CN104056774A - Screening machine with connecting rod covering devices - Google Patents

Abstract

The invention relates to a screening machine comprising a screen box which can be vibrated by means of a driving device and which has side walls of the screen box, and further comprising a vibrating frame elastically coupled to the screen box, the vibrating The frame includes connecting rods elastically coupled with the side walls of each screen box and vibrating frame beams connecting the connecting rods, and the screening machine includes a screen surface formed by screens, wherein the screens are alternately fixed on the screen The boxes, preferably the screen box beams connecting the screen box side walls and the vibrating frame, preferably the vibrating frame beams, are alternately roughened or stretched at least in sections. In order to suppress the occurrence of flying particles or dust in the region of the connecting rods, it is provided according to the invention that a connecting rod covering device is provided which has a U-shape in a direction perpendicular to the longitudinal length of the corresponding connecting rod and the connecting rod covering device is sealingly connected to the side wall of the screen box, and the connecting rod covering device sealingly surrounds the corresponding connecting rod outwardly with respect to the working position.

Description

Screening machine with connecting rod covering device

technical field

The invention relates to a screening machine comprising a screening box which can be vibrated by means of a drive and which has side walls of the screening box, which is supported elastically, preferably via springs, on a fixed base in the operating position of the screening machine In addition, the screening machine also includes a vibrating frame elastically coupled with the screen box, the vibrating frame includes connecting rods elastically coupled with the side walls of each screen box and vibrating frame beams connecting the connecting rods, and The screening machine comprises a screen surface formed by screens, wherein the screens are alternately fixed to the screen boxes, preferably to the screen box beams for connecting the side walls of the screen boxes, and to the vibrating frames, preferably the vibrating frame beams At least the segments are alternately roughened or stretched, wherein the edge regions of the screen which run transversely to the vibrating frame beams are pulled upwards.

Background technique

A screening machine is known from AT 393 636 B, which comprises a screen box with screening sides and a screen surface formed by a screen, wherein the edge regions of the screen are raised and not perforated. This geometry of the screen achieves a seal of the screen or screen surface against the side walls of the screen box and should prevent coarse particles from entering the lower section of the screening machine

The screens are alternately connected to the screen box and a vibrating frame including connecting rods elastically connected to the side walls of the screen box, and the screens are alternately coarsened at least in sections when the screening machine is in operation and stretch. Here, the screen is fixed on the vibrating frame of the vibrating frame crossbeam connected with the connecting rod, wherein a through hole is provided in the side wall of the screen box for connecting the vibrating frame crossbeam and the connecting rod. Sealing the through holes along the connecting rod against the escape of flying particles and dust cannot be achieved by the solution disclosed in AT393636B. When sieving dry products, this geometry of the passing screen also avoids equally little dust formation, which escapes from the inside of the machine to the outside and is extremely damaging to the environment.

Contents of the invention

The present invention seeks to provide a screening machine which avoids the above-mentioned disadvantages. In particular, it is necessary to ensure that the connecting rod along the vibrating frame in the through hole area of the side wall of the screen box effectively prevents the selection of splashed particles and dust. In addition, dust-forming and environmentally damaging dust can generally be prevented from escaping while the sifter is in operation.

The starting point is a sifting machine comprising a sieve box which can be vibrated by means of a drive and which has sieve box side walls which are supported elastically, preferably via springs, in the operating position of the sieving machine On a fixed base, in addition, the screening machine also includes a vibrating frame elastically coupled with the screen box, the vibrating frame includes connecting rods elastically coupled with the side wall of the screen box and a vibrating frame connected with the connecting rods beam, and the screening machine includes a screen surface formed by a screen, wherein the screen passes through alternately fixed on the screen box, preferably used to connect the screen box sidewalls of the screen box beams and vibrating frames, preferably vibrating frame beams , at least in sections, are alternately roughened or stretched, and the edge regions of the sieve that extend transversely to the direction of the vibrating frame beams are pulled upwards and are preferably free of perforations. In order to prevent flying particles and/or dust from escaping in the region of the connecting rod or along the connecting rod and possibly affecting the environment, according to the invention a connecting rod cover is provided for at least one connecting rod. Furthermore, according to the invention it is proposed that the connecting rod covering device has a U-shaped cross-section in a direction perpendicular to the longitudinal length of the corresponding connecting rod, and that the connecting rod covering device is connected sealingly to the side wall of the screen box, and that the connecting rod covering device With respect to the operating position, the corresponding connecting rod is sealed outwards, that is to say, the connecting rod covering device seals surrounding the corresponding connecting rod upwards or downwards in the operating position and looking forward or backwards in the direction of the longitudinal length of the connecting rod. .

