Cleaning device for a bar-shaped structure and cleaning method for removing impurities

Abstract

The invention relates to a cleaning device (10) for removing impurities (12) from a bar-shaped structure (14), having a drive unit (16) and two roughing discs (18a, 18b) which can be driven to rotate about a common axis of rotation (20), wherein at least one roughing disc (18a, 18b) can be driven by the drive unit (16), wherein the roughing discs (18a, 18b) form, along the common axis of rotation (20), a receiving region (32) for the bar-shaped structure (14), wherein each roughing disc (18a, 18b) has, on a side facing the receiving region (32), a plurality of roughing projections (34), and wherein the roughing discs (18a, 18b) are formed along the axis of rotation (20) in a movably sprung manner in order to cause, in a state in which they are arranged on the bar-shaped structure (14), the roughing discs (18a, 18b) to be pushed onto both sides of the bar-shaped structure (14). The invention further relates to a cleaning device (100) for removing impurities (12) from a bar-shaped structure (12).

Description

[0001] Cleaning device for a web-like structure and cleaning method for removing contaminants

[0002] Background of the invention

[0003] The invention relates to a cleaning device for removing contaminants from a web-like structure. The invention further relates to a cleaning method.

[0004] Such cleaning devices and processes are used, for example, in the cleaning of production pallets used to support plate blanks during the laser production of workpieces. The plate blanks are positioned on web-like support bars of the production pallet and moved together with the production pallet into the processing area of ​​the laser processing machine. During laser processing of the plate blanks, slag is created due to the melting of the plate blanks, which adheres to the support bars. If the adhering slag is not removed, the support bar and / or the entire production pallet must be replaced, as proper positioning of the plate blanks is otherwise no longer possible.

[0005] Cleaning devices are typically used to clean the support rails. These cleaning devices are mounted on the support rail to be cleaned and, using reciprocating tools, scrape off the slag adhering to the support rail. However, due to structural reasons, the slag can only be scraped off to a minimal thickness, thus preventing complete removal of the contaminants.

[0006] As laser power continues to increase during workpiece production, slag adheres more strongly to the support strips, which cannot be adequately removed using conventional cleaning devices.

[0007] Object of the invention

[0008] It is an object of the invention to carry out the cleaning of web-like structures quickly and easily and to increase the cleaning quality.

[0009] Description of the invention This object is achieved according to the invention by a cleaning device according to claim 1. The object is further achieved by a cleaning method according to claim 15.

[0010] According to the invention, a cleaning device is provided. The cleaning device is suitable for removing contaminants from a web-like structure. The term "web-like structure" is defined here as an elongated object which can be moved along the longitudinal axis by the cleaning device. In particular, the cleaning device is suitable for removing slag from a support strip of a pallet for workpieces to be manufactured in a laser cutting machine. The cleaning device has at least one drive unit and two grinding disks which can be driven to rotate about a common axis of rotation. The term "grinding disk" is defined here as a disk which is suitable for removing contaminants by means of a rotational movement. Of the two grinding disks, at least one, preferably each, grinding disk can be driven by the drive unit.The grinding discs are arranged spaced apart from one another along the common axis of rotation. The grinding discs form a receiving area for the web-like structure. In other words, the receiving area for the web-like structure is formed between the grinding discs. Each grinding disc has several grinding projections on a side facing the receiving area. The grinding discs are designed to be resiliently movable along the axis of rotation in order to press the grinding discs against the web-like structure on both sides when arranged on the web-like structure.

[0011] In other words, a cleaning device is proposed which removes contaminants from a web-like structure by applying two rotating, driven grinding wheels to both sides of the web-like structure to be cleaned. The grinding wheels are arranged on the cleaning device so that they can be moved transversely to the web-like structure to ensure readjustment of the grinding wheels during continuous removal of the contaminants. In this way, complete removal of even heavily adherent contaminants can be ensured. A further advantage is that the cleaning device is adaptable to different web widths of the web-like structures to be cleaned.

[0012] According to the invention, grinding discs are provided. The removal of contaminants preferably occurs via a respective side surface of the grinding discs. In other words, the grinding disc can be moved in the axial direction or along its rotational axis into contact with the contaminant, while the peripheral side of the grinding disc preferably has no cleaning function. The grinding discs can be designed for grinding and / or impact material removal.

[0013] Preferably, the grinding wheels engage with the contamination in both abrasive and impact action, which can achieve a high removal rate of the contamination.

