Simple conveyor belt scraper system maintenance

Abstract

The present invention relates to a scraper system for a conveyor belt (12), a belt conveyor (10) including the scraper system, and a method for performing installation, testing, or maintenance work. The scraper system includes a system support (24) and at least one scraper module (26, 126) mounted on the system support (24), and includes a scraper element (42) for contacting the conveyor belt (12). To allow easy access to the components of the scraper system for installation, testing, or maintenance purposes, a mounting member (20) is provided for the system support (24), the mounting member including at least one attachment member (28) for fixed attachment relative to a conveyor belt frame (16) of the conveyor belt, a retaining element (30) for attaching the system support (24) to the attachment member (28), and a support element (80) located on the attachment member (28). A retaining element (30) is coupled to a system support (24) via a clamping assembly (50) to allow torque to be applied to the system support (24) about its longitudinal axis, and the retaining element (30) is releasably connected to an attachment member (28). In an operating arrangement, the retaining element (30) is connected to the attachment member (28) such that the system support (24) is held on the attachment member (28) via the retaining element (30), and in an installed arrangement, the retaining element (30) is released from the attachment member (28). The system support (24), together with the scraper modules (26, 126) and the retaining element (30), can be pulled away in the longitudinal direction of the system support (24) to a pull-out position such that the scraper modules (26, 126) pass through the attachment member (28) as they are pulled away from the system support (24). In the pull-out position, a support element (80) supports the system support (24).

Description

Technical Field

[0001] This invention relates to a scraper system for a conveyor belt, a belt conveyor having a scraper system, and a method for installing, testing, or maintaining the scraper system. Background Technology

[0002] Scraper systems are well-known for being used on belt conveyors to transport the most diverse range of conveyed goods. Most known scraper systems have a system carrier laterally aligned with the direction of belt travel, with multiple scraper modules containing scraper elements located on this system carrier. By positioning the scraper elements against the running conveyor belt, any conveyed goods adhering to the belt can be scraped off.

[0003] Various types and designs of scraper systems and scraper modules are known. For example, DE 102017 114931A1 illustrates a scraper system for placement in the deflection zone of the discharge pulley of a fast-moving belt conveyor. Scraper blocks made of elastic material are interchangeably fastened adjacent to each other to a spring-mounted system carrier arranged transversely to the direction of travel of the belt conveyor.

[0004] DE 20 2020 104 666U1 discloses a conveyor belt scraper, particularly a drum scraper, which has a plurality of scraping elements arranged adjacent to each other on a crossbeam. Each scraping element has a resilient base body and a retaining device for securing the scraping element to the crossbeam. The retaining device has two clamping members interlocked in a clamping manner, one of the clamping members being secured to a retaining element that can be fixed to the crossbeam, and the other of the clamping members being secured to the base body.

[0005] DE 10 2013 006 821A1 describes a belt scraper system comprising modules for a return zone of a conveyor. The system carrier is arranged transversely to the direction of travel of the conveyor belt. Multiple scraping modules are attached adjacent to each other to the system carrier. Each scraping module carries a scraping sheet that contacts the conveyor belt in a peeling manner.

[0006] During the operation of a scraper system, scraper components, such as scraper blades or scraper blocks, will experience significant wear and must be replaced periodically.

[0007] US 4,098,394 describes a mounting and support arrangement for a conveyor belt scraper. Multiple cleaning blades are secured to an arm on a cross shaft. A radial ratchet and pawl mechanism for rotating the cross shaft is located outside the housing to bias the blades against the conveyor belt. To repair or replace the blades, the cross shaft is removed by removing a coupling at one end and a sleeve at the opposite end. A mounting flange is removed from the sidewall, and the cross shaft with the scraper assembly is removed from the housing through an access door. Summary of the Invention

[0008] In the case of known scraper systems, accessing the scraper module required for maintenance can be difficult, especially when it is necessary to enter a hazardous area under the conveyor belt. Therefore, the following can be considered as an objective: to provide a scraper system, a belt conveyor with a scraper system, and a method for performing installation, testing, or maintenance work on the scraper system, which allows maintenance personnel to access the scraper module in a simple manner, thereby avoiding risks.

[0009] This objective is achieved by a scraper system for a conveyor belt according to one aspect of the invention, a belt conveyor according to another aspect of the invention, and a method according to another aspect of the invention. Other aspects of the invention relate to advantageous embodiments of the invention.

[0010] The inventors considered that working on a scraper system, particularly the installation, testing, or maintenance of the scraper module, is especially complex if it requires access to hazardous areas of a factory and thus necessitates safeguards such as mounting brackets or similar structures, as well as extended periods of operational interruption. Therefore, the possibility of performing maintenance on the scraper module from the outside of the conveyor belt area is of particular interest. To achieve this, the inventors propose a scraper system in which the system carrier having the scraper module (or at least one scraper module) can be pulled laterally away in the simplest possible manner.

[0011] The scraper system according to the invention includes a system carrier and at least one scraper module attached to the system carrier, preferably a plurality of scraper modules attached to the system carrier, each of which has a scraper element for abutting against the conveyor belt. The system carrier is arranged transversely to the conveyor belt. The system carrier is preferably constructed as a shaft that can rotate about a longitudinal axis or can be tensioned in the direction of rotation. In principle, the system carrier can have any cross-sectional shape, but preferably has a circular cross-section in at least some sections, and particularly preferably has a circular cross-section in at least two opposite end regions. In a preferred, particularly simple, embodiment, the system carrier is constructed as a continuous tube that preferably always has a constant circular cross-section.

