EP3917690B1 - Vibrating screening system, consisting of at least two screening machines arranged in a row - Google Patents

Description

The present invention relates to a vibrating screen system, consisting of at least two screening machines arranged in a row that can be made to oscillate, each screening machine having a screening material input end and a screening material discharge end, and each screening machine having a resilient bearing point in the area of its screening material input end and in the area of its screening material discharge end.

Screening machines per se have been known for decades and are in widespread use.

The document DE 85 12 051 U1 for example, shows a screening device with a vibrating support structure, which is supported on springs on the ground and has a vibration exciter. The support structure consists of two side panels connected by first cross members, which primarily perform a circular oscillation, and of second cross members, which are connected to the support structure via springs and which oscillate elliptically or in the longitudinal direction, and between each first and second cross member an elastic screen mat is located. The screening device can be set up at an incline so that a sufficient conveying speed and a corresponding dwell time of the screenings on the screen can be achieved.

The document DE 10 2012 206 347 A1 shows a screening device with a base frame that can be set in motion, which consists of two side walls connected by first cross beams, and with an additional frame that is connected to the base frame via spring elements, which is formed from two side beams arranged parallel to the side walls and connected by second cross beams, wherein in Seen longitudinally of the screening device first and second crossbeams alternate with one another, with flexible screen mats forming a screen surface being clamped between a respective first and second crossbeam and with the additional frame being divided into at least two additional frame sections in the longitudinal direction. It is further provided that the screening device, seen in its longitudinal direction, has at least two screening sections arranged one behind the other with a different orientation relative to the horizontal, that each screening section is assigned its own additional frame section and that each screening section, in addition to the different orientation relative to the horizontal, differs in at least one further screening parameter of differs from the other wire section(s). Here, too, it is a question of a uniform screening machine, in which only screening machine areas with different inclinations are provided.

It is also known from practice to arrange two or more conventional, independent, individually mounted screening machines one behind the other and to let the material to be screened run over the row of screening machines if the screening task to be solved makes this expedient or necessary.

A disadvantage of the known state of the art is that the individual screening machines and even more so row arrangements of several screening machines often have a very large overall length, which makes the transport of the screening machines or vibrating screen systems from the manufacturer to the place of use complex and expensive and which requires a lot of space at the place of use.

The object of the present invention is therefore to create a vibrating screen system of the type mentioned above which avoids the disadvantages mentioned and which in particular simplifies transport from the manufacturer to the place of use and which requires less space at the place of use.

The document DE 1201160 B discloses a vibrating screen installation according to the preamble of claim 1, it shows a screening train made up of several coupled two-mass vibrating screens, each of which consists of a base frame and a screen frame with a screen bottom. The screen frames are connected to crossbeams and the crossbeams are attached in the middle of the screen frame and can be moved by means of a plurality of surrounding storage springs in the two cheeks of the base frame to adjust the inclination of the screen frame to the horizontal, and the screen frames are also connected by means of coupling links can be connected to each other at different inclinations to the horizontal.

The solution to the problem is achieved according to the invention with a vibrating screen system of the type mentioned at the outset, which is characterized in that all bearing points of the last screening machine in the row of screening machines, seen in the direction of conveyance of the screenings to be screened, are supported on the substructure, that the ones in the area of the screenings feed end of the/each additional the bearing point provided for the screening machine is also supported on the subsurface and that the bearing point provided in the area of the screenings discharge end of the/each additional screening machine is not supported on the base (5) but in the area of the screenings feed end of the following screening machine in the screenings conveying direction.

Advantageously, the distance between the individual screening machines can be reduced in the vibrating screen system according to the invention and the size of the overall system can be reduced as a result. The total weight of the vibrating screen system is reduced and thus its energy efficiency is increased. In addition, only a reduced number of bearing points to the underground is required, which leads to less effort in the design and production of underground bearing foundations. Furthermore, the oscillating screening plant according to the invention has a reduced sensitivity of the individual screening machines to the load caused by the material to be screened, since the screening machines can transfer kinetic energy to one another. This is particularly advantageous when heavy screening material is unevenly distributed. Because the first screening machine in the series does not have to carry the load of a predecessor on the feed side, it has a higher conveying capacity, which benefits faster distribution of the screenings and reduces sensitivity to overload. Due to the fact that the last screening machine in the screening material conveying direction is not excited on the delivery side by the upstream neighboring screening machine, the last screening machine in the series has little amplitude at its screening material delivery end, so that there is a smaller distance when it is transferred to a subsequent next one component of a screened material treatment plant becomes possible.