[0014] The grinding discs are arranged on the cleaning device so that they can move along the rotational axis. In other words, the grinding discs are movable transversely to the web-like structure to be cleaned. This allows the grinding discs to be moved or displaced to the side to facilitate the arrangement of the cleaning device on the web-like structure. According to the invention, the grinding discs are also arranged in a resilient manner. For the resilient arrangement, technical springs, preferably compression springs, particularly preferably spiral springs, can be used. This enables the grinding discs to be reliably pressed against the web-like structure.

[0015] During operation of the cleaning device, the grinding discs preferably have a speed between 1000 and 6000 revolutions per minute, particularly preferably between 2000 and 5000 revolutions per minute. This allows for effective removal of the contamination without unnecessarily high wear on the grinding discs.

[0016] In a preferred embodiment of the cleaning device, the grinding wheels are arranged parallel to each other. This enables a compact and structurally simple design of the cleaning device, which can reduce manufacturing costs.

[0017] Further preferred is an embodiment of the cleaning device in which the grinding discs form a tapered receiving area section in a radially inward direction. In other words, the receiving area becomes narrower with increasing penetration depth of the web-like structure. This allows for continuously increasing removal of the contamination, whereby noise generation during cleaning of the web-like structure can be reduced. Preferably, the receiving area on the radially outer side of the grinding discs is wider than a width of the web-like structure to be cleaned. In other words, the receiving area can have a so-called entry angle. This makes it easier to place the cleaning device onto the web-like structure.

[0018] In a preferred embodiment of the cleaning device, the grinding discs form a widening receiving area section in a radially inward direction, adjoining the tapered receiving area section. This allows the maximum material removal by the cleaning device to be limited to a roughing width. In this case, the roughing width represents the smallest distance between the grinding discs. Once the web-like structure has reached the roughing width, no further material removal takes place. This reliably prevents unnecessary material removal.

[0019] A preferred embodiment of the cleaning device is one in which the roughing projections are formed as a surface grain on the grinding disc. This allows the grinding discs to be manufactured particularly quickly and inexpensively, which can reduce the manufacturing and operating costs of the cleaning device. The surface grain preferably has increased hardness and toughness. Particularly preferably, the surface grain is formed by applying segments of corundum, silicon carbide, cubic boron nitride, and / or synthetic diamond to the surface of the grinding disc. This can extend the service life of the grinding discs.

[0020] A particularly preferred embodiment of the cleaning device is one in which the roughing projections are designed as blade strips arranged on the grinding disc. The blade strips can be detachably attached to a grinding disc base body. This allows individual roughing projections to be replaced while reusing the remaining grinding disc, thus keeping repair costs low.

[0021] In a preferred embodiment of the cleaning device, it has a structural stop for limiting the penetration depth of the grinding discs in a penetration direction into the web-like structure. Misuse due to excessive penetration of the cleaning device can be reliably prevented in this way. The structural stop can be designed to rest on a web-like structure. Preferably, the structural stop is designed to rest on multiple web-like structures. This can be possible, for example, with parallel support strips of a pallet. The structural stop can also prevent the cleaning device from tipping over during operation.

[0022] Particularly preferably, the structural stop is designed to be adjustable, in particular continuously adjustable by adjusting the mounting of the grinding discs. In other words, the structural stop can be designed to adapt the penetration depth to the web-like structure. This allows the cleaning device to be used even more flexibly for a variety of different web-like structures.

[0023] A preferred embodiment of the cleaning device is one in which the grinding wheels are driven by at least one belt drive. A belt drive represents a particularly reliable form of power transmission and has low manufacturing and maintenance costs.

[0024] A further preferred embodiment of the cleaning device is one in which the grinding discs are each arranged on a drive shaft. This allows the grinding discs to be decoupled from one another, allowing the grinding discs to be operated at different speeds and / or directions of rotation, if necessary. This allows the cleaning device to be adapted even more flexibly to the web-like structures to be cleaned and / or contaminants to be removed.

[0025] In a preferred embodiment of the cleaning device, the grinding discs rotate in opposite directions. This allows the torques of the grinding discs to cancel each other out, which improves the handling of the cleaning device. Opposing speeds can be achieved, for example, by using multiple belt drives and / or a gearbox. In a preferred development, the cleaning device has two drive units, with the grinding discs each being driven by one of the drive units. This allows the performance of the cleaning device to be increased if necessary. This can be the case, for example, when web-like structures are to be cleaned, which require a larger diameter of the grinding discs.

