Scraper with easily replaceable scraper elements

Abstract

The invention relates to a scraper (18) for a conveyor belt (12), a scraper module (26, 126) for the scraper, a belt conveyor (10) comprising the scraper, and a method for replacing a scraper element (42) on a scraper (18) or a belt conveyor (10). The scraper (18) according to the invention comprises a system support (24) comprising at least one scraper module (26, 126). The scraper module (26, 126) comprises a base element (32) arranged on the system support (24) and a scraper element (42) for contacting the conveyor belt (12). In order to allow particularly simple replacement of the scraper element (42), the scraper element (42) is rotatably attached relative to the base element (32) about an axis of rotation (64) by means of a rotary coupling. The rotary coupling is designed such that in a rotatable position of the scraper element (42) within a fixed angle range (68b), the scraper element (42) is rigidly coupled to the base element (32) in the direction of the rotation axis (64), and in a rotatable position of the scraper element (42) within a release angle range (68a), the scraper element (42) can be released from the base element (32) in the direction (20) of the rotation axis (64).

Description

Technical Field

[0001] The invention relates to a scraper for a conveyor belt, a scraper module for a scraper, a belt conveyor equipped with a scraper, and a method for replacing a scraper element. Background Art

[0002] The use of scrapers is well known, as conveyor belts of belt conveyors are used to transport a wide variety of conveyed goods. By placing scraper elements against the running conveyor belt, any conveyed goods adhering to the conveyor belt can be scraped off. Known scraper systems have a system carrier aligned transversely to the direction of travel of the conveyor belt, on which a plurality of scraper modules with scraper elements are located.

[0003] DE 10 2013 006 821 A1 describes a belt scraper system consisting of modules for the return area of ​​a conveyor belt. The system carrier is arranged transversely to the direction of travel of the conveyor belt. Multiple scraper modules are attached to the system carrier adjacent to one another. Each scraper module carries a scraper blade that comes into contact with the conveyor belt in a peeling manner.

[0004] WO 95 / 19310 describes a device for scraping contaminants off a conveyor belt in a conveyor belt system. The system carrier is fastened to a bearing frame for a belt conveyor. A scraper element having a scraper blade fastened to a lamella support is arranged so that, in its operating position, the scraper element bears against the belt conveyor in a peeling manner. The scraper element has a torsion spring connection on which the lamella support is guided in a pivoting and spring-loaded manner about a horizontal pivot axis, so that if the scraper element encounters an obstacle firmly adhering to the belt conveyor, the scraper element can be pivoted away and then pivoted back into the operating position. The lamella support is pivotally mounted by means of a rotary bearing with a limited rotation angle, so that the scraper blade bearing against the conveyor belt webbing can adapt to the contour of the conveyor belt webbing by automatically rotating. Summary of the Invention

[0005] The scraper elements that bear against the conveyor belt during operation are subject to considerable wear during operation and must be regularly changed and replaced. It can be seen as an object to propose a scraper, a scraper module for a scraper, a belt conveyor having a scraper, and a method for replacing a scraper element on a scraper, which method allows a simple replacement of the scraper element.

[0006] This object is achieved by a scraper according to one aspect of the invention, a scraper module for a scraper according to another aspect of the invention, a belt conveyor according to another aspect of the invention and a method according to another aspect of the invention. Further aspects of the invention relate to advantageous embodiments of the invention.

[0007] The scraper according to the present invention has at least one scraper module, preferably a plurality of scraper modules, on a system carrier. Each scraper module comprises at least one base element arranged on the system carrier and a scraper element arranged to contact the conveyor belt. The scraper element can be, for example, a scraping block made of a flexible material, in particular when the scraper is arranged as a pre-scraper, i.e. for arrangement in the deflection area of ​​the conveyor belt. The scraper can preferably be arranged in the return area of ​​the conveyor belt. The scraper element more preferably has a scraping edge, particularly preferably a scraping edge made of metal, such as carbide. The scraper element can preferably rest against the conveyor belt in a peeling manner.

[0008] The base element of the wiper module can be attached to the system carrier in various ways and is preferably detachable. Particularly preferably, it is mounted to the system carrier by means of a clamping holding device.

[0009] According to the invention, the scraper element is attached relative to the base element by means of a rotational coupling, such that the scraper element can rotate about the rotational axis. The rotational coupling is designed such that, depending on the rotational position of the scraper element relative to the rotational axis, different couplings result: in a rotational position within an angular range referred to herein as the fixed angular range, the scraper element is firmly coupled to the rest of the scraper module, i.e., in particular, to the base element, with respect to movements in the direction of the rotational axis, whereas in a rotational position within an angular range referred to herein as the released angular range, the scraper element can be separated from the rest of the scraper module, i.e., in particular, from the base element, in the direction of the rotational axis.