The sealing connection is realized in a known manner, for example by the connecting rod cover having a preferably continuous sealing lip made of rubber, via which the connecting rod covering is connected to the side wall of the screen box. In order to ensure that the connecting rod covering device is at the front and rear with respect to the operating position, that is to say also surrounds the corresponding connecting rod in front of or behind the connecting rod when viewed in the direction of the longitudinal length of the connecting rod, the connecting rod covering device is at a distance from the longitudinal length of the connecting rod. The cross-section in a plane parallel to and parallel to the vibrating frame beams can also be U-shaped. Correspondingly, the connecting rods can also be protected against flying particles and/or dust and/or contamination from the outside in the working position.

In a preferred embodiment variant, the elastic connection of the connecting rod to the side wall of the screen box takes place by means of rubber buffers. Correspondingly, in a preferred embodiment variant of the screening machine according to the invention it is provided that the connecting rod covering device also surrounds the rubber buffer assigned to the corresponding connecting rod in a sealing manner, preventing coupling of the rubber buffer or the connecting rod. The joint or support is contaminated. Correspondingly, the connecting rod and its elastic coupling or bearing on the side wall of the screen box can also be protected against splashing particles such as/or dust and/or dirt from the outside in the working position.

In order to be able to monitor the deflection or movement of the connecting rod and its perfect functionality, it is provided in a preferred embodiment variant of the screening machine according to the invention that the connecting rod cover has at least one viewing window. Preferably, the viewing window enables viewing of the connecting rod in the region of the elastic connection or shaft coupling of the connecting rod to the side wall of the screen box, preferably in the region of the rubber buffer.

Each screen box side wall has a through hole in order to realize the connection between the vibrating frame beam and the corresponding connecting rod. That is to say, the vibrating frame beam is connected with the corresponding connecting rod through the through hole. Wherein, the vibrating frame beam is not directly connected with the connecting rod, but is connected with the fixing element fixed on the connecting rod, wherein the side wall of the screen box is arranged between the fixing element and the connecting rod.

Correspondingly, in a particularly preferred embodiment of the screening machine according to the invention it is provided that fastening elements are arranged on the vibrating frame, preferably on the connecting rod, which are used to fasten the vibrating frame crossbeam to the vibrating frame superior.

In order to prevent the splash particles from entering the through-hole or passing through the through-hole to the connecting rod or even into the area of the elastic connection between the connecting rod and the side wall of the screen box from the screen surface if necessary, in one part of the screening machine according to the invention In a particularly preferred embodiment, it is set: at least one sealing plate is arranged on an inner side of the side wall of the screen box, and the sealing plate surrounds the through hole of the side wall of the screen box, wherein, along the longitudinal length parallel to the vibrating frame beam Viewing from the direction, a vibrating frame beam is correspondingly arranged in the through hole. Here, the arrangement of the sealing plate on the inner side of the side wall of the screen box can be understood to mean that there may be a certain distance between the sealing plate and the inner side.

Furthermore, the corresponding sealing plate is arranged between the corresponding fastening element and the side wall of the screen box and forms a labyrinth-like seal to the outside, wherein the remaining inner clear bore of the corresponding through-opening is minimized. The risk of flying particles passing through the through openings is thereby minimized. In this case, the respective sealing plate is connected to the vibrating frame, preferably to the fastening element.

Accordingly, in a particularly preferred embodiment of the screening machine according to the invention it is provided that each sealing plate forms a labyrinth-like seal of the corresponding through-opening in a fixed manner against the screen box side wall and is connected to the vibrating frame.

Since it cannot be ruled out that flying particles and dust can enter the region of the connecting rod cover despite the sealing plate, in a particularly preferred embodiment of the screening machine according to the invention it is proposed that flying particles and dust flow back into the interior of the screening machine or into the screen. box scheme. Accordingly, in a particularly preferred embodiment of the screening machine according to the invention it is provided that, in the operating position, a material return opening is arranged in the corresponding screen box side wall in the region of the lowest point of the corresponding connecting rod cover , possible splash particles and dust can flow back into the screen box through the material return opening.

In order to prevent flying particles and dust from the screen surface from escaping from the screen box in the operating position, it is provided in a particularly preferred embodiment of the screening machine according to the invention that a flexible cover is provided, which The plates seal the screen box tightly above the screen deck in the operating position. When the screen box vibrates or moves relative to the fixed base, the flexible cover plate vibrates or moves with the screen box.

In order to achieve a particularly stable fixation of the flexible cover, it is provided in a particularly preferred embodiment of the screening machine according to the invention that the flexible cover is connected to the side walls of the screen box and to the intermediate support, wherein the intermediate support is parallel The longitudinal extension of the screen box is arranged between the side walls of the screen box, preferably centrally with respect to the screen surface, and the intermediate support is preferably supported on at least one cover beam. Preferably, the at least one cover beam is connected to the side walls of each screen box.

