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EP3228387B1 - Installation de fraisage pour le sable ou le gravier - Google Patents

Installation de fraisage pour le sable ou le gravier Download PDF

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Publication number
EP3228387B1
EP3228387B1 EP17165714.1A EP17165714A EP3228387B1 EP 3228387 B1 EP3228387 B1 EP 3228387B1 EP 17165714 A EP17165714 A EP 17165714A EP 3228387 B1 EP3228387 B1 EP 3228387B1
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EP
European Patent Office
Prior art keywords
chamber
milling
fine particles
mill
milling chamber
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
EP17165714.1A
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German (de)
English (en)
Other versions
EP3228387A1 (fr
Inventor
Jose Antonio CHAURE LARRAZ
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.)
Talleres Alquezar SA
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Talleres Alquezar SA
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Publication date
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Publication of EP3228387A1 publication Critical patent/EP3228387A1/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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/26—Passing gas through crushing or disintegrating zone characterised by point of gas entry or exit or by gas flow path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation

Definitions

  • the present invention relates to a milling installation for arid, especially arid originating from gravel pits and quarries, which includes a mill that has a milling chamber with a rotor with a vertical axis and a rigid wall coaxially surrounding said rotor.
  • Milling installations which include mills of the type indicated, intended to triturate arid originating from quarries and gravel pits, in whose mills the material is supplied in a vertical manner in the center of the rotor which rotates at high speed, such that the supply material that enters into the same is accelerated radially and is projected towards the outside through the channels of the rotor. Said material impacts at a high speed the rigid wall that is coaxial to the rotor, which can have different configurations and be formed by a crown of impact plates or a wall formed by the material itself.
  • the performance of the milling installation described depends on various factors, such as the speed of the rotor, the type of rotor (open or closed) and the presence/absence of the arrangement of the crown of impact plates.
  • the (sand) material obtained after classification must be suitable to be used in the manufacture of concrete, asphalt, mortars and for other uses.
  • the excess of fine particles, material up to 63 microns, may cause this sand to be unsuitable for use and it may be necessary to carry out a subsequent process to eliminate these fine particles by means of washing in a wet process or pneumatic separation.
  • the moisture of the product makes the triturating process and subsequent classification difficult.
  • Document US20130048767 relates to a method for comminution of mill feed, in particular for the cement industry, wherein the grinding material is subjected in a mill, in particular an air swept roller mill, to a grinding-drying with supply of a hot gas, is classified and fed as a dust-gas mixture to a filter for dust separation.
  • a hot gas generator it is provided that fresh gas or fresh air, which is admixed for removal of the moisture of the grinding material in a predefinable portion to the recirculated hot gas or process gas, is preheated before admixing.
  • the preheating of the fresh gas takes place in a heat exchanger through transfer of the heat energy of the process gas to be removed which is then discharged at a lower temperature to the environment.;
  • the preheated fresh gas is fed to the grinding circuit and admixed to the recirculation gas at the required points, for example as combustion air or via fresh air dampers, before or in the mill.
  • Document US3155326 discloses a device for pulverizing rock and ores and reducing them to finely divided particles.
  • the device comprises an air circulating system for precisely selectively sizing and accurately controlling the grit size of the finished treated ore.
  • the device also comprises a horizontally rotating activating member which both breaks up the ore and provides the air circulation which accurately separates the coarse material from the desired sized material and recirculates the coarse material over the activating member for further reducing the coarse material to final desired size, so that a finished product of extremely grit size and texture ores is provided.
  • the object of the present invention is to eliminate the stated problems by means of a separator mill that includes a mill of the type indicated to which the required elements are added in order to carry out the separation of fine particles in said mill, such that they do not accompany the extracted arid through the lower part of the milling chamber.
  • the fine particles not to pass with the rest of the arid into the selection installation but rather to be removed directly from the mill which will mean that subsequent sieving of the arid will be more effective given that the smaller particles forming the fine particles are the most difficult to sieve, especially in the presence of moisture;
  • the eliminated fine particles can be used in different fields of industry, supply, etc. in accordance with their chemical characteristics.
  • a separator mill is designed such that the conventional mill is modified, installing on the same a static or dynamic separator adapted to the configuration and geometry of the conventional mill, such that it allows the passage of an air current ascending through the milling chamber which drags the fine particles from the said chamber through the separator where the classification is carried out.
  • the fine particles are subsequently gathered into two different sizes in a cyclone and in a sleeve filter.
  • the air current can be at room temperature during the times at which drying is not required or can be formed by the hot gases produced by a gas generator which can be included in these types of installations during the times at which it is necessary to dry the fine particles and the rest of the material.
  • the separator mill has an air inlet located on the lower part of the milling chamber of said separator mill, below the rotor and below the transmission belt housing thereof.
  • the installation will include means for making an air current circulate in an ascending direction through the milling chamber of the separator mill from said air inlet, the current of which will be capable of dragging the fine particles produced into said milling chamber.
  • the installation will be supplemented with means for recovering fine particles, through which the air current will be made to pass and which will drag the fine particles.
  • the element that makes the air current circulate through the milling chamber of the mill and the means for separating fine particles will be formed by a suction fan arranged at the end of the installation and after the means for recovering fine particles.
  • These elements for separating fine particles comprise a static or dynamic separator which is arranged on top of the milling chamber of the mill.
  • a cyclone and a final sleeve filter are arranged after the separator.
