• 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:
    Method and apparatus for improving the grinding result of a pressure chamber grinder. Finely divided material is fed into a pressurized equalizing tank (2) by a mechanical feeder device (1). The fed material is then transferred into a pre-grinder (3) where the material is fluidized by grinding-gas jets. The fluidized material-gas flow is divided by a bisecting device (6) into two component flows and accelerated through two accelerating nozzles (8) directed towards the centre point of the main grinding chamber (9). The invention is characterized in that the outlet end of main grinding-chamber (9), via an acceleration tube (10), is connected to a free-flow grinder (11) provided with tangentially directed grinding-gas nozzles (12) and wherefrom the ready-ground final product is being removed constantly through a centrally located exhaust pipe (13).
    公开号:SU1706378A3
    申请号:SU874203166
    申请日:1987-07-24
    公开日:1992-01-15
    发明作者:Ниеми Еуко；Тоерия Каарло；Корхонен Хейкки
    申请人:Ой Финнпулва Аб (Фирма)；Кемира Ой (Фирма)；
    IPC主号:
    专利说明:

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    The invention relates to installations for grinding materials with a chamber mill and can be applied in the construction, mining and other industries.
    The purpose of the invention is to increase the grinding efficiency.
    Fig. 1 shows the distribution of particles of the final product using a single grinding chamber operating under pressure, as well as using the proposed facility; Fig. 2 shows a side view installation; on fig.Z - the same, top view.
    The installation contains a mechanical feeder 1, which can be either a cork feeder, with which the fine material to be crushed is directed into the tank 2 to equalize the pressure, the piston or the valve feeder being used as the plug, as shown in FIG. .2 and 3. The material that can be deposited in the container is released with the help of a rotor (not shown) and transported at a predetermined speed to the pre-grinding device 3 by the auger conveyor QV of the container 2 The pressure is practically equal to the pressure in the pre-grinding device 3, in which the material to be ground is affected: several hard gas jets, due to which the material to be ground is boiled. The grinding gas is supplied to the pre-grinding device through the pipe 5. The boiling mixture of gas with the material is directed at high speed from the preliminary grinding device 3 to the separation device 6, in which the gas stream is divided into two streams of equal flow and equal composition. Two output pipes 7 of the separation device 6 are connected to two long acceleration nozzles 8 of a chamber shredder operating under pressure, and these nozzles are in the form of Venturi tubes. The accelerator nozzles 8 are directed in such a way that the streams emanating from them at a high speed collide against each other in the collision zone located in the middle of the main chamber.
    9 grinding. In this collision, highly efficient grinding of the material particles takes place. If by chance the coarse particles contained in the gas mixture with the material come across substantially smaller particles in the main grinding chamber 9, the grinding will be incomplete with respect to these larger particles.
    The gas flow from the main grinding chamber 9 is then directed through an accelerating pipe 10 to a free-flow chopper 11, into which the grinding gas is fed tangentially through the nozzles 12, and the mixture of material with a gas enters the chopper 11 at a high speed and is drawn into a circular a movement in which, under the action of centrifugal force, coarser particles remain in the chopper. 11 is longer and crushed there more thoroughly than smaller particles that leave the grinder 11 almost immediately through the outlet tube 13 located in the center.
    Such a device is well suited for grinding various pigments, in particular for grinding titanium dioxide pigments. For such pigments, the grinding carried out in a chamber chopper operating under pressure is so effective that the majority of the material is crushed to almost the size of the main crystals, and the fraction of the coarse fraction in the final product stream is very small, often less than 1 wt.% consumption of the entire product. Since these coarse particles themselves are very small in size, the subsequent shredder classifies very efficiently and requires very little cost.
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    I
    The conditions for the grinding process should be chosen in such a way that a sufficiently fine material passes through the free-flow shredder quickly, and only relatively large particles undergo grinding in it. By setting the grinding gas supply in such a way that the overpressure in the grinding chamber is
    51 0.5-1.0 kg / cm2, which makes it possible to ensure the velocity of the suspension from the gas with particles at the end of the accelerating pipe 10 more than 250 m / s. Thus, the most favorable conditions for grinding in the free-flow mill 11 are provided.
