A grain drying tower feed conduit

Abstract

The utility model relates to agricultural machinery technical field especially discloses a kind of grain drying tower feed pipe, comprising: round pipe, soft screw conveyer is rotatably installed in round pipe, discharge end of round pipe is fixedly installed with discharge port, the surface of round pipe is fixedly installed with feed hopper, the lower portion of round pipe is provided with pipe fitting, the top end of pipe fitting is penetrated round pipe and fixedly installed with filter bag, both can ensure that dust removal action and grain conveying are carried out synchronously, avoid dust removal lag leading to dust with grain into drying tower in advance, dust can be accurately intercepted, no secondary pollution by the structural design of each component, effectively solve the problem that grain conveying is not complete in prior art, prone to secondary pollution, and cannot adapt to different dust content grain dust removal needs, prevent dust with grain into drying tower from source, guarantee grain quality after drying, avoid dust adhering drying tower inner wall or blocking pipe fitting simultaneously, ensure that drying process is stable and efficient.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a feed pipe for a grain drying tower. Background Technology

[0002] In the field of grain processing and storage, grain drying towers are the core equipment to ensure that the moisture content of grain meets the standards and to prevent mold. As the pre-entry channel for grain into the drying tower, the operation of the feed pipe directly affects the stability of the drying process and the quality of grain. Most existing grain drying tower feed pipes are directional conveying as their core function. Through the cooperation of the pipe and conveying components, the grain to be dried is transported from the feed end to the drying tower. It is a key link connecting the grain pretreatment and drying processes.

[0003] In the course of serving farmers, grain purchasing stations, and large processing enterprises for a long time, we have received a lot of feedback from users about the use of traditional feeding pipes. The core problem is that traditional pipes can only transport grain and have no dust removal capability. The grain to be dried is often mixed with field dust, broken grain powder, and other impurities. After these dusts enter the pipes with the grain, they will adhere to the surface of the grain, resulting in an increased impurity rate after drying and failing to meet the purchase standards. Users need to add an extra screening process, which increases processing costs. On the other hand, dust can easily accumulate on the inner wall of the drying tower, forming dirt. This not only increases the difficulty of cleaning the equipment, but also can block the pipes and the feed inlet of the drying tower in the long run, causing the drying process to be interrupted and requiring shutdown for cleaning, which seriously affects production efficiency. More importantly, the dust content varies greatly among different grains, and traditional pipes have no ability to adapt and adjust. When dealing with grains with high dust content, the above problems are more prominent and cannot meet the diverse production needs of users.

[0004] To address the aforementioned user pain points and improve the quality of feed materials and process stability before grain drying, we have developed a feed pipe for a grain drying tower. This pipe, through the coordinated design of the main conveying structure, dust filtration and cleaning structure, power drive structure, and mobile support structure, can simultaneously and accurately clean dust during grain conveying. This not only prevents dust from entering the drying tower with the grain but also adapts to the processing needs of grains with different dust contents. At the same time, it reduces the risk of secondary pollution and equipment blockage, providing support for users to improve drying efficiency and grain quality. Utility Model Content

[0005] Technical problems to be solved

[0006] In view of the shortcomings of the existing technology, this utility model solves the technical problem that the conventional pipeline can only realize the transport of grain and has no dust removal capability, and the grain to be dried is often mixed with impurities such as field dust and broken grain powder.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A grain drying tower feed pipe includes: a circular pipe, a flexible auger rotatably installed inside the circular pipe, a discharge port fixedly installed at the discharge end of the circular pipe, a feed hopper fixedly installed on the surface of the circular pipe, a pipe fitting disposed below the circular pipe, a filter bag fixedly installed at the top end of the pipe fitting penetrating the circular pipe, a filter plate fixedly installed on the circular pipe and inside the pipe fitting, a hollow cylinder fixedly installed at the bottom end of the pipe fitting, a fan blade rotatably installed inside the hollow cylinder, a first servo motor fixedly installed at the bottom of the hollow cylinder, and a power assembly located on the circular pipe and used to drive the flexible auger to rotate. Through the coordinated operation of the various components, grain can enter the circular pipe through the feed hopper and move towards the discharge port under the conveying of the flexible auger. At the same time, with the help of the filter structure and the fan blade, impurities can be filtered or preliminarily dried in the grain simultaneously. The power assembly provides stable power for the entire conveying process, ensuring a continuous and efficient feeding process.

