DEDUSTING DEVICE, SANDER AND METHOD FOR DEDUSTING A WORKPIECE

Abstract

A dedusting device, such as for a sander, for dedusting particles from a narrow edge of a workpiece has a nozzle device designed to remove the particles from the edge with a blasting fluid. The nozzle device has at least one nozzle outlet opening through which the blasting fluid emerges for dedusting in a blasting region. An exhaust air device designed to extract by suction the particles removed from the narrow edge of the workpiece (has at least one exhaust air inlet opening through which a blasting fluid containing particles enters. A supporting device which, in the operating state, is used for the workpiece to bear against. The supporting device is arranged between the nozzle device and the exhaust air device.

Claims

1. A dedusting device for dedusting an edge of a workpiece of particles, comprising: a nozzle device designed to remove the particles from the edge of the workpiece with a blasting fluid, wherein the nozzle device has at least one nozzle outlet opening through which the blasting fluid emerges from the nozzle device for dedusting in a blasting region; an exhaust air device designed to extract by suction the particles removed from the edge of the workpiece, wherein the exhaust air device has at least one exhaust air inlet opening through which a composition of the blasting fluid containing particles enters the exhaust air device for dedusting; and a supporting device on which the workpiece to be dedusted bears in the operating state, wherein the supporting device is arranged between the nozzle device and the exhaust air device.

2. The dedusting device according to claim 1, wherein, in an operating state, the exhaust air device is arranged above the supporting device and the nozzle device is arranged beneath the supporting device; or the exhaust air device is arranged beneath the supporting device and the nozzle device is arranged above the supporting device.

3. The dedusting device according to claim 1, wherein the supporting device is designed for fastening and/or conveying the workpiece to be dedusted.

4. The dedusting device according to claim 3, wherein the supporting device has a stationary table unit, and/or has a transport unit designed to transport the workpiece to be processed in a main processing direction, wherein

5. The dedusting device according to claim 4 wherein the transport unit is arranged so as to be movable relative to the table unit.

6. The dedusting device according to claim 4 wherein the transport unit is a transport carpet and/or a transport belt and/or has conveyor rollers for transporting the workpiece.

7. The dedusting device according to claim 1 further an ionizing device for ionizing the blasting fluid.

8. The dedusting device according to claim 1 wherein the blasting fluid is compressed air and/or is an ionized blasting fluid and/or is a mixture of a gas and an inert liquid.

9. The dedusting device according to claim 1 further comprising an ultrasonic device designed to generate an ultrasonic exciter signal to detach the particles from the edge of the workpiece.

10. The dedusting device according to claim 9 wherein the ultrasonic device is designed to generate the ultrasonic exciter signal with a frequency of at least 16 kHz and/or at most 10 GHz.

11. The dedusting device according to claim 9 wherein the ultrasonic device is designed to excite the blasting fluid.

12. The dedusting device according to claim 1 further a workpiece detection device, wherein the workpiece detection device is designed to sense a length and/or width and/or thickness of a workpiece. and/or to sense a position and/or location of the workpiece on the supporting device, and/or to sense a position or location of at least one edge of the workpiece.

13. The dedusting device according to claim 1, wherein the nozzle device has at least one first nozzle unit and/or at least one second nozzle unit, wherein one or more of the at least first nozzle unit extends parallel to a main processing direction, and/or the at least second nozzle unit extends orthogonally to the main processing direction, and/or the at least first and/or second nozzle unit is arrow-shaped, circular, semi-circular and/or half-open, and/or the at least first and/or second nozzle unit is detachable.

14. The dedusting device according to claim 13 wherein the at least first and/or second nozzle unit is arranged so as to be displaceable relative to the supporting device, wherein the at least first and/or second nozzle unit is displaceable depending on a length and/or a width and/or a thickness and/or a position and/or a location of the workpiece sensed by a workpiece detection device, and/or a position and/or a location of the at least one edge of the workpiece as sensed by a workpiece detection device.

15. The dedusting device according to claim 13 wherein the at least one first nozzle unit and/or the at least one second nozzle unit has at least one nozzle element, wherein the at least one nozzle element comprises a single nozzle element or a plurality of nozzle elements, and wherein the at least one nozzle element is comprised of the first and second nozzle unit.

16. The dedusting device according to claim 1 wherein the nozzle device comprises at least one first nozzle unit and/or at least one second nozzle unit, wherein the at least on first nozzle unit and/or the at least one second nozzle unit are arranged such that with respect to the supporting device that the blasting fluid emerges from the at least one nozzle outlet opening substantially perpendicularly to the supporting device, and/or at an angle of between 0° and 90° or 90° and 180° to the supporting device.