[0012] The scraper module or multiple scraper modules are preferably detachably attached to the system carrier, and particularly preferably detachably secured to the system carrier in a clamping and holding device. Each scraper element can be a scraper block, for example, made of a flexible material, especially when the scraper is arranged as a pre-scraper, i.e., located in the deflection area of ​​the conveyor belt. The scraper element preferably has a scraping edge, which is particularly preferably made of metal, such as a hard metal (tungsten carbide). This allows for more preferably peeling contact with the conveyor belt, especially in the return area.

[0013] A retaining device is provided for attaching the system carrier to a belt conveyor. According to the invention, the retaining device includes: at least one attachment member for fixed attachment relative to a conveyor belt support of the conveyor belt; a retaining element for attaching the system carrier to the attachment member; and a support element located on the attachment member. In an operating arrangement, i.e., an arrangement in which the scraper system performs its function during conveyor belt operation, the retaining device having the attachment member, retaining element, and support element is preferably disposed in the end region of the system carrier, more preferably laterally disposed on the outside of the width of the conveyor belt. Opposing supports may be disposed on opposite sides, which may preferably have a simpler construction as explained in more detail below.

[0014] The attachment component may be part of the conveyor belt support, or may preferably be fixedly connected to the conveyor belt support. In a preferred embodiment, the attachment component may be plate-shaped, or may have at least one plate-shaped segment for retaining the attachment of the element.

[0015] According to the invention, the retaining element is connected to the system carrier via a tensioning device, by means of which the system carrier can be subjected to torque about its longitudinal axis. Due to this torque, the scraper element can preferably be pressed onto the conveyor belt. The tensioning device preferably acts between the retaining element and the system carrier, for example via an element, such as a tensioning arm, that is rotatably attached to the system carrier. The tensioning device may have: for example, a tensioning element, such as a pawl and ratchet; a tensioning screw and / or a spring element that has the function of applying torque between the retaining element and the system carrier.

[0016] According to the invention, the retaining element can be detachably connected to the attachment member. In the operating position, the retaining element is connected to the attachment member, and the system carrier is held on the attachment member via the retaining element. By separating the retaining element from the attachment member, the scraper system can be transferred from the operating position to an assembly arrangement in which the system carrier, having the scraper module and the retaining element, can be extracted into an extraction position along its longitudinal direction. When the system carrier is extracted along its longitudinal direction, the scraper module can pass through the attachment member (and preferably the support element). For this purpose, a free area of ​​sufficient size and suitable shape is preferably provided such that the scraper module or the scraper module and the retaining element can also pass through the attachment member and preferably the support element when the system carrier moves only in the longitudinal direction, i.e., preferably without movement in the lateral direction. This free area can be formed at least partially by a cutout on the support element. During or before extraction, starting from the operating position, in which the scraper element abuts against the conveyor belt, the system carrier, together with the scraper module attached thereto, can be rotated to a certain extent so that the protruding part can pass through the free area.

[0017] According to the invention, a support element can be provided to support the system carrier in the extraction position (and preferably continuously during the extraction process of the system carrier). The support element can preferably be fixed or detachably mounted on the attachment member; alternatively, the support element can be integrally constructed with the attachment member. The support element can be particularly preferably hook-shaped and at least partially surrounds the system carrier. Although the support element preferably does not have any contact with the system carrier in the operating position, it can take over the support of the system carrier immediately after the connection between the holding element and the attachment member is disengaged. Therefore, the weight of the system carrier and the scraper module does not need to be supported otherwise by manually holding or supporting them on a bracket or similar object to be specially attached.

[0018] The extraction system carrier along its longitudinal direction is preferably understood as a linear translational movement. During the transfer to the extraction position, the scraper module passes through the attachment member, i.e., the scraper module is in an operating position on the first inner side of the attachment member and in an extraction position on its opposite outer side.

[0019] Therefore, the scraper system according to the invention allows the system carrier to be laterally extracted into an extraction position, in which the scraper module is located outside the attachment member and can be easily accessed for installation, inspection, or maintenance purposes. The support element supports the system carrier so that it does not need to be held by the operator, reducing or eliminating the risk of the system carrier falling. The supporting effect of the support element can be understood as the action of a vertically upward force, meaning the system carrier can preferably rest on the support element.

[0020] Preferably, the support element does not support the system carrier until the retaining element has been separated from the attachment member, i.e., in the operating position, there is no direct contact between the support element and the system carrier, but a small distance remains, for example, at least 0.5 mm or 1 mm, preferably less than 5 cm, and particularly preferably less than 1 cm. After separating the retaining element from the attachment member, the side of the system carrier connected to the retaining element can preferably be lowered by this small amount until the side contacts the support element. This arrangement preferably results in only a small tilt of the system carrier, for example, less than 5°, and particularly preferably less than 1°, as long as the system carrier remains in the opposite opposing support device.