In order to simplify the transfer of screenings from one screening machine to the next following screening machine, it is further provided that the screenings discharge end of screening machines lying in front of the last screening machine, viewed in the screening material conveying direction, is arranged above the screening material feed end of the following screening machine in the screening material conveying direction. Due to this arrangement, no additional means are usually required for transferring the material to be screened, which is a further contribution to a weight-saving design of the vibrating screen system. The step between the individual screening machines can be set and adjusted at different heights according to needs. In addition, the material to be screened is advantageously loosened during the transfer by falling over a certain distance and hitting the screening material feed area of the following screening machine.

If necessary, a screenings transfer chute can be arranged between the screenings discharge end of screening machines located in front of the last screening machine and the following screening machine in screenings conveying direction, or at the screenings discharge end of each screening machine. The screenings transfer chute can advantageously be short and therefore light.

The invention further proposes that all bearing points are each formed by a spring arrangement and that the spring arrangement of the bearing point provided in the area of the screenings discharge end of the/each additional screening machine and the spring arrangement of the bearing point provided in the area of the screenings discharge end of the following screening machine in the direction of conveyance of the screenings are arranged flush one above the other are. This achieves both a mechanically simple arrangement and favorable vibration properties.

Advantageously, there is the possibility that all the screening machines of the vibrating screen system are identical to one another, which allows a cost-effective modular design of the vibrating screen system with more or fewer screening machines, depending on requirements.

Alternatively, the screening machines of the oscillating screening plant can be designed differently from one another if the screening tasks to be processed with the oscillating screening plant require this or make this expedient. Here, too, a basic structure, i.e. an essential part, of the individual screening machines can still be designed in the same way, so that here too an economical modular production and construction can still be achieved.

In order to be able to easily assign different screening tasks to the individual screening machines within the vibrating screening plant, it is proposed that the screening machines of the vibrating screening plant be designed with screens with different mesh sizes from screening machine to screening machine and/or that blind zones and/or distribution cones and/or material flow divisions be attached to the screening machines are. For example, the screen mesh size can increase from screening machine to screening machine, viewed in the conveying direction of the screenings.

A further possibility for adapting the vibrating screen system to the material to be screened with changing properties is achieved in that each screening machine of the vibrating screen system is preferably assigned at least one vibrating drive of its own.

Finally, in a further embodiment of the vibrating screen system, it is proposed that each vibrating drive be individually adjustable and operable in terms of its speed and/or its vibration angle and/or its vibration amplitude and/or its phase angle and/or its vibration shape. This enables flexible, individual adaptation to different materials to be screened and screening tasks during operation of the vibrating screen system, and thus optimization of the screening result.

Figur 1

eine erste Schwingsiebanlage mit drei Siebmaschinen, in einer schematischen Seitenansicht, und

Figur 2

eine zweite Schwingsiebanlage mit drei Siebmaschinen, ebenfalls in einer schematischen Seitenansicht.

Exemplary embodiments of the invention are explained below with reference to a drawing. The figures of the drawing show:

figure 1

a first vibrating screen plant with three screening machines, in a schematic side view, and

figure 2

a second vibrating screen system with three screening machines, also in a schematic side view.

In the following description of the figures, the same parts in the various figures are always provided with the same reference numbers, so that not all reference numbers have to be explained again for each figure.

figure 1 shows a first vibrating screen 1 in a schematic side view. The vibrating screen 1 consists here of three arranged in series, using at least each of an associated oscillating drive 20, 30, 40 vibrating screening machines 2, 3, 4. The oscillating drives 20, 30, 40 are of a type known per se and z. B. executed with rotating unbalanced masses, as shown in the drawing. Each oscillating drive 20, 30, 40 can preferably be individually adjusted and operated in terms of its speed and/or its oscillation angle and/or its oscillation amplitude and/or its phase angle and/or its oscillation form in order to optimally adapt the vibrating screen system 1 to different screening materials and tasks be able.

