WO2002005976A1 - Procede et dispositif de nettoyage d'une surface pendant son fonctionnement - Google Patents

Procede et dispositif de nettoyage d'une surface pendant son fonctionnement Download PDF

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Publication number
WO2002005976A1
WO2002005976A1 PCT/SE2001/001594 SE0101594W WO0205976A1 WO 2002005976 A1 WO2002005976 A1 WO 2002005976A1 SE 0101594 W SE0101594 W SE 0101594W WO 0205976 A1 WO0205976 A1 WO 0205976A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
suction
gas
blower
width
Prior art date
Application number
PCT/SE2001/001594
Other languages
English (en)
Inventor
Fredrik Pontén
Kjell SJÖDIN
Original Assignee
Valmet Fibertech Ab
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 Valmet Fibertech Ab filed Critical Valmet Fibertech Ab
Priority to AU2001271187A priority Critical patent/AU2001271187A1/en
Publication of WO2002005976A1 publication Critical patent/WO2002005976A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G45/00—Lubricating, cleaning, or clearing devices
    • B65G45/10—Cleaning devices
    • B65G45/24—Cleaning devices comprising plural diverse cleaning devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B08B5/023—Cleaning travelling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G45/00—Lubricating, cleaning, or clearing devices
    • B65G45/10—Cleaning devices
    • B65G45/22—Cleaning devices comprising fluid applying means

