EP0693966B1 - Dispositif et procede pour fixer une cloison de broyeur tubulaire - Google Patents

Dispositif et procede pour fixer une cloison de broyeur tubulaire Download PDF

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Publication number
EP0693966B1
EP0693966B1 EP94914361A EP94914361A EP0693966B1 EP 0693966 B1 EP0693966 B1 EP 0693966B1 EP 94914361 A EP94914361 A EP 94914361A EP 94914361 A EP94914361 A EP 94914361A EP 0693966 B1 EP0693966 B1 EP 0693966B1
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EP
European Patent Office
Prior art keywords
shell
sectors
holes
baseplate
intermediate baseplate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94914361A
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German (de)
English (en)
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EP0693966A1 (fr
Inventor
Albert Schenk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Slegten SA
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Slegten SA
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Publication date
Application filed by Slegten SA filed Critical Slegten SA
Priority to EP94914361A priority Critical patent/EP0693966B1/fr
Publication of EP0693966A1 publication Critical patent/EP0693966A1/fr
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Publication of EP0693966B1 publication Critical patent/EP0693966B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • B02C17/04—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 with unperforated container
    • B02C17/06—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 with unperforated container with several compartments

Definitions

  • the present invention relates to tube mills with grinding balls or similar grinding members, comprising at least two grinding compartments separated by a partition. These tube mills work by dry or wet processing and are intended, by way of example, for the grinding of cement.
  • the subject of the present invention relates more particularly to a device for fixing a partition to the shell of a tube mill and to a method for the implementation of the device.
  • the main role of the partitions which separate two successive compartments of a tube mill is to keep the grinding bodies in the ad hoc grinding compartments - taking into account their dimensions - preventing them from passing from one compartment to the other.
  • partitions are furthermore intended to screen the ground matter, allowing only the sufficiently fine particles to pass towards the downstream compartment.
  • partitions of this type include a frame consisting of several sectors to which grilles are fixed upstream, these grilles enabling the sufficiently ground material to pass downstream and downstream of the lining plates which provide a central discharge opening for the material to pass to the downstream compartment.
  • the grilles and the lining plates which are called wear pieces are fixed by bolting to the frame.
  • the wear pieces From steel having a very high hardness so that they can withstand the impacts of the grinding bodies and the wear caused by the ground material (abrasion) for a sufficiently long time.
  • the frame supporting the wear pieces must have good properties in terms of abrasion, corrosion and temperature.
  • the reason for this is that the matter to be ground may be of various shapes and, in particular, in the case of a wet process, in the form of a paste which is abrasive, corrosive and having a density greater than 1.
  • the working conditions of the frame are then particularly harsh.
  • the frame must be able to be inserted into the tube mill, and, consequently, it must consist of several sectors having sufficiently small dimensions so as to be able to pass through the inspection doors or through the inlet throat.
  • the grilles are pierced by openings or slots so as to allow the ground matter to penetrate into the torus and it is subsequently extracted through a central opening of the downstream face of the partition.
  • the torus of the framework is divided radially into sectors, the dimensions of which are defined so as to enable them to be inserted into the mill through the doors or the inlet throat.
  • each sector of the framework must be an integral divisor of the number of drill-holes which the tube mill possesses on its circumference. This enables each sector to be fixed to the inner face of the shell of the tube mill by simply bolting each sector to the shell.
  • the European patent EP-A-0 504 041 offers the same series of inconveniences. It presents a system that enables to use identical modules for different diameters of mill shells. The system does not meet the difficulty of different drill-holes locations for the same diameter.
  • the exterior module is in direct contact with the mill shell.
  • the wedges must be adapted to the size of the module. They are there to protect the mill shell from the pressure of the annular piece. They do not constitute a baseplate serving as an interface to link two different structures.
  • the module in contact with the mill shell is elaborated. Adapting the construction of the said module to the location of the drill holes of each mill shell is therefore complicated and expensive.
  • the same system aims at protecting the mill shell from the deformation of the diaphragm.
  • the problem is exactly the opposite : the deformations in the diaphragm find their origin in the deformations of the shell.
  • the said diaphragm should tend to leave the movements of the mill shell completely free. If the structure of the diaphragm tends to rigidify the diaphragm, either the structure of the said diaphragm breaks or the bolts linking the said structure to the shell break or the shell itself tears.
  • Document DE-A-2,133,431 describes mechanically joined and/or welded frameworks which have a structural design similar to the cast frameworks.
  • the various sectors constituting the frame are bolted by their peripheral baseplates directly to the shell of the tube mill.
  • the elements of the disc are fixed to the segments of the ring either by welding or by bolting.
  • radial blades having a T-shaped cross-section are welded on site to the peripheral ring and to the downstream disc, the web of the T being placed perpendicular to the disc.
  • the assembly of the various pieces constituting the partition must be so accurate that no opening greater than the maximum dimension of the slots existing in the grilles can appear (in general, these slots are less than 6 mm).
