FR2629065A1 - DEVICE FOR SUPPLYING A SCREENING DRUM - Google Patents

Abstract

For the supply of a screening drum 6, a vibrating conveyor 5 is associated with a chute 9 adapted to the section of the screening drum 6 and having a rounded contour downwards and makes it possible to introduce into the screening drum 6 a mixture of materials containing both long parts and fragile hollow bodies, in particular bottles.

Description

The invention relates to a device for feeding a screening drum.

  In the screening drums in question, household waste from the so-called "green mass", mixed debris from building sites and also industrial waste containing wet materials is screened so as to separate the mixture of materials introduced

  in fractions, fine, coarse and medium, then recuperated

  handle most reusable materials.

  To feed a screening drum, it is

  known (DE-A j 102 846) to introduce the mixture of ma-

  third by a hopper associated with a chute which

  follows and enters the drum. The mixed debris

  gages from construction industry sites that arrive with rubble, especially in the case of building repairs, and include a high proportion of recoverable materials, such as wood, metals, stones, sand and combustible materials such as wood, textiles, paper, plastics, stacked wood and products

  analogues, pose, due to the presence, in the met

  a wide range of materials, many fairly long elements, such as pieces of wood, strips and elongated stones over two meters in length, are major problems. Even when the diameter of the screening drum is fixed, taking

  account of the length of the objects in question, to a di-

  mension which can reach four meters, the bulky pieces cause walking incidents from the stage of their feeding into the screening drum. Indeed, while the screen of the drum must rotate about a substantially horizontal axis, the supply of materials, to be economically advantageous, can only take place vertically from the top in a hopper-shaped tank. However, in a tank of this type, bulky -2- materials often cause snagging and

  blockages which can only be eliminated very diffi-

  by hand, which requires a stop.

  Furthermore, it is not excluded that the long and flexible elements curl or are deflected and, if their dimensions are smaller than those of the screen holes, pass through the screen and are the source of great difficulties and d 'walking incidents during the fine sieving which takes place as a result. These drawbacks highlighted in the case of debris

  mixed from the construction industry E'obser-

  wind in a similar way in the case of waste

  industrialists who, together with humi-

  , contain elongated elements, such as pallets, boards, etc. The feeding of a screening drum by a

  hopper associated with a chute which follows it pre-

  There are also difficulties in the case of household waste from the "green mass". The mixture of materials from the green mass is a starting material which has already been subject to prior classification.

  and which no longer contains fruit and vegetable waste

  mes or similar culinary products, ash or

  of similar materials. Materials that have been previously

  separately separated and classified on the spot essentially include fragile hollow bodies, in particular

  glass bottles, paper, cardboard, containers

  pients and sheets of plastic, metals,

  textiles, wood, leather and the like.

  3U During loading into the screening drum, this

  a wide range of materials is subjected to a strong acceleration resulting from the inclination of the chute, so that the glass bottles, in particular, are generally broken upon arrival in the drum, which constitutes a considerable gene for their subsequent classification.

  according to the colors which is done by hand. The in-

  comparable conveniences: to those just mentioned

  and resulting from great heights of fall

  are also used when the mixture of pro-

  coming from the green mass is brought by a conveyor belt.

  The object of the invention is the realization of a dis-

  positive which eliminates the drawbacks in question for feeding a screening drum with a mixture of materials containing, in particular, elements of fairly

  great length and / or fragile hollow bodies.

  This object is achieved according to the invention, because the device comprises a vibrating conveyor associated with a chute which is adapted to the section of the screening drum and has, downwards, a rounded outline, preferably in the form of a trough. Because of the outline which, according to the invention, presents the chute, which is preferably open in the direction of transport and which, by its front end, penetrates into the screening drum, the edge. of the material mixture spill is brought to the most advanced point possible. The part of the trough in the shape of a trough which enters

  the drum screen is not separated from the surface of the drum

  inner screen of the drum screen only by a

  ble distance, in the radial direction, sufficient to allow

  be the vibrations of the chute; in the case of a drum diameter of two meters for example, the maximum width of the trough in the shape of a trough is 1.8 met

  its distance in the radial direction is 10 cm.

  Because the trough in the shape of a trough is suitable

  around the screening drum and enters it concentrically

  In addition, not only the drop height of the material mixture introduced into the screening drum is reduced to a value which does not involve any risks with regard to the breakage of glass bottles, but also _ 4- opening the feed is unobstructed and almost corresponds to the total section of the screening drum. This arrangement means that large bulky pieces can easily enter the screening drum, even when they go beyond the edge

  upper trough-shaped chute. The introduction

  tion in the screening drum of a mixture of materials

  including large pieces of large length

  two meters and more, therefore, does not require a screen drum of special construction which has a diameter increasing the size and which requires greater power for its drive, because, due to the vibrations of the chute in the form of trough, the

  mixture of materials is previously oriented, that is

  that is to say that during transport in the trough in the shape of a trough the bulky and / or heavy elongated pieces are placed so that their largest

  length is oriented in the direction of transport.

