EP1370373B1 - Screening panel and screening machine fitted with same - Google Patents

Abstract

The invention relates to a screening panel comprising screening elements which are arranged next to each other and which are detachably fixed to steel profile sections of a supporting structure by means of a separate profiled section made of plastic and which is mounted inbetween the screening elements. The plastic profiled section and the screening elements have corresponding engaging profiles which are held in a positive fit by fixing means which can be inserted from the top into the plastic profiled section. The plastic profiled section also has a base profile which can be engaged into the steel profile of the supporting structure. The plastic profiled section is embodied in the form of a profiled strip . The fixing means is embodied as a wedge strip and the engaging profiles are continuous in form. The upper area of the wedge has a continuous, groove-like recess which is open towards the top and the side walls thereof surrounding the engaging profiles are elastic, at least in the direction leading towards each other.

Description

The invention relates to a Siebbelag with juxtaposed sieve elements made of plastic, which are releasably secured by a separate, arranged between them plastic profile steel profiles of a support structure, wherein the plastic profile in an upper region and the sieve elements have on their the plastic profile facing end faces corresponding engagement profiles, the are held in positive engagement by means of an insertable from above into the plastic profile fastener, and the plastic profile has an engaging in the steel profile lower portion. It is also directed to a screening machine with such a screen covering.

Screen coverings of this type are used in particular for vibrating screens for coarse screenings. The support structure consists of longitudinally and / or transversely extending steel profiles in the machine frame, which are open at the top, for example in the form of C-profiles, or are formed as angle profiles with spaced-apart holes. On the upper straps or legs of these steel profiles, the sieve elements made of plastic, usually made of PU casting resin, placed side by side and / or one behind the other. They correspond in their dimensions the distances of the steel profiles of the supporting structure. The screen elements and their attachment must be designed so that they can absorb the loads of the screenings and the dynamic stresses occurring during operation, without being detached from the supporting structure. On the other hand, the attachment must be such that individual, worn screen elements can be easily replaced. These opposing requirements, namely sufficiently stable attachment on the one hand and easy solubility of the screen elements on the other hand, have led to different known constructions. In addition, it should be ensured that the screenings do not penetrate between the screen elements or between them and the support structure or in the steel profiles, as far as they are hollow.

In a known screen covering ( DE 34 25 485 A1 ) is inserted into the open top steel profile of the support structure, a separate, strip-shaped plastic profile having a continuous foot profile in its lower part, which engages resiliently latching in the open steel profile of the support structure, and in its upper region on both sides engagement profiles having with corresponding engagement profiles on the mutually facing end faces of the screen elements cooperates. The sieve elements themselves overlap with their end faces the plastic profile, which is thus covered by the sieve elements. At the top only a small gap between the end faces of the sieve elements is still present. Furthermore, the plastic profile directly above the foot profile on both sides cover strips, which rest on the steel profile of the support structure. Hereby, although an effective protection of the support profiles against ingress of screenings, water and the like is guaranteed, but during assembly, the relatively heavy sieve elements on the plastic profile be pitched. Likewise, the replacement of sieve elements requires considerable forces in order to solve the positive locking connection between the sieve and the plastic profile. For this purpose, appropriate tools or the like are needed to pry the heavy screen elements.

In a further known embodiment ( DE 199 18 824 A1 ) are provided instead of a continuous plastic profile individual mounting pins, wherein the interaction of the screen elements with the mounting pin is substantially the same. Also, the mounting pin engages latching in the open-topped steel profiles of the support structure. This requires a precise positioning of the sieve elements during assembly and disassembly a section-wise loosening of the sieve elements of the spaced pin. In one variant of this Siebbelags an expanding mandrel is driven into a corresponding through hole of the fixing pin, which ensures a better clamping of the pin on the steel profile. Consequently, a large number of expanding mandrels must be added during assembly. They also make it difficult to replace individual sieve elements.

Both of the aforementioned embodiments have the advantage that the sieve elements are flat on the top and bottom, whereby the casting of the sieve elements is facilitated and the mold costs can be kept low.