In order to be able to suck out the dust generated during sieving by means of an exhaust pipe, it is provided in a particularly preferred embodiment of the sieving machine according to the invention that at least one suction connection is provided, which is operated The location is arranged above a hole in the flexible cover and is connected in a sealing manner to the flexible cover, wherein at least one exhaust pipe can be connected to the at least one suction connection.

In order to also take into account movements or vibrations of the screen box and to ensure trouble-free suction, it is provided in a particularly preferred embodiment of the screening machine according to the invention that at least one elastic connection is provided. , for connecting the at least one exhaust pipe to the at least one suction pipe joint. Movements of the flexible cover or screen box relative to the exhaust pipe are compensated in this way.

In order to prevent the splashing material and dust from falling outside when the screening material is conveyed to the screen surface at the working position, a feeding sealing frame is provided. The material feeding sealing frame surrounds the edge of the feeding port, through which the screening material can be conveyed to the screen surface. On the one hand, the feed material sealing frame is hermetically closed by a first end face of the screen box, the side walls of the screen box and the flexible cover. On the other hand, the feed material sealing frame is designed in such a way that the feed pipe, which guides the screening material, can be connected to the feed material sealing frame in a known manner in a sealed manner. Therefore, in a particularly preferred embodiment of the sieving machine according to the invention, it is provided that there is a feed seal frame surrounding the closed feed opening, through which the feed opening can face the screen from the outside in the working position. The screened material is conveyed on the surface, the feed seal frame is set above the screen surface in the working position and the feed seal frame is sealingly connected with a first end surface of the screen box, and the side wall of the screen box is sealedly connected with the flexible cover plate.

In the working position, the feed sealing frame can be arranged, for example, in such a way that it is not arranged above the screen surface, nor is it partially above the screen surface, as seen in the normal direction. In this case, the screening material does not fall directly onto the screen surface through the feed opening, but reaches the screen surface indirectly, for example via the inner side of a first end face designed as a slideway. However, in a particularly preferred embodiment of the screening machine according to the invention, a design of the feed sealing frame is provided in which the screened material reaches the screen surface directly through the feed opening. Accordingly, it is provided in a particularly preferred embodiment of the screening machine according to the invention that, viewed in the direction of conveyance, the screen surface has a start and an end behind the start, and the feed opening is at least Locally set between the beginning and end of the screen surface, where the normal direction is perpendicular to the vibrating frame plane where the vibrating frame crossbeam is located, and points from the vibrating frame crossbeam to the screen, that is to say, from bottom to bottom in the working position superior.

In order to prevent the splashing material and dust from falling outside when the material is discharged at the end of the screen surface at the working position, a discharge sealing frame is provided. The discharge sealing frame surrounds the discharge opening through which the sieved material can be transported outwards from the end of the screen surface in the working position. On the one hand, the discharge sealing frame is hermetically closed by a second end face of the screen box and the side walls of the screen box. On the other hand, the discharge sealing frame is designed in such a way that a discharge pipe, which receives the screened material, can be connected to the discharge sealing frame in a known manner in a sealed manner. Accordingly, it is provided in a particularly preferred embodiment of the screening machine according to the invention that a discharge seal frame surrounding the discharge opening is provided, wherein the material to be screened through the discharge opening can be removed from the The end of the screen surface is conveyed outwards, the discharge sealing frame is arranged at least partially below the screen surface in the working position, and the discharge sealing frame is closed sealingly by a second end face of the screen box and the side wall of the screen box, wherein along Viewed in the conveying direction, the second end surface is located downstream of the first end surface.

In order to transport the sieve material at the end of the screen surface by gravity in the working position through the discharge opening, it is provided in a particularly preferred embodiment of the screening machine according to the invention that the discharge opening is at least partially arranged as seen in the conveying direction downstream of the end of the screen surface.

In order to prevent the splash particles and dust from escaping when the under-screen particles are discharged at the working position (the under-screen particles refer to the sieved materials passing through the mesh of the screen from the upper section to the lower section), a lower section seal is provided. frame. The lower section sealing frame surrounds the undersize particle discharge opening, wherein the undersize particle can be conveyed to the outside in the working position through the undersize particle discharge opening. The lower section sealing frame is arranged under the screen box in the operating position and is connected to the screen box in a sealing manner.

In addition, the lower section sealing frame is designed in such a way that the lower section discharge pipe, which receives the undersize particles, can be connected to the lower section sealing frame in a known manner in a leak-tight manner. Correspondingly, it is provided in a particularly preferred embodiment of the screening machine according to the invention that a lower section sealing frame is provided surrounding the undersize discharge opening, through which the undersize discharge opening is operated The position can transport the under-screen particles to the outside, the lower section sealing frame is arranged under the screen box at the working position, and the lower section sealing frame is sealingly connected with the screen box.