Each screening machine 2, 3, 4 has an in figure 1 sieve material feed end 21, 31, 41 on the right and sieve material discharge end 24, 34, 44 on the left. Screened material can be conveyed over the vibrating screen system 1 in the screening material conveying direction 10 indicated by an arrow. The screening machines 2, 3, 4 each have at least one flat screen, not visible here, running perpendicular to the surface plane of the drawing, with a definable screen mesh width, through which, during operation of the vibrating screen system, those particles of the screening material that can fall through the screening mesh are screened out of the screening material will.

Furthermore, each screening machine 2, 3, 4 has a resilient bearing point 22, 25; 32, 35; 42, 45 on. All bearing points 22 , 25 of the last screening machine 2 in the row of screening machines 2 , 3 , 4 seen in the conveying direction 10 to be screened are supported on the substructure 5 . The bearing point 32 , 42 located in the area of the screenings feed end 31 , 41 of each additional screening machine 3 , 4 is also supported on the substructure 5 .

In each case, the bearing point 35, 45 provided in the area of the screenings discharge end 34, 44 of each additional screening machine 3, 4 is not supported on the substructure 5, but in the area of the screenings discharge end 21, 31 of the following screening machine 2, 3 in the screenings conveying direction 10.

All bearings 22, 25; 32, 35; 42, 45 are here each by a spring assembly 23, 26; 33, 36; 43, 46 formed. The spring arrangement 36, 46 of the bearing point 35, 45 provided in the area of the screening material discharge end 34, 44 of each additional screening machine 3, 4 and the spring arrangement 23, 33 of the screening machine 2, 3 provided bearing point 22, 32 aligned one above the other. The spring assemblies 23, 26; 33, 36; 43, 46 consist, for example, of steel or elastomer or air springs.

The sieve material delivery end 34 , 44 of the sieve machines 3 , 4 lying in front of the last sieve machine 2 seen in the sieve material conveying direction 10 is arranged above the sieve material delivery end 21 , 31 of the sieve machine 2 , 3 following in the sieve material conveying direction 10 . The step between the individual screening machines 2, 3, 4 can be adjusted according to needs by attaching the elements of the spring assemblies 36, 46 at different heights. The use of spring arrangements 36, 46 having a length adjustability is also possible for this purpose.

The angle of inclination of the screening machines 2, 3, 4 relative to the horizontal and the angle between the individual screening machines 2, 3, 4 can be changed by changing the height of the bearing points 22, 25; 32, 35; 42, 45 can be set and adjusted relative to the base 5 according to the needs.

All the screening machines 2, 3, 4 of the vibrating screening plant 1 can be designed to be identical to one another, which enables a simple modular design with a different number of screening machines as needed.

Alternatively, the screening machines 2, 3, 4 of the vibrating screen 1 can be designed differently from one another. For example, the screening machines 2, 3, 4 of the vibrating screening plant 1 can be designed with screens with different screen mesh sizes from screening machine 2, 3, 4 to screening machine 2, 3, 4 and/or the screening machines 2, 3, 4 can have blind zones and/or or distribution cones and/or material flow divisions can be provided, which are covered in the drawing and therefore not visible or which, since they are known per se, are not shown separately.

During operation of the vibrating screen plant 1, screenings are fed onto the screenings feeding end 41 of the figure 1 first, arranged on the right screening machine 4, z. B. by means of a conveyor belt. When the screenings are conveyed in the conveying direction 10 through the screens of the screening machine, portions of the screenings that are screened fall down and are caught and/or transported away by suitable devices that are not specifically shown here. At the screenings delivery end 24 of the last Screening machine 2 in the row is then given a screenings residue, consisting of larger screenings parts that do not fit through the screen mesh.

figure 2 shows a second vibrating screen 1 with three screening machines 2, 3, 4 arranged in a row, also in a schematic side view.

The vibrating screen plant 1 after figure 2 differs from the vibrating screen 1 described above figure 1 in that a screening material transfer chute 27, 37, 47 is arranged at the screening material discharge end 24, 34, 44 of all screening machines 2, 3, 4, which prevents screening material loss into the environment, particularly when light screening material is being processed.

In its remaining parts, the vibrating screen 1 corresponds to figure 2 according to the vibrating screen installation 1 described above figure 1 , whose description is therefore referred to.

