Vibrating sieve

Abstract

The invention relates to a device comprising a vibrating sieve (1) and a motor (4) for setting the vibrating sieve (1) in vibration, wherein the vibrating sieve (1) is secured to a rigid frame (2), wherein the motor (4) is rigidly secured to the frame (2) and sets the latter in vibration, wherein the angle between the plane of the vibrating sieve (1) and the mounting face (19) of the motor (4) lies in the range of from 30 to 60 degrees and / or the legs (3) of the device attach to the frame (2).

Description

[0001] Vibrating screen

[0002] The invention relates to a motorized vibrating screen.

[0003] A motorized vibrating screen is a device for separating material, with fine particles falling through the screen and larger components sliding down the inclined screen. The motor moves or vibrates the screen to assist this process.

[0004] State-of-the-art motorized vibrating screens are usually relatively large and heavy devices, featuring a sturdy frame and a frame suspended from this frame or decoupled by springs, to which the vibrating screen is attached. Such a structure is necessary to set the vibrating screen in vibration, but not the entire device.

[0005] Such a vibrating screen is known, for example, from DE1273309B.

[0006] The object underlying the invention is to create an improved, in particular small, compact motorized vibrating screen.

[0007] To solve the problem, many attempts were made and prototypes were developed, the difficulty being to create a small device whose vibrating screen could be set in vibration and at the same time had a stable stand on different surfaces.

[0008] To solve the problem, a vibrating screen according to claim 1 or 11 is proposed.

[0009] In one embodiment, a device is proposed, comprising a vibrating screen and a motor for causing the vibrating screen to vibrate, wherein the vibrating screen is fastened to a rigid frame, wherein the legs of the device are attached to the frame and the motor is rigidly connected to the frame and causes it to vibrate.

[0010] In one embodiment, a device is proposed, comprising a vibrating screen and a motor for setting the vibrating screen into vibration, wherein the vibrating screen is fastened to a rigid frame, wherein the motor is fastened to a mounting surface which is rigidly attached to the frame and the motor sets the frame into vibration, wherein the mounting surface of the motor is oblique to the plane of the vibrating screen, wherein the angle between the plane of the vibrating screen and the mounting surface of the motor is in the range of 30 to 60 degrees. Preferably, the angle is between 35 and 55 degrees, in particular between 40 and 50 degrees. In one embodiment, the angle is 45 degrees. The angle is included between the underside of the vibrating screen and the region of the mounting surface located below the vibrating screen.

[0011] Preferably, the features of both mentioned embodiments are implemented in one device.

[0012] The vibrating screen is preferably used for screening compost.

[0013] It is preferred that the frame comprises a rear wall, wherein behind the rear wall there is a mounting bracket, on the mounting surface of which the motor is located, wherein the mounting surface is inclined to the plane of the vibrating screen and inclined to the rear wall.

[0014] It is preferred that the motor be an unbalanced motor. The shaft of the unbalanced motor is preferably aligned parallel to the rear, upper edge of the vibrating screen. In other words, the shaft of the unbalanced motor is arranged along the wide side of the device. The unbalanced motor is preferably a double-shaft motor, with the two unbalanced weights preferably arranged symmetrically around the center of the device.

[0015] It is preferred that the frame comprises a frame-shaped base element on which the vibrating screen rests and is fastened.

[0016] It is preferred that side walls protrude on both sides of the outer longitudinal edges of the base element, which side walls are connected at the rear side of the base element by a rear wall which protrudes from the rear, outer edge of the base element.

[0017] It is preferred that a leg or a region projects downwards from each of the inner edges of the base element.

[0018] It is preferred that the frame is composed of four profile elements which together form the base element, wherein the profile elements are welded in their joint areas.

[0019] It is preferred that the device comprises four fastening elements for the legs, wherein the legs are pivotally mounted in the fastening elements.

[0020] It is preferred that each leg has a base which is an elastic element and has a downwardly tapered shape.

