EP0060394A1 - Vorrichtung zur Reinigung von Giessereialtsand - Google Patents

Vorrichtung zur Reinigung von Giessereialtsand Download PDF

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Publication number
EP0060394A1
EP0060394A1 EP82101066A EP82101066A EP0060394A1 EP 0060394 A1 EP0060394 A1 EP 0060394A1 EP 82101066 A EP82101066 A EP 82101066A EP 82101066 A EP82101066 A EP 82101066A EP 0060394 A1 EP0060394 A1 EP 0060394A1
Authority
EP
European Patent Office
Prior art keywords
hood
sand
diameter
impact
riser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82101066A
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German (de)
English (en)
French (fr)
Inventor
Hermann Jacob
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0060394A1 publication Critical patent/EP0060394A1/de
Withdrawn legal-status Critical Current

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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
    • B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating

Definitions

  • the invention relates to a device for cleaning foundry sand with an essentially vertical riser pipe with an upstream supply option for a preformed air stream, a feed option provided on the riser pipe for the foundry sand to be regenerated and a baffle hood downstream of the riser pipe.
  • Pneumatic regeneration means one in which the used foundry sand, which is not immediately suitable for reuse, is initially used is thrown up by means of pre-tensioned air and is usually thrown against an impact bell or the like as an obstacle. In the event of an impact on the obstacle associated therewith, the binder layers enveloping the individual quartz grains are burst open and removed, so that the quartz grain is receptive to a new binder coating.
  • the above-mentioned pneumatic regeneration system which makes use of a device of the type described at the outset, is known, for example, from DE-PS 22 33 111.
  • the foundry sand to be regenerated as it is given up the biased air flow, N eusand mixed, which is fed to the edge side, through a surrounding with the foundry sand laden air stream feed hopper.
  • the distance between the impact bell and the outlet end of the riser pipe is very small and measures less than the simple diameter of the riser pipe.
  • the baffle is therefore arranged in the immediate area of the pipe outlet end.
  • the use of the energy imparted to the individual grains of sand by the acceleration of the sand by means of the prestressed air flow is guaranteed to achieve regeneration by means of an impact. Because of the close assignment of the baffle bell and the outlet end of the riser pipe, the excessively strongly accelerated smaller sand grains are exposed to a disproportionately large impact load, with the result that they crumble to dust and have to be replaced by new sand, for which purpose the new sand addition is used in the known system.
  • the device designated at the outset with regard to its type is also already known from DE-PS 28 23 578, in the framework of which a further development for avoiding excessive acceleration of the smaller grains of sand is provided, namely in such a way that the outlet end of the riser pipe and the baffle hood in one Are arranged at a distance from each other, which corresponds to at least three times the pipe diameter, and that the outlet end of the riser pipe is surrounded by a collecting funnel or the riser pipe ends in a sand bed.
  • the comparatively small grains of sand do not experience excessively strong acceleration and therefore no excessively violent impact on the impact bell, which would lead to their destruction.
  • the present invention is based on the object of designing the device initially described with regard to its type in such a way that the intensity of the regeneration is improved, i. H. foundry sands with a comparatively very resistant binder layer can also be regenerated quickly and economically.
  • a cylinder jacket is assigned to the impact side of the impact hood, the diameter of which corresponds at least to that of the impact area of the impact hood.
  • this cylinder jacket forms a chamber in which vortices are formed in which the Particles of the foundry sand to be regenerated hold up for a certain time, with each individual particle hitting other particles significantly more often than before, so that extremely resistant binder layers are broken up or rubbed off very quickly because of the increased number of impact processes.
  • the vortex formation mentioned can advantageously be favored in that the end of the cylinder jacket facing away from the impact hood is retracted in diameter, the diameter of the retracted area being larger than the diameter of the riser pipe.
  • An advantageous measure for controlling the formation of the vortex and thus the intensity of the regeneration can consist in that the distance between the outlet end of the riser tube on the one hand and the impact hood or the end of the cylinder jacket facing away from it can be changed. By changing the distance mentioned, the residence time of the particles in the vortex can be changed.
  • the possibility of arranging a baffle plate inclined to the riser pipe axis, the inclination of which can be changeable, around the outlet region of the riser pipe serves to prevent a more or less large portion of the falling back from the impact hood and the cylinder jacket associated therewith only feed partially regenerated sand to the riser pipe with sand that has not yet been regenerated; with a corresponding inclination of the baffle plate, the entire of the impact hood and that associated with it can also be used Cylinder jacket falling back sand are passed on, either to a downstream similar device or immediately for further use.
