Particle collection device for collecting particles, filter cleaning unit for such a particle collection device, and machine tool with such a particle collection device

Abstract

The invention relates to a particle collection device (10), in particular a dust box, for a machine tool (12), in particular for an eccentric or orbital sander, with at least one collection unit (14) for collecting particles, which has at least one collection container (16), in particular a collection vessel, with at least one filter unit (18), in particular arranged in the collection container (16), for filtering particles from a fluid flowing through the collection container (16), and with at least one filter cleaning unit (20) arranged on the collection container (16), which has at least one longitudinal axis (22) about which the filter cleaning unit (20) is rotatably mounted relative to the collection container (16) and / or to the filter unit (18), and at least one impulse element (24), in particular an impact projection, which is provided, in particular, for imparting an impulse to the filter unit (18).in particular to transfer to individual pleats of a pleated filter of the filter unit (18), includes. It is proposed that the filter cleaning unit (20) has at least one fluid guiding element (26), in particular a hollow body, preferably a hollow shaft, which extends at least substantially over an entire longitudinal extent of the filter unit (18) and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through an outlet opening (28) from the collection container (16).

Description

State of the art

[0001] A particle collection device for a machine tool has already been proposed, comprising at least one collection unit for collecting particles, which has at least one collection container, at least one filter unit for filtering particles from a fluid flowing through the collection container, and at least one filter cleaning unit arranged on the collection container, which includes at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, as well as at least one impulse element intended to transmit an impulse to the filter unit. Disclosure of the invention

[0002] The invention relates to a particle collection device, in particular a dust box, for a machine tool, in particular for an eccentric or orbital sander, with at least one collection unit for collecting particles, which has at least one collection container, in particular a collection vessel, with at least one filter unit, in particular arranged in the collection container, for filtering particles from a fluid flowing through the collection container, and with at least one filter cleaning unit arranged on the collection container, which has at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, and at least one impulse element, in particular an impact extension, which is provided for transmitting an impulse to the filter unit, in particular to individual pleats of a pleated filter of the filter unit.

[0003] It is proposed that the filter cleaning unit has at least one fluid guiding element, in particular a hollow body, preferably a hollow shaft, which extends at least substantially over the entire longitudinal extent of the filter unit and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through an outlet opening from the collection container.

[0004] The design of the particle collection device according to the invention advantageously enables the efficient discharge of a particle-cleaned fluid. A large filter area of ​​the filter unit can be advantageously achieved because the filter cleaning unit can be arranged in a space-saving manner within the filter unit, while advantageously maintaining fluid flow through the filter unit. Furthermore, the particle-filtered fluid can advantageously be discharged directly on the clean air side of the filter unit with efficient flow. A particularly long service life of the filter unit can be achieved with significant advantage. Moreover, the accumulation of particles, such as grinding dust, on the filter unit can be advantageously prevented. Clogging of the filter unit can also be particularly advantageously prevented. Finally, particularly efficient filtration of particles from a fluid stream can be provided.This can advantageously achieve a particularly high level of user comfort and particularly efficient use of a machine tool.

[0005] The particle collection device is preferably designed to collect particles that are removed from a workpiece by a machining tool mounted on a tool holder of the machine tool. The particles can be, in particular, dust, abrasion, chips, or the like, which are generated by machining a material, for example, wood, metal, plastic, or the like, with the machine tool, especially with a machining tool mounted on a tool holder of the tool holder, such as an abrasive, a cutting disc, a grinding wheel, a grinding belt, a saw blade, a milling cutter, or the like. Preferably, the particle collection device is detachably attachable to the machine tool, in particular to a dust extraction port of the machine tool.Preferably, the particle collection device comprises a connection interface designed for a positive and / or non-positive connection with the machine tool, in particular with the extraction nozzle. "Designed" is understood to mean, in particular, specially configured, specially programmed, specially designed, and / or specially equipped. The fact that an object is designed for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating condition.

[0006] The collection container is preferably designed as a dimensionally stable container, for example, a dust container or a dust box, for collecting particles. The collection container can have a circular cylindrical shape. It is also possible for the collection container to have an ellipsoidal or polygonal shape. Alternatively, it is conceivable that the collection container is designed as a flexible container, for example, a dust bag, a dust sack, or the like. The collection container is preferably made of a plastic, for example, transparent polypropylene or the like. However, it is also conceivable that the collection container is made of a metal or a combination of metal and one or more plastics.Alternatively, the collection container is made of textile, non-woven fabric, fiberglass, quartz fiber, a combination of these, or another material that a professional considers appropriate.

[0007] Preferably, at least one closure element, in particular a closure cap, of the collection unit is arranged on the collection container, which defines at least one outlet opening of the collection container. Furthermore, the collection unit preferably comprises another closure element, in particular another closure cap, which is arranged on a side of the collection unit facing the machine tool when the particle collection device, in particular the collection unit, is installed on the machine tool and defines at least one inlet opening of the collection container. Preferably, the connection interface of the particle collection device is arranged on the further closure element, in particular the further closure cap, and is preferably formed integrally with the closure element. Preferably, the closure element and / or the further closure element can be fastened to the collection container by means of a screw connection.It is also conceivable, however, that the locking element and / or the additional locking element can be attached to the collection container by means of a plug connection or another force-fit and / or form-fit connection that would appear sensible to a person skilled in the art, such as a bayonet connection, a clamp connection, or the like. Preferably, the locking element and the additional locking element have the same form of connection with the collection container. However, it is also conceivable that the locking element and the additional locking element have different forms of connection with the collection container.

[0008] The filter unit is preferably designed to separate particles, impurities, and / or substances from a fluid flow, particularly an air flow. Preferably, the filter unit comprises a filter medium, in particular a filter element, preferably a pleated filter, which is, for example, hollow cylindrical, cylindrical, cuboid, or the like. The filter unit is particularly preferably designed as a pleated filter unit, and more preferably as a lamellar filter unit. The filter element preferably has an annular cross-sectional shape, particularly when viewed in a plane extending perpendicular to the longitudinal axis. Preferably, the outer edges of the pleats of the pleated filter are arranged circularly with respect to the plane perpendicular to the longitudinal axis of the filter unit. Preferably, the filter unit has a support element at at least one axial end to stabilize the pleated filter against deformation.The filter medium can be made of, for example, textiles, paper, nonwovens, fiberglass, a metal mesh, synthetic membranes, a combination of these, or any other material that a specialist considers appropriate.

