Screening machine with a screening box

Abstract

The invention relates to a screening machine (10) with a screening box (60) in which at least one screening lining (20) is arranged between two side walls (61), wherein the screening lining (20) is assigned a screening tensioner (40), the longitudinal ends of which are guided through a respective passage (62) in the side wall (61). If, in such a screening machine, at least one of the passages (62) is covered at least in part by a removable cover (70) on its outer side facing away from the screening lining (20), wherein the cover (70) rests on the outer side of the side wall (61) with a sealing surface (72) of a sealing element (74) facing the side wall (61), then the escape of dust is prevented and operational and work safety is thus improved.

Description

[0001] The invention relates to a screening machine with a screening box in which at least one screening layer is arranged between two side walls, wherein the screening layer is assigned a screening tensioner which is guided with its longitudinal ends through a respective passage of the side wall.

[0002] DE 25 01 750 A discloses a screening machine with a screen box. Three screen panels are arranged one above the other. These screen panels are designed as grid floors with a bevel at their longitudinal ends. The bevels are bent in the direction from the top of the screen panel to the bottom. The bevels have a V-shaped cross-section. Screen tensioners in the form of rods engage in these bevels. The screen tensioner has a clamping projection on one clamping side that forms a clamping edge. This clamping edge rests against the bottom of the bevel. At the longitudinal ends, the screen tensioners have fastening sections on which clamping elements act to tension the screen panel in the screen box. The fastening sections lead out of the screen box through slot-like openings in the side walls and can be tensioned outside the screen box using suitable clamping devices.

[0003] EP 0 238 455 A2 discloses a screening machine in which a screen panel is pre-tensioned with a screen tensioner in the form of a hollow profile. The screen tensioner has a molded-on clamping projection that forms a clamping edge.

[0004] The object of the invention is to improve the operational reliability of the screening machine described above.

[0005] This object is achieved in that at least one of the passages of the side walls is covered, at least in part, with a removable cover on its outer side facing away from the screen lining, wherein the cover sits on the outer side of the side wall with a sealing surface of a sealing element facing the side wall.

[0006] During operation of the screening machine, dust can escape into the environment through the openings in the side wall. Depending on the composition of the material to be crushed, the dust can lead to incrustations and deposits in the area of ​​the tensioning device of the screen tensioner, thus limiting the accessibility and functionality of the screen tensioner. In addition, the dust also pollutes other machine components and people working in the vicinity of the screening machine. To prevent dust from escaping, the invention proposes a cover that closes the opening in the side wall when the screen tensioner is properly installed. The cover is easy to install because it is arranged on the outside of the side wall and rests on the side wall with its sealing surface. This makes installation simple and reliably ensures operational safety.

[0007] According to a preferred variant of the invention, the sealing element can be made of magnetic material or have at least one magnetic element. A magnetic connection can be established between the cover and the side wall using the magnetic material or the at least one magnetic element. The cover is thus securely attached to the side wall. This type of connection also has the advantage that when the screen tensioner is tightened, it can be offset relative to the side wall. With the offset movement of the screen tensioner, the cover can also be moved and brought into the appropriate position. This enables the magnetic connection.

[0008] Particularly preferably, the sealing element can be provided with a flat, in particular strip-shaped, cut-out made of magnetic material. This allows the cover to be constructed in a space-saving manner with a low overall height. At the same time, the mechanical assignment of the cover to the side wall is guaranteed regardless of its exact position relative to the side wall. This is advantageous because the positional assignment can change during tensioning of the screen lining due to material elongation of the screen lining or due to dimensional tolerances between different screen linings.

[0009] Advantageously, the sheet-like blank extends laterally alongside the associated feedthrough with longitudinal overlapping sections and / or transverse overlapping sections to establish a magnetic connection with the side wall there. The longitudinal overlapping sections run in the direction of the longitudinal extension of the slot-like feedthrough. The transverse overlapping sections run transversely to the direction of the longitudinal extension of the slot-like feedthrough.

