EP0676240B1 - Method and device for milling materials of different granular sizes, especially air-swept mill - Google Patents

Abstract

The grinding particles are fed by a fluidised conveyor stream (13) to a screen where the fine particles are discharged and at least a part of the coarser particles is returned to the grinding path. The ground particles spun out over the edge of the grinding path (5) are exposed to a helical current of the conveyor stream so that an enveloping flow is formed by the spun out particles in a helical upward movement whereby the streams of ground particles are moved in same. The spatial arrangement, structure and/or radial and vertical extension of the flow envelope is set with a controllable fluid conveyor stream which can be regulated by adjusting reinforcement bead segments (10) on the housing wall. The helical current can be produced by a fluid conveyor stream at a speed less than 30 m/s by a twist-producing gas guide unit (14). <IMAGE>

Description

The invention relates to a method for comminuting Material of different grit according to the generic term of claim 1 and a device, in particular for Implementation of the method according to the preamble of the claim 6.

In a shredding device known from DE-AS 1 152 297 with airflow mill is an annular space with a blade ring from a housing wall with a bead armor as wear protection and a grinding track with a retaining ring limited. The outlet cross section of the flow channels and the radial width of the annular space are constant and by the fixed annular bead armor and the stationary storage ring specified. A fluidic Influencing the flow is said to be interchangeable Buckets with a defined surface curvature be made possible.

Another airflow mill is a spring roller mill known and has an annular space, a baffle ring on the grinding ring and a bead-like one Baffle on. To grind and fluid on the gaps To concentrate between the grinding rollers are deflection blades near the center of the grinding bowl and on the housing wall attached. A cover ring and the baffle on the Housing wall cover an annular space up to Opening areas which radially adjoin the grinding rollers, from. The regrind fluid flow is in the interior of the Grinding room and steered under the grinding rollers. Due to the high flow velocity and the redirections happen to swirling the overall flow, which is just like Inhomogeneities of the grinding bed adversely affect the energy balance and the effectiveness of this process and set up impact.

An airflow mill is described in DE 31 34 601 C2, in which the fluid flow with the help of insert elements is directed to the places where the ground good arises. The insert elements have different lengths horizontal legs and are between two Paddles of the blade ring arranged.

An airflow mill is known from DE-OS 23 09 900, whose bead armor consists of segments that can be put together. Each segment can be released with two screw elements attached and has two upper and lower, each different inclined trapezoidal surfaces as wear surfaces on. By a 180 degree repositioning around the longitudinal axis or the Vertical axis can have a non-worn surface and edge be exposed to the flow. An implementation around the Longitudinal axis simultaneously causes a change, for example sharper redirection of the flow and in the granular particles flung into an annular space. The implementation is time consuming and with downtime connected, which lead to an increase in operating costs. If only for locally sharper deflection of the flow individual bead armor segments implemented and thus adjusted swirling of the fluid particle flows Pressure fluctuations in the grinding visible space and inhomogeneities lead in the area of the grinding bed, which affect the grinding performance.

The known methods and devices see an influence the grinding process with the help of a fluid flow in front of one at an appropriate speed predetermined direction, especially in the direction of grinding rollers or between the grinding rollers. For redirection static means are used that are only after an interruption of the grinding process and through an expansion or conversion can be changed.

The complex processes in the airflow mill, the dependencies the different parameters of each other, the influence on the grinding bed and the grain distribution become insufficient takes into account why grinding performance, energy consumption, Fine grain fraction etc. do not reach optimal values can.

From Patent Abstracts of Japan, Vol. 014, No. 007 (C-673), JP-A-01-254267, a generic method is known. A roller mill has facilities for changing the Gap width in the area of the guide vanes and the inclination of the guide vanes. In addition, the fluid flow of the Guide vane ring by a pivotable arrangement of a bulge-like device of the housing wall in the Mills are directed inside.

