EP1114218B1 - Sieving device - Google Patents

Abstract

A screening device includes a screening element connected to a reinforcing element by a frictionally engaging clamping connection. Spacers located between the screening element and the reinforcing element provide a radial clearance therebetween. The screening element can be replaced when worn out, while the reinforcing element and associated parts can be reused with a new screening device. For this purpose, the screening element can be detached from the reinforcing element, which provides the actual support function, as a single unit by way of the frictionally engaging clamping connection. The clamping connection can be implemented by way of wedges or a conical seat.

Description

The invention relates to a screening device, which especially for fiber suspensions in the paper industry is determined and for example in sorters, such as Pressure sorters or the like is used.

Such a screening device comprises a screening surface forming, essentially cylindrical sieve device, which in the form of a slotted screen mat or in the form of a Sieve plate with drilled or milled / sawn sieve slots can be trained. Especially with sorters is such a screening device of a high static and exposed to dynamic stress. Therefore in usually a spacer element of the cylindrical screen device assigned, and the cylindrical screening device with the spacer is spaced radially a reinforcing device supported, which for example can be designed as a reinforcing jacket. To position the screening device, use the axial Ends of the screening device closing elements, for example be provided in the form of end rings. With the usual The respective final element becomes a design with the reinforcement device and the sieve device welded, the screen device being assembled first and then the amplification device from positioned outside over the screening device and then attached becomes. Finally, the end-ring-shaped Closing elements with the cylindrical sieve device and the reinforcing device extending in the circumferential direction connected. The weld seams to be created here the welded connections are only accessible on one side and due to the high static and dynamic Loads can lead to notch stresses, so that the durability of such a screening device in particular highly dependent on the quality of the weld seam connections is.

In the usual use of screening devices is mainly the screening device is exposed to severe wear, while the reinforcement device is often a very long one Has lifespan. Through the welded connection of the screening device with spacer and reinforcement device Formation of the screening device must, however, after wear Screening device replaced the entire screening device become what is expensive and time-consuming.

From DE 39 42 484 A1 a sorter with a screen basket is known, in which over separate bearing points axially spaced in the longitudinal direction of the strainer basket in the form of bearing rings, a support for the screen basket in connection with assigned counter-bearing elements on the sorting housing. With help a frictional clamping connection comprising wedge strips and the like the strainer basket is determined via the bearing points. Furthermore are additional seals are provided for the clamp connection. The intended Support construction is on the one hand very complex and extensive many individual parts. Furthermore, the axially spaced bearing points only radial forces, but no torsional forces are absorbed. Also the strainer basket is only supported directly on the sorter housing so that an adaptation to differently designed sieve baskets or sieve devices only by a corresponding change in the main support function fulfilling sorter housing is possible because in addition to the sorter housing provided reinforcement devices are missing, against which the Sieve basket could support.

From EP-0 471 195 A1 and the assigned US-A-5,200,072 are sieve plates, sieve cylinders and processes for their production known. With a cylindrical screening device the interpretation is made such that the screening device or the corresponding sieve part detachable and replaceable with a support cylinder serving as a reinforcement device connected is. To the manufacturing costs and the manufacturing time to reduce therefore needs a worn one Screening device to be replaced only during the Reinforcement device, in particular the support cylinder, can be reused. For detachable connection of Screening device and jacket-shaped reinforcement device the outside diameter of the sieve device is slight larger than the inside diameter of the support cylinder. By means of a temperature-dependent shrinking process then the screening device and the reinforcing device fixed to each other, and if necessary can this connection, for example by means of Welding, riveting, screwing, glue, solder or the like are finally secured.

In US-A-4 954 294 and US-A-5 023 986 is a strainer basket construction with a modular structure consisting of several small screen cylinder elements known in ring form. The individual screen cylinder modules are interchangeable and are marked by notches positively connected with reinforcement rings. The axial end rings are formed by a large number of tension rods braced against each other. The axial tie rods will be at the same time through holes in the reinforcement rings guided.

Sieve cylinders are offered by J & L Fiber Services, Inc. where a variety of short rod-shaped elements positively positioned in the grooves of reinforcing rings and is fixed in position by means of tie rods. Installation is time consuming and expensive. To defective and worn rod-shaped elements of the screening device To replace, the entire screen cylinder must be in its individual parts be disassembled.

For example, a sieve basket is known from EP-A-0 724 037, in the case of the profile bars with form-fitting rings get connected.

The invention aims to provide a screening device which especially for fiber suspensions in the paper industry is intended to provide which at a constructive simple interpretation an economic reuse of those that are not so exposed to wear Parts of the screening device, such as the reinforcing device, allowed in a cost-effective manner, the Screening device and the reinforcing device reliable and dynamically and statically resilient.

For this purpose, according to the invention, a screening device, in particular for fiber suspensions in the paper industry, provided which forms a sieve surface has essentially cylindrical screening device, which is spaced on a radial by means of spacers arranged reinforcement device is supported, wherein the screening device is interchangeable and non-positively fixed to the reinforcement device , in which further the screening device and the reinforcing device by means of a frictional clamp connection are releasably connected and the clamp connection the screening device by means of an axial Cone seat effect on the reinforcement device.

