CN215940717U - Feeding device - Google Patents

Abstract

The utility model discloses a feeding device, comprising: the feeding assembly comprises a feeding shell, and a feeding channel, a feeding slideway and a parabolic arc-shaped channel are formed in the feeding shell; the upper end of the feeding slide way is connected with the lower end of the feeding channel, one end of the parabolic arc-shaped channel is connected with the lower end of the feeding slide way, and the upper surface of the parabolic arc-shaped channel is a downward-concave arc-shaped surface; the bulk dust collection assembly comprises a bulk dust collection shell, a dust collection channel which is vertically arranged is formed in the bulk dust collection shell, an air port adjusting plate is arranged in the dust collection channel, the upper end of the air port adjusting plate is pivoted on the inner wall of the dust collection channel, the parabola direction of the parabola arc-shaped channel faces to the upper end face of the air port adjusting plate, and the parabola arc-shaped channel is used for guiding materials to be thrown to the upper end face of the air port adjusting plate in the downward sliding process; and the negative pressure dust suction device is connected with the upper end of the dust suction channel. The utility model has simple structure and good dust collection effect.

Description

Feeding device

Technical Field

The utility model relates to the technical field of material feeding, in particular to a feeding device.

Background

The color sorter utilizes the photoelectric detection technology to automatically sort out the heterochromatic particles in the particles according to the difference of the optical characteristics of the materials, and generally comprises a feeding device, a recognition device, a sorting device and a receiving device. When the material sorting device works, materials fall into the viewpoint of the recognition device from the feeding device, the recognition device completes recognition operation, then the sorting device sorts the materials according to recognition results, and the sorted materials fall into the material receiving device.

Before the material enters the feed hopper of the color sorter, if the treatment on light impurities such as dust or peel doped in the material is not clean, the light impurities such as peel can be suspended and stained with dust within the viewpoint range of the color sorter during sorting. Therefore, the identification of color selection is influenced, so that the identification is mistaken, the color selection quality is influenced, and the viewpoint is blurred and cannot be selected seriously.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the feeding device which is simple in structure, and is convenient for removing light impurities such as dust or material skin in materials entering the color sorter, so that the normal work of the color sorter is prevented from being influenced.

A feeding device according to an embodiment of the present invention includes:

the feeding assembly comprises a feeding shell, and a vertically arranged feeding channel, a feeding slide way and a parabolic arc-shaped way which are obliquely arranged relative to the horizontal direction are sequentially formed in the feeding shell from top to bottom; the upper end of the feeding slide way is connected with the lower end of the feeding channel, one end of the parabolic arc-shaped channel is connected with the lower end of the feeding slide way, and the upper surface of the parabolic arc-shaped channel is a downward-concave arc-shaped surface;

the bulk dust collection assembly comprises a bulk dust collection shell, a dust collection channel which is vertically arranged is formed in the bulk dust collection shell, an air port adjusting plate is arranged in the dust collection channel, the upper end of the air port adjusting plate is pivoted on the inner wall of the dust collection channel, the parabola direction of the parabola arc-shaped channel faces to the upper end face of the air port adjusting plate, and the parabola arc-shaped channel is used for guiding materials to be thrown to the upper end face of the air port adjusting plate in the downward sliding process;

and the negative pressure dust suction device is connected with the upper end of the dust suction channel.

According to the feeding device provided by the embodiment of the utility model, firstly, the fed materials are accelerated by the feeding channel and the feeding slide way, the accelerated materials are uniformly spread on the materials at the upper end surface of the corresponding air port adjusting plate by the parabolic arc-shaped channel, light impurities such as dust or peel and the like are separated from the materials in the uniform spreading process, the light impurities such as the dust or the peel and the like are upwards sucked out of the dust absorption channel by the suction force of the negative pressure dust absorption device, and the materials fall down along the dust absorption channel due to the heavier self weight, so that cleaner materials are obtained.

In some embodiments, the feeding assembly further comprises at least one material dispersing plate, and the at least one material dispersing plate is arranged in the feeding channel at intervals to disperse materials.

In some embodiments, the feeding device further comprises a material distribution assembly, the material distribution assembly comprises a bottom plate and at least one material distribution plate, the bottom plate is obliquely arranged relative to the horizontal direction, the at least one material distribution plate is arranged on the bottom plate at intervals to define material distribution channels, and the material distribution channels are communicated with the lower end of the dust suction channel.

In some embodiments, the material distributing assembly further comprises a cover plate, the cover plate is arranged on one side of at least one material distributing channel close to the dust suction channel, and the cover plate covers at least one part of the material distributing channel.