[0010] The rotary coupling thus ensures rotatability of the scraper element about the axis of rotation so that it can be aligned relative to the conveyor belt surface, whereby during operation the scraper element has good contact with the conveyor belt and can follow the - for example slightly sagging - shape of the conveyor belt.

[0011] The rotary coupling further ensures a fixed coupling within a fixed angular range - with respect to longitudinal movements in the direction of the rotation axis, i.e., in rotational positions within the fixed angular range, the scraper element can indeed rotate, but cannot be separated from the base element. During the rotation of the scraper element, the scraper element is brought into a rotational position within the release angular range. In contrast, the rotary coupling releases the scraper element so that it can be separated, preferably pulled away in the direction of the rotation axis - for example, for maintenance purposes.

[0012] The fixed angle range and the release angle range can preferably be selected so that during operation, i.e. when the scraper element is against the conveyor belt, the scraper element is always within the fixed angle range and is at a sufficient distance from the release angle range so that the latter cannot be reached with sufficient certainty during operation, i.e. the scraper element is prevented from rotating into the release angle range by contact with the conveyor belt. For example, the fixed angle range can be selected so that the horizontal alignment of the scraper element or the alignment of the scraper element parallel to the system carrier is within the fixed angle range, preferably at least substantially centered. This position can be assumed to be an intermediate position, wherein the fixed angle range extends from the intermediate position, preferably at least over + / - 30°, more preferably at least over + / - 40°, and particularly preferably at least over + / - 60°. Therefore, the release angle range particularly preferably only begins at a strong twist around the axis of rotation, for example 90°+ / - 20°, so that a secure connection is always ensured in all operating positions that are generally expected.

[0013] On the other hand, for maintenance purposes, the scraper element can be detached from the base element in a particularly simple manner and thus also from the system carrier by simply rotating the scraper element about the rotation axis until the release angle range is reached. The scraper element can then be pulled away, preferably in the direction of the rotation axis, without having to release other connections.

[0014] Thus, a scraper is produced which has an easily replaceable scraper element that can be realized with a very simple design. The rotatability about the axis of rotation is used twice: firstly, to align the scraper element during operation, and secondly, to separate it if it is to be replaced. The scraper element can preferably be rotated manually without tools.

[0015] In order to replace, i.e., to replace a worn scraper element with a new one, it is sufficient to rotate the old scraper element into the release angle range (for this purpose, it may be necessary to previously bring the system carrier into a position in which the scraper element is at a sufficient distance from the conveyor belt to enable this rotation). The scraper element can then be separated from the base element, and the new scraper element, which is positioned in the rotational position within the release angle range, can be attached to the base element, for example inserted into the base element, and can thereafter be rotated into a rotational position within the fixed angle range for locking.

[0016] The rotary coupling can be implemented in various ways to achieve the functionality according to the invention. According to a preferred embodiment, the rotary coupling comprises an engagement element and an insertion opening for the engagement element, which is configured such that the engagement element can be guided through the insertion opening in a first rotational position within a release angle range and can be locked to the insertion opening in a second rotational position within a fixed angle range. The insertion opening and its edge can be part of the base element or attached to the base element, and the engagement element can be arranged on the side of the scraper element, or vice versa.

[0017] The engaging element can particularly preferably be arranged on a shaft that can be inserted into the insert sleeve, wherein the insert opening is formed in the insert sleeve. The edge of the insert opening can be configured to protrude inwardly into the insert sleeve. The shaft is preferably connected to the scraper element, for example, firmly and immovably attached relative to the scraper element, and the insert sleeve is fixed to the base element. The rotatability of the scraper element is preferably ensured by the rotatability of the shaft in the insert sleeve. Preferably, the shaft and / or the insert sleeve and particularly preferably the axis of rotation can also extend at least substantially perpendicular to the scraping edge of the scraper element, or at least extend at an angle δ exceeding 45 °, preferably 60 ° or greater.

[0018] The axis of rotation is also preferably arranged at least substantially perpendicular to the system carrier, or at least at an angle β exceeding 60°. Thus, when viewed from above or below, the axis of rotation preferably extends at least substantially parallel to the direction of travel of the conveyor belt. When viewed from the side, i.e., horizontally and transversely to the direction of travel of the conveyor belt, the axis of rotation can enclose a relatively small angle γ of, for example, 0° to 35° with the direction of travel of the conveyor belt in a preferred embodiment. However, alternative advantageous embodiments are also conceivable in which the axis of rotation is positioned at a relatively steep angle, i.e., at a larger angle γ, relative to the direction of travel of the conveyor belt.

