Self-cleaning airflow screen

Abstract

The utility model relates to the technical field of powder screening equipment, in particular to a self-cleaning airflow screen which comprises a main shell and a feeding mechanism, the main shell is provided with a raw material bin, a fine material bin and a coarse material bin which are communicated in sequence, and the feeding mechanism is provided with a rotating shaft rotationally connected with the main shell. The rotating shaft sequentially penetrates through the raw material bin, the fine material bin and the coarse material bin, a wind wheel plate is connected to the rotating shaft located in the fine material bin, a screen is fixedly connected into the fine material bin, and the screen is annular and surrounds the outer side of the wind wheel plate. Communicated airflow channels are formed in the wind wheel plate and the rotating shaft respectively, an airflow inlet used for being connected with an external air source is formed in the end of the rotating shaft, a plurality of airflow outlets are formed in the side, facing the screen, of the wind wheel plate, and the airflow inlet and the airflow outlets are both communicated with the airflow channels. And the screen is cleaned by blowing, so that powder can be prevented from blocking the screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder screening equipment technical field more specifically, it relates to a self-cleaning airflow screen. BACKGROUND

[0002] In the PVC plastic pipe manufacturing industry, generally adopt powder as raw material to produce. Powder may mix impurities in the process of production, transportation and unpacking, and the impurities will affect the performance of the product. Therefore, the powder needs to be screened, and the fine powder and coarse powder in the powder are separated.

[0003] The existing powder screening device usually uses a screen to screen the powder, so that the powder passes through the screen, the fine powder in the powder can fall from the screen, and the coarse powder is separated. However, in the process of use, the screen is easy to be blocked by the powder, which leads to the failure of the screening of the powder. At this time, the screen needs to be removed for cleaning, which affects the production efficiency. Moreover, dust is easy to be produced when the screen is replaced and cleaned, which will affect the health of the workers after being inhaled into the human body. SUMMARY

[0004] The utility model discloses to overcome the above-mentioned prior art screening device powder easy to block the screen problem, provide a self-cleaning airflow screen, can the screen is cleaned, prevent the screen from being blocked.

[0005] To solve the above technical problems, the utility model adopts the technical scheme: a self-cleaning airflow screen, including main casing and feeding mechanism, the main casing has the raw material warehouse, fine material warehouse and coarse material warehouse that communicate successively, the feeding mechanism has the rotation axis that is connected with the main casing rotates, and the rotation axis passes through the raw material warehouse, fine material warehouse and coarse material warehouse successively, is connected with the wind wheel board on the rotation axis in the fine material warehouse, the screen is fixedly connected in the fine material warehouse, the screen is annular and surrounds the wind wheel board outside, the wind wheel board and the inner part of the rotation axis are respectively provided with the airflow channel that links and communicates, the end of the rotation axis is equipped with the airflow inlet for connecting external gas source, the side of the wind wheel board towards the screen is equipped with a plurality of airflow outlets, the airflow inlet and the airflow outlet all with the airflow channel link and communicate.

[0006] In the technical scheme of the utility model, the powder is screened through the raw material warehouse, fine material warehouse and coarse material warehouse by the feeding mechanism. The powder is screened in the fine material warehouse by the screen, and the remaining coarse powder enters the coarse material warehouse. Because the airflow channel is connected in the rotation axis and the wind wheel board, the external airflow can enter the airflow channel from the airflow inlet and blow out from the airflow outlet, so as to clean the screen, which can avoid the powder from blocking the screen.

[0007] Further, the inside of the screen forms a material conveying channel extending along the length direction of the rotating shaft, one end of the material conveying channel is connected with the outlet of the raw material bin, and the other end of the material conveying channel is connected with the inlet of the coarse material bin.

[0008] In the scheme, the powder can enter the coarse material bin from the raw material bin through the material conveying channel, and the fine material is separated from the screen and enters the coarse material bin.

[0009] Further, the wind wheel plate extends along the axial direction of the rotating shaft and is provided with a plurality of wind wheel plates along the circumferential direction of the rotating shaft.