    According to the invention, compressed air can be used as a chopping gas in both a pressure chamber chamber chopper and a free-flow chopper; for example, compressed air in a chamber chopper and steam in a free-flow chopper, etc. can also be used.
    As a free-flow shredder 11, for example, a conventional disk shredder can be used, in which a homogeneous pre-ground suspension is directed at high speed through an acceleration tube 10 without using a conventional ejection feeder. Nozzles 1.2 for supplying the grinding gas end on the surface of the grinding chamber body. The feed through the accelerating tube 10 is carried out in a direction close to the outer surface of the grinding chamber, which provides an effective push on gas flows that flow out of the nozzles 12. Thus, the insertion point is predominantly outside the circumference, which is formed by the contact points of the gas The jets emanating tangentially from the nozzles 12. Such an arrangement, as well as a high velocity created in the accelerating tube 10, also ensures an efficient classification in the grinding chamber. One end wall of the disk grinder is provided with an outlet tube 13, which terminates in a gas separator in which the final product is separated from the grinder gas.
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    A pressure gauge may be mounted on the accelerating tube 10, the shape of which is predominantly g-lined to the venturi, to monitor the pressure in it.
    Instead of a disk grinder, a so-called tubular grinder can be used as a free-flow grinder. In said tube grinder, the material to be milled is circulated in a closed path, and the final product is discharged through a central outlet to the separator.
    According to the graph shown in Fig. 1, a steeper distribution of particle sizes is provided using a single pressure crusher chamber. The number of particles in percent is plotted vertically, and the size of particles is horizontal. Since the curves intersect at an amount of 50% of the transmitted particles, the average particle size when using both methods is the same.
    For pigments, in the form of titanium dioxide-based pigments, it should be noted that the change provided by the additional crusher relative to the particle size distribution curve is not unambiguous, because of the total amount of material in the additional grinder only a small part of it is processed. In terms of the quality and applicability of the product, there has been a significant improvement, since the pigments are used primarily in the paint industry, as well as in the manufacture of plastics and fibers. In the presence of coarse particles, undesirable protrusions or empty spaces are produced on the colored layer or on plastic films.
    权利要求:
    Claims (6)
    [1]
    1. An apparatus for grinding materials with a pressure chamber chamber mill, comprising a mechanical material feeder, a pressure equalization vessel connected to an -. - charger and having a rotor for loosening the COMKO and a vintogey conveyor for conveying the suitable grinding material in the device pre-grinding, supplied tru7
    a chopping gas pod, separating device connected to a pre-grinding device, having two discharge pipes, each of which is connected to an elongated accelerating nozzle ending in the main grinding chamber, which in order to increase the grinding efficiency, the installation is equipped with a mill with a free stream connected by means of an accelerating tube to the main grinding chamber, the free-flow mill equipped with tangentially directed nozzles for a chopping gas and an exhaust pipe installed in the center for removing the final crushed end product.
    [2]
    2. Installation according to claim 1, wherein the free-flow mill is a disk-shaped jet mill with an outlet pipe in one end wall.
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    [3]
    3. Installation according to claim 5, in which the accelerating tube ends in the zone of effective 5 grinding and classification in a disk-shaped jet mill, so that the feed point is outside the circle, which is in contact with gas jets emanating tangentially 10 nozzles for grinding gas mill.
    [4]
    4. Installation according to claim 3, characterized in that in the center of the opposite end wall there is a mounting feeder through which it is removed. with a portion of the final product from the disc-shaped mill.
    [5]
    5. Installation according to claim 1, in which the accelerating pipe has the shape of a venturi and is equipped with a manometer.
