EP3370877B1 - Broyeur pendulaire perfectionné - Google Patents

Broyeur pendulaire perfectionné Download PDF

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Publication number
EP3370877B1
EP3370877B1 EP16806255.2A EP16806255A EP3370877B1 EP 3370877 B1 EP3370877 B1 EP 3370877B1 EP 16806255 A EP16806255 A EP 16806255A EP 3370877 B1 EP3370877 B1 EP 3370877B1
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EP
European Patent Office
Prior art keywords
shaft
enclosure
central shaft
hand
central
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.)
Active
Application number
EP16806255.2A
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German (de)
English (en)
French (fr)
Other versions
EP3370877A1 (fr
Inventor
Jean-Marc Maréchal
Jean-François MARÉCHAL
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.)
Financiere Industrielle Ste
Original Assignee
Financiere Industrielle Ste
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Publication of EP3370877A1 publication Critical patent/EP3370877A1/fr
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/02—Centrifugal pendulum-type mills

Definitions

  • the present invention relates to a grinder for reducing to a fine powder according to a predefined particle size, various mineral and/or organic materials, such as limestone, sulphates, clinker, clays, coal, petroleum coke, pozzolan , salts, oxides, biomass, etc.
  • various mineral and/or organic materials such as limestone, sulphates, clinker, clays, coal, petroleum coke, pozzolan , salts, oxides, biomass, etc.
  • the crusher of the invention is of the pendular type, that is to say that it operates by compression of the raw mineral materials intended to be crushed, by fracturing the latter in an enclosure, to constitute what is called a "bed of material", the fine powder being evacuated from the top of the enclosure, thanks to a stream of gas.
  • Known pendular mills such as that described in the patent DE102009000442A1 , work as follows.
  • the material is compressed between a grinding ring with a vertical axis and at least two rolling masses on the ring, called rollers.
  • the latter are each mounted in rotation on a vertical rod designated pendulum rod articulated at its free end, on a central structure called "star".
  • the roller and pendulum rod assembly is designated by the term pendulum.
  • the central shaft is rotated by a motor through a reduction gear, both located outside the crusher enclosure under the base (bottom).
  • central shaft is held and guided in rotation by means of a vertical hollow column, fixed to the base (bottom) of the crusher.
  • a pivot connection is provided between the column and the central shaft, inside the crusher enclosure.
  • coulters intended to scrape the material which has deposited on the bottom of the crusher.
  • the coulters are driven in rotation around the shaft by means of a skirt fixed to the latter.
  • the coulters are intended to feed the bed of material.
  • a ventilation system blowing a stream of gas at the base of the grinder.
  • the gases are at room temperature.
  • some materials need to be cooled by the supply of cold gas.
  • the flow of gas at the base of the grinder causes the suspension of the particles of finer material, after grinding by the rollers and the evacuation of these particles from the top of the grinder.
  • the fine particles are then processed downstream by a system called a separator allowing sorting by particle size.
  • the finished product conforming to the particle size is evacuated to the outside, while the particles rejected, as being outside the desired size criteria, fall by gravity to the base of the mill, to feed the bed of material or are extracted from the grinding chamber by means of handling.
  • Means of lubrication, by oil circulation, are provided for each connection of two elements which move relative to each other, and in particular at the level of the pivot connection between the central shaft and the column.
  • the lubrication of the pivot connection between the rollers and their pendulum rod is ensured by a means of bubbling in an oil bath, protected from dust and its abrasive effect, either by a sealed mechanical system, or by a system of injection of air between the pendulums and their roller.
  • the invention therefore aims to solve these difficulties, and proposes a pendulum mill in which the circulation of oil on the one hand and of air on the other hand does not require the production of complicated and therefore expensive parts, which allows balanced air circulation to each pendulum, which is simpler in design, and therefore less expensive and easier to maintain.
  • the means for supporting and holding the central shaft are located outside the internal environment of the enclosure which is dusty and therefore abrasive, and therefore easily accessible for repair or maintenance operations. Air circulation to protect lubrication systems is made simpler, and therefore more efficient.
  • the means for supporting and holding the central shaft include means for driving the central shaft, and more precisely in the form of a rotating hearth associated with a speed reducer assembly, itself associated with the drive means of the central shaft, said sole thus ensuring both the transmission of the rotation of the motor, and the support and guidance of the central shaft.
  • a cylindrical cover through which the central shaft passes, and preferably the cover consists on the one hand of a cylindrical sleeve, and on the other hand of a cover having a central hole at the through which the central shaft passes.
  • the device includes gas ventilation means to create a gas stream at the base inside the enclosure.
  • the gas is heated to between about 150 and 400°C.
  • the device advantageously comprises at least two rollers uniformly distributed angularly around the central shaft.
  • the number of rollers can be equal to three, four, or even exceed four on large crushers and reach five or six. A minimum of two pebbles are required to ensure a balanced assembly.
  • the device comprises scraping coulters, integral with the lower part of the central shaft by arms, and intended to scrape the bottom of the enclosure.
  • a connection system is provided between pendulums on the one hand and the central shaft on the other, in the form of arms arranged in a star.
  • This link system is referred to as a star.
  • the device comprises lubrication means at the connections between the moving parts, and air circulation means are provided for the protection of the latter.
  • a pendular mill comprising a hollow cylindrical enclosure 1, of vertical longitudinal axis XX, comprising a cylindrical wall 2 and a horizontal bottom 3, delimiting a lower base volume 4.
  • the cylindrical wall 2 of the enclosure is provided with a ring-shaped reinforced part 5.
  • the bottom 3 has a central opening 3A.
  • a hollow central column 6, coaxial with the X-X axis, is provided in the enclosure, and whose base 6A is fixed to the bottom 3, in a sealed manner, at the level of the central opening 3A of the bottom.
  • the crusher further comprises a vertical central shaft 7, coaxial with the X-X axis, passing through the column 6, protruding in the upper part of the latter, and protruding downwards from the central opening 3A of the bottom 3.
  • shaft 7 The upper distal end of shaft 7 is connected to two radial arms 12 and 13, perpendicular to shaft 7, by means of a rigid connection 7A which supports and keeps arms 12 and 13 horizontal.