[0010] According to one possible variant of the invention, it can be provided that a cover section is directly or indirectly connected to the sealing element. In this case, it can advantageously be provided that the cover section has a flat, in particular strip-shaped, cut-out, preferably consisting of a soft elastic material, in particular a rubber or rubber-like material. With such a flat cut-out, the sealing element, for example consisting of a flexible material, can be mechanically supported, so that the overall handling of the cover is improved. Advantageously, the sealing element is constructed in such a way that it provides a flat seal around the feedthrough, so that an ideal sealing effect is achieved, even if certain surface irregularities are present.Especially when combined with a cover section in the form of a flat cut, the cover adapts to the existing conditions on the side wall. The sealing element preferably extends completely around the penetration.

[0011] The cover can be easily manufactured if the sealing element is integrally bonded, preferably glued, to the cover section. This also allows for a compact design.

[0012] A possible variant of the invention can be characterized in that the cover has an opening which is at least partially aligned with the passage of the side wall and through which the screen tensioner is passed, and in that the sealing element circumferentially surrounds the opening on its side facing the side wall.

[0013] A further variant of the invention can be such that the cover has an opening which is at least partially aligned with the passage of the side wall and through which the screen tensioner is passed, and that the sealing element surrounds the opening on its side facing the side wall all the way around, preferably completely around. This results in simple assembly. After the screen tensioner is connected to the screen lining, the covers can be threaded with their openings onto the fastening sections of the screen tensioner. They are then already essentially aligned and positioned correctly. The covers are then pushed against the associated side wall and fastened thereto, which also creates a seal. It proves advantageous if the fastening section of the screen tensioner has a non-circular, preferably rectangular, cross-section.

[0014] A preferred variant of the invention can be such that the screen tensioner has a rod-like or profile-like tensioning section which has a fastening section in the region of its two longitudinal ends, that the tensioning section has a first tensioning projection in the region of a first tensioning side which forms a first tensioning edge and a second tensioning projection on an opposite second tensioning side which forms a second tensioning edge, that the first tensioning edge and the second tensioning edge extend between the two fastening sections, that the first tensioning edge forms a first and the second tensioning edge forms a second tensioning contour and that preferably the first and the second tensioning contour have different geometries. The tensioning edges can have the same or a different geometry.

[0015] Because the screen clamp has two clamping edges, it can be used to clamp either edge into engagement with the screen panel being installed. If the clamping edges have different geometric shapes and are therefore designed for a specific screen panel, the user can clamp two different screen panels in one screening device without having to replace the screen clamp. The same screen clamp can be used, preferably in reverse, in two different mounting positions. This makes maintenance of the screening machine much easier. The same cover can be used for these different mounting situations to conceal the opening in the side wall.

[0016] One of the two clamping edges can be convex, with a curvature extending between the two fastening sections, and the other clamping edge can be convex or concave, with a curvature extending between the two fastening sections, or the other clamping edge can run in a straight line between the two fastening sections. If one clamping edge is convex and the other clamping edge is concave, it is advantageous if the contours followed by the two clamping edges differ from one another, preferably with the amount of camber being different on both sides.

[0017] The curvature of the convex clamping edge of one clamping projection can be designed to suit a particular screen lining in order to clamp it in the screen box with as uniform a tension as possible. When the screen lining is tensioned, the clamping edge with the furthest protruding area first comes into contact with the associated fastening edge of the screen lining and tensions it there. As the screen tensioner is further tensioned, it deforms elastically, with the remaining areas of the clamping edge gradually coming into contact with the screen lining and tensioning it there. As a result, uniform tension is achieved across the entire width of the screen lining. This takes into account the realization that evenly tensioned screen linings have a longer service life and that inherent properties of the screen lining, such as self-cleaning, are supported.

[0018] If the second clamping edge is also convex, the degree of curvature can be designed to suit the corresponding screen lining in order to pre-tension it evenly.

[0019] If the second clamping edge is concave, this type of screen tensioner is suitable for screen surfaces that require greater tension on two sides. These sides therefore come into contact with the concave geometry of the screen tensioner first.

[0020] If the second clamping edge is straight, the screen tensioner can be used on the straight edge for screen media that requires only a low level of screen tension. The second clamping edge is therefore ideal for light, delicate screen media, for example. These require less pre-tensioning. Due to the lower pre-tensioning force, a strongly curved clamping edge is not elastically deformed to the same extent, so that the outer areas of the light screen media do not make contact with the clamping edge and remain untensioned.

