A grain gravity screening machine

Abstract

This utility model discloses a grain gravity screening machine, including a housing, a screening chamber, and an impurity channel. The screening chamber and the impurity channel are arranged inside the housing via a partition, and a flotation channel is provided between the screening chamber and the impurity channel at the top of the partition. Inside the screening chamber, two U-shaped screens with perforations are arranged vertically. The outer walls of the two U-shaped screens are connected to the inner wall of the screening chamber by evenly distributed springs. A vibrating motor is installed at the bottom of both U-shaped screens. This utility model, by employing a special vibrating screen structure combined with an adjustable vibrating motor, can precisely control the vibration frequency and amplitude, thereby changing the movement state of the grain on the screen. This design significantly improves the separation efficiency of grain and impurities, making it easier for particles with lower specific gravity to be blown or moved under the combined action of wind and vibration, and discharged through the slag outlet at the bottom of the impurity channel.

Description

Technical Field

[0001] This utility model relates to the field of grain screening technology, specifically a grain gravity screening machine. Background Technology

[0002] In the grain processing industry, grain screening is a crucial step in ensuring grain quality and the smooth progress of subsequent processing. With increasingly higher demands for grain quality and the large-scale development of the grain processing industry, higher requirements are being placed on the performance and efficiency of grain screening equipment.

[0003] Currently, most grain screening equipment on the market employs a single screening mechanism, such as relying solely on vibrating screens. This traditional screening method has several limitations. Firstly, its screening efficiency is limited by the screen structure and vibration method, making it difficult to efficiently separate grain particles of different specific gravities and sizes, as well as impurities. In actual screening, some lighter impurities (such as dust, straw fragments, and shriveled grains) may not be effectively separated, resulting in the screened grain still containing many impurities and affecting grain quality. Secondly, existing grain screening equipment typically uses a single-hole screen design, which cannot accurately grade and screen grains. During grain processing, different processing needs often require grains of different particle sizes and qualities. Single-hole screens cannot meet diverse screening requirements, resulting in the screened grain not accurately meeting subsequent processing needs, leading to resource waste and increased processing costs. Furthermore, the wind system design of some screening equipment is inadequate; the magnitude and direction of the wind force cannot be effectively adjusted according to actual needs, failing to fully utilize the role of wind force in gravity screening, resulting in low screening efficiency and failing to meet the production needs of large-scale grain processing. Utility Model Content

[0004] The purpose of this invention is to provide a grain gravity screening machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a grain specific gravity screening machine, comprising a housing, a screening chamber, and an impurity channel. The screening chamber and the impurity channel are arranged inside the housing through a partition, and a flotation channel is arranged between the screening chamber and the impurity channel at the top of the partition. U-shaped screen one and U-shaped screen two with screen holes are arranged vertically inside the screening chamber. The outer walls of U-shaped screen one and U-shaped screen two are connected to the inner wall of the screening chamber through evenly arranged springs, and a vibration motor is installed at the bottom of both U-shaped screen one and U-shaped screen two.

[0006] An air pump is mounted on the bottom of one side of the box via a bracket. The output end of the air pump is connected to an air inlet pipe, and an air inlet hood 1 and an air inlet hood 2 are mounted side by side on the air inlet pipe. The output ends of the air inlet hood 1 and the air inlet hood 2 are located at the upper and lower ends of the U-shaped screen 1, respectively. An air outlet communicating with the impurity channel is provided on the top of the other side of the box, and a filter box is installed on the box outside the air outlet.

[0007] Preferably, the sieve openings of the first U-shaped sieve are larger than those of the second U-shaped sieve, and the sieve openings of the first U-shaped sieve are larger than the volume of the grain itself, while the sieve openings of the second U-shaped sieve are smaller than the volume of the grain itself.

[0008] Preferably, the side walls of the box at the openings of the U-shaped screen one and the U-shaped screen two are provided with discharge ports, and slag discharge pipes and discharge pipes are respectively installed on the box outside the two discharge ports.

