EP4359168A1 - Cleaning the abrasive belt by blowing it off by means of an air knife - Google Patents

Cleaning the abrasive belt by blowing it off by means of an air knife

Info

Publication number
EP4359168A1
EP4359168A1 EP21789812.1A EP21789812A EP4359168A1 EP 4359168 A1 EP4359168 A1 EP 4359168A1 EP 21789812 A EP21789812 A EP 21789812A EP 4359168 A1 EP4359168 A1 EP 4359168A1
Authority
EP
European Patent Office
Prior art keywords
air
grinding
blowing
belt
sword
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.)
Pending
Application number
EP21789812.1A
Other languages
German (de)
French (fr)
Inventor
Stephan KÜNDIG
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.)
Kuendig Ag
Original Assignee
Kuendig Ag
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 Kuendig Ag filed Critical Kuendig Ag
Publication of EP4359168A1 publication Critical patent/EP4359168A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/08—Dust extraction equipment on grinding or polishing machines specially designed for belt grinding machines

Definitions

  • the invention relates to the field of belt grinding technology.
  • the prior art is devices on belt grinding machines for blowing off grinding dust on workpieces and on grinding belts.
  • the dust on the latter is either blown off continuously, intermittently or in pulses during the grinding process either through a rod-shaped tube with holes or slots, i.e. a nozzle acting across the entire width of the grinding belt, or via rotating, star-shaped blasting nozzles set in rotation by the air jet.
  • the compressed air requirement is considerable, especially with the first solution, and the costs are correspondingly high.
  • the main factor is the technical complexity, again with correspondingly high costs.
  • the present invention solves the problem of generating an air jet acting on the grinding belt by means of a technically simple and energy-saving and therefore also cost-effective method and describes the device required for this. In doing so, she made use of a device known from other areas of application for the first time, the so-called air sword (also known as an air blade). This is usually used to separate air masses (e.g. air curtains at entrance gates), to dry surfaces or to clean workpieces or other objects.
  • air sword also known as an air blade
  • the air sword is characterized by the fact that an air volume fed by a fan and a supply pipe in a container is reduced by reducing its cross section to a narrow gap of a few millimeters slot width, from which a continuous air jet, in the present case hitting a grinding belt , exit.
  • the invention also includes such an air sword in a serial, upstream and downstream extension of the method, which describes solutions for the supply of air as well as for its outlet.
  • the invention In addition to a qualitative, because more uniform, improvement in the removal of dust from the sanding belt, the invention also brings about economic advantages compared to the most common device today with the air tube provided with holes. While the latter works with compressed air, i.e. only achieves an efficiency of around fifty percent due to the potentially increasing energy requirement to generate the high pressure, the air sword, with its larger air flow, has an efficiency of around one hundred percent due to the linear energy requirement.
  • the slot width of the air outlet gap (2) is usually about 1-5 mm, the openings for returning the contaminated air a multiple of this.
  • the air chamber (5) can be equipped with correspondingly acting deflectors (6) to achieve a uniform and continuous air jet (3).
  • the required air supply is obtained from the room air by means of a fan. If the belt grinding machine has a vacuum clamping device (10) for fixing the workpieces (15), the air can be supplied from this device and an additional fan is therefore not required.
  • the air in the room gets into the air blade via the perforations in the feed table and the conveyor belt.
  • the reduced air supply must be compensated for in other ways.
  • the air supply reduction is determined by the creation of a negative pressure, insofar as this is not already recorded and controlled by the control system when the workpiece is loaded is balanced. In both cases, compensation is provided by a flap or diverter (13), for example equipped with a servomotor (14) in the room air intake pipe.
  • the device which in principle can be used not only for air but also for gases of all kinds, can be modified or expanded as required. This is due to the combination with an ionization system that eliminates the electrical charge of the grinding dust.
  • the device is optimized by a segmented division into several air swords over the entire width of the grinding belt, but an air jet that is only used in the area where the grinding dust accumulates.
  • the air blade (or several air blades) can be fed in with a single or multiple connections (4) both from the side and from above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention relates to a method for cleaning an abrasive belt by means of an air knife extending continuously over the entire working width or by means of a plurality of segmented air knifes, and to a device that surrounds said air knife or said air knives with an extraction hood (8) used to lead away the dust-laden air. If said device is used for a belt grinding machine that is equipped with a workpiece vacuum device, the expenditure for the air supply is reduced to a lesser need for fans by virtue of the use of a diverter.

