 | Boliden Ab | Arrangement in drum mills |
US4441659A (en) * | 1979-11-30 | 1984-04-10 | Marklund Olle E | Arrangement in drum mills |
WO1986004526A1 (en) | 1985-02-08 | 1986-08-14 | Slegten, Societe Anonyme | Device for regulating the retention time of the material in a grinding mill |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110293479A (en) * | 2018-03-22 | 2019-10-01 | 塞泰克单一股东股份公司 | A kind of grinding machine for grinding-material |
Also Published As
Publication number | Publication date |
---|---|
ZA991316B (en) | 1999-12-29 |
EP0937503A1 (en) | 1999-08-25 |
CA2320796A1 (en) | 1999-08-26 |
AU2504999A (en) | 1999-09-06 |
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