FR2520399A1 - VIBRATING BARS FOR REINFORCING STATION - Google Patents

Abstract

1. Bars for an enrockment station in the form of a box girder (1) of large-dimension sheet metal having a trapezoidal longitudinal section, and inclined with respect to the horizontal from the large side towards the small side, their cross-section being of roof-shape, characterized in that they are each provided with one and preferably with two motor-driven vibrator units (2) imparting to them a vibratory movement with vertical acceleration, and in that they are mounted on resilient elements (3) in the form of rubber blocks mounted on pillars (4) for fixing to the structure of the enrockment station and fixed to the interior of the upper portion of the box girder (1) by means of crossbars (5).

Description

The present invention relates to the field of screening

  granulometry elements in rockfill sites, and relates to vibrating bars for

such stations.

  At present, the known riprap stations are generally provided with parallel trapezoidal static bars, on which is poured a quarry of great size, which is screened

  to the dimensions required for its use.

  However, the static bars of various shapes and sizes used to date have the disadvantage of

  not to avoid the doweling of large granules

  lometries and thus the disadvantage of hindering a

  correct installation of rockfill stations.

  The present invention aims to overcome this disadvantage. It has, in effect, rockfill station bars characterized in that they are in the form of a large sheet metal box having a trapezoidal longitudinal section, and are inclined with respect to the horizontal of the large side towards the short side, their cross section being roof-shaped, in that they are each provided with one, preferably two motor-vibrators groups conferring a vibratory movement with vertical acceleration, and in that they are mounted on

elastic elements.

  The invention will be better understood thanks to the description

  hereinafter, which relates to a preferred embodiment,

  given as a non-restrictive example, and explained with reference

  FIG. 1 is a side elevational sectional view of a bar according to the invention; FIG. 2 is a plan view according to FIG. 1; FIG. 3 is a sectional view along AA of FIG. 1; FIG. 4 is a sectional view along BB of FIG. 1, and FIG. 5 is an elevational view. front of the bar

Figure 1.

  According to the invention, and as show more

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  In particular, by way of example, FIGS. 1 and 2 of the appended drawing, the bar for riprap station is in the form of a box 1 made of sheet metal of large size, which has a trapezoidal longitudinal section (FIG. 2). bar is inclined to the horizontal, from the long side to the short side, its cross section is in

  form of roof, and it is provided with two motorized groups

  vibrators 2 which give it a vibratory movement with vertical acceleration, which is made possible thanks to a

  mounting the casing 1 on elastic elements 3.

  The elastic elements 3 are advantageously rubber blocks mounted on pillars 4 for fixing on

  the structure of the rockfill station and attached to the

  of the upper part of box 1 through

sleepers 5.

  The motor-vibratory groups 2 are mounted inside the

  1 of the casing 1, advantageously forming a working angle with the roof 1 'of the latter of about 30, and are provided with flying-unbalances whose cut can be varied

manually from 0% to 100%.

  The engines equipping the groups 2 preferably have a power of between 3.2 Kw and 5 Kw, and have a natural frequency of 1000 rpm adjustable by means of a frequency converter between 500 rpm and 1 RPM. 000 rpm, so as to obtain a variable unidirectional directed amplitude, preferably

between 1.5 mm and 3 mm.

  The important working angle of the motorcycle groups

  vibrators 2 compared to the box 1 allows an advance

  by vibration of the materials to be treated whose speed of

  is a function of the slope of the bars and the acceleration

vertical position of each bar.

  In a rockfill station, these vibratory bars are advantageously five in number, and the fact that they are mounted on rubber elements 3 allows the reception of large blocks and the damping of impacts during

  dumping by dumpers, or the like.

  The opening between bars is widely divergent in order to avoid material dowelling, so that

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  their passage between said bars is greatly facilitated and a relatively exact cut of the materials is obtained. Since all the bars are mounted on elastic elements 3 and each have their own frequency, their orientation is carried out in all directions of the advancement of the materials, and to maintain a minimum spacing between bars, it is provided, according to a feature of the invention, elastic buffers 6

  mounted on the pillars 4 for fixing the casing 1 and cooperating with

  with the edges 1 "of the box 1.

  Thanks to the invention, it is possible to produce vibrating bars for rockfill stations allowing loadings of the order of 35 to 80 tons, absorbing the impacts due to loading and remaining flexible in all directions Stations thus equipped are particularly used in the construction of dams and in

  quarries for the exploitation and processing of aggregates.

  Of course, the invention is not limited to the embodiment described and shown in the accompanying drawing. Modifications are possible, in particular from the point of view of the constitution of the various elements, or by substitution of technical equivalents, without departing from of the domain

protection of the invention.

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Claims (4)

-R E V E N D I C AT IO N S-   1 Rockfill station bars characterized in that they are in the form of a caisson / sheet metal   large dimension with a trapezoidal longitudinal section   zoldale, and are inclined relative to the horizontal from the long side to the short side, their cross section being roof-shaped, in that they are each provided with one, preferably two vibratory groups (2)   giving them a vertically accelerating vibratory   wedge, and in that they are mounted on elements elastics (3).   2 bars, according to claim 1, characterized in that the elastic elements (3) are advantageously rubber blocks mounted on pillars (4) for attachment to the structure of the rock fill station and fixed inside the upper part of the box (1)   through sleepers (5).   3 bars, according to claim 1, characterized in that the motor-vibratory groups (2) are mounted inside the box (1) advantageously forming a working angle with the roof (1 ') of the latter approximately, and are equipped with flying-unbalances whose torque can   be varied manually from 0% to 100%.   4 bars, according to claim 3, characterized in that the engines equipping the groups (2) preferably have a power of between 3.2 Kw and 5 Kw, and have a natural frequency of 1000 revolutions / minute adjustable at frequency converter between 500 rpm and 1000 rpm, so as to allow a variable unidirectional preferably between 1.5 mm and 3 mm.   Bars, according to claim 1, characterized in that elastic buffers (6) are mounted on the pillars (4) for fixing the box (1) and cooperate with the edges (1 ') of the box (1).