In order to be able to convey the screening material onto the screen surface by gravity, the screen surface is inclined in the operating position at an angle or at an angle that decreases in the conveying direction relative to the horizontal, fixed base. Correspondingly, the connecting rod is also tilted in this way. Therefore, in a particularly preferred embodiment of the screening machine according to the invention it is provided that in the operating position the connecting rod extends obliquely at an angle or at an angle decreasing in the conveying direction relative to the fixed base in the conveying direction. .

In order to be able to selectively classify by a plurality of screen surfaces and at the same time to arrange only one unique vibration system on the screen box, it is provided in a particularly preferred embodiment of the screening machine according to the invention that at least one additional The additional screen surface formed by the screen, wherein the additional screen is also alternately fastened to the screen box, preferably the screen box beam and the vibrating frame, preferably the vibrating frame beam.

In particular, the use of a single vibration system on the screen box and a particularly compact construction is achieved by fastening screens of different screen sizes to one of the fastening elements. Accordingly, in a particularly preferred embodiment of the screening machine according to the invention it is provided that a plurality of vibrating frame beams are fastened on one of the fastening elements, on which screens of different screen surfaces are fastened on the beam.

In order to achieve a particularly compact construction, it is provided in a particularly preferred embodiment of the screening machine according to the invention that the screening surfaces run parallel to one another.

Description of drawings

The invention will now be explained in more detail with the aid of a practical example. The drawings are exemplary and embody the idea of the invention, but in no way limit or even reflect it definitively.

Figure 1 shows an axonometric view of a screening machine according to the invention;

Figure 2 shows a side view of a screening machine comprising two screen surfaces according to the invention;

Figure 3 shows a sectional view according to the section line A-A in Figure 2;

Figure 4 shows a sectional view according to the section line B-B in Figure 2;

Figure 5 shows a top view of the sealing plate in Figure 4;

Figure 6 shows a side view of another screening machine comprising two screen surfaces according to the present invention;

FIG. 7 shows a detailed view of the connecting rod cover in the region of the side walls of the screen box including the material return opening.

Detailed ways

In the isometric view of FIG. 1 , a screening machine according to the invention can be seen in an operating position, said screening machine comprising a screen box 10 with a screen box side wall 7 . The screen box 10 is supported by springs 13 on a fixed, preferably horizontal base 12 . Furthermore, the screening machine shown in FIG. 1 comprises a simple unbalanced drive 9 driven by an electric motor, which causes the screen box 10 to vibrate in a circular motion. As an option, the unbalanced drive 9 can also be formed as a double unbalanced drive (see FIG. 6 ) with unbalanced counterweights running in opposite directions, whereby a linear excitation is generated. As another modification, the unbalanced drive device 9 can also be formed as a double or triple unbalanced drive device, so that the screen box 10 vibrates in an elliptical shape.

A vibration system forming a vibrating frame is provided on the screen box 10, and the vibration system includes a connecting rod 15 supported on the screen box side wall 7 of the screen box 10 by a preferred elastic rubber buffer 14 and a connecting rod arranged on the connecting rod. The fixing element 8 can be seen in the sectional view in FIG. 3 (see section line A-A in FIG. 2 ). The fastening element 8 extends substantially perpendicularly to the longitudinal axis of the connecting rod 5 and parallel to the screen box side wall 7 . At least one vibrating frame beam 2 is fastened to each fastening element 8 . The vibrating frame beam 2 connects the opposite fixing elements 8 or connecting rods 5 .

The screen box side walls 7 are connected to each other via the screen box beam 1 and the cover beam 50 , see FIG. 4 .

The sieving machine of the embodiment of FIG. 1 has a sieve surface 6 (or a cover plate comprising the sieve surface 6 ), wherein the sieve surface 6 is formed by a sieve cloth 3 comprising sieving holes (see FIG. 3 ). Each screen 3 is alternately fixed on a vibrating frame beam 2 and a screen box beam 1 .

The fixing of the vibrating frame crossbeam 2 and preferably also the fixing of the screen box crossbeam 1 takes place preferably substantially in a vibrating frame plane 16 (cf. FIG. 3 ), so that a substantially flat screen surface 6 is produced. Due to certain deflections of the individual screens 3 , system-induced deviations of the straight or flat screen surface 6 result. This is necessary in order to coarsen and stretch the screen 3 .

The sieving machine functions in such a way that the vibrating frame is also vibrated by means of the sieve box 10 vibrating by means of the drive 9 in an amplitude-excited manner. By elastically supporting the connecting rods 5 of the vibrating frame on the screen box 10 , vibrations of the vibrating frame are generated which are offset from the basic vibration of the screen box 10 . By alternately fastening the screen 3 on the screen box 10 or the screen box crossbeam 1 on the one hand and on the vibrating frame crossbeam 2 on the other hand, the screen 3 is alternately roughened and stretched, thereby again achieving optimal Screening effect.

