Scraper blade element for a floor milling machine blade, floor milling machine with a scraper blade and method for operating a scraper blade of a floor milling machine

Abstract

The invention relates to a scraper blade element for a scraper plate of a soil tiller, a soil tiller with a scraper plate, and a method for operating a scraper plate of a soil tiller. The scraper blade element can be positioned on a support plate of the scraper plate in a first and a second operating position.

Description

[0001] The invention relates to a scraper blade element for a scraper shield of a soil milling machine, a soil milling machine with a scraper shield, and a method for operating a scraper shield of a soil milling machine.

[0002] Soil milling machines, such as road milling machines, recyclers, stabilizers, or surface miners, are frequently used in road and path construction or in open-pit mining. They typically have a machine frame, a driver's platform, various drive systems such as tracks and / or wheels, and a drive system comprising, for example, one or more drive motors. The drive motor(s) can be, in particular, one or more internal combustion engines, especially diesel engines, and / or one or more electric motors, which provide the drive energy required for the movement and operation of the soil milling machine.

[0003] These types of soil milling machines are used to mill, and sometimes remove, a surface layer of a subsoil, such as an asphalt surface. For this purpose, the soil milling machine may include a milling drum mounted rotatably within a milling drum housing. During operation, the milling drum engages the subsoil to a specific depth, milling it away. The milling drum may, for example, comprise a hollow cylinder with numerous cutting tools arranged on its outer surface. The milled material, which accumulates inside the milling drum housing, can often be conveyed via a discharge conveyor, either in or against the direction of travel, to a transport vehicle for removal. The rear wall of the milling drum housing, in the direction of travel of the soil milling machine, is frequently designed as a height-adjustable scraper with a scraper plate.Soil milling machines with such scraper devices are known, for example, from DE 102012012607 A1. The scraper device comprises a support plate on the lower edge of which several scraper strip elements are arranged interchangeably. The support plate may have an upper plate, which can be pivoted relative to the milling drum housing, for example, and a lower plate that is adjustable to the upper plate. The lower plate is then the part of the plate that carries the scraper strip elements or on which the scraper strip element(s) are directly mounted. During milling or working operation of the soil milling machine, the scraper device can be guided along the surface of the milled bed in a scraping motion, thus preventing, for example, milled material from exiting the interior of the milling drum housing to the rear (viewed in the working direction of the soil milling machine) and remaining on the milled bed.

[0004] DE102017116757A1 discloses a scraper strip with cutting elements whose cutting edges are not parallel to the longitudinal axis, at least in some areas. DE202010008045U1 discloses a scraper strip with a base part having an undercut that forms a socket for a plug-in extension of a shear element. DE102014007907A1 discloses an arrangement in which, in addition to a fixing device, a separate positive locking device with positive locking elements on the scraper strip element and on the support plate is provided on the at least one scraper strip element and the support plate, wherein the positive locking elements at least partially interlock complementarily and at least partially prevent displacement of the at least one scraper strip element on the support plate, in particular also in the longitudinal direction, i.e., in the direction of the horizontal width of the scraper device transverse to the working direction of the soil milling machine.

[0005] Starting from this, the object of the invention is to provide a way to further optimize the operation of a wiper shield with a support shield and at least one wiper strip element.

[0006] The problem is solved by a scraper blade element for a scraper plate of a soil tiller, by a soil tiller with a scraper plate, and by a method for operating a scraper plate of a soil tiller according to the independent claims. Preferred embodiments are specified in the dependent claims.

[0007] In a first aspect, the invention relates to a scraper strip element for a scraper plate of a soil milling machine. When used as intended, the scraper strip element is designed and configured to be mounted on a support plate of a soil milling machine and to slide or scrape along the milling bed during operation. The scraper strip element can therefore be, in particular, a replaceable part that can be exchanged for the support plate. It is understood that several scraper strip elements, especially those of identical construction, can be combined on the support plate of the soil milling machine to provide overall protection, particularly for the lower edge of the scraper plate and especially for the support plate itself.The wiper strip elements can also be used as side protection for the support plate, provided that the support plate is designed to accommodate them.

[0008] Part of the wiper blade element is a base component. This can be, for example, a forged part, possibly with post-processing. The base component forms the essential supporting structure of the wiper blade element itself and carries several bottom contact elements. These bottom contact elements are elements that, when the wiper blade element is used as intended, contact the surface of the milling bed and scrape along it during milling or machining operations. Therefore, the bottom contact elements can preferably be made of a material that is harder and thus more wear-resistant than the base component. This can be, for example, a cemented carbide material, in particular a metal matrix composite, such as a tungsten carbide-cobalt cemented carbide. Additionally or alternatively, polycrystalline diamonds (PCDs) can also be used. polycrystalline diamonds ) or, in particular, thermally stable polycrystalline diamonds (TSP) or boron nitride. The base part ultimately connects the bottom contact elements to the support plate. For this purpose, the bottom contact elements can, for example, be firmly connected to the base part via a soldered connection. It is preferred if the wiper strip element consists solely of the base part and the bottom contact elements, optionally together with the corresponding soldered connection.

[0009] The wiper blade element as a whole comprises a contact surface formed, in particular exclusively, by the base part, a front surface opposite the contact surface, and side flanks connecting the front surface to the contact surface. The front surface is, in particular, the outer surface of the wiper blade element that faces forward in the working or milling direction when the wiper blade element is used as intended. The contact surface of the wiper blade element, on the other hand, is, in particular, the outer surface of the wiper blade element that faces backward in the working or milling direction when the wiper blade element is used as intended, thus facing opposite the front surface, and which, preferably at least to a significant extent, rests against the support plate, in particular directly and immediately, when the wiper blade element is used as intended.The side flanks, on the other hand, refer to the side walls of the wiper strip element, or those outer surfaces of the wiper strip element via which the outer surfaces of the front and rear surfaces are connected. While the outer surfaces of the front and rear surfaces can thus lie, at least to a significant extent, in planes parallel to each other, the surfaces of the side flanks ideally extend, at least to a significant extent, in planes that are at an angle to the outer surfaces of the front and / or rear surfaces. It is understood that neither the front nor the rear surface nor the side flanks necessarily have to be completely planar in a single plane and / or be completely planar.The above information preferably relates to information for orientation and for defining and naming individual sides of the wiper strip element, which is essentially cuboid in shape overall.

[0010] The side flanks can consist of two longitudinal side flanks extending in a longitudinal direction of the scraper strip element and two short side flanks connecting the two longitudinal side flanks at their ends. The longitudinal direction of the scraper strip element refers in particular to its extension when used as intended, along a lower edge of the support plate or horizontally perpendicular to the working or milling direction of the soil milling machine. Additionally or alternatively, the longitudinal direction of the scraper strip element thus refers to the longitudinal axis of the surface obtained when the front face of the scraper strip element is projected onto a virtual projection plane such that its area is maximized. This surface can, in particular, be at least substantially rectangular.The longitudinal extent of the scraper strip element corresponds to its longitudinal extent in the direction of the parallel longitudinal extents of the two scraper strips. In this representation, the longitudinal extent of the scraper strip element corresponds to the length of this rectangle (not the diagonal), and the lateral extent of the scraper strip element corresponds to the height of this rectangle. Additionally or alternatively, the longitudinal extent of the scraper strip element can be in the direction of and parallel to the outer edges of the two scraper strips, particularly in the projection of the scraper strip element onto this virtual projection plane described above. The extent of the longitudinal side flanks, particularly in the aforementioned projection plane, is preferably greater than the extent of the short side flanks, in particular by a factor of four or more.

