EP0010431A1 - Boden für Sandstrahlkammern - Google Patents

Boden für Sandstrahlkammern Download PDF

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Publication number
EP0010431A1
EP0010431A1 EP79302249A EP79302249A EP0010431A1 EP 0010431 A1 EP0010431 A1 EP 0010431A1 EP 79302249 A EP79302249 A EP 79302249A EP 79302249 A EP79302249 A EP 79302249A EP 0010431 A1 EP0010431 A1 EP 0010431A1
Authority
EP
European Patent Office
Prior art keywords
floor
plate
ducting
duct
apertures
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.)
Ceased
Application number
EP79302249A
Other languages
English (en)
French (fr)
Inventor
Eric John Hill
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.)
BTR PLC
BTR Industries Ltd
Original Assignee
BTR PLC
Vacu Blast Ltd
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 BTR PLC, Vacu Blast Ltd filed Critical BTR PLC
Publication of EP0010431A1 publication Critical patent/EP0010431A1/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine

Definitions

  • This invention relates to the recovery of particulate material from an enclosure.
  • it relates to an abrasive blasting cabinet or room wherein the abrasive is conveyed from the enclosure after use in order to be cleaned and reused.
  • Abrasive blasting systems are well known which comprise an enclosure in which articles are subjected to surface treatment by abrasive particles with means to recover and clean the spent abrasive so that it can be re-circulated for use again. Blasting systems which provide these operations are described in British Patent No. 934,088 wherein the abrasive used falls through a fl.oor comprising a plurality of hopper-like pockets and empties through apertures from the pockets into ducts which are situated in rows between the hopper-like pockets.
  • Ventilation is provided by the entry of air through baffled apertures in the roof. The air is then drawn downwards through the hopper apertures, spaced substantially evenly over the entire floor area. The ventilation air also provides the necessary air streams that carry the used abrasive and debris out of the room through the aforementioned ducts.
  • the enclosure described in British Patent No. 934,088, by using a plurality of small hoppers, has a small overall floor thickness compared, for instance, with a single-hopper enclosure.
  • the enclosure can be placed directly on a factory floor, requiring only a shallow ramp for access, or may alternatively be installed in a shallow recess.
  • the floor construction is a complicated arrangement of parts assembled together to provide both the hoppers and the conveying ducts.
  • the present invention provides a greatly improved floor construction for the pneumatic recovery of particulate material, in which substantially the entire under-floor area serves as the conveying ducting for removal of the particulate material.
  • the overall thickness of the floor including the ducting is thereby reduced to a minimum.
  • the floor construction is considerably simplified and the manufacturing costs reduced, compared with, for example, the floor construction described in British Patent No. 934,088.
  • the conveying ducts have a progressively increasing cross section in the direction of flow of air and particulate material. This is to maintain a reasonably uniform air velocity as more air enters the duct through the floor apertures. However a floor with a constant duct section and thus an increasing duct velocity can still give satisfactory performance, at least in small enclosures.
  • an apertured floor plate is spaced above a base plate and the intervening space forms a pneumatic conveying duct; the apertures are determined in size and number to allow a controlled quantity of air to enter the duct and so spaced that, should the complete floor be covered with particulate material, the piles of material within the duct will not unduly restrict the flow of air through the duct.
  • the floor construction may comprise a floor plate which is loose or attached by screws or bolts and can be easily removed so that complete access is obtained to the duct system, e.g. for maintenance.
  • the conveying ducting may for example be divided into sections by baffles extending between upper and lower floor plates, for ease of installation.
