EP4260953A1 - Screening device - Google Patents

Abstract

Sieving device for sieving bulk materials comprising: - a housing (3) having two side parts (2), - at least one cross strut (4) connecting the two side parts (2), which is designed to accommodate a sieve covering (5) and - at least one the at least one cross strut (4) carrying the screen covering (5) and connecting the clamping device (7) to the side parts (2), the at least one clamping device (7) being arranged on an inside on one of the two side parts (2), which inside is the each other side part (2) facing at least two side parts (2).

Description

The present invention relates to a screening device for screening bulk material according to the preamble of claim 1.

Appropriate screening machines, in particular vibrating screening machines or vibrating screening machines, are used for classifying, screening and dewatering bulk materials and the like.

• ein zwei Seitenteile aufweisendes Gehäuse,
• wenigstens eine die zwei Seitenteile verbindende Querstrebe, welche dazu ausgebildet ist, einen Siebbelag aufzunehmen und
• wenigstens eine die wenigstens eine den Siebbelag tragende Querstrebe mit den Seitenteilen verbindende Klemmvorrichtung.

Generic sieving devices for sieving bulk materials include:

• a housing with two side parts,
• at least one cross strut connecting the two side parts, which is designed to accommodate a screen covering and
• at least one clamping device connecting the at least one cross strut carrying the screen covering to the side parts.

It is known from the prior art to arrange screen coverings via cross struts on a housing of a vibrating screening machine, with the cross struts (usually via longitudinal struts arranged on the cross struts) holding a screen covering.

The cross struts were previously equipped with welded flange points, which were used to hold the screws for screwing the cross struts to the side walls.

However, over time it became apparent that the welds and weld seams on the crossbars represented weak points in the crossbars, which often failed due to the high vibration loads and compressive forces of the material being screened.

This resulted in a common embodiment variant in the prior art, in which the cross struts were arranged between the two side walls in such a way that they protruded through the side walls on both sides and were clamped and screwed to the side walls of the housing on an outside of the side walls via connecting elements, as it is, for example, from the WO 2020/200943 A1 or the US 2002/0195377 A1 emerges.

However, the disadvantage of these known design variants was that the cross struts can only be dismantled and assembled with a very high amount of work, since all components attached to the cross strut (longitudinal struts and screen covering) must first be dismantled, then the holder on the side walls must be loosened before the cross struts can be removed from the housing through the side walls.

Of course, a corresponding procedure applies vice versa for the assembly of cross struts.

However, especially during maintenance work, there are often only limited surrounding spaces available and/or it is important to carry out maintenance work as quickly as possible in order not to interrupt the use of the screening device for an unnecessarily long time to have to, the desire developed from the prior art for a screening device which requires less maintenance and/or enables better disassembly or assembly of the individual parts.

The object of the present invention is to at least partially improve the aforementioned disadvantages of the prior art and/or to create a possibility with which a more compact variant of the connection between cross struts and side walls can be implemented and/or a connection variant can be implemented, which allows better assembly and/or disassembly and/or which can withstand higher loads.

This object is achieved by a screening device for screening bulk material according to the features of claim 1.

• ein zwei Seitenteile aufweisendes Gehäuse,
• wenigstens eine die zwei Seitenteile verbindende Querstrebe, welche dazu ausgebildet ist, einen Siebbelag aufzunehmen und
• wenigstens eine die wenigstens eine den Siebträger tragende Querstrebe mit den Seitenteilen verbindende Klemmvorrichtung,

wobei die wenigstens eine Klemmvorrichtung an einer Innenseite an einer der zwei Seitenteile angeordnet ist, welche Innenseite dem jeweils anderen Seitenteil der wenigstens zwei Seitenteile zugewandt ist.According to the invention it is provided that the screening device comprises the following:

• a housing with two side parts,
• at least one cross strut connecting the two side parts, which is designed to accommodate a screen covering and
• at least one clamping device connecting the at least one cross strut carrying the portafilter to the side parts,

wherein the at least one clamping device is arranged on an inside on one of the two side parts, which inside faces the other side part of the at least two side parts.

Thus, it is provided according to the invention that the at least one clamping device can be used to arrange the at least one cross strut carrying the portafilter on an inside of the at least two side parts, whereby on the one hand the cross strut can be arranged in a space-saving manner inside the sieve device - more precisely: the housing - and on the other hand Accessibility - to be precise: ease of assembly and dismantling - is significantly increased.

This means that it is no longer necessary to thread the cross struts out or through the side walls in a complex manner during assembly or disassembly, but rather the cross strut can be released using the clamping device and simply removed via the inside of the side walls.

The possibility is also created for individual cross struts to be dismantled or assembled without having to remove the screen covering or any existing longitudinal beams, whereby the screen covering and / or the longitudinal beams can be held by the remaining cross beams and an individual cross strut by loosening the clamping device can be dismantled or assembled by jamming the clamping device.

