DE2712124A1 - Mixer e.g. feeder shaft for building industry - using row of replaceable half shells bolted together and fitted with blades - Google Patents

Abstract

Mixed and/or feeder screw, for single- or double shaft worm feeders or mixers, etc. used in the building industries, has a shaft fitted with a row of interchangeable half shells which can be bolted together. A mixer blade is fitted on the periphery of each half shell. Each half shell is pref. fitted with an internal strap used with nuts and bolts to bolt two half shells together to make a ring. The shaft is pref. fitted with two flanges, of which >=1 can be removed, for clamping a row of pairs of the half shells on the shaft. Used for mixing asphalt, or mixt. contg. hydraulic binders. The feeder or mixing blades are easily and rapidly replaced, and the shells have a smooth periphery.

Description

"Mixing or conveying shaft with prismatic transverse

cut that with individual, interchangeable tools to achieve a mixing or conveying effect is provided.

The invention relates to a mixing or. Conveyor shaft with prismatic Cross-section with individual, interchangeable work equipment to achieve a Mixing or conveying effect is provided, for equipping single or double-shaft mixers, appropriately trained screw conveyors or twin mixing screws or the like. For the preparation of building material mixtures.

For the production of asphalt mix as well as hydraulically Bound mix is often used with Zveivellen compulsory mixers, often with these can be controlled adjustable in given areas of power and mixing intensity. This also applies to a limited extent to the so-called single-shaft mixers which the goods by appropriate position of the work equipment, i.e. the mixing blades Or the like. Repeats a shorter distance back and forth in sections a longer distance is conveyed in the working direction, whereby this single-shaft conveying and mixing screws generally only if there is a longer mixing section work satisfactorily.

In such mixers - also in vertical stirrers, e.g.

according to the German patent 1 244 634 - is the wear and tear on the work equipment, i.e. at the mixing or conveying organs to a large extent depending on whether and how long Mineral parts of the mixture by more or less binders and zvar indifferent which type, is enveloped, and in what way these binders reduce the friction distribution within reduce the mixture.

Further essential factors are the circumferential speed, which decreases towards the center of the mixing elements, which approach zero, practically bring about so-called dead zones can, as well as the design and training of mixing trough and tub. In order to avoid dead zones, it was already proposed by the German patent 1 244 634, to arrange a rotxrenden filler body coaxially to the mixer shaft, its dimensions when producing bituminous material in relation to the diameter of the mixing trough about 1/3.

So much for the state of the art.

However, the known designs of this type have uniformly the Disadvantage that when there is a need to avoid dead zones or in the interest the prevention of caking, especially on the clamping and holding devices due to their functional shape, which interferes with the flow of material, filling bodies arise are required, each of which then requires the removal of the entire mixing shaft, If individual mixing elements have to be changed due to wear.

As the packing in the interests of weight saving and reduction dynamic forces are relatively easy to carry out, it is therefore necessary to to connect the work equipment directly to the shaft, since the thin jacket of a Packing body not for the transmission of forces from the mixer shaft to the working medium suitable is.

It is therefore the task of this invention to provide a mixing and conveying shaft to be named after the classification, the tools of which are easily and individually exchangeable, whose surface is smooth within the mixing area and whose cross-section is cylindrical is.

According to the invention it is provided that the shaft over its entire Scope through partially assigned and detachably connected to one another, Reinforced cylindrical half-shells encased and the individual half-shells at their periphery, at least partially, provided with mixing or conveying elements are.

This training has the advantage that the individual work equipment, i.e. the mixing or conveying tools without removing the mixer shaft from the mixer that can be removed by the stiffening of the half-shells the total weight the mixing or conveying shaft is practically not increased, since the otherwise usual Accumulations of material for the direct connection of the work equipment to the prismatic Shaft are omitted and the forces over a wide range of the circumference of the half-shells formed fillers can be transferred directly, e.g. by welding.

To stiffen the half-shells it is provided that in each case to form a closed jacket to complement half-shells with screw straps are arranged associated with each other, the joined together a the prismatic Have cross-section of the shaft corresponding free cross-section, whereby the screw tabs support the inner periphery of the half-shell several times.

To fill the filling body formed by the half-shells to avoid the flow of material, it is provided that in the two end limits grip the area covered by the cylindrical half-shells, at least one of which is releasably slidably connected to the shaft.

So much for the training of the Mischbzv according to the invention. Funding wave, which have the following advantages in summary: 1. Easy interchangeability of the individual work equipment without dismantling the entire shaft.

2. Smooth cylindrical shaft, the outer diameter of which is unstressed an additional weight compared to conventional designs according to the good behavior can be predetermined.

3. Easy to change the arrangement and assignment of the Work equipment among each other to achieve optimal effectiveness.

The invention is illustrated by the attached drawing an exemplary embodiment explained: Figure 1 shows the longitudinal view of the mixing respectively.

Funding wave.

Figure 2 shows a cross section through the Mischbzv. Conveyor shaft.

A cover plate 2 is firmly attached to a square shaft 1. On this shaft, the connected half-shells carrying the work equipment are in axial direction non-positive and radial, positive on shaft 1 attached. The lining up of the half-shells results in a smooth surface of the Working area of the shaft. The half-shells 3 and 4 each consist of the molded body jacket 5 and two screw tabs 6 connected to it, which correspond to the square shaft are welded. The two half-shells 3 and 4 are by in a known manner Nut screws guided in the screw tabs 6 are clamped onto the square shaft 1. Through the cover 8 verden by means of adjusting screw 9, the work equipment 10 carrying Half-shells 3/4 fixed in the axial direction. If the cover 8 is loosened and in the direction of the arrow shifted, so the individual half-shells, solved one after the other, can then be on the other side be shifted so much that only the half-shells to be replaced 3/4 each must be taken out.

Claims (3)

Claims mixing or conveying shaft with prismatic cross-section, those with individual interchangeable work equipment to achieve a mixed or Pumping effect is provided, for equipping single or double level mixers, accordingly trained screw conveyors or double mixing screws or dlg. for processing of building material mixtures, characterized in that the shaft over its entire Scope by means of sections that are assigned to one another and releasably connected to one another, in itself stiffened cylindrical half-shells (3/4) encased and the individual Half-shells (3/4) on their periphery, at least partially, with mixing and conveying elements are provided. 2. Mixing resp. Conveyor shaft according to claim 1, characterized in that d a ß in the half-shells to be supplemented to form a closed shell (3/4) screw tabs (6) are assigned to each other, which are joined together to the have a free cross-section corresponding to the prismatic cross-section of the shaft, wherein the screw tabs (6) support the inner periphery of the half-shell more pocket. 3. Mixing or conveying shaft according to claim 1 and 2, characterized in that d a ß in the two end limits of the through the cylindrical half-shells (3/4) encased area cover (8) grip, at least one of which is detachable is slidably connected to the shaft.