The sieving machine can have a plurality of cover plates with additional sieve surfaces 37 , wherein the additional sieve surfaces are formed by additional sieve surfaces 49 (cf. FIG. 6 )—quite analogously to sieve surfaces 6 . In this way, the sieving material can be divided into several fractions. FIG. 2 shows a side view of a sieving machine comprising two cover plates or sieve surfaces 6 and a single additional sieve surface 37 . FIG. 2 shows an embodiment variant in which the vibrating frame beams 2 assigned to different screen surfaces 6 , 37 are connected to different connecting rods 5 . That is, in this case there are two vibrating systems or two vibrating frames.

However, the use of fastening elements makes it possible to provide several cover plates or screen surfaces 6 , 37 with only one single vibration system. Here, a plurality of vibrating frame beams 2 supporting the screen 3 , the various screen surfaces 6 , 37 are fastened to the fastening element 8 . This has the advantage that the entire device has a particularly low construction, so that it can also be used in a mobile manner. In addition, the adjustment of the vibration system is significantly easier, since only one vibration system has to be adjusted. FIG. 6 shows a sectional view of an embodiment variant comprising a total of two screen surfaces 6 , 37 . Variants comprising more than two screen surfaces 6 , 37 can be constructed in a completely analogous manner and are therefore not further described.

Regardless of the number of cover plates or screen surfaces 6 , 37 , it is advantageous for the continued conveyance of the screened material if the screen surfaces 6 , 37 are substantially inclined in the conveying direction. The start 23 of the screen surface 6 is therefore higher than the end 24 of the screen surface 6 in the operating position, wherein the start 23 is arranged downstream of the end 24 as seen in the conveying direction 32 , see FIG. 2 .

In the exemplary embodiment shown, the conveying direction 32 coincides with the longitudinal direction of the screen box 17 . This inclination has the result that the connecting rod 5 extends at an angle relative to the stationary base 12 in the conveying direction 32 . Correspondingly, a normal direction 28 perpendicular to the vibrating frame plane 16 and pointing from the vibrating frame beam 2 to the associated screen 3 (that is to say, the normal direction 28 points upwards in the operating position) is relative to the vertical The line is inclined or not perpendicular to the fixed base 12.

Furthermore, a banana-shaped design (not shown) can also be realized, which includes a continuously decreasing inclination of the screen box cover. Here, the connecting rod 5 runs obliquely at a decreasing angle relative to the stationary base 12 in the conveying direction 32 . In this case, the screen surface 6, 37 does not form a plane, but rather a curved surface.

It can be seen from the sectional view of FIG. 3 that the screen 3 is bent upwards in the edge region 4 and preferably has no screening holes 44, that is to say, is not perforated, in order to prevent the coarse screening material ("coarse particles") from above Segment 29 accidentally overflows to lower segment 30 .

In order to prevent dust, splashing material (“splash particles”) or pollutants from escaping from the interior of the screening machine or from the screen box 10 in the area of the connecting rods 5 supported by means of rubber buffers 14 into the outside world, for each connecting rod 5 a A connecting rod covering device 11, see FIG. 1 . The connecting rod covering device covers the connecting rod 5 sealingly along the entire longitudinal length of the connecting rod.

In addition, FIG. 7 shows details of two embodiment variants in two isometric views, in which variants, in the corresponding screen box side wall 7 , in the deepest part of the corresponding connecting rod cover 11 A material return opening 48 is provided in the point area. Preferably, the connecting rod cover 11 is inclined in the working position. Splash particles and dust accumulated in the corresponding connecting rod cover 11 are transported by the vibration of the sieving machine to the area around the deepest point of the connecting rod covering 11 and can be redistributed there via the material return opening 48 of the side wall 7 of the screen box. Return to the inside of the sieving machine or in the sieve box 10.

Furthermore, the connecting rod cover 11 has an at least partially U-shaped cross-section in a direction perpendicular to the longitudinal length of the respective connecting rod 5 . This cross-sectional shape makes it possible to connect the connecting rod cover 11 to the side wall 7 of the screen box in a sealing manner. To improve the tightness, a sealing lip (not shown here) made of rubber can be provided, via which sealing lip the connecting rod cover 11 is connected to the screen box side wall 7 .