Another known screen covering ( DE 27 49 489 B2 ) consists of sieve elements which have at their mutually facing end faces downwardly projecting profiles, with which they engage in both sides of the open steel profile of the support structure. Between the mutually facing end faces of the sieve elements, there is a gap into which a wedge strip is driven in from above, which penetrates into the steel profile of the support structure and thereby spreads the integrally formed on the underside of the screen elements profiles below the opening of the steel profile of the support structure to the outside. To replace a sieve, the wedge bar must be pulled. For this purpose, corresponding depressions are provided on the surface of the sieve elements and transverse breakthroughs are provided on the wedge strip in order to be able to apply a hook-shaped pulling tool. In the trough-shaped depression at the top of the sieve sieve material is fixed and the trough and the wedge bar must first be exposed to attach the hook-shaped tool can. Also, the steel profile of the support structure is only inadequately protected against ingress of screenings or water.

Finally, a three-part design is known ( EP 0 567 361 B1 ) in which engages a separate plastic profile on the one hand in the open-topped steel profile of the support structure, on the other hand in the area above engagement profiles which cooperate with corresponding engagement profiles on the mutually facing end faces of the screen elements. The separate plastic profile has through-holes, into which in turn expanding mandrels can be driven in, which rest with their heads on top of the sieve elements. The expanding mandrel engages in the open steel profile of the supporting structure and spreads there the lower foot of the steel profile. In this way, the screen elements are fastened on the one hand to the separate steel profile and this on the other hand via the expanding mandrel on the steel profile of the supporting structure. A disadvantage is the projection of the heads of the expanding mandrels on the sieve surface and the lack of protection of the steel profiles of the supporting structure. Since the expanding mandrel both the forces in the terminal area of the screening elements and the forces for the attachment of the Apply plastic profiles to the support structure and must accommodate, apply correspondingly high forces for the replacement of individual sieve elements, and indeed several times due to the large number of expanding mandrels. Also, the plastic profiles can be unintentionally pulled out when lifting the screen elements.

In another known embodiment ( EP 0 118 800 ) with a separate plastic profile which is engaged in the steel profile, the screen elements are loosely on lateral flanges of the plastic profile. The plastic profile has on the upper side a recess into which a wedge strip can be driven in and latched over corresponding toothings. The sieve elements are clamped between a cross-sectionally hat-shaped head of the wedge strip and the side flanges of the profile strip. Also here is the loosening of the latched wedge bar power consuming and the resting on the sieve elements hat-shaped head of the wedge strip is undermined by Siebgut so that the screenings builds up under the head under the action of vibration.

The invention has for its object to enable easier assembly and disassembly of the screening elements and also to prevent the access of screenings and / or water to the steel profiles of the support structure.

Starting from a screen covering with the features of the preamble of claim 1 ( EP 0 567 361 B1 ), this object is achieved in that the plastic profile as a profile strip, the fastening means as a wedge strip and the engagement profiles are formed continuously, and in that the profile strip has a continuous, upwardly open, the wedge strip receiving, groove-like depression whose Enclosing profiles enclosing side walls are elastically yielding at least in the direction of each other, wherein the profile strip is recessed relative to the top of the screen elements, the wedge strip has a head profile which fills the space above the profile strip and between the end faces of the screen elements and substantially flush with the top of completes adjacent sieve elements.

In contrast to the closest prior art ( EP 0 567 361 B1 ) with individual profiled pins arranged at a distance so a continuous profile strip and instead of the expanding mandrels a continuous wedge strip is provided. The wedge bar is only responsible for a tight fit of the engagement profiles of profile strip and sieve elements, while the attachment of the profile strip is taken to the substructure solely by the foot profile. As a result, on the one hand the forces during insertion of the wedge strip, but also when releasing the same to replace the sieve elements are lower.

Compared with all known constructions, there is the advantage that the sieve elements can be mounted with very little effort. They are either pushed laterally with their engagement profile on the engagement profile of the profile strip or pushed from above. In this case, the resilient side walls of the channel-shaped depression soft inward elastically. Only after this pre-assembly of the sieve elements, which requires almost no effort, the final positive engagement between the engagement profiles on the sieve elements and the profile strip is made by the easy and easy to use wedge bar, which produces only forces acting on the side for positive engagement.

When replacing a screen element, the continuous wedge strip is first released. The force must be applied only at one end and can then easily remove the wedge strip over the entire length. The sieve elements can be easily lifted out, since the part of the profile strip facing them elastically deflects inwards.