Definitions

  • the present invention relates to a method for cleaning a surface during operation, which surface is in continuous movement, in accordance with the preamble to claim 1.
  • the invention also relates to a corresponding arrangement in accordance with the preamble to claim 9 and to a plant for manufacturing fibre- board, preferable MDF board, in accordance with claim 20.
  • the term "surface” here covers any object with relatively slight height/depth in comparison with its extension in width or in longitudinal direction.
  • the surface may either be completely impermeable or be made of a more porous or perforated material, more or less permeable to gas.
  • the support surface must usually be cleaned from dust and other material, e.g. pieces of ma- terial/products being transported on the surface, that get caught either on the surface or in the holes in the surface.
  • Normal cleaning methods entail the use of water, preferably hot water, or some other liquid being sprayed against the surface under high pressure. Another common procedure is to suction the surface clean with the aid of negative pressure. The drawbacks of these methods are obvious. When spraying with a liquid precautions must generally be taken to prevent the liquid splashing and spraying outside the surface, which involves extra expense and practical inconvenience. The main problems with suction cleaning are poor efficiency and noise.
  • the present invention relates particularly to cleaning wire conveyor belts for dry processes within the MDF industry where fibreboard of Medium Density Fibre is manufactured.
  • Endless wire belts of material permeable to air are used here for continuous transport of fibre, e.g. to a pre-press that forms part of an MDF fibre production line.
  • the wire belt is often made of some type of nylon fabric having a thickness of 1-5 mm.
  • Various mesh types occur, as well as numerous different types of material, and the thickness may therefore vary greatly.
  • One way of solving the problem of cleaning the wire belt is brushing. However, this is not sufficiently effective in cleaning the spaces in the wire.
  • Another known method of cleaning is a combi- nation of blowing and suction involving blowing with high pressure from the inside of the wire and sucking with the aid of a fan on the other side.
  • a long blow ramp is generally used, having a width approximately corresponding to the width of the wire belt, usua y in the order of 3500 mm. It is obvious that efficiency will be poor with a pressure of 6 bar, the normal pressure for industrial compressed air. Furthermore, it is practically impossible to maintain this pressure continuously since such large pressure losses are incurred that other compressed air equipment in the system stops. The technique of blowing/suction is therefore expensive in relation to the result achieved.
  • the object of the present invention is to solve the above-mentioned problems.
  • blower arrangement and the suction arrangement are moved simultaneously in relation to the surface, in a direction that is substantially transverse to the direction of movement of the surface, to achieve cleaning of an area corresponding to the whole width of the surface.
  • the blower arrangement successively blows gas through only some of a number of blow noz- zles in the blower arrangement, all the nozzles that comprise the blower arrangement together covering an area that at least substantially corresponds to the whole width of the surface, and the successive blowing resulting in an area corresponding to the whole width of the surface being cleaned.
  • the simultaneous movement of the blower arrangement and suction arrangement in the first embodiment, or the "movement" entailed by the successive changing of which blow nozzles gas is blown through in the second embodiment may take place continuously or stepwise.
  • each step preferably has a width substantially corresponding to the width of the area over which the blower arrangement normally blows.
  • the blowing of pressurised gas preferably ceases when the displacement movement ceases.
  • the movement is preferably performed in the form of a to and fro movement over the whole width of the surface.
  • the surface is preferably permeable to gas and the gas passes at least partially through the surface.
  • the blower arrangement blows gas on one side of the surface and the suction arrangement sucks up gas and loose particles on the opposite side of the surface substantially opposite to the blower arrangement. Extremely efficient cleaning is thus obtained, even of all the spaces in the surface.
  • blower arrangement blows gas and the suction arrangement sucks gas and loose particles from the same side of the surface, whereby the suction arrangement sucks up gas that is ricocheted off the surface.
  • This latter embodiment is suitable for a surface where a considerable proportion of the gas and loose particles is ricocheted. It also has the advantage of not requiring space for blower and suction arrangements, respectively, on both sides of the surface, but only on one side.
  • the movement of the blower arrangement and suction arrangement and/ or other functions of the blower or suction arrangements, respectively, are pref- erably controlled by a control unit, suitably a programmable control unit.
  • the whole process can be performed intermittently to better suit the current cleaning requirement and to make it more economical.
  • the intermittent process can be controlled either by some form of automatic means, or manually.
  • the set of blow nozzles in the first embodiment has a total blowing width of between 1/40 and 1/20 of the total width of the surface, but may naturally be varied to a great extent depending on conditions and the requirements of the particular case. This may also apply to the set of blow nozzles through which the gas is currently blown in accordance with the second embodiment. Since each set of blow nozzles generally comprises a plurality of blow nozzles, it will be understood that each such nozzle has an extremely small blow width.
  • the blow nozzles may, for instance, be of the type marketed by Silvent AB and known as air-knives. Each set of blow nozzles comprises between two and six nozzles, for instance. According to the second embodiment several smaller blow ramps may be used, of the type sold under the trademark SIMCO®, for instance.
  • the displacement means for the first embodiment comprises at least one linear unit along which the blow nozzles or suction nozzle(s), respectively, move.
  • a linear unit is preferably used when blowing and suction occur from the same side of the surface.
  • Two linear units are generally required in the first embodiment if the blow nozzles and suction nozzle are arranged one on each side of the surface, i.e. one unit for the blow nozzles and one for the suction nozzle(s).
  • the displacement means also comprises a drive unit, e.g. an electric motor.
  • the arrangement preferably also comprises a control unit, preferably programmable, for controlling the movement of the nozzles and/or their blowing or suction, and/or other functions of the blower arrangement and suction arrangement, respectively.
  • the supply means for pressurised gas thus preferably comprises a regulator and at least one cut-off valve, preferably an automatically con- trolled valve, e.g. an electrically controlled valve. However, it may also comprise a manually operated valve, or both.
  • the invention also relates to a plant for manufacturing fibreboard, preferably MDF board, which is characterized in that it comprises an arrangement as claimed in any of the claims relating to a cleaning arrange- ment for cleaning a surface in the form of a wire conveyor belt for transporting fibre.