With this screening device according to the invention, thus the actual sieve device, which is the sieve surface forms, detach from the reinforcement device again, when the heavily used screening device is worn out. The amplification device, however, can be after Replacing the sieving device again with the sieving device deploy. The inventive design of the screening device makes use of the knowledge that the screening device with the screening surface, if necessary Interaction with spacer elements mainly only actual screening and / or visualization function realized, while the actual carrying function for the screening device and for inserting the screening device into the respective Machine taken over by the reinforcement device becomes. By defining the screening device in cooperation with the spacer elements by means of a clamp connection on the reinforcement device is achieved that the clamp connection over the entire circumference of Screening device and reinforcing device act distributed can, so that the frictional clamping connection reliable the screening device rotatably with respect to the reinforcing device only by additionally applied Can set clamping forces. Through this frictional Clamping connection is a relative rotation of the Screening device compared to the reinforcing device prevented and the screening device becomes rotationally fixed on the reinforcing device established. But this connection is so detachable that essentially without damaging the Reinforcing device, the sieve device is released from this can be. Thus, the invention allows multiple Use of the reinforcement device while the Intended use of the sieve device highly susceptible to wear Screening device with the essentially cylindrical screen surface as a whole and can be exchanged uniformly is. In other words, the core idea is Invention to be seen in that not the individual sieve elements the screening device, such as in parallel arranged rod-shaped sieve elements, in case of wear exchanged and replaced, but that the Entire screening device, which is a prefabricated unit forms, is interchangeable, and that in particular the actual Support function and the corresponding adjustment of the Sieving device to the machine, like a sorter, over the amplification device is carried out separately and manufactured and designed independently of the screening device can be. By such a separation of the sieve function and carrying and / or adapting functions can each be used for this certain parts of the screening device, i.e. the screening device and / or the reinforcing device, taking into account the required requirements and be interpreted without mutual compromise leading votes are required. hereby The respective freedom of design also improves with regard to the design of the screening device with the essentially cylindrical screen surface and the supporting function receiving reinforcement device, wherein distance devices or spacer elements the screen area of the Screening device radially spaced from the reinforcing device holds or hold.

In the screening device according to the invention is thus omitted an integral connection, such as a welded connection, between reinforcement device and sieve device. Due to the interchangeability of excessive wear inclined screening device and by reuse the reinforcement device is achieved in the invention designed screening device a reduction in Material usage. Furthermore, the screening device can be opened inexpensive way to get them back and the unsealed ones Parts can be reused. Let too sieve devices according to the invention with clearly restore and retrieve less time, there in the recovery and restoration not all for the original manufacture of the screening device required manufacturing steps performed must be, but some of them can be omitted. In particular, the screening device according to the invention allows also the realization of a modular construction with all the advantages of a modular system in terms of Manufacturing and warehousing. For example, if necessary, screening devices in standard sizes as well assigned reinforcement devices in standard sizes prefabricate, which then according to the application requirements assembled and assembled into a screening device can be. The invention also allows Screening device possibly an inexpensive Retrofitting if a due to changing requirements Screening device of another design, for example, to achieve better performance results should be used without that the sieve device itself is no longer worn is useful.

All of the above advantages can be seen in combine the screening device according to the invention, in particular the aspect of the releasable connection of actual screening device and reinforcing device plays a major role. By according to the invention The intended frictional clamp connection is Screening device with the essentially cylindrical screen surface fully and reliably positioned fixed to the reinforcement device.

Alternatively, the clamp connection in the invention Screening device can also be realized in such a way that the screening device by means of an axial conical seat effect is fixed to the reinforcement device. With such an embodiment, the outer surfaces act the spacer elements of the screen surface Screening device, which is conical in the axial direction Have course with a suitable and a conical connection realizing a positive connection Design of the reinforcement device together. Practically it can be said that with this construction of the screening device the clamp connection between screening devices with spacers and reinforcement realized by means of an axial press cone seat connection becomes. In other words, the sieve device forms a sieve insert with an essentially cylindrical inner surface as a screen surface and an axially conical External surface, which is formed by spacer elements. On such sieve insert becomes the formation of the sieve device according to the invention in a correspondingly conical in axial Reinforcement device designed in the direction, for example used in the form of a reinforcing jacket, and through the conically opposing seats the clamp connection of the sieve device or sieve insert and reinforcement device manufactured.

According to a preferred embodiment, the clamp connection is established the screening device by means of frictional engagement, preferably wedge action on the reinforcing device firmly. For this purpose, clamping devices and / or clamping elements with frictional engagement, preferably wedge action for manufacture the non-positive connection used.

The clamping connection can preferably be clamping elements include which to form the clamp connection radially movable in the direction of the reinforcing device are. With such a configuration it is achieved that the type, number and arrangement of the clamping elements Production of the clamp connection according to the Requirements such as size and intended use or the like, can be selected.