[0010] In the scheme, by providing a plurality of wind wheel plates extending along the radial direction along the circumferential direction, the efficiency of screen cleaning can be improved.

[0011] Further, a support rod is arranged between the wind wheel plate and the rotating shaft, one end of the support rod is connected with the wind wheel plate, and the other end of the support rod is connected with the rotating shaft.

[0012] In the scheme, the support rod serves as a transition connection to make the wind wheel plate close to the screen.

[0013] Further, the airflow channel includes a main flow channel, a first branch flow channel and a second branch flow channel connected in sequence, the main flow channel is arranged in the rotating shaft along the axial direction, the first branch flow channel is arranged in the support rod along the axial direction, and the second branch flow channel is arranged in the wind wheel plate along the length direction of the wind wheel plate.

[0014] In the scheme, the external airflow is guided to the screen for cleaning through the main flow channel, the first branch flow channel and the second branch flow channel connected in sequence.

[0015] Further, the airflow inlet is arranged at one end of the rotating shaft and is connected with a pneumatic rotary joint.

[0016] In the scheme, the pneumatic rotary joint is used to connect the external air source.

[0017] Further, the feeding mechanism further includes a driving motor and a spiral winch, the fixed end of the driving motor is fixedly connected with the main shell, the output shaft of the driving motor is in transmission connection with the rotating shaft, and the spiral winch is coaxially fixedly connected with the rotating shaft and located in the raw material bin.

[0018] In the scheme, the driving motor drives the rotating shaft to rotate, and drives the spiral winch to rotate, so as to push the powder from the raw material bin into the fine material bin.

[0019] Further, the top of the raw material bin is provided with a feeding port, the bottom of the fine material bin is provided with a fine material outlet, and the bottom of the coarse material bin is provided with a coarse material outlet.

[0020] In the scheme, the powder is put in through the feeding port, the fine material is separated through the fine material outlet, and the coarse material is separated through the coarse material outlet.

[0021] Further, the rotating shaft is coaxially fixedly connected with a baffle disc, the baffle disc is located between the fine material bin and the coarse material bin, and a gap is formed between the circumferential direction of the baffle disc and the fine material bin and the coarse material bin.

[0022] In the scheme, the baffle disc can block most of the fine material from entering the coarse material bin, and the gap can allow the coarse material to pass through without being blocked.

[0023] Further, the main shell is connected with an air breather, and the air breather is in communication with the fine material bin.

[0024] In the scheme, the air breather allows the fine material bin to communicate with the external air, and the excess air inside is discharged to balance the air pressure.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] First, the self-cleaning airflow screen of the utility model, since the airflow channels are connected in the rotating shaft and the wind wheel plate, the external airflow can enter the airflow channel from the airflow inlet and blow out from the airflow outlet, thereby cleaning the screen mesh, and the powder can be prevented from blocking the screen mesh.

[0027] Second, the baffle disc is arranged between the fine material bin and the coarse material bin, and the baffle disc can block most of the fine material from entering the coarse material bin. At the same time, a gap is formed between the circumferential direction of the baffle disc and the fine material bin, and the coarse material can pass through the gap, so the coarse material will not be blocked from entering the coarse material bin.

[0028] Third, the air breather is arranged on the main shell and communicates with the fine material bin, and the air breather allows the fine material bin to communicate with the external air, thereby discharging the excess air inside to balance the air pressure. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the overall structure schematic view of the self-cleaning airflow screen of the utility model;

[0030] Figure 2 is Figure 1 is the vertical direction sectional view;

[0031] Figure 3 is the structure schematic view of the feeding mechanism after the driving motor is omitted;

[0032] Figure 4 is the radial sectional view of the wind wheel plate position along the airflow outlet.