  • Figure 1 illustrates an arrangement in accordance with a first embodiment of the present invention, seen from the front
  • Figure 2 is a perspective view of the arrangement shown in fig. 1 ,
  • Figure 3 shows an air preparation system in conjunction with the arrangement in accordance with the invention
  • Figure 4 shows schematically the arrangement illustrated in fig. 1 , seen from the side, when being used for cleaning a wire belt for transport of fi- bre for the manufacture of fibreboard,
  • Figure 5 illustrates an arrangement in accordance with a second embodiment of the present invention, seen from the front
  • Figure 6 shows schematically the arrangement illustrated in fig. 5, seen from the side, when being used for cleaning a wire belt for transport of fi- bre for the manufacture of fibreboard.
  • the first embodiment of the invention depicts a blower arrangement 1 and a suction arrangement 2 arranged one of each side of a surface 4 to be cleaned.
  • This surface is in continuous movement during operation and may be an endless conveyor belt, such as a wire belt.
  • Fig. 1 shows the surface in its direction of movement, which is thus perpendicular to the plane of the figure.
  • the blower arrangement 1 comprises a set of blow nozzles 5 comprising at least one nozzle, a supply means for pressurised gas which is fed in at 6, the gas in the case illustrated being compressed air at 6 bar, and a tube 7 connecting the supply means to the blow nozzles.
  • the set of blow nozzles has a total blowing width that constitutes only a part of the total width of the surface in transverse direction to the direction of movement of the surface.
  • the suction arrangement 2 comprises at least one suction nozzle 10, having a suction width approximately corresponding to the blowing width for the set of blow nozzles, or slightly exceeding this width, a negative pressure source (not shown) and a suction tube 12 connecting the negative pressure source to the suction nozzle.
  • the blow nozzles can be moved in the transverse direction of the surface, along a first linear unit 14 in the form of a guide or rail, for instance, and the suction nozzle is moved in similar manner along a second linear unit 16.
  • An electric motor 18 is used for the actual displacement movement, the out-going shaft of which is suitably connected to the set of blow nozzles and suction nozzle(s), enabling them to move simultaneously and at the same speed.
  • the connection between the electric motor and the blow and suction nozzles, respectively, may con- sist of some type of belt 17, e.g. cogged belts, wires or endless ropes.
  • the suction tube 12 and blowing tube 7 are both arranged with some form of suspension so that each tube can easily be rolled out to accompany the relevant nozzle(s) as they move, without risk of the tube disturbing the movement of the surface or of the nozzles.
  • the displacement movement can be effected with the aid of two jack screws, one jack being connected to an electric motor and then joined to the second jack screw via an intermediate shaft. This produces synchronised operation.
  • a nut runs on each jack screw and is connected to the suction or blower equipment, respectively.
  • the set of blow nozzles is moved simultaneously with the suction nozzle(s) so that they are substantially opposite each other throughout the cleaning process.
  • FIG. 3 illustrates a system for preparing compressed air, suitable for connection to the cleaning equipment in accordance with the present invention. This can advantageously be mounted separately in order to increase accessibility during service.
  • a part of a compressed air tube 19 can be seen here for connection at 6 to the compressed air tube 7 which, in accordance with the invention, connects the blow nozzles to the compressed air preparation system, the latter comprising a regulator 20 with a manometer 21 and also a filter 22.
  • the system also comprises an electric cut-off valve 24, in this case a cut-off valve that is controlled automatically from a control unit (not shown).
  • the system preferably also comprises a manual cut-off valve 25, e.g. a ball valve.
  • the system also comprises a supply means in the form of a compressed air connection 26, preferably to an already existing compressed air system.
  • Figure 4 illustrates an application of the cleaning arrangement in accordance with the first embodiment.
  • the arrangement is used for cleaning a wire belt 30 for transport of fibre to a pre-press forming part of an MDF fibreboard production line.
  • the wire belt 30 is coated with fibre and dust and, in the example illustrated, first passes a brush 31 and thereafter through a cleaning arrangement 32 in accordance with the present invention comprising a blower arrangement 1 and a suction arrangement 2.
  • the speed of the wire belt is normally 20-30 m/min, but speeds of up to 90 m/min are possible.
  • the nozzles preferably move/are moved, at such speed that the wire has time to rotate at least one complete turn during the blowing clean process. Sometimes considerably more turns are required.
  • control unit preferably programmable.
  • a control unit can thus be used to control the speed of the wire and the blowing or suction through the nozzles, as well as the movement of the nozzles over the wire. It may naturally also comprise other control functions.
  • FIG. 5 shows an arrangement in accordance with a second embodiment.
  • a blower arrangement 41 is seen here comprising a number of blow noz- zles in the form of blow ramps 45, mounted in an attachment beam 46.
  • the blower arrangement has five blow ramps 45.
  • the number of blow ramps is chosen so that their total blowing width at least corresponds to the width of the surface to be cleaned.
  • the blow ramps are supplied with compressed air from a compressed air preparation system 50, via compressed air tubes 47.
  • the compressed air preparation system may advantageously be designed as illustrated in fig. 3.
  • the compressed air is supplied, preferably at 6 bar, via a valve package 51 to one blow ramp at a time.
  • the blow ramps preferably have two feed inlets enabling them to distribute the compressed air well.
  • FIG. 6 shows an application similar to that shown in fig. 4. However, an arrangement in accordance with the second embodiment is used here.
  • a cleaning arrangement 52 is shown here, comprising a blower arrangement 41 with blow ramps arranged below a wire belt 60 for transporting fibre.
  • the cleaning arrangement also comprises a suction arrangement 42 arranged above the wire to suck up the air blown out by the blower arrangement, together with dust and fibre the air carries with it.
  • suction is performed by means of one suction nozzle, or possibly several suction nozzles, having a total suction width corresponding to the total width of the wire, and suction occurs all the time across the whole width of the wire.
  • suction arrangement in which suction occurs only over an area opposite the blow ramp currently activated. This can be achieved by means of an arrangement corresponding to the blow ramp arrangement.
  • the suction arrangement can be moved in the same way as in the first embodiment.
  • the present invention shall not be deemed limited to the embodiments illustrated but can be varied in all manner of ways evident to one skilled in the art within the scope of the appended claims. It can thus be used for all kinds of continuously moving conveyor belts, or wire scrubs where the belt/ wire/surface may consist of fabric belts, felt, perforated steel sheet, nylon, wire mesh, etc. It could also be used for cleaning rollers, cylinders or other equipment in dusty environments. It is also perfectly possible to use any type of gas instead of air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)