17. The dedusting device according to claim 1, wherein the nozzle device comprises: a pressure chamber arranged on the supporting device; and/or a valve device with at least one valve unit which fluidically connects the pressure chamber to at least one first and/or at least one second nozzle unit of the nozzle device.

18. The dedusting device according to claim 1 wherein the supporting device has a bearing channel profile with a plurality of bearing channels, and wherein the nozzle device comprises at least a first nozzle unit and/or at least a second nozzle unit where each of the at least a first nozzle unit and/or the at least a second nozzle element have nozzle elements, and wherein the bearing channel profile of the supporting device is designed such that at least half of the nozzle elements of the at least first nozzle unit and/or the at least a second nozzle unit of the nozzle device are fluidically connected simultaneously to the bearing channels.

19. The dedusting device according to claim 1 further comprising a nozzle control device which is connected in signalling terms to the nozzle device and/or a workpiece detection device, wherein the nozzle control device is designed to operate the nozzle device in pulsed operation and/or constant operation, and/or depending on a sensed length and/or width and/or thickness and/or position of the workpiece to actuate the nozzle device for pulsed operation and/or constant operation for removing the particles from the edge of the workpiece, and/or to actuate the nozzle device such that the at least first nozzle unit and/or the at least second nozzle unit is displaced relative to the supporting device.

20. The dedusting device according to claim 1 further comprising an exhaust air device comprising: a particle charging device designed to electrically charge the particles removed from a blasted edge of the workpiece, wherein the particle charging device electrically charges particles in accordance with a principle of static charging and/or diffusion charging and/or field charging; and/or a vibration exciter device designed to detach the particles removed from the blasted edge of the workpiece and then charged particles.

21. A sander comprising a dedusting device according to claim 1.

22. The sander according to claim 21 further comprising at least one sanding unit for processing the workpiece to be dedusted by the dedusting device.

23. A method for dedusting a workpiece with a dedusting device according to claim 1, comprising: sensing the edge of the workpiece to be dedusted; and blasting the edge with a blasting fluid to remove particles from a sensed edge.

24. The method according to claim 23, wherein the step of sensing the edge of the workpiece to be dedusted comprises the following sub-steps: sensing a length and/or a width and/or a thickness and/or a position of the workpiece, and/or sensing a position and/or a location of the edge of the workpiece. and/or classifying a sensed edge as a front edge and/or rear edge and/or a side edge, and/or classifying the sensed edge as a straight edge and/or a concavely curved edge and/or a convexly curved edge, and/or wherein the step of blasting the sensed edge with the blasting fluid to remove particles from the sensed edge comprises: blasting the sensed edge (with the blasting fluid constantly if the sensed edge has been classified as a side edge, (and/or blasting the sensed edge with the blasting fluid) in a pulsed manner or constantly if the sensed has been classified as a front edge and/or a rear edge, and/or blasting the sensed edge with the blasting fluid in a pulsed manner or constantly if the sensed edge is concave and/or convex and/or straight and/or circular; and/or wherein the method further comprises the following steps: ionizing the blasting fluid, and/or exciting the particle to be removed by absorption of an ultrasonic exciter signal from an ultrasonic device, and/or activating nozzle elements to remove the particles from the edges depending on the sensed length and/or width and/or thickness and/or position of the workpiece; and/or the sensed position and/or location of the sensed narrow edge.

Description

DESCRIPTION OF THE DRAWINGS

[0084] Preferred embodiments of the invention are explained by way of example with reference to the accompanying figures.

[0085] FIG. 1 shows an isometric view of a preferred embodiment of a dedusting device;

[0086] FIG. 2 shows a sectional view of the dedusting device illustrated in FIG. 1;

[0087] FIG. 3 shows an isometric view of a preferred embodiment of a nozzle device as is also provided in the dedusting device illustrated in FIGS. 1 and 2;

[0088] FIG. 4 shows a detail view of the embodiment of the nozzle device illustrated in FIG. 3; and

[0089] FIG. 5 shows a schematic flow diagram of a preferred embodiment of a method for dedusting a workpiece with a dedusting device.

DETAILED DESCRIPTION

[0090] FIG. 1 shows an isometric view of a preferred embodiment of a dedusting device 1 of a sander. The dedusting device 1 is designed to dedust a narrow edge 2a, 2b, 2c, 2d of a workpiece 2 of particles. The dedusting device 1 illustrated in FIG. 1 has a nozzle device 10 (not visible in FIG. 1), an exhaust air device 30 and a supporting device 20.

[0091] The nozzle device 10 is designed to remove the particles from the narrow edge 2a, 2b, 2c, 2d of the workpiece 2 with a blasting fluid 3. To this end, the nozzle device 10 has at least one nozzle outlet opening 11, through which the blasting fluid 3 emerges from the nozzle device 10 for dedusting in a blasting region 140. FIG. 1 shows the dedusting device 1 in an operating state in which the exhaust air device 30 is arranged above the supporting device 20 and the nozzle device 10 is arranged beneath the supporting device 20. In an alternative preferred embodiment of the dedusting device 1, it may be preferred for the exhaust air device 30 to be arranged beneath the supporting device 20 in the operating state and the nozzle device 10 to be arranged above the supporting device 20.

[0092] The exhaust air device 30 is designed to extract by suction the particles removed from the narrow edge 2a, 2b, 2c, 2d of the workpiece 2. To this end, the exhaust air device 30 has at least one exhaust air inlet opening 31 through which a blasting fluid 3 containing particles enters the exhaust air device 30 for dedusting. To separate the particles removed from the narrow edges 2a, 2b, 2c, 2d from the blasting fluid 3 containing particles, it is provided that a particle charging device 60 and a vibration exciter device 70 are arranged within the exhaust air device 30. The particle charging device 60 is designed to electrically charge the particles removed from the blasted narrow edge 2a, 2b, 2c, 2d of the workpiece 2 such that the electrically charged particles stick within the exhaust air device 30. The particle charging device 60 can electrically charge the particles for example in accordance with the principle of static charging, diffusion charging or field charging. The vibration exciter device 70 is designed to accordingly detach the particles removed from the blasted narrow edge 2a, 2b, 2c, 2d of the workpiece 2 and then the charged particles for separation.

[0093] In the operating state, the workpiece 2 to be dedusted rests on the supporting device 20. The supporting device 20 is in this case designed to fasten and convey the workpiece 2 to be dedusted. To this end, the supporting device 20 has a bearing channel profile with a plurality of bearing channels. In this case, the bearing channel profile is designed such that at least half the nozzle elements 14 of the second nozzle unit 13 of the nozzle device 10 are fluidically connected simultaneously to the bearing channels. Furthermore, the supporting device 20 has a stationary table unit 21 and a transport unit 22, which is designed to transport the workpiece 2 to be processed in a main processing direction H. To this end, the transport unit 22 is arranged so as to be movable in the main processing direction H relative to the table unit 21.

[0094] The dedusting device 1 illustrated in FIG. 1 also has an ultrasonic device 40. The ultrasonic device 40 is designed to generate an ultrasonic exciter signal for detaching the particles from the narrow side 2a, 2b, 2c, 2d. By means of the ultrasonic exciter signal, the blasting fluid 3 can be excited with a frequency of 16 kHz up to 10 GHz. This has the effect that the narrow sides 2a, 2b, 2c, 2d can be cleaned better of the particles.

[0095] Furthermore, the dedusting device 1 has a workpiece detection device 50. With the workpiece detection device 50 it is possible to sense for example the length, width and thickness of a workpiece 2. Furthermore, with the workpiece detection device 50 it is possible to sense a position and location of the workpiece 2 on the supporting device 20. In particular, the workpiece detection device 50 is designed to sense at least one narrow side 2a, 2b, 2c, 2d, that is to say the position and location thereof. Preferably, the workpiece detection device 50 is arranged in a region in which the workpiece enters the dedusting device 1, as is illustrated in FIG. 1. Additionally or alternatively, it may be preferred for the workpiece detection device 50 to be arranged in and/or on the exhaust air device 30.

[0096] FIG. 2 shows a sectional view of the dedusting device 1 illustrated in FIG. 1. It is clear from the sectional view that the nozzle device 10 has a second nozzle unit 13, which extends orthogonally to the main processing direction H and is arranged releasably on the table unit 21. It may be preferred for the dedusting device 1 to have a further or a plurality of second nozzle units 13. Additionally or alternatively, it may be preferred for the dedusting device 1 to have at least one first nozzle unit 12, which extends parallel to the main processing direction H. The presently releasably arranged second nozzle unit 13 is not arranged so as to be displaceable relative to the supporting device 20 in the preferred embodiment illustrated in the FIGS. 1 and 2. However, for some embodiments of the dedusting device 1, it may be preferred to provide a displaceably arranged first and/or second nozzle unit 12, 13.

[0097] The second nozzle unit 13 illustrated in FIG. 2 is arranged on the stationary table unit 21 such that the blasting fluid 3 emerges from the at least one nozzle outlet opening 11 substantially perpendicularly to the supporting device 20. However, it may also be preferred to arrange a nozzle device in such a way that the blasting fluid 3 emerges from the at least one nozzle outlet opening 11 at an angle of between 0° and 90° or 90° and 180° to the supporting device 20.

[0098] FIG. 3 shows an isometric view of the nozzle device 10 as is visualized by the sectional view illustrated in FIG. 2. FIG. 4 shows a detail view of the embodiment of the nozzle device 10 that is illustrated in FIG. 3.

[0099] The nozzle unit, schematically illustrated in FIG. 3, of the nozzle device 10 has both a second and an identical first nozzle unit 12, 13. The nozzle unit has a plurality of nozzle elements 14 that are arranged at a distance from one another in a row and are fluidically coupled to a pressure chamber 80. The pressure chamber 80 is fluidically connected at its ends to an ionizing device 100. The ionizing device 100 is designed to ionize the blasting fluid 3. In the presently preferred embodiment, it may be provided that the blasting fluid 3 is provided in the form of compressed air via a connection element 120 such that, in the operating state, the narrow edges 2a, 2b, 2c, 2d are blasted with ionized compressed air for dedusting.

[0100] The embodiment of the dedusting device 1 that is illustrated in FIGS. 1 and 2 may have a nozzle control device (not illustrated) which is connected in signalling terms to the nozzle device 10 and the workpiece detection device 50. By means of the nozzle control device, the nozzle device 10 can be operated in pulsed operation and constant operation. This is possible for example depending on the sensed length, width, thickness and position of the workpiece 2 or depending on the sensed position and location of the narrow edges 2a, 2b, 2c, 2d. The narrow edges classified as side edges 2c, 2d can be blasted with the blasting fluid 3 continuously in constant operation and the front and rear edges 2a, 2b can be blasted with the blasting fluid 3 in a pulsed manner in pulsed operation.

[0101] FIG. 5 shows a schematic flow diagram of a preferred embodiment of a method 1000 for dedusting a workpiece 2 with a dedusting device 1, for example with an above-described dedusting device 1.

[0102] The method firstly comprises sensing 1010 of a narrow edge 2a, 2b, 2c, 2d of a workpiece 2 to be dedusted and blasting 1020 of the sensed narrow edge 2a, 2b, 2c, 2d with a blasting fluid 3 to remove particles from the sensed narrow edge 2a, 2b, 2c, 2d.

[0103] In the presently illustrated preferred embodiment of the method 1000, the step of sensing 1010 a narrow edge 2a, 2b, 2c, 2d of a workpiece 2 to be dedusted comprises a number of sub-steps. In particular, the sensing 1010 of a narrow edge comprises sensing 1010 of a length, a width, a thickness and a position of the workpiece 2 or sensing of a position and/or location of the narrow edge 2a, 2b, 2c, 2d of the workpiece 2. Furthermore, the step of sensing 1010 comprises classifying the sensed narrow edge 2a, 2b, 2c, 2d as a front edge 2a, rear edge 2b and side edge 2c, 2d.

[0104] The step of blasting 1020 the sensed narrow edge 2a, 2b, 2c, 2d with a blasting fluid 3 to remove particles from the sensed narrow edge 2a, 2b, 2c, 2d comprises blasting of the sensed narrow edge 2a, 2b, 2c, 2d with the blasting fluid 3 constantly if the sensed narrow edge 2a, 2b, 2c, 2d has been classified as a side edge 2c, 2d and blasting of the sensed narrow edge 2a, 2b, 2c, 2d with the blasting fluid 3 in a pulsed manner or constantly if the sensed narrow edge 2a, 2b, 2c, 2d has been classified as a front edge 2a or rear edge 2b.

[0105] The method 1000 also comprises ionizing 1030 the blasting fluid 3 and exciting 1040 the blasting fluid 3 with an ultrasonic device 40 for better dedusting of the narrow edges 2a, 2b, 2c, 2d.

[0106] Furthermore, for more efficient and better dedusting of the narrow edges, it is provided to activate 1050 nozzle elements 14 for removing the particles from the narrow edges 2a, 2b, 2c, 2d depending on the sensed length, width, thickness and position of the workpiece 2 or on the sensed position and location of the sensed narrow edge 2a, 2b, 2c, 2d.

LIST OF REFERENCE SIGNS

[0107] 1 Dedusting device

[0108] 2 Workpiece

[0109] 2a, 2b, 2c, 2d Narrow edge

[0110] 3 Blasting fluid

[0111] 10 Nozzle device

[0112] 11 Nozzle outlet opening

[0113] 12, 13 First, second nozzle unit

[0114] 14 Nozzle element

[0115] 20 Supporting device

[0116] 21 Stationary table unit

[0117] 22 Transport unit

[0118] 30 Exhaust air device

[0119] 31 Exhaust air inlet opening

[0120] 40 Ultrasonic device

[0121] 50 Workpiece detection device

[0122] 60 Particle charging device

[0123] 70 Vibration exciter device

[0124] 80 Pressure chamber

[0125] 100 Ionizing device

[0126] 120 Connection element

[0127] 140 Blasting region