In one embodiment, the clamp connection Clamping elements used, which are I-shaped in cross section are trained. One cross leg is against the Screening device and the other against the spacer elements on. Such a clamping element can preferably be in the form one running in the axial direction of the screening device Groin be trained. With such an embodiment becomes the sieve device with sieve surface and spacer elements compared to the reinforcement device in such a way braced that the screen sections by the clamping element the screen area with the assigned spacer elements in Expanded circumferential direction and against the reinforcing device be tense. If the clamping element is in shape a bar running in the axial direction is formed, such a terminal block in the axial direction of one end to the other end of the screening device driven between the screen sections of the screening device and thereby the screening device against the reinforcing device be stretched under spread.

In one embodiment, the clamping elements are wedge elements trained which is a radial tightening direction have to form the clamp connection. Such Wedge tightening connection can be in the interaction of wedge element and spacer by appropriate training of reciprocally cooperating wedge suit bevels become. Here come different designs of corresponding wedge elements into consideration.

According to an alternative embodiment, the clamping element Be T-shaped, and the cross leg of the "T" can rest on the sieve. Conveniently, can the T-shaped in this embodiment Clamping element in the form of an axial direction of the screening device or do this at an angle or spiral Rail or bar should be designed so that one a suitable surface pressure for the one to be manufactured Receives clamp connection at the screening device.

The T-shaped clamping element can be in two parts be designed, one on the screen surface of the screening device resting cross leg part and a spacer penetrating longitudinal leg part may be provided can. Fixing and tensioning on non-positive Way with the reinforcement device can then, for example done via a screw connection. This can one prefabricates several for the non-positive connection Use individual parts and partly standard parts to to be able to realize favorable manufacturing costs.

The clamping elements of the clamp connection are by means of at least one tightening element can be moved in the radial direction. The tightening element can be in the form of a screw, rivet or Bolt connection with the clamping element for radial Movement of the same work together.

The respective tightening element is preferably after manufacture the clamp connection on the reinforcement device fixable. There are different ways of defining such as welding or the like. Possibly postprocessing can also be done at which, for example, that on the amplification device specified tightening elements at the transition areas or reworked in another way. Also can optionally in the manufacture of the clamp connection The resulting joints are integrally fused become.

The tightening element in the screening device according to the invention passes at least partially through the reinforcement device in the radial direction. The pull-through element preferably penetrates the reinforcement device completely and for the Establishment of the clamp connection is the tightening element from the outside of the reinforcement device applied.

According to a further preferred embodiment according to the invention is for the axial fixation of the screening device on at least one axial end face of the screening device a closing element, preferably detachable, with the reinforcing device connected, whereby the screening device in is positioned in the axial direction. This final element can be designed in the form of a ring, such as an intrusion be, and the end element can be on the machine side Adapt requirements as a kind of adapter piece and lay out. Comprehensive through such a three-part design a screening device, a reinforcing device and front end elements in the form of penetration or cover rings, the reinforcing device can for example in the form of a reinforcement jacket independently from the machine adaptation for the intended Use of the screening device can be designed so that the manufacture of the same is simplified. The respective Adjustment then takes place via the closing elements or End rings, which act as a kind of adapter for each Intended use in the desired machine, such as a sorter.

As detachable connections between the end element and the reinforcement device come pin connections, screw connections and the like.

In the screening device according to the invention this can essentially cylindrical screen surface of the screening device from a slotted screen mat and / or portions thereof be, or the substantially cylindrical screen surface can from a sieve plate and / or sections thereof be formed. Thus, with the invention Screening device all the usual designs of Screening devices and screen elements, such as slotted screen mats or appropriately rounded sieve plates are used, in which by means of mechanical removal processing appropriate sieve openings are cut.

In the screening device according to the invention, the Screening device spiral screen slots or Screen gaps on the screen surface formed by the screen device to have.

The reinforcement device can be in the form of a reinforcement jacket be formed, which with passages is provided and referred to as a so-called backup jacket becomes. In order to ensure the stability of the screening device compared to a can increase radial pressure load, the reinforcing device on the outside additionally with reinforcement rings be provided.

If a screening device has at least one closing element, for example in the form of an end ring on or has axial end faces, so in the invention Interpretation of the closure element accessible from both sides on the Reinforcement device before placing the screening device be welded with the spacers. On in this way the invention allows the screening device assembled from the inside out when assembling the parts and can be built, taking to create the weld to connect the closure element and Reinforcement device accessible from both sides is and therefore a high quality of the heavily used Weld seam connection can be ensured. Also can notch effects on such a weld joint reduce this accessibility from both sides. This can create a permanent and strong connection of closure element and reinforcement device be ensured. The screening device with the spacer elements is then after the connection of the final element and reinforcement device arranged and applied, and then finally the frictional connection to fix sieve with spacer and Reinforcement device manufactured. Through this design assembly and disassembly are therefore easier the screening device as a whole.

The screening device with the spacer elements is preferred with the interposition of an insert tape compared to the End element positioned in the axial direction. Through a such insert tape can be another weld for fixing and axial positioning of the sieve device avoid with the spacers. This too assembly and disassembly are even easier further, and tolerances in the axial direction of the Screening device effective with the help of such an insert tape compensate.

By a relative shift in the circumferential direction of the screening device with spacers and reinforcement device even in the event of strong tangential loads To effectively avoid shear forces transferring pinning made if necessary become. This relieves the burden on Shear-sensitive connections, such as screw connections and welded joints, and such pinning permits the transfer of those occurring in the field Shear forces directly on the reinforcement device. In particular, this can be an additional anti-rotation device reached by screening device and reinforcing device be so that you have a permanent positive Connection with the screening device without adverse effects of shear forces on the positive connection can ensure.