[0021] If, according to a variant of the invention, the two longitudinal ends of the screen tensioner each have a fastening section, a tensioning device with a tensioning piece acts on the fastening section to tension the screen lining in the tensioning direction, and the cover is arranged in the area between the tensioning piece and the side wall of the screen box, then the cover is housed behind the tensioning piece, protected from mechanical influences. Furthermore, the tensioning piece can then also provide a certain degree of positional security for the cover.

[0022] The clamping device is of simple construction if it is provided that two legs arranged at a distance from one another are connected to the clamping piece, and that the two legs and the clamping piece delimit a receptacle in which the fastening section of the screen clamp is received.

[0023] A protected accommodation of the cover can also be achieved if it is provided that the legs are each equipped with a threaded receptacle, wherein the central longitudinal axes of the threaded receptacles run in the clamping direction, that a support bearing with a holder is fastened to the side wall, that the holder has screw receptacles through which clamping screws are passed and screwed into the threaded receptacles of the legs, that two bearing pieces are connected to the holder, which are fastened to the side wall and arranged at a distance from one another, and that the holder and the support bearings delimit at least partially a section of the side wall within which the cover is arranged.

[0024] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. They show: Figure 1 a screening machine in side view, Figure 2in schematic detail a screening deck of the screening machine according to Figure 1 , Figure 3 in perspective partial view a clamping device for a screen lining of the screening machine according to Figure 1 , Figure 4 in plan view and in partial view a screen tensioner for the screening machine according to Figure 1 in association with a screen lining and in horizontal section, Figure 5 the representation according to Figure 4 in an expanded view, Figure 6 a further embodiment of the invention, in which a screen box of the screening machine according to Figure 1 is shown in a schematic sectional view through a screen lining and Figure 7 in schematic side view a sealing arrangement for the screening machine according to the Figures 1 to 6 and Figure 8 the sealing arrangement according to Figure 7 in front view.

[0025] Figure 1shows a screening machine 10 according to the invention. This screening machine 10 is designed as a mobile screening machine. It is also conceivable that the invention is used in a stationary screening machine. Furthermore, it is conceivable that the machine is used in a combined crushing and screening plant.

[0026] The screening machine 10 has a chassis 11, which is supported by carriages 11.1 to enable the screening machine 10 to be moved. Preferably, the screening machine 10 has a feed hopper 12. Material to be screened can be fed into the feed hopper 12 using a wheel loader.

[0027] The feed hopper 12 has a transport device, for example a vibrating chute, a conveyor belt, a feed belt, or a hopper discharge belt, by means of which the fed material can be conveyed to a feed belt 13. The feed belt 13 can be designed as an endlessly rotating conveyor belt. The feed belt 13 conveys the material to be screened to a screening device having a screen box 60.

[0028] The screening device serves to separate at least two fractions from the supplied material. For this purpose, the screening device has at least one screen lining 20, as Figure 2 shows.

[0029] Figure 1 further illustrates that the screen box 60 has side walls 61 which run in the longitudinal direction of the screen.

[0030] The screen box 60 is mounted to a stationary screen box support 64 by means of spring elements 63. The screen box 60 can be set into vibration by means of a drive 65 in order to screen the material.

[0031] The screening device is assigned at least one discharge belt 14.1, 14.2 or at least one fine grain or stockpile belt 15. In the present embodiment, two discharge belts 14.1, 14.2 and one fine grain or stockpile belt 15 are used. Accordingly, two screen linings 20 are installed in the screening device.

[0032] The material to be screened is fed onto the upper screen layer 20. The material that falls through the upper screen layer 20 reaches the screen layer 20 below. Material that does not fall through the upper screen layer 20 reaches one of the two discharge belts 14.1, 14.2. The material that does not fall through the second screen layer 20 reaches the second discharge belt 14.1, 14.2. The material that falls through both screen layers 20 in the form of fine-grained material reaches the fine-grain or stockpile belt 15. The two discharge belts 14.1, 14.2 and the fine-grain or stockpile belt 15 each convey the grain fractions fed to them to stockpiles 16.

