DD214302A1 - DISCHARGE DEVICE FOR ROLLING MILLS - Google Patents

Abstract

The invention relates to a discharge device for Waelzmuehlen horizontal grinding plate and rolling thereon rolling rolls, in which the entire material is discharged through the Mahltellerrand down. To increase the reliability and availability of such Waelzmuehlen is to protect the Muehlehgehuse in the field of Mahltellers from wear by appropriate design of the discharge. The object is achieved by arranging between the discharge ring connected to the grinding plate and the material housing provided with several, each paired with a material discharge in pairs, upwardly open, arcuate Austragsschurren are uniformly distributed around the circumference.

Description

Austragsvorrichtung for Wälzmühlen field of application of the invention

The invention relates to a discharge device for rolling mills, which transports the millbase falling over the grinding path edge of the grinding track rotating about the vertical mill axis out of the mill housing ·

Characteristic of the known technical solutions

In a known roller mill according to DE-AS 12 38 753 »in which the entire ground material is discharged over the Mahlbahnrand down, a discharge is arranged below the grinding path · This is rotatably connected to the grinding table, which carries the grinding path · The of The material falling down the grinding track reaches the discharge ring and is conveyed by it to the lateral material discharge arranged in the mill housing, where it is thrown off the discharge ring by the centrifugal force · During transport of the material to be ground on the discharge ring for material discharge in the mill housing, the mill housing itself prevents premature dropping of the product grinding material from the discharge ring · this rubs which is constantly pressed by the centrifugal force, the material situated on the Auetragsring ", on its way up to the material constantly to the mill casing, thereby in this area is subject to high wear ·

7AM 13 83 * 0980

For highly abrasive materials, such as cement clinker, this wear increases in a unökonomiachea area. The wear on the drum casing entails a high maintenance and repair effort and associated above-average downtime of the mill "because these repairs can be performed hur at mill stoppages ·

Object of the invention

The aim of the invention is to increase the operational safety and availability of the rolling mill by reducing the repair and maintenance costs.

Explanation of the essence of the invention

The object of the invention is to protect the mill housing in the region of the grinding path from wear or to reduce wear by appropriate design of the discharge device.

According to the invention the object is achieved by a plurality of, at least one material discharge paired Austragurrurren to «ordered« are arranged between the lateral or below the grinding path discharge ring and the grinding path surrounding mill housing with material discharge. This is done so that the discharge chutes each from the low-lying material discharge to both Upwards, they are arranged on the inner shell of the mill, with two discharge chutes meeting each other at their highest point. In order to save height, the payload chutes can also be made shorter. In this case, a horizontal one arises between the upper end points between each pair of tumbling chutes Surface · Scrapers for this surface are arranged on the discharge ring in this case.

21. M1383 * 0980 ·

A variant of the discharge ring is that this is formed by an upwardly open, annular container whose outer wall is formed of a plurality of flaps · These are mounted horizontally suspended or upright or vertically stored «The flaps are actuated by arranged on the housing Fuhrungsbahnen which interact with guide pieces on the flaps

Another variant is that the bottom of the container-shaped discharge ring is formed by a plurality of flaps which are pivotally mounted on the inner side wall · Another possibility is to form the bottom and the inner side wall by a plurality of angle flaps, the are pivotally mounted inside or directly on the grinding track.

In order to keep the distance between the grinding path edge and the housing wall as small as possible, it is possible to assign the discharge ring attached to the grinding path edge directly to the material discharge in the side wall.

With increasing Mahlbahngröße the peripheral speed of the Austragsringes assumes sizes that its previously described function in question · For this reason, the discharge ring can also be arranged separately from the grinding path · The drive takes place in this case, either via a reduction gear from the grinding table or by a separate drive with lower peripheral speed ·

But it is also possible to arrange the inner wall of the mill housing arranged Austragsschurren directly below the grinding path, with their bottom inclined to further height minimization only very slightly towards Materialaustrag, but is ventilated ·

Auafuhriui g Bbe i Bui e 1

The invention will be explained in more detail in the exemplary embodiment. In the accompanying schematic drawings:

Pig · 1 A section through a roller mill at the level of the grinding track ·

Pig × 2 A section along the line I-I in Pig × 1.

3 Pie Training of container-shaped discharge ring with side flaps ·

Pig · 4 The variant of Pig. 3 in plan view «

FIG. 5 The container-shaped discharge ring with bottom flaps

Pig · 6 The variant of the Pig · 5 in plan view «

Pig · 7 The discharge ring driven separately from the grinding track with its own drive ·

Pig · 8 The discharge ring with reduction gear to the grinding track ·

Pig · 9 The arrangement of the discharge chutes directly under the grinding plate ·

Pig mill 1 and 2 show the area of the grinding track of a roller mill. Here the mill housing 1, the grinding track 2, the discharge ring 3 arranged at the same height on the grinding track 2 and the discharge chute 4 arranged on the inner housing wall 1 are shown.

91JIIK. 1983 * 0980?