[0033] In the drawings: 1, main shell; 11, raw material bin; 111, feeding port; 112, electric butterfly valve; 12, fine material bin; 121, fine material outlet; 13, coarse material bin; 131, coarse material outlet; 132, end cover; 14, observation window; 2, feeding mechanism; 21, rotating shaft; 211, air inlet; 212, main flow channel; 22, wind wheel plate; 221, air outlet; 222, second branch flow channel; 23, support rod; 231, first branch flow channel; 24, driving motor; 25, spiral winch; 26, baffle disc; 261, gap; 3, screen mesh; 31, material conveying channel; 4, pneumatic rotary joint; 5, air respirator; 6, protective cover; 7, pulley transmission assembly; 71, driving pulley; 72, driven pulley; 73, transmission belt; 8, bearing seat; 9, discharging sensor. DETAILED DESCRIPTION

[0034] The drawings are only used for illustrative description, and should not be understood as limiting the patent; in order to better illustrate the embodiment, some components in the drawings can be omitted, enlarged or reduced, and do not represent the actual product size; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted. The positional relationship described in the drawings is only used for illustrative description, and should not be understood as limiting the patent.

[0035] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element indicated must have a specific orientation, a specific orientation and operation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description, and should not be understood as limiting the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0036] The technical scheme of the utility model will be further described in detail below through specific embodiments and in conjunction with the drawings:

[0037] Embodiment 1

[0038] Reference Figures 1 to 4The embodiment discloses a self-cleaning airflow screen, which comprises a main shell 1 and a feeding mechanism 2, the main shell 1 is provided with a raw material bin 11, a fine material bin 12 and a coarse material bin 13 which are sequentially communicated, the feeding mechanism 2 is provided with a rotating shaft 21 which is rotationally connected with the main shell 1 and sequentially penetrates through the raw material bin 11, the fine material bin 12 and the coarse material bin 13, a wind wheel plate 22 is connected with the rotating shaft 21 in the fine material bin 12, a screen 3 is fixedly connected in the fine material bin 12, the screen 3 is annular and surrounds the outer side of the wind wheel plate 22, the wind wheel plate 22 and the inner part of the rotating shaft 21 are respectively provided with airflow channels which are communicated, the end of the rotating shaft 21 is provided with an airflow inlet 211 which is used for connecting an external air source, a plurality of airflow outlets 221 are arranged on the side of the wind wheel plate 22 which faces the screen 3, and the airflow inlet 211 and the airflow outlets 221 are communicated with the airflow channels.

[0039] In the embodiment, the powder material is sequentially screened through the raw material bin 11, the fine material bin 12 and the coarse material bin 13 by the feeding mechanism 2. The fine material is separated from the powder material in the fine material bin 12 by the screen 3, and the remaining coarse material enters the coarse material bin 13. Since the airflow channels which are communicated are arranged in the rotating shaft 21 and the wind wheel plate 22, the external airflow can enter the airflow channels from the airflow inlet 211 and blow out from the airflow outlets 221, so that the screen 3 is cleaned, and the powder material can be prevented from blocking the screen 3.

[0040] Reference Figure 1 Specifically, the bottom of the main shell 1 is provided with four supporting legs which are used for supporting the main shell 1 on the ground. Taking the direction shown in the figure as an example, the inside of the main shell 1 is sequentially provided with the raw material bin 11, the fine material bin 12 and the coarse material bin 13 from right to left, wherein the bins can be assembled and fixed to form the main shell 1. The top of the raw material bin 11 is provided with a feeding port 111, through which the external powder material is fed into the raw material bin 11. An electric butterfly valve 112 is arranged at the feeding port 111 and is used for controlling the opening and closing of the feeding port 111. An observation window 14 is further arranged on the main shell 1 and is used for observing the running condition in the fine material bin 12.

[0041] In the embodiment, the inside of the screen is formed with a material conveying channel which extends along the length direction of the rotating shaft, one end of the material conveying channel is connected with the outlet of the raw material bin, and the other end of the material conveying channel is connected with the inlet of the coarse material bin.

[0042] Specifically, the screen 3 is annular and is fixedly connected to the inner upper side of the fine material bin 12, and a channel for the powder material to pass through is formed in the screen 3. The powder material enters the fine material bin 12 from the raw material bin 11, firstly enters the channel formed by the screen 3, and the fine material in the powder material is separated from the screen 3 under the gravity of the powder material and the agitation of the wind wheel plate 22 and falls into the bottom of the fine material bin 12. The coarse material in the powder material is continuously pushed to the left and falls into the coarse material bin 13 on the left, so that the separation of the coarse material and the fine material is completed.