[0009] The filter cleaning unit is preferably designed to exert a mechanical action on the filter unit, thereby dislodging particles adhering to the filter medium, particularly the pleated filter. Preferably, the filter cleaning unit acts directly on the filter unit, especially the pleated filter. The mechanical action of the filter cleaning unit on the filter unit can be, for example, tapping, striking, brushing, rubbing, or the like. The longitudinal axis of the filter cleaning unit preferably runs parallel to, and in particular coaxially with, the longitudinal axis of the filter unit. Preferably, the longitudinal axis of the filter cleaning unit runs perpendicular to a plane encompassing the outlet opening of the collection container. More preferably, the longitudinal axis runs parallel to a principal plane of the collection container.A "principal extent plane" of an element or component is understood to be, in particular, a plane that is parallel to a major side face of the smallest imaginary cuboid that just completely encloses the element or component, and especially that passes through the center of the cuboid. Preferably, the filter cleaning unit is substantially, and in particular completely, surrounded by the filter unit. It would also be conceivable for the filter cleaning unit to be arranged outside the filter unit. Preferably, the filter cleaning unit is rotatably mounted about its longitudinal axis relative to the filter unit and / or the collection container. It is conceivable that the filter cleaning unit can be rotated manually by a user. It would also be possible for the filter cleaning unit to be rotatable by an additional actuating element, for example, an electric motor.Preferably, the filter cleaning unit strikes the pleats of the pleated filter with the impulse element, particularly in a circumferential direction of the filter unit extending in a plane perpendicular to the longitudinal axis of the filter cleaning unit. Preferably, the impact against the pleats of the pleated filter can also be radial, particularly perpendicular to the longitudinal axis of the filter cleaning unit. It would also be conceivable for the filter cleaning unit to act mechanically on the filter unit in a direction parallel to its longitudinal axis.

[0010] The impulse element is preferably designed as a radial and / or circumferential directional projection. Preferably, the impulse element has a trapezoidal shape, with the base of the trapezoid being located on the fluid guide element. It is also conceivable that the impulse element has a rectangular, triangular, or round shape. Preferably, the maximum length of the base of the impulse element is more than 2.5%, more preferably more than 5%, and most preferably more than 10% of the maximum axial length of the filter unit extending parallel to the longitudinal axis. Alternatively, the maximum axial length of the base of the impulse element can also be less than 2.5% of the maximum axial length of the filter unit extending parallel to the longitudinal axis.In a radial direction, particularly perpendicular to the longitudinal axis, the impulse element preferably extends over a distance of more than 10%, preferably more than 15%, and most preferably more than 20% and less than 50% of a maximum pleat depth into the space between two pleats of the pleated filter. It is also conceivable that the impulse element extends along the radial direction over a distance of less than 10% of the maximum pleat depth into the space between two pleats of the pleated filter. Preferably, the impulse element exhibits elastic bending behavior about an axis parallel to the longitudinal axis of the filter cleaning unit and the filter unit itself. When the filter cleaning unit is rotated, the impulse element is preferably pre-tensioned against a pleat edge of the pleated filter and, upon further rotation of the filter cleaning unit, preferably strikes the next pleat in the direction of rotation of the filter cleaning unit.It would also be conceivable that the impulse element is pre-tensioned at a fold edge of the pleated filter in such a way that it strikes against several fold edges, not just the next fold edge.

[0011] The fluid guide element is preferably designed to discharge the particle-cleaned fluid from the collection container through an outlet opening. The fluid guide element is preferably designed as a hollow shaft, the inner cross-section of which is preferably largely hollow. Alternatively, the fluid guide element can be designed as a solid body with one or more internal channels for discharging the particle-filtered fluid. The internal channels can have a straight or curved profile. Preferably, the fluid guide element is fluidically connected to the outlet opening of the collection container. Preferably, the fluid guide element is surrounded by the filter cleaning unit for at least more than 50% of its total circumference along a circumferential direction of the collection container extending in a plane perpendicular to the longitudinal axis of the filter cleaning unit.Preferably, the fluid guide element is made of a plastic, for example glass fiber reinforced polyamide or the like. However, it would also be conceivable for the fluid guide element to be made of a metal or a combination of materials.

[0012] It is further proposed that the fluid guide element has at least one inlet opening, and in particular several inlet openings, for the fluid into a cavity and / or an inner channel of the fluid guide element, which are arranged in an outer wall of the fluid guide element that runs at least substantially parallel to the longitudinal axis of the filter cleaning unit. Preferably, the inlet openings are circular. Alternatively, it would be conceivable for the inlet openings to have a shape other than circular. The fluid guide element preferably has two inlet openings, which are arranged diametrically opposite each other on the fluid guide element. Furthermore, the fluid guide element can have additional, axially offset inlet openings.Preferably, the two inlet openings of the fluid guide element, which are particularly diametrically opposed to each other, are arranged along a circumferential direction of the fluid guide element extending in a plane perpendicular to its longitudinal axis, offset from each other by an angle of 180°. However, it would also be conceivable for the inlet openings to be arranged along the circumferential direction of the fluid guide element, preferably by an angle of 90°, more preferably by an angle of 60°, or by another angle deemed appropriate by a person skilled in the art. Advantageously, efficient discharge of the particle-filtered fluid can be provided through an internal channel of the fluid guide element. This particularly advantageously reduces flow resistance for the fluid flowing through the particle collection device.

[0013] Furthermore, it is proposed that the impulse element be arranged eccentrically offset to the longitudinal axis of the filter cleaning unit on a fluid guide element, in particular on the fluid guide element. It is conceivable that, in an alternative embodiment, the particle collection device for the solution of the problem according to the invention is designed independently of the fluid guide element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container. Preferably, in the alternative embodiment, the particle collection device, in particular in the embodiment designed independently of the fluid guide element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container, comprisesat least the collection unit for collecting particles, comprising at least the collection container, in particular the collection vessel, with at least the filter unit, in particular arranged in the collection container, for filtering particles from the fluid flowing through the collection container, and with at least the filter cleaning unit arranged on the collection container, which has at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, and at least the impulse element, in particular the striking extension, which is provided for transmitting an impulse to the filter unit, in particular to individual pleats of the pleated filter of the filter unit, wherein the impulse element is eccentrically offset to the longitudinal axis of the filter cleaning unit on a fluid guide element, in particular on the fluid guide element, which may, for example, be designed to be free of internal channels for the discharge of the fluid, in particular the particle-filtered fluid.The impulse element is arranged as follows: Preferably, the impulse element is arranged eccentrically to the longitudinal axis of the fluid guide element by a maximum of the length of the radius of the fluid guide element. More preferably, the impulse element is arranged eccentrically to the longitudinal axis of the fluid guide element by a maximum of 50%, and particularly preferably by a maximum of 20% of the radius of the fluid guide element. Such an arrangement advantageously results in a preferred bending direction of the impulse element and a preferred direction of rotation for actuating the filter cleaning unit. Advantageously, such a design provides a flexible arrangement, since the impulse element can be long and therefore flexible. This particularly advantageously minimizes the risk of damage to the pleated filter. Furthermore, the impulse transmitted by the impulse element to the pleats of the pleated filter can be large.which advantageously enables a high efficiency in cleaning the filter element.