Description

Beschreibung description
Bezeichnung der Erfindung / Titel Designation of the invention / title
Reinigung des Schleifbandes durch Abblasung mittels Luftschwert Gebiet der Technik Cleaning of the abrasive belt by blowing it off with an air knife Field of technology
Die Erfindung bezieht sich auf das Gebiet der Bandschleiftechnik. The invention relates to the field of belt grinding technology.
Stand der Technik und Gegenstand der Erfindung Stand der Technik sind Vorrichtungen auf Bandschleifmaschinen zur Abblasung von Schleifstaub auf Werkstücken und auf Schleifbändern. Der Staub auf letzteren wird entweder durch ein mit Löchern oder Schlitzen versehenes stabförmiges Rohr, also eine über die ganze Breite des Schleifbandes wirkende Düse, oder über drehbare, durch den Luftstrahl in Rotation gebrachte, sternförmige Abstrahldüsen während des Schleifvorganges kontinuierlich, interimistisch oder pulsierend abgeblasen. Der Druckluftbedarf ist vor allem bei der ersten Lösung beträchtlich und die Kosten entsprechend hoch. Bei der zweitgenannten Vorrichtung fällt in erster Linie der technische Aufwand ins Gewicht, wiederum unter entsprechend hoher Kostenfolge. Beide bisher verbreiteten Vorrichtungen haben zudem den Nachteil, dass sie, auch wenn dank ihrer zumeist oszillierenden Bewegungen nur bedingt, punktuell wirken und das so ungleichmässig gesäuberte Schleifband auf heiklen Werkstückoberflächen eine entsprechend sichtbare Ungleichmässigkeit des Schleifbiids hinterlässt. Die vorliegende Erfindung dagegen löst die Aufgabe zur Erzeugung eines auf das Schleifband wirkenden Luftstrahls mittels einem technisch einfachen und energiesparenden und damit auch kostengünstigen Verfahren und beschreibt die hierfür erforderliche Vorrichtung. Dabei macht sie erstmals Gebrauch auf ein in anderen Anwendungsbereichen bekanntes Gerät, das sogenannte Luftschwert (auch bekannt als Luftklinge). Übliche Verwendung findet dieses zur Trennung von Luftmassen (z.B. Luftschleier bei Eingangstoren), zur Trocknung von Oberflächen oder zur Reinigung von Werkstücken oder sonstigen Objekten. PRIOR ART AND SUBJECT OF THE INVENTION The prior art is devices on belt grinding machines for blowing off grinding dust on workpieces and on grinding belts. The dust on the latter is either blown off continuously, intermittently or in pulses during the grinding process either through a rod-shaped tube with holes or slots, i.e. a nozzle acting across the entire width of the grinding belt, or via rotating, star-shaped blasting nozzles set in rotation by the air jet. The compressed air requirement is considerable, especially with the first solution, and the costs are correspondingly high. In the case of the second-mentioned device, the main factor is the technical complexity, again with correspondingly high costs. Both previously used devices also have the disadvantage that they only work to a limited extent thanks to their mostly oscillating movements, and the abrasive belt that has been cleaned unevenly in this way leaves a correspondingly visible unevenness in the grinding pattern on delicate workpiece surfaces. The present invention, on the other hand, solves the problem of generating an air jet acting on the grinding belt by means of a technically simple and energy-saving and therefore also cost-effective method and describes the device required for this. In doing so, she made use of a device known from other areas of application for the first time, the so-called air sword (also known as an air blade). This is usually used to separate air masses (e.g. air curtains at entrance gates), to dry surfaces or to clean workpieces or other objects.
Das Luftschwert zeichnet sich dadurch aus, dass ein durch einen Ventilator und ein Zuführrohr gespiesenes Luftvolumen in einem Behältnis durch eine Verringerung dessen Querschnitts auf einen schmalen Spalt von wenigen Millimetern Schlitzbreite reduziert wird, von welchem ein kontinuierlicher Luftstrahl, im hier vorliegenden Fall auf ein Schleifband treffend, austritt. The air sword is characterized by the fact that an air volume fed by a fan and a supply pipe in a container is reduced by reducing its cross section to a narrow gap of a few millimeters slot width, from which a continuous air jet, in the present case hitting a grinding belt , exit.
