MXPA01002732A - Vertical rotor mill - Google Patents

Abstract

The invention relates to a vertical rotor mill, especially to an impact pulverizer or to a hammer mill for grinding granular material using impact tools (8). Said tools are fixed to a rotating, vertically arranged rotor (7) which is enclosed by a screen (9). The grinding chamber (19) is in turn enclosed by a conic housing (6). The aim of the invention is to simplify access to the screen (9) and to the impact tools (8), and to improve the operating characteristics. To this end, the cone (6) can be lowered together with the screen (9).

Description

VERTICAL ROTOR MILL FIELD OF THE INVENTION The invention relates to a vertical rotor mill, in particular to a hammer mill or to an impact crusher mill, for granular grinding or milling materials by means of impact or hammer tools, which are they mount in a rotating rotor, which is placed, vertically.

Various embodiments of hammer mills or impact crushing mills are known which have the rotating axes of the rotors each positioned vertically or horizontally. For example, the German Utility Model DE-U 8,810,234, describes a hammer mill having a vertical motor shaft with the drive below it. German Unexamined Patent DE-OS 3,636,869 discloses an impact or hammer mill having an impact arm rotor, which is placed so that it can rotate about its axis. Ref: 127172 vertical. The material to be ground or ground is supplied by means of a feeding mechanism that is placed on the upper side of the mill. European Patent Application EP-A 556,645, 5 describes an impact grinder mill having a housing, in which a vertical rotor equipped with impact or hammer tools is placed, wherein at least one intake opening for the material which is going to be ground, is provided on top of impact tools or hammers on the upper side of the housing. Impact or hammer tools are placed in groups, in the direction of the axis of rotation, with tools from a group that is located on the same axis, perpendicular to the axis of rotation. At least the ends of impact tools or hammers of the upper group at the radial outer ends, are located at a smaller distance to the outside than those ends of at least one of the lower group. 20 The impact crusher mill is operated in ambient air. The housing of the impact crusher mill is made of a lower conical collecting part and a mill housing part cylindrical superior. The mill housing part, in turn, surrounds a grinding or milling space, a screen and a discharge area for fine particles. Joints that absorb vibration are provided between the two housing parts. To improve the vibration-absorbing effect, Swiss Patent CH-A 686,875 proposes that the upper side of the mill housing part is designed in the form of an upper part, so that at least three devices absorb vibration, which they contain spring elements that are placed in a uniform distribution around the outer periphery of the mill housing, and further, so that a flange on the mill housing part is connected, in a flexible manner, to the upper part. The height of the connection between the mill housing part and the upper part is adjustable (air space). The resulting air space is sealed by means of a joint. 20 Impact crushing mills with cup-shaped sieves or sieves are also known, for example, according to US Pat. Nos. 3,169,711 and 4,243,180, where the face of ^^ and ^? ^^. ^^^^^, ^, ^^ ,,. The end of the screen is oriented vertically or horizontally. In both cases, this is complicated to assemble and remove the screens, because a multitude of parts must be removed. With large 5 hammer mills, the screen is heavy and has a large external jacket wall height, so it is difficult for it to be above the rotor without tilting. European Patent EP-B 525,362 proposes a device by means of which mounting and disarming the screen must take place quickly and safely. To do this, at least two fasteners, which are distributed around the periphery of the screen, they can be moved between two stops by means of a linear guide of the screen. A stop is selected so that the screen is cup-shaped, can be removed from the screen if it is moved around the mill, and the other stop is reached when the rotor is surrounded by the external screen jacket and the outer edge of the screen. external screen shirt, which protrudes into a corresponding sealing surface. To access the screen or to change the screen, you have to reach it through a door in the mill housing, which is not only tedious and consumer of ^^^^^^^^ and ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^ time but can also interfere with sanitation and safety from the risks.

Therefore, the objective of this invention is to simplify the access to the screen and to the impact or hammer tools of a vertical rotor mill and improve the operating properties and expand the range of use of such mills. This objective is achieved through the features that characterize claim 1. Advantageous embodiments are derived from the dependent claims. The lower part of the vertical rotor mill housing is designed in the shape of a cone that surrounds the screen and can be lowered. In the drop condition, the screen can be moved by analogy with European Patent EP-B 525,362. The metal screen basket itself is designed in one or more parts, and the screen plate is preferably designed with all the same screen holes. The screens themselves are drilled with a distance and direction ^^^^^^^^^^^^^^ É ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ j ^^^^^^^^^^^^^^^^^^^^^^ special (superimposed in the longitudinal direction), which improves grinding or milling. To improve the vibration-absorbing effect and the sound absorbing effect, the engine flange is placed in or on absorbent elements or in an absorbent sleeve. The assembly and disassembly of the screens and also an eventual cleaning, are simplified, significantly, by measurements which, apparently, are simple when taken, separately. At the same time, operation safety is increased by means of a new safety concept, namely, access to the rotor and hammer or impact tools is impossible in the operating state.