In some embodiments, each of the distribution channels has an inlet end, and the opening area of the inlet end of the distribution channel increases gradually from the middle to both sides in the arrangement direction of the plurality of distribution channels.

In some embodiments, an adjusting device is arranged on the bulk material dust collection housing, and the adjusting device is connected with the air opening adjusting plate and used for adjusting the opening and closing angle of the air opening adjusting plate.

In some embodiments, the tuyere adjusting plate is provided with an adjusting block, the adjusting block is provided with a threaded hole, an arc-shaped hole is formed in a corresponding position on the bulk material dust collection shell, the adjusting device comprises a limit screw, and the limit screw penetrates through the arc-shaped hole and then is in threaded connection with the threaded hole.

In some embodiments, the upper end of the dust suction channel is provided with a negative pressure air net.

In some embodiments, the feeder device further comprises a bracket on which the feeder housing is disposed.

In some embodiments, the lower end of the feeder housing is connected to the lower end of the bulk pick-up housing.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic cross-sectional view of a feeding device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a discrete structure of a feeding device according to an embodiment of the present invention;

FIG. 3 is a schematic view of the construction of a material dispensing assembly according to one embodiment of the present invention;

fig. 4 is a schematic perspective view of a feeding device according to an embodiment of the present invention.

Reference numerals: the device comprises a feeding assembly 1, a feeding shell 11, a feeding channel 111, a feeding slideway 112, a parabolic arc channel 113, a bulk material plate 12, a feeding hopper 13, a bulk material dust collection assembly 2, a bulk material dust collection shell 21, a dust collection channel 211, an air opening adjusting plate 212, an adjusting block 2121, a threaded hole 2122, an arc hole 213, a negative pressure dust collection device 3, a material distribution assembly 4, a bottom plate 41, a material distribution plate 42, a material distribution channel 43, a cover plate 44, a limiting screw 5 and a support 6.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

Next, a feeding device according to an embodiment of the present invention is described with reference to fig. 1 to 4. The feeding device provided by the embodiment of the utility model can be used for dedusting materials before sorting by the color sorter so as to reduce the dust content and impurity content of the materials during sorting.

In the following description of the present application, a case where the feeding device of the embodiment of the present invention is used in a color sorter is exemplified. Of course, it will be understood by those skilled in the art that the feeding device of the embodiment of the present invention may also be used in other apparatuses, not limited to color sorters, such as rice mills.

As shown in fig. 1, 2 and 4, an embodiment of the present invention is a feeding device, comprising: the device comprises a feeding assembly 1, a bulk material dust collection assembly 2 and a negative pressure dust collection device 3. Specifically, the feeding assembly 1 comprises a feeding shell 11, and a vertically arranged feeding channel 111, a feeding slide channel 112 and a parabolic arc channel 113 which are obliquely arranged relative to the horizontal direction are sequentially formed in the feeding shell 11 from top to bottom; the upper end of the feeding slide rail 112 is connected with the lower end of the feeding channel 111, one end of the parabolic arc-shaped channel 113 is connected with the lower end of the feeding slide rail 112, and the upper surface of the parabolic arc-shaped channel 113 is a downward-concave arc-shaped surface; the bulk dust collection assembly 2 comprises a bulk dust collection shell 21, a dust collection channel 211 which is vertically arranged is formed in the bulk dust collection shell 21, an air port adjusting plate 212 is arranged in the dust collection channel 211, the upper end of the air port adjusting plate 212 is pivoted on the inner wall of the dust collection channel 211, the parabola direction of the parabola-shaped arc channel 113 faces to the upper end face of the air port adjusting plate 212, and the parabola-shaped arc channel 113 is used for guiding materials to be thrown to the upper end face of the air port adjusting plate 212 in the downward sliding process; the negative pressure cleaner 3 is connected to the upper end of the dust suction passage 211.