[0019] According to a preferred embodiment, the rotation of the scraper element around the axis of rotation is slightly damped or provided with a deliberate hysteresis, so that free rotation cannot be achieved during, for example, the influence of gravity alone on the scraper element. In contrast, the rotary coupling operates so smoothly that free rotation and alignment of the scraper element are possible during the influence of forces generated by the scraper element in contact with the conveyor belt. Due to the targeted damping or hysteresis, the installation of the scraper element is facilitated, since the desired alignment of the scraper element can thus be predetermined, for example by manual rotation, without being altered in an undesirable manner. In the case of a preferred configuration of the rotary coupling with a shaft that can be inserted into an insert sleeve, damping can be achieved, for example, by means of a friction element, which is arranged to contact the interior of the shaft and / or the insert sleeve in order to damp the relative movement, in particular the rotation, between the shaft and the insert sleeve.

[0020] Furthermore, in the preferred embodiment of a rotary coupling comprising a shaft and an insert sleeve, a sealing element may be provided for sealing between the shaft and the interior of the insert sleeve to prevent the penetration of contaminants. The sealing element may preferably completely surround the shaft, for example as an O-ring. In particular, the sealing element may also be used to achieve a desired damping of the relative movement between the shaft and the insert sleeve.

[0021] According to a further development of the invention, the scraper module can have a connection part, by means of which the scraper element can be pivoted relative to the system carrier. The pivot axis of the connection part can preferably be aligned at least substantially parallel to the system carrier. It is further preferred that the pivot axis of the connection part is at least substantially perpendicular to the rotation axis of the rotary coupling part or at least forms an angle of at least 60° to the rotation axis of the rotary coupling part. By making the scraper element pivot in the connection part, a variable contact with the conveyor belt can preferably be achieved; it is particularly preferred that the scraper element can be pivoted away from the conveyor belt surface by the pivoting movement in the connection part in order to allow obstacles to pass.

[0022] A spring element can preferably be provided to apply pressure to the scraper element in the direction of the conveyor belt. This allows for elastic contact of the scraper element with the conveyor belt. Essentially, any type of spring element can be used for this purpose, such as a torsion spring, a helical spring, a tension or compression spring, etc. A rubber torsion spring, preferably arranged in the connecting portion, is particularly preferred.

[0023] According to an advantageous embodiment, a stop is provided for the pivoting movement of the scraper element in the joint. Thus, the movement of the scraper element in the direction of the conveyor belt can be limited. The stop is preferably positioned such that, in the stop position, there is still a bias in the direction of the conveyor belt surface.

[0024] The wiper element can preferably be connected to the joint via a wiper arm, wherein the rotational coupling is formed on the wiper arm.

[0025] A wiper module according to another aspect of the invention is provided as a part of the described wiper and comprises at least a base element, a wiper element and a rotational coupling.

[0026] When the scraper is deployed on a belt conveyor according to another aspect of the invention, the system carrier is aligned transversely to the conveyor belt and the scraper element, or preferably a plurality of scraper elements, bears against the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Embodiments of the present invention are described in more detail below with reference to the accompanying drawings, in which:

[0028] Figure 1 、 Figure 2 shows a perspective view of a portion of a belt conveyor having a conveyor belt and a scraper according to a first embodiment;

[0029] Figure 1a Shown Figure 1 An enlarged perspective view of the holding device in FIG;

[0030] Figure 3 Shown Figure 1 、 Figure 2 A side view of the scraper in FIG.

[0031] Figure 4 、 Figure 5 Shown in top view and partially cut-away side view Figures 1 to 3 The scraper module of the scraper in ;

[0032] Figure 6 Shown along line A..A passing through Figure 5 Cross section of a scraper module;

[0033] Figure 7 Shown Figure 4 、 Figure 5 A perspective view of a scraper module in FIG. 1 , wherein the scraper module has separated scraper elements;

[0034] Figures 8a to 8e a perspective view showing various positions of the components of the scraper according to the first embodiment during extraction of the system carrier; and

[0035] Figures 9a to 9c shows a perspective view of the scraper according to the first embodiment when using an extraction aid;

[0036] Figure 10 Shown along Figure 8bA cross-sectional view of line B...B;

[0037] Figure 11 shows a perspective view of a portion of a belt conveyor having a conveyor belt and a scraper according to a second embodiment;

[0038] Figure 12 Shown Figure 11 A top view of a system carrier of a scraper in FIG.

