Page 23 - february
P. 23

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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