[0043] In use, the powder can block the holes of the screen 3, affecting the screening effect. Therefore, the screen 3 needs to be cleaned to remove the powder blocking the screen 3. In this embodiment, a gas flow passage is formed in the rotating shaft 21 and the inside of the wind wheel plate 22 to introduce high-pressure external gas flow into the fine material bin 12. The high-pressure gas flow is blown out through the gas flow inlet 211 on the wind wheel plate 22, thereby removing the powder blocking the holes of the screen 3.

[0044] The wind wheel plate 22 extends along the axial direction of the rotating shaft 21 and is circumferentially arranged along the rotating shaft 21. By circumferentially arranging a plurality of radially extending wind wheel plates 22, the efficiency of cleaning the screen 3 can be improved.

[0045] A support rod 23 is arranged between the wind wheel plate 22 and the rotating shaft 21, one end of the support rod 23 is connected to the wind wheel plate 22, and the other end of the support rod 23 is connected to the rotating shaft 21. The support rod 23 serves as a transition connection to allow the wind wheel plate 22 to be arranged close to the screen 3.

[0046] Reference Figure 3 Specifically, the wind wheel plate 22 can be arranged four, evenly arranged along the circumferential direction of the rotating shaft 21. The wind wheel plate 22 and the rotating shaft 21 are connected by the support rod 23, for example, three support rods 23 are arranged along the length direction of the wind wheel plate 22, and each support rod 23 extends along the radial direction of the rotating shaft 21. By arranging the support rod 23, a larger stirring space can be provided for the powder, and the support rod 23 can assist in stirring the powder. At the same time, without increasing the width of the wind wheel plate 22, the wind wheel plate 22 can be arranged closer to the screen 3 by arranging the support rod 23, thereby improving the cleaning effect of the gas blowing.

[0047] In other embodiments, the wind wheel plate 22 can also be directly connected to the rotating shaft 21.

[0048] Reference Figure 2 and Figure 4 The gas flow passage includes a main flow passage 212, a first branch flow passage 231, and a second branch flow passage 222 connected in sequence. The main flow passage 212 is arranged in the rotating shaft 21 along the axial direction, the first branch flow passage 231 is arranged in the support rod 23 along the axial direction, and the second branch flow passage 222 is arranged in the wind wheel plate 22 along the length direction of the wind wheel plate 22. By sequentially connecting the main flow passage 212, the first branch flow passage 231, and the second branch flow passage 222, the external gas flow is guided to the screen 3 for cleaning.

[0049] Specifically, the main flow channel 212 is arranged along the central axis direction of the rotating shaft 21. One end of the main flow channel 212 is in communication with the air flow inlet 211 arranged at the end of the rotating shaft 21, and the other end of the main flow channel 212 does not penetrate the rotating shaft 21. The pneumatic rotary joint 4 is connected to one end of the rotating shaft 21, and is in communication with the air flow inlet 211 and used for connecting an external air source device. The pneumatic rotary joint 4 is a transition connection sealing device for inputting a gas medium from a static system to a dynamic rotating system. By connecting the pneumatic rotary joint 4, the rotating shaft 21 can be supplied with air without affecting the rotation of the rotating shaft 21.

[0050] With reference to Figure 2 and Figure 3 The air flow outlet 221 is arranged at the side edge of the wind wheel plate 22 and in communication with the second branch flow channel 222. A plurality of air flow outlets 221 are arranged along the side edge of the wind wheel plate 22, and each air flow outlet 221 is arranged to face the screen 3. The air flow outlet 221 arranged at the side edge of the wind wheel plate 22 can be close to the screen 3 to blow air, so as to clean the screen 3. Since the air flow outlet 221 is arranged in the wind wheel plate 22, compared with the air flow delivered through an external pipeline, the air flow channel of the embodiment has better stability.

