DD278958A1

DD278958A1 - BASKET FOR WINDSHIELDS

Info

Publication number: DD278958A1
Application number: DD32438288A
Authority: DD
Inventors: Hartmut Verch; Winfried Raatz; Dieter Prescher; Volker Beck
Original assignee: Dessau Zementanlagenbau Veb
Priority date: 1988-12-29
Filing date: 1988-12-29
Publication date: 1990-05-23

Abstract

Die Erfindung betrifft den Stabkorb als Zentrifugalsystem eines Windsichters mit einer Vielzahl auf seiner Mantelflaeche und vorzugsweise parallel zur Rotationsachse angeordneten Staeben, der mit hoher Umfangsgeschwindigkeit rotiert und seine Mantelflaeche von aussen nach innen von feingutbeladenen Sichtgas durchstroemt wird. Erfindungsgemaess sind die Staebe 3 in Schlitze in der Nabe 1 und im Flansch 2 eingesetzt. In Ringnute 8; 9 mit geneigten Seiten am Umfang der Nabe 1, des Flansches 2 sowie der Staebe 3 sind um die Enden des Stabkorbes je ein Spannring 10; 11 gelegt. Diese besitzen einen konischen Querschnitt und sind in mindestens zwei Segmente ausgefuehrt. Diese werden im vorgespannten Zustand durch Schweissung verbunden. Fig. 1The invention relates to the rod basket as a centrifugal system of an air classifier with a plurality on its lateral surface and preferably arranged parallel to the axis of rotation rods which rotates at high peripheral speed and its Mantelflaeche is pierced from the outside to the inside of finely-laden gas. According to the invention, the bars 3 are inserted in slots in the hub 1 and in the flange 2. In ring groove 8; 9 with inclined sides on the circumference of the hub 1, the flange 2 and the Staebe 3 are each a clamping ring 10 around the ends of the rod basket; 11 laid. These have a conical cross section and are executed in at least two segments. These are connected in the prestressed state by welding. Fig. 1

Description

Ausführungsbeispielembodiment

Die Erfindung wird am Ausführungsbeispiel näher erläutert. Die zugehörigen Zeichnungen zeigen:The invention will be explained in more detail in the exemplary embodiment. The accompanying drawings show:

Fig. 1: einen Stabkorb im Axialschnitt;Fig. 1: a rod basket in axial section;

Fig.2: einen Schnitt durch Fig. 1 entlang der Linie C-C;2 shows a section through Figure 1 along the line C-C.

Fig.3: einen Stabkorb im Einbauzustand in einem Sichter.3 shows a rod basket in the installed state in a sifter.

Der Stabkorb nach Fig. 1 und 2 besteht aus der Nabe 1, dem Flansch 2 und den Stäben 3, die alle miteinander verbunden sind. Die Nabe 1, die fest mit einem Antriebszapfen 4 verbunden ist, besitzt am Umfang gleichmäßig verteilt eine Vielzahl radialer Schlitze.The rod cage according to Fig. 1 and 2 consists of the hub 1, the flange 2 and the rods 3, which are all connected together. The hub 1, which is fixedly connected to a drive pin 4, has circumferentially evenly distributed a plurality of radial slots.

Stirnseitig ist im Bereich der Schlitze eine Ringnut eingearbeitet, in die ein Ring 5 eingesetzt und mit Nabe 1 fest verbunden ist.On the front side, an annular groove is incorporated in the region of the slots, in which a ring 5 is inserted and firmly connected to the hub 1.

Der Flansch 2 besitzt die gleiche Anzahl Schlitze wie die Nabel. Diese befinden sich zwischen Lamellen 6, die sich vom Flansch 2 aus axial in Richtung Nabe 1 erstrecken und radial schmaler sind als der Flansch 2. An den Flansch 2 ist in Richtung Nabe 1 von innen an den Lamellen 6 ein Ring 7 befestigt.The flange 2 has the same number of slots as the navel. These are located between lamellae 6, which extend from the flange 2 axially towards the hub 1 and are radially narrower than the flange 2. On the flange 2, a ring 7 is fixed in the direction of the hub 1 from the inside to the fins 6.

Die Enden dar Stäbe 3, in die den Ringen 5; 7 angepaßte Aussparungen eingearbeitet sind, werden in die Schlitze an Nabe 1 und Flansch 2 eingesetzt, wobei die Aussparungen in den Stäben 3 über die Ringe 5 und 7 greifen. Nabe 1 und Flansch 2 werden axial zusammengespannt, wobei die Ringe 5; 7 die Stäbe 3 radial fixieren.The ends of bars 3, in which the rings 5; 7 adapted recesses are incorporated, are inserted into the slots on the hub 1 and flange 2, wherein the recesses in the bars 3 via the rings 5 and 7 engage. Hub 1 and flange 2 are clamped together axially, the rings 5; 7 fix the rods 3 radially.

In diesen so vormontierten Stabkorb werden am Umfang konische Ringnute 8; 9 im Bereich der Schlitze in Nabe 1 und Flansch 2 eingearbeitet. In diese Ringnute 8; 9, deren Wände eine Neigung von vorzugsweise 15° besitzen, werden aus mindestens zwei Segmenten bestehende Spannringe 10; 11 mit konischem Querschnitt eingelegt. Die Enden der Spannringe 10; 11 werden im vorgespannten Zustand verschweißt. Die beim Erhalten der Schweißnähte entstehende Schrumpfspannung preßt die Spannringe 10; 11 in die Ringnute 8; 9, wodurch eine feste, formschlüssige Verbindung entsteht, die dem Stabkorb genügend Stabilität verleiht.In this so pre-assembled rod basket conical annular groove 8; 9 incorporated in the region of the slots in hub 1 and flange 2. In this annular groove 8; 9, whose walls have an inclination of preferably 15 °, are made of at least two segments existing clamping rings 10; 11 inserted with conical cross section. The ends of the clamping rings 10; 11 are welded in the prestressed state. The resulting in obtaining the welds shrinkage pressure presses the clamping rings 10; 11 in the annular groove 8; 9, creating a strong, positive connection, which gives the bar basket sufficient stability.