[0026] A preferred embodiment of the cleaning device is one in which it has a spreading device, wherein the spreading device is designed to expand the receiving area. A spreading device can simplify the arrangement on the web-like structure and / or the removal from the web-like structure by temporarily increasing the distance between the grinding discs.

[0027] In a particularly preferred embodiment of the cleaning device, the spreading device is designed as a lever system. A lever system allows for manual widening of the receiving area using levers. This represents a particularly cost-effective and robust means.

[0028] Furthermore, an embodiment of the cleaning device comprising a web guide is preferred, wherein the web guide guides the cleaning device parallel to the grinding discs in a feed direction of the cleaning device. This can prevent misuse due to rotation of the cleaning device relative to the web-like structure.

[0029] In a preferred embodiment of the cleaning device, the web guide comprises four guide rollers, wherein the guide rollers can be arranged perpendicular to the feed direction and the rotation axis. Two of the four guide rollers can be positioned upstream of the grinding discs in the feed direction, and two of the four guide rollers can be positioned downstream of the grinding discs in the feed direction. This allows the cleaning device to be guided while simultaneously preventing circumferential contact of the grinding discs with obstacles present along the web-like structure—for example, a pallet edge framing several support strips.

[0030] Preferably, the guide rollers are rotatably mounted on the cleaning device or have a rotatable peripheral portion adjacent to the web-like structure. This allows the web to be guided with particularly low friction.

[0031] Further preferably, the guide rollers can have a rubberized surface. The rubberized surface is preferably in contact with the web-like structure during operation of the cleaning device. This can reduce the generation of vibrations and noise.

[0032] A particularly preferred embodiment of the cleaning device is one in which the guide rollers protrude beyond the grinding discs in a penetration direction. In other words, the guide rollers form a protective stop in the penetration direction. This prevents unintentional contact between the peripheral sides of the grinding discs.

[0033] A particularly preferred further development of the cleaning device is one in which the cleaning device has two parallel guide plates, with an upstream guide roller and a downstream guide roller each connected by a guide plate. The guide plates are preferably arranged at the far end of the guide rollers. This allows the web guide to be designed to be particularly robust. Furthermore, a protective stop in the penetration direction can be designed to be particularly secure.

[0034] The object underlying the invention is further achieved by a cleaning method. The cleaning method is suitable for removing contaminants from a web-like structure. In particular, the cleaning method is suitable for removing slag from a support bar of a pallet for workpieces to be manufactured in a laser cutting machine. According to the invention, the cleaning device described above and below is provided for removing the contaminants. The cleaning method comprises the following steps: a) arranging the web-like structure between the grinding wheels; b) moving the cleaning device along the web-like structure.

[0035] Moving the cleaning device means moving it forward and / or backward along the web-like structure. Preferably, the direction of rotation is adjusted when changing the direction of movement. In rare cases, it may be provided that the cleaning device is lifted, rotated, and placed on the same web-like structure again.

[0036] The process steps can be performed several times, especially multiple times. This allows for particularly effective removal of contaminants. Preferably, a different web-like structure to be cleaned is provided before the process steps are repeated.

[0037] Further features and advantages of the invention will become apparent from the description, the claims, and the drawings. According to the invention, the above-mentioned and further-described features can be used individually or in combination in any convenient way. The embodiments shown and described are not intended to be exhaustive, but rather are exemplary in nature for describing the invention.

[0038] Detailed description of the invention and drawing

[0039] Fig. 1 shows a first embodiment of the cleaning device arranged on a web-like structure; Fig. 2 shows the embodiment of the cleaning device according to Fig. 1 with protective hoods;

[0040] Fig. 3 shows the cleaning device from Fig. 2 in a perspective view of its underside;

[0041] Fig. 4 shows the cleaning device according to Figs. 1 to 3 with a web guide in a perspective view on its underside;

[0042] Fig. 5 shows the cleaning device from Fig. 4 in a side view;

[0043] Fig. 6 shows the cleaning device from Figs. 4 and 5 with a first

[0044] Embodiment of a grinding wheel in a sectional view;

[0045] Fig. 7 shows a second embodiment of a grinding disc in a perspective view;

[0046] Fig. 8 shows a cleaning method according to the invention in a schematic representation.

