agitator

Abstract

Agitator for building materials such as tile adhesive or mortar, comprising a stirring element (2) and a shaft (3) projecting from the stirring element (2), wherein the stirring element (2) has at least one base section (2.1) and at least one helical section (2.2) which, starting from the base section (2.1), extends at least partially helically around the shaft (3), wherein a wearing part (4) is detachably fastened to the underside of the base section (2.1) opposite the shaft (3), which wearing part is replaceable if necessary, characterized in that the wearing part is arranged such that, during a stirring process, it comes to rest against the bottom region of a container in which the stirring process takes place, that the stirring element is designed as a stirring basket, that the base section (2.1) is annular and / or closed on the circumference, and that the wearing part (4) is annular with at least one internal opening (4.1) is designed so that the material to be mixed can be conveyed upwards through the inner opening of the wear part during rotation.

Description

The invention relates to a stirrer for mixing materials in the field of manuals, such as adhesives, mortars, etc.Stirrers for mixing materials are already known. They have a stirring element and a shaft protruding from the stirring element. The stirrer can be coupled via the shaft to a drive unit, by means of which the stirrer can be set in rotation.For stirring or mixing materials, the stirrer is introduced into a container in which the material to be mixed is contained. During mixing, the agitator comes at least temporarily into contact with the bottom of the container in order to also subject the material located on the bottom to the mixing process.US 5 356 215 A discloses a mortar mixer.The document EP 3 195 924 A1 discloses an ice agitator.The document DE 20 2011 003 695 U1 discloses a mixing screw for feed mixing cars.CN 206 463 815 U discloses a blower wheel for dirt simulation.The document DE 92 02 607 U1 discloses a stirrer for construction materials.It is problematic here that the stirring element wears relatively quickly on the free end side due to the contact with the base of the container, which substantially shortens the service life of the stirrer.Proceeding from this, it is an object of the invention to specify a stirrer which, despite simple and cost-effective production, has a high durability or service life.The object is achieved by a stirrer having the features of independent claim 1. Preferred embodiments are the subject matter of the dependent claims.According to a first aspect, the invention relates to a stirrer for construction materials such as tile adhesives or mortars comprising a stirrer and a shaft protruding from the stirrer. The stirring element has at least one base section and at least one helical section which, starting from the base section, runs around the shaft in a wound manner at least in sections. The stirring element is designed as a stirring basket. Furthermore, the helical section is preferably fixed to the shank in the region of a free end. On the underside of the base section opposite the shank, a wearing part is detachably fastened, which can be exchanged if necessary.The technical advantage of the stirrer is that the replaceable wear part does not limit the service life of the stirrer by the rapidly wearing lower region of the stirrer element, which frequently comes into contact with the base of the container in which the stirring operation takes place, but rather the stirrer can be used again after the replacement of the wear element.According to the invention, the base section is of annular design and / or of circumferentially closed design. As a result, a surface is provided by the base portion, on which the wearing part can be arranged. The base section can in particular have one or more openings through which the material to be mixed can be conveyed upwards during rotation, so that a vertical material flow is produced in the material to be mixed, which promotes the mixing process.According to the invention, the wear part is annular, in particular circular or substantially circular, with at least one inner opening. Thus, even after the arrangement of the wear part on the base section, the material to be mixed can be conveyed upwards through the inner opening of the wear part during rotation.The outer diameter of the wear part can be selected to be larger than the outer diameter of the base section in order to also provide wear protection for the base section on the outer circumference side.According to one exemplary embodiment, the wearing part can be connected to the base section by at least one connecting point producing a positive fit and / or a non-positive fit. This makes it possible to ensure exchangeability of the wearing part while at the same time ensuring sufficiently good fixing of the wearing part to the base portion.According to one exemplary embodiment, the wear part is detachably fastened to the base section by a plurality of screw connections arranged in an angularly distributed manner. As a result, the wearing part can be fastened firmly, but if necessary, detachably, to the base section.According to one exemplary embodiment, a plurality of openings are provided on the base section. The openings are preferably bores which completely penetrate the base portion in a direction parallel or substantially parallel to the shaft. On the wear part, openings having a plurality of internal threads, for example in the form of blind holes, are provided. In this case, an opening of the base section and an opening of the wearing part preferably correspond to one another in such a way that a screw can be screwed into an internal thread of the wearing part in each case through the opening of the base section. As a result, a technically simple and stable fastening of the wear part to the base section can be achieved.According to one embodiment, the screw heads of the screws project beyond the top side of the base section. This has the advantage that the screw connection can be deactivated by grinding off or separating off the screw heads of the screws, which is advantageous since the screw connection, due to the use of the stirrer, frequently has material residues in curing materials, which makes conventional loosening of the screw connections impossible.According to one exemplary embodiment, a plurality of threaded bolts project upward from the wear part. A plurality of openings are provided on the base portion. The threaded bolts correspond to the openings of the base section in such a way that a threaded bolt can be passed through