[0014] Furthermore, it is proposed that the fluid guide element has at least one inlet opening, and in particular several inlet openings, for the fluid into a cavity, in particular the one already mentioned, and / or into an inner channel, in particular the one already mentioned, which is arranged in an outer wall of the fluid guide element facing away from the outlet opening and which runs at least substantially parallel to the longitudinal axis of the filter cleaning unit. The area of ​​the fluid guide element facing away from the outlet opening preferably extends from the end of the fluid guide element axially away from the outlet opening towards the outlet opening over a maximum of 40% of a maximum axial length of the fluid guide element extending parallel to the longitudinal axis.Preferably, the area of ​​the fluid guide element facing away from the outlet opening extends from the end of the fluid guide element axially away from the outlet opening towards the outlet opening over a maximum of 30%, and particularly preferably over a maximum of 20%, of the maximum axial length of the fluid guide element extending parallel to the longitudinal axis. Preferably, all inlet openings have a similar design, in particular a circular shape. Alternatively, it is also conceivable that all or some of the inlet openings have a shape other than a circle. Furthermore, with such a design, the fluid flow can be improved in such a way that the entire filter area of ​​the filter unit can be utilized for filtering particles from the fluid stream.

[0015] It is further proposed that the impulse element be arranged on an inner wall of the fluid guide element, in particular one that delimits the inner channel of the fluid guide element, and extend through a fluid guide element recess of the fluid guide element, in particular an outer wall opening of the fluid guide element, which is delimited by an outer wall of the fluid guide element, wherein the impulse element extends over an outer surface of the fluid guide element, preferably along a direction transverse, in particular perpendicular, to the longitudinal axis of the filter cleaning unit. Preferably, the fluid guide element recess, viewed in a plane parallel to the longitudinal axis of the fluid guide element, has an area at least 200% larger than a cross-sectional area of ​​the impulse element lying parallel to the longitudinal axis of the fluid guide element.Particularly preferred is the area of ​​the fluid guide element recess, viewed in the plane parallel to the longitudinal axis of the fluid guide element, being at least 150%, and preferably at least 100%, larger than the cross-sectional area of ​​the impulse element parallel to the longitudinal axis of the fluid guide element. Preferably, the fluid guide element recess has a larger area than the area of ​​the cross-section of the impulse element at a radial position of the impulse element where it extends through the outer wall of the fluid guide element. Preferably, the fluid guide element recess limits bending of the impulse element. Such a design advantageously protects the impulse element from damage caused by excessive bending. Furthermore, particle-filtered fluid can flow into the fluid guide element through the fluid guide element recesses and be efficiently discharged from the collection container.Advantageously, a fluid flow with particularly low flow resistance can be provided.

[0016] Furthermore, it is proposed that the filter cleaning unit comprises at least one further impulse element offset along the longitudinal axis relative to the impulse element, which is arranged on an inner wall of the fluid guide element, in particular the inner channel of the fluid guide element, preferably the aforementioned inner wall, and which extends through a further fluid guide element recess of the fluid guide element, in particular a further fluid guide element outer wall opening, which is limited by the outer wall of the fluid guide element, wherein the further impulse element extends over the outer surface of the fluid guide element, preferably along a direction transverse, in particular perpendicular, to the longitudinal axis of the filter cleaning unit.Preferably, the impulse element and the subsequent impulse element, as well as the respective fluid guide element recess and the respective subsequent fluid guide element recess, are arranged axially along the longitudinal axis at a distance from one another on the fluid guide element. However, it would also be conceivable for the impulse element and the subsequent impulse element to be arranged axially such that the fluid guide element recess for the impulse element and the subsequent fluid guide element recess for the subsequent impulse element are adjacent to one another. Such an arrangement of the impulse element, the fluid guide element recess, the subsequent impulse element, and the subsequent fluid guide element recess can further improve the discharge of the particle-filtered air. Furthermore, it can advantageously improve the cleaning of the filter unit from trapped particles.

[0017] Furthermore, it is proposed that the fluid guide element recess and the further fluid guide element recess be arranged offset from each other in a circumferential direction of the fluid guide element, particularly in the plane extending perpendicular to the longitudinal axis, and especially at an angle of 90° to each other. However, an offset between the fluid guide element recess and the further fluid guide element recess along the circumferential direction at an angle other than 90° would also be conceivable. Such an arrangement of the fluid guide element recess and the further fluid guide element recess advantageously facilitates the discharge of the particle-filtered fluid.

[0018] Furthermore, it is proposed that the filter cleaning unit comprises at least two impulse elements, each arranged on an inner wall of the fluid guide element, particularly the aforementioned inner wall, and each having a principal axis of extension. The principal axes of extension of the impulse elements, particularly in an unloaded state, extend at least substantially parallel to or perpendicular to each other. A "principal axis of extension" of an element or unit is understood to be, in particular, an axis that runs parallel to the longest edge of the smallest geometric cuboid that just completely encloses the element or unit.Preferably, the principal extension direction of the impulse element, originating from the side of the impulse element where it is attached to the inner wall of the fluid guide element, is parallel to the principal extension axis of the impulse element and directed towards the free end of the impulse element. Preferably, the principal extension directions of the two impulse elements are opposite to each other. Preferably, the principal extension directions of the impulse elements extend from the inner wall of the fluid guide element transversely through the fluid guide element and preferably extend through the fluid guide element recess and beyond the outer wall of the fluid guide element. Alternatively, if arranged on the inner wall of the fluid guide element, the fluid guide elements can extend across the outer surface of the fluid guide element without passing through it.The production of the fluid guide element with the impulse elements can be simplified and made more cost-effective. Furthermore, particle-filtered fluid can be discharged more efficiently. An efficient fluid flow can be achieved to greater advantage.

[0019] Furthermore, it is proposed that the impulse element comprises a principal axis of extension, in particular the one already mentioned, which forms an angle other than 90° with an outer surface of the fluid guide element, which in particular runs at least substantially parallel to the longitudinal axis of the filter cleaning unit. Preferably, the principal axis of extension of the impulse element forms an angle of less than 90° with the outer surface of the fluid guide element in an unloaded state. Particularly preferably, the impulse element forms an angle between 45° and 90° with the outer surface of the fluid guide element in an unloaded state. However, it would also be conceivable for the impulse element to form an angle of less than 45° with the outer surface of the fluid guide element in an unloaded state.Such an arrangement advantageously results in a preferred bending direction for the impulse element and a preferred rotation direction for the filter cleaning unit. This design advantageously provides a flexible arrangement, as the impulse element can be long and flexible. This particularly minimizes the risk of damage to the pleated filter. Furthermore, a high impulse can be transmitted from the impulse element to the pleats of the pleated filter, thus advantageously enabling high cleaning efficiency of the filter element.