[0047] Fig. 1 shows a cleaning device 10 for removing contaminants 12 from a web-like structure 14 in a state arranged on the web-like structure 14. The cleaning device 10 can be arranged, for example, on a support bar (not shown) of a pallet (not shown) for a laser cutting machine (not shown) to remove contaminants 12, usually metal slag, that adheres to the support bar during the production of workpieces (not shown) in the laser cutting machine.

[0048] According to the illustrated embodiment, the cleaning device 10 has a single drive unit 16. Furthermore, the cleaning device 10 has two grinding discs 18a, 18b. The grinding discs 18a, 18b can be predominantly rotationally symmetrical. The grinding discs 18a, 18b are designed to rotate about a common axis of rotation 20. According to the illustrated embodiment, the grinding discs 18a, 18b can also be driven by the single drive unit 16. To drive the grinding discs 18a, 18b, the cleaning device 10 here has a belt drive 22 that connects the drive unit 16 to a drive shaft 24a of the grinding disc 18a. The drive shaft 24a can be designed to drive both grinding discs 18a, 18b.Furthermore, as shown, it can be provided that the grinding disc 18a is arranged on and / or at the drive shaft 24a, and the grinding disc 18b is arranged and / or formed on its own separate drive shaft 24b. In this case, torque can be transmitted from the drive shaft 24a to the drive shaft 24b, for example, through a torque-transmitting connection, for example, an axial pinning of the drive shafts 24a, 24b.

[0049] The grinding wheels 18a, 18b can have the same direction of rotation 26a, 26b during operation of the cleaning device 10. This allows for simple and cost-effective production of the cleaning device 10. The directions of rotation 26a, 26b are preferably adapted to a feed direction 28 along a feed axis 30. Particularly preferably, the grinding wheels 18a, 18b exit the web-like structure 14 on the side of the grinding wheels 18a, 18b upstream in the feed direction 28 and enter the web-like structure 14 on the side of the grinding wheels 18a, 18b downstream in the feed direction 28. This corresponds to the arrow directions of the directions of rotation 26a, 26b shown in Fig. 1. In other words, contaminants 12 are roughened by the web-like structure 14 in the direction of the cleaning device 10. This allows the removal of contaminants 12 to be carried out more effectively.

[0050] Alternatively or additionally, each drive shaft 24a, 24b can be driven by its own belt drive 22. This eliminates the need for torque transmission between the drive shafts 24a, 24b.

[0051] In a particularly preferred embodiment, the direction of rotation 26a can be opposite to the direction of rotation 26b. This allows the forces and torques generated by the grinding discs 18a, 18b to be balanced during operation of the cleaning device 10, thus simplifying handling of the cleaning device 10. Alternatively or additionally, each drive shaft 24a, 24b can be driven by its own drive unit 16. In other words, in this embodiment, the cleaning device 10 has at least two drive units 16. This allows the performance of the cleaning device 10 to be increased.

[0052] The grinding wheels 18a, 18b form a receiving area 32 for the web-like structure 14 along the rotational axis 20, which approximately corresponds to the distance between the grinding wheels 18a, 18b. In other words, the web-like structure 14 can be arranged at least partially between the two grinding wheels 18a, 18b. This allows the contaminants 12 to be effectively removed from both sides of the web-like structure 14 in a cleaning process. The receiving area 32 can be formed, for example, by a structural design of the grinding wheels 18a, 18b and / or by spacing the grinding wheels 18a, 18b along the common rotational axis 20.

[0053] Each of the grinding wheels 18a, 18b has a plurality of roughing projections 34 on a side facing the receiving area 32. In other words, the roughing projections 34 protrude beyond the respective grinding wheel 18a, 18b into the receiving area 32. According to Fig. 1, the roughing projections 34 take the form of a surface roughness formed on the respective grinding wheel 18a, 18b. For example, the surface roughness can be formed by diamond segments incorporated into the grinding wheels 18a, 18b.

[0054] According to the invention, the grinding discs 18a, 18b are designed to be resiliently movable along the rotation axis 20. When not arranged on the web-like structure 14, the receiving area 32 typically has a receiving area width 36 along the rotation axis 20 that is predominantly smaller than a web width 38 of the web-like structure 14. When the cleaning device 10 is arranged on the web-like structure 14, the web-like structure 14 displaces the grinding discs 18a, 18b against a restoring force, typically against a spring force. This allows the grinding discs 18a, 18b to be pressed against the web-like structure 14 on both sides, thereby ensuring permanent contact between the grinding discs 18a, 18b during the removal of the contaminants 12.In other words, the grinding discs 18a, 18b can be displaced along the rotation axis 20 in the direction of the web-like structure 14 when the web width 38 of the web-like structure 14 is reduced during cleaning. This is the case, for example, when the contaminant 12 is removed from the web-like structure 14. A further advantage of the resiliently movable grinding discs 18a, 18b is that the receiving area 32 can be flexibly adapted to different web widths 38 of the web-like structures 14 to be cleaned. An otherwise necessary retooling of the cleaning device 10 can thus be eliminated.