[0009] Preferably, the power assembly includes a protective shell, which is fixedly installed at the bottom of the circular tube. A second servo motor is fixedly installed inside the protective shell. The output shaft of the second servo motor passes through the circular tube and is fixedly installed with a fixing column. The two ends of the fixing column are respectively fixedly connected to the two ends of the flexible auger. The protective shell can effectively protect the second servo motor from external dust and debris. The second servo motor directly drives the flexible auger through the fixing column. The transmission path is short and efficient. The speed of the flexible auger can be precisely controlled, thereby flexibly adjusting the grain conveying speed to adapt to different drying rhythms.

[0010] Preferably, wheels are rotatably mounted on both sides of the protective shell, and the output shaft of the second servo motor is rotatably connected to the round tube. The wheels on both sides of the protective shell greatly improve the overall mobility of the pipeline, making it easy to quickly adjust the equipment placement according to the position of the drying tower. The rotatable connection design between the output shaft and the round tube reduces the frictional resistance during operation, making the soft auger rotate more smoothly and reducing noise and component wear.

[0011] Preferably, the two ends of the fixed column are tightly welded to the two ends of the flexible auger. This tight welding connection ensures the structural strength between the fixed column and the flexible auger, preventing loosening or breakage at the connection even when the conveying volume is large or the flexible auger is running at high speed, thus ensuring the stability of power transmission and extending the service life of the equipment.

[0012] Preferably, the output shaft of the first servo motor passes through the hollow cylinder and is tightly welded to the fan blade. Several ventilation holes are opened at the bottom of the hollow cylinder. The tight welding of the output shaft and the fan blade ensures the reliability of power transmission. With the ventilation holes at the bottom of the hollow cylinder, a stable airflow circulation can be formed, which can efficiently discharge dust, moisture and other substances in the tube through the filter structure, thereby improving the cleanliness and dryness of the grain.

[0013] Preferably, the diameter of the holes on the filter plate is smaller than the particle size of common grains. This design can effectively prevent grains from falling from the pipe and allow fine impurities mixed in the grains to enter the filter bag through the holes, achieving precise separation of grains and impurities and significantly improving the purity of the feed.

[0014] Preferably, a bracket is fitted on the round pipe and located on one side of the pipe fitting. Two wheels are rotatably installed at the bottom of the bracket to provide stable support for the round pipe and prevent it from deforming due to its own weight or grain pressure. The wheels at the bottom further enhance the mobility of the equipment and make it easy to flexibly adjust the installation position of the pipe according to actual needs.

[0015] Preferably, the circular tube has an inclined structure, and the feed hopper is connected to the circular tube. The inclined structure can use gravity to assist the grain to move towards the discharge port, reduce the conveying resistance of the soft auger, and improve the conveying efficiency. The connection between the feed hopper and the circular tube ensures that the grain can smoothly enter the interior of the circular tube, avoids feeding blockage, and ensures the continuity of the feeding process.