  Because the transport of the mixture of materials is ensured by vibrations caused by unbalance motors, that is to say that it is not necessary that the trough in the shape of a trough has an inclination which accelerates the displacement of the material mixture, the glass bottles are introduced gently and without

  be broken in the screening drum.

  Instead of a trough in the shape of an arge

  round, you can use a chute with a con

  polygonal tower. However, the chutes whose contour has a section approaching the half-circumference

  ensure particularly regular transport.

  It is advantageous that the bottom at least of the gou-

  monkfish is covered internally with a material

  non-slip shock absorber. It is particularly advantageous

  geux, for example, to use a coating of rubber or plastic which can also extend on the inner side walls of the chute. This coating has the effect not only of attenuating, during the transport of the materials, the noises due to

  example of rolling bottles or mete

  metal, but at the same time, as a result of the improved adhesion, to have an advantageous influence on the

transport of materials.

  The invention is described below in more detail by means of an exemplary embodiment in

referring to the drawing.

  Figure 1 is a side view of a classification and screening installation which comprises a transport chute according to the invention mounted upstream of the screening drum Figure 2 is a perspective of the front end of an associated screening drum to a vibrating transport chute according to the invention which penetrates into

the screening drum.

  Figure 3 is a section along line III-III

in Figure 2.

  To recover materials, a mixture of materials, not shown, is poured into the

  loading 2 of a classification system 1 shown

  partially felt, on a conveyor 3 which brings the mixture of materials on an ascending conveyor 4 which ends above a vibrating conveyor 5. The vibrating conveyor 5, which brings the mixture of materials into a screening drum 6, comprises at minus an engine

  with unbalance7 which moves, according to vibrations determined

  mined, the chute 9 (see Figure 2) which is supported and can move on the spring buffers 8 and, therefore, ensures the movement of materials in the direction 10 of their transport. The vibrating conveyor 5 and the screening drum 6 are both placed above the bottom or the base 11 on support beams 12 and -6 -

  it is possible to access it by a staircase

  health at a platform 13. Above the screening drum

  6, the device comprises balls 15, '16 which evacuates

  cook fine and coarse fractions with trar: s-

  separate carriers 17 for possible further processing. As indicated in FIGS. 2 and 3, the chute 9 of the vibrating conveyor 5 which ensures the loading of the screening drum 6 is a trough in the form of a trough and has a contour adapted to the section or to the shape of the screening drum. Trough 9, which is open in

  the direction of transportj exceeds by its anterior end

  in the screening drum 6 in such a way that:

  there is (see Figure 3) in the radial direction, between the over-

  inner face 19 of the screening drum 6 which has many holes 20 and the chute 9, a small space

which allows vibrations.

  During transport of the material mixture in

  the chute 9 in the direction of transport 10, the vibra-

  tions produced by the unbalance motor 7 orient the particularly long elements in such a way that they are transported lengthwise and without deviation in the screening drum. Due to the semi-circular shape of the section of the chute 9, its internal diameter alone delimits a feed opening (see Figure 3); even elements which extend far beyond the upper edge 21 of the chute 9 do not cause jamming and / or snagging,

  whether in the chute 9 or in the drum 6.

  As, moreover, the height of fall, that is to say the path that the mixture of materials must travel between the discharge edge 22 located at the front end of the chute 9 and the zone where the mixture arrives on the internal surface 19 of the casing of the screening drum 6 is small, since it is equal to the distance 18, there is no risk of breakage for bodies

  fragile hollow like glass bottles.

Claims (5)

  1. Device for feeding a screening drum, characterized by a vibrating conveyor (5) associated with a chute (9) adapted to the cross section of the screening drum (6) and having a rounded contour downwards. 2. Device according to claim 1, characterized by a trough (1) in the shape of a trough.   3. Device according to one of claims 1 or 2, charac-   terized by a trough (9) in the shape of a trough having a polygonal outline.   4. Device according to one of claims   1 to 3, characterized in that the trough (9) in the shape of a trough, open in the direction of transport (10),   enters the screening drum (6).   5. Device according to one of claims   i to 4, characterized in that the bottom at least of the   chute (9) is internally covered by a material riau non-slip shock absorber.