Bulk material cleaner with integrated air separator, and bulk material cleaner with a hollow support frame

Abstract

Bulk material cleaner (1) comprising a support frame (2) and a screen housing (3), which can be oscillated and/or vibrated by a drive (5). At least one screen (6) is arranged in the screen housing (3). The screen housing has a feed opening (7) and at least two outlet openings (8, 9), the outlet openings (8, 9) being for a first fraction (F1) and a second fraction (F2), respectively. Moreover, the bulk material cleaner (1) comprises an air separator (10), which is only fastened on the screen housing (3).

Claims

1. A bulk material cleaning device comprising: a support frame, and a screen housing which is mounted on the support frame by spring elements in such a way that the screen housing can be set in oscillation and/or vibration by a drive, wherein at least one screen is arranged in the screen housing for separating bulk material into a first fraction and a second fraction, the screen housing having an inlet opening and at least two outlet openings, respectively, for the first fraction and the second fraction, and the bulk material cleaning device further comprises an air separator which is only attached to the screen housing so that the air separator can also be set into oscillation and/or vibration by the drive, wherein the air separator is a centrifugal separator which comprises a jacket having a rotationally symmetrical inner jacket surface and an inner element that is arranged coaxially thereto and has air passage openings, and the inner element extends over an entire length of the centrifugal separator.

2. The bulk material cleaning device according to claim 1, wherein the air separator is attached to an upper side of the screen housing.

3. The bulk material cleaning device according to claim 1, wherein the centrifugal separator comprises a tangential suction over an entire length of the centrifugal separator.

4. The bulk material cleaning device according to claim 3, wherein the tangential suction comprises at least one guide vane which is designed to generate a swirl of an air flow.

5. The bulk material cleaning device according to claim 1, wherein the air passage openings of the inner element are formed over an entire length of the inner element.

6. The bulk material cleaning device according to claim 1, wherein the inner jacket surface and the inner element are frustoconical.

7. The bulk material cleaning device according to claim 1, wherein the air passage openings are provided with guide elements which effect a deflection of the air flow.

8. The bulk material cleaning device according to claim 1, wherein the support frame is hollow and at least one outlet opening opens into the support frame.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is better described below with reference to a preferred embodiment in conjunction with the figures. It is shown:

(2) FIG. 1 a perspective sectional view through a bulk material cleaning device according to the invention;

(3) FIG. 2 a perspective detailed view in longitudinal section through an air separator of the bulk material cleaning device of FIG. 1;

(4) FIG. 3 a cross-sectional view through an air separator of the bulk material cleaning device of FIG. 1, and

(5) FIG. 4 a perspective view of a variant of the bulk material cleaning device according to the invention,

(6) FIG. 5 a detailed view of the bulk material cleaning device of FIG. 4, and

(7) FIG. 6 a schematic side view of a further bulk material cleaning device according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(8) FIG. 1 shows a bulk material cleaning device 1. The bulk material cleaning device 1 comprises a support frame 2, which carries a screen housing 3. The screen housing 3 is mounted on spring elements which are not visible and can be set into a vibrational motion by means of a drive which is not shown. A spring element 4 and the drive 5 are visible in FIG. 4.

(9) A screen 6 is arranged inside the screen housing. Bulk material is fed to the bulk material cleaning device 1 through the feed opening 7 and separated into a first fraction F1 and a second fraction F2, which leave the bulk material cleaning device 1 through the outlets 8 and 9.

(10) Two air separators 10 are arranged next to each other on an upper side 11 of the screen housing 3, which are shown separately in FIG. 3.

(11) The air separator 10 is formed as a cover of the bulk material cleaning device 1 and comprises a jacket 14 with a frustoconical inner jacket surface 15 with an opening angle φ. Inside the jacket 14 and coaxially therewith is an inner frustoconical element 16 extending along the entire length of the jacket 14. The longitudinal direction of the jacket 14 and the inner element 16 is defined by the longitudinal axis LA.

(12) The inner element 16 also has an opening angle φ so that an annular space 18 with a constant radial gap width is formed between the jacket surface 15 and the inner element 16.