[0009] Preferably, the bottom of the box is provided with a base support, the bottom of the box above the base support is provided with a slag discharge port connected to the bottom of the screening chamber, and the top of the box is provided with a feed hopper whose output end extends into the screening chamber.

[0010] Preferably, a slag outlet connected to an impurity channel is provided on one side of the box, and a controller is installed on the side wall of the box above the slag outlet.

[0011] Preferably, the air inlet of the filter box extends to the inside of the air outlet and is equipped with a metal filter screen, and the interior of the filter box is provided with a non-woven filter layer and a polyester fiber filter layer arranged in parallel.

[0012] This utility model provides a grain gravity screening machine, which has significant advantages over the prior art, as detailed below:

[0013] 1. Highly efficient separation effect:

[0014] This invention employs a special vibrating screen structure combined with an adjustable vibrating motor to precisely control the vibration frequency and amplitude, thereby altering the movement of grain on the screen. This design significantly improves the separation efficiency of grain and impurities, making it easier for lighter particles (such as dust, straw fragments, and shriveled grains) to be blown or moved by the combined action of wind and vibration, and discharged through the slag outlet at the bottom of the impurity channel. In contrast, the screening effect of existing technologies is often limited by a single screening mechanism, making it difficult to achieve efficient separation.

[0015] 2. Precise hierarchical screening:

[0016] This invention features grading screens with different aperture sizes. U-shaped screen one and U-shaped screen two respectively intercept impurities of different sizes and specific gravities. The aperture of U-shaped screen one is larger than the volume of the grain itself, mainly used to intercept large particles of heavy impurities, which are discharged through the slag discharge pipe. The aperture of U-shaped screen two is smaller than the volume of the grain itself, used to screen small particles of heavy impurities, which are discharged through the slag discharge port. This grading screening mechanism not only improves screening accuracy but also ensures the quality of the screened grain, significantly outperforming the single-aperture screen design of existing technologies.

[0017] 3. Optimize the wind power system:

[0018] This invention incorporates a wind system on both sides of the screen. Airflow generated by an air pump acts on the grain, further enhancing the separation effect. Grains with lower specific gravity are more easily blown or moved by the wind, while heavier grains, due to their greater weight, are less affected by the wind and remain on the screen for further screening. This synergistic effect of wind and vibration enables efficient separation of grains with different specific gravities under the combined action of airflow and vibration, significantly improving screening efficiency.

[0019] 4. Reasonable structural design:

[0020] This utility model features a reasonable structural design. The internal chamber is equipped with a screening bin and an impurity channel via a partition, with a flotation channel at the top of the partition, ensuring smooth separation of grain and impurities. Furthermore, the outer walls of U-shaped screens one and two are connected to the inner wall of the screening bin via springs, effectively reducing wear on the screens during vibration and extending the equipment's service life. The base support and slag discharge port at the bottom of the chamber, along with the feed hopper at the top, make the entire device easy to operate and maintain.

[0021] 5. Environmentally friendly and energy-saving:

[0022] This invention reduces dust emissions during grain processing and lowers environmental pollution through a highly efficient separation and screening mechanism. Simultaneously, the rational configuration of the vibrating motor and air pump results in low energy consumption during operation, meeting energy conservation and emission reduction requirements. Compared to existing technologies, this invention has significant advantages in environmental protection and energy conservation.

[0023] 6. Improve product quality and yield:

[0024] Through precise grading and screening and an efficient separation mechanism, this invention effectively removes impurities from grains, improving product quality. Simultaneously, the increased screening efficiency reduces grain loss during production, increasing yield. For grain processing enterprises, this not only improves product quality but also reduces production costs, resulting in significant economic benefits.

[0025] 7. Highly adaptable:

[0026] This invention allows for flexible adjustment of vibration frequency, amplitude, and wind force according to different grain types and screening requirements, demonstrating strong adaptability. Whether large or small impurities, efficient separation can be achieved by adjusting equipment parameters, meeting diverse production needs.