  • each pendulum rod At the free distal end of the arms 12 and 13 are mounted articulated, by a respective pivot link 14 and 15, vertical pendulum rods 16 and 17. At the free distal end of each pendulum rod (opposite to each link pivot) is mounted for rotation a mass or roller 18, 19, of generally cylindrical shape and capable of rotating on itself (arrows "g” and “h"), according to the vertical axis defined by their pendular rod 16, respectively 17.
  • Each roller pair (18, 19)/pendulum rod (16, 17) forms a kind of pendulum.
  • the assembly formed by the central shaft 7, the pendular rods 16 and 17, the radial arms 12 and 13, and the rollers 18, 19, thus form a sort of carousel.
  • the duct 20 makes it possible to convey material or raw materials to treat (arrow "i") in the enclosure.
  • the crusher may comprise more than two pendulums (each pendulum comprises a pendulum rod and associated roller), uniformly distributed angularly around the shaft. Arms radials 12 and 13 (between the shaft 7 and the pendulum rods 16, 17) form a sort of star with as many branches as rollers.
  • a skirt 22 covers the central column 6 and surrounds the latter.
  • the skirt 22 is integral with the shaft 7 at the level of the upper disc 22B, and is driven in rotation by the latter (arrow “j”).
  • ploughshares 23 and 24 are fixed ploughshares 23 and 24, each made for example of a plate of generally square shape, with a concave surface , arranged in an inclined manner.
  • the ploughshares are intended to scrape (by their lower side) the material which has deposited on the bottom 3 of the crusher.
  • Shares 23 and 24 are intended to feed the bed of material on the bottom.
  • a ventilation system blowing a stream of gas at the base of the grinder, via a duct 25 opening into the lower part 4 of the enclosure.
  • the gas stream is heated to a temperature in the range of 150-400°C.
  • the current of gas- causes the suspension of the finer particles of matter, after grinding by the pebbles and the evacuation (arrow “I”) of these particles from the top of the grinder.
  • the fine particles are then processed downstream by a system called a separator allowing sorting by particle size.
  • the separator is of the known type and is not shown for reasons of clarity.
  • the finished product conforming to the particle size is evacuated to the outside, while the particles rejected, as being outside the desired size criteria, fall by gravity to the base of the crusher, to feed the bed of material and be crushed again. or are extracted from the grinding chamber by a handling means.
  • lubricating means are provided at the joints and drives of the moving parts, and this in a known manner.
  • the lubrication systems are protected from the dusty and therefore abrasive environment inside the crusher enclosure, either by a mechanical sealing element, or preferably by an air injection system between the rod pendulum and the corresponding roller, and between the column and the shaft.
  • the invention remedies this by proposing a crusher described below with regard to the figures 2 to 3 .
  • the mill of the invention is shown schematically, like the schematic representation of the figure 1 .
  • elements or components identical or similar to those of the figure 1 bear the same reference numerals.
  • the grinder of the invention according to picture 2 differs in particular from that of the prior art ( figure 1 ), by rotating and maintaining the shaft 7. Other differences will become apparent from the following description.
  • the shaft 7 is, according to the invention, on the one hand kept vertical, and on the other hand driven in rotation on itself (arrow "f"), by specific means comprising a rotating sole 26 outside the enclosure, associated with and arranged in a speed reducer assembly 10A, itself connected to the motor 9.
  • the rotating hearth 26 is rotatably mounted in a fixed pivot 26A, arranged in the reducer 10A, the length of which depends on the size of the grinders.
  • the reducer dimensioned to support the whole in rotation, is itself fixed on a rigid external support, for example embedded in the mass of a solid mass of civil engineering provided for this purpose.
  • the sole 26 thus ensures both the transmission of the rotation of the motor, and the support and guidance of the shaft 7.
  • the shaft is associated with a rigid coupling 27 whose role is to transmit the torque of the motorization by filtering the vibrations.
  • the bottom 3 of the enclosure is open in its central part, over a part of diameter between 50 and 100 cm approximately, which depends on the size of the grinders sufficient to ensure the passage of air at low speed around the shaft 7 (the diameter of the opening is a few centimeters larger than the diameter of the shaft 7).
  • the central opening 29 is associated with a cylindrical cover, through which the shaft 7 passes.
  • the cover consists on the one hand of a fixed cylindrical sleeve 28, and on the other hand of a cover rotating 29 having a central hole through which the shaft 7 passes in a sealed manner. Cover 29 is integral with shaft 7.
  • the scrapers 23 and 24 are rigidly connected to the shaft 7 by radial arms 30 and 31.
  • the means for supporting and holding the shaft are located outside the internal environment of the enclosure which is dusty and therefore abrasive.
  • the reducer 10B comprises on the one hand a vertical pivot 26A in which the rotary sole 26 is rotatably mounted, and on the other hand a rotary drive, for example with a bevel pinion 32 including a pinion 32A, which depends on the reducer used, is connected to the engine not shown and known in itself.
  • the first and second air circuits are respectively connected upstream to a source of clean air, which may be common, not shown and known in itself.
  • the first guide circuit comprises an annular chamber 33, arranged above the rigid coupling system 27, colinearly with the central shaft 7, and located at the base of the latter.
  • Chamber 33 has an inlet or opening 33A, connected to a source of clean air. The air enters the annular chamber 33, symbolized by the arrow "m".
  • the base of the hollow central shaft 7 is provided with one or more openings 34 through which the air from the chamber 33 (arrows “n” and “o”) enters the interior of the central shaft to rise inside it (arrow “p”).
  • the air which thus circulates in this first circuit ensures the protection of the internal lubrication means.
  • the second guide circuit comprises an annular chamber 35, arranged just above the annular chamber 33 of the first protective air circuit, and collinearly with the central shaft 7.
  • the chamber 35 is located at the base of the tree.
  • the chamber 35 has an inlet or opening 35A, connected to a source of clean air.
  • the air is then evacuated (arrows k2, k3, K4 and k5) through the gap between the wall 28 and the cover 29.
  • the second air circuit thus ensures the seal between the cylindrical sleeve 28 and the cover 29, producing an air seal, preventing the particles located in the bottom of the mill from leaving the enclosure of the mill between the fixed annular wall 28 and the rotating cover 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP16806255.2A 2015-11-05 2016-11-07 Broyeur pendulaire perfectionné Active EP3370877B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1560611A FR3043342B1 (fr) 2015-11-05 2015-11-05 Broyeur pendulaire perfectionne
PCT/FR2016/052877 WO2017077258A1 (fr) 2015-11-05 2016-11-07 Broyeur pendulaire perfectionne