(13) The top surface 19 of the jacket 14 is closed, while the base surface of the jacket 14 is only partially closed by a ring 20, exposing an opening 21 having the diameter of the base surface of the inner element 16.

(14) The inner element 16 is provided with air passage openings 17. The area of the jacket 14 facing the interior of the screen housing 3 serves as a tangential suction 12 and has a plurality of guide vanes 13.

(15) When the bulk material cleaning device 1 is operated, a negative pressure is generated at the opening 21 by a suction device 26 and/or a radial fan 29, which are only shown schematically in FIG. 1. Air in the interior of the screen housing 3 thus flows from below in the direction of the upper side 11, as shown schematically by the arrows 22, and entrains lighter particles.

(16) The guide vanes 13 cause a deflection of the air flow and create a swirl in the annular space 18, so that a vortex flow is created in the annular space 18, which is shown schematically by the arrow 23. The vortex flow separates the particles centrifugally from the air flow, and those are then either subjected to a further process via the line 26 or collected as waste.

(17) The purified air flow passes through the air passage openings 17, which are also provided with baffles that cause deflection of the air flow, and reaches the opening 21, as shown schematically by the arrow 25, where it is either directed to the outside or returned to the screen box.

(18) FIGS. 4 and 5 show a variant of the bulk material cleaning device 1 in which a spring element 4 and the drive 5 are visible. The bulk material cleaning device 1 is designed as described above, wherein, in contrast to the bulk material cleaning device 1 described above, the outlet openings 8 and 9 open into a cavity of the support frame 2, so that no external lines are necessary. This is shown schematically in FIG. 4, according to which two channels for the fractions F1 and F2 are formed in the support frame 2. In particular, a further device 24, which may be a bulk cleaning device 1, can be arranged above the bulk material cleaning device 1 without the need to provide additional lines.

(19) FIG. 6 schematically diagram shows a bulk material cleaning device 1.

(20) The bulk material cleaning device 1 comprises several treatment devices 27, 27′, 27″ and 27′″, which are mounted on a support frame 2. The mounting can be provided by means of spring elements as described above or directly, e.g. by means of screws or bolts.

(21) The treatment device 27, 27′, 27″ or 27′″ may be a drum screen, a sorting and classifying device, a stone sorting device, a light material separator, an aspiration channel/tarar, or a magnetic separator.

(22) Each treatment device 27, 27′, 27″ or 27′″ has at least one feed opening 7, 7′, 7″ or 7′″, respectively, and an outlet opening 8, 8′, 8″, 9″ or 8′″, respectively.

(23) Since the feed openings 7, 7′, 7″ and 7′″ and the discharge openings 8, 8′, 8″, 9″ and 8′″ are located in an area covered by the support frame 2, they are only indicated by an arrow.

(24) The support frame 2 is hollow. The outlet opening 8 of the treatment device 27 opens into the support frame 2. The support frame 2 in turn opens into the feed opening 7′ of the treatment device 27′, which is arranged downstream of the treatment device 27 in the product flow direction. A connecting line 28, which fluidically connects the outlet opening 8 with the feed opening 7′ and is shown schematically by the dashed line, is thus formed by the hollow support frame 2.

(25) Downstream of the treatment device 27′, a further treatment device 27″ is arranged on the support frame 2. Analogous to the example described above, the outlet opening 8′ of the treatment device 27′ and the feed opening 7″ of the treatment device 27″ are fluidically connected via a connecting line 28′, which is formed by a section of the hollow support frame 2.

(26) Downstream of the treatment device 27″, another treatment device 27″ is arranged on the support frame 2. In this case, the treatment device 27″ has two outlet openings 8″ and 9″ which open into the support frame 2, the hollow support frame 2 forming two parallel connecting lines 28″ and 28″. The connecting line 28″ connects the outlet opening 8″ of the treatment device 27″ to the feed opening 7′″ of the treatment device 27″. The outlet opening 9″ opens into the connecting line 28″. The connecting line 28′″ can, for example, serve as a waste line or lead to a further treatment device arranged downstream of the treatment device 27′″.

(27) It can thus be seen that, depending on the choice of the different treatment devices 27, 27′, 27″ and 27′″, the support frame 2 allows flexibility and modularity of the structure of the bulk material cleaning device 1.