• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Vertical mill separator for crushing with separation of fines, which allows the removal of fines from the grinding chamber (1) and also drying the material in the dryer mill assembly, with a rotor (5) with vertical axis and a wall rigid (6) surrounding said rotor, a static or dynamic separator (2) and then a cyclone (3) and a bag filter (4). A rising air current is passed through the grinding chamber (1) and is then directed through the static separator (2). For the recovery, there is a cyclone (3) and bag filter (4) where the fines dragged by the air stream are deposited. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2637017A1
    申请号:ES201630436
    申请日:2016-04-08
    公开日:2017-10-10
    发明作者:José Antonio CHAURE LARRAZ
    申请人:Talleres Alquezar S A；TALLERES ALQUEZAR SA；
    IPC主号:
    专利说明:

    GRINDING GRINDING INSTALLATION Field of the Invention
    The present invention relates to a grinding plant for aggregates, especially aggregates from gravel and quarry, which includes a mill that has a grinding chamber with a vertical axis rotor and a rigid wall that coaxially surrounds said rotor. Background of the invention
    Already known are milling facilities that include mills of the type indicated, intended for the crushing of aggregates from quarries and gravels, in whose mills the material is fed vertically in the center of the rotor that rotates at high speed, so that the feeding material that enters it is radially accelerated and thrown outwards through the channels available to the rotor. Said material impacts at high speed against the rigid coaxial wall with the rotor, which can have different configurations and be formed by a crown of impact plates or a wall formed by the material itself. In these impacts it is in which the grinding of the material takes place, which is discharged from the bottom of the mill to a hopper and from them it is sent to the screening process, so that the fraction that has not sufficiently reduced its size, You can return to the mill again along with the fresh feed.
    The performance of the milling facility described depends on several factors, such as the speed of the rotor, the type of rotor (open or closed) and the arrangement or not of the crown of impact plates.
    In the mills of the exposed type included in the milling facilities, all the crushed product is discharged from the bottom of the mill, including aggregate and particles of different sizes, including fines with particle sizes smaller than 600 microns. Crushed aggregates, together with the fines produced, must be taken to sorting facilities, for their selection and separation, in which these fines constitute the most difficult fractions.
    The material (sand) obtained after classification has to be valid to be used in the manufacture of concrete, asphalt, mortars and other uses.

    The excess of fines, material up to 63 microns, can make this sand invalid for its use and it is necessary to make a subsequent process of elimination of these fines by wet washing or pneumatic separation.
    Product moisture hinders the crushing process and subsequent classification.
    If the product has to be dry, a drying installation before or after the mill is necessary. Description of the invention
    The present invention aims to eliminate the exposed problems, by means of a separating mill that includes a mill of the indicated type, to which the necessary elements are added to perform the separation of fines in the mill itself, so that they do not accompany the aggregates extracted from the bottom of the grinding chamber.
    In this way four objectives are achieved: the first is to clear the grinding chamber of small particles that do not contribute to the effect of collision grinding; The second objective is that the fine particles do not go with the rest of the aggregates to the screening and selection facility, but rather that they are removed directly from the mill, which will contribute to making the subsequent screening of the aggregates more efficient, given that the smallest particles that make up the fines are the most difficult to screen, especially in the presence of moisture; the third objective is that the sand obtained will be within the use for the manufacture of concrete, asphalt, mortar and other uses; The fourth objective is that all the material can be dry.
    The eliminated fines will have a use for different fields in the industry, food .... according to their chemical characteristics.
    A separating mill is designed for which the conventional mill is modified by installing on it a static or dynamic separator adapted to the configuration and geometry of the conventional mill, so that it allows the passage of an ascending air flow through the chamber of milling, which drag the fines from it through the separator where we perform the classification. Subsequently in a cyclone and in a bag filter we collect the fines in two different sizes.

    The air flow may be at room temperature, at times when drying is not required, or be constituted by hot gases produced by a gas generator, which can be included in this type of installation, at times when it is necessary to dry the fines and the rest of the material.
    According to the invention, the separating mill has an air inlet located in the lower part of the grinding chamber of said separating mill, below the rotor and below the transmission belt box thereof. The installation will include means for circulating an upstream air flow through the grinding chamber of the separating mill, from the aforementioned air inlet, whose current will be able to drag the fines produced in said grinding chamber. The installation is completed by means of separation of fines, through which the air stream and fines carried by it are passed.
    The element for circulating the air flow through the mill grinding chamber and the fine separation means will be constituted by a suction fan arranged at the end of the installation and then the fine separation means.
    These fines separation means comprise a static or dynamic separator, which is arranged above the mill's grinding chamber. Next to the separator we have a cyclone and a final bag filter.
    Through the static or dynamic separator, cyclone and bag filter, the variable air current flowing upwards is passed consecutively through the mill's grinding chamber and the fines carried by said current, which are decanted or successively separated according to sizes.
    The static separator is composed of two coaxial walls, an internal wall and another external wall, with cylindrical part and conical part. Between the two walls two cameras are delimited, a central chamber and an annular chamber. The central chamber is subdivided into two zones, one upper and the other lower. The lower area flows inferiorly into the grinding chamber and through it the feeding of the material to be ground is effected. The annular chamber ends inferiorly in the grinding chamber and superiorly is in communication with the upper zone of the