an opening of the base section in each case, so that the wear part can be fixed to the base section by means of a nut applied to the threaded bolt. This creates an alternative fastening possibility which in turn offers the possibility that the screw connection can be deactivated by grinding off or separating off the threaded bolts together with nuts.According to one exemplary embodiment, the wear part is made of metal, in particular a hard metal. As a result, the wear of the wear part can be substantially reduced.Alternatively, the wear part can also be made of plastic, for example hard plastic, in particular a plastic with a Shore D hardness greater than 75.The terms "approximately", "substantially" or "about" mean, for the purposes of the invention, deviations from the exact value in each case by + / - 10%, preferably by + / - 5%, and / or deviations in the form of changes which are insignificant for the function.Developments, advantages and possible applications of the invention also result from the following description of exemplary embodiments and from the figures.The invention is explained in more detail below on the basis of the figures using exemplary embodiments. The following are shown: FIG. 1 shows an example of a stirrer in a lateral, partially cut illustration; and FIG. 2 is a top view of the base section by way of example.FIG. 1 shows a stirrer 1. the stirrer 1 has a stirrer element 2 by means of which construction materials such as tile adhesives, mortars or other mixtures consisting of solids and liquid constituents can be mixed or stirred. In order to be able to set the stirrer 1 in rotation, the stirrer 1 has a shaft 3 which is of elongate design and whose longitudinal axis forms the axis of rotation of the stirrer 1.The stirrer element 2 comprises a base section 2.1 and at least one, in the exemplary embodiment shown a pair of helical sections 2.2 which project upwards from the base section 2.1 and extend around the shaft 3 in a turned manner. The helical sections 2.2 are preferably connected to the base section 2.1 in the region of their first free ends and to the shank 3 in the region of their second free ends.The base section 2.1 is formed closed in itself and runs in a plane perpendicular to the longitudinal axis of the shank 3. The shaft 3 is preferably provided centered with respect to the base portion 2.1.The connection of the shaft 3 to the base section 2.1 is preferably effected via a transverse strut 2.3 which runs perpendicularly or substantially perpendicularly to the shaft 3. The cross strut 2.3 is preferably connected on the free end side in each case to mutually opposite regions of the base section 2.1. This ensures that the rotational forces introduced via the shaft 3 are transmitted to the base section 2.1.In order to increase the durability of the agitator 1, a wear part 4 is provided on the base section 2.1. The wear part 4 is arranged on the underside, i.e. on the side of the base section 2.1 opposite the shank 3, so that it comes to rest against the base region of a container during a stirring operation. As a result, the wear part 4 is first worn out by the friction and not the base section 2.1 itself.The wear part 4 can be releasably fixed to the base section 2.1 with different fastening measures and can thus be exchanged. The fastening can be produced, for example, by screwing, hooking, clamping or other force-fit and / or form-fit connections.In the exemplary embodiment shown, the wear part 4 is fastened to the base section 2.1 by means of screw connections. In this case, the base section 2.1 has a plurality of openings through which a screw 6 can be passed in each case. In the exemplary embodiment shown, a plurality of blind-hole-like openings 4.2 are provided in the wear part 4, wherein in each case one opening 4.2 of the wear part 4 corresponds to an opening of the base section 2.1. An internal thread is provided in each of the openings 4.2 of the wear part 4, so that a screw 6, which reaches through the opening of the base section 2.1, can be screwed into this internal thread and the wear part 4 is thus fixed to the base section 2.1.The screw heads 6.1 of the screws 6 preferably protrude at the top from the base section 2.1, wherein "at the top" indicates the direction in which the free end of the shank 3 is located. This has the advantage that, for replacing the wearing part 4, the screw heads 6.1 can be removed, for example by grinding, and the wearing part 4 can subsequently be detached from the base section 2.1. This makes replacement of the wear part 4 critically easier, since the stirring element 2 is frequently covered with material residues on account of a multiplicity of mixing processes and in this way a technically very simple detachment of the wear part 4 from the base section 2.1 is possible.In an alternative embodiment, it is possible for a plurality of upwardly projecting threaded bolts to be provided on the wear part 4. These threaded bolts are provided on the wear part 4 in such a way that, when the wear part 4 is attached to the base section 2.1, a threaded bolt is in each case guided through an opening of the base section 2.1, to be precise in such a way that in each case a section of the threaded bolt protrudes above the base section 2.1 on the top side. A nut can be screwed on via the protruding parts of the threaded bolts in order to fasten the wear part 4 to the base section 2.1. In this embodiment too, it is possible to release the wear part 4 from the base section 2.1 in a technically simple manner by removing the protruding part of the threaded bolt or a nut located thereon and subsequently separating the wear part 4 from the base section 2.1.As shown in FIG. 2, the wear part 4 is formed annularly, in particular in the form of a circular ring, with an inner opening 4.1. Preferably, the outer contour of the wear part 4 is adapted to the outer contour of the base section 2.1. This is to be understood in particular as meaning that the wear part 4 projects on the outer circumference side with respect to the base section 2.1, with the result that wear protection for the base section 2.1 also exists on the outer circumference side.The wear part 4 is preferably formed from metal, in particular from a hard metal. However, other materials are also conceivable for the wear part 4, for example a wear part made of plastic, in particular made of a plastic having a Shore D hardness greater than 75 (hard plastic).List of reference characters1 Stirrer 2 Stirrer element 2.1 Base section 2.2 Helical section 2.3 Cross strut 3 Shaft 4 Wear part 4.1 Inner opening 4.2 Opening 5 Screw connection 6 Screw 6.1 Screw head