[0011] The scraper blade element also includes one or more fastening elements or fastening element receptacles, which, when the scraper blade element is used as intended, serve to attach the scraper blade element to the scraper plate or the support plate of the scraper plate of the soil milling machine, possibly using additional fastening elements and / or fastening element receptacles. The fastening elements of the scraper blade element may, for example, be screw bolts permanently connected to the base part. The fastening element receptacles may, for example, be one or more openings, including through-openings, for inserting or passing a fastening screw or similar fastening element. The openings may or may not have an internal thread.The fastening elements and / or fastening element receptacles of the wiper strip element are designed and configured to be part of a detachable fastening or detachable fastening device of the wiper strip element to the support plate.

[0012] The scraper strip element has a first scraper strip and a second scraper strip along its longitudinal edges that define its front surface in the longitudinal direction. The first and second scraper strips are specifically areas of the scraper strip element that, when used as intended, form the lower vertical edge of its front surface and can, in particular, come into direct contact with the milling bed and slide along it. The first and second scraper strips are preferably formed exclusively by the bottom contact elements.

[0013] The first scraper strip extends along a first longitudinal edge of the base part, where the front of the scraper strip element and one of its two longitudinal side flanks meet. The second scraper strip extends along a second longitudinal edge of the base part, where the front of the scraper strip element and the other of its two longitudinal side flanks meet. The scraper strip element thus comprises a total of two scrapers, both of which extend, in particular parallel to each other, in the direction of the longitudinal extent of the scraper strip element, in particular across its entire respective longitudinal edge, and which extend in the direction of the width of the scraper strip element.perpendicular to the parallel course, they are offset from each other by a distance.

[0014] The first and second scraper strips are each formed by at least one floor contact element, in particular by several floor contact elements arranged directly adjacent to one another on the base part in the direction of the longitudinal extension of the scraper strip element or the base part. It is particularly advantageous if all the floor contact elements of the scraper strip element are made of the same material and / or have the same shape. All floor contact elements of the scraper strip element are thus preferably identical to one another with regard to shape and material.

[0015] The individual floor contact elements of each scraper strip can additionally or alternatively have complementary contact surfaces in the direction of the longitudinal extension of the scraper strip element, via which they are arranged directly abutting each other on the base part of the scraper strip element.

[0016] It is intended that the ground contact elements of the scraper strip element each form part of the front surface and part of one of the two longitudinal side flanks of the scraper strip element with their outer surface. Ideally, the ground contact elements are thus arranged on the scraper strip element such that their outer surface forms the edge area between the front surface of the scraper strip element and one of the longitudinal side flanks. The base part is therefore ideally completely covered by the ground contact elements with respect to the outer surface of the scraper strip element in the area of ​​the front surface and the longitudinal side flanks, specifically in the area of ​​these longitudinal edges or in the area of ​​the surface portions of the front surface and the respective longitudinal side flank that abut at the longitudinal edges, or the edge formed by them.This means that the wiper strip element according to the invention offers increased wear resistance in the area of ​​the two opposing longitudinal edges, and the user can selectively or successively attach the wiper strip element to the support plate with one or the other longitudinal edge pointing downwards vertically or in two operating positions.

[0017] The wiper blade element is further provided with a three-dimensionally shaped contact element on its rear side, projecting and / or receding in a direction perpendicular to the rear side, for positive engagement with a counter-form formed by a support plate. The contact element is thus suitable for bearing against a counter-form of a support plate in the assembled state. It is provided that the contact element comprises a contact step formed by the base part, with a rear contact wall and a front protective wall spaced from the rear contact wall by a side wall surface in the direction of the front. In this way, a contact structure is obtained that includes several walls or surfaces extending at varying intervals towards the front, which run transversely to the direction towards the front on the wiper blade element and are formed in particular by the base part.These walls can be flat or even and / or parallel to each other. The side wall surface used to space these walls can be used to secure the position of the scraper bar element on the support plate, as described in more detail below, and can therefore also be designed and intended for direct contact with the support plate. Simultaneously, the base component itself can provide protection for the system assembly with the help of the protective wall, as also described in more detail below.

[0018] The protective wall primarily protects the side wall of the system assembly facing the front of the scraper strip element. Protection of the system assembly itself can be achieved, for example, by designing the base part in such a way that the three-dimensionally formed system assembly is completely overlapped by the base part towards the front. This means that, in this case, the base part can be wider, at least in some areas, towards the front than it is at the level of the system assembly, or at least at the level of the side wall of the system step.This means the base part overlaps this area towards the front and, during operation where the scraper strip element is primarily in contact with, for example, milled material via its front and respective front longitudinal edge, can cover and thus mechanically protect the area of ​​the feed stage behind it, in the opposite direction to the front, including the protective wall adjoining the side wall. In this way, it can be ensured, for example, that even with progressive wear of the scraper strip element, the feed structure, especially in the area of ​​the rear feed wall and in the area of ​​the side wall, remains intact.

[0019] The use of a three-dimensionally shaped contact element on the back of the wiper blade element, projecting perpendicularly from the back of the element and / or receding from the back of the element, facilitates a positive fit against a counter-form formed by the support plate. This contact element can be designed as a groove running lengthwise along the wiper blade element and / or as a beam running lengthwise along the wiper blade element. In the case of a groove, the groove bottom then forms, for example, the front contact wall, and the end faces of the groove walls form the rear contact wall.In the case of a contact beam, for example, the rear side of the contact beam, opposite the front side, forms the rear contact wall, and the rear wall of the remaining base part, adjoining the contact beam towards the front, forms the front contact wall. The contact configuration is preferably mirror-symmetrical with respect to a virtual plane extending along the longitudinal axis of the wiper blade element, in order to enable a positive-locking contact in both operating positions of the wiper blade element. The contact configuration can also include a fine structure, such as ribbing or similar.

[0020] The system may be designed to include an anti-displacement device acting in the longitudinal direction of the wiper blade element. This anti-displacement device may, for example, comprise one or more structural elements that rise and / or descend at an angle to the longitudinal direction, particularly in the form of three-dimensional deformations formed in the base part, especially in the area of ​​the system's rear surface and / or the longitudinal side flanks. When the wiper blade element is used as intended, it may be provided that corresponding complementary counter-formations are present on the support plate, which align with the three-dimensional deformations of the wiper blade element.It can be provided that the wiper blade element has one or more projecting and / or recessed three-dimensionally deformed contact elements on its longitudinal side flanks, particularly vertically, for positive engagement with a counter-formation formed by a support plate of one of the wiper plates. In this way, a unique relative position of the wiper blade element on the support plate is established, with the contact elements on the wiper blade element preferably being designed such that a unique relative position of the wiper blade element relative to the support plate is achieved in both operating positions of the wiper blade element. For this purpose, the contact elements can, for example, be formed on the two longitudinal side flanks of the wiper blade element.

[0021] In particular, the anti-displacement device can be designed as a projection and / or recess formed in the side wall surface of the feed step. This can, for example, take the form of a recess in the side wall surface and / or a projection extending from a wall surface of the side wall surface transversely to the longitudinal direction of the wiper blade element and transversely from the rear of the feed step to the front. In this way, one or more stop surfaces can be provided that extend at least partially transversely to the longitudinal direction of the wiper blade element and, in conjunction with complementary feed features on the support plate, can form a transverse stop or positive locking mechanism that positively prevents transverse displacement of the wiper blade element on the support plate, specifically transversely to a feed direction and in the horizontal direction.Suitable counter-positioning features can be provided on the support plate. Ideally, the side wall surface, particularly in the area of ​​such projections and / or recesses in the side wall that extend transversely from the rear contact surface to the front of the wiper blade element, should be overlapped by the protective wall in the direction of the front of the wiper blade element, in order to protect this area from external influences during operation.