This invention is described in more detail below on the basis of a modality illustrated in the drawings, which show: Figure 1 is a side view of the vertical rotor mill; Figure 2 is a partial sectional view of the cone; Figure 3 is a partial sectional view according to Figure 2 in another variant; Figure 4 is a detailed view of the external screen jacket.

A vertical rotor mill 1 consists, essentially, of a supporting frame 2, which is connected to a base plate 3 which has an engine 4 on its upper side, the motor serves as an impeller for a rotor 7, which in turn rotates, essentially, around a vertical axis of rotation, as well as a cone 6 in which the rotor is placed 7. Engine 4 seats in a sleeve absorbent 24 on the absorbent elements 26. In addition, a material feeding mechanism 5 is placed on the base plate 3. Impact or hammer tools 8 are placed on the rotor 7 on the outside and mounted, radially, so that they can rotate around the axes of rotation parallel, essentially, to the axes of rotation. Impact or hammer tools 8 are placed in groups, from preferably, in the direction of the axes of rotation, with the radial external ends of the impact tools or hammers 8 of the individual groups that are placed at different radial distances, intermittently, and with the impact tools or hammers 8 that are also placed, eccentrically, in a group. Impact or hammer tools 8 of a group are provided in this manner, with different radii, based on the radial outer ends. A sensor 29 is provided on the drive train to detect an imbalance. In comparison with the state of the art, a larger number of impact tools or hammers 8 are used here in normal case (4 to 12 stations are possible). In the operating state, the rotor 7 and impact or hammer tools 8 are surrounded on the side and bottom by a screen 9. This is preferably a screen or sieve in the shape of a cylindrical cup. consisting of an outer perforated screen sleeve 10, in one or more parts and a screen plate perforated 11. The perforations in the screen plate 11 itself are the same, preferably for different applications, which greatly simplifies the storage of replacement parts, as well as simplifies grinding or milling itself. . A special perforation allows an open sieve area of at least 50%, approximately. The outer filter sleeve 10, like the metal screen basket, consists in a preferable, of only one part. A multi-part design is also possible, in particular to reduce the loading volume. It is possible to provide screen recognition, by means of which the external screen sleeve 10 has screws 31 that are placed in a specific separation (depends on the size of the holes). A presence and / or distance measurement is carried out by means of another sensor, namely a potentiometer 32 here, so that the screen can be identified and distribute, also with respect to the milling warehouse. To clean or replace the screen 9, it is mounted so that it can be rotated together with the cone 6, until the rotor 7 and screen 9 are fully exposed. The straight-line guides 13 provided in the hollow columns 12 of the frame 2, 5 are connected with at least one lifting device, preferably an air cylinder 14. The connection between the cone 6 and the straight-line guides 13 is provided via the connection point 16 and the connection between the cone 6 and the screen 9 is is established through the connection point 15. The vertical path of the cone 6 is limited at the upper end by the external screen jacket 10 and is limited at the lower end by the cylinder 14. The vertical path of the screen 9 is limited at The lower end has a vertical guide with a stop 30. On the one hand, there is therefore free access to the screen 9 and impact or hammer tools 8, as well as to the inside of the cone 6, while On the other hand, access to the screen 9 and the rotor 7 is impossible during operation. The interior of the cone 6 is divided by the screen 9 into two sub-spaces, a grinding space 19 in where the rotor 7 is placed and a collecting space 20 where the ground or milled material is collected. The ground material can be discharged through at least one emission opening 21, which is provided at the lower end of the collecting space 20. The cone 6 and the base plate 3 as well as the grinding or milling space 19 They are designed to withstand shocks or pressure variations in this mode. The material to be milled or ground is supplied through a feeder mechanism, the material feeding mechanism 5. The material continues through the connection 22 and into at least one intake opening 23 into the space of milling 19. Conventional heavy material separation devices or magnetic separators, such as those described in European Patent EP-B 556,645 or Swiss Patent CH-A 686,875 can be connected upstream from the material feeding mechanism 5. A material can be supplied to the intake openings 23 of the mill in a manner measure and continue by means of this feeding mechanism. A pressure compensating orifice 25 is provided to prevent excess pressure or reduced pressure in the milling chamber (collecting space 19). The pressure conditions are regulated by means of the pressure sensor 33. The operation condition of the mill 1 with respect to vibration, support damage, breakage of hammers or foreign parts, for example, can be monitored by means of the sensors 29, 33. The connections 22 have a round cross section and can easily be replaced in case of wear. The feeder mechanism can supply material through only one or two vertical rotor mills 1 in parallel, as has been described in European Patent EP-B 556,645. For vibration and noise absorption, the flange 27 of the motor 4 is mounted, in a flexible manner, on the absorbent elements 26 or in an absorbent sleeve in the form of a flange 24.