[0020] Furthermore, it is proposed that the collection unit comprises at least one closure element, in particular the closure cap mentioned above, which limits at least one outlet opening of the collection container, in particular the outlet opening mentioned above, and that the fluid guide element comprises at least one locking element, in particular one, preferably the aforementioned inner channel of the fluid element, for locking with the closure element. It is conceivable that, in an alternative embodiment, the particle collection device for the solution of the problem according to the invention is designed independently of the fluid guide element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container. Preferably, the particle collection device in the alternative embodiment comprises,In particular, in the embodiment independent of the fluid guiding element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular particle-filtered, through the outlet opening from the collection container, at least the collection unit for collecting particles, which has at least the collection container, in particular the collection vessel, with at least the filter unit, in particular arranged in the collection container, for filtering particles from the fluid flowing through the collection container, and with at least the filter cleaning unit arranged on the collection container, which has at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, as well as at least the impulse element, in particular the impact extension, which is provided for imparting an impulse to the filter unit.in particular to transfer to individual pleats of the pleated filter of the filter unit, wherein the collection unit has at least one closure element, in particular the closure cap mentioned above, which limits at least one outlet opening of the collection container, in particular the outlet opening mentioned above, and the fluid guide element has at least one locking element, in particular one, preferably at least partially limiting the inner channel of the fluid element mentioned above, for locking with the closure element. Preferably, the locking element is designed to lock with the closure element and to securely hold the fluid guide element in the collection container and to prevent it from slipping out. The locking element is preferably designed as a spring-loaded locking element. Preferably, the spring-loaded locking element is designed as a rectangular section of the fluid guide element that is free on three sides.which has a main extension direction parallel to the longitudinal axis of the fluid guide element and has a locking lug or locking hook at its free end. Preferably, the locking element and the fluid guide element are formed in one piece. However, it would also be conceivable to provide locking by a spring-loaded locking bolt, a ball locking bolt, a locking pin, or the like. Such a design advantageously provides secure mounting of the filter cleaning unit. Advantageously, such a design minimizes axial play, thereby preventing vibrations during operation. Furthermore, particle-cleaned fluid can advantageously flow into the fluid guide element through the recess between the spring element and the fluid guide element.

[0021] Furthermore, it is proposed that the collection container has an outlet opening with a cross-sectional shape that deviates, in particular from a circular cross-section, preferably having at least one extension defining a slot-like indentation of the outlet opening. This extension is designed to allow the insertion of a fluid guide element, in particular the fluid guide element, together with the impulse element extending over an outer surface of the fluid guide element, into the collection container. It is conceivable that, in an alternative embodiment, the particle collection device for the solution of the problem according to the invention is designed independently of the fluid guide element, which is designed, in particular, as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container. Preferably, the particle collection device in the alternative embodiment comprises:In particular, in the embodiment independent of the fluid guiding element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container, at least the collection unit for collecting particles, which has at least the collection container, in particular the collection vessel, with at least the filter unit, in particular arranged in the collection container, for filtering particles from the fluid flowing through the collection container, and with at least the filter cleaning unit arranged on the collection container, which has at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, as well as at least the impulse element, in particular the impact extension, which is provided for imparting an impulse to the filter unit.The collection container comprises a collection vessel with an outlet opening that has a cross-sectional shape, preferably deviating from a circular cross-section and preferably having at least one extension defining a slot-like indentation of the outlet opening, which is designed to allow the insertion of a fluid guide element, in particular the fluid guide element, together with the impulse element extending over an outer surface of the fluid guide element, into the collection vessel. The outlet opening is preferably designed to allow the fluid guide element, together with the impulse element extending over an outer surface of the fluid guide element, to be inserted into the collection vessel without bending the impulse element. In a preferred embodiment, the outlet opening is located in a closure element of the collection vessel, for example, a closure cap.The fluid guide element is arranged. Preferably, the cross-sectional shape of the outlet opening is designed to provide a key-lock fit with the fluid guide element. Preferably, the extension defining a slot-like indentation of the outlet opening is arranged, in the axial direction, between two adjacent folds of the lamellar filter at the outlet opening. Alternatively, it would be conceivable for the outlet opening to have additional extensions defining further slot-like indentations of the outlet opening or extensions of a different design. This allows the fluid guide element with the impulse element to be inserted into the collection container advantageously easily, for example, without bending the impulse element. Furthermore, the fluid guide element can be inserted into the collection container particularly advantageously in such a way that...that the impulse element is positioned between two adjacent pleats of the lamellar filter. This can advantageously counteract damage to the filter unit during the installation of the fluid guide element.

[0022] Furthermore, it is proposed that the particle collection device has at least one safety unit designed to prevent the connection between the collection container and a closure element, in particular a closure cap, of the collection unit from becoming loose. At least one actuating element of the filter cleaning unit is arranged on the actuating element, which is designed to rotate the impulse element together with a fluid guide element, in particular the fluid guide element, about the longitudinal axis of the filter cleaning unit. It is conceivable that, in an alternative embodiment, the particle collection device, to solve the problem according to the invention, could operate independently of the fluid guide element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for discharging the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container.is designed. Preferably, in the alternative embodiment, particularly in the embodiment independent of the fluid guide element, which is designed in particular as a hollow body, preferably as a hollow shaft, and is provided for the discharge of the fluid, in particular the particle-filtered fluid, through the outlet opening from the collection container, the particle collection device comprises at least the collection unit for collecting particles, which has at least the collection container, in particular the collection vessel, with at least the filter unit, in particular arranged in the collection container, for filtering particles from the fluid flowing through the collection container, and with at least the filter cleaning unit arranged on the collection container, which has at least one longitudinal axis about which the filter cleaning unit is rotatably mounted relative to the collection container and / or to the filter unit, as well as at least the impulse element, in particular the impact extension.The particle collection device, designed to transmit an impulse to the filter unit, in particular to individual pleats of the pleated filter of the filter unit, comprises at least one locking unit designed to prevent the connection between the collection container and a closure element, in particular a closure cap, of the collection unit from becoming loose. At least one actuating element of the filter cleaning unit is arranged on the closure element, and this actuating element is designed to rotate the impulse element together with a fluid guide element, in particular a fluid guide element, about the longitudinal axis of the filter cleaning unit. The locking unit is preferably designed as an axially elastic locking element, for example as a locking stud, which engages with a complementary locking geometry arranged on the closure element. Preferably, the collection container has two locking studs, for example arranged diametrically. It would also be conceivable toThe collection container has more than two locking lugs arranged at one end of the container facing the closure cap. Preferably, the locking lugs are oriented axially towards the closure element. However, it would also be possible for the locking lugs to extend radially, for example, on the outside of the collection container in a direction radially away from its longitudinal axis. It is also conceivable that the locking element is designed as a locking rail, a locking bore, a locking pin, or the like. Such a design advantageously prevents the closure element from accidentally detaching from the collection container. A high level of user comfort can be achieved particularly advantageously.