[0022] Preferably, the wiper blade element, in particular the base part, has at least one contact pocket on its rear surface, which is open, in particular, simultaneously towards and / or extending into the surface of a longitudinal side flank and / or the side wall of the contact step and which forms part of the three-dimensionally shaped contact formation of the contact step. The contact pocket thus denotes a local recess and / or indentation within the rear surface of the contact element, which does not completely penetrate the base part. The contact pocket can be designed such that it is open not only towards the rear surface of the contact element, but also simultaneously towards a longitudinal side flank and / or the side wall of the contact step. This means that, viewed from the rear surface of the wiper blade element towards the front, the contact pocket is completely covered or overlapped by parts of it, in particular at least by the base part.It can be advantageous if several such pockets are present on the back surface of the wiper blade element, particularly in a point-symmetrical arrangement in a top view of the back surface of the wiper blade element or in a virtual projection plane where the area of ​​the back surface is maximized. Ideally, at least two such pockets are enclosed by the wiper blade element, with one of the at least two pockets opening towards one longitudinal side and the other opening towards the other longitudinal side.

[0023] It can be advantageous if the at least one floor contact element of at least one of the scraper strips has its respective outer surface flush with an outer surface of the adjacent base part in the area of ​​one of the longitudinal side flanks and / or the front of the scraper strip element. Ideally, all of the floor contact elements of at least one of the two scraper strips, and in particular both scraper strips, should be flush with an outer surface of the adjacent base part. In this area, the base part and the at least one floor contact element, and in particular all of the floor contact elements of one and / or the other scraper strip, are then correspondingly free of any protrusion relative to each other.It is particularly preferred if all floor contact elements of a scraper strip, together with their respective outer surfaces, are arranged without protrusion relative to the respective outer surface in the area of ​​one of the longitudinal side flanks and / or the front of the scraper strip element on the base part.

[0024] The wiper strip element can be designed such that, in a projection plane perpendicular to the longitudinal direction of the wiper strip element, it tapers from the front towards the rear surface. The cross-sectional profile of the wiper strip element can thus, in a section plane perpendicular to the longitudinal direction, be trapezoidal or at least trapezoidal in shape, particularly at least partially, where "trapezoidal" refers to a cross-sectional contour that does not strictly correspond geometrically to a trapezoid but is essentially trapezoidal. This taper can be formed by the entire wiper strip element or, alternatively, only by the base part of the wiper strip element.

[0025] It is possible that the areas of the longitudinal side flanks formed by the base part run parallel to each other in a projection plane perpendicular to the longitudinal direction. However, it may be preferred if the areas of the longitudinal side flanks formed by the base part run at an angle to each other in a projection plane perpendicular to the longitudinal direction at an angle in the range of 45° to 20°, in particular 35° to 25°. Additionally or alternatively, it may be advantageous if the areas of the longitudinal side flanks formed by the base part run at an angle in the range of 25° to 10°, in particular 20° to 15°, with respect to an axis of symmetry running in this projection plane.In these cases, a kind of undercut is created on the base part opposite the front of the wiper strip element in the direction of the rear of the system, so that wear on the base part can be reduced when the wiper strip element is used as intended.

[0026] It may be advantageous if the wiper blade element is mirror-symmetrical with respect to a plane of symmetry extending along its longitudinal direction. In this case, the wiper blade element can be used identically in both operating positions, since the relative positions of the base part and the respective ground contact elements relative to the support plate are identical in both operating positions during intended use of the wiper blade element.

[0027] Alternatively, it is also possible that the scraper strip element is mirror-symmetrical on the rear side with respect to a plane of symmetry extending along its longitudinal direction, and asymmetrical in the area of ​​the longitudinal side flanks and / or on the front, or that the scraper strip element is designed such that it is not mirror-symmetrical along any plane of symmetry extending along its longitudinal direction. In this way, differences can arise between the first operating position, in which the first scraper strip faces the ground, and the second operating position, in which the second scraper strip faces the ground, particularly with regard to the relative orientation of the respective ground contact elements of the first and second scraper strips to the ground, especially if these are identical in shape both individually and to each other.Alternatively or additionally, this can also be achieved by ensuring that at least one floor contact element of the first scratch strip is designed differently in terms of shape compared to at least one floor contact element of the second scratch strip.

[0028] The ground contact elements of the first and second scraper strips can have a long side and a short side on their outer surface in a plane perpendicular to the longitudinal direction of the scraper strip element. The extent of the ground contact elements on the long side is correspondingly greater than on the short side. For this type of design and arrangement of the ground contact elements on the base part, it can be provided that the ground contact elements of the first and second scraper strips form part of the front surface with their long side and part of the respective longitudinal side flank with their short side, or vice versa, of the scraper strip element.Alternatively, it is possible that the at least one ground contact element of the first scraper strip forms part of the front face with its long side and part of one of the longitudinal side flanks with its short side, and that the at least one ground contact element of the second scraper strip forms part of the other longitudinal side flank with its long side and part of the front face with its short side. However, it can be particularly advantageous for these embodiments if the individual ground contact elements are identical to each other in terms of their shape. In this way, with identical embodiments of the ground contact elements, it is possible to achieve different arrangements of the at least one ground contact element of the first scraper strip compared to the at least one ground contact element of the second scraper strip.

[0029] The different designs of the first and second scraper strips in their respective operating positions allow for the prioritization of certain functions and / or effects of the scraper strip element during the operation of a soil milling machine, while simultaneously emphasizing other functions and / or effects. For example, the at least one ground contact element of the first scraper strip can be arranged on the base in such a way that, in one operating position of the scraper strip element, it primarily provides a scraping function. In this embodiment, the longitudinal edge formed by the respective at least one ground contact element runs directly on the soil surface. This embodiment can achieve particularly good scraping results.However, this increases the risk that the scraper blade element will get caught on an obstacle, even one that protrudes relatively little vertically from the floor surface. Alternatively, it can therefore be advantageous if the at least one floor contact element of the second scraper blade is arranged on the base part in such a way that, in a working position of the scraper blade element, it primarily provides a sliding function. In this embodiment, the leading longitudinal edge formed by the respective at least one floor contact element, viewed in the working direction, extends, for example, at a vertical distance from the floor surface, and the floor contact element approaches the floor surface in the area of ​​its longitudinal side flank when the scraper blade element is pressed onto the floor surface.In this case, the floor contact element provides a kind of ramp, thus reducing the risk of the scraper blade getting stuck on an obstacle that protrudes relatively little vertically from the floor surface. On the other hand, the risk may increase that the scraping result will be adversely affected and, in particular, that relatively small particles will not be scraped off.

[0030] It can be advantageous if the at least one ground contact element of the first scraper strip, in particular with its surfaces forming part of the front and part of the respective longitudinal side flank, is tilted relative to the at least one ground contact element of the second scraper strip, in particular with its surfaces forming part of the front and part of the respective longitudinal side flank, in a projection plane perpendicular to the longitudinal extension direction of the scraper strip element and relative to an axis of symmetry running in this projection plane, at least at the rear contact surface of the scraper strip element, by a different angle. This can be particularly advantageous if the ground contact elements of the first and second scraper strips are identical.

[0031] The scraper strip element, or at least its base, can have a T-shaped cross-sectional profile perpendicular to its longitudinal axis. The contact step can thus, in particular, have a contact beam extending in the longitudinal direction, projecting towards the rear of the base, opposite to the direction towards the front. Legs formed by the base can then project transversely to the longitudinal direction and transversely from the rear to the front of the scraper strip element onto both sides of the contact beam, thus overlapping the contact beam and projecting beyond it in this transverse direction. In particular, the rear side formed by these legs can simultaneously be part of the contact step.

[0032] The first and second scraper strips can each have several floor contact elements arranged side by side in the longitudinal direction of the scraper strip element, particularly directly adjacent to one another. In this way, a scraper strip extending relatively far in the longitudinal direction of the scraper strip element can be obtained using comparatively small or short floor contact elements.

[0033] Another aspect of the invention relates to a soil milling machine, particularly a self-propelled one, with a scraper blade. The scraper blade can be part of a milling drum housing. In particular, the scraper blade can form a rear boundary of an interior space of the milling drum housing when viewed in the working or milling direction of the soil milling machine, or it can be arranged trailing the milling drum in the working direction. Furthermore, the scraper blade can be adjustable between a maintenance position with its lower edge raised above the ground and a working position lowered to the ground. Further possible design features of a soil milling machine are given below by way of example in the description of the figures.