[0027] In summary, this utility model grain gravity screening machine has significant advantages over existing technologies in terms of improving separation efficiency, accurate grading and screening, optimizing the air system, rational structural design, environmental protection and energy saving, improving product quality and yield, and adaptability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 2 This is a side view of the structure of this utility model;

[0030] Figure 3 This is a schematic diagram of the U-shaped screen structure of this utility model;

[0031] Figure 4 This is a schematic diagram of the internal structure of the filter box of this utility model;

[0032] In the diagram: 1. Box body; 2. Slag outlet; 3. Impurity channel; 4. Baffle plate; 5. Controller; 6. Filter box; 7. Air outlet; 8. Flotation channel; 9. Feed hopper; 10. Screening bin; 11. Air inlet hood one; 12. Discharge port; 13. Spring; 14. Air inlet pipe; 15. Air inlet hood two; 16. U-shaped screen two; 17. Air pump; 18. Vibrating motor; 19. Slag discharge port; 20. Slag discharge pipe; 21. Discharge pipe; 22. Base support; 23. Screen holes; 24. Metal filter screen; 25. Non-woven filter layer; 26. Polyester fiber filter media layer; 27. U-shaped screen one. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] Please see Figure 1-4The present invention provides an embodiment of a grain gravity screening machine, comprising a housing 1, a screening chamber 10, and an impurity channel 3. The screening chamber 10 and the impurity channel 3 are arranged inside the housing 1 through a partition 4, and a flotation channel 8 is arranged between the screening chamber 10 and the impurity channel 3 at the top of the partition 4. The screening chamber 10 is provided with a U-shaped screen 1 27 and a U-shaped screen 26 with screen holes 23 arranged vertically inside the screening chamber 10. The screen holes 23 of the U-shaped screen 1 27 are larger than the screen holes 23 of the U-shaped screen 26, and the screen holes 23 of the U-shaped screen 1 27 are larger than the volume of the grain itself, while the screen holes 23 of the U-shaped screen 26 are smaller than the volume of the grain itself.

[0035] Both the U-shaped screen 1 (27) and the U-shaped screen 2 (16) have discharge ports 12 on their side walls. The two discharge ports 12 are respectively equipped with slag discharge pipes 20 and discharge pipes 21 on the outer side of the box 1.

[0036] The outer walls of U-shaped screen 127 and U-shaped screen 26 are connected to the inner wall of screening chamber 10 by evenly arranged springs 13, and a vibration motor 18 is installed at the bottom of both U-shaped screen 127 and U-shaped screen 26.

[0037] The housing 1 has a rectangular structure, and its interior is divided into a screening chamber 10 and an impurity channel 3 by a partition 4. The partition 4 is perpendicular to the bottom surface of the housing 1, and a flotation channel 8 is provided at the top, so that the screening chamber 10 and the impurity channel 3 are connected at the top.

[0038] Inside the screening chamber 10, U-shaped screen 1 27 and U-shaped screen 2 16 are arranged sequentially from top to bottom. The screen hole 23 of U-shaped screen 1 27 has a larger diameter than the volume of the grain itself, and is mainly used to separate larger impurities; the screen hole 23 of U-shaped screen 2 16 has a smaller diameter than the volume of the grain itself, and is mainly used to separate fine impurities and dust.

[0039] Specifically, the sieve openings 23 of U-shaped screen 1 (27) have a diameter of 5-10 mm, while the sieve openings 23 of U-shaped screen 2 (16) have a diameter of 1-3 mm. This design ensures that impurities of different sizes can be effectively removed when grain passes through the two layers of sieves.

[0040] The side walls of the housing 1 corresponding to the openings of U-shaped screen 17 and U-shaped screen 26 are respectively provided with discharge ports 12. A slag discharge pipe 20 and a discharge pipe 21 are respectively installed on the outer side of the discharge ports 12. The slag discharge pipe 20 is used to discharge larger impurities screened by U-shaped screen 17, while the discharge pipe 21 is used to discharge the pure grain screened by U-shaped screen 26.