    central chamber, through a crown of adjustable blades for regulation. This upper area has a first discharge port inferiorly, through which gravity extraction of a first fraction of decanted particles is carried out and an upper outlet from which a duct that leads to the cyclone flows air and fine not decanted.
    When we install a dynamic separator at the top we eliminate the blades by said dynamic separator. Brief description of the drawings
    The attached drawings show an exemplary embodiment, in which:
    - Figure 1 shows, schematically, the grinding plant of the invention. - Figure 2 shows in section the assembly of the mill that becomes part of the installation of figure 1. Detailed description of one embodiment
    Figure 1 shows the general constitution of the installation, which includes a separating mill comprising a grinding chamber (1) and a static or dynamic separator (2) disposed on the grinding chamber and means for circulating a flow of upward air through the separator mill. The installation is completed with a cyclone (3) and a bag filter (4), through which the air stream also passes with fines for recovery.
    As can be best seen in Figure 2, the grinding chamber (1) of the mill comprises a rotor (5) with a vertical axis and a rigid wall (6) that coaxially surrounds the rotor (5).
    The means for circulating the upward air flow comprise an air inlet (7) in the lower part of the grinding chamber (1), which can be connected to a hot gas generator (26) and an outlet after the filter of sleeves (4), which is connected to a main fan (8) aspirant.
    The air penetrates through an inlet drawer (9) located under the transmission belt box (10), ascends between the rotor (5) and the rigid wall (6) and passes through

    of the static separator (2), cyclone (3) and bag filter (4), dragging the fines produced during grinding.
    A cooling system is available for the belt and bearing housing, as well as for the lubrication oil.
    The static separator (2) is composed of two coaxial walls, an internal wall (11) and an external wall (12), of circular contour and descending section in descending direction, forming two coaxial cones that delimit a central chamber
    (13) and an annular chamber (14). The central chamber (13) is subdivided into two independent zones, a lower zone (15) and an upper zone (16). The lower area (15) flows into the grinding chamber (1) and has a side inlet (17) that crosses the annular chamber (14) and serves to feed the mill the material to be ground that falls through the central passage (18) in the grinding chamber (1). In the upper area (16) there is a first discharge port (19) inferiorly for the extraction of a first fraction of fines.
    The annular chamber (14) empties inferiorly into the grinding chamber (1) and communicates superiorly with the upper zone (16) through a crown (20) of adjustable blades. The upper area has a second upper central mouth (21), from which a duct (22), for example, of the telescopic type, leads upstream of air to the cyclone (3), figure 1.
    The updraft of air has the function of removing from the grinding chamber (1) as much of the particles that have reached a sufficiently small size, which we call fine, and take them to the static separator (2).
    In this way two objectives are achieved, the first one is to clear the grinding chamber of small particles that contribute to a lesser extent to the effect of collision grinding. The second objective is that these particles do not go along with the rest of the production to the screening process, but that they are removed directly in the static separator.
    This should contribute to making the screening process more efficient, since the smallest particles are the most difficult to screen, especially in the presence of moisture. The rest of the ground material is discharged from the bottom, through an exit hopper (23) and sent to the screening process, returning the fraction whose size is larger than the target to the mill feed.

    As regards the drying process, when hot gases are used, it starts in the grinding chamber itself (1), since the feed material comes into direct contact with the hot gases that arrive from the gas generator
    (26) at the necessary temperature, with heating of the material and rapid cooling of the gases.
    Both the main fan (8) of the suction circuit, located behind the bag filter (4), and the rest of its elements, static separator (2), cyclone (3) and bag filter (4), are designed depending on the expected grinding capacity, since it defines the amount of material to be removed from the grinding chamber as the air stream passes. Said amount of material determines the required air flow in the circuit and this, in turn the sizing of the rest of the circuit components, so that the speeds and load losses expected in the circuit are obtained.
    The amount of material to be processed in the installation and the maximum expected moisture inlet and outlet of the material will determine the size of the gas generator (26)
    As indicated, a double-cone static separator (2) is installed directly on the mill. Through the central part of the same, the material is fed to the mill, on the central area of the rotor (5) of the same, which must be done avoiding the entry of fresh air. The air flow for the entrainment of the material will circulate, from the grinding chamber (1), between the inner wall (11) and the outer wall (12) of the static separator (2).
    The air flow (or hot gases) of upward direction and that must have a sufficient speed, enters through the bottom of the mill, below the box (10) of the transmission belts, crosses the grinding zone, between the rotor
    (5) and the rigid wall (6) that defines the impact zone, dragging the smaller particles by taking them to the static separator (2), towards the cone formed by the outer wall (12).
    In this process of upward circulation, the thickest particles that are dragged by the air stream will eventually fall back to the grinding zone, while the rest of the particles will reach the upper area of the annular chamber (14), will pass through the crown (20) of adjustable blades existing therein and will enter the upper zone (16). In this area there is an effect of