It should be noted at this juncture that the term "wedge bar" does not necessarily imply a wedge shape, but rather includes any shape which ensures that the lateral engagement profiles of the profile bar are positioned or held in position; to ensure a tight fit with the engagement profiles of the screening elements. For this purpose, even a mere elastic deformation is sufficient, which also ensures a good seal at the top of the sieve elements. In addition, since the depression is closed at the bottom, at this point neither screenings, nor water can penetrate to the steel profiles of the supporting structure. This is further supported by the fact that the profiled strip is arranged sunk relative to the top of the sieve elements, wherein the wedge strip in particular has a head profile which fills the space above the profile strip and between the end faces of the sieve elements. In this way, a slightly wider surface on the wedge bar, which facilitates insertion and also, also in this area an elastic deformation in the region of the head profile and / or the sieve elements allows to obtain a gap-free connection.

It is further provided that the head profile of the wedge bar terminates substantially flush with the top of the adjacent sieve elements, so that there is a flat surface of the Siebbelags.

The profile strip preferably has a foot profile engaging into the steel profile of the supporting structure in its lower region.

In a preferred embodiment, the profile strip immediately above its foot profile on both sides passing, the steel profile of the support structure resting cover strips, which rest the sieve elements from above, so that even if screenings and / or water should penetrate between the sieve elements, in any case the steel profiles are protected.

In an advantageous embodiment, the engagement profile has on both sides of the profile strip on the upper side an inlet contour for the correspondingly formed engagement profile on the sieve elements. In the inlet contour, it may be z. B. be inclined surfaces, curved surfaces or the like, which only have the function to facilitate the placement of the screen elements from above.

In contrast, the engagement profile can be undercut on both sides of the profile strip on the underside, which is advantageous for a positive fit of the screen elements in the mounted position. The undercut does not interfere with the onset of the sieve elements, nor with their replacement, since only subsequently retrieved the wedge strip or be solved'wird, so that when inserting or replacing the sieve element, the wall of the profile strip can deform into the groove-like depression.

In order to fix the wedge strip in its final position, the channel-like depression of the profiled strip and / or the wedge strip can have latching means on their mutually facing sides. In addition or instead, the groove-like depression and / or the wedge strip can be profiled to increase the friction, wherein the profiling is possibly still elastically deformable to increase the adhesive forces between the wedge strip and the profile strip.

The head profile expediently extends over the entire length of the wedge strip, and instead may also be provided that the head profile is interrupted on the length of the wedge strip. The wedge strip and the head profile are integrally formed in an advantageous embodiment.

In a further development it is provided that in a support structure with upwardly open tube, box sections or the like, the foot profile of the profile strip is formed as a continuous elastically deformable profile. If, on the other hand, the supporting structure has profiles, for example angle profiles, with spaced-apart holes, the foot profile of the profile strip consists of correspondingly spaced locking pins.

Depending on the structure of the screening machine and the screen surface elements are provided in the edge region, which provide an edge seal against the housing of the screening machine or fulfill additional functions. Since two sieve elements of the same contour do not meet at this point, this connection can not be realized with the means provided for connecting the sieve elements to one another.

For this area of the screen surface may be provided, for example, that the edge element has a screen elements corresponding engagement profile and the wedge strip corresponding edge profile with a profile strip cross section corresponding to the head portion of the wedge strip and engaging in the trough-like depression of the profile strip section corresponding to the wedge strip.

In another embodiment, it may be provided that the edge element has at its the screen element to be connected facing a corresponding thereto engagement profile, in the open top steel profile of the support structure elastically engaging foot profile and above a the wedge strip receiving, groove-like depression.

The invention also relates to a screening machine with a screen covering of the aforementioned type.

Fig.1

einen schematischen Querschnitt durch den Siebbelag einer Siebmaschine;

Fig.2

eine Draufsicht auf einen Teil des Siebbelags gemäß Fig. 1;

Fig.3

einen vergrößerten Schnitt gemäß Fig.1 im Bereich eines Stahlprofils der Tragkonstruktion während der Montage;

Fig.4

einen der Fig.3 entsprechenden Schnitt nach der Montage;

Fig.5

einen vergrößerten Schnitt gemäß Fig.1 im Bereich eines der Randelemente;

Fig.6

einen gegenüber Fig.1 vergrößerten Schnitt im Bereich des anderen Randelementes;

Fig.7

einen der Fig.1 entsprechenden Schnitt bei anderem Einbau der Siebelemente;