  • the orifices controlling the flow of air and particulate material from the enclosure do not have to be of variable size_or pitching in order to provide a substantially even downdraft over the room area, or substantially uniform duct velocity.
  • blast enclosures Although the invention will be discussed in connection with blast enclosures, it can also apply to other types of rooms requiring substantially uniform downdraft and the removal of particles.
  • the simplicity and compactness of the recent construction is such that it can be applied to small blast cabinets, thus enabling them to be placed directly on to a table or bench by the elimination of a hopper or support legs.
  • Figures 1 - 3 show an enclosure 1, with a roof provided with air entries (not shown) walls 2, and a stepped base plate 3 which can conveniently rest on a factory floor or bench.
  • An outlet duct 4 is connected to a fan or similar means (not shown) for creating an air flow 5 along and from the duct. This in turn results in an air flow into the enclosure through the roof, the air flowing vertically downwards as indicated by arrows 6.
  • the operating floor of the enclosure is a floor plate 7, mounted on a secondary floor plate, 8, spaced above the base plate 3, and in the case of a blast room where the operator enters the enclosure, the floor plate 7 provides the working area on which the operator stands.
  • the floor plate 7 is the cabinet work floor on which components are placed for processing.
  • the spacing of the floor plate assembly 7 and 8 above the base plate 3 forms a conveying duct 9, for the removal of air and abrasive from the enclosure 1 into the outlet duct 4.
  • the distance between the secondary floor plate 8 and the base plate 3 is determined by the volume of air being recovered and the air velocity necessary to convey the abrasive particulate material along the conveying duct 9.
  • the floor assembly 7 and 8 is supported on longitudinal supports 10 which also ensure a seal along the side of each floor section to enclose the duct 9.
  • the longitudinal supports also provide attachment for the base plate 3 which is manufactured for convenience in a series of overlapping steps.
  • the perforation size and spacing is such that the air entering results in a constant velocity beneath the plate 8, as the conveying duct height increases, for example from the entry height 13 to the outlet height 14.
  • a convenient practical way to increase the duct height is by forming the base plate 3 in a series of overlapping steps 3a, 3b, etc.
  • a step can be provided wherever the duct velocity has increased to an excessively high figure, and arranged so as to reduce the velocity to that just sufficient to convey the abrasive.
  • the outlet height 14 can be as little as 30 mm for an abrasive blasting room 3m. along the duct length.
  • the abrasive will collect in the conveying duct 9 in the form of piles 15 ( Figure 2) determined by the angle of repose of the material. It is essential therefore, that the spacing of the perforations 12 relative to the outlet height 14, be wide enough so that the piles of abrasive do not restrict the flow of air excessively. This is normally achieved if not more than approximately 50% of the duct area is restricted, viewed in the direction of the air flow.
  • the floor plate 7 which carries any loads within the cabinet or room is provided with large orifices 16, while the secondary plate 8 has perforations 12 whose function is to meter the air and abrasive flow in to the duct 9.
  • the floor plate 7 may be 10 mm thick with 25 mm orifices while the secondary plate may be 3 mm thick with 5mm perforations to provide hopper-like entries spaced over the floor area.
  • the entry aperture 11 is free of any restriction which may occur, for example, owing to a sudden loading of abrasive onto the floor, the conveying duct 9 will be evactuated of all abrasive entering the perforations. This freedom from obstruction is achieved by baffling the entry aperture by means of a generally vertical edge plate 17 protected by a cover plate 18.
  • Figure 4 shows a single inclined plate 19, whjch can be welded between the longitudinal supports 10.
  • a single inclined plate 19 whjch can be welded between the longitudinal supports 10.