  • the system consists of a housing which is formed by means of a conventional steel construction 1 with dense wall claddings 2 and which is closed at the top by a dust collecting hood 4 with an extraction nozzle 5.
  • a feed hopper 6 for foundry sand is provided on the right side of the housing 3, while a discharge opening 7 with a slide 8 for regenerated sand is provided on the left side.
  • three impact hoods 9 are each suspended from the steel structure 1 via a hydraulic unit 10.
  • the hydraulic units 10 are used to adjust the height of the impact hoods 9.
  • a cylinder jacket 11 is adjacently assigned to the lower edge of the impact hoods 9, the end 12 of which faces away from the respective impact hood 9 is retracted in diameter.
  • Each unit consisting of impact hood 9 and cylinder jacket 11 is assigned a riser pipe 13 which projects vertically upward from the housing base 14.
  • the risers 13 are adjustable in the vertical direction by means of a hydraulic unit 15, which engages on a bracket 16 of the risers 13.
  • a deflector plate 18 is assigned to the outlet region 17 of the riser pipes 13, and its inclination relative to the riser pipe axis 20 can be adjusted about an axis 19.
  • a plate 21 is provided which serves at the same time for baffle and deflection purposes, the deflection direction of which plate is directed towards a collecting funnel 22 ; is directed.
  • This baffle and deflector plate 21 is also suspended from the steel structure 1 via a hydraulic unit 10.
  • the riser tubes 13 are surrounded by an annular space 23, which exists between an outer tube 24 guided downwards and the riser tube 13.
  • This annular space 23 is used to supply sand which is introduced into the interior of the risers 13 together with a pre-shaped air flow at the lower end of the risers.
  • the primary feed option for sand is at the lower end 27 of the pipe socket 26, which for this purpose is arranged at a distance from an air supply nozzle 28, to which a preformed air stream is supplied from the outside via a pipeline 29.
  • the sand to be regenerated moves through the entire system in the manner just described until it is finally thrown out of the riser pipe 13 adjacent to the discharge opening 7 against the baffle and deflection plate 21 assigned to it, a more or less large proportion this amount of sand is deflected towards the collecting funnel 22.
  • the sand emerging from the collecting hopper 22 through the discharge opening 7 is completely regenerated sand.
  • the discharge opening 7 can be blocked for a corresponding period of time, after which larger amounts of sand accumulate progressively from left to right in the area of the bottom 14 in FIG. 1 with the result that parts of these amounts of sand reach the feed area of the ascending pipe 13 which is immediately to the right.
  • a multiple passage of the sand through the entire system can be achieved, namely whenever the return of sand from a single device to the device immediately provided on the right in FIG. 1 is carried out until the device adjacent to the feed hopper 6 is supplied with sand once passed through the plant. Because of the accumulation of sand returned in this way to the device adjacent to the feed hopper 6, no further sand then flows from the feed hopper 6 into the plant until the discharge opening 7 is opened.
  • bulkhead walls 30 which extend obliquely upward to the right over a certain height are provided in the floor area of the installation.
  • the air supplied via the risers 13 is discharged via the suction nozzle 5 of the collecting hood 4 of the housing 3, expediently by passing it through a dust separator.
  • FIG. 1 The schematic longitudinal section of FIG. 1 by a regeneration system with several erfindungsqemä call devices reveals that a bulkhead 32 is provided between every two according to the invention Vorrichtun q s which extends from top to bottom, with the lower end thereof at a distance from the bottom region of the Facility is provided.
  • the floor area of the system is understood to mean that height which corresponds to the upper end of the annular space 23.
  • the lower end of the bulkhead 32 is arranged at a distance from the diagonally upward bulkhead 30, which distance can be changed in a manner not shown, however, either by vertical upward or downward movement of the bulkhead 32 or by pivoting the bulkhead 30.
  • the bulkhead 32 is used not to feed the sand trickling down from the baffle plate 18 of a first device to the downstream device, but rather to return it to the first-mentioned device if the downstream device is completely filled with the riser pipe and thus any further sand supply to one overcrowding or even constipation. This is achieved in that the sand accumulation and associated slope possible without the bulkhead 32 is reduced by the bulkhead 32 so that the sand trickling down from the baffle plate 18 runs back to the former device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP82101066A 1981-03-18 1982-02-12 Vorrichtung zur Reinigung von Giessereialtsand Withdrawn EP0060394A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813110578 DE3110578A1 (de) 1981-03-18 1981-03-18 Vorrichtung zur reinigung von giessereialtsand
DE3110578 1981-03-18