A generic device, especially for implementation a shredding process of material different Grain is described in EP 0 165 429 A1. The known airflow mill has four over the circumference distributed air supply and adjustable nozzle ring segments on. The nozzle ring segments consist of a inner, stationary wall part, each with two end faces arranged guide parts connected to the mill housing is. An outer wall part of the nozzle ring segments is adjustable in the axial direction. After over the nozzle ring Coarse material particles falling below are transferred to a bucket elevator conveyed upwards and fed back to the grinding process. To keep the quantity and grain distribution of the material in circulation constant hold and the mill becomes full or empty avoid four control loops are provided.

The invention has for its object to provide an efficient shredding process and a powerful device for shredding material of different grain size, which enable particularly effective flow dynamics in terms of optimal bed formation, high throughput and low energy consumption.

The task is procedurally characterized by the features of the claim 1 and device-wise by the features of the claim 6 solved.

Practical and advantageous embodiments are in the Subclaims and included in the description of the figures.

A basic idea of the invention can be seen in with the help of a device, in particular for bead armor segments, which on the housing wall of an airflow mill are arranged adjustable, a regulation of the fluid flow and a dynamic, almost instantaneous Setting a new balance in the fluid flow with help in the grinding view room of an airflow mill a specifically designed flow envelope for targeted, predefinable training of a point of impact of the Flow envelopes on the housing wall and at least to take advantage of partial withdrawal of an external semolina stream.

The flow envelope surrounds the total flow and is preferred as a hyperboloid torus with a defined one Flow envelope formed. As a flow envelope in this context is the outer one, near the housing wall current boundary of the flow envelope, especially a hyperboloid torus, in a vertical axial section considered to understand.

To form the flow envelope, the over the Edge of a grinding path thrown off regrind particles helical flow, preferably with ejector action on the Exit surface of the flow channels exposed. In a helical upward movement is due to the visual effect a flow envelope essentially outer semolina or marginal zone semolina formed.

A major advantage of the invention is that the flow envelope or the flow envelopes of the Hyperboloid torus with the help of adjustable and / or horizontally displaceable bead armor segments during grinding operations can be set.

The regulation of the fluid flow, in particular by changing the projection surface while at the same time Influencing the flow tendency towards the mill center in the area of an annular space between the grinding table and housing wall is carried out according to the invention for a defined formation of the flow envelope used. The free flow cross-section is used as the projection surface taking into account above the blade ring understood the position of the bulge segments.

It is advantageous that the projection surface of the annular Partially, especially in dependence the number and type of rollers can be changed. Prefers the beaded armor segments become horizontally displaceable arranged so that depending on the parameters and the desired shredding result Bead armor segment or several bead armor segments adjusted and thereby the flow envelope of the fluid flow can be changed. In addition to a horizontal adjustment the or the armor segments can be armor segments pivotable about a horizontal longitudinal axis or be arranged adjustable in inclination. The bead armor segments can additionally or alternatively with themselves about their Provide circumferential expansion of continuously changing angles of inclination be.

In connection with a defined fluid flow on the vane ring, which is essentially dependent on the speed of the fluid and an angle of attack of the blades relative to a horizontal can be continuous, from the outside and without delay via adjustable Bead armor segments according to requirements Fluid delivery flow within a flow envelope can be set so that the flow gradient can be influenced in a targeted manner within the airflow mill is.

Depending on the angle of attack of the tangentially arranged Shoveling the blade ring causes an adjustment of the beadplate segments a reduction in the projection area of the annular space and thus the outlet opening the flow rate. At the same time Change of direction in the sense of a changed redirection of the Fluid flow rate reached.

Thus there is the possibility of flow conditions during a grinding process with no significant side effects, Turbulence, etc. in an almost "indirect" way via the Change the hyperboloid torus or the flow envelope.

In a particularly efficient manner, a limited local influence of the flow envelope achieved by just two adjoining bead armor segments can be adjusted at a connection area. Especially with regard to a trouble-free and efficient Shredding and classifying process it is appropriate regulate the fluid flow so that in front of a grinding roller no well-ventilated grinding bed is formed. It is a particular advantage that optimal bed formation achievable in this way by adjusting the bead armor segments is that the grinding rollers as disturbances in the system less influence or no disruptive influence exercise the flow dynamics.