  • the minimum assembly gaps, added to the manufacturing tolerances, cannot exceed the maximum dimensions of the slots existing in the grille.
  • a recent approach consists in producing cast frameworks, as was the case for partitions intended for small-diameter tube mills, but with steels having high hardness (HRC greater than 35) and, preferably, stainless steels.
  • foundry techniques make it possible to choose alloys suitable for resisting corrosion and to heat-treat them so as to obtain mechanical characteristics suitable for resisting abrasion. Furthermore, foundry techniques currently make it possible to design very diverse shapes easily and, in particular, shapes which are suitable for resisting the mechanical stresses.
  • the present invention aims to provide a partition-fixing device for a tube mill; the partition including a framework produced from a cast material, which is in the form of a juxtaposition of several sectors, in such a way that, for each diameter of a tube mill, a limited number of foundry patterns, or indeed just a single one, is constructed, and this being so independently of the standards relating to the drill-holes and the dimensions of the inspection doors of the mill.
  • the present invention consequently aims to provide a solution when the fixing means existing at the periphery of the sectors cannot be matched to the drill-holes of the shell of the tube mill.
  • the present invention aims for the various sectors constituting the framework of a partition to be assembled with accurate setting and adjustment, which prevents the appearance of openings of a dimension greater than the maximum dimension of the existing slots.
  • the present invention relates to a device for fixing a partition to a shell of a tube mill, in which the partition comprises a cast framework, in steel or in cast iron, consisting of several sectors provided with a set of fixing holes in their peripheral face, each sector being independent of the other sectors the space between said device and the shell being filled up with adjustment elements and with cast metal melting at low temperature characterized in that it possesses an annular intermediate baseplate composed of several segments joined together so as to constitute a monobloc baseplate and which is arranged facing the said shell, providing a space between the shell and the intermediate baseplate, this space being chosen so that the inner face of the intermediate baseplate forms a reference surface at the nominal diameter of the periphery of the said cast sectors, the intermediate baseplate being provided with holes which can be matched to the said set of fixing holes of the peripheral face of the sectors in order to enable the latter to be fixed by bolts in the holes of the intermediate baseplate, means being provided for rigidly fastening the intermediate baseplate to the shell.
  • the partition comprises a cast framework, in steel
  • the external diameter of the intermediate baseplate is chosen to be able to be fitted easily into a tube mill of a given diameter which differs from the nominal diameter by the value of the manufacturing tolerances.
  • the intermediate baseplate which has a relatively small cross-section, is cut up into three or four segments in order to be able to be inserted into the shell through the access point of the tube mill. These segments are subsequently welded, when fitting, so as to form a monobloc intermediate baseplate.
  • the adjustment elements which fill the space between the intermediate baseplate and the shell may be made up of a cast metal melting at low temperature, such as zinc.
  • the metal melting at low temperature may constitute the means for rigidly fastening the intermediate baseplate to the shell.
  • the intermediate baseplate being fitted to a precise internal diameter, may serve as a reference surface.
  • the sectors of the framework are subsequently fixed to the intermediate baseplate; their installation no longer requires particular positioning precaution because of the very presence of the intermediate baseplate as a reference surface.
  • the intermediate baseplate is fixed by bolting, on the one hand, to the shell of the tube mill and, on the other hand, to the various sectors.
  • the intermediate baseplate possesses, on its outer face, a series of holes intended for fixing it to the shell of the tube mill, these holes being able to be matched to the drill-holes in the shell of the tube mill which are determined by the constructor of the said tube, and another series of holes, which are tapped and which can be matched to the precise arrangement of the holes for fixing the sectors.
  • the intermediate baseplate consists of a rolled steel sheet, the composition of which may be chosen so as to resist corrosion and abrasion.
  • This sheet has the advantage of being able to be easily worked, in particular bent and drilled.
  • the protection of the intermediate baseplate from abrasion may be achieved by creating sectors the base of which covers the intermediate baseplate entirely. Parts projecting from the wear pieces may be provided so as to protect the intermediate baseplate laterally.
  • Figure 1 represents a partial section of the mill perpendicular to its axis, the grinding balls and the shell linings having been removed; the section shows a partition provided with the fixing device according to the invention, seen from the inlet of the mill, part of the grilles having been removed in order to show two sectors constituting the framework of the partition, and the front face of one of the two sectors having been cut away in order to show part of the lifting device and the peripheral face of the sector.
  • Figure 2 represents a sectional view of the partition in a plane passing through the axis of the mill along the line II-II of Figure 1.
  • Figure 3 represents a sectional view of the partition in a plane passing through the axis of the mill along the line III-III of Fig. 1.
  • Figure 4 represents the feet of two contiguous sectors, the upstream face of which has been cut away and the external cylindrical surface of which covers the intermediate baseplate entirely.
  • Figure 5 represents a tapped added piece fixed into the intermediate baseplate.
  • the fixing device described relates to a partition fitted between two grinding compartments of a rotary ball mill.