[0039] Figure 13 Shown Figure 11 、 Figure 12 A side view of the scraper in FIG.

[0040] Figure 14 Shown with Figure 10 Similarly, according to the second embodiment Figures 11 to 13 A view of the scraper in . DETAILED DESCRIPTION

[0041] Figure 1 and Figure 2 A perspective view of a portion of a belt conveyor 10 of a first embodiment is shown with a conveyor belt 12 which deflects around a discharge pulley 14. The shaft of the discharge pulley is mounted on a conveyor belt support 16, only parts of which are shown schematically here.

[0042] On the belt conveyor 10 , a scraper 18 having a plurality of scraper modules 26 is provided with a system carrier 24 and holding devices 20 and counter supports 22 for attachment to the conveyor belt support 16 .

[0043] The holding device 20 and the counter support 22 each have an attachment member, here in each case in the form of an attachment plate 28, which is fastened to or is part of the conveyor belt support 16. A holding element in the form of a holding plate 30 is attached to the attachment plate 28 in each case.

[0044] In the embodiment shown, the system carrier 24 is a tube with a continuous circular cross section. The retaining plates 30 each have a circular recess into which a plastic sliding bushing 33 is inserted, in which recess the system carrier 24 is rotatably mounted.

[0045] exist Figure 3 , two wiper modules 26 are depicted in a side view. The wiper modules 26 each comprise a base element 32, which is detachably attached to the system carrier 24 in a clamping holder 34. A wiper arm 36 is attached to the base element 32 so as to be pivotable about a pivot axis 38. A wiper element holder 40 with a wiper element 42 is arranged at the end of each wiper arm 36.

[0046] For example, from Figure 2 As can be seen in the figure, a plurality of scraper modules 26 are arranged adjacent to one another on the system carrier 24. The system carrier 24 extends in the width direction of the conveyor belt 12, that is, transversely to the direction of travel of the conveyor belt 12. In the first embodiment, the scraper modules 26 arranged adjacent to one another each have alternating shorter and longer scraper arms 36, so that the scraper elements 42 are arranged in two staggered rows, wherein, viewed in the direction of travel of the conveyor belt, a slight overlap is constantly provided between the scraper elements 42 of the two rows. The scraper modules 26 are positioned adjacent to one another so that the two rows extend at least substantially over the entire width of the conveyor belt 12.

[0047] In such Figure 3 As shown in the example shown in the return area of ​​the conveyor belt 12, during operation of the belt conveyor 10 and the scraper 18, the edges of the scraper elements 42 bear against the surface of the conveyor belt 12 in a peeling manner. The scraper elements 42 are elastically pressed against the surface of the conveyor belt 12. As a result, contaminants and adhering conveyed goods are scraped off the running conveyor belt 12 by the scraper elements 42.

[0048] exist Figure 4 、 Figure 5 , one of the plurality of wiper modules 26 is described in greater detail. As shown therein, a connection 44 is provided between the base element 32 and the wiper arm 36 so that the wiper arm 36 can pivot about the pivot axis 38. As depicted, the connection 44 includes a stirrup 46 that surrounds the base element 32.

[0049] A rubber torsion spring (not depicted) acts in the interior of the joint 44 , applying torque to the wiper arm 36 .

[0050] A protruding projection is provided on the base element 32 as a stop 48. In the stop position, a portion of the stirrup 46 rests against the stop 48, so that the wiper arm 36 cannot pivot further about the pivot axis 38. The rubber torsion spring is configured such that it acts on the wiper arm 36 in the direction of the stop, wherein in the stop position Figure 5 There is a spring bias 48 in the stop position described in FIG.

[0051] Due to the action of the respective springs of the scraper modules 26, the scraper elements 42 are pressed against the surface of the conveyor belt 12, but during operation under the influence of corresponding forces, for example due to damage, lifting or similar situations of the stationary conveyor belt on the surface of the conveyor belt 12, the scraper elements 42 can pivot in the connecting part 44 by performing a corresponding pivot axis movement about the pivot axis 38 due to the scraper arms 36 resisting the action of the springs and thus take evasive action.

[0052] The offset of the entire scraper 18 by which the entire scraper element 42 is pressed against the conveyor belt 12 is predetermined by presetting 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.

[0053] Figure 1a The holding 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, which can be tensioned relative to the attachment firmly attached to the holding plate 30 by means of a tensioning screw 56. By adjusting the tensioning screw 56, the system carrier 24 can be rotated and the bias of the spring of the wiper module 26 can be adjusted.