Fig.8

eine Draufsicht auf die Siebfläche gemäß Fig.7;

Fig.9

einen gegenüber Fig.7 vergrößerten Schnitt im Randbereich;

Fig.10

einen Schnitt einer abgewandelten Ausführungsform der Profil- und der Keilleiste;

The invention will be described with reference to some embodiments shown in the drawing. In the drawing show:

Fig.1

a schematic cross section through the Siebbelag a screening machine;

Fig.2

a plan view of a portion of the Siebbelags of FIG. 1;

Figure 3

an enlarged section of Figure 1 in the region of a steel profile of the support structure during assembly;

Figure 4

one of Figure 3 corresponding section after assembly;

Figure 5

an enlarged section of Figure 1 in the region of one of the edge elements;

Figure 6

a comparison with Figure 1 enlarged section in the region of the other edge element;

Figure 7

a section corresponding to Figure 1 in other installation of the sieve elements;

Figure 8

a plan view of the screen surface of Figure 7;

Figure 9

a comparison with Figure 7 enlarged section in the edge region;

Figure 10

a section of a modified embodiment of the profile and the wedge strip;

1 has a housing 2 and a frame-like support structure made of parallel steel profiles 3, which are formed in the embodiment shown as a tube or box profiles in the manner of lying C-profiles and thus open at its top. Furthermore, the support structure on transverse, not shown in the drawing steel profiles. On the support structure of the Siebbelag 4, which consists of individual sieve elements 5 and edge elements 6 and 7, wherein If appropriate, the edge elements 6, 7 also assume a different function during the sieving process.

In the embodiment shown in Figure 1, the sieve elements 5, as Figure 2 shows, arranged in the direction of Siebguttransportes 8. So they have in this direction a much greater length than width. The sieve elements 5 are detachably fastened to the steel profiles 3 of the supporting structure at their two longitudinal sides, while the edge elements 6 and 7 are fixed to the steel profiles 3 only at their longitudinal sides facing the sieve elements 5 and at their outer longitudinal sides to angle profiles 9 on the screening machine housing 2 are fixed.

In Figures 3 and 4, the attachment of the sieve elements 5 is more apparent. The steel profile 3 of the support structure has on its upper side a continuous slot 10, which serves for releasably securing the screen elements 5. For fixing a profile strip 11 is provided, which engages with an elastically deformable base section 20 in the slot 10 of the steel section 3 latching. The profile strip 11 has in its upper region longitudinally extending engagement profiles 12, 13 which cooperate with corresponding engagement profiles 14, 15 on the profile strip 11 facing end faces 16, 17 of the screen elements 5. The profiled strip 11 further has in its upper region a groove-like recess 18 and in the region between the profile leg 20 and the engagement profiles 12, 13 on both sides projecting cover strips 19, 21, the both sides of the base profile 20 the steel profile 3 of the support structure rest on the upper side and the slot 10th cover. As a further part of the attachment, a wedge strip 22 is provided, which is formed from a narrow strip 23 with a head profile 24.

In the initial assembly, the profile strip 11 is first pressed with its base profile 20 in the slot 10 of the steel section 3 of the support structure, wherein the base profile 20 is first compressed elastically inwardly and spreads after passing through the slot 10 of the steel section 3 to the outside. At the same time the strips 19, 21 reach the rest on the top of the steel section 3. Subsequently, the sieve element 5 shown in Fig.3 is pushed with its engagement profile 14 on the engagement profile 12 of the profile strip 11 from the side or pushed from above, wherein the profile strip 11 on this side resiliently rebounded in the direction of the recess 18. Subsequently, the adjacent screen element 5 (Figure 4) is pressed from above, optionally with a slight inclined position, wherein the facing her wall of the profile strip 11 in the channel-like recess 18 elastically evades. After this pre-assembly of the sieve elements 5, the wedge strip 22 is pressed in from above until its head profile 24 fills the free space above the profile strip 11 and is flush with the surface of the sieve elements 5. In this case, the bar 23 of the wedge bar 22 urges the engagement profiles 12, 13 to the outside and there is a tight fit with the engagement profiles 14, 15 at the end faces of the sieve elements 5. The pre-assembly of the sieve elements 5 and the indentation of the wedge strip 22 can be done manually.