[0021] It is preferred that one pair of legs is located further outward than the other pair of legs, the inner pair of legs resting against the underside of the frame when folded, and the outer pair of legs being located next to the side walls of the frame when folded, with a stop angle protruding laterally from the frame, against which one of the two outer legs rests. It is preferred that the motor is attached to the mounting surface by fastening means in the form of screws or bolts, the plane of the vibrating screen crossing the plane of the mounting surface in the region between an upper and a lower fastening means.

[0022] The motorized vibrating screen in question differs from the state of the art in that the frame on which the vibrating screen is mounted is directly equipped with four legs. The vibrating screen is firmly connected to the frame, specifically by bolts. A motor is attached to the frame, which causes the frame and, via this, the vibrating screen to vibrate.

[0023] The direct attachment of the legs to the frame refers to the fact that the attachment point of the legs is on the frame and the frame is therefore not arranged on a second frame or another frame which has legs, as in the prior art mentioned at the beginning.

[0024] In one design, the legs can be rigidly connected to the frame, so that the frame's vibration is transmitted to the legs. In another design, a spring or damping element can be provided at the attachment point of each leg to reduce or prevent the transmission of vibration to the legs. Another design variant involves constructing a section of each leg, for example, the uppermost section or a middle section, from an elastic material or as a spring.

[0025] The device rests on its four legs on the ground. The vibrating screen is not mechanically decoupled from the frame. The frame is preferably not mechanically decoupled from the legs. The motor vibration is thus transmitted to the entire device, with elastic feet on the legs dampening the vibration relative to the ground. The elastic feet and their angled alignment relative to the ground ensure that the vibrating screen does not move, even on hard surfaces such as concrete.

[0026] The frame is preferably made up of several rigidly welded elements.

[0027] The frame comprises a rectangular, frame-shaped base element, which has a wall on the rear end and on both long sides, with each wall projecting upwards from the outer edge of the frame-shaped base element. The walls preferably project upwards at a right angle from the base element. The vibrating screen rests directly on the base element and is firmly connected to it, particularly by means of screws. If the vibrating screen cannot be replaced, it can also be welded, for example, spot-welded, to the frame.

[0028] The frame has a fastening element for each leg in each corner. The legs are preferably pivotally mounted in the fastening elements. If folding is not desired, the legs can be welded or firmly screwed to the frame or the fastening elements. However, folding the device is preferred.

[0029] Each leg is preferably a hollow tube, in particular a rectangular tube or a square tube.

[0030] Each leg preferably has a support base made of elastic material at its lower end. The support bases preferably have a cross-section that tapers downwards.

[0031] One pair of legs, preferably the front one, is preferably positioned further inward than the other pair. The inner pair preferably rests against the underside of the base element when folded. The outer pair preferably rests against a stop, which protrudes outward from each side wall of the frame, when folded.

[0032] The two front legs are preferably shorter than the rear legs and / or have a larger angle to the base element. This creates a gradient from the rear end to the front end of the vibrating screen. The angle between the inside of each leg and the ground, viewed from the side, is preferably less than 90 degrees.

[0033] An additional mounting bracket is preferably provided on the rear wall, to which a motor is attached. The angle between the vibrating screen and the motor mounting surface is preferably in the range of 30-60 degrees. The motor mounting surface is particularly preferably at an angle of 45 degrees to the vibrating screen. The mounting bracket is preferably welded to the frame.

[0034] The motor is preferably an external vibrator known from the state of the art (also referred to as a vibration motor or unbalance motor).

[0035] The vibrating screen is preferably a perforated sheet. The hole size is preferably in the range of 10-20 mm. The perforated sheet preferably has a thickness in the range of 1.5 mm to 2.5 mm, especially 2 mm. The vibrating screen is preferably a galvanized steel sheet. A perforated sheet is preferred over a grid because the flat sheet rests better on the frame and is easier to screw in place. The angle of inclination of the vibrating screen when installed level is preferably between 10 and 30 degrees, especially between 15 and 20 degrees.

[0036] The vibrating screen is preferably attached to the base element of the frame with three screws along each of the two long sides.

[0037] The base element forms a circumferential support surface for the vibrating screen and preferably has a large opening, in particular a rectangular opening, within this support surface. Preferably, no outer or longitudinal struts extend between the frame elements below the vibrating screen.