[0016] Beneficial effects

[0017] As the main conveying structure transports the grain along the circular tube, the dust filtration and cleaning structure is simultaneously activated to achieve precise dust removal. The first servo motor, fixed to the bottom of the hollow cylinder, begins operation, its output shaft driving the fan blades inside the cylinder to rotate synchronously. The rotation of the fan blades generates suction, drawing outside air in through the ventilation holes of the hollow cylinder, creating a stable upward airflow. This airflow continues to rise along the tube integrally formed with the hollow cylinder, eventually entering the tube and acting on the thin layer of grain inside. When the airflow contacts the grain layer, dust mixed in with the grain is adsorbed by the airflow and carried towards the tube inlet. As the air moves, the filter plate, fixed inside the cylindrical tube and located at the tube inlet, comes into play. Its evenly spaced 1-2mm holes allow only dust particles to pass through with the airflow, effectively preventing grain from entering the tube and thus avoiding grain loss or pipe blockage caused by grain entering the tube. Dust entering the tube with the airflow is continuously transported along the tube. Because the top of the tube is sealed to the filter bag and the bottom is integrally formed with the hollow cylinder, a closed passage is created, completely preventing dust from overflowing during transport and avoiding secondary pollution. Finally, the dust is transported into the filter bag, which is made of high-density polyester filter cloth. Made to precisely trap dust particles, the filter cloth surface is treated with an anti-stick coating to effectively prevent dust from adhering to the filter cloth and clogging the filter pores, ensuring smooth airflow. Clean airflow passes through the filter cloth and is discharged outwards, achieving efficient air-dust separation. Simultaneously, the first servo motor features an adjustable speed design, allowing operators to flexibly adjust the motor speed according to the actual dust content of the grain, thereby changing the airflow intensity to adapt to different dust removal needs. When processing grains with high dust content, an additional set of identical dust filtration and cleaning structures can be added in the middle of the circular tube, forming a two-stage dust removal mode of front-end coarse cleaning and rear-end fine cleaning, further improving the dust removal effect. Through the coordinated operation of the first servo motor, fan blades, pipe fittings, filter plates, and filter bags, the dust removal action can be synchronized with the grain conveying, preventing dust from entering the drying tower prematurely with the grain due to delayed dust removal. Furthermore, the structural design of each component enables precise dust interception and eliminates secondary pollution. This effectively solves the problems of incomplete dust removal during grain conveying, easy secondary pollution, and inability to adapt to the dust removal needs of grains with different dust contents in existing technologies. It prevents dust from entering the drying tower with the grain at the source, ensuring the quality of the dried grain. At the same time, it prevents dust from adhering to the inner wall of the drying tower or clogging the pipes, ensuring a stable and efficient drying process. Attached Figure Description

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is one of the overall structural diagrams of this utility model;

[0020] Figure 2 This is the second overall structural diagram of the present invention;

[0021] Figure 3 This is a detailed internal structural diagram of the circular tube of this utility model;

[0022] Figure 4 This is a detailed internal structural diagram of the hollow cylinder of this utility model.

[0023] Legend: 1. Circular tube; 2. Feed hopper; 3. Protective shell; 4. Discharge port; 5. Pipe fitting; 6. Filter bag; 7. Hollow cylinder; 8. First servo motor; 9. Support bracket; 10. Soft auger; 11. Fixed column; 12. Second servo motor; 13. Fan blade; 14. Filter plate. Detailed Implementation

[0024] This application provides a grain drying tower feed pipe that effectively solves the technical problem that traditional grain drying tower feed pipes can only transport grain but cannot clean the dust mixed in the grain. As a result, the dust enters the drying tower with the grain, which not only reduces the quality of the dried grain but may also adhere to the inner wall of the drying tower, causing equipment pollution. Furthermore, long-term accumulation can easily lead to pipe blockage and affect the overall drying process efficiency.

[0025] like Figure 1 - Figure 4 As shown, the technical solution in this application embodiment is designed to effectively solve the above-mentioned technical problems, and the overall approach is as follows:

[0026] To address the shortcomings of existing technologies that only convey grain without cleaning, this utility model provides a grain drying tower feed pipe. The core of the pipe consists of a main conveying structure, a dust filtration and cleaning structure, a power drive structure, and a mobile support structure. The main conveying structure ensures stable grain conveying, the dust filtration and cleaning structure precisely removes dust from the grain through airflow separation technology, the power drive structure provides continuous power for conveying and cleaning, and the mobile support structure ensures flexible relocation of the equipment to adapt to different drying scenarios. The four components work together to form an integrated solution for conveying, cleaning, and maintenance, solving the problem of dust residue in the grain feeding process from the source.

[0027] Main conveying structure: It undertakes the directional conveying of grain from feed to discharge, ensuring that the grain is evenly distributed in the pipeline and creating conditions for dust filtration. It includes a circular pipe 1, a flexible auger 10, a feed hopper 2 and a discharge port 4.

[0028] Round tube 1: The overall structure's installation frame and grain conveying channel are made of corrosion-resistant stainless steel to avoid grain residue and rust. It is designed as an inclined structure, which uses gravity to assist the grain to move slowly. This reduces the conveying load of the soft auger 10 and allows the grain to form a thin layer inside the tube, preventing dust from being wrapped in the grain and unable to be separated. At the same time, it provides precise installation points for the soft auger 10 and the dust filter cleaning structure, ensuring that there is no deviation when each component is running.