  • variable air current circulating in an ascending direction through the milling chamber of the mill and the fine particles dragged by said current are made to pass consecutively through the static or dynamic separator, cyclone and sleeve filter, said fine particles being decanted or separated successively according to size.
  • the static separator is formed by two coaxial walls, an internal wall and another external wall, with a cylindrical part and a conical part. Two chambers, a central chamber and an annular chamber are delimited between the two walls.
  • the central chamber is subdivided into two areas, an upper and a lower one.
  • the lower area leads, at the bottom, into the milling chamber and the material to be milled is supplied through said chamber.
  • the annular chamber leads, at the bottom, into the milling chamber and, at the top, it is connected to the upper area of the central chamber by way of a crown of vanes that can be pivoted for control.
  • This upper area has a lower outlet through which the extraction of a first fraction of decanted particles is carried out by gravity and it has an upper outlet from which a pipe starts leading the air current and non-decanted fine particles to the cyclone.
  • Figure 1 shows the general construction of the installation which includes a separator mill comprising a milling chamber (1) and a static or dynamic separator (2) arranged on the milling chamber (1) and means for making an air current circulate in an ascending direction through the separator mill.
  • the installation is supplemented with a cyclone (3) and a sleeve filter (4) through which the air current with the fine particles also passes for its recovery.
  • the milling chamber (1) of the mill comprises a rotor (5) with a vertical axis and a rigid wall (6) coaxially surrounding the rotor (5).
  • the means for making the ascending air current circulate comprise an air inlet (7) in the lower part of the milling chamber (1) which can be connected to a hot gas generator (26) and an outlet after the sleeve filter (4) which is connected to a main suction fan (8).
  • a refrigeration system is provided for the belt housing and bearings as well as for the lubrication oil.
  • the static separator (2) is formed by two coaxial walls, one internal wall (11) and one external wall (12) with a circular contour and section decreasing in a descending direction, forming two coaxial cones which delimit a central chamber (13) and an annular chamber (14).
  • the central chamber (13) is subdivided into two independent areas, one lower area (15) and one upper area (16).
  • the lower area (15) leads into the milling chamber (1) and has a lateral inlet (17) which passes through the annular chamber (14) and serves for the supply to the mill of the material to be milled, which falls through a central passage (18) into the milling chamber (1).
  • the upper area (16) has a lower outlet (19) for the extraction of a first fraction of fine particles.
  • the annular chamber (14) leads, at the bottom, into the milling chamber (1) and is connected, at the top, to the upper area (16) by way of a crown (20) of pivotable blades.
  • the upper area has a second central upper mouth (21) from which a pipe (22) as, for example a telescopic pipe, starts leading the ascending air current to the cyclone (3), Figure 1 .
  • the ascending air current has the function of removing as many particles as possible milling chamber (1) from those which have reached a sufficiently reduced size, which we call fine particles, from the milling chamber (1) and carrying them to the static separator (2).
  • the first one is to clean the milling chamber (1) of small particles which aid, to a lesser extent, the effect of milling by collision.
  • the second objective is said particles not to pass together with the rest of the production to the sieving process, but instead to be removed directly in the static separator.
  • Both the main fan (8) of the suction circuit located after the sleeve filter (4) and the rest of the elements of the same, static separator (2), cyclone (3) and sleeve filter (4), are designed as a function of the intended milling capacity since this defines the quantity of material which is intended to be removed from the milling chamber (1) when the air current passes. Said quantity of material determines the required air flow rate in the circuit and this, in turn, determines the dimensions of the rest of the components of the circuit such that the speeds and load losses envisaged in the circuit are obtained.
  • the quantity of material to be processed in the installation and the maximum envisaged moistures of the material in the inlet and outlet will determine the dimensions of the gas generator (26).
  • a static separator (2) with a double cone is installed directly on the mill.
  • the supply of the material to the mill is carried out through the central part of the separator via the central area of the rotor (5) thereof, which must be done to prevent the inlet of fresh air.
  • the flow of air to drag the material will circulate, from the milling chamber (1), between the interior wall (11) and the exterior wall (12) of the static separator (2).
  • the ascending air (or hot gas) current which should have sufficient speed, enters through the lower part of the mill, below the transmission belt housing (10), passes through the milling area, between the rotor (5) and the rigid wall (6) which defines the impact area, dragging the smaller particles, carrying them to the static separator (2) towards the cone formed by the exterior wall (12).
  • the coarse fraction which is extracted through the first discharge mouth (19) will vary as a function of the characteristics of the material and of the adjustments carried out on the available control elements.
  • the smaller particles will be dragged through the upper outlet pipe (22) of the separator to the cyclone (3) installed after the static separator (2) in which the coarser particles should, in turn, be separated from the fine particles in order to be extracted through a third mouth (32).
  • the finer particles will be deposited in the sleeve filter (4) and extracted through a fourth mouth (31).
  • the static separator (2) despite its simplicity, has various control systems for carrying out a determined adjustment of the size of the particles separated therein.
  • the first one is the actual variation of the flow rate of the tail fan (8) which will have a frequency changer since the speed of the air current through the mill and the separator (2) will vary in this way and, with it, the size and quantity of the particles which can be dragged from the mill. This control is limited since minimum parameters must be maintained for the operation of the unit.
  • the second control system is the crown (20) of pivotable vanes of the upper area of the separator whose position influences the passage speed to the upper area (16) and therefore the size of the particles which passes to the same and influences the separation effect which is produced therein.
  • the depth of the telescopic outlet pipe (22) can also be adjusted, which will affect the drag effect produced on the same, as well as the size of the particles that pass towards the subsequent cyclone (3).
  • the static separator (2) in addition to the indicated function, also plays an important role in the drying process, working with hot gases, since the smaller particles circulating through it, in conditions of negative pressure, high speed and intense contact with the gas current, are dried at high speed similar to how a flash dryer functions.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cyclones (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (3)