It is essential in the screening device according to the invention therefore, that one is an inexpensive reuse of components of a screening device that are not as susceptible to wear with the simplest possible structure of the screening device receives what the screening device with the spacers by means of a frictional clamp connection without a material connection to the reinforcement device is set. This can lead to wear Screening device can be replaced without the entire screening device must be destroyed and disassembled. Even if terminating elements at the axial ends of the screening device are provided, they are only cohesive with the reinforcement device but not with connected to the screening device and the spacer elements. As a result, the screening device can, for example, by a partial dismantling of the screening device can be replaced, wherein the connection of closure elements and reinforcing device is maintained unchanged.

Fig. 1

eine perspektivische Ausschnittsansicht einer Siebvorrichtung nach der Erfindung,

Fig. 2

eine schematische Ausschnitts-Querschnittsansicht einer Klemmschlußverbindung als reibschlüssige Verbindung mittels eines Keilelements, welches in radialer Anzugsrichtung unmittelbar mit einem Distanzelement zusammenwirkt,

Fig. 3

eine schematische Ausschnitts-Querschnittsansicht zur Verdeutlichung einer abgewandelten Ausführungsform einer Klemmschlußverbindung mit einem Keilelement nach Figur 2, wobei als Anzugselement eine Stufenschraube eingesetzt wird,

Fig. 4a und Fig. 4b,

jeweils eine schematische AusschnittsQuerschnittsansicht zur Verdeutlichung einer Bolzenanordnung für ein Anzugselement einer Klemmschlußverbindung bei der erfindungsgemäßen Siebvorrichtung,

Fig. 5a und Fig. 5b

jeweils eine schematische Ausschnittsansicht mit einer Nietanordnung als Anzugselement für eine Klemmschlußverbindung bei der erfindungsgemäßen Siebvorrichtung,

Fig. 6

eine schematische Ausschnitts-Querschnittsansicht zur Verdeutlichung einer Ausführungsvariante eines Klemmelements, welches T-förmig ausgebildet ist, wobei der Querschenkel des "T" bei der Herstellung der Klemmschlußverbindung flächig gegen die Siebeinrichtung anliegt,

Fig. 7

eine schematische Ausschnitts-Querschnittsansicht zur Verdeutlichung einer weiteren Ausführungsform einer Klemmschlußverbindung mit zweiteiligem Klemmelement,

Fig. 8a und Fig. 8b

jeweils eine schematische Ansicht einer Ausführungsvariante, bei welcher ein T-förmig ausgebildetes Klemmelement in Form einer in axialer Richtung der Siebvorrichtung oder unter einem Winkel hierzu verlaufenden Schiene ausgebildet ist,

Fig. 9

eine schematische Ausschnitts-Querschnittsansicht zur Verdeutlichung einer Ausführungsvariante einer kraftschlüssigen Verbindung mittels einer im Querschnitt I-förmig ausgebildeten Leiste,

Fig. 10

eine perspektivische Ausschnittsansicht einer Siebvorrichtung mit einem lösbaren an einem axialen Ende vorgesehenen Abschlußelement,

Fig. 11

eine Figur 10 ähnliche Ansicht einer Ausführungsvariante einer lösbaren Verbindung von stirnseitigem Abschlußelement an der Verstärkungseinrichtung bei einer Auslegungsform einer erfindungsgemäßen Siebvorrichtung,

Fig. 12

eine schematische Schnittansicht einer alternativen Ausführungsform einer reibschlüssigen Klemmschlußverbindung von Siebeinrichtung und Verstärkungseinrichtung bei einer erfindungsgemäßen Auslegungsform einer Siebvorrichtung, und

Fig. 13

eine perspektivische schematische Ausschnittsansicht einer Siebvorrichtung mit einer spiralförmigen Orientierung von Siebschlitzen an der Siebfläche der Siebeinrichtung.

The invention is explained below with reference to preferred embodiments with reference to the accompanying drawings. It shows:

Fig. 1

2 shows a perspective cutout view of a screening device according to the invention,

Fig. 2

2 shows a schematic cross-sectional view of a clamp connection as a frictional connection by means of a wedge element which interacts directly with a spacer element in the radial tightening direction,

Fig. 3

2 shows a schematic cross-sectional view to illustrate a modified embodiment of a clamp connection with a wedge element according to FIG. 2, a stepped screw being used as the tightening element,

4a and 4b,

each a schematic sectional cross-sectional view to illustrate a bolt arrangement for a tightening element of a clamp connection in the screening device according to the invention,

5a and 5b

each a schematic detail view with a rivet arrangement as a tightening element for a clamp connection in the screening device according to the invention,

Fig. 6

2 shows a schematic cross-sectional view to illustrate an embodiment variant of a clamping element which is T-shaped, the transverse leg of the "T" lying flat against the screening device during the production of the clamping connection,

Fig. 7

2 shows a schematic cross-sectional view to illustrate a further embodiment of a clamp connection with a two-part clamp element,