[0034] The scraper plate comprises a support plate and at least one replaceable scraper strip element according to the invention, as described above, is arranged at its lower edge. This means that when the scraper plate is in the working position lowered to the ground, the scraper plate contacts the ground via the scraper strip element. The support plate can have a receiving device in its lower vertical region, particularly its edge region, for the positive engagement of the at least one scraper strip element, acting at least partially in the forward direction of the soil milling machine and vertically upwards. With respect to the vertical extent of the scraper plate, the lower region refers in particular to the lower third, and especially the lower fifth, of the support plate.The receiving device is preferably designed in relation to the scraper strip element such that the scraper strip element is mounted on the support plate in such a way that the scraper plate, in its working position lowered to the ground, contacts the ground exclusively via the scraper strip element and not via the support plate.

[0035] The specific embodiment of the receiving device on the support plate, which ideally is at least partially complementary to the contact area of ​​the scraper blade element, can vary. For example, it can be designed as a receiving step, particularly with a contact surface for the scraper blade element that is set back from the front of the support plate in the opposite direction of travel or working of the soil milling machine. Additionally or alternatively, it can be designed as a contact groove and / or with ribbing or similar contact structures. It is also possible to design the connection between the scraper blade element and the support plate as a dovetail joint or the like. Furthermore, one or more positive locking elements can be part of the receiving device.-structures designed for at least partial, and in particular positive, engagement with one or more of the contact pockets preferably encompassed by the wiper strip element. These positive-locking elements can be designed, in particular, such that they project from the support plate opposite the surfaces adjacent to the respective positive-locking elements. They can be designed to be at least partially positive-locking and complementary to one or more of the contact pockets.

[0036] If the receiving device is designed in the form of a receiving step, it is advantageous if it is at least partially complementary to the contact step of the wiper blade element. This enables a direct, positive-locking contact of the contact step with the support plate and thus particularly reliable positioning.

[0037] It is advantageous if the receiving device includes a rear wall surface opposite which positive-locking structures are formed that project forward and / or backward in the direction of the scraper strip element and / or project forward and / or backward transversely to the direction of the scraper strip element, and that are complementary to the contact surface of the scraper strip element. These structures overlap the base part in the direction of the front of the scraper strip element. In this way, when the scraper strip element is arranged on the support plate, the structures of the receiving device can be protected from mechanical influences, for example, from the milled material. The positive-locking structures can be formed, in particular, by the contact pattern on the scraper strip element and by the counter-contact pattern on the support plate.

[0038] It is particularly advantageous if the scraper blade element, at least in a region of its base, and especially together with at least a region of the ground contact element, forms a clearance angle with its lower side flank surface opening against the ground surface, particularly in the range of greater than 0° to 20° and especially in the range of 5° to 15°. In this way, the base can be protected from wear and, provided the ground contact element is also designed accordingly, a kind of scraping edge can be obtained with which particularly good scraping results can be achieved.

[0039] Additionally or alternatively, the ground contact element can be designed so that its side flanks form an approach angle opening towards the ground surface in the working direction of the soil milling machine, particularly in the range of greater than 0° to 30° and especially in the range of 10° to 20°. This arrangement does not create a scraping edge on the ground contact element, but rather a kind of approach ramp that facilitates gliding over relatively small ground obstacles.

[0040] Finally, another aspect of the invention relates to a method for operating a scraper shield of a soil milling machine, in particular a soil milling machine according to the invention, as described above.

[0041] The method can, in particular, include in step a) releasing a fastening device by which at least one scraper blade element is attached in a first operating position to a support plate of the scraper blade such that, during operation of the soil milling machine, the scraper blade element makes contact with the ground via a first scraper blade of the scraper blade element. For example, if the scraper blade element is worn in the area of ​​the first scraper blade or if the operating characteristics of the scraper blade element are to be changed, the scraper blade element can thus be released from the first operating position.

[0042] In step b), it can now be provided that the same scraper strip element is adjusted to a second operating position on the support plate. This can be done in such a way that, for example, the scraper strip element now makes contact with the ground during operation of the soil milling machine via a second scraper strip of the scraper strip element. The scraper strip element can be rotated accordingly, for example.

[0043] In step c), the scraper strip element is then attached to the support plate in the second operating position by locking the fastening device. The base part can cover the positive locking connection between the support plate and the contact surface of the scraper strip element towards the front of the scraper strip element, thereby simultaneously protecting the positive locking connection with the scraper strip element itself, particularly its base part. When the soil milling machine continues operating, the second scraper strip then makes contact with the soil surface.

[0044] The method according to the invention can preferably be further developed such that the relative position of the at least one ground contact element of the first scraper strip in the first operating position of the scraper strip element is a) identical to the relative position of the at least one ground contact element of the second scraper strip in the second operating position of the scraper strip element, and thus results in the same scraping behavior, or b) differs from each other, and thus the scraping behavior of the scraper plate can be varied depending on the current operating position of the scraper strip element. The method can therefore include changing at least the primary operating characteristics of the scraper strip element installed on the support plate by changing the positioning of the scraper strip element from the first operating position to the second operating position or vice versa.

[0045] The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures. The figures schematically show: Fig. 1 a side view of a soil milling machine; Fig. 2 a perspective rear view of a milling drum housing with a scraper plate; Figures 3A to 3E a first embodiment of a scraper plate with a scraper strip element; Figures 4A to 4D a second embodiment of a scraper plate with a scraper strip element; Figures 5A to 5 a third embodiment of a scraper plate with a scraper strip element; Figures 6A to 6C a fourth embodiment of a scraper plate with a scraper strip element; Figures 7A to 7E a fifth embodiment of a scraper plate with a scraper strip element; and Fig. 8 a flowchart of a process.

[0046] Identical or similarly functioning components are designated with the same reference numerals in the figures. Repeating components are not necessarily designated separately in each figure.

[0047] Figur 1 Figure 1 shows a side view of a soil milling machine 1. This machine can be, for example, a road milling machine or a cold milling machine, in particular a mid-rotor type. The soil milling machine 1 can also be designed as a rear-rotor machine. It can have a machine frame 3, a driver's platform 2, a drive unit 4 and / or driving devices 6 and can, in particular, be self-propelled. The drive energy required for driving and working operation can be provided by the drive unit 4. The drive unit can have one or more combustion and / or electric motors. By means of a milling drum 9, which is rotatably mounted about the axis of rotation 10 in a milling drum housing 7, the soil 8 to be milled can be milled in the feed direction or working direction A during the operation of the soil milling machine 1.The milled material can be transferred from an interior of the milling drum box 7 to a transport vehicle (not shown) via the discharge conveyor 5 and transported away from it.

[0048] A possible design and operating principle of the milling drum box 7 are exemplified in Fig. 2 The milling drum housing 7 can be bounded on both sides intersected by the geometric axis of rotation 10 of the milling drum 9 by side plates 13. The side located at the rear in the working direction A can essentially be formed by a scraper plate 14 of the milling drum housing 7. The scraper plate 14 can have a support plate 20. The scraper plate 14 can be adjusted between a raised maintenance position and a working or scraping position lowered to the ground relative to the milling drum and / or the machine frame by means of a height adjustment device 15, here for example at least one hydraulic cylinder.

[0049] During operation, the soil milling machine 1 removes the soil 8 through the rotation of the milling drum 9 by means of the chisel devices (not shown) attached to it, and transports the loosened milled material away, for example, via the discharge conveyor 5. A milling track 18 with milling edges 11, sidewall surfaces 19, and a milling bed 12 is formed in the soil 8. The depth of the milling bed 12 depends on the set milling depth of the soil milling machine 1. The scraper plate 14 can be adjusted to the milling depth by means of the height adjustment device 15. The scraper plate 14 can be guided directly on the milling bed 12 in a scraping motion. This can result in comparatively high abrasive loads in the area of ​​the lower edge 16 of the plate.