  • the partition comprises a framework which is in the form of a torus (1), the axis (2) of which corresponds to the axis of the tube mill and the external cylindrical surface (3) of which faces the internal cylindrical surface of the shell (4) of the tube mill.
  • the two annular faces (5) and (6), upstream and downstream with respect to the forward movement of the matter, are perpendicular to the axis (2) of the mill and respectively support the grilles (7) and the lining plates (8).
  • the grilles (7) are pierced by openings (9) called slots which enable the ground matter to penetrate into the torus (1). This matter is subsequently extracted through a central opening (10) existing on the downstream face of the partition.
  • the central opening (10) appearing on the side of the downstream face (6) of the framework comprises a truncated cone (11) coaxial with the said torus (1) and the top of which is directed towards the downstream compartment.
  • the torus (1) of the framework is divided regularly into a certain number of sectors (15), the dimensions of which are defined so as to enable them to be inserted into the mill through the inspection doors or through one of the throats.
  • the sectors (15) of the framework are produced in cast steel or in cast iron.
  • the shell deforms and its various sections become oval due to the effect of the movements of the grinding charges and the same applies to the cross-section of the shell where the partition is located. It is necessary for the partition to be produced so as to withstand these deformations: this is the reason why the various sectors constituting the framework are independent; this enables them to move further apart or closer together without the ovalization of the shell creating stresses in the framework.
  • truncated cone (11) is not fixed to the sectors but by means of its flange (12) to an annular flange (13) housed freely in an annular groove (50) in the grilles (7).
  • a screen (14) intended for preventing the grinding bodies or the insufficiently ground particles from passing, closes the opening of the truncated cone and is held fast between the flange (13) and the flange (12) of the truncated cone.
  • These sectors are provided with holes intended to receive the bolts which fix, on the one hand, the grilles (7) to the upstream face and, on the other hand, the lining plates (8) to the downstream face.
  • the upstream and downstream faces of the sectors are widened right opposite the bolts so as to ensure that the grilles are seated correctly.
  • They also comprise radial blades (16) which form the web of the sectors and which extend from the periphery of the partition constituted by the external cylindrical surface (3)produced as far as the central part of the sectors.
  • These blades are intended, by virtue of the rotation of the mill, to transport the ground matter which penetrates into the torus (1) of the partition from the said periphery of this partition towards the central cone where this ground matter flows out into the downstream compartment of the mill.
  • These blades furthermore ensure the rigidity of the sectors (15) against the axial thrusts exerted by the grinding balls which partially fill the upstream and downstream grinding compartments contiguous with the partition.
  • the blades In order to prevent the upstream and downstream faces of the sectors from masking the slots of the grilles and from thus reducing the flow of matter or the passage of ventilation air, the blades have a smaller width outside the zones for seating the grilles and the upstream and downstream faces of the sectors are not planar but follow the contour of the lifting devices.
  • a monobloc annular intermediate baseplate (100) is arranged facing the shell (4), allowing a gap (105) to remain between the said baseplate and the shell and setting this gap by means of adjustment elements (110) so that the internal surface (111) of the baseplate constitutes a reference surface exactly at the nominal diameter of the periphery of the sectors.
  • the space (112), which remains between the shell, the baseplate and the adjustment elements, may subsequently be filled up by means of a cast metal melting at low temperature.
  • the said intermediate baseplate (100) consists of several segments, generally three or four, which enables them to be easily inserted through the accesses into the tube mill.
  • the intermediate baseplate (100) consists of a rolled steel sheet, the composition of which may be chosen so as to resist corrosion.
  • This implementation has the advantage of enabling the said sheet to be drilled and shaped easily using sheet-metal-working techniques, and this may be done depending on the individual requirements of each tube mill, for example depending on the drill-holes existing in the shell and the drill-holes existing at the periphery of the cast sectors.
  • the sectors possess a U-shaped foot (17), the external cylindrical surface (3) of which faces the internal cylindrical surface of the baseplate.
  • the intermediate baseplate will be completely protected by the juxtaposition of the sectors.
  • This intermediate baseplate has, on the one hand, a series of holes (101) intended to match the drill-holes (41) existing in the shell of the tube mill and bolting fixes the baseplate to the shell.
  • the peripheral face of the No. X sectors is provided with X holes intended to match the X threaded holes of the intermediate baseplate, bolts 32 fixing the sectors to the baseplate.
  • the holes (101) existing in the intermediate baseplate in order to fix it to the shell are tapped so as to enable bolts to be screwed into them, the heads of the bolts lying outside the shell (4).
  • the tapped holes (102) existing in the baseplate are formed by added pieces.
  • the fourth bolt (32) has been withdrawn
  • the metal melting at low temperature inserted into the space (112) existing between the baseplate and the shell, rigidly fastens the baseplate to the shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Connection Of Plates (AREA)
  • Processing Of Terminals (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Discharge Heating (AREA)
  • Control Of Metal Rolling (AREA)
  • Supports For Pipes And Cables (AREA)
  • Making Paper Articles (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Earth Drilling (AREA)

