FR2627534A1 - USE OF A SEMIAUTOMATIC DEVICE FOR SCREENING AGGREGATES ON A SITE AND METHOD OF OBTAINING SAME - Google Patents

Abstract

The invention relates to the method and device for sieving aggregates on site, making it semi-automatic. It consists in temporarily associating a Z sieve designed for this purpose and a Y concrete mixer. The sieve fixed temporarily on the mouth of the tank and taking advantage of the latter's rotation to carry out its work. Starting with raw sand F, the shovels are placed in the descending part of the sieve: trajectory B. The sieving work being done in the ascending part, the sieved sand falls into the tank D: trajectory A, ready for use. The large aggregates roll up to the lower part of the sieve, are superimposed on the next shovel, flow into the wheelbarrow E: trajectory C. The method and device according to the invention is particularly intended for building and public works sites.

Description

The present invention relates to the use of a semi-automatic device

  to sieve aggregates on site and its process of obtaining.

  Certain masonry travoux on chontier require the sieving of the sand to have a homogeneous product. All octually used processes are obsolete. The present invention makes it possible to make this work less

and increase the yield.

  Currently this work is done using a sieve consisting of a

  wooden strapping surrounding a fence and the whole is handled by hand.

  It is a hard work, of a low yield and which requires several operations of manipulation of the sand. In order to have a better performance, an inclined rectangular screen is used which rests on the ground but which

  also requires several sand handling operations. It is an appa-

  It is cumbersome and fragile, not very adapted to its transport. In both cases, two heaps of sand are obtained from the soil, one screened and the other containing large aggregates which have not passed through the sieve. Another way is to transport sieved sand from a sieving plant, but in most cases the quantities needed on site are not sufficient to justify the trucking costs.

  According to the invention the use of a semi-automatic device carocted-

  rised by the temporary fixation of a cylindrical sieve on the mouth of the

  rotating tank of a concrete mixer eliminates all these disadvantages; The return

  is improved, a single manipulation with the shovel of the aggregates is enough; the sieved sand is found inside the cement mixer ready for use, the large aggregates being loaded automatically into the wheelbarrow for

  transport them to the storage area.

  The operation consists in loading the aggregates into the concrete mixer

  normal use month or through a sieve.

  The accompanying drawings illustrate the invention: FIG. sectional view of the simple sieve pattern

  associated with a traditional concrete mixer.

  FIG. 2 represents a sectional view of the professional sieve model.

  combined with a concrete mixer.

  Figure 3 shows the area of evolution of the aggregates inside

sieve.

  Figure 4 shows all the phases of the aggregates

for sieving.

  The device according to the invention allows the following method to be used

  wise aggregates. As shown in Figures 3 and 4, the

  sitive comprises the cylindrical sieve (Z) coupled to the tank of the mixer (Y). The inclinoison of the tank thereof is about 45 to have optimum performance. The speed of rotation of the tank being that of its normal use which is between 25 and 30 rev / min. The assembly rotates in the direction of the arrow (1). Starting from the pile of raw sand (F) and following the path (B), the sieve (Z) is loaded by depositing the shovels of raw sand to sieve in the region (G) of the sieve. This sand then occupies the area (H). As a result, the groins of sand of a size smaller than the mesh of the mesh have through and fall to the tank of the concrete mixer following the quarry (A). Aggregates larger than the mesh size roll to the bottom of the sieve, overlapping with the next shovel

  and flow into the wheelbarrow (E) following the path (C).

  The device shown in Figure 1 comprises in a first variant a sieve pattern (X) composed of a rigid cylindrical body with its lower inner portion and fixed thereto the sieving cloth composed of a mesh. The sieve is incorporated partially or entirely inside the tank. It has a work surface equal to the surface of the mouth of the concrete mixer (Y). This sieve will be economical, simple form without fixing because the friction force of the rolled edge of the sieve on the rolled edge of the mouth of the mixer is sufficient to prevent slippage. The center of gravity of the vacuum or load sieve at

  the interior and below its support surface prevents it from tipping over.

  This model is mainly reserved for traditional concrete mixers for

  craftsmen masons and masonry enthusiasts.

  Some vats of concrete mixers have mixing palettes whose height does not allow the partial introduction to the complete body of the sieve, in this case the sieve will be external and fixed temporarily in three

points on the rim of the tank.

  The device shown in Figure 2 comprises in a second variant a more elaborate sieve (Z) having a larger work surface for improved performance. It is connected to the tank by a

  frustoconical interface and equipped with a quick three-point attachment.

  This model is mainly reserved for professionals in masonry companies. The device according to the invention highlights the advantages of this method: an easy and fast implementation of the assembly, a sieving of aggregates just in the necessary quantity, a single manipulation of the sand at the

  shovel suffices, thus a saving of time, of pain, of aggregates.

  The device, object of the invention, can be used in all cases

o Aggregate sorting is required.

Claims (4)

  1) Device for semi-automatic sieving of aggregates on a coroctic construction site   in that the process is the combination of a sieve (X) or (Z) and a concrete mixer (Y) rotating.   2) Device according to claim 1 characterized in that the part.   Screen sieve (X) has an equal diameter or diameter of the mouth of the tank.   3) Device according to claims 1 and 2 characterized in that the body   tomisante part of the tomis (X) are provisionally incorporated into   inside the mouth of the concrete mixer tank (Y).   4) Device according to claims 1 and 2 characterized in that the body   and the tomisante portion of the sieve (X) are located outside the mouth of the tank of the mixer (Y), the body is fixed temporarily by three points to this one.   ) Device according to claim 1 characterized in that the body and the sieving portion of the sieve (Z) are of a larger diameter or diameter of   the mouth of the concrete mixer tank (Y) and connected to it by a   frustoconical face fixed temporarily by three points to the tank.