Referring to fig. 1, 2 and 4, in the embodiment of the present invention, the feeding assembly 1 is used for feeding materials, and a vertically arranged feeding channel 111, a feeding chute 112 arranged obliquely relative to a horizontal direction, and a parabolic arc-shaped channel 113 are arranged in the feeding assembly 1, so that the materials can obtain a fast moving speed through the vertically arranged feeding channel 111 to facilitate fast feeding; then the materials enter a feeding slideway 112 which is obliquely arranged relative to the horizontal direction, the moving direction of the materials is changed under the support and the restraint of the feeding slideway 112 which is obliquely arranged relative to the horizontal direction, the materials continuously slide downwards in an accelerated manner and enter a parabolic arc-shaped channel 113, and the upper surface of the parabolic arc-shaped channel 113 is a downwards concave arc-shaped surface, so that the materials are quickly thrown outwards in the parabolic moving direction after entering the parabolic arc-shaped channel 113 at a certain speed; the dust collection assembly 2 of the embodiment of the utility model comprises a bulk material dust collection shell 21, a dust collection channel 211 which is vertically arranged is formed in the bulk material dust collection shell 21, an air opening adjusting plate 212 is arranged in the dust collection channel 211, the upper end of the air opening adjusting plate 212 is pivoted on the inner wall of the dust collection channel 211, and the parabola direction of the parabola-shaped arc channel 113 faces to the upper end surface of the air opening adjusting plate 212. The material thrown outwards then moves to the upper end face of the tuyere adjusting plate 212 to be uniformly spread, and light impurities such as dust or material skin mixed in the material are separated from the material in the uniform spreading process. Finally, the negative pressure dust suction device 3 arranged at the upper end of the dust suction channel 211 provides a negative pressure environment, so that light impurities such as dust or peels are sucked upwards out of the dust suction channel 211, and the materials fall along the dust suction channel 211 due to heavier dead weight to obtain cleaner materials.

In summary, in the embodiment of the present invention, the feeding channel 111 and the feeding chute 112 are firstly used to accelerate the fed material, the parabolic arc-shaped channel 113 is used to uniformly spread the accelerated material on the upper end surface of the corresponding air outlet adjusting plate 212, and light impurities such as dust or peel are separated from the material in the uniform spreading process, and then the suction force of the negative pressure dust suction device 3 is used to suck the light impurities such as dust or peel upwards out of the dust suction channel 211, and the material falls down along the dust suction channel 211 due to the heavier self weight, so as to obtain a cleaner material. The feeding device provided by the embodiment of the utility model is applied to the color sorter, so that the impurity content of materials in the process of identifying the materials by the color sorter can be reduced, the sorting effect can be improved, and the adverse effect of light impurities such as dust and material skins contained in the materials on equipment of the color sorter can be reduced.

Specifically, in one embodiment, the upper end of the air opening adjusting plate 212 may be pivotally connected to the inner wall of the dust suction passage 211 by a hinge.

In some embodiments, the feeding assembly 1 further comprises at least one bulk material plate 12, and the at least one bulk material plate 12 is spaced apart in the feeding channel 111 to break up the material. Referring to fig. 1, one scattering plate 12 is provided in the embodiment of the present invention, but two, three, etc. scattering plates 12 may be provided in other embodiments. The arrangement of the material scattering plate 12 can achieve the purpose of scattering the entering materials, so that the subsequent materials are more uniform when falling from the dust collection channel 211; meanwhile, the arrangement of the bulk material plate 12 can separate light impurities such as dust or peel in the material from the material, so that the falling material is cleaner, and the separated light impurities such as dust or peel are sucked away by the negative pressure dust suction device 3 through the feeding slideway 112 and the parabolic arc-shaped channel 113.

In some embodiments, the feeding device further includes a material distribution assembly 4, the material distribution assembly 4 includes a bottom plate 41 arranged obliquely with respect to the horizontal direction and at least one material distribution plate 42, the at least one material distribution plate 42 is provided on the bottom plate 41 at intervals to define material distribution channels 43, and the material distribution channels 43 are all communicated with the lower end of the dust suction channel 211. Referring to fig. 1 and 2, in the embodiment of the present invention, the distributing assembly 4 includes a bottom plate 41 and four distributing plates 42, which are arranged obliquely with respect to the horizontal direction, the four distributing plates 42 define five distributing channels 43 at intervals, and the distributing channels 43 are all communicated with the lower end of the dust collecting channel 211, so that in actual use, after materials impact on the upper end surface of the tuyere adjusting plate 212 and are evenly spread, the materials can evenly fall into the corresponding distributing channels 43. Therefore, each material distributing channel 43 in the material distributing assembly 4 can receive uniform materials, so that when the feeding device of the embodiment of the utility model is used for feeding materials to the color selector, each color selecting unit of the color selector can be fed uniformly, and the color selecting effect is further improved.

