Agitating – With heating or cooling – Fluid-filled jacket
Patent
1992-05-19
1994-01-04
Jenkins, Robert W.
Agitating
With heating or cooling
Fluid-filled jacket
366 15, 366 91, B01F 1506
Patent
active
052754855
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for moving solid particles, especially one designed as cooling mixer, having a substantially horizontal jacketed tank, which is passed along its longitudinal axis by a shaft connected to a drive motor and carrying radially extending tools, which when rotating act to mix solid particles contained in the bulk material by setting them into forced movement, and having further charging and discharge openings arranged on the tank and at least two partition walls, provided each with at least one passage opening and arranged in the tank between the charging and the discharge openings, transversely to the longitudinal axis.
A device of this kind has been known from DE-AS 11 12 968.
Devices for mixing solid particles using rotating tools, comprising a horizontal cylindrical tank and a shaft with mixing tools arranged coaxially in the tank, have been known before in the form of batch-type and continuous-type mixers.
In batch-type operation, the machine, which is used as mixer, drier, reactor, or cooler, is at first charged with the bulk material or materials and/or additives to be processed. The charging process, once completed, is followed by a processing operation by which the bulk materials are mixed, cooled, dried, heated, disintegrated or agglomerated. This process may be accompanied also by reactions which may give rise to new products, or may release gases which are then evacuated through suitable vapor pipes. Upon completion of the treating process, the products are discharged from the machine by a separate discharging operation.
For the purpose of determining the time required for preparing solid-particle mixtures by means of batch-type mixers, it is necessary to sum up the charging time required for the bulk materials to be mixed, the discharging time for the finished mixture, and the mixing time as such is required by the batch-type mixer to mix the bulk materials with themselves and with each other by means of the rotating mixing tools. This results in longer mixing times for the batch-type mixer, as compared with continuous-type mixers. In continuous operation, the waiting times required for charging and discharging the mixer do not occur. In continuous operation, the bulk materials to be processed are supplied to the mixer continuously, and at the same time the finished mixture is discharged continuously. This is possible also in the case of bulk materials which are to be subjected to thermal treatment or to be cooled in continuous operation. If a cooling process is to be carried out in continuous operation, the hot solid-particle material is introduced into the cooling mixer, while at the same time the cooled bulk material is extracted from the other end of the cooling mixer.
In continuous operation, however, certain difficulties are encountered with respect to controlling the transport behavior of the bulk materials to be cooled in such a way as to prevent, for example, cooled bulk material to get mixed up with bulk material of higher temperature or even hot bulk material. If reverse mixing occurs, then the mixing temperature of the bulk material in the product space will always be higher than the desired end temperature. And in addition, reverse mixing causes cooled particle populations to stay in the product space longer than the permissible time. Such particle populations may be destroyed by the mixing tools, being subjected to prolonged mechanical treatment. This makes it necessary, when cooling a flow of bulk materials in continuous operation, to keep the rate of reverse mixing between treated and untreated materials as low as possible. However, it is often not possible with the known devices to control the cooling process in this way since rigidly predetermined process parameters often prevent corresponding operating modes and since, on the other hand, the time required for reducing the temperature in bulk materials by heat transfer to a cooling agent cannot be reduced at desire.
Known mixers normally operate at a rigidly pre
REFERENCES:
patent: 1462602 (1923-07-01), Labus et al.
patent: 3196941 (1965-07-01), Matsuoka
patent: 3480404 (1969-11-01), Upson
patent: 3776529 (1973-12-01), Sutter et al.
patent: 3964874 (1976-06-01), Maruko
patent: 4159740 (1979-07-01), Seiling
Gebruder Lodige Maschinenbau GmbH
Hackler Walter A.
Jenkins Robert W.
LandOfFree
Device for moving solid particles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for moving solid particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for moving solid particles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-302503