[0023] Furthermore, the invention relates to a filter cleaning unit for a particle collection device, in particular for the particle collection device according to the invention. This allows the filter unit of the particle collection device to be cleaned advantageously and easily from trapped particles. Advantageously, efficient filtration and a long service life of the filter unit can be provided. Moreover, existing particle collection devices can be retrofitted with the filter cleaning unit according to the invention advantageously, cost-effectively, and with minimal effort. This can advantageously ensure a high degree of sustainability.

[0024] Furthermore, the invention relates to a machine tool, preferably a handheld machine tool, in particular an eccentric or orbital sander, with at least one particle collection device, in particular a particle collection device according to the invention. Preferably, the machine tool is designed as a handheld machine tool. More preferably, the machine tool is designed as an orbital or eccentric sander, in particular a handheld one. It is also conceivable that the machine tool has another configuration that would appear useful to a person skilled in the art, such as a drill, a rotary hammer drill, a saw, a planer, a milling machine, an angle grinder, a garden tool, a multi-function machine tool, or the like. In particular, the machine tool has a blower for removing particles.Preferably, the material removed from a workpiece machined by the machine tool can be dissipated by an airflow, which is generated, for example, by a fan, in particular a fan for cooling the motor of the machine tool. Alternatively, the machine tool may have a pump or extraction unit driven by the machine tool's motor for removing the material. A blower driven by a separate motor, a separately driven pump, or the like would also be conceivable.

[0025] The particle collection device, filter cleaning unit, and / or machine tool according to the invention are not intended to be limited to the application and embodiment described above. In particular, the particle collection device, filter cleaning unit, and / or machine tool according to the invention may, to achieve a functionality described herein, have a different number of individual elements, components, and units than the number specified herein. Furthermore, values ​​within the specified limits of the value ranges stated in this disclosure are also considered disclosed and freely usable. drawing

[0026] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0027] They show: Fig. 1 a machine tool with a particle collection device according to the invention in a schematic representation, Fig. 2 the particle collection device according to the invention in a schematic sectional view with a section plane parallel to a longitudinal axis of a filter unit, Fig. 3 a collection container, a closure element and a filter cleaning unit of the particle collection device according to the invention in a schematic exploded view, Fig. 4 the filter cleaning unit with impulse elements, inlet openings, locking elements and an actuating element for the particle collection device according to the invention in a schematic representation, Fig. 5 a fluid guide element of the filter cleaning unit in a schematic sectional view with a section plane perpendicular to a longitudinal axis of the fluid guide element, Fig. 6 the closure element of the particle collection device according to the invention, with an outlet opening, Fig. 7 a filter unit for the particle collection device according to the invention in a schematic representation, Fig. 8 a support element of the filter unit for the particle collection device according to the invention and Fig. 9 a cross-sectional plane of a support element for a filter unit of the particle collection device according to the invention, lying parallel to a longitudinal axis of a filter unit. Description of the exemplary embodiment

[0028] Fig. Figure 1 shows a machine tool 12 with a particle collection device 10. The machine tool 12 is designed as a hand-held machine tool. The machine tool 12 is designed as an electric eccentric sander, in particular as a battery-powered eccentric sander. Alternatively, it is conceivable that the machine tool 12 is designed as a fuel-powered eccentric or orbital sander, as a pneumatic eccentric or orbital sander, as an abrasive grinder, as a belt sander, as a drill, as a hand-held circular saw, or the like.

[0029] The machine tool 12 has a tool holder 40. A machining tool 42, in particular a grinding wheel, is arranged on the tool holder 40. The tool holder 40 is formed by a backing plate. For example, the tool holder 40 is formed by a circular backing plate with a hook-and-loop surface. The machining tool 42 arranged on the tool holder 40 of the machine tool 12 is intended to remove particles, in particular dust, from a workpiece during operation. Alternatively, however, it is also conceivable, particularly depending on the design of the machine tool 12, that the machining tool is designed as a cutting disc, an abrasive belt, a milling tool, a saw blade, or the like.

[0030] The machine tool 12 includes a suction port 76. The suction port is arranged on a housing of the machine tool 12. The particle collection device 10 is provided for a detachable connection with the suction port 76.

[0031] The particle collection device 10 comprises a collection unit 14 for collecting the particles removed by the machining tool 42. The collection unit 14 includes a collection container 16. The collection container 16 is designed as a collection vessel. The collection vessel has a substantially cylindrical shape. However, a polygonal shape for the collection vessel is also conceivable. The collection vessel is made of a plastic, in particular a transparent plastic.

[0032] The particle collection device 10 comprises the collection unit 14 for collecting particles. The collection container 16 is designed as a dimensionally stable collection vessel. The shape of the collection container is essentially cylindrical. The collection container 16 is made of a plastic material. The collection container 16 is open at both ends. The collection container 16 is formed at least substantially by a cylindrical shell, in particular a hollow cylindrical shell. The collection unit 14 has a closure element 46 designed as a cap. The closure element 46 is designed to close an opening of the collection container 16. The closure element 46 defines an outlet opening 28. The outlet opening 28 is arranged centrally in the closure element 46. Alternatively, however, it is also conceivable that the outlet opening 28 is arranged laterally offset from a central axis of the closure element 46 running parallel to a longitudinal axis 22.The outlet opening 28 has a shape that deviates from a circular cross-section and has at least one extension 50 that defines a slot-like indentation in the outlet opening 28. In the present embodiment, the shape of the outlet opening has four such extensions 50. This design of the outlet opening 28 with the extensions 50 makes it possible to insert the fluid guide element 26, together with impulse elements 24 extending over an outer surface 44 of the fluid guide element 26, into the collection container 16, in particular without bending the impulse elements 24. Fig. 6).

[0033] In its configuration as a closure cap, the closure element 46 has a screw thread for screwing it onto the collection container 16 of the collection unit 14. The closure element 46 is connected to the collection container 16 by means of a screw connection. Alternatively, however, it is also conceivable that the closure element is arranged on the collection container 16 by means of a plug connection, for example by means of a bayonet connection.