Claims (7)

  1. Dispositif de fixation d'une cloison à une virole (4) d'un tube broyeur, où la cloison comprend une ossature coulée (1), en acier ou en fonte, constituée de plusieurs secteurs (15), les secteurs (15) étant pourvus d'un ensemble de trous de fixation dans leur face périphérique (3), chaque secteur (15) étant indépendant des autres secteurs, l'espace (112) entre ledit dispositif de fixation et la virole (4) étant comblé à l'aide d'éléments de réglage (110) et de métal coulé fusant à basse température, caractérisé en ce qu'il possède une semelle annulaire intermédiaire (100) composée de différents segments solidaires entre eux pour former une semelle intermédiaire monobloc qui est disposée en regard de ladite virole (4) en prévoyant un espace entre la virole (4) et la semelle intermédiaire (100), cet espace étant choisi de façon à ce que la face interne de la semelle intermédiaire (100) forme une surface de référence au diamètre nominal de la périphérie desdits secteurs coulés (15), la semelle intermédiaire étant pourvue de trous (102) pouvant être appariés audit ensemble de trous de fixation de la face périphérique (3) des secteurs (15) pour permettre de fixer ces derniers par des boulons dans les trous de la semelle intermédiaire (100), des moyens (101, 41) étant prévus pour fixer rigidement la semelle intermédiaire (100) à la virole (4).
  2. Dispositif selon la revendication 1 caractérisé en ce que les moyens pour fixer rigidement la semelle intermédiaire (100) à la virole (4) sont constitués de trous (101) présents sur la semelle intermédiaire (100) qui s'apparient à des perçages (41) de la virole, la semelle étant fixée rigidement à la virole par boulonnage.
  3. Dispositif selon la revendication 2, caractérisé en ce que les trous (41) dans la semelle intermédiaire (100) sont des trous taraudés dans lesquels viennent se fixer des boulons (101) dont les têtes se situent à l'extérieur de la virole (4).
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les trous taraudés (102) dans la semelle intermédiaire (100) sont formés par des pièces rapportées.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la semelle intermédiaire (100) est constituée d'une tôle d'acier laminé dont la composition est choisie de manière à résister à la corrosion.
  6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la semelle intermédiaire (100) est protégée totalement par la base (3) des secteurs (15) constituant l'ossature et par les pièces d' usure (7, 8).
  7. Procédé de fixation d'une cloison à une virole (4) d'un tube broyeur dans lequel la cloison comprend une ossature coulée (1), en acier ou en fonte, constituée de plusieurs secteurs (15) pourvus d'une série de trous de fixation dans leur face périphérique (3), chaque secteur étant indépendant des autres secteurs, l'espace (112) entre le dispositif de fixation et la virole (4) étant comblé à l'aide d'éléments de réglage (110) et un métal coulé fusant à basse température étant prévu, ledit procédé étant caractérisé en ce qu'une semelle annulaire intermédiaire monobloc (100) pourvue de trous (102) pouvant être appariés à l'ensemble de trous de fixation dans la face périphérique (3) des secteurs (15) de manière à permettre de fixer ces derniers par des boulons dans les trous de la semelle intermédiaire (100), est disposée en regard de ladite virole (4) en prévoyant un espace entre la virole (4) et la semelle intermédiaire (100) de manière à ce que la face interne de la semelle intermédiaire (100) forme une surface de référence au diamètre nominal de la périphérie desdits secteurs coulés (15), la fixation de la semelle intermédiaire (100) à la virole (4) étant prévue par des moyens adéquats (101, 41).
EP94914361A 1993-04-23 1994-04-08 Dispositif et procede pour fixer une cloison de broyeur tubulaire Expired - Lifetime EP0693966B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94914361A EP0693966B1 (fr) 1993-04-23 1994-04-08 Dispositif et procede pour fixer une cloison de broyeur tubulaire

