CN117642255A - Blowing method for cleaning abrasive belt by using air knife - Google Patents
Blowing method for cleaning abrasive belt by using air knife Download PDFInfo
- Publication number
- CN117642255A CN117642255A CN202180099826.6A CN202180099826A CN117642255A CN 117642255 A CN117642255 A CN 117642255A CN 202180099826 A CN202180099826 A CN 202180099826A CN 117642255 A CN117642255 A CN 117642255A
- Authority
- CN
- China
- Prior art keywords
- air
- air knife
- dust
- sanding
- knife
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004140 cleaning Methods 0.000 title claims abstract description 6
- 238000007664 blowing Methods 0.000 title claims description 9
- 239000000428 dust Substances 0.000 claims description 16
- 239000003570 air Substances 0.000 description 50
- 239000007789 gas Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention describes a method for cleaning abrasive belts by means of a full-width air knife or several segmented air knives and a device for enclosing the air knife or knives by means of an air hood (8) for guiding the dust-laden air stream to exit. If the apparatus is used in a belt sander equipped with a vacuum fixed workpiece conveyor, the air supply can be optimized by using a diverter to reduce the fan requirement.
Description
Technical Field
The invention relates to the technical field of abrasive belt sanding.
Background
The prior art is a device for blowing off sanding dust on workpieces and sand belts on belt sanders. The latter dust is blown off through a shaft with holes or grooves, i.e. a nozzle acting on the full width of the sanding belt, or by a rotatable star nozzle which is blown off by a gas flow in a continuous, intermittent or pulsating manner during sanding. In particular for the first solution, the demand for compressed air is high and therefore the costs are correspondingly high. For the second mentioned device, the technical effort likewise involves considerable additional costs. The two devices used so far have the disadvantage that even though they are only limited, selectively acting due to their mainly pendulum motion, the uneven cleaning of the sanding belt leaves a correspondingly pronounced and uneven sanding pattern on the fine workpiece surface.
Disclosure of Invention
The invention solves the problem of generating an air flow acting on the sanding belt by a technically simple, energy-saving and cost-effective process and describes the device needed for this. In this process, it is used for the first time with a device known from other fields of application, the so-called air knife (also called air knife). Such devices are commonly used to separate air masses (e.g., air curtains into a doorway), dry surfaces, or clean work pieces or other objects.
The air knife is characterized in that by reducing the cross section of the container to a gap of a few mm slot width, the amount of air introduced by the fan and the air inlet pipe is reduced, from which a continuous air flow is led out and directed towards the sanding belt. The invention also includes the use of such air knives in a series extension upstream and downstream of the process flow, which describes the air supply and removal solution. Compared with the device which is most commonly used at present and uses a perforated air pipe, the invention not only can improve the dust removal effect of the abrasive belt in quality (because the dust removal is more uniform), but also has economic advantages. The former uses compressed air, so the efficiency can only reach about fifty percent because of the possible increase in energy demand required to generate high pressure, while the air knife is nearly one hundred percent efficient due to its linear energy demand plus the additional greater air flow.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
figure 1 shows an air knife according to the invention acting on an abrasive belt (7) with an air supply tube (1), an exhaust gap (2), an air flow (3) emerging from it, an optional air connection tube (4) and an air chamber (5) with an internal deflector (6);
FIG. 2 shows the same air knife and its exhaust gap (2), air supply tube (1) and ejected air flow (3) and air chamber (5) of the invention, with the aid of an air extraction hood (8) and exhaust tube (9) for delivering the air flow containing sanding dust;
FIG. 3 shows a section of the apparatus, jet stream (3) and exhaust stream (16) of FIG. 2 of the present invention;
fig. 4 shows a belt sander according to the invention with a workpiece vacuum holding device (10) with conveyor belt and table perforations for holding workpieces (15), through which the air flow supply (11) is carried out, so that only one fan (12) and one flow divider (13) with a servo motor (14) are required for the installation in order to optimize the air flow supply of the air supply pipe (1).