[0055] The cleaning device 10 can be moved along the feed axis 30 on the web-like structure 14 to remove the contaminants 12. The cleaning device 10 can be moved several times along the feed axis 30 to remove the contaminants 12 particularly effectively. Particularly preferably, the cleaning device 10 can be moved forward and / or backward along the feed axis 30. This eliminates the need to lift and rotate the cleaning device 10. In this case, it can be provided that the direction of rotation 26a and / or the direction of rotation 26b is changed when the feed direction 28 changes.

[0056] According to the embodiment shown in Fig. 1, the cleaning device 10 can have a structural stop 40. The structural stop 40 can be designed for placing the cleaning device 10 on one or more web-like structures 14. The structural stop 40 can limit a penetration depth 42 of the cleaning device 10 into the web-like structure 14. The penetration depth 42 is preferably perpendicular to the feed axis 30 and / or perpendicular to the rotation axis 20. This allows the contaminants 12 to be removed particularly evenly and effectively.

[0057] Fig. 2 shows the cleaning device 10 from Fig. 1. The cleaning device 10 can have a spreading device 44, as shown. By means of the spreading device 44, the distance between the grinding wheels 18a, 18b (see Fig. 1) can be increased. This enables particularly low-resistance placement on and / or removal from the web-like structure 14 (see Fig. 1). Furthermore, the cleaning device 10 can be more easily removed from the web-like structure 14 by means of the spreading device 44, for example, if it becomes jammed during cleaning. This can prevent disassembly, which would otherwise be necessary.

[0058] The spreading device 44 can be designed, for example, as a lever system 46. The lever system 46 can, as shown, have a spreading plate 48, two first spreading levers 50a, and two second spreading levers 50b. The spreading device 44 or the lever system 46 is preferably designed symmetrically to the feed axis 30. The spreading plate 48 is arranged on the cleaning device 10 so as to be movable along the feed axis 30. A first spreading lever 50a can be rotatably arranged at one end on the spreading plate 48 and at the other end on the second spreading lever 50b. A second spreading lever 50b can be rotatably arranged directly or indirectly on a grinding disk 18a, 18b at an end facing away from the end arranged on the first spreading lever 50a.In each case, a second spreading lever 50b can be rotatably mounted on the cleaning device 10 by means of a bearing point 52, wherein in each case a rotatable bearing point 52 is formed between the end arranged on the first spreading lever 50a and the end arranged on the grinding disc 18a, 18b.

[0059] By moving the spreader plate 48 along the feed axis 30—here in the feed direction 28—the rough grinding discs 18a, 18b can be spread apart. A spread angle 54 between one of the first spreader levers 50a and the respective second spreader lever 50b can be changed, whereby the ends of the second spreader levers 50b arranged on the rough grinding discs 18a, 18b are spaced further apart from one another along the rotation axis 20 or moved in opposite directions. The cleaning device 10 can, as shown, have a protective hood 56 for covering the rough grinding discs 18a, 18b and / or a protective hood 58 for covering the belt drive 22 (see Fig. 1). This effectively prevents unintentional engagement with the rotating rough grinding discs 18a, 18b and / or the belt drive 22 during operation of the cleaning device 10.In addition, by covering the grinding discs 18a, 18b, the surroundings can be protected from the separated and possibly thrown-away contaminant 12 (see Fig. 1).

[0060] Fig. 3 shows the cleaning device 10 from Fig. 2 in a perspective view looking towards the side of the cleaning device 10 facing the web-like structure 14 (see Fig. 1) during operation of the cleaning device 10.

[0061] The grinding discs 18a, 18b can protrude in the penetration direction. The penetration depth 42 of the cleaning device 10 can be determined by the projection of the grinding discs 18a, 18b. According to the illustrated embodiment, the penetration depth 42 of the grinding discs 18a, 18b is limited by the structural stop 40. In other words, during operation of the cleaning device 10, the structural stop 40 can bear against the web-like structure 14 and / or an adjacent web-like structure 14, thereby preventing the grinding discs 18a, 18b from penetrating further into the web-like structure 14. The penetration depth 42 can be adjustable by moving the structural stop 40.