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP93870069 1993-04-23
EP93870069 1993-04-23
PCT/EP1994/001119 WO1994025164A1 (fr) 1993-04-23 1994-04-08 Dispositif et procede pour fixer une cloison de broyeur tubulaire
EP94914361A EP0693966B1 (fr) 1993-04-23 1994-04-08 Dispositif et procede pour fixer une cloison de broyeur tubulaire

Publications (2)

Publication Number Publication Date
EP0693966A1 EP0693966A1 (fr) 1996-01-31
EP0693966B1 true EP0693966B1 (fr) 1997-05-28

Family

ID=8215337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94914361A Expired - Lifetime EP0693966B1 (fr) 1993-04-23 1994-04-08 Dispositif et procede pour fixer une cloison de broyeur tubulaire

Country Status (14)

Country Link
EP (1) EP0693966B1 (fr)
JP (1) JPH08509164A (fr)
KR (1) KR960700817A (fr)
AT (1) ATE153566T1 (fr)
AU (1) AU6677694A (fr)
BR (1) BR9406458A (fr)
CA (1) CA2155780A1 (fr)
CZ (1) CZ272395A3 (fr)
DE (1) DE69403470T2 (fr)
DK (1) DK0693966T3 (fr)
ES (1) ES2103585T3 (fr)
GR (1) GR3024514T3 (fr)
TR (1) TR27806A (fr)
WO (1) WO1994025164A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013108809A1 (de) * 2013-08-14 2015-02-19 Netzsch-Feinmahltechnik Gmbh Trennvorrichtung für eine kugelmühle oder rührwerkskugelmühle sowie kugelmühle oder rührwerkskugelmühle mit trennvorrichtung
CN114247526A (zh) * 2021-12-27 2022-03-29 北方重工富勒（沈阳）矿业有限公司 筒体结构和塔磨机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298619A (en) * 1965-03-08 1967-01-17 Allis Chalmers Mfg Co Multiple compartment grinding mills
US4498634A (en) * 1983-09-01 1985-02-12 Fuller Company Division head for grinding mill
FR2673854B1 (fr) * 1991-03-12 1993-07-16 Cambier Benjamin Cloison pour broyeur cylindrique a boulets a plusieurs niveaux de relevage de matieres.

Also Published As

Publication number Publication date
GR3024514T3 (en) 1997-11-28
ES2103585T3 (es) 1997-09-16
CZ272395A3 (en) 1996-05-15
KR960700817A (ko) 1996-02-24
CA2155780A1 (fr) 1994-11-10
WO1994025164A1 (fr) 1994-11-10
TR27806A (tr) 1995-08-29
DE69403470T2 (de) 1997-11-20
AU6677694A (en) 1994-11-21
BR9406458A (pt) 1996-01-30
DK0693966T3 (da) 1997-12-22
ATE153566T1 (de) 1997-06-15
EP0693966A1 (fr) 1996-01-31
DE69403470D1 (de) 1997-07-03
JPH08509164A (ja) 1996-10-01

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