[0051] Embodiment 2

[0052] With reference to Figures 1 to 4 The embodiment is similar to the embodiment 1, and the difference lies in that, in the embodiment, the feeding mechanism 2 further comprises a driving motor 24 and a spiral winch 25. The fixed end of the driving motor 24 is fixedly connected with the main housing 1, the output shaft of the driving motor 24 is in transmission connection with the rotating shaft 21, and the spiral winch 25 is coaxially fixedly connected with the rotating shaft 21 and located in the raw material bin 11. The driving motor 24 drives the rotating shaft 21 to rotate, thereby driving the spiral winch 25 to rotate, so as to push the powder from the raw material bin 11 into the fine material bin 12.

[0053] Specifically, the outer side of the raw material bin 11 is further fixedly connected with a protective cover 6, the fixed end of the driving motor 24 is fixedly connected with the protective cover 6, and the output shaft of the driving motor 24 is indirectly connected with the rotating shaft 21 through a belt transmission assembly 7. The belt transmission assembly 7 comprises a driving belt pulley 71, a driven belt pulley 72 and a transmission belt 73, wherein the driving belt pulley 71 is coaxially connected with the output shaft of the motor, the driven belt pulley 72 is coaxially connected with the rotating shaft 21, and the transmission belt 73 is sleeved on the driving belt pulley 71 and the driven belt pulley 72. The protective cover 6 can not only serve as a mounting place for the driving motor 24, but also serve as a protective function for the internal parts. By selecting the diameter ratio of the driven belt pulley 72 and the driving belt pulley 71, a suitable transmission ratio can be obtained.

[0054] In other embodiments, the output shaft of the motor can also be connected with the rotating shaft 21 through a shaft coupling, without the need of an intermediate transmission assembly.

[0055] Referring to Figure 1 and Figure 2 A bearing seat 8 is fixedly connected inside the protective cover 6 and outside the coarse material bin 13, and the rotating shaft 21 is rotatably connected with the bearing seat 8 through a bearing. Taking the direction shown in the figure as an example, the left side of the coarse material bin 13 is an end cover 132, and the end cover 132 is fixedly connected with a bearing seat 8. The inside of the protective cover 6 is provided with a bearing seat 8 on the side connected with the raw material bin 11, and the rotating shaft 21 is rotatably installed through the bearing seats 8 on both sides.

[0056] Referring to Figure 1 and Figure 2 The top of the raw material bin 11 is provided with an inlet 111, the bottom of the fine material bin 12 is provided with a fine material outlet 121, and the bottom of the coarse material bin 13 is provided with a coarse material outlet 131. The fine material obtained after being screened by the screen 3 inside the fine material bin 12 is collected at the bottom of the fine material bin 12, and can be discharged through the fine material outlet 121 at the bottom of the fine material bin 12. The coarse material remaining after screening is collected at the bottom of the coarse material bin 13, and can be discharged through the coarse material outlet 131 at the bottom of the coarse material bin 13. The fine material outlet 121 and the coarse material outlet 131 can each be provided with a material discharge sensor 9 for detecting the falling of the material, and can also be provided with a valve for controlling opening and closing.

[0057] Embodiment 3

[0058] Referring to Figure 1 and Figure 4 This embodiment is similar to embodiment 1 or embodiment 2, and the difference is that the rotating shaft 21 is coaxially fixedly connected with a baffle disc 26, the baffle disc 26 is located between the fine material bin 12 and the coarse material bin 13, and the circumferential direction of the baffle disc 26 has a gap 261 with the fine material bin 12 and the coarse material bin. Through the baffle disc 26, most of the fine material floating can be blocked from entering the coarse material bin 13, and at the same time the gap 261 can allow the coarse material to pass through without being blocked.

[0059] Specifically, the connection between the coarse material bin 13 and the fine material bin 12 is a circular opening, and the baffle disc 26 is located at the circular opening. The diameter of the baffle disc 26 is smaller than the diameter of the circular opening, so that an annular gap 261 is formed between the circumferential direction of the baffle disc 26 and the circular opening. Most of the fine material floating can be blocked by the baffle disc 26, so it will not enter the coarse material bin 13. The coarse material after being screened can enter the coarse material bin 13 along the gap 261 and will not be blocked.