[0050] To protect the scraper plate 14 from wear, a scraper strip 17, which is replaceably arranged on the support plate 20, can be enclosed by the scraper plate 14, particularly in the area of ​​a lower edge 16 of the plate, where the scraper plate 14 scrapes along the milling bed 12 in the working direction A during operation or milling of the soil milling machine 1. The scraper strip 17 can comprise one or more scraper strip elements 21 arranged side by side on the support plate 20. Furthermore, one or more side protection elements can be provided that can come into contact with the milling edges 11 projecting beyond the milling bed 12 and the side surfaces 19, and protect the support plate from abrasive influences. These can also be formed by corresponding scraper strip elements 21. The scraper strip 17 is located on the side of the scraper plate 14 that is at the front in the working direction A.In other words, the scraper strip 17 lies particularly on the side of the scraper shield 14 facing the interior of the milling drum housing 7 and thus the milling drum 9.

[0051] The Figuren 3A bis 7E Illustrate various embodiments and design details of possible design alternatives of the wiper shield 14 and in particular the wiper strip element 21 of the wiper strip 17 and the support shield in the contact area with the respective wiper strip element 21.

[0052] Fig. 3A Figure 1 illustrates a possible structure of the support shield 20 in a perspective view. It should be noted that the support shield 20, as shown in the figure 1, is constructed of a material that is 2000 g / m². Fig. 3A shown, it can be fully formed as depicted, or even, especially in the direction of width and height, larger, as shown in the Fig. 3A The dashed contour lines shown indicate the design. This also applies to the embodiments of the support plate 20 explained in more detail in the following figures, although these are not shown separately for clarity. The support plate 20 can have various elements and / or areas, such as a base plate 22, a front support plate 23, and a locking strip 24. These can be connected to one another, particularly in a way that is not separable without damage, and / or be formed as a single, solid piece.

[0053] To the viewer in the Fig. 3A The lower area of ​​a front surface 28 of the support plate 20 faces the front surface. In operation, this side is therefore, in particular, facing the interior of a milling drum housing 9, for example, as described above. On the front surface 28, the support plate can have, as part of a receiving device 25, a receiving step 26 that is at least partially recessed towards a rear surface 29 relative to the surface of the front surface 28 adjacent to the receiving device 25. This receiving step can have a step height 30 perpendicular to the surface of the front surface 28. The receiving step can thus, in particular, represent a kind of recess in the area of ​​a lower edge 31 of the support plate 20, as shown in the Fig. 3A indicated by the dotted contour lines 32. This receiving stage can form a counter-position for the at least partially positive-locking engagement of one or more wiper strip elements (21), as illustrated in more detail in the following figures.

[0054] The receiving stage 26 can have a rear wall surface 33 that limits the receiving stage 26 in the opposite direction of work A and a ceiling wall surface 34 that limits the receiving stage 26 vertically upwards. These can be at right angles to each other. In the area of ​​the rear wall surface 33, one or more openings 35 for one or more fastening element receptacles can be located, as described in more detail below. The receiving stage 26 can also include a counter-formation 27, formed in particular, for example, by the locking strip 24, which can, by way of example, have three-dimensional deformations of the contact surface or the outer surface of the receiving stage 26 extending in or against the direction of work A and / or transversely thereto.These structures can be designed to engage, at least partially, with a contact formation 48, described in more detail below and formed by the wiper strip element 21, when the wiper strip element 21 is mounted or attached to the support plate 20 in the intended manner. In particular, this counter-formation can have one or more three-dimensional structures, for example, in the form of one or more recesses and / or projections, which provide a displacement lock that positively prevents a wiper strip element 21 bearing against the counter-formation from moving in the transverse direction or horizontal direction and perpendicular to the feed direction or working direction A.The counter-formation can therefore, in particular, comprise a pressure surface running essentially transversely to the feed direction A and formed by the ceiling wall surface 34, which in combination transfers support forces vertically downwards and forwards in the feed direction from the support plate 20 to the wiper strip element 21 which is positively connected to it.

[0055] Ideally, the positive locking between the scraper strip element 21 and the support plate 20, when the scraper strip element 21 is picked up by the receiving device 25 and in particular by the receiving stage 26 on the soil milling machine 1, exists at least against the working direction A, in the vertical direction upwards and in the horizontal direction in the direction of the axis of rotation 10, so that in particular support forces can also be effectively applied to the scraper strip element 21 by the support plate 20, which counteract a lateral displacement of the scraper strip element 21.

[0056] Details of a possible construction of a wiper strip element 21 are given, for example, for a first embodiment in the Figuren 3B und 3C specified. Fig. 3B is a perspective oblique view of the rear side 39 of the wiper strip element 21 and Fig. 3C a cross-sectional view in the section plane S from Fig. 3B in the direction of view I.

[0057] The scraper blade element 21 can have a longitudinal extent L in a longitudinal direction and a lateral extent B in a lateral direction. The longitudinal extent L essentially corresponds to the length of the scraper blade element 21 or its horizontal extent transverse to the working direction A along the lower edge 31 of the support plate 20 when the scraper blade element 21 is arranged on the support plate as intended. The lateral extent B, on the other hand, corresponds to the extent of the scraper blade element 21 perpendicular to the longitudinal extent L in the lifting direction of the scraper plate 14 between its maintenance and its working or scraping position. In addition, the scraper plate 14 can have a thickness extent D in a thickness extent direction that is perpendicular to the lateral extent direction B and to the longitudinal extent direction L.The wiper strip element 21 is preferably designed such that L > B > D applies.

[0058] Especially also Fig. 3C This clarifies further details of a possible basic structure of the wiper strip element 21. The wiper strip element 21 can have a base part 37 and several bottom contact elements 38 firmly connected to the base part 37, in particular via a soldered connection. The base part 37 can, for example, be a forged part, especially one that has been machined, and in particular made of a steel material. The bottom contact elements 38 can, in particular, be made of a hard metal.

[0059] The wiper strip element 21 can comprise a rear mounting surface 39, a front mounting surface 40 opposite the rear mounting surface 39, and side flanks 41. The side flanks 41 are those side surfaces of the wiper strip element 21 by which the front mounting surface 40 is connected to the rear mounting surface 39. The side flanks 41 can have two opposing longitudinal side flanks 42 extending in the longitudinal direction L and two opposing short side flank surfaces 43 extending in the width direction B. The transition extending in the longitudinal direction L of the wiper strip element 21 between the front mounting surface 40 and the respective longitudinal side flanks 42 and 43 is formed by a first longitudinal edge 46 or a second longitudinal edge 47.The first longitudinal edge 46 can be part of a first scratch strip 44 formed in the present embodiment by several ground contact elements 38 arranged side by side and adjacent to one another in the longitudinal direction L, and the second longitudinal edge 47 can be part of a second scratch strip 45 formed in the present embodiment by several ground contact elements 38 arranged side by side and adjacent to one another in the longitudinal direction L. The first longitudinal edge 46 and the first scratch strip 44 can run parallel to the second longitudinal edge 47 and the second scratch strip 45, respectively, and extend, in particular, along an edge region of the front face 40 and the respective longitudinal side flank 42 in the longitudinal direction L.Thus, the scraper strip element 21 simultaneously comprises two scraper strips 44 and 45 opposite each other perpendicular to the longitudinal extension direction L of the scraper strip element 21, which, as explained in more detail below, makes it possible for the scraper strip element 21 to be used in two different operating positions relative to the support plate 21.