[0054] As in Figure 1 、 Figure 1a As further shown in FIG, the plate-shaped supporting element 80 arranged between the attachment plate 28 and the holding plate 30 in the embodiment shown is additionally attached to the attachment plate 28 of the holding device 20. Figures 8a to 8d as well as Figure 10 The shape and function of the support element 80 are explained in more detail.

[0055] During operation of the scraper 18, continuous wear on the scraper elements 42 necessitates regular inspection and maintenance. The scraper 18 is designed to be particularly easy to maintain in terms of its attachment to the conveyor belt support 16 and in terms of the attachment of the scraper elements 42 to the scraper module 26.

[0056] Especially from Figure 4 、 Figure 5 and Figure 7 As is evident from the drawing, the wiper arm 36 comprises two elements fastened to each other in a detachable manner, namely a shaft 58 attached to the wiper element holder 40 and a sleeve 60 connected to the base element 32, i.e. fastened to the stirrup 46 of the coupling 44. The shaft 58 is inserted into the sleeve 60 ( Figure 5 ) and is fixed in the direction of the axis of rotation 64 of the wiper arm 36 by means of a twist lock 62.

[0057] As from Figure 2 and Figure 3 It is clear that in the embodiment shown, the axis of rotation 64 extends parallel to the running direction of the conveyor belt 12 in a 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 Figure 8e ). In the horizontal view from the side ( Figure 3), the rotation axis 64 extends at an angle γ of approximately 9° to the running direction of the conveyor belt 12. In the embodiment shown, the rotation axis 64 is also aligned perpendicularly, i.e. at an angle of 90°, to the contact edge of the scraper element 42 (see Figure 4 ).

[0058] The shaft 58 can rotate freely within the sleeve 60 about the rotation axis 64, which is why the rotation axis 64 is also referred to as the rotation axis. However, a sealing ring 66 is provided. On the one hand, the sealing ring 66 seals the interior space of the sleeve 60 relative to the shaft 58. On the other hand, the sealing ring 66 generates friction due to contact with the inner side of the sleeve 60, which causes a certain hysteresis in the movement of the shaft 58 relative to the sleeve 60.

[0059] The twist lock 62 comprises, on one side of the sleeve 60, an elongated insertion opening 62a arranged in the interior, the insertion opening 62a having a rim protruding into the interior of the sleeve 60, and comprises, on one side of the shaft 58, an elongated plate-like engaging element 62b which is securely attached to the end of the shaft 58 on an extension 63 having a smaller diameter.

[0060] Especially from Figure 6 It is apparent from the cross-sectional view in that the coupling element 62b and the insertion opening 62a are formed so that the coupling element 62b can be inserted through the insertion opening 62a in the direction of the rotation axis 64 when aligned parallel to the insertion opening 62a (indicated by the dotted line), and at the same time, the coupling element 62b is locked in a twisted position relative to the parallel alignment at the edge of the insertion opening 62a as shown (solid line).

[0061] Therefore, there is a dependency on the rotational position in terms of the fixing of the shaft 58 to the sleeve 60 in the axial direction of the rotational axis 64 .

[0062] In the position of the engagement element 62b parallel to the insertion opening 62a (indicated by the dashed line), the shaft 58, which has the scraper element 42 and the scraper element holder 40 attached thereto, is located in a position within the release angle range 68a. In the rotational position within the release angle range, the twist lock 62 is released and the shaft 58 can be freely displaced in the longitudinal direction relative to the sleeve 60.

[0063] When the shaft 58 is further twisted relative to the sleeve 60, the end of the engagement element 62b engages behind the edge of the insertion opening 62a, thereby fixing the shaft 58 in the longitudinal direction relative to the sleeve 60. The corresponding rotational position of the shaft 58 is within the fixed angular range 68b, and the twist lock 62 is locked within this fixed angular range 68b.

[0064] As depicted, the release angle range 68a is Figure 6The center is the rotational position shown by the dashed line, in which the front edge of the scraper element 42 arranged for contact with the conveyor belt 12 is 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 the rotational position that is rotated 90° therefrom and Figure 6 In this rotational position, the edge of the scraper element 42 is aligned parallel to the longitudinal direction of the system carrier 24 and parallel to the pivot axis 38 of the joint 44 .

