Feeding device

Abstract

The application relates to a feeding device, which comprises a feeding roller rotatably arranged around an axis, the feeding roller being provided with an inlet, a liquid inlet and an outlet; and a detection assembly comprising a moisture discharge pipe, a wind speed detection member and a moisture detection member, the moisture discharge pipe being communicated with the outlet, and the wind speed detection member and the moisture detection member being arranged in the moisture discharge pipe; the wind speed detection member is used for detecting the gas flow rate in the moisture discharge pipe; and the moisture detection member is used for detecting the moisture content of the gas in the moisture discharge pipe. The gas flow rate in the moisture discharge pipe can be measured by the wind speed detection member, and the moisture content of the gas in the moisture discharge pipe can be measured by the moisture detection member. The total moisture discharged in a certain period of time can be calculated according to the gas flow rate, the moisture content and the pipe diameter of the moisture discharge pipe. The feeding device can be used for real-time detection of the moisture loss amount in the feeding process of tobacco leaves, timely adjustment of process parameters in the production process, and effective control of the moisture change in the feeding process.

Description

Technical Field

[0001] This application relates to the field of tobacco processing technology, and in particular to a feeding device. Background Technology

[0002] The tobacco leaf processing step is a crucial step in improving tobacco leaf quality. It involves accurately and evenly spraying prepared sugar solutions or other flavorings onto the tobacco leaves to improve flavor, aroma, moisture retention, and mold prevention, thereby enhancing cigarette quality. Accurately detecting the amount of moisture loss from the tobacco leaves during this processing step is of great significance for controlling product quality and optimizing processing techniques.

[0003] Currently, the main methods for detecting moisture in tobacco leaves are indirect methods, such as the drying method. The amount of moisture loss is calculated by subtracting the moisture content measured after drying from the amount of moisture applied.

[0004] However, the above-mentioned detection methods cannot achieve real-time and rapid detection of moisture loss, making it difficult to meet the need for timely adjustment of process parameters during production. This results in the inability to effectively control moisture changes during the feeding process, thereby affecting the final quality of tobacco leaves. Utility Model Content

[0005] Based on this, this application provides a feeding device to solve the problem that feeding devices in related technologies cannot perform online detection of moisture loss.

[0006] This application provides a feeding device, which includes: a feeding roller rotatably arranged around its own axis, the feeding roller being provided with a feed inlet, a liquid inlet, and a discharge outlet; and a detection component including a dehumidification pipe, an air velocity detector, and a moisture detector, the dehumidification pipe being connected to the discharge outlet, and both the air velocity detector and the moisture detector being disposed in the dehumidification pipe; the air velocity detector being used to detect the gas flow rate in the dehumidification pipe; and the moisture detector being used to detect the moisture content of the gas in the dehumidification pipe.

[0007] In one embodiment, the moisture detection device includes an infrared detector.

[0008] In one embodiment, the detection assembly further includes a sampling tube, one end of which is connected to a desiccant pipe, and the extension direction of the sampling tube and the extension direction of the desiccant pipe are at an angle; a moisture detection element is disposed on the sampling tube and is connected to the inner cavity of the sampling tube.

[0009] In one embodiment, the outer periphery of the sampling tube is covered with an insulation layer.

[0010] In one embodiment, the detection assembly further includes at least one first dryer containing a desiccant, the first dryer being disposed within a dehumidification pipe and located downstream of the sampling pipe.

[0011] In one embodiment, the detection assembly includes a plurality of first dryers, each containing a desiccant, the plurality of first dryers being spaced apart along the extension direction of the exhaust pipe, and the plurality of first dryers being located downstream of the sampling pipe; and / or, the detection assembly further includes a drying tube, the extension direction of the drying tube being at an angle to the extension direction of the exhaust pipe, one end of the drying tube being connected to at least one first dryer, and the other end of the drying tube being connected to a drying gas source.

[0012] In one embodiment, the detection component further includes a desiccant fan disposed in a desiccant pipe.

[0013] In one embodiment, the feeding device further includes a discharge vibrating trough and a second dryer. The discharge vibrating trough is disposed at the discharge port, and the dehumidification pipe is connected to the discharge vibrating trough. The second dryer is disposed in the discharge vibrating trough and is located downstream of the dehumidification pipe.

[0014] In one embodiment, the feeding device further includes a feeding vibrating trough disposed at the feeding inlet; and / or, the feeding device further includes a liquid nozzle and a moisture nozzle disposed at the liquid inlet.