In some embodiments, referring to FIGS. 1 and 2, the feed assembly 4 further includes a cover plate 44, the cover plate 44 being disposed on a side of the at least one feed channel 43 adjacent the suction channel 211, the cover plate 44 covering at least a portion of the feed channel 43. In practical use, the material falling from the tuyere adjusting plate 212 is fast, and the part of the cover plate 44 covering the material distributing channel 43 can limit the material falling onto the bottom plate 41 and bounced, so that the material is prevented from jumping out of the material distributing assembly 4 to cause loss. Specifically, the cover plate 44 may cover all of the material dividing channels 43 on the side near the dust suction channel 211, as shown in fig. 2. Meanwhile, in the embodiment of the present invention, at least a portion of the dispensing channel 43 may be understood as a portion of the dispensing channel 43 or the entirety of the dispensing channel 43, that is, the cover plate 44 may cover a portion of the corresponding one of the dispensing channels 43 or the cover plate 44 may cover the entirety of the corresponding one of the dispensing channels 43 at this time.

In some embodiments, referring to fig. 3, each of the distribution channels 43 has an inlet end, and the opening area of the inlet end of the distribution channel 43 increases gradually from the middle to both sides in the arrangement direction of the plurality of distribution channels 43. The inventor has found through a large number of experiments that the materials after being bulk-distributed by the bulk-distributing plate 12, the tuyere adjusting plate 212 and the like are relatively uniform before entering the material-distributing channel 43, but the arrangement rules that the middle is slightly more and the two ends are slightly less still exist. Therefore, the opening area of the inlet end of the material distributing channel 43 from the middle to the two sides is gradually increased and can be matched with the flow of the material flowing to the material distributing channel 43, so that the flow of the material entering each material distributing channel 43 can be ensured to be equal, and the occurrence of uneven distribution of the material in each material distributing channel 43 is reduced.

In some embodiments, an adjusting device is disposed on the bulk material dust collecting housing 21, and the adjusting device is connected to the air opening adjusting plate 212 for adjusting the opening and closing angle of the air opening adjusting plate 212. The adjusting device is used for adjusting the opening and closing angle of the air port adjusting plate 212, the air port adjusting plate 212 can be adjusted to be located at a proper position according to the parabolic movement height and the distance of the material, the best effect is achieved, and the position ensures that the material accurately collides with the air port adjusting plate 212. Meanwhile, the air port adjusting plate 212 is located at a proper position to ensure that the lower end of the dust suction channel 211 has a proper opening size, so that the size of suction force can be adjusted under the condition that the power of the negative pressure dust suction device 3 is not changed (the suction force is large when the opening is small, and the suction force is small when the opening is large), when the material particles are heavy, such as peanuts, the opening at the lower end of the dust suction channel 211 can be adjusted to be small, and the suction force is convenient for dust collection; when the material particles are light, such as rice, the lower opening of the dust suction passage 211 can be enlarged, and the suction force is small to prevent the rice from being sucked into the vacuum cleaner 3. Therefore, the adjusting device is convenient for reasonably adjusting the angle of the air port adjusting plate 212 according to the material types, so that the bulk material dust collection assembly 2 reaches the optimal dust collection state and cannot cause material loss.

Specifically, in some embodiments, referring to fig. 2 and fig. 4, the air outlet adjusting plate 212 is provided with an adjusting block 2121, the adjusting block 2121 is provided with a threaded hole 2122, the bulk material dust suction housing 21 is provided with an arc-shaped hole 213 at a corresponding position, the adjusting device includes a limit screw 5, and the limit screw 5 penetrates through the arc-shaped hole 213 and is in threaded connection with the threaded hole 2122. In the embodiment of the utility model, because the upper end of the air port adjusting plate 212 is pivoted on the inner wall of the bulk material dust collection shell 21, the purpose of fixing or loosening the air port adjusting plate 212 can be achieved by screwing or unscrewing the limiting screw 5, and when the air port adjusting plate 212 is adjusted to a proper angle, the purpose of fixing is achieved by screwing the limiting screw 5; after the air port adjusting plate 212 is adjusted to a proper angle, the limit screw 5 is loosened, and the air port adjusting plate 212 and the sidewall of the bulk material dust suction housing 21 can move relatively, so that the angle can be adjusted conveniently. Therefore, the arrangement of the limit screw 5 is convenient for reasonably and easily adjusting the angle of the air port adjusting plate 212 according to the material types, so that the bulk material dust collection assembly 2 reaches the optimal dust collection state and cannot cause material loss.

Specifically, in some embodiments, the upper end of the dust suction channel 211 is provided with a negative pressure air net, and the negative pressure air net is arranged such that when the suction force is too large, large-particle materials cannot overflow from the negative pressure air net into the negative pressure dust suction device 3, and small-particle dust and light impurities can overflow from the negative pressure air net, thereby having the beneficial effect of avoiding material loss.