With the help of an adjustment device, at least one Connection area of the bead armor segments in the direction of Longitudinal axis of the airflow mill shifted and / or this be adjusted so that from a partially narrower annular space a lesser but directional influenced fluid flow emerges. The hyperboloid torus is then with an arcuate indentation on the circumference in Art fitted with a waist. Are preferred at one Two-roller mill two, opposing adjustment devices for adjustment of the adjacent bead segments utilized.

It is essential that there is a regulation of the flow rate principally via the hyperboloid torus to the total flow affects what a largely homogeneous grinding bed and an influenceable flow gradient in the grinding visible space result.

Because with a homogeneous grinding bed the efficiency of a Airflow roller mill can be improved is convenient provided one adjustment device each in front of each grinding roller, viewed in the unwinding direction, to arrange.

A device for shredding material, which in particular for carrying out the method according to the invention is suitable, for example an airflow mill, which an annular space with a shovel ring for one Fluid flow between a rotating grinding bowl and a housing wall with adjustable bead armor segments has, the bead armor segments slidably arranged at least in the radial direction are according to the invention with at least one adjustment device, preferably corresponding to the number of grinding rollers Adjusting devices, equipped by outside and especially during a shredding process can be operated. These adjustment devices attack each of connection areas, which of at least two bulge segments are formed. The connection areas consist of fasteners that can be detachably connected. In a expedient and particularly inexpensive training the bead armor segments designed as circular ring sectors connected to one another at their longitudinal end faces.

For a horizontal or radial shift in the direction to the mill axis it makes sense to use joints as connections to use which is a one-sided or reciprocal rectilinear Enable movement. For example, a Axle or fork joint are used where the mounting flanges connected with a cylindrical bolt will.

In principle, the bead armor segments can also be pivoted or tilt adjustable in a horizontal Be stored longitudinal axis.

In one development, several, in particular two Bead armor segments, with each other using levers or adapters connected and operated together. Besides, one is Use of ball joints or wedge-like elements for tilt adjustment possible.

The arrangement and number of adjustment devices depends basically on the number and arrangement of the used Grinding rollers and, if necessary, the pre-compacting rollers. Prefers depending on the grinding roller, one is fixed and two movable bead armor segments arranged, at least however two movable segments. The entirety of the segments, which are assigned to the grinding rollers forms an annular one Bead armor.

In an advantageous constructive training is a Adjustment element designed like a bolt. The adjustment element has a bolt shaft that in the area of Housing wall sleeve-like or via a sliding block guide is led. Process engineering and economic advantages are given because the adjustment element is continuous and can be operated from the outside. Attachment to the Connection areas are made via recesses with bolts.

A shredding device with two grinding rollers looks in an advantageous way of training two to each Adjustments arranged at 180 degrees in front. The segments are with bevels in the area of provided connecting elements arranged on the end face in order a radial displacement or swiveling inwards enable. In order to achieve an optimal fluid flow diversion, can have recesses at overlapping end regions be provided.

The bead armor segments, which represent annulus sectors and possibly one along the circular arc have constantly changing inclination angles are to be realized an adjustment path or an adjustment distance arranged such that a horizontal displacement and / or an inclination adjustment or angular displacement two adjacent beadplate segments with almost sealed Bead armor ring is guaranteed.

An unimpeded adjustment of the bead armor segments will through a sawtooth-like arrangement of the bead armor segments reached.

Bead armor segments are suitable for horizontal displacement with a lower sliding surface that is essentially is formed horizontally and on one on the housing wall and approximately at the level of the exit surface of the blade ring arranged support surface rests.

If necessary, additional flow regulation through a height-adjustable bead armor segment, there can be an intermediate ring segment between the contact surface and the sliding surface be arranged.

An upper one runs parallel to the lower sliding surface Cover surface on which a cover element is arranged. This cover element prevents the accumulation of regrind particles in a dead area.