[0038] The invention is illustrated by a preferred embodiment variant shown in the drawings, which is not to be understood as limiting.

[0039] Fig. 1 : Shows a perspective view of a particularly preferred embodiment of the device.

[0040] Fig. 2: shows the particularly preferred embodiment of the device in side view.

[0041] Fig. 3 : Shows a section through the motor and its mounting location on the device.

[0042] Fig. 4: Shows the folded device using a slightly different design variant.

[0043] Fig. 5: Shows the particularly preferred structure of the frame of the device.

[0044] Figures 1-3 and 5 show the particularly preferred embodiment of the device. The device in Figure 4 differs from this only in that the upper legs 11 extend to the front end of the side walls 7. The other components are identical in both embodiments. The following description of the figures therefore applies to all Figures 1-5.

[0045] The present motorized vibrating device differs from the prior art in that the frame 2, on which the vibrating screen 1 is mounted, is directly provided with four legs 3. The vibrating screen 1 is firmly connected, in particular screwed, to the frame 2. A motor 4 is attached to the frame 2, which causes the frame 2 and, via it, the vibrating screen 1 to vibrate.

[0046] The frame 2 comprises a rectangular, frame-shaped base element 5, which has a rear wall 6 on the rear end face and a side wall 7 on each of the two long sides, with the respective wall 6, 7 projecting upwards at the outer edge of the frame-shaped base element 5. The walls 6, 7 preferably project upwards at a right angle from the base element 5. A downwardly and inwardly inclined region 8 can adjoin the inner edge of the base element 5 on the rear end face of the frame 2.

[0047] At the front end, the base element 5 is extended forward to form a slide plate 9 for material coming from the vibrating screen 1. The slide plate 9 is preferably a straight extension of the vibrating screen 1, i.e., with the same inclination.

[0048] On the front end of the frame 2, a downwardly and inwardly inclined region 20 can be connected to the inner edge of the base element 5. This region 20 can be seen in Fig. 5, which includes a side view of the front frame element.

[0049] On the inside of the two long sides of the base element 5, downward-directed legs 10 can protrude, preferably at right angles.

[0050] In the rear area of ​​the two side walls 7, there are preferably legs 11 that point diagonally outwards and upwards. The legs 11 can originate from the rear wall 6 and extend forward to approximately the middle of the side walls 7. At the front area of ​​the side walls 7, there are outwardly projecting stop angles 12 for the rear legs 3 of the device. The stop angles 12 can be integrally connected to the side walls 7, or welded or screwed to them. The stop angles 12 can be present at the upper end of fastening elements 13 of the front legs 3. The side walls 7 are designed to rise, in particular rise diagonally, starting from the base element 5 at the front end.

[0051] The fastening elements 13 of the four legs 3 are in the form of U-shaped profiles. The U-shaped profiles for the rear legs 3 are preferably formed by the side walls 7 and the rear wall 6 of the frame 2. The rear wall 6 projects outwards beyond the two side walls 7 and has a forward-projecting leg 14 at the outer end. The base 15 of each U-shaped profile forms a stop for a leg 3 in the unfolded state. The pivot axis of the respective leg 3 runs between the two legs of the U-shaped profile. The base 15 of the rear U-shaped profiles is preferably perpendicular to the plane of the base element 5. The angle on the inside, at the bottom, between the base 15 of the front U-shaped profiles and the plane of the base element 5 is preferably more than 90 degrees, in particular between 100 and 120 degrees, for example 110 degrees.

[0052] The preferred composition or manufacture of the frame 2 can be seen in Fig. 5. This is preferably composed of one element, in particular a sheet metal element, on each side of the rectangular frame 2. The frame 2 comprises a front frame element, which has the sliding plate 9 and the inwardly and downwardly inclined region 20, wherein a part of the sliding plate 9 forms the front side of the base element 5. Less preferably, the sliding plate 9 could have an angle or kink to the base element 5. The sliding plate 9 is preferably designed to taper towards the front. The frame 2 comprises a rear frame element, which comprises the back of the base element 5 and the rear wall 6, as well as the inwardly and downwardly inclined region 8. The base 15 and the leg 14 of the fastening element 13 are also preferably formed from the rear frame element.Less preferably, the fastening element 13 or the base 15 and the leg 14 can be present as a separate element and can be fastened, in particular welded, to the frame 2.