[0041] To ensure the stability and screening effect of the screens, the outer walls of U-shaped screen 27 and U-shaped screen 16 are connected to the inner wall of the screening chamber 10 by evenly spaced springs 13. The function of the springs 13 is to buffer and adjust the position of the screens during vibration, maintaining the balance of the screens.

[0042] In addition, both the bottom of U-shaped screen 17 and U-shaped screen 26 are equipped with a vibration motor 18. The vibration motor 18 generates vibration to keep the screen in dynamic motion during the screening process, thereby improving screening efficiency and effectiveness.

[0043] An air pump 17 is mounted on the bottom of one side of the housing 1 via a bracket. The output end of the air pump 17 is connected to an air inlet pipe 14. An air inlet hood 11 and an air inlet hood 25 are mounted side by side on the air inlet pipe 14. The output ends of the air inlet hood 11 and the air inlet hood 25 are located at the upper and lower ends of the U-shaped screen 27, respectively. An air outlet 7 connected to the impurity channel 3 is provided on the top of the other side of the housing 1. A filter box 6 is installed on the housing 1 outside the air outlet 7.

[0044] The air inlet of the filter box 6 extends to the inside of the air outlet 7 and is equipped with a metal filter screen 24. The filter box 6 also has a non-woven filter layer 25 and a polyester fiber filter layer 26 arranged side by side inside.

[0045] Air pump 17: Air pump 17 is installed at the bottom of one side of housing 1 and is fixed by a bracket. The function of air pump 17 is to provide power to draw outside air into the device. The output end of air pump 17 is connected to air inlet pipe 14.

[0046] Air inlet duct 14: One end of the air inlet duct 14 is connected to the output end of the air pump 17, and the other end is connected to the air inlet hood 11 and the air inlet hood 2 15 respectively. The air inlet duct 14 is made of a material with a certain degree of flexibility to ensure smooth airflow.

[0047] Air inlet hood 11 and air inlet hood 25: Air inlet hood 11 and air inlet hood 25 are installed side by side on the air inlet pipe 14, and their output ends are located at the upper and lower ends of the U-shaped screen 27, respectively. The design of the air inlet hoods allows for uniform air distribution and improves purification efficiency.

[0048] U-shaped screen 27: U-shaped screen 27 is located inside housing 1, with its upper and lower ends corresponding to the output ends of air inlet hood 11 and air inlet hood 25, respectively. The function of U-shaped screen 27 is to initially filter large particulate impurities in the air.

[0049] Air outlet 7: Air outlet 7 is located on the top of the other side of the housing 1 and is connected to the impurity channel 3. The purified air is discharged through air outlet 7.

[0050] Filter box 6: Filter box 6 is installed on the casing 1 outside the air outlet 7, with its air inlet extending to the inside of the air outlet 7. Filter box 6 contains multiple layers of filter material to ensure thorough air purification.

[0051] Metal filter 24: The metal filter 24 is installed at the air inlet of the filter box 6. It is mainly used to filter larger particles in the air and prevent them from entering the subsequent fine filter layer.

[0052] Non-woven filter layer 25: The non-woven filter layer 25 is located inside the filter box 6, close to the metal filter screen 24. The non-woven filter layer 25 can effectively filter fine particulate matter and some microorganisms in the air.

[0053] Polyester fiber filter media layer 26: The polyester fiber filter media layer 26 is located after the non-woven fabric filter layer 25, serving as the final filtration barrier to further purify the air and ensure the cleanliness of the exhaust air.

[0054] The bottom of the box 1 is provided with a base support 22, and the bottom of the box 1 above the base support 22 is provided with a slag discharge port 19 connected to the bottom of the screening chamber 10. The top of the box 1 is provided with a feed hopper 9 whose output end extends into the screening chamber 10.

[0055] A slag outlet 2 connected to the impurity channel 3 is provided on one side of the box body 1, and a controller 5 is installed on the side wall of the box body 1 above the slag outlet 2.

[0056] The housing 1 is the main body of this device, and a base support 22 is installed at its bottom. The base support 22 is made of high-strength steel to ensure the stability and durability of the device. The base support 22 is designed with a rectangular structure and has adjusting screws at the four corners to adjust the level of the device and ensure the smooth operation of the screening process.