Dieser Stabkorb wird nun vorzugsweise mit horizontaler Rotationsachse in den Sichtraum eines Sichters 12 (Fig. 3) eingebaut.This rod basket is now preferably installed with a horizontal axis of rotation in the viewing space of a classifier 12 (FIG. 3).

Aus seinem Innenraum 13 wird über eine Abzugsleitung 14 das feingutbeladene Sichtgas abgezogen. Die Abdichtung zwischen dem sich drehenden Stabkorb und der feststehenden Abzugsleitung 14 erfolgt über ein Labyrinth, zu dem der an den Flansch 2 angearbeitete Ring 15 gehört (Fig. 1 und 2). Ebenfalls an den Flansch 2 angearbeitete Schaufeln 16 wirken als Lüfterund bauen am gesamten Umfang e^:n Luftpolster im Labyrinth auf.From its interior 13, the fines-laden viewing gas is withdrawn via a discharge line 14. The seal between the rotating rod basket and the fixed discharge line 14 via a labyrinth, to which the attached to the flange 2 ring 15 belongs (Fig. 1 and 2). Also worked on the flange 2 blades 16 act as a fan and build on the entire circumference e ^: n air cushion in the labyrinth.

Die Vorteile der Erfindung bestehen darin, daß ohne zusätzliche Distanzstücke sowohl eine axiale als auch radiale Fixierung aller Teile des Stabkorbes erfolgt und durch die geschweißten Spannringe eine hohe Stabilität des Stabkorbes erzielt wird.The advantages of the invention are that takes place without additional spacers both an axial and radial fixation of all parts of the bar basket and a high stability of the bar basket is achieved by the welded clamping rings.

Claims

1. Bar cage for air classifier, the lateral surface is flowed through against the centrifugal force from outside to inside of sighting gas and consists of parallel to the axis of rotation bars, which are used with their ends in recesses in a hub on the one hand and in a flange on the other hand, both radially and axially are fixed and the distance between the hub and ring by spacers, z. As bolts, is determined, characterized in that the rods (3) at their ends by in the hub (1) and in the flange (2) axially machined rings (5; 7) are fixed axially and radially and each having a clamping ring (10; 11) are surrounded on the circumference in the region of the hub (1) and the flange (2).

2. Bar cage according to claim 1, characterized in that the clamping rings (10; 11) preferably have a conical cross section and consist of at least two segments which are inserted into corresponding conical annular groove (8; 9) and connected to each other by means of welding.

For this 2 pages drawings

Field of application of the invention

The invention relates to the rod basket as a centrifugal system of an air classification with a plurality on its lateral surface and preferably arranged parallel to the axis of rotation bars, which rotates at high peripheral speed and its outer surface is flowed through from the outside to the inside of finely-laden visual gas.

Characteristic of the known state of the art

Such rod baskets are mainly used in air classifiers, which are used for the selective production of high-purity end grain products free of spiked grains. The separation limit is essentially dependent on the peripheral speed of the bar basket. This must be higher, the smaller the desired separation limit. The thereby simultaneously increasing wear on the rod basket, especially on the rods, makes the operation of the plant uneconomical once and on the other hand, the output product is undesirable contaminated by the output. This wear is counteracted by the use of highly wear-resistant materials. This has the consequence that the individual components of the rod basket can not, as usual, be connected by welding or soldering. Due to the heat generated during welding or soldering, their material properties change, thus losing their wear resistance for this area. DE-PS 3508889 includes a corresponding solution for this purpose. Thereafter, the rod basket consists of a hub and a flange whose axial distance is determined by spacer bolts and screws. In hub and flange annular recesses are incorporated, in which the rods sit with their ends with axial play. In the recesses fitted rings of wear-resistant, rubber-elastic material with incorporated from its outer periphery slots fix the rods in position to each other and support them radially against the hub and the flange. This known solution has the disadvantage that the stability of the bar basket is low and is ensured only by the spacer bolts. The latter must be designed to achieve a sufficient stability in their dimensions relatively large, whereby they negatively affect the flow of the visual gases entering the Stabkorbinnere and thus the selectivity.

Object of the invention

The aim of the invention is to develop a rod made of highly wear-resistant material with high stability, without affecting the selectivity of the staff basket negative.

Explanation of the essence of the invention

The object of the invention is to make the inclusion of the rod ends in the rod basket axially delimiting hub and flange so that the rods are fixed radially and axially without spacer bolts and the stability of the staff basket is guaranteed or increased.

According to the invention the object is achieved by the hub and the flange, which limit the rod basket axially, are provided with a plurality of radially extending slots. In these slots, the rods engage with their ends and are radially and axially locked by machined into the hub and the flange rings, which engage axially in recesses in the rods. In recesses on the circumference of the hub, the flange and the rods a clamping ring is placed around the ends of the rod basket. These clamping rings are designed with preferably conical cross section and in at least two segments. These are inserted into corresponding conical grooves and connected to each other under pretension by means of welding. In obtaining the weld, this shrinks, whereby the clamping ring segments are pressed firmly into the conical groove. This creates a tight fit between the clamping ring, the rods and the hub or the flange, whereby the connection of these parts is solidified with each other and increases the stability of the staff basket.