Die Erfindung bezieht ein solches Luftschwert zudem in eine serielle, vor- und nachgelagerte Erweiterung des Verfahrens ein, welche sowohl Lösungen für die Zufuhr der Luft wie auch für deren Abgang beschreibt. The invention also includes such an air sword in a serial, upstream and downstream extension of the method, which describes solutions for the supply of air as well as for its outlet.
Die Erfindung erbringt nebst einer qualitativen, da gleichmässigeren Verbesserung der Staubentfernung vom Schleifband auch wirtschaftliche Vorteile gegenüber der heute verbreitetsten Vorrichtung mit dem mit Löchern versehenen Luftrohr. Während letztere mit Druckluft arbeitet, also aufgrund des potenziell zunehmenden Energiebedarfs zur Erzeugung des hohen Drucks nur einen Wirkungsgrad von etwa fünfzig Prozent erzielt, weist das Luftschwert mit seinem zudem grösseren Luftstrom aufgrund des linearen Energiebedarfs einen solchen von gegen hundert Prozent aus. Kurze Beschreibung der Zeichnungen In addition to a qualitative, because more uniform, improvement in the removal of dust from the sanding belt, the invention also brings about economic advantages compared to the most common device today with the air tube provided with holes. While the latter works with compressed air, i.e. only achieves an efficiency of around fifty percent due to the potentially increasing energy requirement to generate the high pressure, the air sword, with its larger air flow, has an efficiency of around one hundred percent due to the linear energy requirement. Brief description of the drawings
Zur Illustration der vorliegenden Patentanmeldung dienen: The following serve to illustrate the present patent application:
- die Zeichnung 1, die Erfindung zeigend, ein auf das Schleifband (7) wirkendes Luftschwert mit dem Luftzufuhrrohr (1), dem Luftaustrittsspalt (2), welchem der Luftstrahl (3) entweicht, optionalen Luftanschlussrohren (4) und das Luftschwertgehäuse (5) mit innenliegenden Deflektoren (6) - Drawing 1, showing the invention, an air sword acting on the grinding belt (7) with the air supply pipe (1), the air outlet gap (2) from which the air jet (3) escapes, optional air connection pipes (4) and the air sword housing (5) with internal deflectors (6)
- die Zeichnung 2, mit wiederum dem Luftschwert und dessen Luftaustrittsspalt (2), dem Luftzufuhrrohr (1) und den Luftaustrittsströmen (3) und der Luftkammer (5), ergänzt um die Absaughaube (8) und das Abgangsrohr (9) für die schleifstaubbelastete Luft - Drawing 2, again with the air sword and its air outlet gap (2), the air supply pipe (1) and the air outlet streams (3) and the air chamber (5), supplemented by the suction hood (8) and the outlet pipe (9) for the grinding dust-loaded Air
- die Zeichnung 3, die Vorrichtung und den abblasenden Luftstrom 3 der Zeichnung 2, sowie die Luftabsaugungsströmung 16 im Querschnitt zeigend- the drawing 3, the device and the blow-off air flow 3 of the drawing 2, as well as the air suction flow 16 in cross section showing
- die Zeichnung 4, die Luftbewegungen darstellend, wenn die Band- Schleifmaschine nebst dem Luftschwert über eine Werkstückvakuumspannvorrichtung (10) mit einer Transportteppich- und Arbeitstischlochung zur Fixierung eines Werkstücks 15, durch welche hier die Luftzufuhr (11) erfolgt, verfügt, sodass bei dieser Installation ein einziger Ventilator (12) und eine Weiche (13) mit einem Stellmotor (14) im Anschlussrohr (1) für eine optimierte Luftversorgung genügt - Drawing 4, showing the air movements, when the belt grinding machine, in addition to the air sword, has a workpiece vacuum clamping device (10) with a transport carpet and work table perforation for fixing a workpiece 15, through which the air supply (11) takes place here, so that in this Installation of a single fan (12) and a switch (13) with a servomotor (14) in the connection pipe (1) is sufficient for an optimized air supply
Beschreibung der Ausführungsformen Gegenstand der Erfindung ist ein während des Schleifvorgangs ein Schleifband (7) reinigendes Luftschwert, wie es eingangs unter „Stand der Technik und Gegenstand der Erfindung“ beschrieben wird. Mit Bezug auf den (mit den bisherigen Geräten der Schleifbandabblasung nicht erfüllbaren) Anspruch, die mit Schleifstaub belastete Luft nicht in die Maschine austreten (und sie so verschmutzen) zu lassen, zeichnet sich diese Anordnung zudem durch eine oder mehrere weitere, das Luftschwert umgebende Kammern und Öffnungen aus, durch welche die verschmutzte Luft zu einer den Staub filtrierenden Absauganlage abgesogen wird, dies beispielsweise in Form einer Staubabsaughaube (8). Um einen Luftstrahl (3) von vorzugsweise etwa 25 - 40 m/s Geschwindigkeit