[0021] Therefore, the scraper system according to the invention can be easily maintained, and in particular, scraper modules or scraper elements can be easily replaced, without having to enter the area beneath the conveyor belt. The handling is particularly simplified by supporting the system carrier during or at the extraction position, and this operation can preferably be performed by one person.

[0022] For attaching fixed elements and attachment parts, various types of connections can be used, among which simple disassembly is preferred, but sufficient stability is required during operation. For example, a screw connection with one or more screws can be provided.

[0023] According to a further development of the invention, the retaining element is connected to the attachment member by means of a screw connection, which is combined with at least one plug-in connection, preferably two plug-in connections arranged at a certain distance from each other. One or more plug-in connections are preferably designed such that the plug-in connections are aligned along the longitudinal axis of the system carrier, so that the retaining element can be removed from the attachment member after the screw connection is released along the longitudinal direction of the system carrier. Bolts are preferably used as plug-in connections, and the bolts are received in receiving openings. Bolts are particularly preferably arranged on the attachment member, and receiving openings are arranged on the retaining element, although the reverse arrangement is also possible. The screw connection and the plug-in connections are preferably aligned parallel to each other. It is particularly preferred that only one screw is provided, arranged between two plug-in connections. Therefore, the operation can use a sufficiently secure connection that can be separated very quickly and easily.

[0024] Further developments provide that the support element partially surrounds the system carrier. For this purpose, the internal shape of the support element facing the system carrier can correspond to the contour of the system carrier at least in certain sections. For example, if the contour of the system carrier is circular, the internal shape of the support element can be partially circular. The support element can preferably have a recess in which the system carrier is partially received and thus supported and secured against lateral movement, particularly against falling. More preferably, the support element surrounds the system carrier on a first circumferential portion while leaving a second circumferential portion of the system carrier free, allowing the scraper module to pass through the support element when the system carrier is removed. The first circumferential portion of the system carrier surrounded by the support element can be, for example, at least 90° and up to 180°, preferably surrounding a circumferential area of ​​>115° and <155°. This ensures good support, minimizing the risk of the system carrier falling. On the other hand, excessively wide and, particularly, complete enclosure is undesirable, as it would allow the system carrier with the scraper module to still be removed. The shape of the support element is preferably adapted at least to the first circumferential portion of the outer contour of the system carrier; the system carrier is particularly preferably having a circular cross-section in at least some sections, and the support element is partially annular.

[0025] In a preferred embodiment, the attachment member is arranged vertically above the system carrier, and the support element extends vertically downward along the direction of the system carrier, such that the support element at least partially surrounds the system carrier. At least one section of the support element preferably surrounds the system carrier, such that the system carrier is arranged between the attachment member and the surrounding section of the support element, i.e., the surrounding section of the support element that preferably extends below the system carrier.

[0026] Preferably, a swivel bearing is provided between the retaining element and the system carrier, which allows at least slight rotation relative to each other, so as to preferably modify the arrangement and, in particular, the offset between the scraper element and the conveyor belt. The swivel bearing can be formed in various ways, preferably as a bearing bushing, and particularly preferably as a plastic bushing.

[0027] In a preferred embodiment, the retaining element is designed to be at least partially plate-shaped, and the system carrier passes through the retaining element, preferably perpendicular to it. Such an arrangement is structurally simple and enables stable fastening, particularly when the attachment parts and / or support elements are also plate-shaped and arranged on top of each other.

[0028] As previously described, a counter-support member is preferably provided for the retaining device, such that the system carrier is mounted in both the retaining device and the counter-support member. Similar to the (first) attachment member of the retaining device, a second attachment member is preferably provided for the counter-support member, arranged along the longitudinal direction of the system carrier at a distance from the first attachment member. The system carrier is preferably rotatably mounted on the second attachment member and displaceably mounted along the longitudinal direction of the second attachment member. For this purpose, a bearing sleeve for the system carrier can also preferably be provided on the second attachment member or on an element connected thereto, particularly preferably as a bearing bushing, for example, a bushing made of plastic. The counter-support member is preferably not locked along the longitudinal direction of the system carrier, so that the system carrier can be removed from the counter-support member after the support device is separated without taking other measures. Therefore, disassembly from only one side of the retaining device is possible without access to the counter-support member.

[0029] According to a preferred embodiment, an extraction aid can be provided for the system carrier, which can be attached to the system carrier such that the extraction aid extends along the longitudinal direction of the system carrier in an extension of the system carrier. Such an extraction aid can assist in grasping, guiding, or holding the system carrier during extraction. The extraction aid and / or the system carrier preferably have insertion openings at their ends, allowing the extraction aid and the system carrier to be inserted into each other. An insert, i.e., an adapter, for connecting the extraction aid to the system carrier can also be used. Such an adapter can, for example, have a clamping device for holding the system carrier and a connecting section for connecting the extraction aid. More preferably, a locking device can be provided for securing the extraction aid to the system carrier and / or the adapter, thereby preventing accidental removal.

[0030] As already explained, various types of scraper modules can be attached to the system carrier. According to a preferred embodiment, the scraper module (or preferably all scraper modules) has a module arm to which the scraper element is attached. This module arm is pivotable at the module connection, preferably about an axis that is at least substantially parallel to the longitudinal direction of the system carrier. This will be understood to mean that the alignment may also include a slightly tilted position or a slight rotation, preferably <30°, more preferably <20°, and particularly preferably <10°.