8a and 8b

in each case a schematic view of an embodiment variant in which a T-shaped clamping element is designed in the form of a rail running in the axial direction of the screening device or at an angle thereto,

Fig. 9

2 shows a schematic cross-sectional view to illustrate an embodiment variant of a non-positive connection by means of a strip with an I-shaped cross section,

Fig. 10

2 shows a perspective cutout view of a screening device with a detachable end element provided on one axial end

Fig. 11

FIG. 10 shows a view, similar to FIG. 10, of an embodiment variant of a releasable connection of the front end element on the reinforcing device in a design of a screening device according to the invention

Fig. 12

is a schematic sectional view of an alternative embodiment of a frictionally locking connection of the screening device and reinforcing device in a design of a screening device according to the invention, and

Fig. 13

a perspective schematic sectional view of a screening device with a spiral orientation of screen slots on the screen surface of the screening device.

In the figures of the drawing are more exemplary embodiments and design variants described, which only as examples without any restrictive character serve.

Figure 1 relates to a first embodiment a sieve device designated overall by 1. The Screening device 1 comprises a screen device 2, spacer elements 3, a reinforcing device 4, and an axial, frontal end element 5. The screening device 2 comprises rod-shaped sieve elements 6, which also act as sieve rods are referred to, and which are essentially parallel and spaced axially parallel to the screening device 1 in this way are arranged that between two adjacent rod-shaped sieve elements 6 sieve slots 7 or sieve gaps 7 are formed. To comply with the predetermined arrangement the rod-shaped sieve elements 6 are in a corresponding manner Specified on the spacers 3, which preferably axially spaced in the circumferential direction of the screening device 2 run. The spacer elements are expedient 3 ring-shaped. The rod-shaped sieve elements 6 or the sieve bars form together with the spacer elements 3 a screening device 2, the inner surface 8 of the screening device 1 is a substantially cylindrical Sieving surface 9 forms which the sieve slots or Sieve column 7 contains.

The front end elements 5, which in the form of a End ring is formed is in the illustrated embodiment according to Figure 1 via a welded connection 10 connected to the reinforcement device 4, which expediently designed in the form of a reinforcing jacket which corresponding breakthroughs are not shown) Has. The weld joint 10 is on both sides accessible and therefore can be reliably Weld seam with the desired quality, for example in shape create a double fillet weld 10 as shown. The sieve device 1 is from the inside to the assembly assembled and assembled on the outside.

The screening device 2 is by means of a frictional Clamping connection on the reinforcement device 4 set such that in the finished state Sieving device 2 is not relative to the reinforcing device 4 can twist. In the example shown is one explained in more detail below Wedge connection 11 is provided as a clamp connection. The wedge connection 11 is in the example shown as one running in the axial direction of the screening device 1 Wedge rail formed. For the axial positioning of the Screening device 2 and its rod-shaped screen elements 6 an insert tape 12 between the end element 5 and the assigned screening device 2 is provided, which at the same time in the assembled state, the welded joint 10 in Direction to the inside of the screening device 1 covered.

With the help of the clamping connection designed as a wedge connection 11 becomes the screening device 2 with the spacer elements 3 frictionally with the reinforcement device 4 in the form of a reinforcement jacket or backup jacket releasably connected. The screen surface 9 of the screen device 2 is radially spaced from the reinforcement device 4 arranged by means of the spacer elements 3. By means of clamping and The screening device 2 on the Reinforcement device 4 fixed in rotation.

When the screening device 2 is in the intended use state is used up or due to signs of wear unfavorable performance parameters are achieved, can thanks to the design of the screening device according to the invention 1 provided frictional clamp connection the screening device 2 with the spacer elements 3 expanded as a unit and replaced with a new one become. The clamp connection is designed for this for example in the form of a wedge connection 11, solved, and the screening device 2 can be removed without the Reinforcement device 4 significantly damaged or even gets destroyed. After installing a new screening device 2 in a rotationally fixed arrangement by means of the frictional Clamping connection, for example in the form of a wedge connection 11 with the reinforcement device 4 and, if necessary provided final element 5 can then Screening device 1 again as intended in a corresponding Machine, such as a sorter (not shown), be used.

With the help of FIGS. 2 to 10, embodiment variants are shown schematically of frictional clamp connections explained in more detail.

Figure 2 shows a wedge connection 11 ', which one or comprises a plurality of wedge elements 14, which are in the radial tightening direction directly with the spacer 3 of the screening device 2 work together, in the spacers 3 corresponding complementary wedge-shaped openings 15 are provided. By means of a screw 16 the wedge element 14 in the radial tightening direction, in FIG. 2 towards the left, and this will cause the Screening device 2 with the spacer elements 3 frictionally connected to the reinforcement device 4 by means of clamps.

Although not shown in more detail, can in axial Direction of the screening device 1 preferably over several in Surface lines distributed several wedge elements 14, which serve as clamping elements, may be arranged.