As shown in FIG. 3 , the U-shaped cross-section of the connecting rod cover 11 is dimensioned such that not only the entire connecting rod 5 but also the rubber buffer by means of which the connecting rod 5 is supported on the screen box 10 The vessel 14 is also hermetically surrounded. In this way, it is possible to enclose the connecting rod 5 and the associated rubber buffer 14 in a sealing manner on five sides. Wherein, as shown in the figure, the connecting rod covering device 11 may be composed of multiple parts. However, a one-piece construction (not shown) is of course also conceivable in principle.

In order to ensure that the connecting rod covering device 11 also encloses the connecting rod 5 with respect to the working position at the front and rear (that is to say in front of and behind the connecting rod 5 viewed in the longitudinal direction of the connecting rod 5 ), preferably the connecting rod covering device 11 is positioned at The cross-section in the vibrating frame plane 16 is designed as U-shaped (not shown).

In order to be able to monitor the mode of operation of the vibration system, in particular the deflection of the connecting rod 5 , an inspection window 27 is provided. The viewing window is typically made of plexiglass.

In order to prevent the penetration of flying particles from the lower section 30 into the region of the connecting rod 5 supported by the rubber buffer 14 , a sealing plate 20 is also provided. Preferably, the sealing plate is arranged on the fastening element 8 on an inner side 15 of the respective screen box side wall 7 . That is to say, the screen box side wall 7 is located between the sealing plate 20 and the connecting rod 5 . Each screen box side wall 7 has a through hole 21, so as to realize the connection between the vibrating frame beam 2 and the corresponding connecting rod 5. That is to say, the vibrating frame beam 2 is connected to the corresponding connecting rod 5 through the through hole 21 . Each sealing plate 20 surrounds a through hole 21 .

In the embodiment shown in FIG. 3 , the sealing plates 20 are arranged on the fastening element 8 at a small distance from the inner side 15 of the screen box side wall 7 , wherein each sealing plate 20 is fastened to the associated fastening element 8 superior. A labyrinth-like seal is formed outwardly by the corresponding sealing plate 20 , the remaining internal clearance of the corresponding through-opening 21 is minimized, see FIG. 5 . The risk of flying particles passing through the through hole 21 is thus minimized.

FIG. 5 shows a detail view from the outside looking in the direction of the connecting rod 5 . Correspondingly, the fastening element 8 and the sealing plate 20 including through-openings 21 are indicated by dashed lines. It can be clearly seen that in this figure the vibrating frame beam 2 and the fastening element 8 are only partially arranged in the through-opening 21 .

In order to prevent sieve material from splashing out of the upper section 29 , a flexible cover 19 is provided which seals the sieve box 10 tightly above the sieve surface 6 in the operating position. It is designed to be elastic and is formed, for example, from canvas or PVC fabric. The cover plate 19 closes the upper section 29 in the normal direction 28 and is connected to the screen box side walls 7 and an intermediate support 19 , ie the cover plate 19 vibrates together with the screen box 10 .

In the sectional view shown in FIG. 4 (see tangent line B-B in FIG. 2 ), it can be seen that the cover plate 19 is tensioned by means of a tensioning element 43 , for example by means of an elastic cord via fastening hooks 42 fastened to the side walls 7 of the screen box. . The intermediate support 18 is secured in a known manner, for example by means of clamping plates (not shown).

The intermediate support 18 is supported on a cover beam 50 . The intermediate support 18 extends in the longitudinal direction 17 and is preferably arranged centrally with respect to the screen surface 6 .

For optimal suppression of dust formation, the cover plate 19 has a preferably centrally located hole 36 . A suction connection 35 , which is connected in a known manner to the cover plate 19 , is connected in a sealing manner to this opening. A convenient connection to an exhaust line 39 is possible via the suction connection 35 . In order to compensate for movements or vibrations of the screen box 10 or the cover plate 19 , the exhaust line 39 is not connected directly to the suction connection 35 but via an elastic connection 38 .

In order to be able to convey the screened material to the screen surface from the outside and avoid the splashing of the screened material and the escape of dust during the conveying process, a feed sealing frame 22 is provided. The feed material sealing frame is arranged downstream of the screen box 10 as seen in the normal direction 28 . The feed seal frame 22 has a feed opening 33 through which the screening material is guided. To this end, the feed sealing frame 22 is arranged at least partially between the start 23 and the end 24 of the screen surface 6 as seen in the normal direction, preferably inside the feed opening 33 as seen in the normal direction 28 . The feed material sealing frame 22 is hermetically closed by the screen box side wall 7 , the cover plate 19 and a first end face 25 of the screen box 10 . The feed seal frame 22 is designed in such a way that a feed pipe 45 , which guides the screening material, can be connected to the feed seal frame 22 in a known manner in a sealed manner, see FIG. 2 .

