EP1239977B1 - Separating device comprising a screen lining - Google Patents

Abstract

A device for separating undesirable oblong and/or curved pieces of scrap from a scrap flow or scrap pile with a higher density, such as chill scrap, by means of an oscillating or shaking screen (1) includes a screen base (2) with a plurality of parallel guide bars (4) running in the longitudinal direction and a plurality of separating bars (3) which present openings (3.2) whose longitudinal and transverse cross-sections have different geometric shapes.

Description

The invention relates to a device for separating undesired elongated and / or curved scrap pieces from a scrap stream or scrap pile with a higher density With the help of a screen in a vibratory conveyor.

State of the art

According to DE 33 19 032 C2, a device for classifying an undesired sieve has already been made Metal chips containing coarse material with the help of one with transverse slits provided vibrating or vibrating screen proposed, in which the screen bottom with in Conveying direction longitudinal grooves is provided. The longitudinal grooves have one trough-shaped cross section with a defined flank angle on or Groove cross-section corresponds to an isosceles triangle standing on the tip a defined tip angle.

With this known invention, a selective sorting of the coarse material and a largely uniform bulk density of the sieve passage enables. The screenings or the coarse material should initially be given an orientation transverse to the direction of the sieve gaps to ensure a length-dependent sieve passage for later pressing dimensionally stable chip briquettes.

It seems obvious that such a device also for sorting out so-called Fishing, i.e. unwanted elongated and / or curved scrap pieces of refrigerated scrap, i.e. a scrap stream of higher density. The connections in however, the latter scrap stream is different from that in a metal chip pile unwanted coarse material.

Elongated or curved scrap pieces are undesirable in refrigerated scrap because they negatively affect the bulk properties of the goods. Another disadvantage is the formation of low density nests in the feeders of the steelworks, where this cooling scrap is used.
If one were to feed the previously characterized device for sieving with this unsorted refrigerated material pile for separation, the hoped-for effect would not be achieved because, due to the given geometric design of the sieve covering, no separation of the so-called fish can take place.

Presentation of the invention

The invention is therefore based on the task of sorting out the so-called fish from cooling scrap with a suitable sieve covering in a conventional vibration or Realize vibrating screen in which the separating elements are designed and arranged so that the so-called fish, i.e. the unwanted elongated and / or curved scrap pieces aligned on the one hand and on the other hand by the more rounded and denser ones desired Scrap pieces are separated.

According to the invention, this object is achieved by the features of claims 1 and 2.

The invention is illustrated by an embodiment according to the drawing described.

Brief description of the invention

Fig. 1

den Längsschnitt durch den in ein Schwingsieb angeordneten Siebboden,

Fig. 2

die Draufsicht nach Fig. 1,

Fig. 3

den Querschnitt nach Fig. 1 und

Fig. 4

a) die Einzelheit y nach Fig. 3,

b) die Einzelheit z nach Fig. 1.

Show it

Fig. 1

the longitudinal section through the sieve bottom arranged in a vibrating sieve,

Fig. 2

1,

Fig. 3

the cross section of Fig. 1 and

Fig. 4

a) the detail y according to FIG. 3,

b) the detail z according to FIG. 1.

Best way to carry out the invention

1 to 3 is in a vibrating screen 1 with vibration generators 1.1 and resilient bearings 1.2 a screen 2 arranged as a flat floor. The direction of funding of the scrap stream or scrap heap to be separated, not shown, is shown in FIG indicated by the arrow, it being understood that the main ones rounded and denser scrap pieces pass through the openings 3.2 of the screen covering 2.

The screen covering 2 is a grid-like frame made of several, parallel, transverse to the conveying direction running dividing strips 3 and several, parallel, running in the conveying direction Guide strips 4 are formed, the guide strips 4 on the separating strips 3 projecting over them seated. Geometries, cross sections and openings 3.2 are formed as they are 4 according to the details of y and z.

In front of the screen covering 2 is a closed, level floor 5 with the unsorted Scrap stream distributing feed bars 5.1.