[0029] Soft auger 10: Grain conveying actuator, rotatably installed inside the round tube 1. It is made of wear-resistant rubber and metal frame composite material. Its flexibility allows it to fit tightly against the inner wall of the round tube 1, preventing grain and dust from remaining on the tube wall. When rotating, it can gently turn the grain, allowing the dust wrapped between the grains to be fully exposed, which is convenient for subsequent airflow adsorption. Through the rotation of the spiral blades, the grain is pushed at a uniform speed along the length of the round tube 1. The conveying speed can be adjusted with the power component to adapt to different dust removal needs.

[0030] Feed hopper 2: Grain feeding interface, fixed on the upper surface of the round tube 1, adopts an inverted conical flared design, the enlarged feeding area facilitates manual or feeding equipment to replenish the material, avoids grain spillage, the lower opening is seamlessly connected to the round tube 1, and has a built-in guide plate to guide the grain into the round tube 1 evenly, preventing local grain accumulation that leads to incomplete dust separation.

[0031] Discharge port 4: The transition structure between grain and drying tower, fixed to the discharge end of round pipe 1, adopts a flared design, and the lower opening is adapted to the size of common drying tower inlet. It can guide the cleaned grain to be accurately discharged into the drying tower, avoid secondary introduction of external dust during discharge, and ensure the cleaning effect.

[0032] Dust filtration and cleaning structure: Through airflow adsorption filtration and interception technology, dust in grain is precisely removed to prevent dust from entering the drying tower. It includes pipe 5, filter bag 6, filter plate 14, hollow cylinder 7, fan blade 13 and first servo motor 8.

[0033] Fitting 5: Dust and airflow conveying channel, vertically fixed below the round pipe 1, made of rigid PVC pipe, the top end of which passes through the round pipe 1 and is sealed to the filter bag 6, and the bottom end is integrally formed with the hollow cylinder 7, forming a closed passage of the hollow cylinder 7 pipe filter bag 6 to prevent dust from overflowing during the conveying process and causing secondary pollution.

[0034] Filter bag 6: Dust trapping component, made of high-density polyester filter cloth, can trap dust particles. The surface of the filter cloth is treated with anti-stick to prevent dust from adhering and clogging the filter pores. It is detachably connected to the tube 5 by buckle, which is convenient for subsequent dust cleaning. When working, the dust-laden airflow enters the filter bag 6, the dust is trapped by the filter cloth, and the clean airflow passes through the filter cloth and is discharged, realizing air-dust separation.

[0035] Filter plate 14: a barrier separating grain and dust, fixed inside the round tube 1 and located at the inlet of the pipe fitting 5. It is made of thin stainless steel plate with evenly spaced holes of 1-2 mm in diameter, which can effectively block grain from entering the pipe fitting 5 and only allow dust particles to pass through with the airflow, thus preventing grain loss or pipe blockage from the source.

[0036] Hollow cylinder 7: The mounting carrier for the airflow generating component. It is made of stainless steel to provide rotation space, while introducing outside air through the vents to ensure a stable airflow supply. The inner wall of the cylinder is smoothed to reduce airflow resistance and improve dust adsorption efficiency.

[0037] Fan blade 13: The core component for airflow generation, rotatably installed inside the hollow cylinder 7, made of ABS engineering plastic. When the blade rotates, it can generate a stable upward airflow. The airflow rises along the pipe 5 into the circular pipe 1, precisely acting on the thin layer of grain and adsorbing the dust therein. Fan blade 13 is tightly welded to the output shaft of the first servo motor 8 to ensure that the power is transmitted without slippage and the airflow speed is stable.