[0015] In one embodiment, the feeding device further includes a circulation pipe and a circulation fan. One end of the circulation pipe is set to the inlet and connected to the feeding roller, and the other end of the circulation pipe is set to the outlet and connected to the feeding roller. The circulation fan is set in the circulation pipe.

[0016] Using the technical solution of this application, tobacco leaves are added to the feeding drum through the inlet, and liquid and moisture are added to the feeding drum through the liquid inlet. By rotating the feeding drum around its own axis, the tobacco leaves, liquid, and moisture can be uniformly mixed within the feeding drum, ensuring that the liquid and moisture are evenly distributed on the tobacco leaves. The fed tobacco leaves are discharged through the outlet, while unabsorbed moisture and liquid are discharged from the outlet in atomized form. Since the dehumidification pipe is connected to the outlet, the atomized moisture and liquid enter the dehumidification pipe. A wind speed detector can measure the gas flow rate in the dehumidification pipe, and a moisture detector can measure the moisture content of the gas in the dehumidification pipe. By using the gas flow rate, moisture content, and the diameter of the dehumidification pipe, the total amount of moisture discharged within a certain period of time can be calculated. This feeding device can detect the amount of moisture loss in real time during the feeding process of tobacco leaves, allowing for timely adjustment of process parameters during production, thereby effectively controlling moisture changes in the feeding process and improving the quality of the tobacco leaves. Attached Figure Description

[0017] Figure 1 A schematic diagram of the feeding device provided in an embodiment of this application is shown.

[0018] Explanation of reference numerals in the attached figures:

[0019] 10. Feeding roller; 20. Detection assembly; 21. Exhaust pipe; 22. Wind speed detector; 23. Moisture detector; 24. Sampling tube; 241. Insulation layer; 25. Desiccant; 26. First dryer; 27. Exhaust fan; 30. Discharge vibrating trough; 40. Feed vibrating trough; 50. Liquid nozzle; 60. Moisture nozzle; 70. Circulation pipe; 80. Circulation fan. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0026] See Figure 1 , Figure 1 A schematic diagram of the feeding device provided in an embodiment of this application is shown. One embodiment of this application provides a feeding device including a feeding roller 10 and a detection component 20. The feeding roller 10 is rotatably arranged around its own axis and has a feed inlet, a liquid inlet, and a discharge outlet. The detection component 20 includes a desiccant pipe 21, a wind speed detector 22, and a moisture detector 23. The desiccant pipe 21 is connected to the discharge outlet. Both the wind speed detector 22 and the moisture detector 23 are disposed in the desiccant pipe 21. The wind speed detector 22 is used to detect the gas flow rate within the desiccant pipe 21. The moisture detector 23 is used to detect the moisture content of the gas within the desiccant pipe 21.

[0027] Using the technical solution of this application, tobacco leaves are added into the feeding roller 10 through the feed inlet, and liquid and water are added into the feeding roller 10 through the liquid inlet. By rotating the feeding roller 10 around its own axis, the tobacco leaves, liquid, and water can be uniformly mixed within the feeding roller 10, ensuring that the liquid and water are evenly distributed on the tobacco leaves. The fed tobacco leaves are discharged through the discharge outlet, while unabsorbed water and liquid are discharged from the discharge outlet in atomized form. Since the dehumidification pipe 21 is connected to the discharge outlet, the atomized water and liquid enter the dehumidification pipe 21. The gas velocity in the dehumidification pipe 21 can be measured using the wind speed detector 22, and the moisture content of the gas in the dehumidification pipe 21 can be measured using the moisture detector 23. The total amount of moisture discharged within a certain period of time can be calculated using the gas velocity, moisture content, and diameter of the dehumidification pipe 21. This feeding device can detect the amount of moisture loss in real time during the feeding process of tobacco leaves, and adjust the process parameters in a timely manner during production, thereby effectively controlling the moisture changes in the feeding process and improving the quality of tobacco leaves.

[0028] It should be noted that the feeding device provided in this application can be used not only for calculating the moisture loss during the tobacco leaf feeding process, but also for calculating the moisture loss during the tobacco stem feeding process.

[0029] The calculation process for moisture loss during tobacco feeding is as follows: Let V be the gas flow velocity in the exhaust pipe 21, D be the pipe diameter of the exhaust pipe 21, c be the moisture concentration of the discharged gas measured by the moisture detector 23, and Q be the moisture loss during the feeding process within time period T. Based on the above parameters and the following formula... The amount of moisture lost during the feeding process.