[0065] Due to the free rotation of the shaft 58 inside the sleeve 60, each scraper element 42 can align itself according to the contour of the conveyor belt 12 during contact with the conveyor belt 12. In practice, this is not constantly flat across the entire conveyor belt width, but may be curved, for example, towards the edges. Due to the contact pressure, the scraper element holder 40 is always positioned so that the scraper element 42 follows the shape of the conveyor belt 12.

[0066] However, a rotational position within the release angle range 68a cannot be achieved in any operating situation. Therefore, during the contact of the scraper element 42 with the conveyor belt 12, the twist lock 62 is constantly kept in a fixed angle range and thus ensures the fastening of the base element 32 of each scraper module 26.

[0067] As follows about Figures 8a to 8e As explained, in order to be able to work on the scraper 18 and the scraper module 26, in particular to be able to change the unit comprising the scraper element 42, the scraper element holder 40 and the shaft 26, the system carrier 42 with the scraper module 26 attached can be separated in a particularly simple manner and extracted laterally.

[0068] Therefore, a special attachment of the retaining plate 30 to the attachment plate 28 is provided on the side of the retaining device 20, and on the side of the counter-support 22, a bearing of the system carrier 24 is provided in the bearing bushing 33 of the retaining plate 30, so that the latter can move freely in its longitudinal direction.

[0069] like Figure 1a , the holding plate 30 is fixed to the attachment plate 28 of the holding device 20 by means of two plug-in connections 70 and a screw connection 72. The plug-in connection 70 is formed by two bolts arranged parallel to each other at a distance from each other on the attachment plate 28, which are received in such a way that they fit precisely in holes in the holding plate 30. The plug-in connection 70 can be detached by pulling the holding plate 30 away from the attachment plate 28 in the longitudinal direction of the system carrier 24.

[0070] The screw connection 72 formed between the plug-in connections 70 comprises a screw aligned parallel to the bolt, with which the retaining plate 30 is screwed to the attachment plate 28 .

[0071] In an operating arrangement for operating the belt conveyor 10 and the scraper 18 , the retaining plate 30 is fixed to the attachment plate 28 by means of a screw connection 72 .

[0072] If the operation is interrupted, the part of the scraper 18 to be maintained can be removed by transferring the scraper 18 to the assembly arrangement. By releasing the screw connection 72, the holding plate 30 can be separated from the attachment plate 28 and then the plug-in connections 70a, 70b can be separated by pulling in the longitudinal axis direction of the system carrier 24. A handle 74 is provided for this purpose.

[0073] Figure 8a It is shown that, starting from the operational arrangement, first the screw connection 72 is released. Subsequently, the retaining plate 30 together with the system carrier 24 is removed from the attachment plate 28 in its longitudinal direction, wherein the plug-in connections 70a, 70b are separated.

[0074] As already mentioned, the fixing device 20 between the attachment plate 28 and the retaining plate 30 comprises a support element 80. Figure 8b It is evident that the support element 80 has a hook-shaped retaining portion 82 which extends in the direction of the system carrier 24 and partially surrounds the system carrier 24, the hook-shaped retaining section being configured with a recess 86. As shown, the retaining portion 82 and the recess 86 have, in certain sections, an inner contour which corresponds to the (in this case circular) outer contour of the system carrier 24. The retaining portion 82 is arranged in an operating arrangement, i.e. if the retaining plate 30 is fastened to the attachment plate 28, the retaining plate 30 does not touch the system carrier 24, but is held at a certain distance of a few millimeters therefrom. Above the retaining portion 82, the support element 80 has a cutout 84 through which the system carrier 24 passes.

[0075] In the assembled arrangement, ie after separation of the screw connection 72 and the plug-in connections 70a, 70b ( Figure 8b ), the system carrier 24 sinks slightly and thereafter rests in the recess 86 on the holding portion 82 of the support element 80. After the connection between the holding plate 30 and the attachment plate 28 is separated, the support element 80 thus takes over the holding of the system carrier 24. As depicted, the support element 80 is fastened to the attachment plate 28 and thus to the conveyor belt support 16. Figure 10 As depicted in FIG, the holding portion 82 surrounds the system carrier 24 over a circumferential region α of approximately 135° at the recess 86 and supports the system carrier 24 from below so that the system carrier 24 cannot fall.

[0076] In the further process, the system carrier 24 is now pulled away together with the retaining plate 30 and the tensioning device 50 in the direction of its longitudinal axis ( Figure 8b During this process, the support element 82 supports the system support 24 so that it does not fall out. Due to the displaceability of the system support 24 in the bearing bushing 33 of the counter support 22, it can be pulled away particularly easily.