[0053] The mounting bracket 18 is attached, in particular welded, to the rear frame element. Preferably, a weld seam is located between the upper edge of the mounting bracket 18 and the rear wall 6. Preferably, a weld seam is located between the lower edge of the area 8 and the mounting surface 19. The mounting surface 19 preferably projects downwards beyond the area 8. The mounting surface 19 can be located on the outside at the corner area of ​​the base element 5 and the rear wall 6. Welding in this area is not necessary, but could be performed, in particular, at the respective side edge of the mounting surface 19.

[0054] The mounting bracket is preferably an L-shaped bracket which comprises an upper leg 21 and a lower leg 22, which lower leg 22 forms the mounting surface 19.

[0055] In Fig. 5, the mounting bracket 18 is also shown in a top view, where it can be seen that it has a central recess such that two through-openings 23 on the mounting surface 19 are accessible through the opening in the upper leg 21 of the mounting bracket 18. The recess preferably extends over a partial area of ​​the upper leg 21 and lower leg 22. Two further through-openings 23 are provided on the mounting surface 19 below the area 8. The motor 4 is fastened to the mounting surface 19 with bolts or screws and nuts, with the bolts or screws protruding through the through-openings 23.

[0056] The plane of the vibrating screen 1 crosses the plane of the mounting surface preferably in the area between the lower and upper through openings 23. In other words, the plane of the vibrating screen 1 crosses the plane of the mounting surface 19 in the area between an upper and a lower fastening means, in the form of screws or bolts.

[0057] The mounting surface 19 is located behind the rear end of the vibrating screen 1, with the mounting surface 19 being partially below the plane (straight extension of the vibrating screen in the direction of the mounting surface) of the vibrating screen 1 and partially above the plane of the vibrating screen 1. The frame 2 preferably comprises two lateral frame elements, each of which forms the lateral region of the base element 5 and also comprises the lower legs 10. The upper legs 11 can be part of the lateral frame elements or can be welded or screwed to them.

[0058] The frame elements are welded together at their joints. The four frame elements together form the flat base element 5, to which the vibrating screen 1 rests and is firmly bolted. The frame elements preferably have a material thickness in the range of 2-4 mm, particularly 3 mm.

[0059] The fastening element 13 (or parts of the fastening element 13) of the respective front leg 3 is preferably welded to the side frame element. The welded part preferably comprises a flat area 24, which rests on the outside of the side wall 7 and forms a leg of the U-profile in the lower area, below the base element 5. A region protrudes inwards from this lower area, which forms the base 15 of the U-profile. The second leg of the U-profile is preferably formed by the lower leg 10. The two legs of each fastening element 13 each have an opening, so that a bolt guided through the two openings forms the pivot axis for the legs 3. At the upper end of the flat area 24, the welded part preferably has the stop angle 12.

[0060] The fastening elements 13 and the axles arranged in the fastening elements 13 are preferably made of rigid material. Less preferably, these elements can be elastic or vibration-damping, or can have elastic or vibration-damping supports or coatings. For example, a vibration-damping element made of rubber or foam could be present in the U-profile between the fastening element 13 and the leg 3. In one embodiment, the respective leg 3 is preloaded against the base 15 of the U-profile.

[0061] In one embodiment, the respective joint between the frame 2 and a leg 3 is designed to be stiff, so that the vibration of the frame 2 does not cause any movement of the leg 3 around the joint. The leg 3 can be held in place, in particular, by a clamping effect or friction between the two legs of the respective fastening element 13.

[0062] Each leg 3 is preferably a hollow tube, in particular a rectangular tube or a square tube.

