Energy-saving and efficient drying process for Chinese herbal medicine slices

Abstract

The present invention relates to an energy-saving and efficient drying process for Chinese herbal medicine slices, which belongs to the technical field of Chinese herbal medicine slice production and comprises the following processes: S1: spreading washed and drained Chinese herbal medicine slices on a draining net and controlling the initial weight of the Chinese herbal medicine slices in each draining net to be the same; S2: a plurality of draining nets are stacked and evenly distributed in a drying room, and a control system monitors the weight change of the draining nets during the drying process; S3: starting the drying room, and the control system drives the drying room to blow out dry air in different directions according to the weight change of a plurality of draining nets in different areas of the drying room; the present application realizes the effect of fast and efficient drying of Chinese herbal medicine slices in all areas in a large drying room by dividing the areas and using intelligent means to complete air hedging, and achieves energy-saving effect by improving drying uniformity and optimizing drying time, effectively solving the problems of low drying efficiency and high energy consumption of Chinese herbal medicine slices.

Description

Technical Field

[0001] The invention belongs to the technical field of production of Chinese medicinal slices, and particularly relates to an energy-saving and high-efficiency drying process for Chinese medicinal slices. Background Art

[0002] The processing technology is a crucial step in the production of Chinese herbal medicine slices, directly impacting their quality and efficacy. Traditional Chinese herbal medicine slice processing typically includes pretreatment, preheating, drying, cooling, and packaging. The drying step is crucial for removing excess moisture from the slices and ensuring they are stored in a stable state.

[0003] In actual production, Chinese herbal medicine slices are washed to remove impurities before being processed and then laid out on drying boards for drying. For large-scale Chinese medicine companies, the output of Chinese herbal medicine slices is usually very high, so large quantities of Chinese herbal medicine slices need to be placed in large drying equipment for drying.

[0004] However, the use of large-scale drying equipment also presents a series of problems. Due to the large internal space of the equipment, the vertical density of the drying boards is relatively high, and the drying points of the drying equipment are usually fixed. This results in uneven heat distribution during the drying process. Some pieces of Chinese herbal medicine may be under-dried due to being too far from the drying point, while others may be over-dried due to being too close to the drying point.

[0005] To address this issue, companies often extend drying times to ensure that all TCM pieces achieve the desired drying results. However, this practice not only increases energy consumption but can also lead to inconsistent quality and even compromise efficacy. Furthermore, prolonged drying can lead to a loss of active ingredients in the pieces, further reducing their quality.

[0006] Therefore, a drying process for Chinese herbal medicine slices that reduces energy consumption and improves drying efficiency is needed. Summary of the Invention

[0007] In order to solve the above-mentioned problems existing in the prior art, the present invention provides an energy-saving and efficient drying process for Chinese herbal medicine slices, which solves the problem that enterprises often need to extend the drying time of existing large-scale drying equipment to ensure that all Chinese herbal medicine slices can achieve the ideal drying effect, thereby increasing energy consumption.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] An energy-saving and efficient drying process for Chinese herbal medicine slices, comprising the following processes:

[0010] S1: Spread the washed and drained Chinese herbal medicine slices on a draining net and control the initial weight of the Chinese herbal medicine slices in each draining net to be the same;

[0011] S2: A plurality of drain nets are stacked and evenly distributed in the drying room, and a control system monitors the weight change of the drain nets during the drying process;

[0012] S3: Starting the drying room, the control system drives the drying room to blow dry air in different directions according to the weight changes of the drain nets in different areas of the drying room;

[0013] S301: In the initial stage, the front air is blown out of the drying room so that the first-level drying air directly acts on the front of the draining net to dry the Chinese herbal medicine slices at the rear end;

[0014] S302: In the middle stage, the side air is blown out of the drying room, and the first-level drying air is directly applied to the side of the draining net to dry the Chinese herbal medicine slices on the side;

[0015] S303: In the later stage, the secondary drying air from the front of the drying room is blown out to counteract the primary drying air from the side, and the primary drying air from the side is counteracted to the front to dry the Chinese herbal medicine slices at the front until drying is completed.

[0016] Preferably, the side air is blown out by the left fan blade and the right fan blade arranged on the side of the drying room; the front air is blown out by the rear fan blade arranged on the rear side of the drying room.

[0017] Preferably, the wind force of the secondary drying air is greater than the wind force of the primary drying air.