A connection surface between the lower sliding surface and the top cover surface is exposed to wear Guide surface, which for this reason is almost double is as strong as the sliding and top surface. Around the flow rate with regrind particles, in particular via the Edge thrown off coarse particles towards the grinding path steer, the guide surface is as an inclined surface and radial directed inwards towards the grinding chamber axis. The sloping surface can alternatively with a constant angle to form a circular area or with a continuous changing inclination angle are formed.

In a particularly simple and effective adjustment device grips an adjustment element, which one from the mill housing and a bolt shaft Has guide head for receiving a connecting bolt, in a connection area. An adjustment causes consequently a change of position of the two adjacent ones Bead armor segments.

Depending on the number of grinding rollers, it may be expedient to have fixed ones Bead armor segments alternating with radially displaceable To connect beaded armor segments. Such an arrangement can also be used for inclinable bead segments be appropriate. Adjustable or swiveling segments are similar to the horizontally movable segments educated. It makes sense to shorten the footprint and as a horizontal pivot axis for one to the mill axis directed inclination adjustment.

With the inventive method and the inventive Device can advantageously a crushing process, with the at least partially border zone size are carried out, regulated and optimized, because a fictitious point of impact of the Hyperboloid torus defined on the housing wall can be. In this way the flow resistance particularly low and maximum throughput can be achieved.

Fig. 1

einen Vertikalschnitt durch eine erfindungsgemäße Einrichtung als Ausschnitt im Bereich einer Mahlschüssel mit einem Schaufelkranz;

Fig. 2

einen Horizontalschnitt durch eine erfindungsgemäße Einrichtung mit mehreren Wulstpanzersegmenten sowie schematisch dargestellten Mahl- und Vorverdichtwalzen;

Fig. 3,4,5

eine vergrößerte Darstellung eines ringförmigen Raumes mit einem Wulstpanzersegment nach Fig. 1 und zwei horizontal verstellbaren Anordnungen;

Fig. 6

einen Vertikalschnitt durch einen Verbindungsbereich zwischen zwei Wulstpanzersegmenten;

Fig. 7

eine Draufsicht auf den Verbindungsbereich gemäß Fig. 6;

Fig. 8

eine Draufsicht auf einen Verbindungsbereich zwischen zwei Wulstpanzersegmenten, die in Richtung Mahlraumachse (Innenverstellung) verschoben sind;

Fig. 9

ein Wulstpanzersegment mit stirnseitig angeordneten Verbindungselementen in einem Vertikalschnitt und in Draufsicht;

Fig. 10

ein angrenzendes Wulstpanzersegment mit komplementär ausgebildetem Verbindungsbereich mit vorgesehener Aufnahme eines Verstellelementes;.

Fig. 11

Strömungs-Einhüllende in Abhängigkeit vom Anstellwinkel α und Wulstneigungswinkel β in einem schematischen Vertikalschnitt durch einen Mahl- und Sichtraum einer Luftstrommühle;

Fig. 12

eine Draufsicht auf einen Verbindungsbereich zweier Wulstpanzersegmente mit angreifender Verstelleinrichtung;

Fig. 13

einen Vertikalschnitt nach Linie A-A gemäß Fig. 12 und

Fig. 14

eine Draufsicht auf ein Verstellelement.

The invention is further explained below with the aid of a description of the figures; in the accompanying drawing show in a highly schematic manner:

Fig. 1

a vertical section through a device according to the invention as a cutout in the area of a grinding bowl with a blade ring;

Fig. 2

a horizontal section through a device according to the invention with several bead armor segments and schematically shown grinding and pre-compacting rollers;

Fig. 3,4,5

an enlarged view of an annular space with a bead segment according to Figure 1 and two horizontally adjustable arrangements.