    [6]
    6. Installation pop.Z. differs with the fact that the free-flow mill is made of tubular type.
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    类似技术:
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    GB745804A|1956-02-29|Disintegration of solid materials
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    EP0236469B1|1989-05-17|Grinder housing for a pressure chamber grinder
    US4750677A|1988-06-14|Classifier for comminution of pulverulent material by fluid energy
    US4019688A|1977-04-26|Device for treating loose materials
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    AU597374B2|1990-05-31|Method and apparatus for improving the grinding result of a pressure chamber grinder
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    EP0211117A2|1987-02-25|Method and apparatus for providing finely divided powder
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    JPH0767541B2|1995-07-26|Horizontal swirl type jet mill
    SU1076141A2|1984-02-29|Jet mill
    WO1987003220A1|1987-06-04|Procedure and apparatus for producing classified fines product
    RU2103069C1|1998-01-27|Pneumopercussive vortex mill
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    SU1328002A1|1987-08-07|Installation for disintegration and pneumatic separation of loose materials
    KR0167010B1|1999-01-15|Method and apparatus for reducing fine grain particles by means of compressed fluid
    SU1535655A1|1990-01-15|Method of centrifugal classification of powders
    同族专利:
    公开号 | 公开日
    US4811907A|1989-03-14|
    EP0247106B1|1990-04-11|
    FI854671A0|1985-11-26|
    FI77580B|1988-12-30|
    ES2005083A6|1989-03-01|
    CA1266981A|1990-03-27|
    AU584489B2|1989-05-25|
    AU6720987A|1987-07-01|
    EP0247106A1|1987-12-02|
    DE3670218D1|1990-05-17|
    WO1987003219A1|1987-06-04|
    FI854671A|1987-05-27|
    FI77580C|1989-04-10|
    JPS63501776A|1988-07-21|
    JPH0376184B2|1991-12-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EA008992B1|2004-03-23|2007-10-26|Вильям Грэхем|System and method for pulverizing and extracting moisture|US4189102A|1978-05-10|1980-02-19|Andrews Norwood H|Comminuting and classifying apparatus and process of the re-entrant circulating stream jet type|
    US4248387A|1979-05-09|1981-02-03|Norandy, Inc.|Method and apparatus for comminuting material in a re-entrant circulating stream mill|
    US4502641A|1981-04-29|1985-03-05|E. I. Du Pont De Nemours And Company|Fluid energy mill with differential pressure means|
    FI72897C|1983-03-04|1987-08-10|Finnpulva Ab Oy|Inlet device for a pressure chamber mill facility.|
    US4504017A|1983-06-08|1985-03-12|Norandy, Incorporated|Apparatus for comminuting materials to extremely fine size using a circulating stream jet mill and a discrete but interconnected and interdependent rotating anvil-jet impact mill|FI80617C|1986-05-09|1990-07-10|Finnpulva Ab Oy|FOERFARANDE OCH ANORDNING FOER FOERBAETTRANDE AV MALNINGSRESULTATET I EN TRYCKAMMARKVARN.|
    GB8720904D0|1987-09-05|1987-10-14|Tioxide Group Plc|Mill|
    FI83330C|1988-06-03|1991-06-25|Neste Oy|Process for activating a polymerization catalyst support and a catalyst component obtained by the process|
    FI84032C|1988-11-28|1991-10-10|Finnpulva Ab Oy|Procedure and plant for the classification of extremely finely divided material|
    GB9226994D0|1992-12-24|1993-02-17|Tioxide Group Services Ltd|Method of milling|
    DE19536845A1|1995-10-02|1997-04-03|Bayer Ag|Method and device for producing finely divided solid dispersions|
    EP0803547B1|1996-03-01|2002-06-05|Ciba SC Holding AG|Copper phthalocyanine pigment|
    DE102006048864A1|2006-10-16|2008-04-17|Roland Dr. Nied|Process for the production of finest particles and jet mill therefor and air classifier and operating method thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI854671A|FI77580C|1985-11-26|1985-11-26|OVER ANALYZING FOR OIL FOUNDATION IN THE FURNITURE AND IN THREE CONDITIONS.|
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