Reference list:

sign designation 1 vibrating screen plant 10 conveying direction 2 last screening machine 20 Oscillating drive from 2 21 screenings feed end of 2 22 Storage point on 21 23 spring assembly at 22 24 screenings delivery end of 2 25 Storage point on 24 26 Spring assembly at 25 27 Transfer chute to 24 3 first additional screening machine 30 Oscillating drive from 3 31 screenings feed end of 3 32 Storage point on 31 33 spring assembly at 32 34 screenings delivery end of 3 35 Storage point at 34 36 spring assembly at 35 37 Transfer chute to 34 4 second additional screening machine 40 Oscillating drive from 4 41 Screened material feed end of 4 42 Storage point at 41 43 Spring assembly at 42 44 screenings delivery end of 4 45 Storage point at 44 46 spring assembly at 45 47 Transfer chute to 44 5 underground

Claims (9)

1. A vibrating screening system (1), consisting of at least two screening machines (2, 3, 4), which are arranged in a row and can be caused to vibrate, wherein each screening machine (2, 3, 4) has a screening material feed end (21, 31, 41) and a screening material discharge end (24, 34, 44) and wherein each screening machine (2, 3, 4) has one resilient support (22, 25; 32, 35; 42, 45) each in the area of the screening material feed end (21, 31, 41) and in the area of the screening material discharge end (24, 34, 44), wherein:

   all the supports (22, 25) of the screening machine (2) that is last in the row of the screening machines (2, 3, 4) in the screening material conveying direction (10) are supported on the base (5);

   the support (32, 42) provided in the area of the screening material feed end (31, 41) of the/each additional screening machine (3, 4) is likewise supported on the base (5);

   characterized in that

   the support (35, 45) provided in the area of the screening material discharge end (34, 44) of the/each additional screening machine (3, 4) is supported on the screening machine that follows in the screening material conveying direction (10) in the area of the screening material feed end (21, 31) of said screening machine (2, 3) that follows in the screening material conveying direction (10).
2. The vibrating screening system (1) according to claim 1, characterized in that the screening material discharge end (34, 44) of screening machines (3, 4) prior to the last screening machine (2) seen in the screening material conveying direction (10) is each arranged above the screening material feed end (21, 31) of said screening machine (2, 3) that follows in the screening material conveying direction (10).
3. The vibrating screening system (1) according to claims 1 or 2, characterized in that between the screening material discharge end (34, 44) of the screening machines (3, 4) prior to the last screening machine (2) seen in screening material conveying direction (10) and the screening machine (2, 3) that follows in the screening material conveying direction (10) or on the screening material discharge end (24, 34, 44) of each screening machine (2, 3, 4) one screening material transfer chute (27, 37, 47) is each arranged.
4. The vibrating screening system (1) according to one of claims 1 to 3, characterized in that all supports (22, 25; 32, 35; 42, 45) are each formed by a spring assembly (23, 26; 33, 36; 43, 46) and in that the spring assembly (36, 46) of the support (35, 45) of the/each additional screening machine (3, 4) provided in the area of the screening material discharge end (34, 44) and the spring assembly (23, 33) of the support (22, 32) of the screening machine (2, 3) that follows in the screening material conveying direction (10) provided in the area of the screening material feed end (21, 31) are arranged in superposed alignment.
5. The vibrating screening machine (1) according to one of claims 1 to 4, characterized in that all screening machines (2, 3, 4) of the vibrating screening machine (1) are configured identically among each other.
6. The vibrating screening machine (1) according to one of claims 1 to 4, characterized in that the screening machines (2, 3, 4) of the vibrating screening system (1) are configured differently from each other.
7. The vibrating screening system (1) according to claim 6, characterized in that the screening machines (2, 3, 4) of the vibrating screening system (1) are provided with screens having different screen mesh sizes from screening machine (2, 3, 4) to screening machine (2, 3, 4) and/or in that there are blind zones and/or distribution cones and/or material flow divisions provided on the screening machines (2, 3, 4).
8. The vibrating screening system (1) according to one of claims 1 to 7, characterized in that each screening machine (2, 3, 4) is assigned with at least one own vibratory drive (20, 30, 40).
9. The vibrating screening system (1) according to claim 8, characterized in that each vibratory drive (20, 30, 40) is individually adjustable and operable in its number of revolutions and/or its oscillation angle and/or its vibration amplitude and/or its phase angle and/or its vibration mode.

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