[0060] The rear surface 39 of the wiper strip element 21 can comprise a surface formation 48, as shown in particular, for example, by the Fig. 3B The attachment element 48 refers to the three-dimensional design of the attachment surface on the rear side of the system, comprising raised areas and / or recesses. These raised areas and / or recesses can extend in the longitudinal direction L, the lateral direction B, and / or the thickness direction D. In the present embodiment, the attachment element 48 comprises, in addition to an attachment beam 49 projecting in the thickness direction D and extending longitudinally in the longitudinal direction L, several attachment pockets 50 recessed into the side walls 51 of the attachment beam. The attachment pockets 50 are recessed into the side wall 51 of the attachment beam 50 extending in the longitudinal direction L and are each open in a lateral direction B and towards the rear side 39 of the system.Based on their three-dimensional contour, the contact pockets 50 can be designed to complement contact projections 52 in the contact strip 24 of the support plate 21. In the assembled state of the wiper strip element 21, these projections engage in contact pockets 50 of the wiper strip element 21 transversely to the longitudinal direction L and, in particular, in this way, together form a displacement protection device 55 of the wiper strip element 21 relative to the support plate 20 in the longitudinal direction L. The contact projections 52 can thus be parts of a positive-locking structure 70 on the support plate 20, which is designed for positive locking with the contact step 65 of the wiper strip element 21. The positive-locking structure 70 can therefore be formed, in particular, by the contact formation 48 and the counter-contact formation 48 in positive locking.The mounting pockets 50 and the mounting projections 52 can be completely covered by the base part 37 in the direction of the front 40 of the wiper strip element 21. For example, the mounting pockets 50 can thus create a recess 68 which can be used for positive locking. In addition to or as an alternative to one or more recesses 68, one or more structures projecting from the side wall 51, such as pins or similar features, can also be used for positive locking.

[0061] The wiper strip element 21, in particular the base part 37, can have an overall T-shaped cross-sectional profile 71, as for example in the Fig 3C This can be achieved by a support beam projecting on the rear side in the opposite direction to the front, with a rear support wall 66 and side walls 51 extending transversely thereto and in the longitudinal direction, which merges into front protective walls 67, also formed on the rear side by the base part 37, projecting transversely to the longitudinal direction and transversely to the front direction over the support beam on both opposite sides. The rear support wall 66, at least one of the adjacent side walls 51, and at least one front protective wall 67 adjacent to the at least one side wall 51 can thus collectively form a support step 65, for the at least partially complementary reception of which the support plate is designed in the receiving area 25. In principle, and regardless of the specific embodiment, it may be preferred if side wall 51 orthe side walls 51 are dimensioned such that the scraper strip element 21 does not, or at least not completely, rest against the support plate with the surface formed by the protective wall 67, but is spaced away from it by an air gap in the direction of the front of the scraper strip element 21.

[0062] The wiper strip element 21 can be designed to be mirror-symmetric with respect to a plane of symmetry C extending in the longitudinal direction L and in the thickness direction D, as shown for example in the Fig. 3C This is evident. The support beam 49 also includes two opposing, longitudinally extending side walls 51 parallel to each other in the longitudinal direction L, each with support pockets 50 designed to complement the support projections 52.

[0063] For mounting the wiper strip element 21 to the support plate 20, the wiper strip element 21, as part of a fastening device 56, can, for example, have several fastening element receptacles 54. The fastening element receptacles 54 can be one or more through-openings extending from the front 40 through the base part 37 to the rear of the system. Corresponding fastening element receptacles 54, also for example in the form of openings 35, can also be provided on the support plate 21.

[0064] Fig. 3D illustrates by example a fully assembled fastening device, wherein Fig. 3D a cross-sectional view through the wiper plate 14 transverse to the longitudinal direction L or in a section plane running in the working direction A and in the vertical direction in a state in which the wiper strip element 21 is mounted on the support plate 20. The section plane can be derived from the section plane S of the Fig. 3B The two openings 35 and 54 can accommodate a fastening element 53, such as a fastening screw. Viewed in the working direction A, this screw can be secured on the back of the support plate 20 by a nut. The fastening screw can be a carriage bolt and / or a countersunk screw. Its shank can have a polygonal profile, for example, a square profile, to prevent rotation. Accordingly, one or more of the through-openings in the base part and / or the openings 35 in the support plate can have a polygonal cross-sectional profile that is at least partially complementary. The nut can be, for example, a self-locking nut. The fastening device 56 is thus ideally designed to be removable without damage. Fig. 3D This further clarifies that the wiper strip element 21, for example due to its design described above, can be mounted on the support plate in two alternative operating positions. In the operating position shown in the Fig. 3D As shown, the second longitudinal edge 47 is located at the lower vertical end of the wiper plate 14. However, it is also possible to arrange the wiper strip element 21 on the support plate 20 such that the first longitudinal edge 46 is located at the lower vertical end of the wiper plate 14. The wiper strip element 21 is thus reversibly arranged on the support plate 20.

[0065] Especially also Fig. 3D This clarifies that the base part 37 is designed such that the contact areas or their contact formations formed by the contact stages 65 are completely overlapped and thus protected in the direction from the rear to the front of the scraper strip element 21. This also applies to the counter-contact formations on the support plate 20, in particular also to the locking strip 24.

[0066] The specific design of the base part 37 and / or the ground contact elements 38 can also vary. From the cross-sectional view perpendicular to the longitudinal direction L according to the Fig. 3C It is evident that the wiper strip element 21 can have an overall essentially trapezoidal contour, with the base of this trapezoid being formed in particular by the front face 40 and the legs of this trapezoid being formed by the longitudinal side faces 42. This also applies to a projection of the wiper strip element 21 onto a virtual projection plane perpendicular to the longitudinal extension direction L.

[0067] Additionally or alternatively, it is possible that the wiper strip element 21 or at least the base part 37 is designed such that the surfaces of the longitudinal side flanks 42, for example in a projection into a virtual projection plane perpendicular to the longitudinal extension direction L or in a cross-sectional view, as for example in the Fig. 3C The two side flank surfaces 42 are positioned at an angle E to each other and approach each other in the direction from the front 40 to the rear 39, or the wiper strip element 21 or at least the base part 37 tapers in this direction. The angle E can, for example, be in a range of 45° to 5°, in particular 45° to 20°. Additionally or alternatively, it is possible that one and / or the other of the two side flank surfaces 42 runs at an angle F to the plane of symmetry C. The angle F, or its magnitude, can, for example, be in a range of 25° to 2.5°, in particular 25° to 10°. It can be advantageous if the angle F of both side flank surfaces is identical, at least in magnitude.

[0068] In the Figuren 3A bis 3E The embodiment shown further demonstrates that the ground contact elements 38 can transition flush with the adjacent respective outer surface of the base part 37 on the respective side flank surface 42 and / or on the front surface 40.

[0069] During milling operation, or when the scraper shield 14, as shown in the side view according to the Fig. 3E As shown, when one of its scraper strips 44 / 45 or its longitudinal edges 46, 47 scrapes along the floor surface 8 in the working direction A, it is possible to provide a clearance angle G and thus counteract floor contact of the base part 37 during operation. In the present embodiment, the clearance angle G extends over the base part 37 and also over the floor contact element(s) 38. In this way, the scraper strip element 21 scrapes directly along the floor surface with its front longitudinal edge 46, which allows for particularly good scraping results.

[0070] The Figuren 4A bis 7E concern alternative embodiments to the one described in the Figuren 3A bis 3E The described embodiments of the support plate 20 and the wiper strip element 21. Accordingly, the preceding information is referred to for each of these embodiments, and based on this, only the existing relevant differences are described in more detail below.

[0071] In the exemplary embodiment according to the Fig. 4A bis 4D A key difference is that in the area of ​​the system formation 48 on the rear side 39 of the system, a substantially flat single surface is provided, and, for example, no system beam is present. In this embodiment, the system pockets 50, as part of the system stage 65, therefore extend into the longitudinal side flanks 42 or are open in the area of ​​the longitudinal side flanks 42. Fig. 4A From a perspective standpoint, this corresponds to the Fig. 3A , Fig. 4B the Fig. 3B , Fig. 4C the Fig. 3D and Fig. 4D the Fig. 3C .

