DD221925A1 - TURMET GRINDER FOR CONTINUOUS DRY GRINDING OR MIXING FLOW-PROPELLED GRINDING MACHINE - Google Patents

Abstract

The invention relates to a rotary tower mill for continuous dry milling or mixing of flowable millbases in a vertical grinding vessel with the aid of a slowly rotating screw mixer using grinding media, which is preferably suitable for the grinding of soft to medium grinding materials. The Turmreibmühle invention is characterized by a comparatively low expenditure on equipment, location independence, a simple process control and control and a significantly lower energy consumption, with the possibility of adapting the design parameters of the agitator mill in a simple manner to the respective crushing task. The millbases are in this case ground or mixed in one pass, wherein the necessary residence time can be adjusted by the variation of the inner elements or special internals.

Description

Title of the invention

Turmreibmühle for continuous Trockenmahle ή. or mixing flowable regrinds

Field of application of the invention

The invention relates to tower rotary mills for continuous dry milling or mixing of flowable millbases which are soft bia medium hard. The invention can be used in all sectors where soft to medium grinding materials are to be milled or mixed, for example in the coal processing industry, building materials industry and food industry. '/

Characterization of the known technical solutions

1.5 For continuous grinding of solid particles. currently novel Turmreibmühlen (DE-OS 3 02'1 071 * DE-OS 2 920 '046, B 02 C 17/16) applied, consisting of vertical filled with grinding cylindrical grinding vessels a bestiWten slenderness, in which a vertical Schneckenrührer In the case of these mills, the particles of solids laterally fed in through the grinding vessel wall are slowly grated by the rotation of the chopper stirrer. The particles of product fineness produced during the milling process are carried away by a carrier medium in these mills Wet grinding to a suitable liquid, in the case of dry grinding to a suitable carrier gas acted Characteristic of dry and wet grinding is that the Hauptbewegungsdo-h. Discharge direction of carrier medium and auszustagendem

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Suitable separation organs then take over the separation of carrier medium and finished product, before the carrier medium in the closed circuit at the level of the Mahlgefäßbodens again fed to the grinding process is characteristic of dry and wet variant of the "ser Known mills are still the simple, not subdivided grinding vessel without internals with circular cross-section and centrally arranged, cantilevered stirrer shaft and a monodisperse Mahlkörperschüttung · The use of polydisperse Mahlkörpergattierungen is indicated for energetic and wear-technical reasons as impractical, since the polydispersen Gattierungen With the help of a worm stirrer, it is difficult to loosen up tight packing (Mölls, H, H, Hörnle, R. Mechanism of action of wet pulp agitator ball mills, Beit rag III-1 to the 3 · Europ. Symp. Zerkl ·, Cannes 19-71, Preprints S, 565-594) · The dry milling of the particles of pesticides in such tower grinders naturally has a number of disadvantages, both constructive, procedural, and of an economic nature ·

Due to the high expenditure on equipment for the ancillaries and the realization of the carrier gas cycle process control and control complicated immensely, the additional need for electrical energy for the operation of the carrier gas circulation half of the energy required for the actual crushing achieved (brochure material from the company. Japan Tower Mill Go. Ltd. ·).

The effective operation of such Turmreibmühlen is, subject to compliance with a number · T ₀ is difficult to be influenced constraints linked particularly with respect to the grinding and Fertigguttransportes throughout the circulation circuit · The known Turmreibmühlen are still tailored to their specific assemblies to a particular size reduction task with the possibilities of variation are small and real improvements with regard to the milling process can not be achieved by means of a suitable design of the internal elements of the tower-type grinding mill. A grinding or

Mixing of solid particles of different Mahlgutarten and grindability and the discharge of mixtures through the directed on the upper Austragsb'ffnung carrier gas is difficult.

In addition, a number of special stirred ball mills are known (DE-AS 12 11 904, DE-AS 12 30 657, DE-AS 12 50 246, DE-AS 12 07 652, DE-AS 12 07 441, 50 C 17/20 ), but only for wet grinding in question · Furthermore, a solution known (DE-AS 12 82 392), in which a Mahlgutaufgabe can be done from above. DaTiei is a high-speed agitator mill in which the stirrer elements are disk-shaped and the millbase is the grinding chamber via an adjustable annular gap with the aid of vanes located under the mill body, which are equipped with a kind of centrifugal

make pump leaves. .

The effect of the disc-shaped stirrer elements and the use of a centrifugal pump, however, require a liquid as a transport medium. Otherwise, acceptable throughputs can by no means be achieved via the mentioned annular gap.