[0030] In some embodiments, the feeding device further includes a frame, on which the feeding roller 10 is mounted and driven by a drive structure, allowing it to rotate around its own axis. The axis of the feeding roller 10 is inclined in the direction from its inlet to its outlet, enabling the tobacco leaves to move forward automatically during feeding without the need for an additional pushing structure. Lifting plates inside the feeding roller 10 scoop up and scatter the tobacco leaves within the roller, creating a uniform material curtain. This facilitates thorough contact between the liquid and moisture and the tobacco leaves, preventing clumping or excessive wetness in certain areas, resulting in a more effective feeding process. Of course, the inclination angle and rotational speed of the feeding roller 10 can be adjusted according to actual conditions to accommodate different types of tobacco leaves or stems.

[0031] The inclination angle of the feeding roller 10 is set differently for different types of tobacco leaves. The larger the inclination angle, the faster the material moves forward in the feeding roller 10 and the shorter the residence time in the feeding roller 10. By adjusting the inclination angle and rotation speed of the feeding roller 10, different feeding time requirements can be met for different types of tobacco leaves.

[0032] Before the feeding process of tobacco leaves, the feed liquid needs to be prepared in advance according to actual needs. The components of the feed liquid include sugar, flavoring, humectant, etc. The above components are mixed in a certain proportion, heated to a predetermined temperature, and stirred evenly before being added into the feeding drum 10 to improve the physical properties, flavor characteristics and combustion behavior of tobacco leaves.

[0033] In some embodiments, the moisture detection element 23 includes an infrared detector. Moisture detection using an infrared detector offers the advantages of accurate and rapid results.

[0034] When an infrared light source illuminates the emitted gas, moisture absorbs some of the energy, causing a decrease in the intensity of reflected or transmitted light. The higher the water content, the greater the attenuation. By converting the intensity of reflected or transmitted light into an electrical signal, the moisture concentration can be measured in real time.

[0035] Moisture concentration detection using an infrared detector can achieve millisecond-level response speed, improving the reaction speed during the feeding process and enabling rapid adjustment of moisture content. Furthermore, the detection process does not require alteration of the physical or chemical properties of the gas.

[0036] It should be noted that in actual production, portable and small-sized infrared detectors are required, and these detectors need to be calibrated regularly to ensure accurate detection results.

[0037] Combination Figure 1 As shown, the detection assembly 20 also includes a sampling tube 24, one end of which is connected to the desiccant pipe 21. The extension direction of the sampling tube 24 and the extension direction of the desiccant pipe 21 form an angle. A moisture detection element 23 is disposed in the sampling tube 24 and communicates with the inner cavity of the sampling tube 24. By using a separate sampling tube 24 to detect the moisture content of the gas, the flow rate of the gas in the sampling tube 24 can be reduced, avoiding the influence of excessively high gas flow rate on the detection results.

[0038] In some embodiments, the moisture detection element 23 is disposed at the other end of the sampling tube 24, and the sampling tube 24 can be configured as a closed structure to further reduce the velocity of the gas in the sampling tube 24. Of course, the sampling tube 24 is not a completely closed structure. In some embodiments, before the tobacco feeding process begins, the gas discharged from the outlet of the feeding roller 10 condenses in the sampling tube 24, causing condensate to accumulate in the sampling tube 24. A switch valve can be installed on the sampling tube 24 to discharge the condensate in the sampling tube 24, and the switch valve can be closed after the sampling tube 24 reaches a suitable temperature.

[0039] Compared to the diameter of the exhaust pipe 21, the sampling pipe 24 has a smaller diameter and is used only for detecting the moisture content in the gas. In some embodiments, to make the detection results more accurate, a sealing structure, such as a sealing ring, can be provided between the exhaust pipe 21 and the sampling pipe 24.

[0040] Combination Figure 1 As shown, a heat insulation layer 241 is provided around the outer periphery of the sampling tube 24. By providing the heat insulation layer 241, the sampling tube 24 can be kept warm, preventing moisture in the gas inside the sampling tube 24 from condensing after cooling and affecting the detection structure.

[0041] In some embodiments, in order to make the detection structure more accurate, the outer periphery of the dehumidification pipe 21 may also be covered with a heat insulation layer 241 to improve the heat insulation effect of the dehumidification pipe 21 and prevent moisture in the gas from condensing.