[0077] The scraper module 26 can pass through the attachment plate 28 and the support element 80 because the hook-shaped form of the holding portion 82, which only partially surrounds the system carrier 24 with the cutout 84, leaves sufficient free space so that the scraper module 26 can be transferred into a removal position outside the conveyor belt area when the system carrier 24 is pulled away. Figure 8d ). The wiper module 26 can thus be guided through the free region in the plane of the support element 80 and the attachment plate 28 without being struck. The cutout 84 of the support element 80 forms part of the free region.

[0078] In the extraction position, the wiper module 26 is easily accessible and can be inspected and maintained. In particular, a worn wiper element 42 can be replaced by separating the respective units made up of the wiper element 42, the wiper element holder 40 and the shaft 58 of the respective wiper module as described above, by twisting the respective components about the rotation axis 64, pulling the respective components apart in the longitudinal direction, and then by attaching a new element in the same manner.

[0079] This makes it particularly easy to inspect and maintain the wiper 18. In the embodiment shown, the system carrier 24 together with the wiper module 26 can be pulled apart laterally by releasing only a single screw (screw connection 72). This can be done by one person due to the support provided by the support element 80.

[0080] If there is enough space on one side of the conveyor belt 12, the handling of the system carrier 24 can be made even easier when the system carrier 24 is pulled away by using a removal aid. Figure 9a , the adapter 76 can first be fitted laterally onto the system carrier 24 and clamped to the system carrier 24 or otherwise secured thereto. A tube can then be attached to the adapter 76, which tube serves as an extraction aid 78 and is attached in extension of the system carrier 24. With the aid of the extraction aid 78, the system carrier 24 can be handled particularly well, in particular in connection with the support on the holding portion 82 of the support element 80.

[0081] The scraper 118 according to the second embodiment is Figures 11 to 14 The scraper 118 according to the second embodiment corresponds in many details to the scraper 18 according to the first embodiment, so that only the differences are explained in more detail below and, otherwise, reference is made to the above description. The same reference numerals denote corresponding elements between the various embodiments.

[0082] 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, the scraper 118 according to the second embodiment comprises a single row arrangement of scraper elements 42 located on scraper modules 126, which each have the same length and are arranged adjacent to each other on the system carrier 24.

[0083] As from Figure 12 It is evident that the scraping edge of the scraper element 42 is not aligned in the transverse direction of the conveyor belt 12 as in the case of the first embodiment, but is inclined at an angle, which in the example depicted is approximately 15°, to the transverse direction of the conveyor belt 12. However, the scraper arm 36 extends with its axis of rotation 64 in the longitudinal direction of the conveyor belt 12 as in the case of the first embodiment, i.e. at an angle β of 90° as in the case of the first embodiment.

[0084] The scraper elements 42 are attached to the scraper arms 36 at an angle δ of approximately 75°. Adjacent scraper modules 126 on the system carrier 24 are arranged so closely that, viewed in the longitudinal direction of the conveyor belt 12, the scraper elements 42 slightly overlap, thereby producing a scraping effect across the entire conveyor belt width.

[0085] In other respects, the scrapers 118 according to the second embodiment are identical in structure and function to the scrapers 18 according to the first embodiment, i.e., like the scrapers 18, each scraper 118 comprises a base element 32, which is detachably attached to the system carrier 24 in a clamping holder 34, and a scraper arm 36, which is pivotally attached about a pivot axis 38 and at each end of which a scraper element holder 40 with a scraper element 42 is arranged. The biased torsion spring generates a torque such that, during operation of the scraper 118, the scraping edges of the scraper elements 42 bear against the surface 12 of the conveyor belt 12 in a peeling manner and are elastically pressed against the surface 12 of the conveyor belt 12 in order to scrape off contaminants. If a stationary obstacle is present on the surface of the conveyor belt 12 , the wiper element 42 can take evasive action due to the wiper arm 36 pivoting about the pivot axis 38 against the action of the spring.

[0086] For the second embodiment, Figure 13 A horizontal view from the side is shown, in which the angle γ between the running direction of the conveyor belt 12 and the axis of rotation 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, it is approximately 15°.

[0087] In the second embodiment as well, the wiper arm 36 comprises a shaft 58 which is attached to the wiper element holder 40 and which is inserted into a sleeve 60 and can be rotated about an axis of rotation 64 in the sleeve 60. By means of a twist lock 62 it is ensured that the shaft 58 can only be pulled out of the sleeve 60 or inserted into the sleeve 60 in a corresponding alignment, i.e. rotated from the normal position defined by the conveyor belt contact portion 60.