Publications (1)

Publication Number Publication Date
EP0060394A1 true EP0060394A1 (de) 1982-09-22

Family

ID=6127648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101066A Withdrawn EP0060394A1 (de) 1981-03-18 1982-02-12 Vorrichtung zur Reinigung von Giessereialtsand

Country Status (2)

Country Link
EP (1) EP0060394A1 (enrdf_load_stackoverflow)
DE (1) DE3110578A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003872A1 (de) * 1991-08-14 1993-03-04 Künkel-Wagner Gmbh & Co. Kg Anordnung zum trockenen regenerieren von giesserei-altsanden
US5291935A (en) * 1991-04-10 1994-03-08 Kgt Giessereitechnik Gmbh Process for the mechanical cleaning of foundry used sand
US5941295A (en) * 1996-09-30 1999-08-24 Ag Industries, Inc. System and method for removing crystallized flux

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825361A1 (de) * 1988-07-26 1990-02-08 Hermann Jacob Verfahren und anlage zur regenerierung von giessereialtsandgemischen
DE3909535A1 (de) * 1989-03-22 1990-10-04 Hermann Jacob Vorrichtung zur reinigung von giessereialtsand
EP0465778B1 (de) * 1990-06-28 1997-10-01 Fried. Krupp AG Hoesch-Krupp Verfahren zum Regenerieren von Giesserei-Altsanden
DE4100520C2 (de) * 1990-06-28 1999-08-19 Kuenkel Wagner Prozesstechnolo Verfahren zum Regenerieren von Gießerei-Altsanden
DE4434115C1 (de) * 1994-09-23 1995-11-23 Kgt Giessereitechnik Gmbh Verfahren zur pneumatisch-mechanischen Reinigung von in Gießereien anfallenden Altsanden

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233111A1 (de) * 1972-07-06 1974-01-24 Hermann Jacob Verfahren und vorrichtung zur regenerierung von gebrauchtem giessereisand durch trockene mechanische reinigung im schwebezustand
DE2856536A1 (de) * 1978-04-24 1979-10-25 Nat Eng Co Aufprall-separator zur entfernung von ueberzugsmaterialien von der oberflaeche koernigen gutes
DE2823578B2 (de) * 1978-05-30 1980-04-10 Hermann 2105 Seevetal Jacob Vorrichtung zur Reinigung von Giedereialtsand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233111A1 (de) * 1972-07-06 1974-01-24 Hermann Jacob Verfahren und vorrichtung zur regenerierung von gebrauchtem giessereisand durch trockene mechanische reinigung im schwebezustand
DE2856536A1 (de) * 1978-04-24 1979-10-25 Nat Eng Co Aufprall-separator zur entfernung von ueberzugsmaterialien von der oberflaeche koernigen gutes
DE2823578B2 (de) * 1978-05-30 1980-04-10 Hermann 2105 Seevetal Jacob Vorrichtung zur Reinigung von Giedereialtsand

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291935A (en) * 1991-04-10 1994-03-08 Kgt Giessereitechnik Gmbh Process for the mechanical cleaning of foundry used sand
WO1993003872A1 (de) * 1991-08-14 1993-03-04 Künkel-Wagner Gmbh & Co. Kg Anordnung zum trockenen regenerieren von giesserei-altsanden
US5421462A (en) * 1991-08-14 1995-06-06 Kunkel-Wagner Gmbh & Co. Kg Arrangement for dry reconditioning of used foundry sands
US5941295A (en) * 1996-09-30 1999-08-24 Ag Industries, Inc. System and method for removing crystallized flux

Also Published As

Publication number Publication date
DE3110578A1 (de) 1982-09-30
DE3110578C2 (enrdf_load_stackoverflow) 1989-08-31

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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