[0063] Each leg 3 has a base 16 made of elastic material at its lower end. The bases 16 preferably have a downwardly tapered cross-section. In particular, the bases 16 are conical, pyramid-shaped, or conical with flattened tips. The bases 16 can in particular be in the form of rubber buffers. The bases 16 can be in the form of parabolic rubber-metal buffers (parabolic springs), which are used according to the prior art as impact protection or impact damping. The bases 16 can be provided with threaded bolts and screwed into the legs 3. The height of the bases 16 is preferably between 20 and 65 mm, in particular between 25 and 40 mm. The diameter of the bases 16 is preferably between 20 and 50 mm, in particular between 25 and 40 mm. The Shore hardness is preferably in the range of 30-90°Shore A, in particular 40-70°Shore A, in particular 50 to 60°Shore A.

[0064] Magnets 17 can be attached to the legs 3 to hold them to the frame 2 when folded.

[0065] One pair of legs 3, preferably the front one, is preferably located further inward than the other pair. The inner pair preferably rests against the underside of the base element 5 when folded in. The outer pair preferably rests against a stop 12 when folded in, which protrudes outwards from a respective side wall 7 of the frame 2. The two inner legs 3 can be connected by a cross brace. The two front legs 3 are preferably shorter than the rear legs 3 and / or have a larger angle to the base element 5. This creates a gradient from the rear end to the front end of the vibrating screen 1. The angle, viewed from the side, between the inside of the respective leg 3 and the ground is preferably less than 90 degrees, in particular it is in the range of 75 to 85 degrees.

[0066] An additional mounting bracket 18 is preferably provided on the rear wall, to which a motor 4 is attached. The angle between the vibrating screen 1 and the mounting surface 19 of the motor 4 is preferably in the range of 30-60 degrees. The mounting surface 19 of the motor 4 is particularly preferably at an angle of 45 degrees to the vibrating screen 1. The mounting bracket 18 is preferably welded to the frame 2.

[0067] The motor 4 is preferably an external vibrator known in the art. An external vibrator is understood to be a motor 4 that does not have an outwardly projecting shaft, but rather, due to its inherent imbalance, transmits vibration or oscillation to the element to which the motor 4 is mounted. This preferably has a centrifugal force adjustment feature to adapt the vibrator to the vibrating screen 1. A sinusoidal centrifugal force is preferably generated by the rotation of unbalanced weights. The MVE 41 / 3E-MICRO-M motor from OLI SpA has proven suitable.

[0068] Motor 4 can be equipped with a power cable. Battery operation is also conceivable. io

[0069] The vibrating screen 1 is preferably a perforated sheet. The diameter of the holes is preferably in the range of 8-20 mm. The hole spacing (from center to center) is preferably in the range of 1.3 to 1.6 times the hole diameter, in particular in the range of 1.4-1.5 times. The device is preferably provided with two types of vibrating screens 1, which can be mounted on the frame 2 and which differ in hole diameter. One preferably has a hole diameter of 10 mm and the other of 15 mm.

[0070] The length of the vibrating screen 1 is preferably in the range of 650-750 mm, in particular in the range of 670 to 710 mm. The width of the vibrating screen 1 is preferably in the range of 350-450 mm, in particular in the range of 370 to 410 mm.

[0071] The perforated sheet preferably has a thickness in the range of 1 mm to 3 mm, in particular 1.5-2.5 mm, in particular 2 mm.

[0072] The vibrating screen 1 is preferably attached to the base element 5 with three screws each along each of its two long sides. A central screw may also be provided on the front end, with which the vibrating screen 1 is attached to the base element 5. Two outer screws are preferably provided on the rear side of the base element 5, on either side of the mounting bracket 18. The base element 5 preferably has an elongated hole for each screw, as can be seen in Fig. 5. Each screw is guided through a matching hole in the vibrating screen 1, which is designed as a perforated plate, and an elongated hole, and is tightened with a nut.

[0073] The legs 3 are preferably not telescopic legs, although the provision of such is not excluded.

[0074] The lateral distance between the legs 3 is preferably large enough to allow a wheelbarrow to be placed underneath the vibrating screen 1.