For the removal of a sieve element 5 only needs the wedge bar 22 at one end, for example, at the upper or lower edge in Fig.2, under attacked and pulled upwards. It can then be pulled out by hand over the entire length. Subsequently, the sieve element 5 can be easily lifted out, wherein the side facing him the profile strip 13 elastically dodges into the recess 18.

The profiled strip 11 has at the opposite opening edges of the recess 18 slightly inwardly projecting lugs 25 which engage in corresponding recesses 26 between the head profile 24 and the bar 23. Furthermore, the strip 23 may be provided on its surface with a weak profiling 27 with excess relative to the recess 18, which supports by increased friction, optionally supported by an elastic deformation, the tension of the wedge strip 22 in the recess 18.

5 shows the edge element 6 of Siebbelags 4 according to Figure 1, which forms the edge-side termination on the machine housing. It is essentially provided with the same screen openings as the screen elements 5. In the embodiment shown, the edge element 6 rests on the machine housing 1 on an angle section 9. At the screen elements 5 facing side, the edge element 6 is provided with a recessed engagement profile 28 which corresponds to the engagement profile 13 of the profile strip 11. Furthermore, the edge element 6 has a groove-like recess 29 corresponding to the recess 18 of the profile strip 11. Finally, the edge element 6 has a downwardly projecting profile leg 30, with which the edge element 6 is fixed by elastic spreading in the slot 10 of the steel profile 3. Above the profile foot 30, the edge element 6 rests with an offset step 31 on the one hand and a strip-like extension 32 on the other hand on the upper side of the steel profile 3. The edge element 6 and the adjacent screen element 5 are in turn fastened with the previously described wedge strip 22.

The edge element 7 according to FIG. 6, which may be designed, for example, as a membrane screen, is likewise located at one end Angle profile 9 on the housing 2 of the screening machine. On its side facing the sieve elements, another embodiment for the connection is shown. For this purpose, the usual profile strip 11 described above is provided which has the engagement profile 12, 13 and the recess 18 on both sides. In this embodiment, the edge element 7 - as the sieve elements 5 (Fig. 2, 3) - formed flat on the top and bottom. It has at its the sieve elements 5 facing end side a strip-shaped profile 33 corresponding to the engagement profile of the screen elements and the profile strip 11 cross section 34 with an integrally formed on the underside of the wedge strip 35 which engages in the recess 18 of the profile strip 11. In this way, can be connected to the edge element 7 of the above-described screen element 5 in the same manner.

7 and 8 show another variant of a screening machine, in which the sieve elements are arranged transversely to the Siebguttransport 8. The attachment of the sieve elements 5 to the steel profiles 3 of the support structure is carried out in the same manner, as described above, namely by means of the profile strips 11 and the wedge strips 22. As a conclusion at the inlet and the outlet side of the screenings edge elements 36 are provided, one of which Fig.9 is shown enlarged. Such edge element 36 has, like the edge element 6 according to FIG. 5, a profile designated overall by 37 and a foot profile 38 on its front side facing the sieve elements. By means of the latter, the edge element 36 is inserted elastically spreading in the slot 10 of the steel profile 3. Furthermore, the screen element has a groove-like recess 39 for receiving the wedge strip 22, which terminates flush with the top of the edge element 36.

In the embodiment according to FIG. 10, the groove-like depression 18 is provided with an enlargement 40 in the lower region. The wedge strip 22 has at the lower end of the bar 23 a latching foot 41 which engages after pressing the wedge strip in the extension 40. Further, but not necessarily, the head profile 24 of the wedge bar 22 is provided with a chamfer 42, which cooperates with a complementary to the contour of the chamfer 42 projection on the front side of the adjacent sieve elements (not shown), so that the wedge strip 22 in addition to the Screen elements is fixed and the surface of the head profile 24 of the wedge bar 22 with the top of the sieve elements, for example forms a flat surface or even surmounted the surface of the screen elements in order to divert the screenings on the screen surface. The elevation 42 may in the latter case over the entire length of the head profile 42 of the wedge strip 22 pass through or be formed only partially with a projection with respect to the screen surface to force a migration of the screenings transverse to the wedge strip 22. Alternatively, the chamfer 42 may also be provided on the end faces of the sieve elements and the projection on the sides of the wedging bar 22 facing the latter or of the head profile 42 of the wedging bar 22 (not shown). In such a screen lining, the channel-like depression 29 of the edge element 6 according to FIG. 5 is equipped with a corresponding extension 40 and / or the molded-in wedge strip 35 of the edge element 7 according to FIG. 6 with a corresponding latching foot 41.