Object of the invention

The aim of the invention is to develop a tower grinder, which is characterized by a reduced expenditure on equipment, location independence, simple process control and control at the same time reducing the energy demand, the design parameters of the tower grinder in a simple way the respective crushing task are adaptable and at the same time a better grinding or mixing is achieved in the grinding vessel ·

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Explanation of the essence of the invention

The causes for the high expenditure on equipment, the complicated process control and the high energy consumption are that the transport of the solid particles is realized via a circulating carrier medium, which requires a complicated separation of carrier gas product granules makes·

The relatively high expenditure on technical equipment required for the construction and the procedural parameters

Meter of mills to change according to a fundamentally new crushing task, cause is that the known tower mills are adapted only to a specific crushing task "It is therefore an object of the invention," the existing tower mills for dry grinding of pesticide particles by eliminating the carrier medium and thus the apparatus - And energy-intensive, poorly controllable and afflicted with many influencing variables circuit circuit fundamentally simplify that can be milled with the tower mill in a single pass to the desired product fineness.Further object of the invention, the tower mill by a modified transport guide the ground material in the grinding vessel so that a grinding or mixing is possible or the grinding process is intensified. According to the invention this object is achieved in that the upper boundary of the grinding vessel is designed as a cover plate, which is a regrind can contain task, that a minimum and a maximum distance between the center of the> agitator shaft and the outer surface of the grinding vessel exist and that the bottom of the grinding vessel is a special storage device, which is interchangeable, prevents the Mahlkörperaus- contribution and the Mahlgutaustrag realized _β It is also essential to the invention that the storage devices can be designed as a screen, perforated plate or grid, that the holes have different holes, also deviating from the circular cross-section or that the holes can be of different lengths, that the grids are both solid and solid can be movably arranged that Mahlkammersegmente and stirrer lengths exist, which are interchangeable on the modular principle and the mill is thus variable in height and that on the height of the grinding vessel accumulation of certain "cross • sectional form can be attached""The invention allows the task of the ground material through a feed opening, the 'in the upper part of the grinding vessel, doh. in the cover plate or can be arbitrarily on the mill cylinder, so that the material to be ground is transported through the grinding vessel, wherein the crushing is carried out by the grinding media, which are moved by the slowly rotating Sehneckenrührero The crushing stops until the material to be ground the bottom

- Mahlgefäßea reached, wherein the indwelling ze it by the input _s built and the eccentric Sehneckenrührer designed werden'kann that the desired grinding result wirdö achieved after grinding, the ground product leaving the milling vessel by the dispensing device, wherein the grinding media is retained and the after execution different granulometric sizes of the ground product (grain size, grain shape) can be influenced.

The invention is characterized by the following advantages: 10

- No ancillaries, thus low technical complexity and low production costs,

- simple design, therefore simple condition, easy maintenance, maintenance and relative local independence, ** modular principle, thus easy interchangeability of the parts and high variability,

- intensive grinding or mixing possible,

- Low cost (demand) of electrical energy, only slightly above the energy required for actual comminution,

«More effective size reduction, mixing and retention by Innanelemente and * eccentric η stirrer,

- Savings in height

The invention will be explained in more detail with reference to an exemplary embodiment.

Embodiment Γ

Pig. 1 shows a device according to the invention for dry milling or mixing soft to medium-hard particles of pesticide according to the continuous flow principle.

According to Pigo 1 and Pig * 2, the tower grinder according to the invention consists of a grinding vessel 1 which is variable in length as well as its cross-sectional shape, with cover 2 in which a feed opening 3 is located and the storage ring 5 and the baffle plate 6 ₀ . The millbase conveyed continuously into the grinding vessel 1 is in the presence of the worm-and-tube stirrer 4, which is variable in its length and corresponding to the grinding vessel

, of grinding bodies to product fineness comminuted The separation of the grinding bodies takes place at the perforated disc with special, also by Kreiaquerschnxtt deviating hole shape and certain hole length, as a sieve with a certain mesh size and shape or as a rust, fixed or «movable, formed baffle plate 6. The task openings 7 for the multi-component milling or mixing are distributed over the Mahlgefäßsegmente

Claims (2)

Invention claim. 1. Turmreibmühle for continuous dry grinding or mixing flowable millbases using grinding media in vertical grinding vessels, characterized in that the upper boundary of the mill cylinder is designed as a cover plate, a minimum and a maximum distance between the center of the agitator shaft and the outer surface of the grinding vessel exist a Mahlgutaufgabeöffnung is in the cover plate or the upper part of the grinding vessel and the bottom of the grinding vessel is a special storage device · 2β tower grinder according to item 1, characterized in that minimum and maximum occur in one or more points, or a circular cutout (semicircle), wherein the maximum distance between Sehneckenrühreraußenkante and Mantelinnenfläche the grinding vessel must be greater than the Mahlkugeldurchmesser used. Turmreibmühle according to item 1, characterized in that the storage device can be designed as a sieve, perforated plate or grate · Turmreibmühle according to item 1 and 3, characterized in that the holes of the perforated plates of different, from the circle ·· cross-section also deviating form or of different. rather length can be. 5. tower grinder according to item 1 and 3, characterized in that the grates can be made both solid, and movable and are interchangeable. 6ο tower mill according to item 1, characterized in that the Mahlkammersegmente and the stirrer shaft are variable in length and can also be used according to the modular principle Turmreibmühle according to item 1, characterized in that can be arranged over the height of the grinding vessel accumulation rings, which realize a uniform gap - Mahlkugeldurchmesser between the inner edge, storage ring and Sehneckenrühreraußenkante.