Figure 3 shows a frictional clamp connection in Form of a circular connection 11 ". In deviation from FIG. 2 the tightening element is here a step screw 17 formed, which in a corresponding threaded bore of the engages each wedge element 14 '. After the frictional Clamping by clamping Clamping the screening device 2 and reinforcing device 4 can then be the stepped screw 17 on the reinforcement device 4, for example be determined by the head of the stepped screw 17 separated and ground the surface and, if necessary a material connection of step screw 17 and reinforcing device 4 is created. Even in the embodiment 3 is the clamp connection Radial tightening direction for establishing the clamp connection of screening device 2 and reinforcing device 4th

In the design of the clamp connection according to FIGS. 4a and 4b is a bolt 19 as a tightening element used, which in a similar manner as in Figure 3 a wedge element 14 "cooperates, and after the Applying force in the direction of arrow F, i.e. with a tractive force, separated and for example by means of a Welded connection 20 fixed to the reinforcement device 4 becomes. The protruding part of the bolt 19 can then separated and ground if necessary.

A further embodiment variant is shown in FIGS. 5a and 5b a clamp connection by means of clamping elements 14 "'. This clamp connection is also a bolt there designated 19 'is used, the but in contrast to the design form according to Figures 4a and 4b for tightening not with a tractive force but with a compressive force is applied. The determination of the Bolt 19 'as a tightening element after manufacture of the non-positive Connection on the reinforcement device 4 can in the same or similar manner as in Figures 4a and 4b shown.

In the schematic in Figure 6 in a cross-sectional view Clamping connection shown is a T-shaped in cross section trained clamping element 21 used.

As shown in Figures 8a and 8b, the T-shaped Clamping element 21 in the form of an axial direction the screening device 1 or at an angle to it Rail 22 are formed. The cross leg 23 of the cross-sectionally T-shaped clamping element 21 rests the screen surface 9 of the screen device 2 on and in a radial Direction is followed by a wedge 24, which for example, as shown in Figure 6, with a complementary designed wedge surface of a corresponding wedge-shaped opening 15 "in the spacer element 3 the screening device 2 can work together. As a suit element is similar to that described above Embodiments provided a screw 25. The shaft the screw 25 is through a corresponding opening in the Reinforcement device 4 performed with play and after Production of the frictional clamp connection of Screening device 2 and reinforcing device 4 can then the tightening element in the form of a screw 25, for example firmly attached to the reinforcement device 4 become.

In Figure 7 is a two-part embodiment Clamping connection of screen device 2 and reinforcement device 4 shown. The two-part clamping element 26 comprises a cover strip-shaped first part 27, which bears against the screen surface 9 of the screen device 2. This first part 27 has, as shown, a thread for Receiving a screw 28 serving as a tightening element. Between the inside of the reinforcement device 4 and the assigned inside of the cover strip-shaped first Part 27 is an expansion bar 29 with a through hole arranged. When tightening the screw 28 Spreading strip 29 in cooperation with the cover strip-shaped first part 27 spread and the screening device 2 with the spacers 3 is frictionally by means of Clamp connection connected to the reinforcement device 4.

In the embodiment of Figure 9, a clamping element 30 used, which is I-shaped in cross section is. One cross leg 31 lies against the screen surface 9 the screening device 2. The other cross leg 32 of the Cross-section I-shaped clamping element 30 lies against that corresponding spacer 3. This is preferably I-shaped clamping element 30 in the form of a bar, which is in the axial direction of the screening device 1 or extends at an angle to this. Such in the form a bar formed and I-shaped in cross section Clamping element 30 is expediently of an axial Introduced side of the screening device 1 ago and the screening device 2 will cooperate in the circumferential direction spread with the clamping element 30 and so frictionally connected to the reinforcement device 4 with a clamp connection.

An embodiment variant of a explained in total with 40 designated sieving device. As in the previously discussed embodiments the screening device 40 according to FIG. 10 is a screening device 42, spacer elements 43 and a reinforcing device 44. On at least one axial end face of the screening device 40 is a terminating element 45 which, for example ring-shaped in the manner of an end ring is releasably connected to the reinforcing device 44. Pins 46 are used for the releasable connection according to FIG used, which in the circumferential direction of the closure element 45 are preferably arranged regularly distributed. Further is the end element 45 with respect to the screening device 42 facing surface formed such that the end element 45 at the same time an axial positioning of the screening device 42 allowed. In deviation from the embodiment according to Figure 1 can therefore the insert tape shown there 12 omitted without replacement. At the same time, the Disassembly of the screening device 40 to replace the screening device 42. For this purpose, the one formed by the pins 46 Detachable connection of end element 45 and reinforcement device 44 solved and then the screening device 42 together with the spacer elements 43 or taken in uniform circumferential sections.

FIG. 11 shows a further embodiment variant of an overall with 40 'designated sieve. In deviation from the screening device 40 according to FIG. 10-ist there a releasable connection of the end element 45 'and Reinforcement device 44 'shown, which of axially extending Screws 47 is formed. These screws too 47 are preferably at regular angular intervals Closing element 45 'arranged and engage accordingly assigned threaded openings in part of the reinforcement device 44 'a. This end element 45 ' is designed so that by appropriate interpretations the sieve device 42 can thereby be positioned axially can.

Although not shown in more detail, others can front end elements 45, 45 'releasably with the reinforcing device 44, 44 'are connected. Naturally are also combinations of detachable and fixed connection of end element 45, 45 'and reinforcing device 44, 44 'possible, and it is sufficient if at least one of the End elements 45, 45 'on the end face with the reinforcing device 44, 44 'is detachably connected.