  1. Installation de meulage pour granulats, qui comprend une meule verticale qui a une chambre de meulage (1) avec un rotor axial vertical (5) et une paroi rigide (6) entourant, de manière coaxiale, ledit rotor (5), l'installation de meulage comprenant une entrée d'air (7) positionnée dans la partie inférieure de la chambre de meulage (1) de la meule, des moyens pour permettre à un courant d'air de circuler dans une direction ascendante à travers la chambre de meulage (1), à partir de ladite entrée d'air (7), avec la capacité d'entraîner, dans la chambre de meulage (1), les fines particules produites dans la chambre de meulage (1) et des moyens pour séparer les fines particules entraînées par le courant d'air, à travers laquelle le courant d'air et les fines particules entraînées par ledit courant d'air peuvent passer ; l'entrée d'air (7) étant positionnée au-dessous du rotor (5) de la chambre de meulage (1) de la meule ; et des moyens pour que le courant d'air circule se composant d'un ventilateur d'aspiration (8) agencé après les moyens pour séparer les fines particules ; et des moyens pour séparer les fines particules comprenant un séparateur statique (2) agencé sur le dessus de la chambre de meulage (1) de la meule, après quoi un cyclone (3) et un filtre à manche (4) sont positionnés, dans lesquelles la séparation successive des particules fines est réalisée selon des tailles décroissantes des particules entraînées, moyennant quoi :
    le séparateur statique (2) comprend deux parois coaxiales, une paroi interne (11) et une paroi externe (12) entre lesquelles une chambre centrale (13) et une chambre annulaire (14) sont délimitées ; la chambre centrale (13) étant divisée en deux zones indépendantes, une zone inférieure (15) qui conduit dans la chambre de meulage (1) et à travers laquelle l'amenée du matériau à meuler est réalisée, et une zone supérieure (16) qui n'est pas raccordée à la chambre de meulage (1), a une sortie inférieure (19) pour l'extraction d'une première partie de particules et a une sortie supérieure par laquelle un tuyau (22) conduit au cyclone (3) dans lequel les particules plus grossières sont séparées des particules fines afin d'être extraites par une troisième embouchure (32) ; et dont la chambre annulaire (14) conduit, au fond, dans la chambre de meulage (1) et est raccordée, au sommet, à la zone supérieure (16) de la chambre centrale (13) au moyen d'une couronne (20) de pales pivotantes.
  2. Installation selon la revendication 1, caractérisée en ce que l'entrée d'air (7) est positionnée au-dessous d'un boîtier de courroie de transmission (10) de la chambre de meulage (1) de la meule.
  3. Installation selon la revendication 1, caractérisée en ce que la paroi interne (11) et la paroi externe (12) ont un contour circulaire avec une section décroissante dans la direction descendante, définissant deux chambres coaxiales coniques.
EP17165714.1A 2016-04-08 2017-04-10 Installation de fraisage pour le sable ou le gravier Active EP3228387B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201630436A ES2637017B1 (es) 2016-04-08 2016-04-08 Instalación de molienda para áridos