[0031] The scraper module preferably has a spring element to act torque on the module arm. Different types of spring elements are possible, with a rubber torsion spring being preferred. This spring element allows the scraper element to press against the conveyor belt. More preferably, the scraper module may have a stop for rotation of the module arm at the module joint to limit the pivoting movement of the scraper element in the conveyor belt direction. If a spring element is used, the stop is preferably arranged such that the spring acts on the module arm in the direction of the stop, wherein an offset still exists at the stop.

[0032] The belt conveyor can be equipped with a scraper system according to the invention, such that the scraper element abuts against the conveyor belt and the attachment component is fastened to the conveyor belt support.

[0033] Work can be performed on the scraper system according to the invention in a particularly simple manner, such as installation, testing or maintenance work, wherein, starting from the operating position, the retaining element is separated from the attachment parts, and the system carrier having the scraper module and the retaining element is extracted along the longitudinal direction of the system carrier, wherein, during the extraction of the system carrier, the support element supports the system carrier. Attached Figure Description

[0034] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, wherein:

[0035] Figure 1 , Figure 2 A perspective view of a portion of a belt conveyor having a conveyor belt and a scraper according to a first embodiment is shown;

[0036] Figure 1a It shows Figure 1 An enlarged perspective view of the holding device in the image;

[0037] Figure 3 It shows Figure 1 , Figure 2 Side view of the scraper in the middle;

[0038] Figure 4 , Figure 5 Shown in top view and partially cut side view Figures 1 to 3 The scraper module in the scraper;

[0039] Figure 6 It shows that line A passes through... Figure 5 Cross-section of the scraper module;

[0040] Figure 7 It shows Figure 4 , Figure 5 A perspective view of a scraper module in the image, which has separate scraper elements;

[0041] Figures 8a to 8e A perspective view is shown showing the various positions of the components of the scraper according to the first embodiment during the extraction of the system carrier; and

[0042] Figure 9a to Figure 9c A perspective view of the scraper according to the first embodiment is shown when using the extraction aid;

[0043] Figure 10 It shows along Figure 8b A cross-sectional view of line B...B;

[0044] Figure 11 A perspective view of a portion of a belt conveyor having a conveyor belt and a scraper according to a second embodiment is shown;

[0045] Figure 12 It shows Figure 11 A top view of the system carrier of the scraper in the middle;

[0046] Figure 13 It shows Figure 11 , Figure 12 Side view of the scraper in the middle;

[0047] Figure 14 It shows the relationship with Figure 10 Similarly, according to the second embodiment Figures 11 to 13 A view of the scraper in the image. Detailed Implementation

[0048] Figure 1 and Figure 2 A perspective view of a portion of a belt conveyor 10 according to a first embodiment, having a conveyor belt 12 that deflects around a deflection drum 14, is shown. The shaft of the deflection drum is mounted on a conveyor belt support 16, which is only partially depicted here.

[0049] On the belt conveyor 10, the scraper 18, which has multiple scraper modules 26, is provided with a system carrier 24 and a retaining device 20 and an opposing support 22 for attachment to the conveyor belt support 16.

[0050] The retaining device 20 and the opposing support 22 each have an attachment member, which in their respective cases is in the form of an attachment plate 28 fastened to or as part of the conveyor belt support 16. The retaining element in the form of a retaining plate 30 is attached to the attachment plate 28 in their respective cases.

[0051] In the illustrated embodiment, the system carrier 24 is a tube with a constant circular cross-section. Each retaining plate 30 has a circular recess into which a plastic sliding bushing 33 is inserted, and the system carrier 24 is rotatably mounted.

[0052] exist Figure 3 The side view depicts two scraper modules 26. Each scraper module 26 includes a base element 32, which is detachably attached to the system carrier 24 in a clamping and holding device 34. A scraper arm 36 is pivotally attached to the base element 32 about a pivot axis 38. A scraper element holder 40 having a scraper element 42 is arranged at the end of the scraper arm 36 in each case.

[0053] For example from Figure 2 As can be observed, multiple scraper modules 26 are arranged adjacent to each other on the system carrier 24. The system carrier 24 extends along the width direction of the conveyor belt 12, that is, it extends transversely to the running direction of the conveyor belt 12. In the case of the first embodiment, the scraper modules 26 arranged adjacent to each other each have alternating shorter and longer scraper arms 36, such that the scraper elements 42 are arranged in two staggered rows, wherein, viewed along the running direction of the conveyor belt, the scraper elements 42 of the two rows constantly provide a slight overlap. The scraper modules 26 are positioned adjacent to each other such that the two rows extend at least substantially over the entire width of the conveyor belt 12.

[0054] like Figure 3 As shown in the example illustrated in the return zone of conveyor belt 12, during operation of belt conveyor 10 and scraper 18, the scraping edge of scraper element 42 contacts the surface of conveyor belt 12 in a peeling manner. Scraper element 42 presses against the surface of conveyor belt 12 in an elastic manner. Therefore, contaminants and adhered conveyed goods are scraped off from the operating conveyor belt 12 by scraper element 42.