[0042] To promote the absorption of the feed liquid, accelerate its diffusion and penetration on the tobacco leaf surface, and improve the fluidity of additives such as sugars and flavorings, thereby enhancing the atomization effect of the feed liquid, the temperature inside the feeding drum 10 is generally controlled between 50℃ and 65℃. The gas discharged from the outlet is also within this temperature range. To prevent moisture in the discharged gas from condensing in the dehumidification pipe 21 and the sampling pipe 24, an insulation layer 241 is laid, which can improve the test results.

[0043] Combination Figure 1 As shown, the detection assembly 20 also includes at least one first dryer 26, which contains a desiccant 25. The first dryer 26 is located inside the desiccant pipe 21 and downstream of the sampling pipe 24. By using the first dryer 26, moisture in the air can be prevented from entering the desiccant pipe 21, thereby affecting the detection results of the moisture content in the gas and making the detection results more accurate.

[0044] In some embodiments, the detection assembly 20 includes a plurality of first dryers 26, each containing a desiccant 25. The plurality of first dryers 26 are spaced apart along the extension direction of the exhaust pipe 21, and are all located downstream of the sampling pipe 24. By employing this design, by arranging a plurality of first dryers 26 along the extension direction of the exhaust pipe 21, it is possible to prevent the first dryers 26 near the sampling pipe 24 from absorbing excessive moisture from the exhaust gas, thus preventing them from absorbing moisture from the air. Conversely, by using the first dryers 26 further away from the sampling pipe 24 to absorb moisture from the air, the detection structure becomes more accurate.

[0045] In some embodiments, the detection assembly 20 further includes a drying tube, the extension direction of which forms an angle with the extension direction of the dehumidification pipe 21. One end of the drying tube is connected to at least one first dryer 26, and the other end is connected to a drying air source. With this design, the drying air source within the drying tube can dry the desiccant 25, allowing the first dryer 26 to remain operational, absorbing moisture from the air and preventing moisture in the air from affecting the detection results.

[0046] Among them, the drying gas source can dry the desiccant. Therefore, in addition to having a certain temperature, the humidity of the drying gas source is also relatively low.

[0047] Combination Figure 1 As shown, the detection component 20 also includes a desiccant fan 27, which is installed in the desiccant pipe 21. The desiccant fan 27 can draw the gas at the outlet into the desiccant pipe 21, preventing the gas from being directly discharged from the outlet and improving the detection results of moisture content.

[0048] It should be noted that, due to the installation of the dehumidification fan 27, the negative pressure generated by the fan during operation can draw the gas discharged from the outlet into the dehumidification pipe 21. Furthermore, due to the negative pressure, air generally will not enter from the upper end of the dehumidification pipe 21 and affect the test results. However, when the gas flow rate in the dehumidification pipe 21 is low and the air humidity is high, a desiccant 25 can be used to isolate the moisture in the air to ensure more accurate test results.

[0049] In some embodiments, a distributor can also be installed inside the dehumidification pipe 21. During the dehumidification process of the dehumidification fan 27, the distributor makes the airflow more evenly distributed in the dehumidification pipe 21, so as to avoid the impact of uneven airflow distribution on the test results.

[0050] Generally, the sampling time can be selected to be once every 5 to 10 minutes, and the cumulative amount during the entire suction cycle of the dehumidification fan 27 is calculated.

[0051] Combination Figure 1As shown, the feeding device also includes a discharge vibrating trough 30 and a second dryer. The discharge vibrating trough 30 is located at the discharge port, and the dehumidification pipe 21 is connected to the discharge vibrating trough 30. The second dryer is located in the discharge vibrating trough 30 and downstream of the dehumidification pipe 21. By setting the second dryer at the discharge vibrating trough 30, moisture in the air can be prevented from entering the dehumidification pipe 21 through the discharge vibrating trough 30, thus avoiding any impact on the test results.

[0052] By incorporating the discharge vibrating trough 30, tobacco leaves adhering to the discharge port can be dislodged, preventing them from sticking to the discharge port and thus avoiding accumulation. Furthermore, the discharge vibrating trough 30 allows for the temporary storage of tobacco leaves.

[0053] In some embodiments, a desiccant hood is provided at one end of the desiccant pipe 21, and the desiccant hood covers the discharge vibrating trough 30. When the desiccant fan 27 draws, negative pressure suction can be achieved at the desiccant hood, and the large cross-sectional area of ​​the desiccant hood is used to draw the discharged moisture and sugar into the desiccant pipe 21.

[0054] It should be noted that, in order to prevent materials such as tobacco leaves from being drawn into the dehumidification hood and dehumidification pipe 21, a filter structure can be installed at the dehumidification hood to block materials such as tobacco leaves from entering the dehumidification hood.