[0072] A special feature of the embodiment according to the Figuren 5A bis 5D The difference lies in the fact that the anti-displacement device 55 is not achieved in this case via the aforementioned mounting projections as part of a locking strip, but rather the receiving device 25 has receiving pins 57 projecting forward in the area of ​​the rear surface 33 of the receiving step 26. These can be designed as bushings and each have an opening 35 for receiving, for example, a fastening screw. On the rear surface 39 of the wiper strip element 21, receiving recesses 58 can be provided that are complementary to the receiving pins 57. Fig. 5A From a perspective standpoint, this corresponds to the Fig. 3A , Fig. 5B the Fig. 3B , Fig. 5C the Fig. 3D and Fig. 5D the Fig. 3C .

[0073] In the exemplary embodiment according to the Figuren 6A bis 6C It is provided that in the support plate 20, in the area of ​​the receiving stage 26, a groove 59 extending in the longitudinal direction L is provided, into which the wiper strip element 21 engages with a guide bar 49. The groove 59 and the guide bar 49 can be designed with complementary positive locking elements, particularly acting in the longitudinal direction L, as described, for example, in the preceding embodiments, in order to achieve, for example, a displacement protection. Fig. 6A From a perspective standpoint, this corresponds to the Fig. 3A and Fig. 6C the Fig. 3D . Fig. 6B corresponds to the view from the Fig. 6A , in this case the wiper strip element 21 is mounted on the support plate 20 in the intended manner.

[0074] Another special feature of the in the Figuren 6A bis 6C The embodiment shown consists in the fact that the support plate 20 is chamfered or beveled in the area of ​​its lower edge. This makes it possible for the clearance angle G to continue beyond the wiper strip element 21, in the opposite direction of work A, in the adjoining area of ​​the lower edge of the support plate 20, in particular without any overhang, as shown in the cross-sectional view according to Fig. 6C hinted at.

[0075] A special feature of the embodiment according to the Figuren 7A bis 7E The difference lies in the fact that the first scratch strip 44 is designed differently and not mirror-symmetrically in its relative orientation to the still mirror-symmetrically formed back side 39 of the scraper strip element 21 compared to the second scratch strip 45 along a plane of symmetry C running in the longitudinal extension device L and thickness extension direction D. Fig. 7A From a viewing perspective, this corresponds to the Fig. 3C , Figuren 7B und 7C the Fig. 3D and the Figuren 7D und 7E the Fig. 3E .

[0076] Even though the ground contact elements 38 of the first scratch strip 44 and the second scratch strip 45 may be identical to each other (but need not be), they may be oriented differently with respect to the aforementioned plane of symmetry C. The ground contact elements 38, as they are configured in the exemplary embodiment according to the Figuren 7A bis 7E shown, can be in a projection plane perpendicular to the longitudinal direction L (= for example, image planes of the Figuren 7A bis 7E ) for example, have a long side 60 and a short side 61. As can be seen, for example, in the Fig. 7A As can be seen, the short side 61 of the ground contact elements 38 of the first scratch strip 44 lies on the front 40 and the long side 60 on the side of the longitudinal side flank 42. The ground contact elements 38 of the second scratch strip 45, on the other hand, are mounted on the base part 37 such that their short side 61 lies on the side of the longitudinal side flank 42 and their long side 60 lies on the front 40. The short side 61 of the ground contact elements 38 of the first scratch strip 44 is further oriented such that it lies in a plane with the outer surface formed by the base part 37 and adjoining these ground contact elements 38. This outer surface can, for example, run essentially perpendicular to the plane of symmetry C of the rear surface 39. The long side 61 of the second scratch strip 45, however, runs at an oblique angle to this plane of symmetry.

[0077] The two possible operating positions of the scraper strip element 21 described above differ in that the relative orientation of the ground contact elements 38 forming the lower edge of the scraper shield 14 is different with respect to the support shield 20 and the ground surface 8, respectively.

[0078] In the Fig. 7B A cross-sectional view shows a first operating position, which essentially corresponds to the operating positions of the previously described embodiments. In this position, the previously described clearance angle G can also be implemented. In this position, a scraping function is thus provided. This is shown in the Fig. 7E illustrated in more detail in a side view.

[0079] In the Fig. 7C In contrast, the part of the longitudinal side flank formed by the long side 60 of the ground contact element 38 runs differently, in particular essentially parallel to the plane of symmetry C. In ground contact, as shown, for example, in the side view according to the Fig. 7D As illustrated in more detail, this results in a kind of ramp being formed by the area of ​​the longitudinal side flank 42 created by the ground contact element 38. The longitudinal side flank 42 does not make contact with the ground with its longitudinal edge furthest forward in the working direction A, but rather with its longitudinal edge furthest rear in the working direction A. An opening angle or ramp angle H is thus formed between the longitudinal side flank 42 of the ground contact element 38 and the ground surface, which opens forward in the working direction A. Comparatively small obstacles projecting vertically upwards from the ground surface can thus be more easily slid over by the scraper blade 14, so that this operating position also provides a more sliding function.

[0080] Fig. 8 Finally, a flowchart illustrates, by way of example, the steps of a method 36 for operating a scraper shield 14 of a soil milling machine 1, in particular a soil milling machine with a scraper shield 14 as described above.

[0081] As a first step, it may be provided that a fastening device 56 is loosened 62 by means of which at least one scraper strip element 21 is attached in a first operating position to a support plate 20 of the scraper plate 14 such that ground contact of the scraper strip element 21 occurs during the operation of the soil milling machine 1 via a first scraper strip 44 of the scraper strip element 21. This loosening 62 may, for example, include loosening a screw connection.

[0082] In a further step, it may be provided that the scraper strip element 21 is adjusted 63 to a second operating position on the support plate 20 such that, during operation of the soil milling machine 1, the scraper strip element 21 makes contact with the ground via a second scraper strip 45 of the scraper strip element 21. This adjustment can, for example, involve rotating or turning the scraper strip element 21.

[0083] It can then be provided that the securing of the scraper strip element 21 in the second operating position to the support plate 20 is achieved by locking the fastening device 56, for example by tightening the previously loosened fastening device 56. In the subsequent operation, the second scraper strip 45 will now be in contact with the ground. At the same time, the base part can cover a positive locking connection between the support plate and the contact step of the scraper strip element towards the front of the scraper strip element.

[0084] Step 63 may provide that the relative position of the first scraper strip or its ground contact elements in the first operating position is identical to the relative position of the second scraper strip or its ground contact elements in the second operating position relative to the ground surface and / or the support plate 20. In this way, the operating characteristics of the scraper strip element 21 are identical in both operating positions. However, it may also be provided that the relative position of the first scraper strip or its ground contact elements in the first operating position differs from the relative position of the second scraper strip or its ground contact elements in the second operating position relative to the ground surface and / or the support plate 20.The two possible operating positions of the wiper strip element 21 can then have different operating characteristics to each other, such as a scraping function in one operating position and a sliding function in the other operating position.

[0085] Fig. 5D This illustrates further possible developments applicable to all of the exemplary embodiments. In particular, it may be provided that the scraper strips 44, 45 are rounded in the area of ​​their longitudinal edge 47 or have a radius R. The radius of this radius may be 0.8 mm or greater.