Especially in spatially limited applications, this has the significant advantage that the at least one cross strut can be dismantled on the same floor plan of the screening device and does not have to be removed or fed laterally through the side parts, which not only significantly reduces the assembly or disassembly effort, rather The requirements for the environment during assembly or disassembly can also be reduced.

It can also be provided that a device according to the invention is used in known embodiment variants of the prior art - as described, for example, in the introduction to the description - and / or is subsequently installed in corresponding configurations.

Advantageous embodiments of the invention are defined based on the dependent claims.

Preferably, it can be provided that the at least one cross strut has a longitudinal extent between the two side parts, which longitudinal extent of the at least one cross strut is less than or equal to a distance between the two side parts along the longitudinal extent.

A design of the cross strut smaller than the distance between the two side parts results in a particularly favorable dimensioning of the cross struts for assembly and / or disassembly between the two side walls, whereby the cross strut can be comfortably and easily removed between the two side walls via the clamping device or loosening the clamping device can be supplied.

It can be provided that the at least one clamping device is connected to the side parts by at least one releasable fastening means, preferably a screw connection.

By releasably attaching the at least one clamping device to the inside of the side wall of the device by means of at least one releasable fastening means, a particularly favorable possibility is created for dismantling or assembling the at least one cross strut on the inside of the side wall, with the entire disassembly or assembly being carried out in the area can be made on the inside of the device. On the one hand, this enables space-saving and, on the other hand, simple disassembly or assembly of the at least one cross strut.

It can be provided that there is at least one screen lining support connected to the at least one cross strut, which is designed to accommodate a screen lining.

It is preferably provided that at least one fastening device for fastening at least one longitudinal strut is provided on the at least one cross strut, the screen covering being able to be arranged on the at least one longitudinal strut.

The at least one fastening device can take place, for example, via a clamping device, a screw connection and/or a welded connection.

It can be provided that the clamping device has an opening corresponding to the external dimensions of the at least one cross strut cooperating with the clamping device, preferably a hole for receiving at least one cross strut.

For example, it can be provided that the opening of the at least one clamping device is designed to be larger by a defined factor than the outer dimension of the cross strut cooperating with the at least one clamping device. Such a defined magnification factor can be given, for example, by a corresponding fit tolerance.

Preferably, it can be provided that the at least one clamping device has a component which encloses the at least one cross strut to at least 60% - preferably 75% - with a clamping cross section, the clamping cross section of the enclosing component being formed by at least one clamping element in its size, preferably in one Diameter can be changed by clamping the at least one cross strut.

It can therefore be provided that the contact-enclosing component encloses the at least one cross strut to a large extent - more precisely: at least 60% -, whereby the clamping force is then built up to a high extent - more precisely: by as much as possible large area of the circumference - to which at least one cross strut can be transferred, whereby the clamping effect can be significantly increased by increasing the clamping surface while maintaining the same clamping force.

A significant technical effect of this design is that the at least one clamping element itself, especially when using screw connections, has less dynamic loads in the longitudinal direction. This effectively counteracts the independent loosening of the at least one clamping element.

Particularly preferably, it can be provided that the contact-enclosing component surrounds up to 95%, preferably up to 99%, of at least one cross strut viewed in the clamping cross section.

This creates the possibility that, in appropriate configurations, clamping forces are not only introduced on one side into the at least one cross strut, which leads to a particularly favorable force distribution, which leads to minimal force variations of the clamping element in the event of vibrations, shocks or large force influences due to the weight of the material to be screened .

As mentioned, these minimal force variations have a particular advantage in that, for example, when using screw elements, the settlement and/or the acting forces that lead to the loosening of the screw can be minimized and/or in some cases even completely eliminated.

It can be provided that the enclosing component is designed as a slotted component, with a slot being provided which opens the clamping cross section to an environment.

By designing the enclosing component as a slotted component, a clamping force can be implemented in a simple manner by using the clamping element in the slotted area by building up a compressive force in the area of the slot, which leads to a reduction in the clamping cross section or a direct force transmission or Clamping force on which at least one cross brace results.

It can be provided that the at least one clamping element is designed as a screw, preferably whereby the clamping element designed as a screw means that the clamping device is clamped to the at least one cross strut by screwing the screw with a screw nut.

Alternatively or additionally, it can also be provided that the clamping element is formed by other machine elements known from the prior art, such as locking ring bolts.

For easy assembly and disassembly, it can be provided that the screw head is arranged on a side facing the screen covering, so that the screw shoulder of the screw is freely accessible for assembly or disassembly of the screw nut.

Preferably, it can be provided that the clamping device is at least partially plastically and/or elastically deformable when clamping the at least one cross strut by means of the at least one clamping element.