[0055] Combination Figure 1 As shown, the feeding device also includes a feeding trough 40, which is located at the feed inlet. The feeding trough 40 can loosen the tobacco leaves at the feed inlet, preventing the tobacco leaves from clumping together and entering the feeding drum 10, thus avoiding uneven distribution.

[0056] Combination Figure 1 As shown, the feeding device also includes a liquid nozzle 50 and a moisture nozzle 60, both located at the liquid inlet. The liquid nozzle 50 atomizes the liquid and sprays it into the feeding drum 10, while the moisture nozzle 60 atomizes water and sprays it into the feeding drum 10. This increases the contact area with the tobacco leaves, making it easier for the atomized liquid and moisture to adhere to the tobacco leaves.

[0057] In some embodiments, since the feeding roller 10 is arranged in an inclined manner, the liquid nozzle 50, the water nozzle 60, the feed trough 40 and the discharge trough 30 are all arranged in an inclined manner, and the inclination angle of each of the above components is the same as the inclination angle of the axis of the feeding roller 10.

[0058] Combination Figure 1As shown, the feeding device also includes a circulation pipe 70 and a circulation fan 80. One end of the circulation pipe 70 is located at the inlet and connected to the feeding roller 10, and the other end of the circulation pipe 70 is located at the outlet and connected to the feeding roller 10. The circulation fan 80 is located in the circulation pipe 70. With the above design, the circulation fan 80 can draw hot air from the outlet of the feeding roller 10 into the circulation pipe 70 and transport it to the inlet of the feeding roller 10, thereby realizing the recycling of liquid and water in the hot air.

[0059] The circulation pipe 70 is located outside the feeding drum 10, and the direction of the circulation pipe 70 is the same as the direction of the axial extension of the feeding drum 10.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A feeding device, characterized in that, The feeding device includes: A feeding roller is rotatably arranged around its own axis, and the feeding roller is provided with a feed inlet, a liquid inlet and a discharge outlet; The detection component includes a desiccant pipe, an air velocity detector, and a moisture detector. The desiccant pipe is connected to the discharge port. Both the air velocity detector and the moisture detector are disposed in the desiccant pipe. The air velocity detector is used to detect the gas flow rate in the desiccant pipe. The moisture detector is used to detect the moisture content of the gas in the desiccant pipe.

2. The feeding device according to claim 1, characterized in that, The moisture detection device includes an infrared detector.

3. The feeding device according to claim 1, characterized in that, The detection assembly also includes a sampling tube, one end of which is connected to the desiccant, and there is an angle between the extension direction of the sampling tube and the extension direction of the desiccant; the moisture detection element is disposed on the sampling tube and is connected to the inner cavity of the sampling tube.

4. The feeding device according to claim 3, characterized in that, The sampling tube is surrounded by an insulation layer.

5. The feeding device according to claim 3, characterized in that, The detection assembly further includes at least one first dryer, which contains a desiccant and is located inside the vent pipe and downstream of the sampling pipe.

6. The feeding device according to claim 5, characterized in that, The detection assembly includes a plurality of first dryers, each of which contains the desiccant. The plurality of first dryers are spaced apart along the extension direction of the exhaust pipe, and the plurality of first dryers are all located downstream of the sampling pipe. And / or, The detection assembly further includes a drying tube, the extension direction of which forms an angle with the extension direction of the dehumidification tube, one end of which is connected to at least one of the first dryers, and the other end of which is connected to a drying gas source.

7. The feeding device according to any one of claims 1 to 6, characterized in that, The feeding device further includes a discharge vibrating trough and a second dryer. The discharge vibrating trough is located at the discharge port, and the dehumidification pipe is connected to the discharge vibrating trough. The second dryer is located in the discharge vibrating trough and downstream of the dehumidification pipe.

8. The feeding device according to any one of claims 1 to 6, characterized in that, The detection component also includes a dehumidification fan, which is disposed on the dehumidification pipe.

9. The feeding device according to any one of claims 1 to 6, characterized in that, The feeding device further includes a feeding vibrating trough, which is disposed at the feeding inlet; and / or, The feeding device further includes a liquid nozzle and a moisture nozzle, both of which are located at the liquid inlet.

10. The feeding device according to any one of claims 1 to 6, characterized in that, The feeding device further includes a circulation pipe and a circulation fan. One end of the circulation pipe is located corresponding to the feed inlet and connected to the feeding roller, and the other end of the circulation pipe is located corresponding to the discharge outlet and connected to the feeding roller. The circulation fan is located on the circulation pipe.

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