[0055] exist Figure 4 , Figure 5 The present invention describes in more detail one of the plurality of scraper modules 26. As shown herein, a connection 44 is provided between the base element 32 and the scraper arm 36, such that the scraper arm 36 can pivot about a pivot axis 38. As depicted, the connection 44 includes a stirrup 46 that surrounds the base element 32.

[0056] A rubber torsion spring (not depicted) that applies torque to the scraper arm 36 functions inside the connection 44.

[0057] A protruding convex portion is provided on the base element 32 as a stop portion 48. In the stop position, a portion of the stirrup member 46 abuts against the stop portion 48, preventing the wiper arm 36 from pivoting further about the pivot axis 38. A rubber torsion spring is configured to act on the wiper arm 36 in the direction of the stop portion, wherein, in Figure 5 The stop position described in the text contains a spring biasing element 48.

[0058] Due to the action of the springs in each of the scraper modules 26, the scraper element 42 presses against the surface of the conveyor belt 12. However, during operation, under the influence of corresponding forces, such as damage, elevation, or similar situations to the stationary conveyor belt on the surface of the conveyor belt 12, the scraper element 42 can pivot in the connection 44 by the scraper arm 36 moving around the pivot axis 38 against the action of the spring, thereby taking an avoidance action.

[0059] The bias of the entire scraper 18—the entire scraper element 42 pressing against the conveyor belt 12 by this bias—is predetermined by specifying the rotational position of the system carrier 24. For this purpose, a tensioning device 50 is provided on the holding device 20 between the holding plate 30 and the system carrier 24.

[0060] Figure 1a The retaining device 20 is shown in an enlarged view. The clamping ring attached to the system carrier 24 has a tensioning arm 54 projecting radially from the system carrier 24. This tensioning arm 54 can be tensioned relative to the attachment fixedly attached to the retaining plate 30 by means of a tensioning screw 56. By adjusting the tensioning screw 56, the system carrier 24 can thus be rotated, and the bias of the spring in the scraper module 26 can be set.

[0061] As in Figure 1 , Figure 1a As further shown in the illustration, in the illustrated embodiment, the plate-shaped support element 80, arranged between the attachment plate 28 and the retaining plate 30, is also attached to the attachment plate 28 of the retaining device 20. The following discusses... Figures 8a to 8d as well as Figure 10 The shape and function of the support element 80 will be explained in more detail.

[0062] During the operation of the scraper 18, the continuous wear of the scraper element 42 necessitates regular inspection and maintenance. The scraper 18 is designed to be maintained in a particularly simple manner in terms of its attachment to the conveyor belt support 16 and in terms of the attachment of the scraper element 42 to the scraper module 26.

[0063] For example, especially from Figure 4 , Figure 5 and Figure 7 It is evident that the scraper arm 36 includes two elements detachably fastened to each other: a shaft 58 attached to the scraper element holder 40 and a sleeve 60 connected to the base element 32, i.e., a stirrup 46 fastened to the connecting portion 44. The shaft 58 is inserted into the sleeve 60. Figure 5 And it is fixed along the longitudinal axis 64 of the scraper arm 36 by means of the torsion lock 62.

[0064] As from Figure 2 and Figure 3 It is evident that, in the illustrated embodiment, the longitudinal axis 64 extends parallel to the running direction of the conveyor belt 12 in the vertical view, and is therefore also perpendicular to the longitudinal axis of the system carrier 24, i.e., at an angle β of 90° (see [reference]). Figure 8e In a horizontal view from the side ( Figure 3 In this embodiment, the longitudinal axis 64 extends at an angle γ of approximately 9° to the running direction of the conveyor belt 12. In the illustrated embodiment, the longitudinal axis 64 is also aligned perpendicularly to the contact edge of the scraper element 42, i.e., at an angle of 90° (see [reference]). Figure 4 ).

[0065] Shaft 58 can rotate freely inside sleeve 60 about longitudinal axis 64, which is why longitudinal axis 64 is also called axis of rotation. However, a sealing ring 66 is provided. On the one hand, the sealing ring 66 seals the internal space of sleeve 60 relative to shaft 58. On the other hand, due to friction generated from contact with the inner side of sleeve 60, the movement of shaft 58 relative to sleeve 60 is somewhat sluggish.

[0066] The twist lock 62 includes an elongated window 62a disposed inside the sleeve 60 on one side, the window 62a having an edge protruding into the interior of the sleeve 60, and the twist lock 62 includes an elongated plate-shaped engaging element 62b on one side of the shaft 58, the engaging element 62b being fixedly attached at the end of the shaft 58 to an extension 63 having a smaller diameter.

[0067] For example, especially from Figure 6 As clearly shown in the cross-sectional view, the joining element 62b and the window portion 62a are configured such that when the joining element 62b is aligned parallel to the window portion 62a (shown by dashed lines), it can be inserted through the window portion 62a along the direction of the longitudinal axis 64. At the same time, the joining element 62b is locked in a torsional position with parallel alignment (shown by solid lines) relative to the edge of the window portion 62a.

[0068] Therefore, as far as the shaft 58 is fixed to the sleeve 60 in the axial direction along the longitudinal axis 64, this creates a dependence on the rotational position.