[0038] First servo motor 8: airflow power source, fixed at the bottom of hollow cylinder 7, adopts adjustable speed servo motor, can adjust speed according to the dust content of grain to achieve differentiated dust removal, suitable for long-term continuous operation in the workshop;

[0039] Power drive structure: provides power for the rotation of soft auger 10 and fan blade 13 respectively, ensuring that the two operate in coordination, i.e., power component, including protective shell 3, second servo motor 12 and fixed column 11;

[0040] Protective shell 3: The protective structure of the second servo motor 12 is fixed to the bottom of the round tube 1. It is made of cold-rolled steel plate and has the functions of dust prevention and grain impact prevention, extending the service life of the motor. Silent wheels are rotatably installed on both sides of the shell. The wheels are equipped with a braking mechanism to assist the overall movement of the equipment.

[0041] Second servo motor 12: Power source for soft auger 10, fixed inside the protective shell 3, adopts a high torque servo motor, which can drive soft auger 10 to rotate stably when bearing grain load, without stopping or jamming. The motor output shaft passes through the round tube 1 and is rotatably connected to the round tube 1 through a deep groove ball bearing.

[0042] Fixed column 11: Power transmission connector, made of solid 45 steel, with both ends tightly welded to both ends of the soft auger 10 to ensure it can withstand the torque of the screw conveyor without the risk of breakage. One end of the fixed column 11 is fixedly connected to the output shaft of the second servo motor 12 by a key, so as to realize the synchronous rotation of the motor, fixed column 11 and soft auger 10, and ensure that the grain conveying speed matches the ash removal airflow.

[0043] Mobile support structure: ensures that the equipment can be flexibly moved to different drying towers, while ensuring stability during operation, i.e., support frame 9;

[0044] Support 9: It adopts an angle steel welded frame structure, which is sleeved on the round tube 1 and located on one side of the pipe fitting 5. Two rubber anti-slip wheels are rotatably installed at the bottom of the frame, which work together with the wheels of the protective shell 3 to allow the equipment to be easily pushed by two people. The top of the support 9 is equipped with a height fine-adjustment bolt, which can be finely adjusted after the equipment is in place to ensure that the discharge port 4 is accurately connected with the feed port of the drying tower, so as to avoid grain spillage or external dust entering.

[0045] Example 1

[0046] This embodiment takes wheat drying feed as an example to explain in detail the dust removal operation process and effect of the equipment. The steps are as follows:

[0047] Before the equipment is in place and the dust is removed, the operator should unlock the wheel brakes of the support 9 and the protective shell 3, push the equipment to the feeding position of the grain drying tower, confirm the tilt direction of the round pipe 1, and align the lower opening of the discharge port 4 with the feeding port of the drying tower through the height fine adjustment bolts of the support 9, ensure that the holes of the filter plate 14 are not blocked, and that the guide plate of the feed hopper 2 is not deformed, and ensure that the dust removal-related components are in normal condition.

[0048] When the power is connected to the grain conveying equipment, the second servo motor 12 is started first. The motor drives the fixed column 11 to rotate synchronously, which in turn drives the soft auger 10 to rotate at a constant speed inside the round tube 1. The operator continuously feeds wheat into the feed hopper 2 through the conveyor belt. The wheat is guided by the guide plate of the feed hopper 2 and enters the round tube 1 evenly to form a thin layer. It is slowly pushed by the soft auger 10 along the inclined direction. During the pushing process, the soft auger 10 gently turns the wheat to fully expose the dust wrapped in it.

[0049] After 30 seconds of synchronous dust filtration and grain conveying, a stable grain layer is formed inside. The first servo motor 8 is started, and the motor drives the fan blade 13 to rotate at high speed inside the hollow cylinder 7. Outside air enters through the vent at the bottom of the hollow cylinder 7, forming an upward airflow that rises along the pipe 5 into the circular pipe 1. The airflow acts on the thin layer of wheat, adsorbing the dust particles in it. The dust passes through the holes of the filter plate 14 with the airflow and enters the pipe 5, and is finally conveyed to the filter bag 6. The dust is trapped by the filter cloth, and the clean airflow passes through the filter bag 6 and is discharged.

[0050] After the dust removal process, the wheat, which has been pushed by the soft auger 10 and cleaned of dust, is continuously conveyed to the discharge port 4 and precisely discharged into the drying tower through the funnel-shaped guide. During the 10-hour continuous operation cycle, wheat is continuously replenished to the feed hopper 2. The equipment operates stably and a total of 50 tons of wheat is conveyed. After the operation is completed, the second servo motor 12 is turned off first. After the wheat remaining in the round pipe 1 is completely discharged, the first servo motor 8 is turned off. The filter bag 6 is disassembled, the dust trapped inside is cleaned, the filter cloth is blown clean with compressed air after cleaning, the filter bag 6 is reinstalled, and the power supply to the equipment is cut off.