[0075] In Fig. 2, a front height of the device is indicated by a dimension line, with this distance from the ground to the front edge of the sliding plate preferably being 700-750 mm. A rear height of the device, which corresponds to the distance from the ground to the uppermost point of the upper legs 11, is preferably between 900 and 1000 mm. The distance shown between the rear and front legs is preferably between 800 and 1000 mm.

[0076] The width of the device shown in Fig. 4 is preferably between 400 and 500 mm. The folded length of the device shown in Fig. 4 (distance between the tips of the feet 16) is preferably between 900 and 1100 mm. The folded height of the device shown in Fig. 4 (distance between the lower edge of the motor 4 and the upper edge of the leg 11) is preferably between 150 and 200 mm.

Claims

Patent claims 1. Device comprising a vibrating screen (1) and a motor (4) for causing the vibrating screen (1) to vibrate, characterized in that the vibrating screen (1) is attached to a rigid frame (2), the legs (3) of the device being attached to the frame (2) and the motor (4) being rigidly attached to the frame (2) and causing it to vibrate.

2. Device according to claim 1, characterized in that the frame (2) comprises a rear wall (6), wherein behind the rear wall there is a mounting bracket (18), on the mounting surface (19) of which the motor (4) is located, wherein the mounting surface (19) is oblique to the plane of the vibrating screen (1) and oblique to the rear wall (6).

3. Device according to claim 1 or 2, characterized in that the motor (4) is an unbalance motor.

4. Device according to one of claims 1 to 3, characterized in that the frame (2) comprises a frame-shaped base element (5) on which the vibrating screen (1) rests and is fastened.

5. Device according to claim 4, characterized in that on both sides of the outer longitudinal edges of the base element (5) side walls (7) protrude upwards, which are connected at the rear side of the base element by a rear wall (6) which protrudes from the rear, outer edge of the base element (5).

6. Device according to one of claims 4 to 5, characterized in that a leg (10) or a region (8, 20) projects downwards from each of the inner edges of the base element (5).

7. Device according to one of claims 4 to 6, characterized in that the frame (2) is composed of four profile elements which together form the base element (5), the profile elements being welded in their butt areas.

8. Device according to one of claims 1 to 7, characterized in that it comprises four fastening elements (13) for the legs (3), wherein the legs (3) are pivotally mounted in the fastening elements (13). Device according to one of claims 1 to 8, characterized in that each leg (3) has a base (16) which is in the form of an elastic element and has a downwardly tapered shape. Device according to one of claims 1 to 9, characterized in that one pair of legs (3) is located further outwards than the other pair of legs (3), the inner pair of legs (3) resting against the underside of the frame (2) in the folded state and the outer pair of legs (3) being located next to the side walls (7) of the frame (2) in the folded state, a stop angle (12) protruding laterally from the frame (2), against which one of the two outer legs (3) rests.Device comprising a vibrating screen (1) and a motor (4) for causing the vibrating screen (1) to vibrate, characterized in that the vibrating screen (1) is fastened to a rigid frame (2), wherein the motor (4) is fastened to a mounting surface (19) which is rigidly present on the frame (2), wherein the motor (4) causes the frame to vibrate, wherein the mounting surface (19) of the motor (4) is oblique to the plane of the vibrating screen (1), wherein the angle between the plane of the vibrating screen (1) and the mounting surface (19) of the motor (4) is in the range of 30 to 60 degrees. Device according to claim 11, characterized in that the mounting surface (19) of the motor (4) is at an angle of 45 degrees to the vibrating screen (1). Device according to one of claims 11 or 12, characterized in that the frame (2) comprises a rear wall (6), wherein a mounting angle is arranged behind the rear wall. (18), on whose mounting surface (19) the motor (4) is located, wherein the mounting surface (19) is inclined to the plane of the vibrating screen (1) and inclined to the rear wall (6). Device according to one of claims 11 to 13, characterized in that the motor (4) is an unbalance motor. Device according to one of claims 11 to 14, characterized in that the motor (4) is fixed to the mounting surface by means of fastening means in the form of screws or bolts (19), wherein the plane of the vibrating screen (1) crosses the plane of the mounting surface (19) in the region between an upper and a lower fastening means.

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