Specifically, in some embodiments, referring to fig. 1, 2 and 4, the feeding device further comprises a bracket 6, and the feeding housing 11 is disposed on the bracket 6. The bracket 6 can support the whole feeding device.

Specifically, in some embodiments, referring to fig. 1, 2 and 4, the lower end of the feeding housing 11 is connected to the lower end of the bulk material dust-collecting housing 21, so that the bulk material dust-collecting device is more stable and reliable to use.

Further, in some embodiments, referring to fig. 2 and 4, the side ends of the feeding housing 11 and the bulk material dust collecting housing 21 may be provided with observation windows to facilitate observation and cleaning of the insides of the feeding assembly 1 and the bulk material dust collecting assembly 2.

Further, in some embodiments, referring to fig. 2 and 4, the upper end of the feeding housing 11 may be further provided with a feed hopper 13, which facilitates the addition of material.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A feeding device, comprising:

the feeding assembly (1) comprises a feeding shell (11), wherein a vertically arranged feeding channel (111), a feeding slide way (112) and a parabolic arc-shaped channel (113) which are obliquely arranged relative to the horizontal direction are sequentially formed in the feeding shell (11) from top to bottom; the upper end of the feeding slide way (112) is connected with the lower end of the feeding channel (111), one end of the parabolic arc-shaped way (113) is connected with the lower end of the feeding slide way (112), and the upper surface of the parabolic arc-shaped way (113) is an arc-shaped surface which is concave downwards;

the bulk dust collection assembly (2) comprises a bulk dust collection shell (21), a dust collection channel (211) which is vertically arranged is formed in the bulk dust collection shell (21), an air port adjusting plate (212) is arranged in the dust collection channel (211), the upper end of the air port adjusting plate (212) is pivoted to the inner wall of the dust collection channel (211), the parabolic direction of the parabolic arc-shaped channel (113) faces the upper end face of the air port adjusting plate (212), and the parabolic arc-shaped channel (113) is used for guiding materials to be thrown to the upper end face of the air port adjusting plate (212) in the downward sliding process;

the negative pressure dust suction device (3), the negative pressure dust suction device (3) with the upper end of dust absorption passageway (211) is connected.

2. A feeding arrangement according to claim 1, c h a r a c t e r i z e d in that the feeding assembly (1) further comprises not less than one material scattering plate (12), the not less than one material scattering plate (12) being arranged at intervals in the feeding channel (111) for scattering material.

3. A feeding device according to claim 1, further comprising a material distributing assembly (4), wherein the material distributing assembly (4) comprises a bottom plate (41) and at least one material distributing plate (42), the bottom plate (41) is obliquely arranged relative to the horizontal direction, the at least one material distributing plate (42) is arranged on the bottom plate (41) at intervals to define a material distributing channel (43), and the material distributing channels (43) are communicated with the lower end of the dust suction channel (211).

4. A feeding arrangement according to claim 3, characterised in that the feed assembly (4) further comprises a cover plate (44), the cover plate (44) being provided on a side of at least one of the feed channels (43) adjacent to the suction channel (211), the cover plate (44) covering at least a part of the feed channel (43).

5. A feeding arrangement as claimed in claim 3, characterized in that each of the dividing channels (43) has an inlet end, and in the direction of the arrangement of the dividing channels (43), the opening area of the inlet end of the dividing channel (43) increases gradually from the middle to both sides.

6. The feeding device as claimed in claim 1, wherein an adjusting device is provided on the bulk material dust-absorbing housing (21), and the adjusting device is connected to the air port adjusting plate (212) for adjusting the opening and closing angle of the air port adjusting plate (212).

7. The feeding device according to claim 6, wherein the tuyere adjusting plate (212) is provided with an adjusting block (2121), the adjusting block (2121) is provided with a threaded hole (2122), the bulk material dust collection housing (21) is provided with an arc-shaped hole (213) at a corresponding position, the adjusting device comprises a limit screw (5), and the limit screw (5) penetrates through the arc-shaped hole (213) and is in threaded connection with the threaded hole (2122).

8. Feeding device according to claim 1, characterized in that the upper end of the suction channel (211) is provided with a negative pressure air grid.

9. A feeding device according to claim 1, characterized in that the feeding device further comprises a bracket (6), the feeding housing (11) being arranged on the bracket (6).

10. A feeding arrangement according to claim 1, characterised in that the lower end of the feeding housing (11) is connected to the lower end of the bulk dust collecting housing (21).

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