The frictional clamp connections of the screening device 42 with spacer 43 and the associated Reinforcement means 44, 44 'can be as in the foregoing Embodiments explained designed accordingly become.

Figure 12 shows an alternative embodiment of a frictional clamp connection for a screening device, which is labeled with a total of 50 there. at this embodiment is a wedge seat clamp connection realized. The screening device 50 includes like that a screening device explained above 52, spacer elements 53, a reinforcing device 54 and a preferably detachable with the reinforcing device 54 connected end element 55. In this The sieve device 52 of the sieve device is an embodiment 50 designed in the form of a sieve insert, wherein for example the spacer elements 53 of the screening device 52 form a conical seat surface 56 in the axial direction.

The reinforcing device 54 has a complementary one for this conical seat surface course 57 in such a way that when inserting the sieve device designed as a sieve insert 52 over the conical seats 56, 57 a frictional clamp connection with the reinforcing device 54 is made such that the screening device 52 by means of the frictional clamp connection over the conical seats 56, 57 in the form of a Cone seating effect is determined. This will then Screening device 52 on the clamp connection on the Reinforcement device 54 set so that the sieve device 52 is not relative to the reinforcement device 54 can twist when ready for use. How shown schematically, the end member 55 may be similar as shown in Figure 11, expediently detachable with of the reinforcing device 54.

In Figure 13 is another application example of an overall shown with 60 designated screening device. In Deviation from the embodiment of Figure 1 form the rod-shaped sieve elements 66 spiral sieve slots 67. In the same or a similar way as before Such a screening device 62 can also be described the sieving device 60 by means of a frictional clamp connection with the. Reinforcement device 64 connected become. The correspondingly explained above Embodiments of the clamp connections and the like, can in the same or a similar way at a such a screening device 60, if necessary, with corresponding ones Variations are used.

Although in the variants described above the screening devices 2, 42, 52 and 62 as Slotted screen mats and / or sections thereof are shown are which rod-shaped sieve elements or sieve rods 6 or 66, the screening devices 2, 42, 52 or 62 also from a sieve plate, not shown and / or sections thereof are formed.

Of course, the invention is not based on the above explained details regarding the preferred Embodiments limited, but there are numerous Changes and modifications possible, the expert will meet if necessary, without the inventive concept to leave. For example, as in FIG reinforcement rings 48 on the outer periphery of the reinforcement means 4, 44, 44 ', 54 or 64 if necessary be provided. Furthermore, it is in the invention Screening device 1, 40, 40 ', 50 or 60 essential that the Screening device 2, 42, 52 or 62 in total as replaceable Unit is designed by the respective screening device 1, 40, 40 ', 50 or 60 releasably by means of a frictional Clamping connection with the respectively assigned Reinforcement device 4, 44, 44 ', 54 or 64 connected is.

LIST OF REFERENCE NUMBERS

1

Screening device overall in FIG. 1

2

Total screening device

3

spacers

4

reinforcing device

5

terminating element

6

Rod-shaped sieve element or sieve rods

7

screen slots

8th

Inner surface of the screening device 1

9

Screen area

10

welded joint

11

Wedge connection in Figure 1

11 '

Wedge connection in Figure 2

11 "

Wedge connection in Figure 3

12

inlaid band

14

Wedge element in Figure 2

14 ', 14 ", 14'", 14 "

each wedge elements

15

Wedge-shaped opening in Figure 2

15 "

Wedge-shaped opening in Figure 2

16

screw

17

step screw

19

bolt

20

welded joint

21

T-shaped clamping element in Figure 6

22

rail

23

transverse leg

24

tightening wedge

25

screw

26

Clamping element in figure 7

27

Cover part shaped first part

28

screw

29

Spreizleiste

30

Clamping element in Figure 9

31

transverse leg

32

transverse leg

40

Screening device in FIG. 10

42

screening

43

spacers

44

reinforcing device

44 '

Reinforcement device in FIG. 11

45

terminating element

45 '

Closing element in Figure 11

46

pencils

47

screw

48

reinforcement rings

50

Screening device overall in FIG. 12

52

screening

53

spacer

54

reinforcing device

55

terminating element

56

Conical seat of sieve 52

57

Conical seat on the reinforcement device 54

60

Screening device overall in FIG. 13

62

screening

64

reinforcing device

66

Rod-shaped sieve elements

67

screen slots

Claims (26)

