DE295749C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 295749 CLASS BOa. GROUP

GEBR. RANK in MUNICH.

Mixing device, in particular for concrete.

Patented in the German Empire on November 20, 1914.

Mixing devices, especially for concrete, in which a drum is made from inside Sheet metal strips or gutters of existing mixing blades are attached in opposite directions are that when rotating the drum, the mix is shifted or moved in a zigzag path on the circumference of the drum, are known.

The invention relates to a mixing device

ίο of this type, in which, however, by a Improving the mixing blades a more effective and faster mixture is achieved.

The essence of the invention consists in the fact that each mixing paddle is two opposite forms directed parts which are bent apart and arranged to each other that the mix when going up the First the wing down on the outer wing part, then laterally on the inner wing part and now slides back on the inner wing in the opposite direction before the same thing falls on the next wing. If such mixing blades are known per se multi-chamber mixing drums are attached, there is the advantage that even with relatively short chambers an extremely effective and rapid mixture is achieved.

In the drawing, two embodiments of the subject matter of the invention are illustrated in FIGS. 1 and 2, each in a longitudinal section through the mixing drum.
• On the inner wall of the rotatable mixing drum α are z. B. four over the circumference distributed mixing blades b attached (Fig. 1), each consisting of two parts by being split and bent apart in such a way that two oppositely directed wing parts c and d arise.

The mutual position of the wing parts c and d is such that the mix slides on the outside of the drum wall lying wing parts c when climbing these parts in the direction of the arrows, then, as soon as the horizontal center plane is exceeded, in the direction of the arrows 2 to the inner Wing parts d crosses and finally, when going up on this, slides back in the direction of arrows 3 until it falls off. Through the outer parts c of the blades, the mix is taken up approximately to the horizontal center plane of the drum, then passes over to the inner blades d and slides along them in the opposite direction until it comes earlier, depending on their greater or lesser radial width or later drops inwards. As a result, an intimate and thorough mixing is achieved using the simplest means until the material to be mixed is removed from the drum by any means known per se.

Such mixing blades can also be attached several times one behind the other, with the successive rows of mixing blades if necessary through partitions from one another can be separated, which divide the mixing drum into consecutive chambers.

Such an embodiment is shown in Fig. 2 in a vertical longitudinal section through a j for example two-chamber mixing drum a .

In the front chamber e mixing blades are mounted like those according to FIG. Ι and in the rear chamber f blades which are each provided with a ploughshare-like jaw g behind the division point of the wing parts c, d. The latter catches part of the mixed material sliding backwards from the shovel parts c and guides it to the sliding surfaces. This will make the effect

ίο the sliding surfaces still increased.

If the mixing drum consists of two or more chambers in the manner indicated, z. B. when mixing concrete, the front chamber α for dry or "premixing" and the following chamber f for wet or "finished mixing". In this case there is a water supply h only in the rear chamber.

The transfer of the mixed material from the front chamber e into the rear chamber f can be done by a transfer device, which consists, for example, of a feed cone k adjustable towards the passage opening i and of scoops I , the latter sitting radially on the partition wall m and designed in this way that they lead the mix scooped from the front chamber on top of the feed cone. From this it slides, depending on whether the cone k is more or less closer to the opening i , in a smaller or larger amount into the rear chamber f . The adjustment of the cone k can take place by means of the displaceable shaft 0 and the lever η .

To feed the material to be mixed to the mixing blades of the front chamber, for. B. serve a rotating annular transition channel p , which by means of openings q, which are distributed over the inner conical circumference r of this channel, removes the material to be mixed from the feed hopper s . The same falls through the openings q into the channel f and is fed therefrom as a result of the conical surface r and further inclined partition walls u through several openings t in the front drum wall of the chamber e .

Claims (2)

Patent Claims: 1. Mixing device, especially for concrete, with oppositely directed mixing blades mounted inside the mixing drum, characterized in that each mixing blade (δ) consists of two oppositely directed parts (c, d) which are bent apart or arranged to one another that the mix when ascending the wings first descends on the outer wing part (c), then laterally down onto the inner wing part and now slides back on the inner wing (d) in the opposite direction to fall onto the next wing. 2. Mixing device according to claim 1, characterized in that the mixed flight egg (δ) behind the dividing point with one each of the return movement of the mix supporting ploughshare-like jaw (g) are provided. 1 sheet of drawings.