Abstract

L'invention concerne un procédé de nettoyage d'une surface (4, 30, 60) pendant son fonctionnement, cette surface étant en mouvement continu, un dispositif souffleur (1, 41) souffle au moyen d'un gaz sous pression contre la surface et un dispositif d'aspiration (2, 42) aspire presque tout le gaz émis par le dispositif souffleur, ainsi que des particules séparées provenant de la surface après le passage du gaz. Le procédé est caractérisé en ce que le dispositif souffleur souffle du gaz sur une zone dont la largeur constitue seulement une partie de la largeur totale de la surface, traverse dans le sens du mouvement de la surface, et est commandé de manière à souffler le gaz successivement sur un nombre de parties de zones de sorte qu'une zone correspond à toute la largeur de la surface soit nettoyée. L'invention concerne également un dispositif correspondant permettant de mettre en oeuvre le procédé.
PCT/SE2001/001594 2000-07-13 2001-07-09 Procede et dispositif de nettoyage d'une surface pendant son fonctionnement WO2002005976A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001271187A AU2001271187A1 (en) 2000-07-13 2001-07-09 A method and an arrangement for cleaning a surface during operation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0002647A SE0002647L (sv) 2000-07-13 2000-07-13 Förfarande och anordning för rengöring under drift av ett underlag
SE0002647-6 2000-07-13

Publications (1)

Publication Number Publication Date
WO2002005976A1 true WO2002005976A1 (fr) 2002-01-24

Family

ID=20280480

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/001594 WO2002005976A1 (fr) 2000-07-13 2001-07-09 Procede et dispositif de nettoyage d'une surface pendant son fonctionnement

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AU (1) AU2001271187A1 (fr)
SE (1) SE0002647L (fr)
WO (1) WO2002005976A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006102867A1 (fr) * 2005-03-30 2006-10-05 Oezhan Selim Procede pour nettoyer la surface de rouleaux a entrainement rotatif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603775A (en) * 1992-11-25 1997-02-18 Sjoeberg; Staffan Utilization of a suction nozzle and jet nozzle for cleaning moving objects
US5964956A (en) * 1997-06-25 1999-10-12 Voith Sulzer Papiermaschinen Gmbh Process for cleaning a transport belt
DE19822185A1 (de) * 1998-05-16 1999-11-18 Voith Sulzer Papiertech Patent Vorrichtung und Verfahren zum Reinigen eines Transportbandes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603775A (en) * 1992-11-25 1997-02-18 Sjoeberg; Staffan Utilization of a suction nozzle and jet nozzle for cleaning moving objects
US5964956A (en) * 1997-06-25 1999-10-12 Voith Sulzer Papiermaschinen Gmbh Process for cleaning a transport belt
DE19822185A1 (de) * 1998-05-16 1999-11-18 Voith Sulzer Papiertech Patent Vorrichtung und Verfahren zum Reinigen eines Transportbandes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006102867A1 (fr) * 2005-03-30 2006-10-05 Oezhan Selim Procede pour nettoyer la surface de rouleaux a entrainement rotatif

Also Published As

Publication number Publication date
SE0002647L (sv) 2002-01-14
SE0002647D0 (sv) 2000-07-13
AU2001271187A1 (en) 2002-01-30

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