  • the inclination of the plate 19 can be constant which will result in some variation if the perforations 12 are regular, although in practice such variation is acceptable. Alternatively the inclination can vary, being shallow at the entry end and steepening towards the outlet as more air enters the perforations.
  • Figures 5 - 8 shows a further version of the invention where the floor plate and base plate are parallel, comprising an enclosure 22 with a roof provided with air entries (not shown), walls 23, and a base plate 24.
  • An outlet duct 25 is con nected to a fan or similar means (not shown) for creating an air flow 26 along and from the duct. This in turn results in an air flow into the enclosure through the roof, the air flowing vertically downwards as indicated by arrows 27.
  • the operating floor of the enclosure is a floor plate 28 spaced above the base plate 24 and as previously described, in the case of a blast room where the operator enters the enclosure, the floor plate 28, provides the working area on which the operator stands.
  • the floor plate 28 is the cabinet work floor on which components are placed for processing.
  • the spacing of the floor plate 28 above the base plate 24 forms a conveying duct 29, for the removal of air and abrasive from the enclosure 22 into the outlet duct 25.
  • the distance between the floor plate 28 and base plate 24 is determined as previously stated by the volume of air being recovered and the air velocity necessary to convey the abrasive particulate material along the conveying duct 29. It is also necessary that the conveying velocity in the duct 29 be substantially constant.
  • the floor plate 28 is supported around all its closed edges b y side supports 30 and end supports 31 to ensure a seal around the floor edge.
  • the plate is further supported by inlet splitter plates 32 and outlet splitter plates 33, which also assist in uniform . distribution of the air flow through the conveying duct 29 into outlet duct 25.
  • the outgoing air flow 26 results in a flow from the enclosure 22, through the floor plate 28.
  • a large proportion, for example one-third, of this flow enters through entry apertures 35 and 36, the remainder being drawn through the perforations 37 in the floor plate 28.
  • the perforation size and spacing is such that the air entering results in a constant velocity beneath the plate 28, as the conveying duct width increases, for example from the entry aperture 35, to the outlet aperture 38.
  • the abrasive will collect in the conveying duct 29, in the form of piles 39 ( Figure 8) determined by the angle of repose of the material. It is essential therefore, that the spacing of the perforations 37 be wide enough so that the piles of abrasive do not restrict the flow of air excessively. This is normally achieved if not more than 50 % of the duct area is restricted, viewed in the direction of the air flow.
  • the end 40 of the duct wall plate 13 will be so positioned that the width of the duct 29 at the entry aperture 35, is approximately one-third of the width at the outlet aperture 38.
  • the other end of the duct wall plate will be approximately mid-way between the side support 30 (or splitter plate 32), and the splitter plate 33.
  • the paths taken by the air flow are indicated by arrows in Figures 5 - 8.
  • the conveying duct 29 will be evacuated of all abrasive entering the perforations. This freedom from obstruction is achieved by baffling the entry aperture by means of a vertical surround 42, protected by a cover plate 43.
  • the perforations may be of variable size and spaced irregularly to provide a completely uniform air flow over the floor area in the conveying duct.
  • the perforations may also be shaped in cross section, for example a conical entry section may be provided to reduce the air entry loss and attenuate the noise created by the air entering the orifices.
  • the outlet duct 4 or 25 is shown connected across the floor duct outlets and would, therefore, increase in cross sectional area towards the recovery fan or similar means, the floor outlets may be connected by means of a fishtail either running horizontally or vertically into a single duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Floor Finish (AREA)
EP79302249A 1978-10-19 1979-10-17 Boden für Sandstrahlkammern Ceased EP0010431A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4124678 1978-10-19
GB7841246 1978-10-19