[0060] The main housing 1 is connected with an air breather 5, and the air breather 5 is in communication with the fine material bin 12. The air breather 5 is provided with two, which are located on both sides of the top of the fine material bin 12. Since air is blown to the screen 3 through an external air source, the air pressure in the fine material bin 12 will gradually increase. The air breather 5 can balance the air pressure in the fine material bin 12 to ensure safe and stable air pressure.

[0061] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation manners of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to exhaust all the implementation manners. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A self-cleaning air flow screen characterized by: The application relates to a material feeding device, which comprises a main shell (1) and a feeding mechanism (2), the main shell (1) has a raw material bin (11), a fine material bin (12) and a coarse material bin (13) which are sequentially communicated, the feeding mechanism (2) has a rotating shaft (21) which is rotationally connected with the main shell (1), the rotating shaft (21) sequentially penetrates the raw material bin (11), the fine material bin (12) and the coarse material bin (13), a wind wheel plate (22) is connected with the rotating shaft (21) located in the fine material bin (12), a screen (3) is fixedly connected in the fine material bin (12), the screen (3) is annular and surrounds the outer side of the wind wheel plate (22), the wind wheel plate (22) and the inner part of the rotating shaft (21) are respectively provided with airflow channels which are communicated, the end of the rotating shaft (21) is provided with an airflow inlet (211) for connecting an external air source, the side of the wind wheel plate (22) which faces the screen (3) is provided with a plurality of airflow outlets (221), the airflow inlet (211) and the airflow outlet (221) are communicated with the airflow channels.

2. The self-cleaning airflow screen of claim 1, wherein: The inside of the screen (3) forms a material conveying channel (31) which extends along the length direction of the rotating shaft (21), one end of the material conveying channel (31) is connected with the outlet of the raw material bin (11), the other end of the material conveying channel (31) is connected with the inlet of the coarse material bin (13).

3. The self-cleaning airflow screen of claim 2, wherein: The wind wheel plate (22) extends along the axial direction of the rotating shaft (21) and is provided with a plurality of wind wheel plates (22) along the circumferential direction of the rotating shaft (21).

4. The self-cleaning airflow screen of claim 3, wherein: A hollow support rod (23) is arranged between the wind wheel plate (22) and the rotating shaft (21), one end of the support rod (23) is communicated with the wind wheel plate (22), the other end of the support rod (23) is communicated with the rotating shaft (21).

5. The self-cleaning airflow screen of claim 4, wherein: The airflow channel comprises a main flow channel (212), a first branch flow channel (231) and a second branch flow channel (222) which are communicated, the main flow channel (212) is arranged in the rotating shaft (21) along the axial direction, the first branch flow channel (231) is arranged in the support rod (23) along the axial direction, and the second branch flow channel (222) is arranged in the wind wheel plate (22) along the length direction of the wind wheel plate (22).

6. The self-cleaning airflow screen of claim 1, wherein: The airflow inlet (211) is arranged at one end of the rotating shaft (21) and is connected with a pneumatic rotary joint (4).

7. The self-cleaning airflow screen of claim 1, wherein: The feeding mechanism (2) further comprises a driving motor (24) and a spiral winch (25), the fixed end of the driving motor (24) is fixedly connected with the main shell (1), the output shaft of the driving motor (24) is drivingly connected with the rotating shaft (21), and the spiral winch (25) is coaxially fixedly connected with the rotating shaft (21) and located in the raw material bin (11).

8. The self-cleaning airflow screen of claim 1, wherein: The top of the raw material bin (11) is provided with a feeding port (111), the bottom of the fine material bin (12) is provided with a fine material outlet (121), and the bottom of the coarse material bin (13) is provided with a coarse material outlet (131).

9. The self-cleaning airflow screen of claim 1, wherein: The rotation shaft (21) is coaxially fixedly connected with a baffle disc (26), the baffle disc (26) is located between the fine material bin (12) and the coarse material bin (13), and the circumferential direction of the baffle disc (26) has a gap (261) with the fine material bin (12) and the coarse material bin (13).

10. The self-cleaning airflow screen of claim 1, wherein: The main shell (1) is connected with an air respirator (5), and the air respirator (5) is communicated with the fine material bin (12).

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