[0034] The particle collection device 10 further comprises a filter unit 18 for filtering particles from a fluid flow passing through the collection container 16. The filter unit 18 comprises a filter element 56 designed as a pleated filter, in particular as a lamellar filter. The filter unit 18 has a hollow cylindrical geometry. However, it is also conceivable that the filter unit 18 has a cylindrical shape, a cuboid shape, or the like. The filter element 18 has an annular cross-sectional shape when viewed in a plane extending perpendicular to the longitudinal axis 22. The outer edges of the pleats of the pleated filter are arranged circularly with respect to the plane perpendicular to the longitudinal axis 22 of the filter unit 18. A filter medium of the filter unit 18 is made of filter paper.Alternatively, the filter medium of the filter unit 18 may be made of a nonwoven fabric, a synthetic material, textiles, fiberglass, a metal mesh, a combination of materials, or the like. The outside of the filter element 56 is exposed to particle-laden air, and particle-filtered air can flow out through a fluid flow channel 74, which is bounded by the filter element 56 and runs parallel to the longitudinal axis 22 of the filter unit 18. The particle-filtered fluid flows out of the particle collection device 10 through the outlet opening 28.

[0035] The filter unit 18 comprises a support element 58. The support element 58 is bonded to an axial end of the filter element 56. The filter unit 18 comprises the support element 58. The support element 58 is arranged at an axial end of the filter element 56, in particular bonded to the material. The support element 58 has a cross-sectional shape that is identical to the cross-sectional shape of the filter element 56, but deviates from a circular cross-sectional shape. In the present embodiment of the filter unit 18 with a filter element 56 designed as a pleated filter, the support element 58 is star-shaped. As in the Fig. 8 and Fig. As shown in detail in Figure 9, the support element 58 comprises at least two radial extensions 60, in this case a plurality of radial extensions 60 shaped like star points. For clarity, only some of the radial extensions 60 are labeled with a reference numeral. The radial extensions 60 are spaced apart from one another along a circumferential direction with respect to their radial ends. In this case, the radial extensions 60 are arranged symmetrically about a central axis of the support element 58 that runs coaxially with the longitudinal axis 22. Alternatively, however, it is also conceivable that the radial extensions 60 are not arranged symmetrically about a central axis of the support element 58 that runs coaxially with the longitudinal axis 22. The radial extensions 60 define the cross-sectional shape of the filter element 56, which deviates from a circular cross-sectional shape.The radial extensions 60 each have a contact surface 62 for contact with the filter element 56 along a circumferential direction of the filter element 56. In this case, the contact surfaces 62 define a receptacle for an arrangement of filter star teeth of the filter element 56, which is designed as a pleated filter. The contact surfaces 62 support the filter element 56 axially, radially, and circumferentially. This results in a positive fit between the contact surfaces 62 and the axial end of the filter element 56, which is designed as a pleated filter, in the radial direction of the filter element 56 and in the circumferential direction of the filter element 56. Alternatively, it is also conceivable that the contact surfaces 62 of the support element 58 are completely surrounded by the filter element 56. In this case, the support element 58 is connected to the axial end of the filter element 56 by means of an adhesive bond.The support element 58 further comprises a cylindrical inner support wall 64 extending parallel to a central axis of the filter element 56. Fig. Figure 9 shows the inner retaining wall 64 in a cross-section through the support element 58. Fig. (8 indicated by the dashed line and looking in the direction of “B”). With respect to the central axis of the filter element 56, the inner support wall 64 is arranged closer to the central axis than the radial extensions 60 of the support element 58. The inner support wall 64 supports an axial end region of the inner edges of the pleats of the filter element 56, which is designed as a pleated filter. In this case, the inner support wall 64 is formed by an annular wall element that extends symmetrically around the longitudinal axis 22 of the filter unit 18. The support element 58 also has at least one sword-shaped mounting centering extension 66. The mounting centering extension 66 is arranged on at least one of the radial extensions 60 on a side of the support element 58, in particular of the radial extension 60, facing away from the filter element 56. In this case, every second radial extension 60 has such a mounting centering extension 66.However, it is also conceivable that only every third or every fourth extension 60, or the like, has such a mounting centering extension 66. The radial extent of the mounting centering extension 66, starting from the midpoint of its axial extent and extending from the support element 58, decreases linearly by 50% of the maximum radial extent of the mounting centering extension 66 in the axial direction away from the support element 58. Alternatively, the mounting centering extension 66 may have a different shape suitable for centering the filter unit 18 in the collection container 16 of the collection unit 14. The support element 58 further comprises a toothed flow optimization geometry 68. The toothed flow optimization geometry 68 is arranged on a side of the support element 58 facing away from the filter element 56.The serrated flow optimization geometry 68 is further arranged adjacent to the at least two radial extensions 60 of the support element 58. A central axis of the serrated flow optimization geometry 68 is arranged coaxially with the central axis of the support element 58. The serrated flow optimization geometry 68 is designed in the present case as a hollow spherical cap in the direction axially away from the support element 58. Alternatively, a differently designed geometry for the serrated flow optimization geometry 68 is conceivable. The support element 58 has a hollow circular cylindrical guide and / or bearing element 72 on a side of the support element 58 facing the filter element 56 for guiding and / or bearing the filter cleaning unit 20. The filter cleaning unit 20 can be inserted into the guide and / or bearing element 72 and is rotatably mounted in the guide and / or bearing element 72.

[0036] The particle collection device 10 further comprises a filter cleaning unit 20 for cleaning the filter element 56 of the filter unit 18. The filter cleaning unit 20 is arranged in the collection container 16. The filter cleaning unit 20 is rotatably mounted about the longitudinal axis 22 relative to the collection container 16 and to the filter unit 18. However, it is also conceivable that the filter cleaning unit 20 is rotatably mounted about the longitudinal axis 22 relative to the collection container 16 or rotatably relative to the filter unit 18. The filter cleaning unit 20 has four impulse elements 24, which, when the filter cleaning unit 20 is rotated, each transmit an impulse to individual pleats of the filter element 56 of the filter unit 18. The filter cleaning unit 20 has a fluid guide element 26 designed as a hollow shaft. The fluid guide element 26 extends over the entire longitudinal extent of the filter unit 18.The fluid guide element 26 directs particle-filtered air on the clean air side of the filter unit 18 through the outlet opening 28 from the collection container 16.