While the discharge ring 3 is fixedly arranged on the circumference of the grinding track 2 and rotates synchronously with it, the discharge chutes 4 are fixedly mounted on the mill housing 1. The discharge chutes 4 surround the discharge ring concentrically and incline in pairs in the direction of the material amount 5 which is arranged in the mill housing 1 Depending on the size of the mill, this may be one, as shown in FIG.

The millbase comminuted by the grinding rollers which are ground on the grinding track 2 passes through the grinding path edge on the side of the grinding track 2 at the same height with this or below the same arranged discharge ring 3 · From these it continues by means of centrifugal force in the discharge chutes concentrically surrounding the discharge ring 3 These are each assigned in pairs to a material discharge 5 in the mill housing 1. In their highest function, they form a vertex 6 with the discharge chutes of the adjacent material support. 6 As shown in FIG. 1, this vertex 6 can be very wide, thereby increasing the overall height of the mill base can be kept within limits · Material lying on the apex 6 is conveyed into the discharge chutes 4 by scrapers 7, which are fastened to the discharge ring 3 and reach radially close to the mill housing. Here, according to gravity, it slips together with the directly from the Austragsr 3 material transported to the outfeed chutes 4 to the mill discharge 5 and out of the mill "

In FIGS. 3 to 6, the discharge ring is shown as an upwardly open annular container 8 in direct connection to the material discharge 5. FIGS. 3 and 4 show that the outer wall of the container-shaped container is shown in FIG

Oi .

These are standing pivotally mounted and open in the area of the material discharge 5 by centrifugal force and thus give the grist lying in the discharge ring the way into the material discharge 5 »After passing through the material Austrags these flaps closed and guided by guide rails 13 on the mill housing 1 again, so that in the discharge ring 8 to the next material discharge falling from the grinding path 2 regrind can collect therein · scraper 10, which are arranged in the direction of rotation after the material discharge on the mill housing 1, prevent caking of material on the discharge ring 8 · driver 11 push material through to the material discharge 5 ·

The design of the bottom of the discharge ring 9 by a multiplicity of bottom flaps 12 is shown in FIGS. 5 and 6. In the area of the material discharge 5, they open downwards by gravity and deliver the ground material collected in the discharge ring into the material discharge 5. After passing through the material discharge 5 the bottom flaps 12 are held closed by guide rails 13 on the mill housing in cooperation with guide pieces 14 on the bottom flap · Ground material falling through slots between the bottom flaps is pushed through carrier 11 to the material discharge 5.

7 and 8 show how the grinding track 2 and the outer bearing ring 3 can be driven at different speeds. Since the peripheral speed is very high for large mills and thus the function of the container-shaped discharge ring 9 is called into question, the drive of the discharge ring 9 is function at a lower speed ·

1983 * 0980

In Pig · 7 this drive takes place with its own drive 15 · After Pig · 8, however, the drive is removed from the grinding track 2 via a reduction gear 16 ·

In FIG. 9, the arrangement of the discharge chutes 4 is shown directly coaxially about the grinding track 2. The material to be ground falls here from the grinding track directly into the discharge chutes 4. If a broad vertex 6 is present (not shown here), the material lying thereon is removed by scrapers Discharge chutes conveyed "These scrapers", which are not shown, are fastened to the grinding track 2 ·

21. »1983 * 0980

Claims (1)

Erfindungsanapruch 1 "discharge device for roller mills arranged below the grinding path between the grinding plate and Mühlengehäuee iet and consists essentially of a connected to the grinding divider Austragaring which is provided on its underside with Schaberleisten and serves as a connection between the grinding path and lateral material discharge, characterized by that between discharge ring and material discharge several, each a material discharge paired, upwardly open, arcuate Austragsschurren are evenly distributed around the circumference « 2 · Discharge device according to item 1, characterized in that the discharge ring is an upwardly open, annular container whose outer wall is formed, for example, from a plurality of guide pieces provided with flaps which are horizontally suspended or upright, or vertically mounted and corresponding? guide tracks are arranged on the housing 3 · Discharge device according to items 1 and 2, characterized in that the bottom of the container is formed from a plurality of flaps which are pivotally mounted on the inner side wall » 4 "discharge device according to item 1 to 3, characterized by» that the bottom and the inner side wall of the container is formed by a plurality of angle flaps, which are rotatably mounted inside or * on the grinding table « 5 · Discharge device according to items 2 to 4 »marked« · net, characterized in that the container-shaped outer ring is directly connected to the material discharge · 6 * Discharge device according to points 1 to 5, characterized »distinguished by the fact that discharge ring and grinding path lie in one plane · Discharge device according to item 1, characterized in that the arcuate discharge chutes arranged in pairs around the grinding table are arranged directly beneath the grinding path. 8 · Discharge device according to points 1 to 7 »characterized in that the bottom of the discharge chutes is ventilated · 9 · Discharge device according to points 1 to 6, characterized in that the speed of the discharge ring is less than that of the grinding plate · For this. A "Drawings 21-JUI11983 * 0980?