Claims

Stirrer for construction materials such as tile adhesives or mortars, comprising a stirrer element (2) and a shaft (3) projecting from the stirrer element (2), wherein the stirrer element (2) has at least one base section (2.1) and at least one helical section (2.2) which, starting from the base section (2.1), runs around the shaft (3) in a manner wound at least in sections, wherein a wear part (4) is detachably fastened to the underside of the base section (2.1) opposite the shaft (3), which wear part can be exchanged if required, characterized in that the wear part is arranged such that, during a stirring operation, it comes to bear against the base region of a container in which the stirring operation takes place, such that the stirrer element is designed as a stirring basket, the base section (2.1) is formed annularly and / or peripherally closed, and the wear part (4) is formed annularly with at least one inner opening (4.1), so that the material to be mixed can be conveyed upward through the inner opening of the wear part during rotation.Stirrer according to claim 1, characterised in that the wear part (4) can be connected to the base section (2.1) by at least one connecting point producing a positive fit and / or a non-positive fit.Stirrer according to one of the preceding claims, characterized in that the wear part (4) is detachably fastened to the base section (2.1) by means of a plurality of screw connections (5) arranged distributed at an angle.Stirrer according to one of the preceding claims, characterized in that a plurality of openings are provided on the base section (2.1), in that a plurality of openings (4.2) having internal threads are provided on the wear part (4), and in that in each case one opening of the base section (2.1) and of the wear part (4) corresponds to one another in such a way that in each case one screw (6) can be screwed into an internal thread of the wear part (4) through the opening of the base section (2.1).Stirrer according to claim 4, characterised in that screw heads (6.1) of the screws (6) project beyond the upper side of the base section (2.1).Stirrer according to one of Claims 1 to 3, characterized in that a plurality of threaded bolts project upwards from the wear part (4), in that a plurality of openings are provided on the base section (2.1), and in that the threaded bolts correspond to the openings of the base section (2.1) in such a way that in each case one threaded bolt can be passed through an opening of the base section (2.1), with the result that the wear part (4) can be fixed to the base section (2.1) by means of a nut applied to the threaded bolt.Stirrer according to one of the preceding claims, characterized in that the wear part (4) is made of metal.Stirrer according to claim 7, characterised in that the wear part (4) is made of hard metal.

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