DD294211A5 - DEVICE FOR ADJUSTING AND ADDING FIBERS IN THE MANUFACTURE OF FIBER SOURCES OR CONCRETE - Google Patents

Abstract

The invention relates to a device for separating entangled fibers for the production of fiber tow or concrete, which is preferably used in the building materials and construction industry. The fibers are added in metered quantity to the device, pneumatically fluidized, with existing fiber aggregates peeling away on lamellar spider web-like rigid tools. The fibers leave the device in isolated form and are introduced directly into the mixing machine or into the mold filled with a concrete layer without intermediate storage {fiber tow and concrete; Fiber separation; Fiber addition; Fiber Dosage}

Description

For this 1 page drawings

Field of application of the invention

The invention relates to a device for separating and adding fibers, which felt after cutting to the required length or during storage entangled with each other.

For the production of quality-compatible fiber mortar or concrete is in a number of mixing or processing techniques, eg. P. forced or free-fall mixers, the fiber addition in isolated form a basic requirement.

Characteristic of the known state of the art

Are known devices and methods for the production of fiber composites, in which the fibers are supplied in metered quantity without prior separation of a mixing device and dissolve existing aggregates by a high intensity of the stirring or percussion, this procedure due to the extreme mechanical stress of the fibers only can be applied to selected fiber materials, such. As in asbestos fibers that cause a reinforcing effect in the component with a very short fiber length. There are developments that fiber aggregates prior to introduction into a mixer o. Ä. In special devices that operate according to mechanical principles, preferably with rotating brush or drums and vibrating screens, e.g. DE OS 3307341, DE AS 2613019, DE OS 2635866, dissolve and reveal the suitability usually only for steel fibers. Another method that is characteristic of fiber-binder spraying is shown in DE OS 2525300 and has a low productivity.

From the textile industry, solutions for separating fibers are known, which are characterized by a high technical complexity or by a complicated technique and which are used in preferably flake-like materials, e.g. DD PS 61966, DE AS 1114127, DE AS 1078909, wherein the singling mostly by means of rotating comb-like tools, fangs o. Ä. For a number of types of fibers used, e.g. As polypropylene are the o.g. Method due to the specific material properties in connection with the required fiber length not suitable.

Object of the invention

The aim of the invention is an effective singulation and addition of fibers to mortar or concrete. The invention is intended, under industrial conditions, to eliminate the known disadvantages in the production of fiber mortar or concrete, in particular the formation of fibrous doughs, and thus enable a more effective, quality-appropriate production.

Explanation of the essence of the invention The invention is based on the object, a device for singling together felted fibers and their

subsequent addition of mortar or concrete to develop, which with reasonable effort, the production of a homogeneous mixture of fibers and mortar / concrete zulfiOt.

According to the invention the object is achieved in that the metered amount of fibers of a container-like Separation device is supplied. On the inner wall of this device are rigid in one / more planes Tools mounted in a laminar and cobweb style. The height of the tools and the distance of these from each other is

equal to or greater than the length of the fibers.

The filling opening located in the lower part of the container is closed with a sieve, under which are air nozzles, the

preferably are movable, are. In the upper part of the container is the outlet opening with a direct

Supply of the separated fibers to the mixer or to the mold.

By introducing into the lower container opening variable compressed air, the fibers are pneumatically and depending on the degree of matting cyclically or continuously fluidized, which dissolve existing fiber clusters on the rigid tools. The fibers leave the device in isolated form and are introduced directly into the mixing machine or into the mold filled with a concrete layer without intermediate storage.

embodiment The invention will be explained in more detail below using an exemplary embodiment. The accompanying drawings show

Fig. 1: Schematic representation of the separating device; Vertical section Fig. 2: as above; Horizontal section.

The metered, partially or completely entangled amount of fiber is through a closable filling opening 6, dta itself

is located below the rigid tools 2, introduced into the container 3. Due to gravity, the matted ones accumulate

Fibers 1 on the wire 6, under which the movable air nozzles 5 are located. The separation takes place by the stirring up of the entangled fibers 1 compressed air 8 by agglomerations

lamellar, spider-web-like in one or more levels in the container 3 mounted rigid tools 2 dissolve.

The height of the tools 2 and the distance between them is equal to or greater than the length of the fibers. Depending on the degree of matting of the fibers 4, the singulation process can be cyclic or continuous with batchwise

variable air pressure. The movable air nozzles 5 allow oin complete emptying and a local

Concentration of the air flow to defined points in the container 3. The separated fibers 4 align themselves in air flow and

leave the container 3 through the outlet opening 9. In a transport line 10, the fibers 4 are pneumatically to

Conveyors or conveyed to the mold and introduced there directly.

Claims (4)

1. A device for separating and adding fibers in the production of fiber mortar or concrete, which operates pneumatically, characterized in that from the inner wall of the container-like device (3) in one or more planes rigid tools (2) are arranged lamellar and spider webs , wherein the height of the tools and the distance of these from each other equal to or greater than the length of the fibers (4). 2. Apparatus according to claim (1), characterized in that for the cyclical or continuous transport with variable air pressure below the lower filling opening of the container (3) movable air nozzles (5) are arranged. 3. Apparatus according to claim 1, characterized in that above the movable air nozzles (5) a sieve (6) is arranged, whose mesh size is substantially smaller than the length of the fibers (4). 4. Apparatus according to claim (1), characterized in that in the upper part of the container (3) located outlet opening (9) has a direct supply line for metered direct delivery of the fibers to the mixer or the mold.