[0062] Fig. 4 shows a further embodiment of the cleaning device 10.

[0063] The cleaning device 10 has a web guide 60. The web guide 60 is preferably designed parallel to the longitudinal axis of the grinding wheels 18a, 18b. The web guide 60 can be designed to engage the web-like structure 14 to be cleaned (see Fig. 1). This allows the cleaning device 10 to be moved particularly easily along the feed axis 30 of the cleaning device 10, parallel to the web-like structure 14.

[0064] According to the illustrated embodiment, the web guide 60 can have several – here four – guide rollers 62a, 62b. As can be seen in Fig. 4, the guide rollers 62a, 62b of the web guide 60 run parallel to the longitudinal axis of the grinding wheels 18a, 18b, and in Fig. 4 perpendicular to the feed axis 30. The guide rollers 62a, 62b are preferably arranged at right angles to the feed axis 30 and / or the rotation axis 20 on the cleaning device 10. The guide rollers 62a, 62b are particularly preferably rotatably mounted on the cleaning device 10 and / or have a contact surface that is rotatable relative to the cleaning device 10 and, during operation of the cleaning device 10, is in contact with the web-like structure 14 to be cleaned. This allows the cleaning device 10 to be guided with particularly low friction.

[0065] The guide rollers 62a and 62b can be arranged along the feed axis 30 on opposite sides of the grinding wheels 18a, 18b. In other words, depending on the feed direction 28 along the feed axis 30, the guide rollers 62a and 62b can be arranged upstream of the grinding wheels 18a, 18b, and the respective other guide rollers 62b, 62a can be arranged downstream of the grinding wheels 18a, 18b. According to the feed direction 28 shown in Fig. 4, the guide rollers 62a are thus arranged upstream and the guide rollers 62b are arranged downstream.

[0066] The guide rollers 62a and 62b are typically spaced apart from one another and each form a guide region for receiving the web-like structure 14. Preferably, the guide rollers 62a, 62b are each designed to be resiliently movable in a transverse direction to the feed axis 30, in particular along the rotation axis 20. This allows the web guide 60 to be adapted to the web width 38 (see Fig. 1). In particular, the guide rollers 62a, 62b arranged downstream of the grinding discs 18a, 18b in the feed direction or feed direction 28 can have a smaller spacing than the upstream guide rollers 62a, 62b, since the web width 38 can decrease as a result of cleaning.

[0067] A guide roller 62a and a guide roller 62b can each form a guide roller pair 64a, 64b. The guide rollers 62a, 62b of a guide roller pair 64a, 64b can be connected by a guide plate 66a, 66b. This allows the guide rollers 62a, 62b of a guide roller pair 64a, 64b to be moved particularly evenly.

[0068] Fig. 5 shows the cleaning device 10 from Fig. 4 in a side view. According to the illustrated embodiment, the guide rollers 62a, 62b protrude further beyond the structural stop 40 in the direction of the penetration depth 42 than the grinding discs 18a, 18b. This prevents contact between the peripheral sides of the grinding discs 18a, 18b and the web-like structure 14 (see Fig. 1) and / or a support (not shown) of the web-like structure 14.

[0069] During operation of the cleaning device 10, the cleaning device 10 can be moved bidirectionally along the feed axis 30. In other words, the cleaning device 10 can be moved from left to right and / or from right to left, as shown. In the latter case, the web-like structure 14 is first guided over the upstream guide rollers 62a into the receiving area 32 (see Fig. 1) between the grinding disks 18a, 18b. The cleaning device 10 is moved further over the web-like structure 14, whereby a contaminant 12 (see Fig. 1) is removed by the grinding disks 18a, 18b. The web-like structure 14 is then guided over the downstream guide rollers 62b.