Fig. 6

a vertical section through a connection area between two bead armor segments;

Fig. 7

a plan view of the connection area according to FIG. 6;

Fig. 8

a plan view of a connection area between two bead armor segments which are displaced in the direction of the grinding chamber axis (internal adjustment);

Fig. 9

a bead armor segment with connecting elements arranged on the end face in a vertical section and in plan view;

Fig. 10

an adjoining bead armor segment with a complementarily designed connection area with the provided accommodation of an adjusting element;

Fig. 11

Flow envelope as a function of the setting angle α and bead inclination angle β in a schematic vertical section through a grinding and classifying chamber of an airflow mill;

Fig. 12

a plan view of a connection area of two bead armor segments with engaging adjusting device;

Fig. 13

a vertical section along line AA of FIG. 12 and

Fig. 14

a plan view of an adjusting element.

Fig. 1 shows a section of an airflow mill 4 in Area of a grinding bowl 6 as a device for comminution of material. Grinding rollers 7 roll on a grinding track 5 frictionally or are driven separately. That too shredding material of different grain sizes is almost placed in the middle of the grinding bowl 6. Between the Grinding bowl 6 and a housing wall 3 is an annular Space 8 formed in which a blade ring 12 is arranged is. The blades of the blade ring 12 are tangential and at an angle of attack α (angle to the horizontal) arranged and form an annular gas guide 14, the flow channels 15 of a flow 13 of a Give fluids an ejector effect.

A bead armor is made above the blade ring 12 Bead shell segments 10 arranged (see also Fig. 3 to 5, Fig. 13). The bead armor segments 10 have a lower, horizontal sliding surface 28, an upper one, parallel to the sliding surface extending top surface 22 and one for annular Room 8 directed, inclined guide surface 34, the Inclination and / or swivel position in connection with the angle of attack α of the blades of the blade ring 12 a Defined fluid flow deflection and regulation enables.

3, 4 and 5 is the positioning of a bead segment 10 shown in the area of the blade ring 12. It can be seen that a horizontal shift the beaded armor segment 10 to a change in Area of the gas guide device 14 with respect to direction, volume and velocity of the fluid particle flow.

2 shows a top view of a grinding bowl 6 with two grinding rollers 7 and two smaller pre-compacting rollers 11 of the blade ring 12 and eight of the twelve required Bead shell segments 10 shown. For the same Identical reference signs are used for features. The Bead armor segments 10 are on their longitudinal end faces 25 connected to each other via connection areas 21. The direction of rotation of the grinding bowl is by one Arrow 16, the rolling direction of the grinding rollers 7 through the Arrows 17 indicated. An adjustment device 20 is for better overview e.g. between a grinding roller 7 and one Precompaction roller 11 arranged.

Adjustment of the bulge segments at 20 becomes corresponding the inventive method in one area made in the direction of rotation of the grinding bowl 6 (arrow 16) lies behind a grinding roller 7. The adjustment is on the other hand at the connection area 20 'with a not shown Adjustment device 20 as a horizontal displacement the bulge segments have been performed. The Projection area of the annular space 8, including the free flow cross section above the blade ring 12 taking into account the position of the bulge segments 10 is understood, is in this area, behind one Grinding roller 7 is much narrower than in the rest of the area.

In the illustrated grinding bowl 6 with two grinding rollers 7 in principle, two adjusting devices 20 are sufficient, which, viewed in the direction of rotation of the grinding bowl 6 (arrow 16), are to be arranged behind the grinding rollers 7. The one at an adjustment Bead shell segments 10 involved can be in the described in connection with FIGS. 6 to 10, 13 and 14 Way to be attached.

3 to 5 is a possible horizontal shift the bulge segments 10 can be seen. The Sliding surface 28 is over at least one intermediate ring segment 27 attached to the housing wall 3. Above the bead segments 10 are cover elements 33 lying at an angle provided, the regrind near the housing wall 3 after lead radially inside to the fluid flow.