[0069] In the position of the engaging element 62b parallel to the window portion 62a (indicated by dashed lines), the shaft 58 is located within the release angle range 68a, and the shaft 58 has a scraper element holder 40 and a scraper element 42 attached thereto. In the rotational position within the release angle range, the torsion lock 62 is released, and the shaft 58 can be freely displaced in the longitudinal direction relative to the sleeve 60.

[0070] As the shaft 58 is further twisted relative to the sleeve 60, the end of the engaging element 62b engages behind the edge of the window portion 62a, thereby fixing the shaft 58 relative to the sleeve 60 in the longitudinal direction. The corresponding rotational position of the shaft 58 is within a fixed angle range 68b, within which the torsion lock 62 is locked.

[0071] As depicted, the release angle range is 68°. Figure 6 The rotational position shown by the dashed line is centered, where the front edge of the scraper element 42, positioned to abut against the conveyor belt 12, is located at a position 90° to the longitudinal direction of the system carrier 24 and to the pivot axis 38 of the scraper module 26. In contrast, the fixed angle range 68b is centered on a rotational position that is 90° rotated relative to this position, and... Figure 6 The image is shown in solid lines. In this rotational position, the scraping edge of the scraper element 42 is parallel to the longitudinal direction of the system carrier 24 and aligned with the pivot axis 38 of the connecting portion 44.

[0072] Due to the free rotation of shaft 58 within sleeve 60, each scraper element 42 can align itself according to the contour of conveyor belt 12 during contact with it. In practice, this is not consistently flat across the entire width of the conveyor belt, but may bend, for example, toward the edges. Due to the contact pressure, scraper element retainer 40 always self-adjusts so that scraper element 42 follows the shape of conveyor belt 12.

[0073] However, a rotational position within the release angle range 68a cannot be achieved in any operating position. Therefore, during the contact between the scraper element 42 and the conveyor belt 12, the torsion lock 62 is constantly maintained within a fixed angle range, thus ensuring the fastening of the base element 32 of each scraper module 26.

[0074] The following text is about Figures 8a to 8eAs explained, in order to operate on the scraper 18 and the scraper module 26, and especially in order to replace the unit including the scraper element 42, the scraper element holder 40 and the shaft 26, the system carrier 42 to which the scraper module 26 is attached can be separated in a particularly simple manner and extracted laterally.

[0075] Therefore, a special attachment member for the retaining plate 30 and the attachment plate 28 is provided on the side of the retaining device 20, and a bearing for the system carrier 24 is provided in the bearing bushing 33 of the retaining plate 30 on the side of the opposing support member 22, so that the system carrier 24 can move freely in its longitudinal direction.

[0076] like Figure 1a As depicted, the retaining plate 30 is secured to the attachment plate 28 of the retaining device 20 by two plug-in connections 70 and one screw connection 72. The plug-in connections 70 are formed by two bolts arranged parallel to each other at a certain distance on the attachment plate 28, which are precisely received and fitted into holes in the retaining plate 30. The plug-in connections 70 can be removed from the attachment plate 28 by removing the retaining plate 30 along the longitudinal direction of the system carrier 24.

[0077] The screw connection 72 formed between the plug-in connections 70 includes a screw aligned parallel to the bolt, by which the retaining plate 30 is screwed to the attachment plate 28.

[0078] In the operating position for operating the belt conveyor 10 and the scraper 18, the retaining plate 30 is fixed to the attachment plate 28 by means of screw connection 72.

[0079] If operation is interrupted, the component to be maintained of the scraper 18 can be removed by moving the scraper 18 to the assembly arrangement. By loosening the screw connection 72, the retaining plate 30 can be detached from the attachment plate 28 by subsequently separating the plug connections 70a, 70b by pulling along the longitudinal axis of the system carrier 24. A handle 74 is provided for this purpose.

[0080] Figure 8a As shown, starting from the operating position, the screw connection 72 is released first. Subsequently, the retaining plate 30, together with the system carrier 24, is pulled off the attachment plate 28 along its longitudinal direction, wherein the plug-in connections 70a and 70b are separated.

[0081] As already mentioned, the fixing device 20 between the attachment plate 28 and the retaining plate 30 includes a support element 80. (As from...) Figure 8bIt is evident that the support element 80 has a hook-shaped retaining section 82 extending along the direction of the system carrier 24 and partially surrounding the system carrier 24, the hook-shaped retaining section being configured with a recess 86. As shown, the retaining section 82 and the recess 86 have, in some sections, an inner contour corresponding to the (in this case, circular) outer contour of the system carrier 24. The retaining section 82 is arranged in an operating position, i.e., when the retaining plate 30 is fastened to the attachment plate 28 such that the retaining plate 30 does not contact the system carrier 24, but is held at a distance of a few millimeters. Above the retaining section 82, the support element 80 has a cutout 84 through which the system carrier 24 passes.

[0082] In the assembly arrangement, that is, after releasing the screw connection 72 and the plug-in connections 70a and 70b ( Figure 8b The system carrier 24 is slightly lowered and then rests in the recess 86 on the retaining section 82 of the support element 80. After the connection between the retaining plate 30 and the attachment plate 28 is separated, the support element 80 thus takes over the retention of the system carrier 24. As depicted, the support element 80 is fastened to the attachment plate 28, and therefore to the conveyor belt bracket 16. Figure 10 As depicted, the retaining section 82 surrounds the system support 24 on a circumferential region α of approximately 135° at the recess 86 and supports the system support 24 from below, so that the system support 24 will not fall off.