[0033] Figure 2shows a schematic representation of a section of the screening device. As the illustration illustrates, support elements 30 are installed in the screen box 60, which support the screen lining 20. The support elements 30 have a fastening foot 32 with which they are fixed in place in the screen box 60. Damping elements 31 are replaceably mounted on one side of the support elements 30, opposite the fastening foot 32. The damping elements 31 support the screen lining 20 in the area of ​​the screen underside 22.

[0034] The support elements 30 can be arranged and aligned with their damping elements 31 in such a way that the screen lining 20 resting on the damping elements 31 forms an arcuate contour in the longitudinal direction of the screen, as Figure 2 shows.

[0035] The Figure 2The left-hand support element 30 has a holder attachment 33 at its end facing away from the fastening foot 32. The screen lining 20 is held replaceably on the holder attachment 33 by a fastening edge 23.

[0036] The screen lining 20 is designed as a flat element and has a screen upper side 21 opposite the screen lower side 22. The fastening edge 23 may be bent from an end section 23.1 of the screen lining 20 to form an angled portion 23.2. The retaining projection 33 engages this angled portion 23.2.

[0037] At the end facing away from the fastening edge 23, the screen lining 20 has a further fastening edge 24, which is essentially structurally identical to the fastening edge 23. Accordingly, a bend 24.2 is bent from the screen lining 20 at the opposite end section 24.1.

[0038] The screen lining 20 must be positioned in the screen box 60 in the longitudinal direction (i.e. in Figure 2from left to right). For this purpose, a screen tensioner 40 is used. The Figures 3 and 5 illustrate that the screen tensioner 40 is essentially rectangular in cross-section. The screen tensioner 40 can therefore have a rod-shaped geometry.

[0039] The screen tensioner 40 has a central tensioning section 41 which extends between two end fastening sections 46.

[0040] The clamping section 41 has clamping projections 42, 43 on its opposite longitudinal sides. The first clamping projection 42 has a first clamping edge 42.1. The second clamping projection 43 has a second clamping edge 43.1.

[0041] The first clamping edge 42.1 runs convexly curved between the two fastening sections 46, such as Figure 4 illustrated. Figure 4shows a horizontal section through the central transverse plane MQ of the screen tensioner 40. The central transverse plane MQ and thus the cutting plane according to Figure 4 is in Figure 3 marked.

[0042] Evidentially Figure 4 The first clamping edge 42.1 forms a clamping contour. This clamping contour has contour end sections 49.1 at its longitudinal ends and a contour center 49.2 centrally between the contour end sections 49.1. In the clamping direction, which is Figure 4 runs from right to left, the projection of the first clamping edge 42.1 into the central transverse plane MQ has a maximum camber H in the region of the contour center 49.2. This maximum camber H results from the fact that the contour center 49.2 is offset in the clamping direction relative to the contour end sections 49.1 due to the convex curvature. Preferably, the camber H is less than 25 mm.

[0043] The second clamping edge 43.1, which is opposite the first clamping edge 42.1, also forms a clamping contour. This clamping contour again forms contour end sections 49.1 at opposite ends, which face the fastening sections 46. A contour center 49.2 is formed centrally between the contour end sections 49.1. In the present exemplary embodiment, the projection of the second clamping edge 43.1 into the central transverse plane MQ runs straight between the two fastening sections 46, as Figure 4 However, it is also conceivable that the second clamping edge 43.1 is convexly curved and has a maximum elevation which preferably deviates from the maximum elevation H of the first clamping edge 42.1.

[0044] It is also conceivable that the second clamping edge 43.1 forms a concave contour. In this case, a negative camber H results in the contour center 49.2. Preferably, the magnitude of the two cambers H of the two clamping edges 42.1, 43.1 differs from each other.

[0045] In other words, different clamping contours are realized on the screen tensioner 40 at the two clamping edges 42.1, 43.1.

[0046] As the illustrations further show, it is preferably the case that the screen tensioner 40 is constructed symmetrically to the central transverse plane MQ.

[0047] In the embodiment shown, the screen tensioner 40 engages with its first clamping projection 42 in the Figure 2 shown right-hand bend 24.2. The screen tensioner 40 rests with its first clamping edge 42.1 on the bottom section 42.3 below the screen underside 22 resulting from the bend 24.2.

[0048] Thus, the clamping projection 42 is at least partially enclosed between the sieve underside 22 and the angled portion 24.2.