[0070] Fig. 6 shows the cleaning device 10 from Fig. 5 rotated by 90° according to section AA indicated in Fig. 5. The grinding discs 18a, 18b are arranged on the drive shafts 24a, 24b in a rotationally fixed manner. In other words, the grinding discs 18a, 18b can be driven in rotation by the drive shafts 24a, 24b and can also be moved along the axis of rotation 20 up to a stop. According to the embodiment shown, a sliding sleeve 68 can be provided on each drive shaft 24a, 24b, which can be arranged so as to slide along the axis of rotation 20 on the respective drive shaft 24a, 24b. The sliding sleeve 68 preferably has a flange region 70 against which the respective grinding disc 18a, 18b can be placed. For fastening the grinding wheels 18a, 18b, it can be provided that a nut 72 is screwed onto the end of the sliding sleeve 68 having the flange area 70.The sliding sleeves 68, together with the grinding discs 18a, 18b arranged thereon, are designed to be resiliently movable along the rotation axis 20. If a sliding sleeve 68 is deflected together with a grinding disc 18a, 18b, a restoring spring force 73a, 73b is exerted in the direction of the respective other grinding disc 18a, 18b. This ensures that both grinding discs 18a, 18b are pressed against a structure 14 to be cleaned.

[0071] In the embodiment shown, the drive shaft 24a is driven directly by the belt drive 22, while the drive shaft 24b is arranged on the drive shaft 24a in a torque-transmitting manner by means of a pin connection in the form of two bolts 74. In the view shown in Fig. 6, only one bolt 74 is visible.

[0072] The grinding wheels 18a, 18b form the receiving area 32. The receiving area 32 can have the receiving area width 36. The receiving area width 36 can be formed, as shown, at the radially outer end of the grinding wheels 18a, 18b. The receiving area 32 can have a roughing width 76. The receiving area 32 has the roughing width 76, preferably spaced radially from the outer edge of the grinding wheels 18a, 18b. Particularly preferably, the receiving area 32 is tapered in the radially inward direction of the grinding wheels 18a, 18b. In other words, the roughing width 76 of the receiving area 32 is typically smaller than the receiving area width 36. The receiving area 32 can form a so-called entry angle. As a result, the cleaning device 10 can be arranged particularly easily with little resistance due to the web-like structure 14 (see Fig. 1).Furthermore, the contamination 12 can be progressively removed with increasing penetration depth 42, whereby the force required for cleaning can be reduced and the handling of the cleaning device 10 can be facilitated.

[0073] Furthermore, the receiving area 32 can have a widening section adjacent to the tapered section. In this case, the section of the receiving area 32 having the roughing width 76 can represent the smallest spacing between the roughing discs 18a, 18b. With increasing penetration depth 42, an already cleaned section of the web-like structure 14 can be introduced into the widening section of the receiving area 32 without further contact with the roughing discs 18a, 18b. Further material removal can thus be effectively prevented.

[0074] Fig. 7 shows an alternative embodiment of a grinding wheel 18a, 18b.

[0075] The illustrated grinding disc 18a, 18b has five roughing projections 34 arranged on a grinding disc base body 78—here, each screwed on by means of a fastening screw 80. According to the embodiment shown, the roughing projections 34 are designed as blade strips 82. The blade strips 82 can each have a blade 84 arranged in a direction of rotation 26a, 26b. Preferably, the blade strips 82 have more than one blade 84, but at least two blades 84. The at least two blades 84 are preferably arranged on the grinding disc 18a, 18b in a different direction of rotation.

[0076] Fig. 8 shows a schematic representation of a cleaning method 100 according to the invention. In a method step 102, the web-like structure 14 (see Fig. 1) can first be provided.

[0077] In a subsequent method step 104, the cleaning device 10 (see Fig. 1) is arranged on the web-like structure 14. In other words, the cleaning device 10 is placed on the web-like structure 14 in such a way that the web-like structure 14 is arranged or positioned at least partially within the receiving area 32 (see Fig. 1) or between the grinding wheels 18a, 18b of the cleaning device 10.

[0078] In a further method step 106, the cleaning device 10 is moved along the web-like structure 14. The cleaning device 10 can be moved in the feed direction 28 (see Fig. 1) along the feed axis 30 (see Fig. 1).

[0079] The cleaning device 10 can be moved forward or backward along the web-like structure 14. In this case, the direction of rotation 26a, 26b (see Fig. 1) of the grinding discs 18a, 18b can be changed.