[0057] A slag discharge port 19 is provided at the bottom of the box 1 above the base support 22. The slag discharge port 19 is connected to the bottom of the screening chamber 10 by a flange connection. The design of the slag discharge port 19 facilitates the smooth discharge of waste residue after screening, reducing the difficulty of cleaning and maintenance.

[0058] A feed hopper 9 is installed on the top of the housing 1, and the output end of the feed hopper 9 extends into the interior of the screening chamber 10. The feed hopper 9 is designed with an incline to allow materials to enter the screening chamber 10 smoothly. The feed hopper 9 is made of stainless steel with a smooth surface to prevent materials from sticking together.

[0059] The opening of the feed hopper 9 is equipped with a dust cover to prevent dust from flying and ensure a clean operating environment. A regulating valve is located at the bottom of the feed hopper 9 to adjust the material feeding speed as needed, ensuring uniformity in the screening process.

[0060] A slag outlet 2 is provided on one side of the housing 1, and the slag outlet 2 is connected to the impurity channel 3. The slag outlet 2 is designed with a rectangular opening to facilitate the discharge of waste slag. The inner wall of the slag outlet 2 is equipped with a wear-resistant coating to extend its service life.

[0061] Impurity channel 3 is an inclined channel with a collection box at its end for collecting waste slag discharged from slag outlet 2. The inner wall of impurity channel 3 is also coated with a wear-resistant coating to ensure the durability of the channel.

[0062] A controller 5 is installed on the side wall of the box 1 above the slag outlet 2. The main functions of the controller 5 include controlling and adjusting the vibration frequency of the screening chamber 10 and monitoring the working status of the entire screening process.

[0063] When this application embodiment is used,

[0064] Feeding stage: Grain enters the screening chamber 10 through the feed hopper 9 at the top of the box. The dust cover at the opening of the feed hopper 9 can prevent dust from flying, and the regulating valve below can adjust the feeding speed of the grain according to the actual screening needs, so that the grain can enter the screening chamber 10 evenly and stably, ensuring the uniformity of the screening process.

[0065] Preliminary Screening (U-shaped Screen 1): Grain entering the screening chamber 10 first falls onto U-shaped screen 27. The vibrating motor 18 at the bottom of U-shaped screen 27 starts working, generating vibration to keep the screen in dynamic motion. Because the diameter of the screen holes 23 of U-shaped screen 27 is relatively large (5-10 mm), larger than the volume of the grain itself, large particles of impurities with a higher specific gravity (such as large stones, clods of soil, etc.) will be intercepted on U-shaped screen 27. With the vibration of the screen, these large particles of impurities will be discharged from the screening machine through the discharge port 12 on the side wall of the box at the opening of U-shaped screen 27 and through the slag discharge pipe 20. Grain, impurities with a lower specific gravity, and particles smaller than grain will fall onto U-shaped screen 26 below through the screen holes 23.

[0066] Secondary screening (U-shaped screen two): Grain and impurities falling onto U-shaped screen two 16 continue to move under the vibration of the vibrating motor 18 at the bottom of U-shaped screen two 16. The screen holes 23 of U-shaped screen two 16 have a small diameter (1-3 mm), smaller than the volume of the grain itself. Therefore, small particles of impurities with a high specific gravity (such as small stones, sand, etc.) and dust will fall to the bottom of the screening chamber 10 through the screen holes 23 and eventually be discharged through the slag discharge port 19. The qualified pure grain will remain on U-shaped screen two 16 and be discharged from the screening machine through the discharge port 12 on the side wall of the box at its opening, and then through the discharge pipe 21, completing the screening process.