[0049] The sieve tensioner 40 engages on opposite sides with its fastening sections 46 through passages 62 in the associated side walls 61 of the sieve box 60, as Figure 3 . Accordingly, the fastening sections 46 protrude on the outside beyond the side walls 61 of the screen box 60. Clamping devices 50 are arranged in the area of ​​the passages 62 of the screen box 60, with which the screen tensioner 40 can be adjusted in the clamping direction along the central transverse plane MQ.

[0050] The clamping devices 50 each have a stationary support bearing 56, which is preferably firmly connected to the side wall 61, for example welded.

[0051] The support bearing 56 can be configured such that it has a holder 57 to which at least one bearing piece 56.1 is connected, preferably integrally formed. By means of the two bearing pieces 56.1 and the holder 57, the support bearing 56 can be stably connected to the associated side wall 61. The clamping device 50 further comprises a clamping piece 52, by means of which the screen tensioner 40 is positively engaged in order to displace it in the clamping direction. In this case, legs 51, 53 can be connected, preferably integrally formed, to the clamping piece 52 on opposite sides.

[0052] Between the legs 51, 53 there is a receptacle 54 for the screen tensioner 40. The leg 53 engages over the top and the leg 51 over the bottom of the screen tensioner 40, so that the screen tensioner 40 is prevented from deflecting in these directions when it is tensioned.

[0053] To adjust the clamping piece 52 in the clamping direction, at least one clamping screw 58 is used, by means of which the clamping piece 52 can be continuously adjusted. The clamping screw 58 rests on the holder 57. The continuous adjustment of the clamping piece 52 can be achieved via a threaded connection.

[0054] In the present embodiment, each of the legs 51, 53 has a threaded receptacle 55. The holder 57 has two passages through which the clamping screws 58 are inserted and screwed into the threaded receptacles 55.

[0055] The Figures 4 and 5show an assembly position in which the screen clamp 40 is in an unclamped position. If the clamping screws 58 of the two clamping devices 50 are now tightened, the screen clamp 40 with its two fastening sections 46 is displaced in the bushings. In doing so, the first clamping edge 42.1 meets the base section 24.3 in the area of ​​its contour center 49.2 with its maximum elevation H (see Figure 4) of the bend 42.1. If the clamping screws 58 are now tightened further, the screen lining 20 is tensioned, starting from the contour center 49.2. This results in a counterforce of the screen lining 20, which acts on the screen tensioner 40. Due to this counterforce, the screen tensioner 40 is bent so that the first clamping edge 42.1 continuously contacts the base section 24.3 towards the two contour end sections 49.1. In this way, the clamping force is successively applied to the screen lining 20. The convexly curved contour of the first clamping edge 42.1 thus ensures uniform tensioning of the screen lining 20.

[0056] When the clamping devices 50 are tightened, the clamping piece 52 is displaced in the clamping direction. This ensures that the fastening section 46 is Figure 3 is displaced from left to right along the slot-shaped passage 62.

[0057] Once a sufficiently uniform tension has been generated in the screen lining 20, the assembly process is complete. The uniform tension can be estimated by performing a sound test at individual points on the screen lining 20. For this purpose, the screen lining 20 is struck at various points. The tension state can be determined from the sound generated.

[0058] Disassembly of the screen lining 20 is carried out in the reverse order. First, loosen the clamping screw 58, then slide the screen tensioner 40 in the bushings 62 until it disengages from the angled portion 24.2. The screen lining 20 can then be lifted upwards and moved in the opposite direction to the clamping direction, so that the angled portion 23.2 disengages from the retaining projection 33 (see Figure 2 ). The screen lining 20 can then be lifted out of the screen box 60 and replaced with a new screen lining 20.

[0059] If the second screen lining 20 is not identical to the first screen lining 20 and requires a different, in particular less, pre-tension than the previously installed screen lining 20, the screen tensioner 40 can be adapted to this second screen lining 20. For this purpose, it only needs to be rotated so that the second clamping edge 42.1 engages with the associated bend 24.2 of this screen lining 20. The screen tensioner 40 can then be clamped to the new screen lining 20 in the same way as explained above.

[0060] In other words, the screen tensioner 40 can be used to optimally tension two different screen linings 20.