[0086] It may also be provided that the wiper strip element Reference symbol list

[0087] 1 Floor milling machine 2 Operator's station 3 Machine frame 4 Drive unit 5 Discharge conveyor 6 Travel devices 7 Milling drum housing 8 Floor 9 Milling drum 10 Rotation axis 11 Milling edge 12 Milling bed 13 Side plate 14 Scraper plate 15 Height adjustment device 16 Lower edge of plate 17 Scraper strip 18 Milling track 19 Side wall surface 20 Support plate 21 Scraper strip element 22 Base plate 23 Front plate 24 Locking strip 25 Pickup device 26 Pickup step 27 Counter-formation 28 Front 29 Rear 30 Step height 31 Lower edge 32 Contour lines 33 Rear wall surface 34 Top wall surface 35 Openings 36 Method 37 Base part 38 Floor contact element 39 Rear of system 40 Front 41 Side flank 42 Longitudinal side flanks 43 Short side flanks 44 First scraper strip 45 Second scraper strip 46 First longitudinal edge 47 Second longitudinal edge 48 Mounting formation 49 Mounting beam 50 Mounting pocket 51 Side wall 52 Mounting projection 53 Fastening element 54 Fastening element receptacle 55 Anti-displacement device 56 Fastening device 57 Mounting pin 58 Receptacle recess59 Groove 60 Long side 61 Short side 62 Release 63 Adjust 64 Fasten 65 Mounting step 66 Rear mounting wall 67 Front guard wall 68 Forward / receding 70 Positive locking structure of the holding device 71 T-shaped cross-sectional profile A Working / milling / feed direction B Width extent C Plane of symmetry D Thickness extent E Taper angle F Angle to plane of symmetry G Clearance angle H Opening angle L Longitudinal extent R Curvature S Cutting plane

Claims

1. Scraper strip element (21) for a scraper shield (14) of a soil milling machine (1) - comprising a base part (37) and - comprising several soil contact elements supported by the base part (37), wherein the scraper strip element (21) has - a rear contact surface (39) formed by the base part (37), - a front side (40) opposite the rear contact surface (39) and - side flanks (41) connecting the front side (40) to the rear contact surface (39), comprising two longitudinal side flanks (42) extending in a longitudinal extension direction (L) of the scraper strip element (21) and two short side flanks (43) connecting the two longitudinal side flanks (42) to each other at their ends, and wherein one or more fastening elements (53) or fastening element receptacles (54) for fastening the scraper strip element (21) to the scraper shield (14) the soil milling machine (1) are present, characterized by thatThe scraper strip element (21) has a first scraper strip (44) and a second scraper strip (45) along the longitudinal edges (46, 47) that define the front side (40) in the longitudinal extension direction (L) of the scraper strip element (21), wherein the first scraper strip (44) extends along a first longitudinal edge (46) of the base part (37) where the front side (40) and one of the two longitudinal side flanks (42) abut each other, and wherein the second scraper strip (45) extends along a second longitudinal edge (47) of the base part (37) where the front side (40) and the other of the two longitudinal side flanks (42) abut each other, wherein the first and the second scraper strips (44, 45) are each formed by at least one floor contact element (38), and wherein the floor contact elements (38) each have a part of the front side with their outer surface (40) and form part of one of the two longitudinal side flanks (42) of the wiper strip element (21),and - wherein the wiper strip element (1) has on its rear surface (39) a three-dimensionally shaped contact formation (48) projecting forward and / or backward in a direction perpendicular to the rear surface (39) for positive engagement with a counter-formation (27) formed by a support plate (20), wherein the contact formation comprises a contact step (65) formed by the base part with a rear contact wall (66) and a front protective wall (67) spaced apart from the rear contact wall (66) by a side wall surface (19) in the direction of the front (4).

2. Wiper strip element (21) according to claim 1, characterized by that the base part (37) is designed such that the three-dimensionally shaped attachment formation (48) is completely overlapped by the base part (37) in the direction of the front (40).

3. Wiper strip element (21) according to one of the preceding claims, characterized by thatthe three-dimensionally formed support structure (48) is formed in the form of a support groove extending in the longitudinal direction (L) of the wiper strip element (21) and / or a support beam (49) extending in the longitudinal direction (L) of the wiper strip element (21).

4. Wiper strip element (21) according to one of the preceding claims, characterized by that the assembly (48) has a displacement protection device (55) acting in the longitudinal direction (L) of the wiper strip element (21).

5. Wiper strip element (21) according to claim 4, characterized by that The anti-displacement device (55) is designed as a projection and / or recess (68) formed in the side wall surface (19) of the installation step (65).

6. Wiper strip element (21) according to one of the preceding claims, characterized by thaton the rear side (39) of the installation, at least one installation pocket (50) is formed, in particular one which is simultaneously open in the direction of a longitudinal side flank (42) and which is part of the three-dimensionally formed installation formation (48) of the installation stage (65).

7. Wiper strip element (21) according to one of the preceding claims, characterized by that the wiper strip element (21) is mirror-symmetrical with respect to a plane of symmetry (C) extending along its longitudinal direction (L) on the rear side (39) and asymmetrical in the area of ​​the longitudinal side flanks (42) and on the front side (40).

8. Wiper strip element (21) according to one of the preceding claims, characterized by thatthat at least one floor contact element (38) of the first scraper strip (44) is arranged on the base part (37) such that it provides a scraping function in a working position of the scraper strip element (21), and that at least one floor contact element (38) of the second scraper strip (45) is arranged on the base part (37) such that it provides a sliding function in a working position of the scraper strip element (21).

9. Wiper strip element (21) according to one of the preceding claims, characterized by thatthat at least one ground contact element (38) of the first scraper strip (44) is tilted relative to the at least one ground contact element (38) of the second scraper strip (45) in a projection plane perpendicular to the longitudinal extension direction (L) of the scraper strip element (21) and relative to an axis of symmetry (C) running in this projection plane of at least the rear contact surface (39) of the scraper strip element (21) by a different angle.

10. Wiper strip element (21) according to one of the preceding claims, characterized by that it has a T-shaped cross-sectional profile (71) perpendicular to the longitudinal axis (L).

11. Soil milling machine (1) with a scraper shield (14), the scraper shield (14) comprising a support shield (20) and at least one replaceable scraper strip element (21) arranged at its lower edge, characterized by thatthe scraper strip element (21) is designed according to one of the preceding claims, and that the support plate (20) has in its vertically lower area a receiving device for the positive-locking receiving of the support step of the at least one scraper strip element (21) acting at least partially in the forward direction of the soil milling machine (1) and in the vertical direction upwards.

12. Soil milling machine (1) according to claim 11, characterized by that the receiving device (25) is designed in the form of a receiving stage (26) which is at least partially complementary to the mounting stage (65) of the wiper strip element (21).

13. Soil milling machine (1) according to one of claims 11 or 12, characterized by thatthe receiving device (25) comprises a rear wall surface (33) opposite which, in the direction of the wiper strip element (21), there are form-fitting structures which project forward and / or backward and / or transversely to the direction of the wiper strip element (21) and are complementary to the contact step (65) of the wiper strip element (21), and which are overlapped by the base part (37) in the direction of the front of the wiper strip element.

14. Method for operating a scraper shield (14) of a soil milling machine (1), in particular a soil milling machine (1) according to one of claims 11 to 13, comprising the steps a) loosening (62) a fastening device (56) by which at least one scraper strip element (21) is attached in a first operating position to a support plate (20) of the scraper shield (14) such that soil contact of the scraper strip element (21) occurs during the operation of the soil milling machine (1) via a first scraper strip (44) of the scraper strip element (21); b) Adjusting (63) the scraper strip element (21) to a second operating position on the support plate (20) such that ground contact of the scraper strip element (21) occurs during the operation of the soil milling machine (1) via a second scraper strip (45) of the scraper strip element (21);and c) securing (64) the wiper strip element (21) in the second operating position on the support plate (20) by locking the fastening device and thereby covering a positive locking connection between the support plate (20) and the mounting step (65) of the wiper strip element (21) to the front (40) of the wiper strip element (21) by the base part (37).; 15. Method according to claim 14, characterized by that the relative position of the at least one ground contact element (38) of the first scraper strip (44) in the first operating position of the scraper strip element (21) differs from the relative position of the at least one ground contact element (38) of the second scraper strip (45) in the second operating position of the scraper strip element (21).

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