It can be provided that the clamping device can be connected to the at least one cross strut with its clamping cross section along an axial clamping length, which clamping length is in a ratio of 0.3 to 0.7, preferably 0.4 to 0.6, to one diameter of the clamping cross section.

Preferably, it can be provided that the at least one cross strut cooperating with the at least one clamping device is designed with a round, preferably circular, cross section.

It can be provided that the clamping device is made of a steel material, preferably a structural steel.

Fig. 1

eine Ausführungsvariante einer Siebvorrichtung,

Fig. 2

eine weitere Ansicht des Ausführungsbeispiels aus Fig. 1, und

Fig. 3a-3d

Detailansichten der Klemmvorrichtung aus den Ausführungsbeispielen der Figuren 1 und 2.

Further details and advantages of the present invention are explained in more detail below using the description of the figures with reference to the exemplary embodiments shown in the figures. This shows:

Fig. 1

an embodiment variant of a screening device,

Fig. 2

another view of the exemplary embodiment Fig. 1 , and

Figs. 3a-3d

Detailed views of the clamping device from the exemplary embodiments of Figures 1 and 2 .

Fig. 1 shows a first exemplary embodiment of a screening device 1.

The screening device 1 has a housing 3 which has two side parts 2. Between the side parts 2 are Sieve coverings 5 are arranged, which are connected to the housing 3 - more precisely: the side parts 2 - via the cross struts 4 and the longitudinal struts 6.

The screen coverings 5, together with the cross struts 4 and the longitudinal struts 6, form the so-called screen deck, with two screen decks arranged one above the other being arranged in this exemplary embodiment of the screening device 1.

During operation, a bulk material to be sieved is now placed on the top sieve deck, with the sieve coverings 5 being equipped with a mesh size that decreases towards the bottom, so that different degrees of grain size can be separated from top to bottom by the sieving device 1 and thus classified.

Fig. 2 shows a view of the exemplary embodiment of the screening device 1 Fig. 1 , whereby it can be seen in better detail how the cross strut 4 is attached to the side parts 2 via the clamping devices 7.

The cross struts 4 of this exemplary embodiment are as through Fig. 2 can be seen via the clamping devices 7 on an inside (which inside faces the other side part 2 of the two side parts 2) of the side walls 2 attached.

The clamping device 7 is screwed to the side walls via the inside of the side walls 2 via screw connections that serve as releasable fasteners.

Alternatively or additionally, the screw connections of the clamping device 7 to the side wall 2 can also be carried out by connections with locking ring bolts and/or rivet connections.

The clamping devices 7 are provided on the cross struts 4 and are clamped to the cross struts 4. The longitudinal struts 6 are connected to the cross struts 4 via the fastening devices 14, with the screen coverings 5 being arranged on the longitudinal struts 6.

The cross struts 4 are connected to the side walls 2 via the clamping devices 7 by means of screw connections (the screw connections are not shown in this view for reasons of clarity, but can be recognized through the holes) and can be connected via this screw connection and the holes arranged in a grid the side walls 2 (see also Fig. 1 ) can be varied in their position.

The example shown of the sieve device 1 is designed as an exemplary embodiment with transversely tensioned sieve coverings 5, the sieve coverings 5 being clamped along the side walls 2 on the side walls 2. Alternatively, a longitudinally stretched screen covering would also be possible.

The Figures 3a to 3d show the attachment of a cross strut 4 via the clamping device 7 to the side walls 2 in different views.

It can now be seen how the clamping device 7 is provided as an enclosing component 8 on the cross strut 4 is, which almost completely encloses the cross strut 4 with a clamping cross section. This enclosing component 8 has a slot 11, which exposes the opening 10, in which the cross strut 4 is arranged, to the environment.

By screwing, the slot 11 can be subjected to a compressive force, whereby the clamping force is generated between the clamping device 7 and the cross strut 4.

The cross strut 4 is also connected to the side parts 2 via a screw connection via the component 8.

The clamping device 7 is in the Fig. 3c shown in more detail in a sectional view in an assembly, with reference being made below to this figure for more detailed explanation.

It can thus be seen that the enclosing component 8 has an opening 10, which opening 10 is designed to receive the cross strut 4.

The opening 10 has a diameter 16, with the cross strut 4 having a diameter of 16 along the longitudinal axis of the cross strut 4 over a clamping length 15 (see Fig. 3b or 3d ) is clamped.

The enclosing component 8 is equipped on one side with a slot 11, which slot 11 exposes the opening 10 to the environment.

Via the clamping element 9 (in this exemplary embodiment designed as a screw 12 with a screw nut 13), the clamping device can be clamped relative to the cross strut 4 by exerting a compressive force on the slotted part of the component 8, whereby the slot 11 partially closes and an elastic and / or plastic deformation of the component 8 is carried out.