[0061] To facilitate the correct assignment of the desired clamping edge 42.1, 43.1 to the respective screen lining 20, an identification mark 48 can be provided in the area of ​​at least one fastening section 46. The identification mark 48 is in Figure 4 shown by way of example. Preferably, the identification marking 48 is incorporated into the longitudinal end of the fastening section 48.

[0062] Figure 3 illustrates that the passages 62 in the side walls 61 of the screen box 60 are each closed with a cover 70. This prevents dust from escaping from the screen box 60 through the passages 62 into the environment.

[0063] The structure of the covers 70 results from Figures 7 and 8 The cover 70 is shown in both a front and a side view. The cover 70 has an outer cover portion 73, which preferably forms the outer side 71 of the cover 40.

[0064] On the inner side facing away from the outer side 71, which faces the side wall 61, a sealing element 74 is directly or indirectly connected to the cover section 73. In the present exemplary embodiment, the sealing element 74 is directly connected to the cover section 73, for example, by adhesive bonding.

[0065] The sealing element 74 can be formed by a continuous layer element, preferably consisting of a magnetic material or comprising a magnetic, in particular flat, material. For example, the sealing element 74 can be formed by a sandwich element. However, it is also conceivable that the sealing element 74 is not formed by a flat element, but rather has flat regions in sections.

[0066] The sealing element 74 is connected to the cover section 73 via a connecting layer 75. Preferably, a material connection is provided between these two components.

[0067] The cover section 73 can preferably be formed from a flat, particularly strip-shaped, blank in the form of a soft-elastic material. It is also conceivable for the cover section 73 to be formed from a strip of material.

[0068] As the representation according to Figure 7 shows, the sealing element 74 forms an inner sealing surface 72 which is placed on the outside of the side wall 61 of the sieve box 60 and which covers the area around the passage 62 at least in part.

[0069] Preferably, the cover 70 forms a longitudinal overlap area 76, which in the assembled state projects beyond the longitudinal end of the leadthrough 62. The arrangement of the leadthrough 62 with respect to the cover 70 is shown in Figure 7 symbolized by a dashed line. Thus, the longitudinal overlap sections 76 cover the areas adjacent to the passage 62 on the longitudinal side.

[0070] Furthermore, it may be additionally or alternatively provided that the cover 70 has transverse overlapping sections 77 which are arranged at a distance from one another. Figure 7 shows, the transverse overlap sections 77 serve to cover and seal the areas that laterally adjoin the long sides of the bushing 62.

[0071] The cover 70 preferably has a passage 78. The position and size of the passage 78 are configured such that the screen tensioner 40 with its associated fastening section 46 can be pushed through the end of the cover 70 or the cover 70 can be plugged onto the fastening section 46. The clear cross-sectional area of ​​the passage 78 is preferably dimensioned such that it is the same size as the outer dimensions of the fastening section 46 or slightly larger than the outer dimensions of the fastening section 46 in order to achieve the best possible seal.

[0072] The assignment of the cover 70 to the side wall 61 of the sieve box 60 is shown in Figure 3shown. As this illustration illustrates, the cover 70 with its passage 78 can be pushed over the fastening section 46 of the screen tensioner 40. The sealing surface 72 of the sealing element 74 then comes into contact with the outer side of the side wall 62. The cover 70 is held to the side wall 61, which is made of ferromagnetic material, by means of the magnetic element(s) of the sealing section 74.

[0073] In the assembled state, the sealing element 74 can thus preferably come into contact directly (or indirectly) with the side wall 62. The cover section 73 faces the clamping piece 52. The cover section 73 can preferably serve as a carrier material for the sealing element 74.

[0074] Preferably, according to the invention, the sealing element 74 can be provided with a thickness in the range of 0.5-5 mm, i.e., it is very thin. The associated cover layer then prevents premature component failure. Furthermore, the greater thickness facilitates handling, as the cover 70 can be gripped and removed more easily.

[0075] Advantageously, a cover 70 according to the invention has a sandwich construction, with one side being more magnetic than the other. This ensures that the cover 70 adheres to the side wall 62 and not to an opposing material, for example, the clamping piece 52.