zu erzielen, wird die Schlitzbreite des Luftaustrittsspalts (2) in der Regel etwa 1-5 mm betragen, die Öffnungen für die Rückführung der verunreinigten Luft ein Mehrfaches hievon. Zudem kann die Luftkammer (5) zur Erzielung eines gleichmässigen und kontinuierlichen Luftstrahls (3) mit entsprechend wirkenden Deflektoren (6) ausgestattet sein. Die erforderliche Luftzufuhr wird mittels Ventilators aus der Raumluft gewonnen. Verfügt die Bandschleifmaschine über eine Vakuumspannvorrichtung (10) zur Fixierung der Werkstücke (15), so kann die Luftzufuhr ab dieser erfolgen und damit auf einen zusätzlichen Ventilator verzichtet werden. Hierbei gelangt die Raumluft über die Lochung des Vorschubtisches und des Transportbandes ins Luftschwert. Dies ungehindert allerdings nur, soweit die Lochungen frei bleiben (d.h. nicht ihre eigentliche Zweckbestimmung zur Werkstückfixierung erfüllen). Sind Löcher durch Werkstücke bedeckt, muss die reduzierte Luftzufuhr anderweitig kompensiert werden. Festgestellt wird die Luftzufuhrreduktion durch die Entstehung eines Unterdrucks, soweit sie nicht bereits steuerungstechnisch bei der Werkstückbeschickung erfasst und ausgeglichen wird. Die Kompensation erfolgt in beiden Fällen durch eine Klappe oder Weiche (13), beispielsweise bestückt mit einem Stellmotor (14) im Raumluftansaugrohr. Description of the embodiments The subject matter of the invention is an air sword that cleans a grinding belt (7) during the grinding process, as described at the outset under “Prior art and subject matter of the invention”. With regard to the (Unable to be fulfilled with the previous devices for blowing off the sanding belt) of not letting the air contaminated with sanding dust escape into the machine (and thus soiling it), this arrangement is also characterized by one or more additional chambers and openings surrounding the air knife, through which the polluted air is sucked off to a dust-filtering extraction system, for example in the form of a dust extraction hood (8). In order to achieve an air jet (3) with a speed of preferably about 25-40 m/s, the slot width of the air outlet gap (2) is usually about 1-5 mm, the openings for returning the contaminated air a multiple of this. In addition, the air chamber (5) can be equipped with correspondingly acting deflectors (6) to achieve a uniform and continuous air jet (3). The required air supply is obtained from the room air by means of a fan. If the belt grinding machine has a vacuum clamping device (10) for fixing the workpieces (15), the air can be supplied from this device and an additional fan is therefore not required. The air in the room gets into the air blade via the perforations in the feed table and the conveyor belt. However, this is only unhindered if the perforations remain free (ie do not fulfill their actual purpose of fixing the workpiece). If holes are covered by workpieces, the reduced air supply must be compensated for in other ways. The air supply reduction is determined by the creation of a negative pressure, insofar as this is not already recorded and controlled by the control system when the workpiece is loaded is balanced. In both cases, compensation is provided by a flap or diverter (13), for example equipped with a servomotor (14) in the room air intake pipe.
Die Vorrichtung, die grundsätzlich nicht nur für Luft, sondern auch für Gase aller Art verwendbar ist, kann bedarfsweise modifiziert oder erweitert werden. So durch den Verbund mit einer lonisierungsanlage, die die elektrische Ladung des Schleifstaubs eliminiert. The device, which in principle can be used not only for air but also for gases of all kinds, can be modified or expanded as required. This is due to the combination with an ionization system that eliminates the electrical charge of the grinding dust.
Optimiert wird die Vorrichtung durch eine segmentierte Aufteilung auf mehrere Luftschwerter über die ganze Breite des Schleifbandes, aber einem nur im Bereich des Schleifstaubanfalls einsetzenden Luftstrahl. The device is optimized by a segmented division into several air swords over the entire width of the grinding belt, but an air jet that is only used in the area where the grinding dust accumulates.
Die Einspeisung des Luftschwerts (resp. mehrerer Luftschwerter) kann mit einem einzigen oder mehreren Anschlüssen (4) sowohl seitlich wie von oben erfolgen. The air blade (or several air blades) can be fed in with a single or multiple connections (4) both from the side and from above.