[0083] In the further process, the system support 24, together with the retaining plate 30 and the tensioning device 50, is now pulled away along its longitudinal axis. Figure 8b During this process, the support element 82 supports the system carrier 24, preventing the system carrier 24 from falling off. Due to the displacement of the system carrier 24 within the bearing bushing 33 of the opposing support 22, it can be pulled away particularly easily.

[0084] The scraper module 26 can pass through the attachment plate 28 and the support element 80 because the hook-shaped form of the retaining section 82—which only partially surrounds the system carrier 24 using the cutout 84—leaves sufficient free space so that the scraper module 26 can be transferred to an extraction position outside the conveyor belt area when the system carrier 24 is pulled away. Figure 8d Therefore, the scraper module 26 can be guided through the free region in the plane of the support element 80 and the attachment plate 28 without impact. The cutout 84 of the support element 80 forms part of the free region.

[0085] In the extraction position, the scraper module 26 is easily accessible and can be inspected and maintained. In particular, worn scraper elements 42 can be replaced by separating the corresponding units made of the scraper elements 42, scraper element holders 40 and shafts 58 of the respective scraper modules as described above, which are separated by twisting the respective components about the axis of rotation 64, removing the respective components in the longitudinal direction, and then attaching new elements in the same manner.

[0086] Therefore, the process of inspecting and maintaining the scraper 18 becomes particularly easy. In the illustrated embodiment, the system carrier 24, together with the scraper module 26, can be pulled laterally away by loosening only a single screw (screw connection 72). This can be done by one person thanks to the support provided by the support element 80.

[0087] If sufficient space exists on one side of the conveyor belt 12, the handling of the system carrier 24 can be made even easier when it is pulled away using the extraction aid. For this purpose, as shown in Figure 9a, the adapter 76 can first be laterally fitted onto the system carrier 24 and clamped or otherwise secured to it. A tube can then be attached to the adapter 76, which serves as the extraction aid 78 and is attached to an extension of the system carrier 24. The system carrier 24 can be handled particularly well by means of the extraction aid 78, especially in cases relating to the support on the holding section 82 of the support element 80.

[0088] According to the second embodiment, the scraper 118 is in Figures 11 to 14 The scraper 118 according to the second embodiment corresponds to the scraper 18 according to the first embodiment in many details, such that only the differences will be explained in more detail below, and reference will be made to the above description in other respects. The same reference numerals denote corresponding elements between the embodiments.

[0089] However, in the case of the scraper 18 according to the first embodiment as described and depicted, the scraper elements 42 are arranged in two rows, while the scraper 118 according to the second embodiment includes a single row arrangement of scraper elements 42 located on scraper modules 126, each having the same length and arranged adjacent to each other on the system carrier 24.

[0090] As from Figure 12It is evident that the scraping edge of the scraper element 42 is not aligned with the transverse direction of the conveyor belt 12 as in the first embodiment, but rather inclined at an angle to the transverse direction of the conveyor belt 12, which is approximately 15° in the depicted example. However, the scraper arm 36 extends its longitudinal axis 64 along the longitudinal direction of the conveyor belt 12 as in the first embodiment, i.e., at an angle β of 90° as in the first embodiment.

[0091] The scraper element 42 is attached to the scraper arm 36 at an angle of approximately 75° δ. Adjacent scraper modules 126 on the system carrier 24 are arranged closely together such that, when viewed along the longitudinal direction of the conveyor belt 12, the scraper elements 42 appear to slightly overlap, thus producing a scraping effect across the entire width of the conveyor belt.

[0092] In other respects, the scraper 118 according to the second embodiment is identical in construction and function to the scraper 18 according to the first embodiment. That is, like the scraper 18, each scraper 118 includes: a base element 32 detachably attached to the system carrier 24 in a clamping and holding device 34; and a scraper arm 36 pivotally attached about a pivot axis 38, with a scraper element holder 40 having a scraper element 42 arranged at each end of the scraper arm 36. A biased torsion spring generates torque such that during operation of the scraper 118, the scraping edge of the scraper element 42 contacts the surface 12 of the conveyor belt 12 in a peeling manner and elastically presses against the surface 12 of the conveyor belt 12 to scrape off contaminants. If there is a stationary obstacle on the surface of the conveyor belt 12, the scraper element 42 can take an avoidance action because the scraper arm 36 resists the action of the spring to pivot about the pivot axis 38.

[0093] Regarding the second implementation method, Figure 13 A horizontal view from the side is shown, from which the angle γ between the running direction of the conveyor belt 12 and the longitudinal axis 64 can be observed. Depending on the arrangement and settings, this angle γ can be, for example, between 0° and 20°; in the embodiment shown, the angle γ is approximately 15°.

[0094] Similarly, in the second embodiment, the scraper arm 36 includes a shaft 58 attached to the scraper element holder 40, which is inserted into the sleeve 60 and can rotate about a longitudinal axis 64 in the sleeve 60. A torsion lock 62 ensures that the shaft 58 can only be pulled out of the sleeve 60 or inserted into the sleeve 60 at a corresponding alignment point, i.e., rotated from the normal position defined by the conveyor belt contact portion 60.