[0037] To rotate the impulse element 24 together with the fluid guide element 26 about the longitudinal axis 22 of the filter cleaning unit 20, an actuating element 54 is arranged on the filter cleaning unit 20. The actuating element 54 is designed as a hand-operated rotary knob. Alternatively, the actuating element 54 can also be actuated by means of a servo motor. The collection container 16 has two locking units 52 to counteract loosening, in particular accidental loosening, of the connection between the collection container 16 and the locking element 46 of the collection unit 14 when the actuating element 54 is actuated. The locking units 52 are designed as axially elastic locking lugs, which engage with a complementary locking geometry arranged on the locking element 46. The two locking lugs are arranged diametrically opposite each other on the collection container 16.Alternatively, it is also conceivable that the collection container has several locking lugs in a different arrangement. The locking units 52, designed as locking lugs, face the locking element 46 in the axial direction. However, it is also conceivable that the locking units 52 are arranged on the outside of the collection container 16. The fluid guide element 26 of the filter cleaning unit 20 has an inlet opening 30, in particular four inlet openings 30 (see also [reference]). Fig. 4) The fluid flows through the inlet openings 30 into an inner channel 32 of the fluid guide element 26. The inlet openings 30 are arranged in an outer wall 34 of the fluid guide element 26, which runs at least substantially parallel to the longitudinal axis 22 of the filter cleaning unit 20. The inlet openings 30 for the fluid into the inner channel 32 of the fluid guide element 26 are arranged in a region facing away from the outlet opening 28 in the outer wall 34 of the fluid guide element 26, which runs substantially parallel to the longitudinal axis 22 of the filter cleaning unit 20. The region facing away extends from the end of the fluid guide element 26 opposite the outlet opening 28 over 20% of the maximum axial length of the fluid guide element 26, which extends parallel to the longitudinal axis 22. The inlet openings 30 are identical and have a circular shape.The diameter of the circular inlet openings 30 is a maximum of 20% of the outer circumference of the fluid guide element 26, perpendicular to the longitudinal axis 22. Two inlet openings 30 are arranged axially offset from each other in the outer wall 34 of the fluid guide element 26. Furthermore, two inlet openings 30 are arranged diametrically opposite each other in the outer wall 34 of the fluid guide element 26. Alternatively, the inlet openings 30 may have a shape other than circular, for example, an oval, rectangular, or polygonal shape.

[0038] The fluid guide element 26 has a locking element 48 that partially delimits an inner channel 32 of the fluid guide element 26, enabling it to lock with the closure element 46. The locking element 48 is designed as a spring-loaded locking element. This locking element 48 is a rectangular section of the fluid guide element 26, free on three sides, with a main extension parallel to the longitudinal axis 22 of the filter cleaning unit 20, and a locking lug at its free end. In the present embodiment, the fluid guide element 26 has two such locking elements 48. The filter cleaning unit 20 has a pulse element 24. In this embodiment, the pulse element 24 is trapezoidal. Alternatively, another shape, for example a rectangular shape, for the pulse element 24 is conceivable.The impulse element 24 is arranged eccentrically offset to the longitudinal axis 22 of the filter cleaning unit 20 on the fluid guide element 26.

[0039] Furthermore, the impulse element 24 is arranged on an inner wall 36 of the fluid guide element 26, which defines the inner channel 32 of the fluid guide element 26. The impulse element 24 extends through a fluid guide element recess 38 of the fluid guide element 26, which is bounded by an outer wall 34 of the fluid guide element 26. The impulse element 24 extends across the outer surface 44 of the fluid guide element 26 in a direction perpendicular to the longitudinal axis 22 of the filter cleaning unit 20. The impulse element 24 has a principal axis of extension that forms an angle other than 90° with the outer surface 44 of the fluid guide element 26, which runs parallel to the longitudinal axis 22 of the filter cleaning unit 20.

[0040] The filter cleaning unit 20 has at least one further impulse element 24 offset along the longitudinal axis 22 relative to the impulse element 24. The further impulse element 24 is arranged on the inner wall 36 of the fluid guide element 26, which defines the inner channel 32 of the fluid guide element 26. The further impulse element 24 extends through a further fluid guide element recess 38 of the fluid guide element 26, which is bounded by the outer wall 34 of the fluid guide element 26. The further impulse element 24 also extends across the outer surface 44 of the fluid guide element 26 in a direction perpendicular to the longitudinal axis 22 of the filter cleaning unit 20. The fluid guide element recess 38 and the further fluid guide element recess 38 are arranged offset from each other by 90° in a circumferential direction of the fluid guide element 26.However, it is also conceivable that the fluid guide element recess 38 and the further fluid guide element recess 38 are arranged offset from each other by a smaller angle. In the present case, the filter cleaning unit 20 comprises two impulse elements 24, each of which is arranged on the inner wall 36 of the fluid guide element 26 and each has a principal axis of extension, wherein the principal axes of extension of the impulse elements 24 extend parallel to each other in an unloaded state. In particular, the illustrated embodiment has four such fluid guide element recesses 38. In the illustrated embodiment, the impulse elements 24 are arranged on the inner wall 36 of the fluid guide element 26, which delimits the inner channel 32 of the fluid guide element 26. The impulse elements 24 each extend through one of the four fluid guide element recesses 38 of the fluid guide element 26. The impulse elements 24 extend over the outer surface 44 of the fluid guide element 26.Two impulse elements 24 are arranged opposite each other on the inner wall 36 of the fluid guide element 26. These two pairs of oppositely arranged impulse elements 24 are axially offset from each other along the fluid guide element 26. Furthermore, these two pairs of oppositely arranged impulse elements 24 are radially rotated 90° relative to each other. Fig. 4 and the one in Fig. 5 Cross-section through the fluid guiding element 26 shown (cf. Fig. Figure 4 (along the dashed line and looking towards B) shows the arrangement of the impulse elements 24 and the respective fluid guide element recesses 38 of the present embodiment.

[0041] The collection unit 14 of the particle collection device 10 comprises a further closure element 78. This further closure element 78 is designed as a closure cap. The further closure element 78 is arranged on the side of the collection unit 14 facing the machine tool 12. The further closure element 78 has an inlet opening 80. The inlet opening 80 allows particle-laden fluid to flow from the extraction port 76 of the machine tool 12 into the collection container 16. The further closure element 78 is connected to the collection container 16 of the collection unit 14 by means of a screw connection. Alternatively, however, it is conceivable that the further closure element 78 is connected to the collection container 16 of the collection unit 14 by means of a bayonet connection, a clamping connection, or the like.

[0042] The particle collection device 10 is detachably connected to the extraction port 76 of the machine tool 12 via the additional locking element 78. Alternatively, it is also conceivable that the particle collection device 10 is permanently connected to the extraction port 76 of the machine tool 12. The particles removed from the workpiece by the machining tool 42 are guided from the workpiece through the extraction port 76 and the inlet opening 80 into the particle collection device 10 by an airflow generated by a fan wheel for motor cooling (not shown here). However, it is also conceivable that the machine tool 12 has a combination fan wheel, which has fan blades for motor cooling and additional blades for dust extraction.Alternatively, the removed particles can be directed into the particle collection device 10 by a fan of the machine tool 12, which is designed separately as a motor cooling fan and by means of which an airflow for dust extraction can be generated. Other embodiments of the machine tool 12 for generating an airflow for dust extraction that would appear sensible to a person skilled in the art are also conceivable.