Claims

1. A scraper for a conveyor belt, comprising: a system carrier (24) having at least one wiper module (26, 126), -in, The scraper module (26, 126) has a base element (32) arranged on the system carrier (24) and a scraper element (42) for abutting against the conveyor belt (12), - wherein the scraper element (42) is rotatably attached relative to the base element (32) about a rotation axis (64) by means of a rotational coupling, - in a rotational position of the scraper element (42) within a fixed angular range (68b), the scraper element (42) is firmly coupled to the base element (32) in the direction of the rotational axis (64), - and in a rotational position of the scraper element (42) which lies within a release angle range (68a), the scraper element (42) can be separated from the base element (32) in the direction of the rotational axis (64).

2. The scraper according to claim 1, wherein -The rotary coupling has an insertion opening (62a) and an engagement element (62b), the insertion opening (62a) and the engagement element (62b) being configured such that the engagement element (62b) in a rotational position within the release angle range (68a) can be guided through the insertion opening (62a), and the engagement element (62b) is locked to the insertion opening (62a) in a rotational position within the fixed angle range (68b).

3. The scraper according to claim 2, wherein The engagement element (62b) is arranged on a shaft (58) which can be inserted into an insertion sleeve (60), wherein The insertion opening (62a) is formed in the insertion sleeve (60), - wherein the edge of the insertion opening (62a) is configured to protrude inwardly into the insertion sleeve (60).

4. The scraper according to claim 3, wherein The shaft (58) or the insert sleeve (60) is firmly connected to the scraper element (42).

5. The scraper according to any one of the preceding claims 1 to 4, wherein The axis of rotation (64) has an angle (β) greater than 60° relative to the system carrier (24).

6. The scraper according to any one of the preceding claims 1 to 4, wherein The fixed angular range (68b) extends from the middle position over at least + / - 30°.

7. The scraper according to any one of the preceding claims 1 to 2, wherein - the rotary coupling has a shaft (58) which can be inserted into an insertion sleeve (60), -in, A friction element is provided for abutting against the interior of the shaft (58) and / or the insert sleeve (60) in order to damp relative movement of the shaft (58) and the insert sleeve (60) against each other.

8. The scraper according to any one of the preceding claims 1 to 2, wherein - the rotary coupling has a shaft (58) which can be inserted into an insertion sleeve (60), -in, A sealing element (66) is provided for sealing between the shaft (58) and the interior of the insert sleeve (60).

9. The scraper according to any one of the preceding claims 1 to 4, wherein - the wiper module (26, 126) has a connecting portion (44), wherein The scraper element (42) is pivotable relative to the system carrier (24) in the joint.

10. The scraper according to claim 9, wherein - A spring element is provided in order to act on the scraper element (42) in the direction of the conveyor belt (12).

11. The scraper according to claim 9, wherein - the wiper element (42) is connected to the link (44) via a wiper arm (36), -in, The rotary coupling is formed on the wiper arm (36).

12. The scraper according to claim 9, wherein A stop (48) is provided for the pivoting movement of the scraper element (42).

13. The scraper according to claim 5, wherein the rotation axis (64) is arranged at least substantially vertically.

14. A wiper module for a wiper according to any one of the preceding claims 1 to 13, the wiper module (26, 126) having: - a base element (32) and a scraper element (42), wherein The scraper element (42) is rotatably attached relative to the base element (32) about a rotation axis (64) by a rotation coupling, - wherein the rotary coupling is configured such that - in a rotational position of the scraper element (42) situated within a fixed angular range (68b), the scraper element (42) is securely coupled to the base element (32) relative to a movement in the direction of the rotation axis (64), - and in a rotational position of the scraper element (42) which lies within a release angle range (68a), the scraper element (42) can be separated from the base element (32) in the direction of the rotational axis (64).

15. A belt conveyor comprising: - a conveyor belt (12), - and a scraper (18, 118) according to any one of claims 1 to 13, -in, The system carrier (24) is aligned transversely to the conveyor belt (12), - and the scraper element (42) bears against the conveyor belt.

16. A method for replacing scraper elements on a scraper according to any one of claims 1 to 13 or on a belt conveyor according to claim 15, in which method: - the system carrier (24) is brought into a position in which the scraper element (42) is at a sufficient distance from the conveyor belt (12) so that the scraper element (42) can be rotated into a rotational position within the release angle range (68a), - the scraper element (42) is separated from the base element (32), A new scraper element (42) positioned in a rotational position within the release angle range (68a) is attached to the base element (32) and rotated into a rotational position within the fixed angle range (68b).

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