[0051] Dust removal effect: During long-term operation, the wheat dust removal rate is high, which meets the standards for high-quality wheat drying. The equipment does not stop due to dust clogging the pipes, and there is no secondary dust generation during the dust removal process, which meets the environmental protection requirements of the workshop.

[0052] Example 2:

[0053] This embodiment demonstrates the flexibility and applicability of dust removal for different grain types and dust content scenarios, as well as routine equipment maintenance, as follows:

[0054] Optimization of dust removal for corn with high dust content: When processing corn with high dust content, a two-stage dust removal mode is adopted: a set of identical dust filter cleaning structures is added in the middle of the circular tube 1 to form a two-stage dust removal process with coarse cleaning at the front end and fine cleaning at the back end, which significantly improves the dust removal effect.

[0055] After 4 hours of continuous operation, the filter bag 6 needs to be cleaned to remove the dust trapped inside in order to prevent the filter holes from becoming clogged. The equipment does not need to be shut down; simply pause the first servo motor 8, unfasten the clips connecting the filter bag 6 to the fitting 5, remove the filter bag 6, shake the filter cloth to allow the dust to fall into the collection bag, and use low-pressure compressed air to blow air from the inside of the filter bag 6 outwards to clean the residual dust inside the filter holes. After cleaning, re-fasten the filter bag 6, start the first servo motor 8, and resume the dust removal operation without affecting the continuity of grain conveying.

[0056] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A feed pipe for a grain drying tower, characterized in that, include: A circular tube (1) is rotatably installed inside the circular tube (1). A discharge port (4) is fixedly installed at the discharge end of the circular tube (1). A feed hopper (2) is fixedly installed on the surface of the circular tube (1). A pipe fitting (5) is provided below the circular tube (1). A filter bag (6) is fixedly installed at the top end of the pipe fitting (5) through the circular tube (1). A filter plate (14) is fixedly installed on the circular tube (1) and inside the pipe fitting (5). A hollow cylinder (7) is fixedly installed at the bottom end of the pipe fitting (5). A fan blade (13) is rotatably installed inside the hollow cylinder (7). A first servo motor (8) is fixedly installed at the bottom of the hollow cylinder (7). A power assembly located on a circular tube (1) and used to drive the soft auger (10) to rotate.

2. The feed pipe of a grain drying tower according to claim 1, characterized in that: The power assembly includes a protective shell (3), which is fixedly installed at the bottom of the round tube (1). A second servo motor (12) is fixedly installed inside the protective shell (3). The output shaft of the second servo motor (12) passes through the round tube (1) and is fixedly installed with a fixing column (11). The two ends of the fixing column (11) are respectively fixedly connected to the two ends of the soft auger (10).

3. The feed pipe of a grain drying tower according to claim 2, characterized in that: Wheels are rotatably mounted on both sides of the protective shell (3), and the output shaft of the second servo motor (12) is rotatably connected to the round tube (1).

4. The feed pipe of a grain drying tower according to claim 2, characterized in that: The two ends of the fixed column (11) are respectively welded tightly to the two ends of the soft auger (10).

5. The feed pipe of a grain drying tower according to claim 1, characterized in that: The output shaft of the first servo motor (8) passes through the hollow cylinder (7) and is tightly welded to the fan blade (13). Several ventilation holes are opened at the bottom of the hollow cylinder (7).

6. The feed pipe of a grain drying tower according to claim 1, characterized in that: The diameter of the holes on the filter plate (14) is smaller than the particle size of common grains.

7. The feed pipe of a grain drying tower according to claim 1, characterized in that: A bracket (9) is fitted on the round tube (1) and located on one side of the fitting (5), and two wheels are rotatably mounted on the bottom of the bracket (9).

8. The feed pipe of a grain drying tower according to claim 1, characterized in that: The circular tube (1) has an inclined structure, and the feed hopper (2) is connected to the circular tube (1).

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