Publications (2)

Publication Number Publication Date
EP3228387A1 EP3228387A1 (fr) 2017-10-11
EP3228387B1 true EP3228387B1 (fr) 2019-04-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17165714.1A Active EP3228387B1 (fr) 2016-04-08 2017-04-10 Installation de fraisage pour le sable ou le gravier

Country Status (2)

Country Link
EP (1) EP3228387B1 (fr)
ES (2) ES2637017B1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107930768B (zh) * 2017-11-17 2019-10-18 乐山新天源太阳能科技有限公司 粉末硅料分级回收系统
CN110420684B (zh) * 2018-05-21 2021-04-02 浙江昊星机械设备制造有限公司 一种低温胶体研磨装置
CN108837927A (zh) * 2018-07-05 2018-11-20 珠海市盛西源机电设备有限公司 实体面材颗粒自动粉碎设备技术生产方法
RU190879U1 (ru) * 2019-04-16 2019-07-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Новосибирский государственный аграрный университет" Вертикальный измельчитель фуражного зерна
CN119968235A (zh) * 2022-10-06 2025-05-09 吉布尔法伊弗股份公司 用于加工粗料的散装材料磨机
CN115337990B (zh) * 2022-10-17 2023-01-10 江苏雅博动物健康科技有限责任公司 一种用于宠物饲料生产的谷物研磨装置
CN115888896B (zh) * 2022-10-31 2024-02-20 河北博翔特种石墨有限公司 一种人造石墨智能型生产设备
CN116943831B (zh) * 2023-09-19 2023-11-28 昆明众康制药有限公司 一种中药材粉碎研磨装置
CN118454794B (zh) * 2024-07-11 2024-09-27 安徽桑瑞斯环保新材料有限公司 一种用于生产石墨烯粉末涂料的粉碎筛选装置

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US2092307A (en) * 1935-06-20 1937-09-07 Peabody Engineering Corp Pulverizer
US3155326A (en) * 1962-04-16 1964-11-03 Richard E Rhodes Ore pulverizer and sizing device
US7156235B2 (en) * 2004-02-26 2007-01-02 Foster Wheeler Energy Corporation Apparatus for and method of classifying particles discharged from a vertical mill
DE102005040519B4 (de) * 2005-08-26 2009-12-31 Loesche Gmbh Verfahren und Vorrichtung zur Vermahlung von heißem und feuchtem Rohmaterial
DE102008038776B4 (de) * 2008-08-12 2016-07-07 Loesche Gmbh Verfahren zur Sichtung eines Mahlgut-Fluid-Gemisches und Mühlensichter
DE102010018046A1 (de) * 2010-04-23 2011-10-27 Loesche Gmbh Verfahren zur Vermahlung von Mahlgut

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP3228387A1 (fr) 2017-10-11
ES2721198T3 (es) 2019-07-29
ES2637017A1 (es) 2017-10-10
ES2637017B1 (es) 2018-07-18

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