- ~ * B + X? * ÍykÍ «! kx¿ £ íí * f &rr.,. The frame 2 is preferably placed on an intermediate lower part 28 of a mill construction by means of a lower plate 17. The lower plate 17 has an opening, which is assembled, of concentrically, with the emitting aperture 21. The aperture of the lower plate 17 has a telescoping gasket 18 capable of being inflated, which surrounds the emitting aperture 21 and seals the aperture in the inflated state. The telescopic joint 18 is ventilated before the vertical movement of the cone 6.

Reference Notation 1 vertical rotor mill 2 frame 3 base plate 4 motor 5 material feed mechanism 6 cone 7 rotor 8 impact or hammer tools 9 screen 10 external screen sleeve 11 screen plate 12 column 13 straight line guide 14 cylinder pneumatic 15 connection part 16 connection part 17 lower plate 18 telescopic joint 19 collector space 20 collector space 21 emission aperture 2 connection 23 inlet opening 24 absorbent sleeve 25 pressure compensation opening 26 absorbent element 5 27 flange 28 intermediate bottom 29 sensor 30 stop 31 screw or bolt 10 32 potentiometer 33 pressure sensor It is noted that in relation to this date, the best method known to the applicant to carry to practice the aforementioned invention, is the conventional for the manufacture of the objects or products to which it refers. twenty ? & < ^ * 3? ¡. * T ¿A¿A * ^ ... ¿^^^^^^^^

Claims (11)

Claims The invention having been described as a background claim is claimed as contained in the following claims: 1. A vertical rotor mill for grinding or milling material with a housing in the shape of a cone surrounding a grinding space, with a vertical rotor, which is placed, vertically, and which is provided with a motor and 10 impact tools or hammers, which are placed in groups in the cone, where at least one intake opening, for the material to be ground, is provided on top of impact tools or hammers on the side superior of 15 housing, a cup-shaped screen that surrounds impact or hammer tools and is positioned in a manner capable of being displaced, vertically, and with an emission opening that is provided in the lower part of the cone, characterized because the
1. The screen is connected to the cone and can be lowered together, vertically, with the mill between the stops.
2. 2. A vertical rotor mill according to claim 1, characterized in that the radial outer ends of the hammer or impact tools of the individual groups are placed at different distances, radially, in alternation, and the impact tools or of hammers are placed, eccentrically, in a group.
3. 3. A vertical rotor mill according to claim 1, characterized in that a flange 10 of the motor is mounted, in a flexible manner, on absorbent elements or in an absorbent sleeve.
4. 4. A vertical rotor mill according to claim 1, characterized in that the external screen jacket of the screen has different perforations, and the open screen area reaches at least 50%, approximately.
5. 5. A vertical rotor mill according to claim 1, characterized in that a screen plate is provided with only one hole size.
6. 6. A vertical rotor mill according to claim 1, characterized in that it can function as a single machine or as a twin machine, wherein the material is transported through * ^? | * ^ ^^ s ^^^^^ A A & ^ ^^^ i ^ ^ ^ Ss ^ and a common mechanism of material feeding, in the case of twin operation. A vertical rotor mill according to claim 1, characterized in that a lower plate is provided as part of, or is provided independent of, a vertical rotor mill frame, which has an opening with a telescopic seal capable of being inflated, which surrounds the emission opening and seals it in the inflated state. 8. A vertical rotor mill according to claim 1, characterized in that a sensor is placed on the drive train. 9. A vertical rotor mill according to at least one of the preceding claims, characterized in that the external screen jacket has at least one element for identification, in particular a screw, which is placed in a fixed manner, at a distance Specifies the base plate, as a function of the hole size of the screen. 10. A vertical rotor mill according to at least one of the preceding claims, characterized in that the screens are provided with Sat g ^ and perforations that overlap in the longitudinal direction. 11. The use of sensors in the vertical rotor mill, according to claim 1, characterized in that they can monitor the operating condition of the vertical rotor mill, in particular with regard to checking the vibration, to recognize foreign parts, to be checked the damage of support and breakage of hammers. 10 fifteen twenty