Screened material that does not pass through the meshes of the screen from the upper section 29 to the lower section 30 before reaching the end 24 of the screen surface 6 must be discharged from the upper section 29 . In order to suppress splashing and dust formation of the sifted material here, a discharge sealing frame 26 with discharge opening 34 is provided. The discharge sealing frame is arranged downstream of the screen box 10 viewed in the normal direction. The screened material can be discharged to the outside through the discharge port 34 or into a discharge pipe 46 . In this case, the discharge sealing frame 26 is designed in such a way that the discharge tube 46 can be connected to the discharge sealing frame 26 in a manner known per se via a flexible connection, see FIG. 2 . The discharge sealing frame 26 is hermetically closed by the screen box side wall 7 and a second end face 31 of the screen box 10 .

The screened material passing through the meshes 44 of the screen from the upper section 29 to the lower section 30 is referred to as undersize and must be discharged from the lower section 30 . In order to suppress splashing and dust formation of undersize particles, a lower section sealing frame 40 including undersize particle discharge openings 41 is provided. The lower section sealing frame is arranged in front of the screen box 10 as seen in the normal direction 28 . The undersize can be discharged to the outside through the undersize discharge opening 41 or into a lower section discharge pipe 47 . In this case, the lower section sealing frame 40 is designed such that a lower section discharge pipe 47 can be connected in a known manner to the lower section sealing frame 40 via a flexible connection, see FIG. 2 . The lower section sealing frame 40 is hermetically closed by the screen box 10 .

List of reference signs

1. Screen box beam

2. Vibrating frame beam

3. Sieve

4. Screen edge area

5. Connecting rod

6. Sieve surface

7. Screen box side wall

8. Fixing elements

9. Unbalanced driving device

10. Screen box

11. Connecting rod covering device

12. Base

13. Spring

14. Rubber buffer

15. Inner side of screen box side wall

16. Vibration frame plane

17. Longitudinal direction of screen box

18. Middle bracket

19. Cover plate

20. Sealing plate

21. Through hole

22. Feeding sealing frame

23. The beginning of the screen surface

24. The end of the screen surface

25. The first end face of the screen box

26. Discharging sealing frame

27. Observation window

28. Normal direction

29. Upper section

30. Lower section

31. The second end face of the screen box

32. Conveying direction

33. Feeding port

34. Discharging port

35. Suction pipe joint

36. Hole for cover plate

37. Additional screen surface

38. Elastic connector

39. Exhaust pipe

40. Lower section sealing frame

41. Particle discharge port under the sieve

42. Fixed hook

43. Tensioning elements

44. Screen mesh

45. Feeding pipe

46. Discharge pipe

47. Lower section discharge pipe

48. Material return port

49. Additional screens

50. Cover beams

Claims (20)

1. screening machine, comprise screen box (10), can make described screen box vibration and described screen box there is each screen box sidewall (7) by drive unit (9), described screen box in the operating position of screening machine flexibly, preferably be supported on fixing base (12) by spring (13), in addition described screening machine also comprises the vibrating frame being flexibly coupled with screen box (10), described vibrating frame comprises the each connecting rod (5) flexibly connecting with each screen box sidewall (7) and the vibrating frame crossbeam (2) that each connecting rod is connected, and described screening machine comprises the compass screen surface (6) being formed by screen cloth (3), wherein, screen cloth (3) is by being alternately fixed on screen box (10), the screen box crossbeam (1) that preferably makes each screen box sidewall (7) connect is upper and at vibrating frame, preferably on vibrating frame crossbeam (2), at least segmentation is alternately pressed thick or is stretched, wherein the fringe region (4) extending transverse to vibrating frame crossbeam (2) of screen cloth (3) is upwards drawn, it is characterized in that, for at least one connecting rod (5) arranges connecting rod cladding system (11), described connecting rod cladding system (11) has the cross section of U-shaped in the direction of the longitudinal length perpendicular to corresponding connecting rod (5), and described connecting rod cladding system (11) is connected hermetically with screen box sidewall (7), and described connecting rod cladding system outwards surrounds corresponding connecting rod (5) hermetically about operating position.

2. screening machine according to claim 1, it is characterized in that, it is upper that connecting rod (5) is flexibly connected to each screen box sidewall (7) by rubber bumper (14), and connecting rod cladding system (11) also surrounds and attaches troops to a unit in the rubber bumper (14) of respective link (5) hermetically.

3. screening machine according to claim 1, is characterized in that, connecting rod cladding system (11) has at least one observation window (27).

4. according to the screening machine described in any one in claim 1～3, it is characterized in that, inner side (15) in screen box sidewall (7) arranges at least one sealing plate (20), and described sealing plate surrounds the through hole (21) of screen box sidewall (7), wherein, see along the direction parallel with the longitudinal length of vibrating frame crossbeam (2), a vibrating frame crossbeam (2) is correspondingly set in through hole (21).