Claims (15)

1. Screening cover (4) with juxtaposed screening elements (5) made from plastic, which are detachably fixed by means of a separate plastic section (11) located between them to steel sections (3) of a supporting structure, the plastic section (11) having in an upper area and the screening elements (5) in their front end (16, 17) facing the plastic section (11) corresponding engagement sections (12, 13; 14, 15), which are held in positive engagement by means of a fixing means (22) insertable from above in the plastic section (11), which is equipped with a lower area engaging in the steel section (3), characterized in that the plastic section is constructed as a profile strip (11), the fixing means as a taper gib strip (22) and the engagement sections (12, 13; 14, 15) in a continuous manner and that the profile strip (11) has a continuous, top-open, channel-like depression (18) receiving the taper gib strip (22) and whose side walls enclosing the engagement sections (12, 13; 14, 15) are elastically resilient at least in the direction towards one another, the profile strip (11) being countersunk with respect to the top of the screening elements (5), the taper gib strip (22) has a top section (24) filling the free space above the profile strip (11) and between the front ends (16, 17) of screening elements (5) and terminating essentially flush with the top of the adjacent screening elements (5).
2. Screening cover according to claim 1, characterized in that in its lower area the profile strip (11) has a base section (20) engaging in the steel section (3) of the supporting structure.
3. Screening cover according to claim 1 or 2, characterized in that, immediately above the base section (20), the profile strip (11) has bilaterally continuous cover strips (19, 21) resting on the steel section (3) and on which the screening elements (5) bear from above.
4. Screening cover according to one of the claims 1 to 3, characterized in that on both sides of the profile strip (11) engagement section (12, 13) is provided at the top with an entry contour for the correspondingly constructed engagement section (14, 15) on screening elements (5).
5. Screening cover according to one of the claims 1 to 4, characterized in that on both sides of the profile strips (11), the engagement section (12, 13) is bottom-undercut.
6. Screening cover according to one of the claims 1 to 5, characterized in that the channel-like depression (18) of profile strip (11) and/or taper gib strip (22) is provided on the facing sides with locking means (25, 26; 40, 41).
7. Screening cover according to one of the claims 1 to 6, characterized in that the channel-like depression (18) of profile strip (11) and/or taper gib strip (22) is profiled in friction-increasing manner on the facing sides.
8. Screening cover according to one of the claims 1 to 7, characterized in that the top section (24) extends over the entire length of the taper gib strip (22).
9. Screening cover according to one of the claims 1 to 7, characterized in that the top section (24) is interrupted on the length of the taper gib strip (22).
10. Screening cover according to one of the claims 1 to 9, characterized in that the taper gib strip (22) and top section (24) are in one piece.
11. Screening cover according to one of the claims 1 to 10, characterized in that in the case of a supporting structure with steel sections (3) in the form of top-open pipe, box or similar sections, the base section (20) of profile strip (11) is constructed as a continuous, elastically deformable section.
12. Screening cover according to one of the claims 1 to 11, characterized in that in the case of a supporting structure, whose steel sections have spaced holes, the base section (20) of profile strip (11) comprises correspondingly spaced locking pins.
13. Screening cover according to one of the claims 1 to 12 with a marginal element (7) diverging from screening elements (5) and which is detachably fixed by one side to a steel section (3) of the supporting structure, characterized in that on this side the marginal element (7) has an engagement section (33) corresponding to the screening elements (5) and a marginal section (34, 35) corresponding to the taper gib strip (22) with a portion (34) engaging over the profile strip (11) corresponding to the top section (24) and a portion corresponding to the taper gib strip (22) engaging in the channel-like depression (18) of profile strip (11).
14. Screening cover according to one of the claims 1 to 12 with a marginal element (6) diverging from the screening elements (5) detachably fixed by one side to a steel section (3) of the supporting structure, characterized in that the marginal element (6) on its side facing the screening element (5) to be connected has an engagement section (28) corresponding thereto, a base section (30) engaging in the steel section (3) of the supporting structure and above the same a channel-like depression (29) receiving the taper gib strip (22).
15. Screening machine (1) with a screening cover (4) according to one of the claims 1 to 14.

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