This compressive force and reduction of the slot 11 reduces the diameter 16, whereby this diameter 16 rests on the outer diameter of the cross strut 4 until a compressive force is exerted over (almost) the entire circumference of the cross strut 4.

Apart from the small area of the slot 11, an almost uniform distribution of the clamping force is thus implemented over the entire circumference of the cross strut 4.

The screw 12 provided as a clamping element 9 cooperates with a screw nut 13. Furthermore, the component 8 has holes through which the component 8 can be connected to the side walls 2 via a screw connection.

It can also be seen that the enclosing component 8 has four holes in this exemplary embodiment, via which the enclosing component 8 can be fastened to one of the side parts 2 (for example via screws, locking ring bolts or the like).

When assembling or dismantling the sieve device - more precisely: the cross struts 4 of the one shown Embodiment - there is now the striking advantage that the cross struts 4 can be released via the clamping devices 7.

So the clamping devices 7 can first be released from the side walls 2 via the screw connections (or, if rivet connections and/or connections with locking ring bolts are provided, by cutting open the bolt elements).

The cross struts 4 can then be detached from the longitudinal beams 6 via the fastening devices 14, whereby the cross struts 4 can be removed downwards (seen from the screen coverings 5) without having to loosen the longitudinal struts 6, the screen coverings 5 or the remaining cross struts 4 .

Due to the removal downwards (seen from the sieve coverings 5), a very small space requirement is also provided for the assembly or disassembly of the cross struts 4, which creates another major advantage with regard to the prior art.

List of reference symbols:

1

Sieving device

2

Side parts

3

Housing

4

Cross brace

5

Sieve covering

6

Longitudinal strut

7

Clamping device

8th

enclosing component

9

Clamping element

10

opening

11

slot

12

screw

13

screw nut

14

Fastening device

15

Clamp length

16

diameter

Claims (12)

Sieving device for sieving bulk materials comprising: - a housing (3) having two side parts (2), - at least one cross strut (4) connecting the two side parts (2), which is designed to accommodate a screen covering (5) and - at least one clamping device (7) connecting the at least one cross strut (4) carrying the screen covering (5) to the side parts (2), characterized in that the at least one clamping device (7) is arranged on an inside on one of the two side parts (2), which inside faces the other side part (2) of the at least two side parts (2). Sieving device according to claim 1, wherein the at least one cross strut (4) has a longitudinal extent between the two side parts (2), which longitudinal extent of the at least one cross strut (4) is less than or equal to a distance between the two side parts (2) along the longitudinal extent. Portafilter according to one of the preceding claims, wherein the at least one clamping device (7) is connected to the side parts (2) by at least one releasable fastening means, preferably a screw connection. Portafilter according to at least one of the preceding claims, wherein at least one fastening device (14) for fastening at least one longitudinal strut (6) on which at least one cross strut (4) is provided, the screen covering (5) being able to be arranged on the at least one longitudinal strut (6). Sieving device according to at least one of the preceding claims, wherein the clamping device (7) has an opening (10), preferably a bore, corresponding to the external dimensions of the at least one cross strut (4) cooperating with the clamping device (7), for receiving the at least one cross strut (4). having. Sieving device according to at least one of the preceding claims, wherein the at least one clamping device (7) has a component (8) which encloses the at least one cross strut (4) to at least 60% - preferably 75% - in contact with a clamping cross section, the clamping cross section of the enclosing Component (8) can be changed in size, preferably in diameter (16), by at least one clamping element (9) by clamping the at least one cross strut (4). Sieving device according to claim 6, wherein the enclosing component is designed as a slotted component (8), a slot (11) being provided which opens the clamping cross section to an environment. Sieving device according to one of claims 6 or 7, wherein the at least one clamping element (9) is designed as a screw (12), preferably with the as Screw (12) formed clamping element (9) by means of screwing the screw (12) with a screw nut (13) a clamping of the clamping device (7) is realized with the at least one cross strut (4). Sieving device according to at least one of claims 6 to 8, wherein the at least one clamping element (9) allows the clamping device (7) to be at least partially plastically and/or elastically deformed when clamping the at least one cross strut (4). Sieving device according to at least one of claims 6 to 9, wherein the clamping device (7) can be brought into connection with its clamping cross section along an axial clamping length (15) with the at least one cross strut (4), which clamping length (15) in a ratio of 0. 3 to 0.7, preferably from 0.4 to 0.6, to a diameter (16) of the clamping cross section. Screening device according to at least one of the preceding claims, wherein the at least one cross strut (4) cooperating with the at least one clamping device (7) is designed with a round, preferably circular, cross section. Screening device according to at least one of the preceding claims, wherein the clamping device (7) is made of a steel material, preferably a structural steel.

Images