[0043] The filter unit 18 further comprises an additional support element 70. In the present embodiment, the closure element 46 forms the additional support element 70. Alternatively, however, it is also conceivable that the additional support element 70 is a separate element from the closure element 46. The additional support element 70 defines the outlet opening 28 for the discharge of the particle-filtered fluid from the filter element 56. The additional support element 70 is materially bonded to the filter element 56 at an end of the filter element 56 facing away from the support element 58. The filter element 56 is arranged on the additional support element 70 such that the extensions 50 are located within the fluid flow channel 74 defined by the filter element 56.

[0044] The outer surface of the filter element 56, facing radially away from the longitudinal axis 22, is exposed to particle-laden air, and particle-filtered air can flow out through the fluid flow channel 74, which is bounded by the filter element 56 and runs parallel to the longitudinal axis 22 of the filter unit 18. The particle-filtered fluid flows out of the filter unit 18 through the outlet opening 28 ( Fig. 7).

Claims

[1] Particle collection device (10), in particular dust box, for a machine tool (12), in particular an eccentric or orbital sander, comprising at least one collection unit (14) for collecting particles, which has at least one collection container (16), in particular a collection vessel, comprising at least one filter unit (18), in particular arranged in the collection container (16), for filtering particles from a fluid flowing through the collection container (16), and comprising at least one filter cleaning unit (20) arranged on the collection container (16), which has at least one longitudinal axis (22) about which the filter cleaning unit (20) is rotatably mounted relative to the collection container (16) and / or to the filter unit (18), and comprising at least one impulse element (24), in particular an impact projection, which is provided for transmitting an impulse to the filter unit (18), in particular to individual pleats of a pleated filter of the filter unit (18), characterized by, that the filter cleaning unit (20) has at least one fluid guiding element (26), in particular a hollow body, preferably a hollow shaft, which extends at least substantially over an entire longitudinal extent of the filter unit (18) and is provided for the discharge of the fluid, in particular particle-filtered fluid, through an outlet opening (28) from the collection container (16). [2] Particle collection device (10) according to claim 1, characterized by , that the fluid guiding element (26) has at least one inlet opening (30), in particular several inlet openings (30), for the fluid into a cavity and / or into an inner channel (32) of the fluid guiding element (26), which is arranged in an outer wall (34) of the fluid guiding element (26) which runs at least substantially parallel to the longitudinal axis (22) of the filter cleaning unit (20). [3] Particle collection device (10) at least according to the preamble of claim 1, in particular according to claim 1 or 2, characterized by , that the impulse element (24) is arranged eccentrically offset to the longitudinal axis (22) of the filter cleaning unit (20) on a fluid guide element, in particular on the fluid guide element (26). [4] Particle collection device (10) according to any one of the preceding claims, characterized by , that the fluid guiding element (26) has at least one inlet opening (30), in particular several inlet openings (30), for the fluid into a cavity and / or into an inner channel (32) of the fluid guiding element (26), which is arranged in an area facing away from the outlet opening (28) in an outer wall (34) of the fluid guiding element which runs at least substantially parallel to the longitudinal axis (22) of the filter cleaning unit (20). [5] Particle collection device (10) according to any one of the preceding claims, characterized by, that the impulse element (24) is arranged on an inner wall (36) of the fluid guide element (26), in particular defining an inner channel (32) of the fluid guide element (26), and extends through a fluid guide element recess (38) of the fluid guide element (26), in particular a fluid guide element outer wall opening, which is bounded by an outer wall (34) of the fluid guide element (26), wherein the impulse element (24) extends over an outer surface (44) of the fluid guide element (26), preferably along a direction transverse, in particular perpendicular, to the longitudinal axis (22) of the filter cleaning unit (20). [6] Particle collection device (10) according to any one of the preceding claims, characterized by, that the filter cleaning unit (20) comprises at least one further impulse element (24) offset along the longitudinal axis (22) relative to the impulse element (24), which is arranged on an inner wall (36) of the fluid guide element (26), in particular limiting an inner channel (32) of the fluid guide element (26), and which extends through a further fluid guide element recess (38) of the fluid guide element (26), in particular a further fluid guide element outer wall opening, which is limited by the outer wall (34) of the fluid guide element (26), wherein the further impulse element (24) extends over the outer surface (44) of the fluid guide element (26), preferably along a direction transverse, in particular perpendicular, to the longitudinal axis (22) of the filter cleaning unit (20). [7] Particle collection device (10) according to claims 5 and 6, characterized by, that the fluid guide element recess (38) and the further fluid guide element recess (38) are arranged offset from each other in a circumferential direction of the fluid guide element (26), in particular offset from each other by 90°. [8] Particle collection device (10) according to any one of the preceding claims, characterized by , that the filter cleaning unit (20) comprises at least two impulse elements (24) which are each arranged on an inner wall (32) of the fluid guide element (26) and each have a principal extension axis, wherein the principal extension axes of the impulse elements (24), in particular in an unloaded state, extend at least substantially parallel to each other or at an angle to each other. [9] Particle collection device (10) according to any one of the preceding claims, characterized by, that the impulse element (24) comprises a principal extension axis which forms an angle of 90° with an outer surface (44) of the fluid guide element (26), in particular at least substantially parallel to the longitudinal axis (22) of the filter cleaning unit (20). [10] Particle collection device (10) at least according to the preamble of claim 1, in particular according to one of the preceding claims, characterized by , that the collection unit (14) has at least one closure element (46), in particular at least one closure cap, which at least limits the outlet opening (28) of the collection container (16), and that the fluid guide element (26) has at least one locking element (48), in particular at least partially limiting an inner channel (32) of the fluid element (26), for locking with the closure element (46). [11] Particle collection device (10) at least according to the preamble of claim 1, in particular according to one of the preceding claims, characterized by , that the collection unit (14) has at least one closure element (46), in particular at least one closure cap, which at least limits the outlet opening (28) of the collection container (16), wherein the outlet opening (28) has a cross-sectional shape, in particular deviating from a circular cross-section, preferably having at least one extension (50) limiting a slot-like indentation of the outlet opening (38), which is provided to enable the insertion of a fluid guiding element, in particular the fluid guiding element (26), together with the impulse element (24) extending over an outer surface (44) of the fluid guiding element (26) into the collection container (16). [12] Particle collection device (10) at least according to the preamble of claim 1, in particular according to one of the preceding claims, characterized by at least one safety unit (52) which is provided to prevent the loosening of a connection between the collection container (16) and a closure element (46), in particular a closure cap, of the collection unit (14), on which at least one actuating element (54) of the filter cleaning unit (20) is arranged, which is provided to rotate the impulse element (24) together with a fluid guide element (26), in particular the fluid guide element (26), about the longitudinal axis (22) of the filter cleaning unit (20). [13] Filter cleaning unit (20) for a particle collection device (10) according to one of the preceding claims. [14] Machine tool (12), preferably hand-held machine tool, in particular eccentric or vibratory sander, with at least one particle collection device (10) according to one of claims 1 to 12.

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