6 to 10 is an appropriate design of a Connection area 21 with connecting elements 23, which formed on end faces 25 of the bead armor segments 10 are shown. In the connection area 21 is in circular holes and a connecting bolt in an elongated hole introduced, which, if at this connection area 21 attacks an adjusting device 20, additionally a guide head 40 of an adjusting element 35 takes up (see Fig. 13,14). The end faces 25 of the Connection areas 21 with almost complementary Bevels 29 and recesses 32 are provided 9 and 10.

A horizontal shift and the effect of a gap distance 36 of a connection area 21 are shown in FIG. 7 and Fig. 8. By facing towards the mill axis tooth-like bevels 29 on the end faces 25 the bead armor segments 10 and through a spacing gap 36 becomes with an adjustment in the direction of the mill axis associated reduction in circumference is taken into account. The history of the inner circular arc 38 of the bead armor segments 10 shows in the connection area 21 with a radial adjustment inside a largely continuous "constriction" of the Circular arc 38, which leads to a change in the grinding process of the fluid flow, especially in the area of Flow envelope of the fluid flow, leads.

Fig. 11 shows flow envelopes from which the influence of the angle of attack α of the blades of the blade ring 12 (see Fig. 1) and the angle of inclination β of the guide surface 34 emerges against a vertical (see FIG. 13). The flow envelopes 45 show the spatial Structure of the arrangement and the expansion of the flow envelope in terms of vertical and horizontal or radial Expansion and put in a unilateral axial Vertical section through a hyperboloid flow envelope outer boundary, the distance from a housing wall 3 and a fictitious intersection with the housing wall 3 as a point of impact of a hyperboloid torus from marginal zone or external semolina.

Depending on the angle of attack α and the angle of inclination β, the curves of the flow envelope 45 are different strongly curved. The curves of the flow envelope 45 according to FIG. 11 illustrate the influence of a Adjustment of bead armor segments in connection with a helical flow of a fluid flow Defined blades of a blade ring 12 on the shape of the hyperboloid torus and thus on the flow resistance, the throughput and in particular also on the excretion of fringe zones in one "Dead area" between the housing wall 3 and the curve of the Flow envelope 45 exercises. In this context is that of the curve of the flow envelope 45 with the Housing wall 3 formed "fictitious" intersection of importance, because this intersection is a kind of upper point of impact the greetings on the case and thus influence the size of the "dead area" between the housing wall 3 and the curve of the flow envelope 45 takes place in the Collect edge zone size that can be removed from the outside.

In a process that is optimized with regard to Energy balance border zone size at least partially below of the visible space from the grinding chamber, one can defined location of this point of impact for an optimal Positioning of a device for collecting and removing a portion of near-ventilated frit areas, for example a catch bag.

An adjusting device is shown in a schematic representation in FIG 20 shown, which at a connection area 21 engages with an adjusting element 35. In the starting position, the end faces 25 of the two are detachable connected bead armor segments 10 and an almost conical running distance gap 36 recognizable. The adjustment element 35 (Fig. 14) has a bolt shaft 37 and one Guide head 40 on which to receive a connecting bolt 18 (Fig. 13) is provided with a bore. Of the Guide head 40 is inserted into the connection area 21 and fixed. The bolt shaft 37, which is in the area the housing wall 3 by a sliding block Guide 41 is held, can be outside the housing wall be operated. The adjustment can be done manually, on mechanical, hydraulic or electromotive way.

Claims (19)