[0080] List of reference symbols

[0081] Cleaning device 10; Second spreading lever 50b;

[0082] Contamination 12; Storage location 52; Web-like structure 14; Spread angle 54;

[0083] Drive unit 16; protective cover 56, 58;

[0084] Grinding wheel 18a, 18b; web guide 60;

[0085] Rotation axis 20; guide rollers 62a, 62b;

[0086] Belt drive 22; guide roller pair 64a, 64b;

[0087] Drive shaft 24a, 24b; guide plate 66a, 66b;

[0088] Direction of rotation 26a, 26b; sliding sleeve 68;

[0089] Feed axis 30; flange area 70;

[0090] Feed direction 28; Nut 72;

[0091] Mounting area 32; spring force 73a, 73b

[0092] Roughing projections 34; bolts 74;

[0093] Mounting area width 36; roughing width 76;

[0094] Web width 38 of the web-like grinding disc base body 78;

[0095] Structure 14; Fixing screw 80;

[0096] Structural stop 40; blade bar 82;

[0097] Penetration depth 42; blade 84;

[0098] Spreading device 44; Cleaning method 100;

[0099] Lever system 46; process steps 102, 104, 106

[0100] Spreader plate 48; section AA.

[0101] First spreading lever 50a;

Claims

Patent claims Cleaning device (10) for removing impurities (12) from a web-like structure (14), comprising a drive unit (16) and two grinding discs (18a, 18b) which can be driven to rotate about a common axis of rotation (20); - wherein at least one grinding disc (18a, 18b) can be driven by the drive unit (16); - wherein the grinding discs (18a, 18b) form a receiving area (32) for the web-like structure (14) along the common axis of rotation (20); - wherein each grinding disc (18a, 18b) has a plurality of roughing projections (34) on a side facing the receiving area (32); - wherein the grinding discs (18a, 18b) are resiliently movable along the rotational axis (20) in order to cause the grinding discs (18a, 18b) to be pressed against the web-like structure (14) on both sides when arranged on the web-like structure (14). Cleaning device (10) according to claim 1, wherein the grinding discs (18a, 18b) are arranged parallel to one another. Cleaning device (10) according to claim 1 or 2, wherein the grinding discs (18a, 18b) form a tapered receiving region (32) in a radially inward direction, wherein the tapered receiving region (32) is followed by a widened receiving region (32). Cleaning device (10) according to one of the preceding claims, wherein the roughing projections (34) of at least one roughing disk (18a, 18b) are formed as a surface grain formed on the roughing disk (18a, 18b) or wherein the roughing projections (34) are formed as blade strips (82) arranged on the roughing disk (18a, 18b). Cleaning device (10) according to one of the preceding claims, comprising a structural stop (40) for limiting a penetration depth (42) in a penetration direction of the roughing disks (18a, 18b) into the web-like structure (14). Cleaning device (10) according to one of the preceding claims, wherein at least one of the roughing disks (18a, 18b) is driven by at least one belt drive (22). Cleaning device (10) according to one of the preceding claims, wherein a grinding disc (18a, 18b) is arranged on a respective drive shaft (24a, 24b).Cleaning device (10) according to one of the preceding claims, wherein the grinding discs (18a, 18b) have opposing directions of rotation (26a, 26b). Cleaning device (10) according to claim 7 or 8, comprising two drive units (16), wherein the grinding discs (18a, 18b) are each driven by one of the drive units (16). Cleaning device (10) according to one of the preceding claims, comprising a spreading device (44), wherein the spreading device (44) is designed to widen the receiving area (32). Cleaning device (10) according to claim 10, wherein the spreading device (44) is designed as a lever system (46). Cleaning device (10) according to one of the preceding claims, comprising a web guide (60), wherein the web guide (60) guides the cleaning device (10) parallel to the grinding discs (18a, 18b) in a feed direction (28) of the cleaning device (10).Cleaning device (10) according to claim 12, wherein the web guide (60) has four guide rollers (62a, 62b), wherein the guide rollers (62a, 62b) are arranged at right angles to the feed direction (28) and the rotation axis (20), and wherein two guide rollers (62a, 62b) are arranged upstream of the grinding discs (18a, 18b) in the feed direction (28) and two guide rollers (62a, 62b) are arranged downstream of the grinding discs (18a, 18b) in the feed direction (28), wherein the guide rollers (62a, 62b) protrude beyond the grinding discs (18a, 18b) in a penetration direction. Cleaning device (10) according to claim 12 or 13, comprising two parallel arranged guide plates (66a, 66b), wherein in each case an upstream guide roller (62a, 62b) and a downstream guide roller (62a, 62b) are connected by means of a guide plate (66a, 66b). A cleaning method (100) for removing contaminants (14) from a web-like structure (12), using a cleaning device (10) according to any one of the preceding claims, comprising the steps of: c) arranging (104) the web-like structure (14) between the grinding discs (18a, 18b); d) moving (106) the cleaning device (10) along the web-like structure (14).

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