Claims

Patentansprüche patent claims
1. Verfahren zur Abblasung eines Schleifbandes zwecks dessen Reinigung während des Schleifvorgangs, dadurch gekennzeichnet, dass der Luftstrahl durch ein Luftschwert erzeugt wird. 1. A method for blowing off a grinding belt for the purpose of cleaning it during the grinding process, characterized in that the air jet is generated by an air sword.
2. Verfahren gemäss Patentanspruch 1 , dadurch gekennzeichnet, dass mehrere, über die Breite des Schleifbandes angeordnete, bedarfsweise einsatzgesteuerte Luftschwerter zum Einsatz kommen 2. The method according to patent claim 1, characterized in that a plurality of air knives, which are arranged over the width of the grinding belt and controlled as required, are used
3. Ein Luftschwert zur Abblasung eines Schleifbandes, dadurch gekennzeichnet, dass es über eine oder mehrere es umgebende Öffnungen zur Rückführung der schleifstaubbelasteten Luft aus dem Schleifmaschinen- innenraum verfügt 3. An air sword for blowing off a grinding belt, characterized in that it has one or more openings surrounding it for returning the air contaminated with grinding dust from the interior of the grinding machine
4. Ein Luftschwert zur Abblasung eines Schleifbandes, dadurch gekennzeichnet, dass die Einspeisung mit Luft mehrseitig erfolgt 4. An air knife for blowing off a grinding belt, characterized in that the air is fed in from several sides
5. Ein Luftschwert zur Abblasung eines Schleifbandes, dadurch gekennzeichnet, dass es die Luft aus der Vakuumspannvorrichtung der selben Schleifmaschinenanlage bezieht 5. An air sword for blowing off a sanding belt, characterized in that it draws the air from the vacuum clamping device of the same sanding machine system
6. Ein Luftschwert gemäss Patentansprüchen 3 und 5, dadurch gekennzeichnet, dass Deflektoren in der Luftkammer den gleichmässigen Luftaustritt aus der Luftkammer optimieren 6. An air sword according to patent claims 3 and 5, characterized in that deflectors in the air chamber optimize the even escape of air from the air chamber
7. Ein Verfahren, dadurch gekennzeichnet, dass ein Luftschwert gemäss Patentanspruch 5 den Luftbezug mittels Klappe oder Weiche regelt 7. A method, characterized in that an air sword according to claim 5 regulates the air intake by means of a flap or switch
8. Ein Verfahren zur Abblasung eines Schleifbandes, dadurch gekennzeichnet, dass ein Luftschwert mit einer oder mehreren es umgehenden Öffnungen zur Rückführung der staubbelasteten Luft des Maschineninnraums die Luft aus der Vakuumspannvorrichtung bezieht 8. A method for blowing off a grinding belt, characterized in that an air knife with one or more openings surrounding it for returning the dust-laden air of the interior of the machine draws the air from the vacuum clamping device
EP21789812.1A 2021-06-25 2021-09-28 Cleaning the abrasive belt by blowing it off by means of an air knife Pending EP4359168A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7402021 2021-06-25
PCT/IB2021/000609 WO2022269307A1 (en) 2021-06-25 2021-09-28 Cleaning the abrasive belt by blowing it off by means of an air knife

Publications (1)

Publication Number Publication Date
EP4359168A1 true EP4359168A1 (en) 2024-05-01

Family

ID=78085966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21789812.1A Pending EP4359168A1 (en) 2021-06-25 2021-09-28 Cleaning the abrasive belt by blowing it off by means of an air knife

Country Status (3)

Country Link
EP (1) EP4359168A1 (en)
CN (1) CN117642255A (en)
WO (1) WO2022269307A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI71250C (en) * 1984-06-20 1986-12-19 Rauma Repola Oy DAMMAVSUGNINGSANORDNING FOER SLIPMASKIN
CH674331A5 (en) * 1988-02-16 1990-05-31 Steinemann Ulrich Ag Belt type grinding machine - has two endless belts with abrasive surfaces which pass around guide rollers and pressed against workpiece by shoes
JP2622070B2 (en) * 1993-07-23 1997-06-18 アミテック株式会社 Sanding machine dust collector
BR112012015314B1 (en) * 2009-12-22 2019-09-03 Metso Paper Inc air exhaust module, air supply module, fiber weft conveyor system, dry end of a fiber weft processing machine and method to prevent dust-laden air from escaping from a zone located in a dry portion of a fiber weft processing machine
DE102017117715A1 (en) * 2017-08-04 2019-02-07 Homag Gmbh Extraction device with optimized dust extraction
DE102019206431A1 (en) * 2019-05-03 2020-11-05 Hymmen GmbH Maschinen- und Anlagenbau Method for producing a structure on a surface

Also Published As

Publication number Publication date
CN117642255A (en) 2024-03-01
WO2022269307A1 (en) 2022-12-29

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