Publications (2)

Publication Number Publication Date
EP3370877A1 EP3370877A1 (fr) 2018-09-12
EP3370877B1 true EP3370877B1 (fr) 2022-08-03

Family

ID=55300533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16806255.2A Active EP3370877B1 (fr) 2015-11-05 2016-11-07 Broyeur pendulaire perfectionné

Country Status (4)

Country Link
EP (1) EP3370877B1 (es)
ES (1) ES2929108T3 (es)
FR (1) FR3043342B1 (es)
WO (1) WO2017077258A1 (es)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB187959A (en) * 1921-10-27 1924-01-16 Francois Adrien Pellissier Improvements in or relating to pulverizers
CH558678A (de) * 1973-03-14 1975-02-14 Eirich Gustav Maschinenfabrik Mit ueberkritischer drehzahl arbeitende muehle und verfahren zu ihrem betrieb.
DE102009000442B4 (de) * 2009-01-27 2011-04-07 Neuman & Esser Gmbh Mahl- Und Sichtsysteme Getriebelose Pendelmühle
JP5650085B2 (ja) * 2011-10-03 2015-01-07 田村　允孝 ロールミル

Also Published As

Publication number Publication date
FR3043342B1 (fr) 2021-12-10
WO2017077258A1 (fr) 2017-05-11
ES2929108T3 (es) 2022-11-24
EP3370877A1 (fr) 2018-09-12
FR3043342A1 (fr) 2017-05-12

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