1. Method for grinding material of different granular sizes, in which the material is supplied to a rotary, horizontal grinding surface of a grinding-classifying chamber and crushed to grinding material particles, in which grinding material particles are supplied to a classifying process with the aid of a fluid feed flow, fine material particles are discharged and at least part of the oversize material occurring as coarse material particles is returned to the grinding surface, the fluid feed flow being supplied by means of an annular space with a blade ring between the grinding surface and a casing wall with adjustable reinforcing cladding segments, and in which from the grinding material particles thrown off over the edge of the grinding surface in a helical upward movement a flow envelope is formed as a virtually fine material-free, outer oversize material flow in the form of a hyperboloidtorus, whose spatial arrangement and structure are adjusted by the fluid feed flow,
   characterized in
   that the outer oversize material flow is at least partly taken from the grinding chamber and that the removal takes place in the area of the impact point of the hyperboloid torus on the casing wall.
2. Method according to claim 1,
   characterized in
   that the helical fluid feed flow is brought about with a speed of > 30 m/s by means of a gas guiding device producing a vortex and as the flow envelope is formed a virtually fine material-free, outer oversize material flow.
3. Method according to claim 1 or 2,
   characterized in
   that the curve of the flow envelope or the hyperboloid torus is additionally modified with the aid of an adjustable guide blade ring.
4. Method according to claim 3,
   characterized in
   that the flow envelope or the hyperboloid torus is set with the aid of inclination adjustable and/or horizontally displaceable reinforcing cladding segments.
5. Method according to claim 3 or 4,
   characterized in
   that the curve of the flow envelope or the hyperboloid torus is modified with the aid of partially adjustable reinforcing cladding segments.
6. Apparatus for crushing material, particularly an air-swept mill (4), which has an annular space (8) with a blade ring (12) for a fluid feed flow (13) beween a rotary grinding pan (6) and a casing wall (3) with adjustable reinforcing cladding segments (10), wherein the reinforcing cladding segments (10) are arranged so as to be at least radially displaceable,
   in particular for carrying out the method according to one of the claims 1 to 5,
   characterized in
   that the adjustable reinforcing cladding segments (10) are connected by connecting areas (21) and on at least one connecting area (21) acts an externally operable adjusting device (20).
7. Apparatus according to claim 6,
   characterized in
   that an adjusting device (20) is provided for operating several connecting areas (21).
8. Apparatus according to claims 6 or 7,
   characterized in
   that the connecting areas (21) are formed by connecting elements (23), which are located on end faces (25) of the reinforcing cladding segments (10).
9. Apparatus according to one of the claims 6 to 8,
   characterized in
   that the reinforcing cladding segments (10) are constructed as circular ring sectors and the connecting areas (21) are joints, particularly axial and fork joints.
10. Apparatus according to one of the claims 6 to 9,
    characterized in
    that a spacing gap (36) is formed between the rein-forcing cladding segments (10) and ensures a horizontal displacement and inclination adjustment of two adjacent reinforcing cladding segments (10) and a virtually sealed reinforcing cladding ring.
11. Apparatus according to one of the claims 6 to 10,
    characterized in
    that at least one frontal area of the reinforcing cladding segments (10) is provided with bevels (29) and/or recesses (32).
12. Apparatus according to one of the claims 6 to 11,
    characterized in
    that each reinforcing cladding segment (10) is constructed with a lower, almost horizontal sliding surface (28), an upper cover surface (22) roughly parallel thereto and a bevelled guide surface (34) inclined towards the grinding chamber axis.
13. Apparatus according to one of the claims 6 to 12,
    characterized in
    that the reinforcing cladding segments (10) are constructed with an inclination angle b continuously varying in circumferential direction.
14. Apparatus according to one of the claims 6 to 13,
    characterized in
    that the adjusting device (20) has an adjusting element (35), which is provided with a bolt shank (37) led out of the mill casing (3) and with a guide head (40) for arranging in a connecting area (21).
15. Apparatus according to claim 14,
    characterized in
    that the adjusting device (20) is manually, hydraulically or electromotively operable.
16. Apparatus according to one of the claims 6 to 15,
    characterized in
    that the number of radially displaceable reinforcing cladding segments (10) is determined by the number of grinding rollers (7).
17. Apparatus according to one of the claims 6 to 16,
    characterized in
    that an adjusting device (20) is provided in each case in front of a grinding roller (7), when viewing in rolling direction.
18. Apparatus according to claim 17,
    characterized in
    that stationary reinforcing cladding segments are alternatively arranged with inclination adjustable or pivotable reinforcing cladding segments.
19. Apparatus according to claim 17 or 18,
    characterized in
    that the inclination adjustable reinforcing cladding segments have horizontal pivot pins which are located in receptacles close to the casing wall.

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