Publications (1)

Publication Number Publication Date
EP0010431A1 true EP0010431A1 (de) 1980-04-30

Family

ID=10500451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302249A Ceased EP0010431A1 (de) 1978-10-19 1979-10-17 Boden für Sandstrahlkammern

Country Status (1)

Country Link
EP (1) EP0010431A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3545158A1 (de) * 1985-12-20 1987-06-25 Hahn Ortwin Adaptives regelungsverfahren fuer schweissprozesse
EP0642888A1 (de) * 1993-09-07 1995-03-15 Conchita Holding S.A. Sandstrahlvorrichtung
EP0673717A1 (de) * 1993-09-13 1995-09-27 Antonio Frezzella Verfahren und Vorrichtung, arbeitend mit einem automatischen, geschlossenen Kreislauf, zum staubfreien Reinigen von Monumenten und Gebäuden
CN102695587A (zh) * 2010-11-29 2012-09-26 新东工业株式会社 具备抑制喷射材料及粉尘向内壁面附着的喷丸加工室的喷丸加工装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912918A (en) * 1957-06-25 1959-11-17 William H Mead Blast room with uniform down-draft ventilation
DE1090134B (de) * 1954-09-15 1960-09-29 Vacu Blast Ltd Sandstrahlkammer
GB934088A (en) * 1961-10-17 1963-08-14 Vacu Blast Ltd Improvements in or relating to abrasive-blasting systems
DE1217240B (de) * 1961-10-26 1966-05-18 Vacu Blast Ltd Boden einer Sandstrahlkammer
US3407719A (en) * 1967-04-28 1968-10-29 Zero Mfg Company Blast room with uniform down-draft ventilation
US3512469A (en) * 1967-04-28 1970-05-19 Zero Manufacturing Co Floor for blast room with uniform down-draft ventilation
US3657991A (en) * 1970-05-18 1972-04-25 Zero Manufacturing Co Floor for blast room with uniform down-draft ventilation
DE2254458A1 (de) * 1971-11-09 1973-05-30 Key Engineering Vorrichtung zum wiedergewinnen von schleif- bzw. strahlmitteln fuer die verwendung bei strahlanlagen
DE2137058B2 (de) * 1970-09-22 1973-11-08 Vacu-Blast Corp., Belmont, Calif. (V.St.A.)
DD103184A1 (de) * 1973-02-08 1974-01-12
GB1449941A (en) * 1974-03-12 1976-09-15 Vacu Blast Ltd Apertured floor structure and receiver for particulate material
DE2608847A1 (de) * 1976-03-04 1977-09-08 Schlick Kg Heinrich Boden einer sandstrahlkammer

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1090134B (de) * 1954-09-15 1960-09-29 Vacu Blast Ltd Sandstrahlkammer
US2912918A (en) * 1957-06-25 1959-11-17 William H Mead Blast room with uniform down-draft ventilation
GB934088A (en) * 1961-10-17 1963-08-14 Vacu Blast Ltd Improvements in or relating to abrasive-blasting systems
DE1217240B (de) * 1961-10-26 1966-05-18 Vacu Blast Ltd Boden einer Sandstrahlkammer
US3407719A (en) * 1967-04-28 1968-10-29 Zero Mfg Company Blast room with uniform down-draft ventilation
US3512469A (en) * 1967-04-28 1970-05-19 Zero Manufacturing Co Floor for blast room with uniform down-draft ventilation
US3657991A (en) * 1970-05-18 1972-04-25 Zero Manufacturing Co Floor for blast room with uniform down-draft ventilation
DE2137058B2 (de) * 1970-09-22 1973-11-08 Vacu-Blast Corp., Belmont, Calif. (V.St.A.)
DE2254458A1 (de) * 1971-11-09 1973-05-30 Key Engineering Vorrichtung zum wiedergewinnen von schleif- bzw. strahlmitteln fuer die verwendung bei strahlanlagen
DD103184A1 (de) * 1973-02-08 1974-01-12
GB1449941A (en) * 1974-03-12 1976-09-15 Vacu Blast Ltd Apertured floor structure and receiver for particulate material
DE2608847A1 (de) * 1976-03-04 1977-09-08 Schlick Kg Heinrich Boden einer sandstrahlkammer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RECKNAGEL-SPRENGER, Taschenbuch fur Heizung + Klimatechnik, 1977, R. OLDENBOURG, Munchen-Wien, * Page 975, figures 336- 20, 336- 22, page 1318 * *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3545158A1 (de) * 1985-12-20 1987-06-25 Hahn Ortwin Adaptives regelungsverfahren fuer schweissprozesse
EP0642888A1 (de) * 1993-09-07 1995-03-15 Conchita Holding S.A. Sandstrahlvorrichtung
EP0673717A1 (de) * 1993-09-13 1995-09-27 Antonio Frezzella Verfahren und Vorrichtung, arbeitend mit einem automatischen, geschlossenen Kreislauf, zum staubfreien Reinigen von Monumenten und Gebäuden
CN102695587A (zh) * 2010-11-29 2012-09-26 新东工业株式会社 具备抑制喷射材料及粉尘向内壁面附着的喷丸加工室的喷丸加工装置

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Inventor name: HILL, ERIC JOHN