[0076] After the cover 70 has been mounted as described above, the clamping piece 52 can be assigned to the screen clamp 40 as described above. The screen clamp 40 can then be tensioned. The fastening section 46 pulls the cover 70 along in the tensioning direction, since the fastening section 46 rests circumferentially against the inner contour forming the passage 78. This displacement of the cover 70 is not prevented by the magnetic connection, so that the cover 70 is always optimally assigned to the side wall 61 and the fastening section 46, and the passage 62 is optimally sealed.

Claims

1. Screening machine (10) with a screen box (60) in which at least one screen lining (20) is arranged between two side walls (61), wherein the screen lining (20) is assigned a screen tensioner (40) which is guided with its longitudinal ends through a respective passage (62) of the side wall (61), characterized by that at least one of the passages (62) is covered, at least in part, with a removable cover (70) on its outer side facing away from the screen lining (20), the cover (70) being seated on the outer side of the side wall (61) with a sealing surface (72) of a sealing element (74) facing the side wall (61).

2. Screening machine according to claim 1, characterized in that the sealing element (74) consists of magnetic material or has at least one magnetic element.

3. Screening machine according to claim 2, characterized in thatthe sealing element (74) has a flat, in particular strip-shaped, cut-out made of magnetic material.

4. Screening machine according to claim 3, characterized in that the flat cut of the sealing element (74) with longitudinal overlap sections (76) and / or transverse overlap sections (77) runs laterally next to the associated passage (62) in order to establish a magnetic connection with the side wall (60) there.

5. Screening machine according to one of claims 2 to 4, characterized in that a cover section (73) is directly or indirectly connected to the sealing element (74).

6. Screening machine according to claim 5, characterized in that the cover section (73) has a flat, in particular strip-shaped, cut, preferably consisting of soft elastic material, in particular a rubber or rubber-like material.

7. Screening machine according to claim 5 or 6, characterized in thatthe sealing element (74) is materially connected, preferably glued, to the cover section (73).

8. Screening machine according to one of claims 1 to 7, characterized in that the cover (70) has an opening (78) which is at least partially aligned with the passage (62) of the side wall (60) and through which the screen tensioner (40) is guided, and that the sealing element (74) surrounds the opening (78) on its side facing the side wall (62) in a circumferential manner, preferably completely circumferentially.

9. Screening machine according to one of claims 1 to 8, characterized in thatthe screen tensioner (40) has a rod-like or profile-like tensioning section (41) which has a fastening section (46) in the region of its two longitudinal ends, that the tensioning section (41) has a first tensioning projection (42) in the region of a first tensioning side, which forms a first tensioning edge (42.1) and has a second tensioning projection (43) on an opposite second tensioning side, which forms a second tensioning edge (43.1), that the first tensioning edge (42.1) and the second tensioning edge (43.1) extend between the two fastening sections (46), that the first tensioning edge (42.1) forms a first and the second tensioning edge (43.1) forms a second tensioning contour and that the first and the second tensioning contours preferably have different geometries.

10. Screening machine according to one of claims 1 to 9, characterized in thatthe two longitudinal ends of the screen tensioner (40) each have a / the fastening section (46), that a tensioning device (50) with a tensioning piece (53) acts on the fastening section (46) in order to tension the screen lining (20) in the tensioning direction, and that the cover (70) is arranged in the area between the tensioning piece (53) and the side wall (61) of the screen box (60).

11. Screening machine according to claim 10, characterized in that two legs (51, 53) arranged at a distance from one another are connected to the clamping piece (52), and that the two legs (51, 53) and the clamping piece (52) delimit a receptacle (54) in which the fastening section (46) of the screen tensioner (40) is received.

12. Screening machine according to claim 11, characterized in thatthe legs (51, 53) are each equipped with a threaded receptacle (55), the central longitudinal axes of the threaded receptacles (55) running in the clamping direction, that a support bearing (56) with a holder (57) is fastened to the side wall (61), that the holder (57) has screw receptacles through which clamping screws (58) are passed and screwed into the threaded receptacles of the legs (51, 53), that two bearing pieces (56.1) are connected to the holder (57), which bearing pieces are fastened to the side wall (61) and arranged at a distance from one another, and that the holder (57) and the support bearings (56.1) delimit, at least in regions, a section of the side wall (61) within which the cover (70) is arranged.

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