5. screening machine according to claim 4, is characterized in that, each sealing plate (20) form for each screen box sidewall (7) corresponding through hole (21) labyrinth form sealing device and be connected with vibrating frame.

6. according to the screening machine described in any one in claim 1～3, it is characterized in that, minimum point region for operating position at corresponding connecting rod cladding system (11), in corresponding screen box sidewall (7), material reflow mouth (48) is set, possible particle and the dust of splashing can flow back in screen box (10) by described material reflow mouth.

7. according to the screening machine described in any one in claim 1～3, it is characterized in that, be provided with flexible cover plate (19), described cover plate is sealed shut screen box (10) in operating position in the top of compass screen surface (6).

8. screening machine according to claim 7, it is characterized in that, the cover plate (19) of described flexibility is connected with screen box sidewall (7) and intermediate support (18), wherein, longitudinal (17) that intermediate support (18) is parallel to screen box (10) are extended and are arranged between screen box sidewall (7), are preferably arranged on central authorities about compass screen surface (6), and intermediate support is preferably supported at least one cover plate beam (50).

9. screening machine according to claim 7, it is characterized in that, be provided with at least one suction tube joint (35), described suction tube joint is arranged on the top, a hole (36) of flexible cover plate (19) and is connected with flexible cover plate (19) hermetically on operating position, wherein, on described at least one suction tube joint (35), can connect at least one blast pipe (39).

10. screening machine according to claim 9, is characterized in that, is provided with at least one flexible connector (38), for described at least one blast pipe (39) is connected with described at least one suction tube joint (35).

11. screening machines according to claim 7, it is characterized in that, be provided with the feed sealing frame (22) of surrounding material inlet (33), wherein, can carry screening materials carrying to from the outside in operating position compass screen surface (6) by described material inlet (22), feed sealing frame (22) is arranged on the top of compass screen surface (6) on operating position, and feed sealing frame (6) is connected hermetically with first end face (25) of screen box (10), and screen box sidewall (7) is connected hermetically with flexible cover plate (19).

12. screening machines according to claim 11, it is characterized in that, along seeing on throughput direction, compass screen surface (6) has a top (23) and one and is positioned at this top end (24) below, see along normal orientation (28), material inlet (33) is at least partially disposed between the top (23) and end (24) of compass screen surface (6), wherein, the vibrating frame plane (16) at this normal orientation (28) and vibrating frame crossbeam (2) place is vertical and point to screen cloth (3) from vibrating frame crossbeam (2), that is to say, in operating position from bottom to top.

13. according to the screening machine described in any one in claim 1～3, it is characterized in that, be provided with the discharge sealing frame (26) of surrounding discharge gate (34), wherein, screening materials carrying outwards can be carried from the end (24) of compass screen surface (6) in operating position by described discharge gate (34), discharge sealing frame (26) is at least partially disposed on the below of compass screen surface (6) in operating position, and discharge sealing frame (26) is connected hermetically with second end face (31) and the screen box sidewall (7) of screen box (10), wherein, see along throughput direction (32), the second end face (31) is positioned at the downstream of the first end face (25).

14. screening machines according to claim 13, is characterized in that, see along throughput direction (32), and discharge gate (34) is at least partially disposed on the downstream of the end (24) of compass screen surface (6).

15. according to the screening machine described in any one in claim 1～3, it is characterized in that, be provided with the lower section sealing frame (40) of surrounding the lower particle discharge gate (41) of sieve, wherein, particle under sieve can be carried to the outside in operating position by particle discharge gate (41) under described sieve, lower section sealing frame (40) is arranged on the below of screen box (10) in operating position, and lower section sealing frame (40) is connected hermetically with screen box (10).

16. according to the screening machine described in any one in claim 1～3, it is characterized in that, connecting rod (5) extends with respect to fixing base (12) with an angle or with an angle reducing along throughput direction (32) along throughput direction (32) obliquely in operating position.

17. according to the screening machine described in any one in claim 1～3, it is characterized in that, on vibrating frame, be preferably provided with retaining element (8) on connecting rod (5), described retaining element is for being fixed on vibrating frame vibrating frame crossbeam (2).

18. according to the screening machine described in any one in claim 1～3, it is characterized in that, be provided with the extra compass screen surface (37) that at least one forms by extra screen cloth (49), wherein, extra screen cloth (49) is to be also alternately fixed on screen box (10), preferred screen box crossbeam (1) and on vibrating frame, preferred vibrating frame crossbeam (2).

19. screening machines according to claim 18, is characterized in that, the multiple vibrating frame crossbeams (2) that are fixed with the screen cloth (3,49) of different compass screen surfaces (6,37) are fixed therein on a retaining element (8).

20. screening machines according to claim 18, is characterized in that, each compass screen surface (6,37) extends parallel with respect to each other .ly.