DE8231628U1 - MIXING TOOL FOR STIRRING MIXERS - Google Patents

Description

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o. z. 0190 / C2050

Mixing tool for agitator mixers

The invention relates to a mixing tool for agitator mixers with an agitator arm with metal brackets and a wear plate which forms a gap with the container wall of the mixer.

Mixing tools of this type are used, for example, in the processing of water, cement, sand and gravel into concrete or for the processing of minerals and aggregates into raw batches for the production of glass as well Used for the production of foundry molding compounds from sands and binders. The mixing tool is used in the mixers forcibly guided through the mixture to be mixed by a moving agitator arm. Because the to be processed If substances are abrasive and have a high degree of hardness, the mixing tools wear out relatively quickly and cause high costs due to business interruption and replacement. Also the use of high quality alloy Steels for the mixing tools did not give satisfactory results. Signs of wear occur especially on the edges of the mixing tools that form a gap with the side wall or the bottom of the mixer train, and are mainly through mixture components caused that penetrate into the gap, jam there and must be crushed v / ground.

It was therefore the object of the invention to create a mixing tool which avoids these disadvantages and which is simple and can be manufactured inexpensively.

This task is achieved by the features of the claims for protection solved.

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0.2. 0190/02050

According to the invention, one is made of wear-resistant Material existing plate attached to a paddle arm by an elastic intermediate layer and metal brackets. The wear plate of the mixing tool, which is guided elastically, that is to say resiliently, in this way can be expanded by expanding of the gap prevent coarse-grained components of the bulk material to be mixed from being jammed. The coarse-grained ones Components are no longer crushed in the gap between the mixing tool and the container wall or bottom, but instead they wander through the gap unsupported. Signs of wear are thus considerably reduced.

Ss is advantageous for the service life of the mixing tool if the wear plate is permanently bonded

TS with the elastic intermediate layer or, if there is a permanent bond, the metal bracket used for fastening is guaranteed with the elastic intermediate layer. This permanent bond is achieved through a partial or complete embedding of the wear plate and / or the metal holder provided for attachment to the agitator arm in the elastic intermediate layer achieved.

The elastic intermediate layer must at the same time also be wear-resistant and, through damping, convert the energy resulting from loading and deformation into dissipating heat and thus be able to dissipate it. Elastomer materials, in particular polyurethane elastomers, are particularly suitable for this.
20th

The advantage that can then be achieved is less wear and tear on the mixing tools and the associated wear Cost savings through reduced replacement requirements and shorter downtimes. Even with existing agitator mixers is a hassle-free exchange of existing only

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> ■ tools made of steel or chilled cast iron against the Mixing tools according to the invention possible.

An exemplary embodiment of the invention e mixing tool is shown schematically in the drawing and explained in more detail below.

The mixing tool essentially consists of a wear plate (6) an elastic intermediate layer (5)

.Q and a paddle arm (1) with metal brackets (2) and (4). The wear plate is positively and non-positively connected to the intermediate layer, possibly also embedded in it up to 20 mm deep and generally consists of steels of quality St 50 to St 90 or of alloyed ones

, - Steels (manganese and chromium-manganese steels) with ledeburitic Structure * They have a Brinell hardness of 250 HB and more.

The metal brackets provided for fastening the wear plate (6) and the elastic intermediate layer (5) (2) and (4) are also made of steel, with a metal bracket (4) on the intermediate layer adjacent to this or can also be integrated in the intermediate layer. For altitude and / or 2_ Side adjustability of the Misoh tool has the the metal bracket (2) elongated holes (3) connected to the agitator arm (1).

The present invention is particularly based on the y. excellent properties of the plastics selected for the elastic intermediate layer, namely their high tensile strength, hardness and abrasion behavior. In a preferred embodiment of the invention, the intermediate layer consists of a polyester-polyol

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^r and naphthylene diisocyanate produced polyurethane elastomer with the following properties:

Hard 5 density resilience Abrasion Druckverformüngsrest RT

X) Draw.

Shore 9J> A DIM 53505 1.26 g / cm ³ DIN 53550 60 N / mm DIN 53515 60 now DIN 53516 30% DIN 53517

Claims (3)

S chut ζ claims 1. Mixing tool for agitator mixers with an agitator arm with metal brackets and a wear plate that forms a gap with the container wall of the mixer, characterized by an elastic intermediate layer (5) as a link between the metal bracket (2) and the sealing plate (6). 2. Mixing tool according to claim 1, characterized in that the metal holder (4) and / or the wear plate (6) is / are partially or completely embedded in the elastic intermediate layer (5). 3. mixing tool according to claims 1 and 2, characterized in that the elastic intermediate layer (5) consists of a polyurethane elastomer. 0190/503/82 Wr / Ke 10.11.1982