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The object of the invention is an air knife for cleaning an abrasive belt (7) during sanding, as described in the opening paragraph. In view of the requirement that air containing sanding dust is not allowed to escape into the machine (and thus contaminate the machine), which is not met by existing apparatus for blowing off sanding dust, this arrangement is characterized by also comprising one or more air chambers surrounding the air knives and openings through which contaminated air is drawn to a suction system for filtering dust, for example an apparatus using a suction hood (8). In order to achieve a velocity of the gas stream (3) of about 25-40 m/s, the gap width of the exhaust gap (2) is typically 1-5 mm, and the back flow opening for contaminated air is several times wider. Furthermore, the air chamber (5) may be equipped with a deflector (6) with a suitable function to achieve a uniform and continuous jet of air flow (3). The desired airflow supply is taken from the room air by a fan. If the belt sander is provided with a workpiece vacuum conveyor (10) for holding a workpiece (15), a supply of air flow can be obtained thereby, so that the use of additional fans can be dispensed with. In this case, ambient air enters the air knife through perforations in the feed table and conveyor belt.
However, this is not hindered only when the perforations remain clear (i.e., not for the actual purpose of securing the workpiece). If the perforations are covered by the workpiece, the reduced supply of air must be compensated for in other ways. The reduction in the amount of supply air is detected by the formation of a vacuum unless the control system has detected and compensated for when loading the workpiece. In both cases, the compensation is effected by means of a spoiler or a diverter valve (13), for example by providing the indoor air intake line with a servomotor (14).
The device can in principle be used not only for air but also for various gases and can be retrofitted or expanded as desired. For example, it is combined with an ionization unit that eliminates sanding dust charges.
The device can be optimized by sectioning it into several air knives over the whole width of the sanding belt, but these air knives are only used for the area where sanding dust is generated.
The supply of the air knife (or air knives) can be done by means of a single or multiple connection pipes (4) through the side and above.
Claims (8)
1. A blowing method for cleaning abrasive belts during sanding, characterized in that the jet of air is generated by an air knife.
2. A method according to claim 1, characterized in that a number of air knives are used, which air knives are arranged in the width direction of the sanding belt and are controlled as desired.
3. An air knife for blowing off abrasive belt dust, characterized in that it comprises one or more openings surrounding it for circulating an air flow inside a sanding machine contaminated by sanding dust.
4. An air knife for blowing off abrasive belt dust, characterized in that the air flow supply is carried out on several sides.
5. An air knife for blowing off abrasive belt dust, characterized in that it draws air from the vacuum fixture of the same sander system.
6. The air knife of claims 3 and 5 wherein the baffle in the air chamber of the air knife optimizes the air flow in the air chamber to be directed evenly.
7. A method characterized in that the air knife according to claim 5 regulates the air flow supply by means of a valve or a flow divider.
8. A method for blowing off dust from a sanding belt, characterized in that the air knife comprises one or more openings around it for circulating air contaminated with dust inside the sanding machine, which air knife draws air from a vacuum fixture.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH00740/21 | 2021-06-25 | ||
| 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 |
|---|---|
| CN117642255A true CN117642255A (en) | 2024-03-01 |
Family
ID=78085966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180099826.6A Pending CN117642255A (en) | 2021-06-25 | 2021-09-28 | Blowing method for cleaning abrasive belt by using air knife |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4359168A1 (en) |
| JP (1) | JP2024522676A (en) |
| CN (1) | CN117642255A (en) |
| WO (1) | WO2022269307A1 (en) |
Family Cites Families (6)
| 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 |
| EP2516738B1 (en) * | 2009-12-22 | 2017-12-20 | Valmet Technologies, Inc. | Air exhaust module, air supply module and method of preventing dust laden air from escaping a localized zone in the dry end of a fiber web 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 |
-
2021
- 2021-09-28 EP EP21789812.1A patent/EP4359168A1/en active Pending
- 2021-09-28 JP JP2023576343A patent/JP2024522676A/en active Pending
- 2021-09-28 CN CN202180099826.6A patent/CN117642255A/en active Pending
- 2021-09-28 WO PCT/IB2021/000609 patent/WO2022269307A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024522676A (en) | 2024-06-21 |
| EP4359168A1 (en) | 2024-05-01 |
| WO2022269307A1 (en) | 2022-12-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |