Dedusting device, sander and method for dedusting a workpiece

Abstract

The present invention provides a dust removal device (1), particularly a dust removal device (1) for a sand mill, for removing dust from a narrow edge (2a, 2b, 2c, 2d) of a workpiece (2) having particles. The dust removal device (1) comprises: a nozzle device (10) designed to remove particles from the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) by a jet fluid (3); wherein the nozzle device (10) has at least one nozzle outlet opening (11) through which the jet fluid (3) is discharged from the nozzle device (10) for use in a jetting zone (140). Dust removal; and an exhaust gas device (30) designed to extract particles removed from the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) by suction; wherein the exhaust gas device (30) has at least one exhaust gas inlet opening (31) through which a jet fluid (3) containing particles enters the exhaust gas device (30) for dust removal; and a support device (20) on which the workpiece (2) to be dusted is supported in the operating state; characterized in that the support device (20) is disposed between the nozzle device (10) and the exhaust gas device (30).

Description

Technical Field

[0001] This invention relates to a dust removal device for removing dust from the narrow edge of a workpiece containing particles. This invention also relates to a sand mill and a method for removing dust from a workpiece using the dust removal device. Prior Technology

[0002] If a workpiece is to be sprayed or coated with a sheet or film, its surface must meet specific requirements, such as in terms of surface roughness or cleanliness. Otherwise, the paint or coating will not adhere to the workpiece surface at all or will only adhere insufficiently to the surface. In this regard, the required surface conditions need to be met through prior treatment steps.

[0003] However, especially with prior treatment steps such as sanding, it is difficult to achieve the required surface cleanliness. This is because the particles generated during sanding tend to become electrostatically charged and thus adhere to the surface of the workpiece, especially its narrow edges. Sanding particles particularly tend to adhere to the narrow edge area and to the narrow edge itself.

[0004] It is known to use brushes to remove dust from workpieces. However, brushes are not well-suited for removing particles with a size of, for example, less than 100 µm. Furthermore, when using sensitive materials, brushes pose a risk of damaging the workpiece surface.

[0005] This can be avoided by non-contact cleaning of the surface. Various suction extraction devices for non-contact surface cleaning are known from the prior art, such as DE 10 2017 117 715 A1, DE 35 17 677, EP 3 006 162, or CH 674 331. However, the known solutions have significant drawbacks; to completely remove particles, they can only be removed from the surface of the workpiece, especially from its narrow edges, under high energy requirements. In particular, due to the specific instances or configurations of the known suction extraction devices, not all residual dust can be extracted by suction, especially in the narrow edge areas.

[0006] Therefore, the present invention is based on the following objective: to provide a dust removal device, a sand mill, and a method for removing dust from workpieces using the dust removal device without the disadvantages described. Summary of the Invention

[0007] According to one aspect of the present invention, the objective is achieved by a dust removal device, as described in claim 1, for removing dust from the narrow edge of a workpiece containing particles.

[0008] Dust removal devices are particularly suitable for power tools. These power tools are preferably sanders, and more particularly preferably wide-band sanders. In this regard, dust removal devices are especially suitable for removing dust from workpieces that have already been sanded or are intended to be sanded.

[0009] The workpiece typically has one or more straight narrow edges. Furthermore, the workpiece may additionally or alternatively preferably have one or more narrow edges extending in a convex or concave manner. If the workpiece is circular, the narrow edges may extend in a ring shape, particularly around the circle of the workpiece. The narrow edges are particularly the end sides or end faces of the workpiece.

[0010] The workpiece generally always has at least one external narrow edge. Some workpieces may also have one or more internal narrow edges. A workpiece having a cut or notch within at least one external narrow edge generally has at least one internal narrow edge. For example, a cut is a through opening from a first side of the workpiece to a second side opposite the first side. For example, a notch is a groove introduced into the workpiece.

[0011] The dust removal device extends lengthwise in the longitudinal direction and, orthogonal to the longitudinal direction, extends widthwise in the transverse direction. Preferably, the longitudinal direction corresponds to the main processing direction of the power tool in its operating state. The length of the dust removal device in the longitudinal direction preferably corresponds to the length of the processing area of ​​the power tool. The width of the dust removal device in the transverse direction preferably corresponds to the width of the processing area of ​​the power tool.

[0012] The dust removal device has a nozzle assembly designed to remove particles from the narrow edge of the workpiece using jet fluid. The nozzle assembly has at least one nozzle outlet opening through which jet fluid is discharged for dust removal in the spray area. In particular, the nozzle assembly is configured such that the at least one nozzle outlet opening is oriented towards a support device.

[0013] Preferably, when there are a plurality of nozzle outlet openings, the nozzle outlet openings are arranged in a row. Furthermore, it is preferable that when there are a plurality of nozzle outlet openings, the nozzle outlet openings are arranged in a manner that covers an area. In particular, when there are a plurality of nozzle outlet openings, the nozzle outlet openings may form a layer of nozzle outlet openings. Preferably, the nozzle outlet openings are arranged equidistantly from each other. Preferably, the nozzle outlet openings extend across the width of the dust collection device. Additionally, or alternatively, the nozzle outlet openings preferably extend along the length of the dust collection device.

[0014] In particular, it is preferable that the nozzle device with a nozzle outlet opening is configured to be displaced relative to the support device along the length and / or across its width of the dust removal device. Furthermore, it is preferable that the nozzle device with a nozzle outlet opening is configured to pivot relative to the support device, allowing the nozzle device to spray fluid onto the support device or a workpiece positioned on the support device at an angle between 0° and 90° or 90° and 180° in the operating state. The pivotable configuration of the nozzle device with a nozzle outlet opening relative to the support device makes it particularly possible to pivot the spray area around the pivot axis of the nozzle device. This allows for better cleaning of the workpiece, especially its narrow edges, in the operating state.

[0015] In particular, at least one nozzle outlet opening forms an outlet opening plane. Furthermore, preferably, a first group of at least one nozzle outlet opening forms a first outlet opening plane, and a second group of at least one nozzle outlet opening forms a second outlet opening plane different from the first outlet opening plane. In particular, the outlet opening plane is formed in a planar manner. Preferably, the first outlet opening plane is parallel to the second outlet opening plane and extends at a certain distance from the second outlet opening plane.

[0016] Furthermore, the dust removal device includes an exhaust gas device designed to extract particles removed from the narrow edge of the workpiece by suction. The exhaust gas device has at least one exhaust gas inlet opening through which a jet of fluid containing particles enters the device for dust removal. Specifically, the exhaust gas inlet opening is fluidly connected to an exhaust gas passage through which particles removed from the narrow edge of the workpiece can be extracted by suction. In particular, the exhaust gas device is configured such that at least one exhaust gas inlet opening is oriented towards the support device.

[0017] In particular, at least one exhaust gas inlet opening forms an inlet opening plane. Furthermore, preferably, a first group of at least one exhaust gas inlet opening forms a first inlet opening plane, and a second group of at least one exhaust gas inlet opening forms a second inlet opening plane different from the first inlet opening plane. In particular, the inlet opening plane is formed in a planar manner. Furthermore, preferably, the first inlet opening plane extends parallel to the second inlet opening plane and is spaced a certain distance from the second inlet opening plane.

[0018] Preferably, the exhaust gas device and nozzle device are configured such that the at least one exhaust gas inlet opening and the at least one nozzle outlet opening are oriented opposite to each other and spaced apart by a certain distance. More preferably, the exhaust gas device and nozzle device are configured such that the at least one exhaust gas inlet opening and the at least one nozzle outlet opening are oriented facing each other.

[0019] In particular, at least one exhaust gas inlet opening is disposed downstream of at least one nozzle outlet opening and at a distance from at least one nozzle outlet opening in the direction of fluid flow. Specifically, the at least one nozzle outlet opening and the at least one exhaust gas inlet opening are configured such that the plane of the outlet opening extends parallel to the plane of the inlet opening. Furthermore, preferably, the plane of the first outlet opening is parallel to the plane of the first inlet opening and extends at a distance from the plane of the first inlet opening. Alternatively, preferably, the plane of the second outlet opening is parallel to the plane of the second inlet opening and extends at a distance from the plane of the second inlet opening.

[0020] Furthermore, in one specific example, it is preferable that the outlet opening plane and the inlet opening plane are configured at an acute angle to each other. Furthermore, it is preferable that the first outlet opening plane and the first inlet opening plane extend at an acute angle. Alternatively, it is preferable that the second outlet opening plane and the second inlet opening plane extend at an acute angle.

[0021] Furthermore, the dust removal device has a support device on which the workpiece to be dusted is supported during operation. To secure the workpiece to the support device during operation, the support device preferably has a suction surface and a suction extraction surface. During operation, the workpiece to be processed and dusted is generally placed flat on the support device. Specifically, during operation, the workpiece to be processed and dusted can be supported on the support device from above or from below. In this case, the narrow edge of the workpiece is particularly its end face. In particular, during operation, the narrow edge extends substantially orthogonally to the support device, and especially orthogonally to the suction surface.

[0022] The support device extends orthogonally to the main processing direction between the suction surface and the extraction surface of the workpiece. Preferably, the suction surface and the extraction surface of the support device extend in a plane. The extraction surface and the suction surface are preferably configured to be spaced apart from each other. In particular, the extraction surface and the suction surface extend parallel to each other.

[0023] The suction surface preferably extends parallel to the plane of the outlet opening. In particular, the suction surface extends parallel to the plane of the first and / or second outlet openings. Furthermore, preferably, the suction surface extends at an acute angle to the plane of the first and / or second outlet openings. The suction surface preferably extends parallel to the plane of the inlet opening. In particular, the suction surface extends parallel to the plane of the first and / or second inlet openings. Furthermore, preferably, the suction surface extends at an acute angle to the plane of the first and / or second inlet openings.

[0024] The suction extraction surface preferably extends parallel to the plane of the outlet opening. In particular, the suction extraction surface extends parallel to the plane of the first and / or second outlet opening. Furthermore, preferably, the suction extraction surface extends at an acute angle to the plane of the first and / or second outlet opening. The suction extraction surface preferably extends parallel to the plane of the inlet opening. In particular, the suction extraction surface extends parallel to the plane of the first and / or second inlet opening. Furthermore, preferably, the suction extraction surface extends at an acute angle to the plane of the first and / or second inlet opening.

[0025] In particular, the dust removal device may have at least one negative pressure chamber, which is formed from the suction and extraction surface of the support device. Specifically, the negative pressure chamber is disposed on the support device. Preferably, the negative pressure chamber is disposed on the suction and extraction surface of the support device. Preferably, the suction and extraction surface of the support device forms the inner wall of the negative pressure chamber.

[0026] At least one negative pressure chamber has a lower pressure compared to the environment of the dust removal device. Ambient pressure can vary depending on the weather. The negative pressure within the negative pressure chamber is preferably generated by a suction device.

[0027] The support device is specified to be positioned between the nozzle device and the exhaust gas device.

[0028] This configuration allows for virtually dust-free delivery of treated workpieces, especially sanded workpieces, for subsequent spraying or coating. In particular, the combination of the positive-pressure jet fluid from the nozzle device and the particle-containing jet fluid extracted under negative pressure using a suction extraction device results in superior cleaning of the dust removal system. Furthermore, narrow edges of the workpiece can be targeted by the nozzle device. The suction extraction device particularly allows for targeted extraction from narrow edges.

[0029] According to a preferred development of the dust removal device, it is specified that, in the operating state, the exhaust gas device is positioned above the support device and the nozzle device is positioned below the support device. Alternatively, it is specified that, in the operating state, the exhaust gas device is positioned below the support device and the nozzle device is positioned above the support device.

[0030] According to another preferred development, the support device is designed for securing and / or conveying the workpiece to be dusted. Preferably, the support device has a fixed table unit. Alternatively or concurrently, the support device has a conveying unit. This is designed to convey the workpiece to be processed in the main processing direction. For this purpose, preferably, the conveying unit is configured to be movable relative to the table unit. Preferably, the conveying unit is in the form of a conveyor layer and / or a conveyor belt, and / or has conveyor rollers for conveying the workpiece.

[0031] In another preferred embodiment, the dust removal device includes an ionization device for ionizing the jet fluid. The ionization device is preferably fluidly connected to a nozzle assembly. Preferably, the ionization device is positioned upstream of the nozzle assembly in the flow direction of the jet fluid. In particular, the ionization device is connected to a jet fluid source, such as a compressed air network or a compressed air source.

[0032] The ionization of the jet fluid allows for the removal of particles adhering to a workpiece, especially those adhering to the narrow edges of the workpiece, and may even be further improved. The jetting of ionized jet fluid onto a workpiece, especially its narrow edges, can further enhance the cleaning effect of dust removal devices.

[0033] Furthermore, according to a preferred embodiment, the jet system is specified as a mixture of compressed air and / or ionized jet fluid and / or gas (especially compressed air) and inert liquid.

[0034] Providing a jet of fluid in the form of compressed air allows for particularly rapid, easy, and cost-effective start-up and operation of the dust removal device. Providing a jet of fluid in the form of a mixture preferably allows for the provision of a jet of fluid suitable for the workpiece material, workpiece geometry, and particle properties.

[0035] Furthermore, a dust removal device with an ultrasonic device is preferably provided. In this case, the ultrasonic device is designed to generate an ultrasonic exciter signal to cause particles to detach from the narrow edge. Preferably, the ultrasonic device is designed to generate an ultrasonic exciter signal with a frequency of at least 16 kHz and / or up to 10 GHz. In particular, the ultrasonic device is preferably designed to excite the jet fluid.

[0036] By using ultrasonic devices, particles adhering to the workpiece, especially those adhering to the narrow edges of the workpiece, can be detached even more effectively. The jet of fluid excited by the ultrasonic exciter signal further improves the cleaning effect of the dust removal device, particularly targeting the narrow edges of the workpiece.

[0037] According to even more specific examples, the dust removal device includes a workpiece detection device. The workpiece detection device is designed to sense the length and / or width and / or thickness of the workpiece. Alternatively or additionally, the workpiece detection device is designed to sense the positioning and / or location of the workpiece on a support device. Furthermore, the workpiece detection device is additionally or additionally designed to sense at least one narrow edge of the workpiece, particularly the positioning and / or location of at least one narrow edge.

[0038] Furthermore, according to one development, the nozzle device is specified to have at least one first nozzle unit and / or at least one second nozzle unit. Each of the at least one first nozzle unit and / or at least one second nozzle unit has at least one nozzle outlet opening. In particular, the at least one first nozzle unit and / or at least one second nozzle unit has a plurality of nozzle outlet openings arranged in a row. Preferably, the nozzle outlet openings are arranged in a row. More preferably, the nozzle outlet openings may also be arranged in two or more rows.

[0039] Preferably, at least the first nozzle unit extends parallel to the main processing direction. Alternatively, at least the second nozzle unit preferably extends orthogonally to the main processing direction.

[0040] Preferably, at least the first and / or second nozzle units are arrow-shaped, circular, semi-circular, and / or semi-open.

[0041] Preferably, at least the first and / or at least the second nozzle unit is detachable, particularly detachably mounted on the support device.

[0042] By means of at least a first and / or a second nozzle unit, the nozzle device can be adapted to the size, geometry, positioning and / or location of the workpiece and / or the number of workpieces to be dusted. Therefore, improved dust removal results can be achieved, especially at narrow edges of the workpiece.

[0043] Furthermore, in a preferred embodiment, at least the first and / or second nozzle units are configured to be displaceable relative to the support device. Preferably, the displacement of at least the first and / or second nozzle units depends on the length and / or width and / or thickness and / or positioning and / or location of the workpiece sensed by the workpiece detection device. Alternatively or additionally, the displacement of at least the first and / or second nozzle units preferably depends on at least one narrow edge of the workpiece sensed by the workpiece detection device, particularly the positioning and / or location of at least one narrow edge of the workpiece.

[0044] In particular, at least the first and / or second nozzle units are configured to be translationally displaceable relative to the support device. Preferably, at least the first and / or second nozzle units are translatably displaceable in the longitudinal and / or transverse directions and orthogonal to the longitudinal and / or transverse directions in the vertical direction. Furthermore, it is preferable that at least the first and / or second nozzle units are configured to be rotatably displaceable relative to the support device. In particular, it is preferable that at least the first and / or second nozzle units are configured to be rotatably displaceable relative to the longitudinal and / or transverse and / or vertical directions. In particular, at least the first and / or second nozzle units are configured to be pivotable relative to the support device. Preferably, at least the first and / or second nozzle units are configured to be pivotable about a pivot axis parallel to the support device, especially the suction surface, and / or about a pivot axis orthogonal to the support device, especially the suction surface.

[0045] With the aid of at least a first and / or second nozzle unit, the nozzle device can be adapted to the size, geometry, positioning, and location of the workpiece, and to the number of workpieces to be dusted. This allows for improved dust removal results, especially at narrow edges of the workpiece.

[0046] Furthermore, according to a preferred development of the dust removal device, at least one first nozzle unit and / or at least one second nozzle unit have at least one nozzle element. Preferably, the nozzle element has a nozzle outlet opening. More preferably, the nozzle element has a plurality of nozzle outlet openings.

[0047] Preferably, the first and second nozzle units include one or more nozzle elements. In particular, at least one first nozzle unit and / or at least one second nozzle unit have a plurality of nozzle elements arranged in a row. Preferably, the nozzle elements are arranged in a row. More preferably, the nozzle elements are also arranged in two or more rows.

[0048] In particular, it is preferable that at least one nozzle element is configured to be displaceable relative to the support device. In particular, at least one nozzle element may be configured to be translationally and / or rotaryly displaced relative to the support device.

[0049] By means of nozzle elements formed and / or configured in this manner, the nozzle device can be adapted to the size, geometry, positioning, and location of the workpiece, as well as the number of workpieces to be dusted. This allows for improved dust removal results, especially at narrow edges of the workpiece.

[0050] According to further development, the nozzle device, in particular at least one first nozzle unit and / or at least one second nozzle unit, is preferably configured relative to the support device in such a way that the jet fluid is discharged substantially perpendicular to the support device from at least one nozzle outlet opening.

[0051] Alternatively, in another preferred development, at least one first nozzle unit and / or at least one second nozzle unit are configured relative to the support device in such a way that the jet fluid is discharged from at least one nozzle outlet opening at an angle between 0° and 90° or between 90° and 180° with respect to the support device.

[0052] Furthermore, according to a preferred embodiment, the nozzle device is specified to have a pressure chamber, which is preferably disposed on a support device, particularly a stage unit. Alternatively or additionally, the nozzle device has a valve device having at least one valve unit that fluidly connects the pressure chamber to at least one first and / or second nozzle unit. In particular, the pressure chamber is fluidly connected to a jet fluid source. Preferably, an ionization device is fluidly disposed between the pressure chamber and the jet fluid source.

[0053] With the aid of this pressure chamber, a relatively large quantity of pressurized jet fluid can be advantageously provided briefly through the nozzle outlet opening for spraying onto the workpiece, especially the narrow-edged one.

[0054] According to another preferred embodiment, the support device, particularly the platform unit and / or the conveying unit, has a support channel profile with a plurality of support channels, wherein the support channel profile is designed such that at least half of the nozzle elements of at least the first and / or at least the second nozzle unit of the nozzle device are simultaneously fluidly connected to the support channel.

[0055] Preferably, the support channel profile is in the form of a hole profile. The hole profile may particularly have a circular cross-section, a polygonal cross-section, and preferably a square or rectangular cross-section. Furthermore, it is preferable that the support channel profile is in the form of a groove profile. Preferably, the channels of the support channel profile are equidistant from each other. Preferably, the channels are at least partially spaced apart from each other at different distances.

[0056] According to another preferred development, the dust removal device has a nozzle control device that is connected to the nozzle assembly and / or workpiece detection device via communication. In particular, the nozzle control device is designed to operate the nozzle assembly in pulsed and / or continuous operation.

[0057] Alternatively or preferably, the nozzle device may be actuated based on the sensed length and / or width and / or thickness and / or positioning of the workpiece, particularly based on the sensed positioning and position of the narrow edge, for pulse operation and / or continuous operation, particularly activating individual nozzle elements to remove particles from the narrow edge of the workpiece, and / or actuating the nozzle device, particularly at least the first and / or second nozzle units, such that they are displaced relative to the support device.

[0058] This allows for the automated operation of dust removal devices, in a particularly favorable manner.

[0059] Finally, in another preferred development, the exhaust gas treatment device is specified to include a particle charging device designed to charge particles removed from the workpiece via the narrow edge of the jet. Preferably, the particle charging device charges the particles based on the principles of electrostatic charging and / or diffusion charging and / or field charging. Therefore, particles extracted by suction can be removed from the jet fluid.

[0060] Alternatively or preferably, the exhaust gas treatment device may include a vibrator designed to detach particles removed from the workpiece by the narrow edge of the jet and subsequently to detach charged particles. With the aid of the vibrator, particles removed from the jet fluid can be separated for disposal.

[0061] According to another version, the objective is achieved by a sand mill as described in claim 16.

[0062] The sand mill is preferably a wide-band sand mill. The sand mill includes a dust collection device. The dust collection device includes individual features or combinations of features of the aforementioned dust collection device, and the advantages and technical effects associated with such features.

[0063] According to a preferred embodiment of a sand mill, it has at least one sand milling unit for processing workpieces.

[0064] According to another embodiment, the objective is achieved by removing dust from the workpiece using a dust removal device as described in claim 18. In particular, the objective is achieved by removing dust from the workpiece using a dust removal device that includes the individual features or combinations of features of the aforementioned dust removal device and the advantages and technical effects associated with those features.

[0065] A method for removing dust from a workpiece using a dust removal device includes the following steps: - Sensing the narrow edge of the workpiece to be dusted; and - The sensed narrow edge is jetted with a jet of fluid to remove particles from the sensed narrow edge.

[0066] According to a preferred embodiment of one of the methods, the step of sensing the narrow edge of the workpiece to be dusted includes the following sub-steps: - Sensing the length and / or width and / or thickness and / or positioning of the workpiece; and / or - Sensing the positioning and / or location of the narrow edge of the workpiece; and / or - Classify the sensed narrow edges as leading and / or trailing and / or lateral edges, particularly as inner and / or outer leading edges and / or inner and / or outer trailing edges and / or inner and / or outer lateral edges; and / or - The sensed narrow edges are classified as straight edges and / or curved edges, especially narrow edges that extend concavely and / or convexly.

[0067] Alternatively or preferably, the step of jetting a fluid onto the sensed narrow edge to remove particles from the sensed narrow edge includes the following sub-steps: - If the sensed narrow edge has been classified as a side edge, especially an inner and / or outer side edge, then the sensed narrow edge is continuously sprayed with jet fluid; and / or - If the sensed narrow edge has been classified as a leading edge and / or a trailing edge, especially an inner and / or outer leading edge and / or an inner and / or outer trailing edge, then the sensed narrow edge is sprayed with jet fluid in a pulsed or continuous manner; and / or - If the sensed narrow edge is concave and / or convex and / or straight and / or circular, then the sensed narrow edge is sprayed with jet fluid in a pulsed manner or continuously.

[0068] Preferably, or alternatively, the method also includes the following steps: - Ionized jet fluid; and / or - By absorbing the signal from the ultrasonic exciter of the ultrasonic device to excite the particles to be removed; and / or - Activate the nozzle element to remove particles from the narrow edge, which depends on ○ The sensed length and / or width and / or thickness and / or positioning of the workpiece; and / or ○ The sensed location and / or position of the narrow edge.

[0069] It should be understood that a dust removal device according to one aspect of the present invention and a sand mill and a method for dust removal of workpieces using the dust removal device according to other aspects of the present invention have the same and similar aspects and advantages, especially as set forth in the appended claims. For this purpose, reference is made throughout the above description.

[0070] Specific examples of the invention are described below with reference to the accompanying drawings. These illustrative examples are not necessarily to scale; rather, the drawings intended for explanation are provided in a schematic and / or slightly distorted form. For additions of teachings immediately apparent from the drawings, refer to the relevant prior art. It should be considered here that many modifications and alterations related to the form and detail of the specific examples may be made without departing from the general concept of the invention. The features of the invention disclosed in this specification, drawings, and claims, and any combination thereof, may be essential to the development of the invention. Furthermore, all combinations of at least two of the features disclosed in this specification, drawings, and / or claims are within the scope of the invention. The general concept of the invention is not limited to the exact form or detail of the preferred examples shown and described below, nor is it limited to the subject matter that would be constrained compared to the subject matter claimed in the claims. For simplicity, in the following text, the same reference numerals are used for the same or similar parts or parts having the same or similar function. Simple Explanation of the Diagram

[0071] Preferred embodiments of the invention are explained by way of example with reference to the accompanying drawings. [Figure 1] An isometric view showing a preferred embodiment of the dust removal device; [Figure 2] shows a cross-sectional view of the dust removal device illustrated in Figure 1; [Figure 3] shows an isometric view of a preferred embodiment of the nozzle device also described in Figures 1 and 2; [Figure 4] shows a detailed view of a specific example of the nozzle device illustrated in Figure 3; and [Figure 5] A schematic flowchart illustrating a preferred specific example of a method for removing dust from a workpiece using a dust removal device. Implementation

[0072] Figure 1 shows an isometric view of a preferred embodiment of the dust removal device 1 for a sand mill. The dust removal device 1 is designed to remove dust from the narrow edges 2a, 2b, 2c, and 2d of the workpiece 2 containing particles. The dust removal device 1 illustrated in Figure 1 includes a nozzle device 10 (not visible in Figure 1), an exhaust gas device 30, and a support device 20.

[0073] The nozzle device 10 is designed to remove particles from the narrow edges 2a, 2b, 2c, and 2d of the workpiece 2 using jet fluid 3. For this purpose, the nozzle device 10 has at least one nozzle outlet opening 11 through which jet fluid 3 is discharged from the nozzle device 10 to perform dust removal in the spray area 140. Figure 1 shows the dust removal device 1 in operation, wherein the exhaust gas device 30 is disposed above the support device 20 and the nozzle device 10 is disposed below the support device 20. In a preferred alternative embodiment of the dust removal device 1, it is preferable that the exhaust gas device 30 is disposed below the support device 20 and the nozzle device 10 is disposed above the support device 20 in operation.

[0074] The exhaust gas device 30 is designed to extract particles removed from the narrow edges 2a, 2b, 2c, and 2d of the workpiece 2 by suction. For this purpose, the exhaust gas device 30 has at least one exhaust gas inlet opening 31 through which the particle-containing jet fluid 3 enters the exhaust gas device 30 for dust removal. To separate the particles removed from the narrow edges 2a, 2b, 2c, and 2d from the particle-containing jet fluid 3, a particle charging device 60 and a vibrator device 70 are disposed within the exhaust gas device 30. The particle charging device 60 is designed to charge the particles removed from the workpiece 2 by the jetting narrow edges 2a, 2b, 2c, and 2d, causing the charged particles to adhere within the exhaust gas device 30. The particle charging device 60 can charge the particles, for example, based on the principles of electrostatic charging, diffusion charging, or field charging. The vibrator device 70 is designed to accordingly detach particles removed from the workpiece 2 by the sprayed narrow edges 2a, 2b, 2c, 2d and subsequently detach charged particles for separation.

[0075] In operation, the workpiece 2 to be dusted is placed on the support device 20. The support device 20 is designed to secure and transport the workpiece 2. For this purpose, the support device 20 has a support channel profile with a plurality of support channels. In this case, the support channel profile is designed such that at least half of the nozzle element 14 of the second nozzle unit 13 of the nozzle device 10 is simultaneously fluidly connected to the support channel. Furthermore, the support device 20 has a stationary unit 21 and a conveying unit 22, which is designed to convey the workpiece 2 to be processed in the main processing direction H. For this purpose, the conveying unit 22 is configured to be movable relative to the stationary unit 21 in the main processing direction H.

[0076] The dust removal device 1 illustrated in Figure 1 also includes an ultrasonic device 40. The ultrasonic device 40 is designed to generate an ultrasonic exciter signal to dislodge particles from the narrow sides 2a, 2b, 2c, and 2d. With the aid of the ultrasonic exciter signal, the jet fluid 3 can be excited at frequencies from 16 kHz to 10 GHz. This has the effect of better cleaning particles from the narrow sides 2a, 2b, 2c, and 2d.

[0077] Furthermore, the dust removal device 1 includes a workpiece detection device 50. The workpiece detection device 50 can sense, for example, the length, width, and thickness of the workpiece 2. Additionally, the workpiece detection device 50 can sense the positioning and location of the workpiece 2 on the support device 20. In particular, the workpiece detection device 50 is designed to sense at least one narrow side 2a, 2b, 2c, 2d, i.e., its positioning and location. Preferably, the workpiece detection device 50 is disposed within the area where the workpiece enters the dust removal device 1, as illustrated in FIG1. ​​Alternatively or alternatively, it is preferable that the workpiece detection device 50 is disposed in and / or on the exhaust gas device 30.

[0078] Figure 2 shows a cross-sectional view of the dust removal device 1 illustrated in Figure 1. As can be clearly seen from the cross-sectional view, the nozzle device 10 has a second nozzle unit 13 extending orthogonally to the main processing direction H and detachably mounted on the platform unit 21. Preferably, the dust removal device 1 has one or more second nozzle units 13. Alternatively, it is preferable that the dust removal device 1 has at least one first nozzle unit 12 extending parallel to the main processing direction H. In the preferred embodiment illustrated in Figures 1 and 2, the currently detachably configured second nozzle unit 13 is not configured to be displaceable relative to the support device 20. However, for some embodiments of the dust removal device 1, it is preferable to provide a first nozzle unit 12 and / or a second nozzle unit 13 configured in a displaceable manner.

[0079] The second nozzle unit 13 illustrated in Figure 2 is disposed on the fixed platform unit 21 such that the jet fluid 3 is discharged substantially perpendicular to the support device 20 from at least one nozzle outlet opening 11. However, it is also preferable to configure the nozzle device in such a way that the jet fluid 3 is discharged from at least one nozzle outlet opening 11 at an angle between 0° and 90° or between 90° and 180° with respect to the support device 20.

[0080] Figure 3 shows an isometric view of the nozzle device 10 as seen in the cross-sectional view illustrated in Figure 2. Figure 4 shows a detailed view of a specific example of the nozzle device 10 illustrated in Figure 3.

[0081] The nozzle unit of the nozzle device 10 schematically illustrated in Figure 3 has both a second nozzle unit 13 and an identical first nozzle unit 12. The nozzle unit has a plurality of nozzle elements 14 arranged in a row at a certain distance from each other and fluidly coupled to a pressure chamber 80. The pressure chamber 80 is fluidly connected at its end to an ionization device 100. The ionization device 100 is designed to ionize the jet fluid 3. In a presently preferred embodiment, the jet fluid 3 may be provided in the form of compressed air via a connecting element 120, such that, in operation, the narrow edges 2a, 2b, 2c, and 2d are jetted with ionized compressed air for dust removal.

[0082] A specific example of the dust removal device 1 illustrated in Figures 1 and 2 may have a nozzle control device (not shown) connected to the nozzle device 10 and the workpiece detection device 50 via communication. The nozzle control device allows the nozzle device 10 to be operated in both pulsed and continuous operation. For example, this may depend on the sensed length, width, thickness, and positioning of the workpiece 2, or on the sensed positioning and location of the narrow edges 2a, 2b, 2c, and 2d. The narrow edges classified as side edges 2c and 2d can be continuously sprayed with jet fluid 3 in continuous operation, while the leading edge 2a and trailing edge 2b can be sprayed with jet fluid 3 in a pulsed manner in pulsed operation.

[0083] Figure 5 shows a schematic flowchart of a preferred embodiment of a method 1000 for removing dust from a workpiece 2 using, for example, the dust removal device 1 described above.

[0084] The method first includes sensing 1010 of the narrow edges 2a, 2b, 2c, and 2d of the workpiece 2 to be dusted, and spraying 1020 of the sensed narrow edges 2a, 2b, 2c, and 2d with jet fluid 3 to remove particles from the sensed narrow edges 2a, 2b, 2c, and 2d.

[0085] In the preferred embodiment of method 1000 as currently described, the step of sensing 1010 the narrow edges 2a, 2b, 2c, 2d of the workpiece 2 to be dusted includes multiple sub-steps. In particular, the sensing of the narrow edges 1010 includes sensing the length, width, thickness, and positioning of the workpiece 2, or sensing the positioning and / or location of the narrow edges 2a, 2b, 2c, 2d of the workpiece 2. Furthermore, the sensing step 1010 includes classifying the sensed narrow edges 2a, 2b, 2c, 2d into leading edge 2a, trailing edge 2b, and side edges 2c, 2d.

[0086] The step of removing particles from the sensed narrow edges 2a, 2b, 2c, 2d by spraying the jet fluid 3 onto the sensed narrow edges 2a, 2b, 2c, 2d includes: if the sensed narrow edges 2a, 2b, 2c, 2d have been classified as side edges 2c, 2d, then the jet fluid 3 is continuously sprayed onto the sensed narrow edges 2a, 2b, 2c, 2d; and if the sensed narrow edges 2a, 2b, 2c, 2d have been classified as leading edge 2a or trailing edge 2b, then the jet fluid 3 is sprayed onto the sensed narrow edges 2a, 2b, 2c, 2d in a pulsed manner or continuously.

[0087] Method 1000 also includes ionizing the jet fluid 3 1030 and exciting the jet fluid 3 1040 with an ultrasonic device 40 to better remove dust from the narrow edges 2a, 2b, 2c, and 2d.

[0088] In addition, in order to remove dust from the narrow edges more efficiently and better, the 1050 nozzle element 14 is activated to remove particles from the narrow edges 2a, 2b, 2c, 2d, depending on the sensed length, width, thickness and positioning of the workpiece 2 or the sensed positioning and position of the narrow edges 2a, 2b, 2c, 2d.

[0089] 1: Dust removal device 2: Workpiece 2a, 2b, 2c, 2d: Narrow edge 3: Jet fluid 10: Nozzle device 11: Nozzle outlet opening 12: First Nozzle Unit 13: Second Nozzle Unit 14: Nozzle element 20: Support device 21: Fixed platform unit 22: Transmission Unit 30: Exhaust gas treatment device 31: Exhaust gas inlet opening 40: Ultrasonic device 50: Workpiece detection device 60: Particle charging device 70: Vibrator device 80: Pressure chamber 100: Ionization device 120: Connecting element 140: Spraying area

Claims

1. A dust removal device (1), particularly a dust removal device (1) for a sand mill, for removing dust from a narrow edge (2a, 2b, 2c, 2d) of a workpiece (2) having particles, the dust removal device (1) comprising: - a nozzle device (10) designed to remove particles from the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) by a jet fluid (3); wherein the nozzle device (10) has at least one nozzle outlet opening (11) through which the jet fluid (3) is discharged from the nozzle device (10) for dust removal in a jetting zone (140); and - A venting device (30) designed to extract particles removed from the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) by suction; wherein the venting device (30) has at least one venting inlet opening (31) through which a jet fluid (3) containing particles enters the venting device (30) for dust removal; and a support device (20) on which the workpiece (2) to be dusted is supported in the operating state; wherein the support device (20) is disposed between the nozzle device (10) and the venting device (30); and a workpiece detection device (50) wherein the workpiece detection device (50) is designed to sense at least one narrow edge (2a, 2b, 2c, 2d) of the workpiece (2).

2. As in request item 1, the dust removal device (1), wherein, In this operating state, - the exhaust gas device (30) is positioned above the support device (20) and the nozzle device (10) is positioned below the support device (20); or - the exhaust gas device (30) is positioned below the support device (20) and the nozzle device (10) is positioned above the support device (20).

3. The dust removal device (1) of claim 1 or 2, wherein the support device (20) is designed for securing and / or conveying the workpiece (2) to be dusted, wherein the support device (20) preferably: - has a fixed platform unit (21), and / or - has a conveying unit (22) designed for conveying the workpiece (2) to be processed in a main processing direction (H), wherein - preferably, the conveying unit (22) is configured to be movable relative to the platform unit (21), and / or - preferably, the conveying unit (22) is in the form of a conveying layer and / or a conveyor belt, and / or has conveyor rollers for conveying the workpiece (2).

4. The dust removal device (1) of claim 1 or 2, having an ionization device (100) for ionizing the jet fluid (3).

5. The dust removal device (1) of claim 1 or 2, wherein the jet fluid (3) is compressed air and / or an ionized jet fluid (3) and / or a mixture of a gas, particularly compressed air, and an inert liquid.

6. The dust removal device (1) of claim 1 or 2, having an ultrasonic device (40) designed to generate an ultrasonic exciter signal to cause particles to detach from the narrow edge (2a, 2b, 2c, 2d), wherein preferably, the ultrasonic device (40) is designed to generate the ultrasonic exciter signal having a frequency of at least 16 kHz and / or at most 10 GHz, wherein particularly preferably, the ultrasonic device (40) is designed to excite the jet fluid (3).

7. The dust removal device (1) of claim 3, wherein the workpiece detection device (50) is designed to: - sense a length and / or width and / or thickness of a workpiece (2); and / or - sense a position and / or location of the workpiece (2) on the support device (20); and / or - sense a position and / or location of the at least one narrow edge (2a, 2b, 2c, 2d).

8. The dust removal device (1) as requested in item 7, wherein, The nozzle device (10) has at least one first nozzle unit (12) and / or at least one second nozzle unit (13), wherein preferably, the at least first nozzle unit (12) extends parallel to the main processing direction (H), and / or preferably, the at least second nozzle unit (13) extends orthogonally to the main processing direction (H); and / or preferably, the at least first and / or second nozzle units (12, 13) are arrow-shaped, circular, semi-circular and / or semi-open; and / or preferably, the at least first and / or second nozzle units (12, 13) are detachable, and in particular detachably disposed on the support device (20).

9. The dust removal device (1) as requested in item 8, wherein, The at least first and / or second nozzle units (12, 13) are configured to be displaceable relative to the support device (20), wherein preferably, the at least first and / or second nozzle units (12, 13) may be displaced depending on: - the length and / or width and / or thickness and / or positioning and / or location of the workpiece (2) sensed by the workpiece detection device (50); and / or - at least one narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) sensed by the workpiece detection device (50), in particular the positioning and / or location of the at least one narrow edge (2a, 2b, 2c, 2d) of the workpiece (2).

10. The dust removal device (1) of claim 8, wherein the at least one first nozzle unit (12) and / or the at least one second nozzle unit (13) has at least one nozzle element (14), wherein preferably, the first and second nozzle units (12, 13) include one or more of the at least one nozzle element (14).

11. The dust removal device (1) of claim 8, wherein the nozzle device (10), in particular the at least one first nozzle unit and / or the at least one second nozzle unit (12, 13) is configured relative to the support device (20) such that the jet fluid (3) is discharged from the at least one nozzle outlet opening (11) in such a way as: - substantially perpendicular to the support device (20); and / or - at an angle between 0° and 90° or 90° and 180° with respect to the support device (20).

12. The dust removal device (1) of claim 8, wherein the nozzle device (10) has: - a pressure chamber (80) preferably disposed on the support device (20), in particular on the platform unit (21); and / or - a valve device having at least one valve unit that fluidly connects the pressure chamber (80) to the at least one first and / or second nozzle unit (12, 13).

13. The dust removal device (1) of claim 10, wherein the support device (20) has a support channel profile having one of a plurality of support channels, wherein the support channel profile is designed such that at least half of the nozzle elements (14) of the at least first nozzle unit and / or the at least second nozzle unit (12, 13) of the nozzle device (10) are simultaneously fluidly connected to the support channels.

14. The dust removal device (1) of claim 10, having a nozzle control device connected by means of communication to the nozzle device (10) and / or the workpiece detection device (50), wherein the nozzle control device is specifically designed to: - operate the nozzle device (10) in pulse operation and / or continuous operation; and / or, - depending on the sensed length and / or width and / or thickness and / or positioning of the workpiece (2), especially depending on the sensed positioning and location of the sensed narrow edge (2a, 2b, 2c, 2d), ○ actuate the nozzle device (10) for pulse operation and / or continuous operation, especially activating individual nozzle elements (14) to remove particles from the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2); and / or ○ actuate the nozzle device (10), especially the at least first and / or second nozzle units (12, 13), such that they are displaced relative to the support device (20).

15. The dust removal device (1) of claim 1 or 2, the exhaust gas device (30) has: - a particle charging device (60) designed to charge particles removed from the workpiece (2) by the sprayed narrow edge (2a, 2b, 2c, 2d), wherein preferably, the particle charging device (60) charges the particles according to the principles of electrostatic charging and / or diffusion charging and / or field charging; and / or - a vibrator device (70) designed to disengage the particles removed from the workpiece (2) by the sprayed narrow edge (2a, 2b, 2c, 2d) and subsequently disengage the charged particles.

16. A sand mill, particularly a wide-band sand mill, comprising a dust removal device (1) as claimed in any one of claims 1 to 15.

17. The sand mill of claim 16, having at least one sand milling unit for processing one of the workpieces (2) to be dusted by means of the dust removal device (1).

18. A method (1000) for dusting a workpiece (2) with a dust removal device (1), particularly a dust removal device (1) as claimed in any one of claims 1 to 15, the method (1000) comprising the steps of: - sensing (1010) a narrow edge (2a, 2b, 2c, 2d) of the workpiece (2) to be dusted; and - spraying (1020) a jet fluid (3) onto the sensed narrow edge (2a, 2b, 2c, 2d) to remove particles from the sensed narrow edge (2a, 2b, 2c, 2d).

19. The method (1000) of claim 18, wherein the step of sensing (1010) a narrow edge (2a, 2b, 2c, 2d) of a workpiece (2) to be dusted comprises the following sub-steps: ○ Sensing a length, a width, a thickness, or a position of the workpiece (2); ○ Sensing a position or location of the narrow edge (2a, 2b, 2c, 2d) of the workpiece (2); ○ Classifying the sensed narrow edge (2a, 2b, 2c, 2d) as a leading edge (2a) or a trailing edge (2b) or a side edge (2c, 2d), particularly as an inner or outer leading edge, an inner or outer trailing edge, or an inner or outer side edge; ○ Classifying the sensed narrow edge (2a, 2b, 2c, 2d) as a straight edge or a curved edge, particularly as a concave or convex narrow edge (2a, 2b, 2c, 2d); The step of removing particles from the sensed narrow edges (2a, 2b, 2c, 2d) by spraying (1020) a jet fluid (3) onto the sensed narrow edges (2a, 2b, 2c, 2d) includes: ○ If the sensed narrow edges (2a, 2b, 2c, 2d) are classified as a side edge (2c, 2d), especially as an inner or outer side edge, then the jet fluid (3) is continuously sprayed onto the sensed narrow edges (2a, 2b, 2c, 2d); ○ If the sensed narrow edges (2a, 2b, 2c, 2d) are classified as a leading edge (2a) or a trailing edge (2b), especially as an inner or outer leading edge or an inner or outer trailing edge, then the jet fluid (3) is sprayed onto the sensed narrow edges (2a, 2b, 2c, 2d) in a pulsed manner or continuously; ○ If the sensed narrow edge (2a, 2b, 2c, 2d) is concave or convex or straight or circular, the jet fluid (3) is jetted onto the sensed narrow edge (2a, 2b, 2c, 2d) in a pulsed manner or continuously; - Preferably, the method (1000) also includes the following steps: ○ Ionizing (1030) the jet fluid (3); ○ Exciting (1040) the particles to be removed by absorbing an ultrasonic exciter signal from an ultrasonic device (40); ○ Activating (1050) the nozzle element (14) to remove particles from the narrow edges (2a, 2b, 2c, 2d), which depends on ▪ the sensed length or width or thickness or positioning of the workpiece; ▪ the sensed positioning or location of the sensed narrow edge (2a, 2b, 2c, 2d).

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