[0067] Wind-assisted screening: During the screening process described above, the air pump 17 at the bottom of one side of the housing 1 is activated, drawing in external air through the air inlet pipe 14 and blowing it evenly onto the upper and lower ends of the U-shaped screen 27 via the air inlet hood 11 and the air inlet hood 25. Particles with lower specific gravity (such as dust, straw fragments, and shriveled grains) are more easily blown or moved by the wind. These low-density impurities enter the impurity channel 3 through the flotation channel 8 and are then discharged through the air outlet 7 at the top of the other side of the housing 1. Meanwhile, grain particles with higher specific gravity are less affected by the wind due to their greater weight and remain on the screen for further screening, further improving the separation effect between grain and impurities.

[0068] Air filtration: The air containing impurities discharged from the air outlet 7 enters the filter box 6. First, it passes through the metal filter 24 at the air inlet to filter out larger particles in the air; then it enters the non-woven fabric filter layer 25 to filter out fine particles and some microorganisms; finally, it passes through the polyester fiber filter layer 26 for final purification to ensure that the discharged air meets clean standards and reduces environmental pollution.

[0069] Waste collection and treatment: Large particulate impurities discharged from the slag discharge pipe 20, small particulate impurities discharged from the slag discharge port 19, and light impurities (such as dust, straw fragments, etc.) discharged from the slag discharge port 2 through the impurity channel 3 will be collected into the corresponding collection devices (such as collection boxes) for subsequent unified treatment and cleaning.

[0070] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0071] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0072] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0073] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A grain gravity screening machine, comprising a housing (1), a screening chamber (10), and an impurity channel (3), characterized in that: The interior of the box (1) is provided with a screening chamber (10) and an impurity channel (3) through a partition (4), and a flotation channel (8) is provided between the screening chamber (10) and the impurity channel (3) at the top of the partition (4). The interior of the screening chamber (10) is provided with a U-shaped screen one (27) and a U-shaped screen two (16) with screen holes (23) arranged vertically. The outer walls of the U-shaped screen one (27) and the U-shaped screen two (16) are connected to the inner wall of the screening chamber (10) through evenly arranged springs (13). The bottom of the U-shaped screen one (27) and the U-shaped screen two (16) are both equipped with a vibration motor (18). An air pump (17) is installed on the bottom of one side of the box (1) via a bracket. The output end of the air pump (17) is connected to an air inlet pipe (14). An air inlet hood (11) and an air inlet hood (15) are installed side by side on the air inlet pipe (14). The output ends of the air inlet hood (11) and the air inlet hood (15) are located at the upper and lower ends of the U-shaped screen (27), respectively. An air outlet (7) communicating with the impurity channel (3) is provided on the top of the other side of the box (1). A filter box (6) is installed on the box (1) outside the air outlet (7).

2. The grain gravity screening machine according to claim 1, characterized in that: The sieve hole (23) of the first U-shaped sieve (27) is larger than the sieve hole (23) of the second U-shaped sieve (16), and the sieve hole (23) of the first U-shaped sieve (27) is larger than the volume of the grain itself, while the sieve hole (23) of the second U-shaped sieve (16) is smaller than the volume of the grain itself.

3. A grain gravity screening machine according to claim 1, characterized in that: The side walls of the box (1) at the openings of the U-shaped screen one (27) and the U-shaped screen two (16) are provided with discharge ports (12), and the box (1) outside the two discharge ports (12) are respectively equipped with slag discharge pipe (20) and discharge pipe (21).

4. A grain gravity screening machine according to claim 1, characterized in that: The bottom of the box (1) is provided with a base support (22), and the bottom of the box (1) above the base support (22) is provided with a slag discharge port (19) connected to the bottom of the screening chamber (10), and the top of the box (1) is provided with a feed hopper (9) whose output end extends into the screening chamber (10).

5. A grain gravity screening machine according to claim 1, characterized in that: A slag outlet (2) connected to the impurity channel (3) is provided on one side of the box (1), and a controller (5) is installed on the side wall of the box (1) above the slag outlet (2).

6. A grain gravity screening machine according to claim 1, characterized in that: The air inlet of the filter box (6) extends to the inside of the air outlet (7) and is equipped with a metal filter screen (24). The filter box (6) is also equipped with a non-woven filter layer (25) and a polyester fiber filter material layer (26) arranged side by side inside.

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