Page 23 - february
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METALWORKING EQUIPMENT AND TOOLS
EQUIPMENT OF CONTINUOUS ACTION FOR PROCESSING BULK
MATERIALS IN CASTING PRODUCTION
Let us consider in more detail cooling, and the upper one The experience of the Physico-
the schematic diagrams of the is separating. Heat from hot Technological Institute of Metals and
Alloys (FTIMS NAS of Ukraine, Kiev)
equipment produced by the Institute sand is taken by cooled air in the design of equipment for foundry
FTIMS, which, according to the supplied to the installation and metallurgy shows that most of all
method of processing bulk material, by a fan through pipeline 1 non-standard solutions are required for
belongs to the continuous type or with adjustable gates 2. In equipment for processing bulk materials.
In particular, for the circulation of sand
to the equipment of continuous addition, air-cooling occurs and other free-flowing molding mixtures
operation. For areas using free- due to its passage between during the operations of their cooling
and regeneration, in order to obtain a
flowing molding sands, in particular, pipes 3 in the form of a stable quality of these materials (with
for gasification casting, the method coil, through which water a level of recycling of at least 95%),
of cooling in a fluidized bed is widely flows from the water supply taking into account the compactness,
ease of manufacturing and maintenance
used. This layer, also called "boiling", system or water circulation of installations, reducing their energy
is a heterogeneous system consisting system. Cooled air through consumption, as well as to prevent such
of a layer of silica sand particles and the nozzles-fungi 4 with an deterioration of working conditions in the
shop as dust and noise emission. In terms
a stream of air passing through the ascending flow at certain of technical solutions, such equipment
layer of particles and creating their (called in the hydrodynamics often has no analogues in foundry and
intensive mixing, reminiscent of a of this process critical) speed metallurgy. It is patented by the FTIMS
as an invention or utility model, and
"viscous boiling liquid". At appropriate is supplied to the cooling its examples described below can be
temperatures and gas components, zone and transfers the layer used for many processing, including
the fluidized or fluidized bed simulates of supplied sand to a semi- operations using sand, sand mixtures
the heat-conducting, isothermal and suspended state, which and other bulk materials in a number
of industries. In addition, descriptions
diffusion properties of liquid media, acquires fluidity properties. In of the designs and operating principles
creating conditions in through-type the interval between the two of such equipment are practically not
published in the domestic technical
installations for obtaining uniform cooling walls of the compartment literature, which does not contribute to
by heat exchange with an airflow. Mainly (from one end wall hot sand the spread of progressive technological
due to forced convection. is supplied, and from the processes.
Figure 1 shows a technological other - it is removed) due
element of a fluidized bed cooler to the cold air coming from the holes of the fungi 4 in the
with a capacity of 1 to 6 m3/h, in lower wall of the compartment a fluidized bed is created.
which air and water are used as To retain sand from entrainment with an ascending
refrigerants. The installation consists air flow in the upper part of the compartment there
of three sections of the sectors: the is a "chop" grate 5, through which the purified air is
lower one is air, the middle one is discharged into the ventilation system of the workshop.
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