Claims

1. A scraper system for a conveyor belt (12), the scraper system comprising: -System carrier (24), - At least one scraper module (26, 126) attached to the system carrier, the scraper module (26, 126) having a scraper element (42) for abutting against the conveyor belt (12), - A retaining device (20) for the system carrier (24), the retaining device (20) having at least one attachment member (28) for fixed attachment relative to the conveyor belt support (16) of the conveyor belt (12), a retaining element (30) for attaching the system carrier (24) to the attachment member (28), and a support element (80) located on the attachment member (28). -The retaining element (30) is connected to the system carrier (24) via a tensioning device (50), by means of which the system carrier (24) can be subjected to a torque about the longitudinal axis of the system carrier (24). -and among them, The retaining element (30) is detachably connected to the attachment member (28), such that In the operating position, the retaining element (30) is connected to the attachment member (28), and the system carrier (24) is held on the attachment member (28) via the retaining element (30). -And in the assembly arrangement, the retaining element (30) and the attachment part (28) Separation, the system carrier (24) having the scraper module (26, 126) and the retaining element (30) can be extracted in the extraction position along the longitudinal direction of the system carrier (24), such that when the system carrier (24) is extracted, the scraper module (26, 126) passes through the attachment member (28). -In the extraction position, the support element (80) supports the system carrier (24).

2. The scraper system according to claim 1, wherein The retaining element (30) is connected to the attachment member (28) by means of a screw connection (72) and at least one plug-in connection (70). -in, The plug-in connection (70) is aligned along the longitudinal axis of the system carrier (24) such that the retaining element (30) can be pulled away from the attachment member (28) after the screw connection (72) is released along the longitudinal direction.

3. The scraper system according to claim 1 or 2, wherein -The support element (80) grips the system carrier (24) via the first circumferential portion of the system carrier (24). -The support element (80) allows the second circumferential portion of the system carrier (24) to be in a free state, so that the scraper module (26, 126) can pass through the support element (80) when the system carrier (24) is displaced.

4. The scraper system according to claim 1 or 2, wherein -The attachment component (28) is arranged above the system carrier (24). - and the support element (80) at least surrounds the system carrier (24) such that the system carrier (24) is arranged between the attachment member (28) and a portion of the support element (80).

5. The scraper system according to claim 1 or 2, wherein A rotary bearing is provided between the retaining element (30) and the system carrier (24).

6. The scraper system according to claim 1 or 2, wherein -The retaining element (30) has at least a partially plate-like configuration. - and the system carrier (24) passes through the retaining element.

7. The scraper system according to claim 1 or 2, wherein -The attachment component (28) is the first attachment component. - And a second attachment member is provided on the opposing support member (22), the second attachment member being arranged along the longitudinal direction of the system support member (24) at a certain distance from the first attachment member. -in, The system carrier (24) is mounted in a displaceable manner relative to the second attachment member along the longitudinal direction of the system carrier (24).

8. The scraper system according to claim 1 or 2, wherein - The extraction aid (78) can be attached to the system carrier (24) such that the extraction aid (78) extends in the extension of the system carrier (24) along the longitudinal direction of the system carrier (24).

9. The scraper system according to claim 1 or 2, wherein - The scraper module (26, 126) has a scraper arm (36), to which the scraper element (42) is attached. -in, The scraper arm (36) is pivotable in the module connection (44) about a pivot axis (38) which is at least substantially parallel to the longitudinal direction of the system carrier (24).

10. The scraper system of claim 9, wherein - The scraper module (26, 126) has a spring element so as to act on the scraper arm (36) with torque.

11. The scraper system according to claim 1 or 2, wherein in the scraper system - The scraper module (26, 126) is attached to the system carrier (24) in the clamping and holding device (34).

12. A belt conveyor (10), comprising: - A conveyor belt support (16) and a conveyor belt (12), wherein the conveyor belt (12) is circumferentially attached to the conveyor belt support (16). -The scraper system (18) according to any one of claims 1 to 11, -The system carrier (24) is arranged transversely to the conveyor belt (12). -The scraper element (42) abuts against the conveyor belt (12), -and among them, The attachment component (28) is fastened to the conveyor belt support (16) or is part of the conveyor belt support (16).

13. A method for performing installation, testing, or maintenance work on a scraper system according to any one of claims 1 to 11 or a belt conveyor according to claim 12, wherein in the method -Starting from the operating position, the retaining element (30) separates from the attachment member (28). - and the system carrier (24) having the scraper module (26, 126) and the retaining element (30) is extracted along the longitudinal direction of the system carrier (24). -in, During the extraction of the system carrier, the support element (80) supports the system carrier.

14. The method according to claim 13, wherein in the method - In the operating position, the retaining element (30) is connected to the attachment member (28) by means of a screw connection (72) and at least one plug-in connection (70), wherein, The plug-in connection (70) is aligned along the longitudinal axis of the system carrier (24). - and by releasing the screw connection (72), the retaining element (30) is separated from the attachment member (28). - And the plug-in connection is separated by removing the attachment component along the longitudinal direction.

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