1. Screen apparatus, in particular for fibrous suspensions in the paper industry, having an essentially cylindrical screen device (2; 42; 52; 62) forming a screen surface (9), and which is supported on a reinforcing device (4; 44; 44'; 54; 64) arranged to be spaced radially by means of spacer elements (3; 43; 53;), wherein the screen device (2; 42; 52; 62) as a unit can be exchanged and is fixed frictionally to the reinforcing device (4; 44; 44', 54; 64) and wherein the screen device (2; 42; 52; 62) and the reinforcing device (4; 44; 44'; 54; 64) are connected releasably by means of a frictionally engaged clip closure connection, characterised in that the clip closure connection fixes the screen device (52) to the reinforcing device (54) by means of an axial conical seat action.
2. Screen apparatus according to claim 1, characterised in that the screen device (2; 42; 52; 62) in cooperation with the spacer elements (3; 43; 53) is fixed to the reinforcing device (4; 44; 44'; 54; 64) by the clip closure connection.
3. Screen apparatus according to claim 1 or 2, characterised in that the clip closure connection comprises clip elements (14; 14'; 14"; 14"'; 21; 26; 30), which can be moved radially in the direction of the reinforcing device (4; 44; 44'; 54; 64) to form the clip closure connection.
4. Screen apparatus according to claim 3, characterised in that the clip element (30) is designed to be 1-shaped in cross-section, the one cross-limb (31) rests against the screen device (2) and the other (32) against the reinforcing device (3).
5. Screen apparatus according to claim 3, characterised in that the clip elements (14; 14'; 14"; 14"'; 21; 26) of the clip closure connection go through the screen device (2) and can be fixed to the reinforcing device (4).
6. Screen apparatus according to one of claims 3 to 5, characterised in that several clip elements (14; 14'; 14"; 14"'; 21; 26) are arranged on an axial line of the screen device (1; 40; 40'; 50; 60).
7. Screen apparatus according to claim 1, 2, 3 or 6, characterised in that the clip elements are designed as wedge elements (14; 14'; 14"; 14'") with radial taper direction to form the clip closure connection.
8. Screen apparatus according to claim 7, characterised in that the wedge taper connection is formed in cooperation of wedge element (14; 14', 14"; 14"') and reinforcing device (4; 44; 44'; 54; 64).
9. Screen apparatus according to claim 1, 2, 3 or 6, characterised in that the clip element (21) is designed to be T-shaped and the cross-limb (23) of the "T" rests on the screen surface (9) of the screen device (2).
10. Screen apparatus according to claim 9, characterised in that the T-shaped clip element (21) is designed in the form of a rail (22) running in axial direction of the screen apparatus (2) or at an angle thereto or spirally.
11. Screen apparatus according to claim 9 or 10, characterised in that the clip element (26) designed to be T-shaped is designed to have two parts.
12. Screen apparatus according to claim 11, characterised in that the clip element (26) designed to have two parts comprises a cross-limb part (27) resting on the screen surface (9) of the screen device (2) and a longitudinal limb part (29) passing through the spacer element (3).
13. Screen apparatus according to one of claims 3 to 12, characterised in that the clip elements (14; 14'; 14"; 14"'; 21; 26; 30) of the clip closure connection can be moved radially by means of at least one taper element in the form of a screw, rivet or bolt connection.
14. Screen apparatus according to claim 13, characterised in that each taper element can be fixed to the reinforcing device (4; 44; 44'; 54; 64) after producing the clip closure connection.
15. Screen apparatus according to claim 14, characterised in that the taper element at least partly passes through the reinforcing device (4; 44; 44'; 54; 64) in a radial direction.
16. Screen apparatus according to one of claims 13 to 15, characterised in that the taper element can be exposed to force from the outer side of the reinforcing device (4; 44; 44'; 54; 64) to form the clip closure connection.
17. Screen apparatus according to one of the preceding claims, characterised in that for axial fixing to at least one axial end face of the screen apparatus (2; 42; 52; 62), a closure element (5; 45; 45'; 55), is connected, preferably releasably, to the reinforcing device (4; 44; 44'; 54; 64), which positions the screen device (2; 42; 52; 62) in axial direction.
18. Screen apparatus according to claim 17, characterised in that the releasable connection is designed as a pin connection (46).
19. Screen apparatus according to claim 17, characterised in that the releasable connection is designed as a screw connection (47).
20. Screen apparatus according to one of the preceding claims, characterised in that the screen device (2; 42; 52; 62) is formed by a bar screen mat and/or sections of the same.
21. Screen apparatus according to one of claims I to 19, characterised in that the screen device (2; 42; 52; 62) is formed by a screen plate and/or sections of the same.
22. Screen apparatus according to claim 20 or 21, characterised in that the screen device (62) has spirally running screen slots (61) on the screen surface (9).
23. Screen apparatus according to one of the preceding claims, characterised in that the reinforcing device (4; 44; 44', 54; 64) is designed as a reinforcing shell provided with passages.
24. Screen apparatus according to one of the preceding claims having at least one closure element (5; 45; 45'; 55) on the axial end face of the screen apparatus (2; 42; 52; 62), characterised in that the closure element (5; 45; 45', 55) on the reinforcing device (4; 44; 44'; 54; 64) is to be accessible on both sides before arranging the screen device (2; 42; 52; 62) with the spacer element (3; 43; 53).
25. Screen apparatus according to claim 24, characterised in that the screen device (2, 62) with spacer elements (3) is positioned in axial direction with respect to the end-face closure element (5) by interposition of an insertion band (12).
26. Screen apparatus according to one of the preceding claims, characterised in that a pinned fitting transferring shearing force is additionally provided to avoid relative displacement on the periphery of screen device (2; 42; 52; 62) with spacer elements (3; 43; 53) and reinforcing device (4; 44; 44'; 54, 64).

Images