Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
  • B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/18—Drum screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/18—Drum screens
  • B07B1/22—Revolving drums
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
  • B07B13/14—Details or accessories
  • B07B13/16—Feed or discharge arrangements

Definitions

• Casting in clay-bonded sand molds often uses numerous sand cores for certain castings, such as engine blocks, cylinder heads, pump housings, and others.
• the cores remain mostly as sand tubers, but also as spent, free-flowing single grains. The used sand is reprocessed into the molding material.
• the device according to the invention thus consists essentially only of two simple components: the rotating screen drum and the bunker-like collecting housing adapted to this, which are separated from one another in at least two
• Housing sections is divided. The amount of equipment and mechanics is low.
• the selection is continuous and automatic.
• the location (s) in the collection housing, where it is subdivided into separate sections, are exactly adjusted to the screening process that takes place in the sieve drum.
• FIG. 1 shows the device in a vertical section in a side view
• FIG. 2 shows the screening device as seen in the direction of the entry end of the screening drum
• Figure 3a, 3b shows a device for selecting sand in two 90 ° views.
• the polygon screen can be seen at the top and the partition element in FIG. 3b at 79 '.
• the screening device 1 comprises a horizontally arranged screening drum 2, the horizontal axis 3 of which is mounted in a housing enclosing the sieve drum 7, which is open at the bottom.
• the inlet end 4 of the screening drum 2 serves to supply the waste sand stream obtained after completion of the casting and demolding operation of the cast parts, which is indicated in FIG. 1 only by the arrow 9.
• a funnel 9a serve for feeding the used sand stream.
• the opposite outlet end 5 of the screening drum 2 is used for discharging during the passage of the drum also by the friction occurring and the existing centrifugal forces not in individual grains dissected sand lumps or dumplings, as indicated by the arrow 10.
• the screen drum 2 is formed polygonal in the illustrated preferred embodiment, as best seen in Figure 2 can be seen.
• the extension of the screening drum 2 can be done gradually, but preferably steadily.
• the diameter enlargement also has the advantage that the friction and the action of centrifugal forces on the sand flow, which promote the singulation and screening of the sand grains, increase towards the rear area of the drum.
• the jacket of the screening drum is supported on the drum shaft 3 by radial struts 6.
• the drum shaft 6 is driven by a drive device 8 near the
• Exit end 5 constantly set in rotation.
• the separated and falling down through the screen wall of the screen drum 2 sand grains fall into a bunker-like collecting housing 11 arranged below the screen drum, whose width and length correspond to the width and length of the screen drum 2.
• the upper edge 12 of the housing 11 is located only slightly below the bottom of the screening device 1.
• the front wall is indicated at 12a and the rear wall at 12b.
• a partition wall 13 whereby a first section 20 is formed, in which the screened in section A single grains are collected. Behind the partition wall 13, a second section 21 of the collecting housing is formed by the latter, in which the individual sand grains which have been sifted out in the remaining section B of the screening drum are collected.
• Drum section B is promoted while the friction and centrifugal forces is exposed, which promotes the grain separation and the screening process.
• the partition wall 13 in the collecting housing 11 begins at the top with a separating edge 14 and has in the lower region 15 two in opposite directions inclined guide elements 15a and 15b, which the groupage from each section 20 and 21 on a down in the section arranged discharge device, such as Derive conveyor belt 16 or 17.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Combined Means For Separation Of Solids (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40192873

Family Applications (1)

Country Status (5)

Cited By (5)

Families Citing this family (3)

Citations (6)

Family Cites Families (3)

• 2007
  • 2007-09-29 DE DE102007046779A patent/DE102007046779A1/de not_active Ceased
• 2008
  • 2008-09-29 CN CN200880109281.7A patent/CN101848778B/zh not_active Expired - Fee Related
  • 2008-09-29 BR BRPI0817613A patent/BRPI0817613A2/pt not_active IP Right Cessation
  • 2008-09-29 WO PCT/EP2008/063040 patent/WO2009043838A1/de active Application Filing
  • 2008-09-29 EP EP08804891A patent/EP2192999A1/de not_active Withdrawn

Patent Citations (6)

Non-Patent Citations (2)

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