The task-related effect sought by the invention results from the simple yet experimentally proven and surprising peculiarity that on the one hand the expediently formed from angle steel, seated on the dividing strips 3 Guide strips 4 have flat longitudinal strips 4.1 attached to the free angle legs, the distance between them on the free long sides is less than the distance on the Joining points to the angled legs. This results from the top according to FIG. 4a) openings 3.2 widening below with a trapezoidal cross section. On the other hand, point to Achieve the task-oriented effect of the transverse dividing strips 3 in the previously described openings 3.2 protruding flank approaches rising in the conveying direction 3.1, so that, according to FIG. 4b), the openings 3.2 have a parallelogram-like cross section form. This different cross-sectional geometry essentially determines the inventive one Effect that is described functionally below.

A cooling scrap stream, not shown, which is fed to the bottom 5 and which is not shown, essentially rounded scrap pieces and annoying elongated and / or curved Pieces of scrap, the fish, reach the previous one via the distributing feed bars 5.1 screen covering 2 shown in the design.

With the cooling scrap flow running in the conveying direction, the guide strips 4 effect on the one hand the alignment of the elongated and / or curved shot parts, the fish, on the other others are collected / stowed by the flank approaches 3.1 rising in the conveying direction the rounded and denser scrap pieces between the longitudinal bars 4.1 reached, which in turn causes the fish to "float". different The friction behavior of the rounded scrap pieces against each other compared to the elongated ones Fishing favors the "floating" of the same. This creates the desired separation effect achieved. By the downward widening, formed by the longitudinal strips 4.1 Openings 3.2 become jammed of the rounded ones passing through the openings 3.2 Prevented scrap pieces. The flank approaches 3.1 of the separating strips 3 prevent braking or hooking the unwanted, even curved fish, which consequently over the screen 2 "swim" until the discharge. The openings 3.2 according to the invention prevent jamming in the conveying direction and in particular threading the fish. An additional rear wall 3.3 counteracts the effort that long pieces of scrap a function-related backward movement of the fundamentally funded forward Fish get into the openings 3.2.

Industrial applicability

Due to the advantageous constructive design according to the invention and technologically favorable Manufacturing separators is the industrial applicability of the device and its Guaranteed economic success in separating the unwanted scrap pieces.

LIST OF REFERENCE NUMBERS

1 =

vibrating Screen

1.1 =

vibrator

1.2 =

spring bearing

2 =

Screen lining

3 =

disconnectors

3.1 =

edge approaches

3.2 =

opening

3.3 =

rear wall

4 =

guide rails

4.1 =

longitudinal strips

5 =

ground

5.1 =

feed bars

Claims (2)

1. A device for separating undesired oblong and/or curved pieces of scrap from a scrap flow or scrap heap of fairly high density such as cooling scrap with the aid of a screen lining in a swinging or shaking screen, wherein the screen lining substantially consists of a plurality of parallel guide strips running in the longitudinal direction and a plurality of parallel separating strips running in the transverse direction as well as a grid-like frame formed thereby with openings for the material passing through, characterised in that

   a) the guide strips (4) sit on the separating strips (3), projecting above them,

   b) the guide strips (4) formed of angular material have longitudinal strips (4.1) attached to or continued at the free angle sides, whose spacing with respect to one another at the free longitudinal sides is smaller than the spacing at the free angle sides, so that openings (3.2) expanding from top to bottom, seen in the cross-section of the longitudinal strips (4.1), having a substantially trapezoidal cross-section are obtained,

   c) the transversely running separating strips (3) have flank attachments (3.1) which protrude into the openings (3.2) and ascend in the direction of conveying of the undesired scrap pieces so that, seen in the cross-section of the separating strips (3), the openings (3.2) form a parallelogram-like cross-section and

   d) thus the openings (3.2) are defined both by the opposing longitudinal strips (4.1) and by the opposing flank attachments (3.1).
2. The device according to claim 1 characterised in that each opening (3.2) is provided with at least one rear wall (3.3) at the flank attachment (3.1).

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