    cyclone, so that larger particles will fall to the bottom of it, to be extracted as finished material, through the first discharge mouth (19).
    The coarse fraction that is extracted through the first discharge mouth (19), will vary depending on the characteristics of the material and the adjustments made in the available control elements. Smaller particles will be dragged through the upper outlet duct (22) of the separator, to the cyclone
    (3) installed next to the static separator (2), in which the coarsest and finest particles must be separated in turn, to be extracted by a second discharge mouth (32).
    The finest particles will be deposited in the bag filter (4) and extracted through a third mouth (31).
    The static separator (2), in spite of its simplicity, has several regulation systems to make a certain adjustment of the size of the particles separated therein. The first is the variation of the tail fan's own flow (8), which will have a frequency inverter, since in this way the speed of the air flow through the mill and the separator (2) will vary and with it the size and quantity of particles that can be dragged from the mill. This regulation is limited, since minimum parameters must be maintained for the operation of the assembly.
    The second regulation system is the crown (20) of adjustable blades of the upper zone of the separator, whose position influences the speed of passage to the upper zone (16) and therefore in the size of the particles that pass thereto and in the separation effect that occurs in it. Finally, the depth of the telescopic exit tube (22) can also be adjusted, which will affect the drag effect produced therein, as well as the size of the particles that will pass into the subsequent cyclone (3). By means of these regulation systems, the particle size of the material that passes through the static separator (2) is adjusted. The amount of material removed at the bottom of the static separator will depend on the characteristics and behavior of the material itself in the grinding and also on the regulation and process parameters.
    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 that are circulating through it, in conditions of depression, high speed and intense contact with the gas stream, dry with great speed, similar to how a flash dryer works.
    权利要求:
    Claims (4)
    [1]
    1.- Installation of grinding for aggregates, which includes a vertical mill that has a grinding chamber (1) with a vertical axis rotor (5) and a rigid wall (6) that coaxially surrounds said rotor, characterized in that It comprises an air inlet (7) located in the lower part of the grinding chamber (1) 5 of the mill, means for circulating an upward flow of air through the grinding chamber (1), from the inlet of air (7), capable of dragging the fines produced in the grinding chamber, and means of separating the fines carried by the air stream, through which the air stream is passed and fines 10 carried by the same; whose air inlet (7) is located below the rotor
    (5) of the milling chamber (1) of the mill; and whose means for circulating the air stream consist of a suction fan (8) arranged next to the fines separation means; and whose fines separation means comprise a static separator (2) disposed above the milling chamber 15 (1) of the mill, following it, a cyclone (3) and a bag filter (4), in which is carried out the successive separation of fines according to decreasing sizes of entrained particles.
    [2]
    2. Installation according to claim 1, characterized in that the air inlet (7) is located below the transmission belt box (10) of the mill grinding chamber.
    [3]
    3. Installation according to claim 1, characterized in that the static separator (2) comprises two coaxial walls, an internal wall (11) and an external wall (12) between which a central chamber (13) and an annular chamber are delimited (14); whose central chamber (13) is subdivided into two independent zones, a lower zone 25 (15) that flows into the grinding chamber (1) and through which the feeding of material to be ground is made, and an upper zone (16 ) which is incommunicated with the grinding chamber (1), has a first discharge port (19) inferiorly, for the extraction of a first fraction of particles, and an upper outlet from which a duct (22) starts. leads to the cyclone (3); and whose annular chamber 30 (14) empties inferiorly into the grinding chamber and is superiorly in communication with the upper zone (16) of the central chamber (13) through a crown (20) of adjustable blades.
    [4]
    4. Installation according to claim 3, characterized in that the inner wall (11) and the outer wall (12) are circular contour, decreasing in descending section, configuring two coaxial conical chambers.
    Fig. 1

    12 11
    1319
    15 175 18 1
    7 9
    Fig. 2
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    同族专利:
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    引用文献:
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    US20050242215A1|2004-02-26|2005-11-03|Foster Wheeler Energy Corporation|Apparatus for and method of classifying particles discharged from a vertical mill|
    US20100043675A1|2005-08-26|2010-02-25|Willy Lohle|Method and Device for Grinding Hot, Wet Raw Material|
    US20110132813A1|2008-08-12|2011-06-09|Loesche Gmbh|Method for classifying a ground material-fluid mixture and mill classifier|CN110420684A|2018-05-21|2019-11-08|温州昊星机械设备制造有限公司|A kind of low temperature colloid grinding device|US2092307A|1935-06-20|1937-09-07|Peabody Engineering Corp|Pulverizer|
    US3155326A|1962-04-16|1964-11-03|Richard E Rhodes|Ore pulverizer and sizing device|
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    法律状态:
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    优先权:
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    ES201630436A|ES2637017B1|2016-04-08|2016-04-08|GRINDING GRINDING INSTALLATION|ES201630436A| ES2637017B1|2016-04-08|2016-04-08|GRINDING GRINDING INSTALLATION|
    ES17165714T| ES2721198T3|2016-04-08|2017-04-10|Grinding installation for aggregates|
    EP17165714.1A| EP3228387B1|2016-04-08|2017-04-10|Milling installation for sand or gravel|
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