[0018] Preferably, the humidity of the primary drying air is maintained between 20% RH and 40% RH, and the humidity of the secondary drying air is maintained between 30% RH and 50% RH.

[0019] Preferably, the temperature of the secondary drying air is lower than the temperature of the primary drying air.

[0020] Preferably, S2 further comprises the following steps:

[0021] S201: Divide the drying room into several drying zones, each drying zone is provided with a weight detection system, and the weight detection system is used to detect the weight of the Chinese herbal medicine slices in the corresponding drying zone;

[0022] S202: The control system divides the drying areas into strong areas and weak areas according to the weight value changes of the drying areas during the baking process;

[0023] S203: When it is monitored that the drying progress of the strong zone reaches 70%, the second-level dry air is output to the strong zone, and the first-level dry air is output to the weak zone.

[0024] Preferably, the control system is provided with several first weight thresholds, and the several weight thresholds correspond to the drying weights of several drying areas; the control system is also provided with a second weight threshold, and the second weight threshold is taken as the average value of the total value of all first weight thresholds. The first weight threshold is used to judge the drying progress of the current drying area, and the second weight threshold is used to adjust the parameters of the secondary drying air.

[0025] Preferably, the heights of the left fan blade, the right fan blade and the rear fan blade are higher than the installation height of the drain net.

[0026] Preferably, a circulating air system is further provided inside the drying room for discharging moisture generated during the drying process and introducing new dry air.

[0027] Preferably, the drying room realizes air exchange through a surface cooler, and the surface cooler is connected to a control system of the drying room for automatically adjusting the working state of the surface cooler.

[0028] The beneficial effects of the present invention are:

[0029] In the initial stage, high-intensity, high-temperature frontal air can quickly take away a large amount of moisture; in the middle stage, the effect of side air makes the drying more in-depth; in the later stage, the counter-air ensures that the front-end slices can also achieve the ideal drying effect, thereby realizing the comprehensive and efficient drying of Chinese herbal medicine slices. By dividing the areas and using intelligent means to complete air counter-flow, it is possible to achieve the effect of fast and efficient drying of Chinese herbal medicine slices in all areas in large drying rooms. By improving the uniformity of drying and optimizing the drying time, energy-saving effects are achieved, which not only reduces the company's energy consumption costs, but also improves the quality and drying efficiency of Chinese herbal medicine slices. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0031] Figure 1 A flow chart of a drying process for Chinese herbal medicine slices provided in one embodiment of the present invention;

[0032] Figure 2 A control schematic diagram of a control system provided in one embodiment of the present invention;

[0033] Figure 3 This is a structural diagram of a drying room provided in one embodiment of the present invention;

[0034] Figure 4 This is a schematic cross-sectional structural diagram of a drying room provided in one embodiment of the present invention;

[0035] Figure 5A schematic diagram of an airflow counterbalancing structure provided in one embodiment of the present invention;

[0036] Markings: 1. Drying room; 2. Drain net; 31. Left fan blade; 32. Right fan blade; 33. Rear fan blade; 5. Surface cooler. DETAILED DESCRIPTION

[0037] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0038] like Figure 1-Figure 5 As shown, an energy-saving and efficient drying process for Chinese herbal medicine slices includes the following processes:

[0039] S1: Spread the washed and drained Chinese herbal medicine slices on the draining net 2 and control the initial weight of each Chinese herbal medicine slice on the draining net 2 to be the same. Factors such as the moisture content, thickness, and density of the Chinese herbal medicine slices directly affect their drying rate. Unifying the initial weight helps the control system more accurately predict and regulate the drying process, reducing energy waste caused by individual differences. This ensures that the Chinese herbal medicine slices on each draining net 2 have consistent initial conditions, facilitating uniform heating and water evaporation during the subsequent drying process. By controlling the initial weight, differences in drying efficiency caused by uneven weight of the slices can be avoided, thereby improving the uniformity and efficiency of the overall drying process.

[0040] S2: Several draining nets 2 are stacked and evenly distributed in the drying room 1. A control system monitors weight changes during the drying process. Weight changes are a direct reflection of water evaporation. Through real-time monitoring, the control system can quickly respond and adjust the drying intensity or direction to avoid over-drying or under-drying, thereby saving energy. The stacked arrangement ensures efficient use of the drying space. Furthermore, by monitoring weight changes in real time, the control system can accurately determine the moisture loss of the slices, providing data support for dynamic adjustment of drying strategies.

[0041] S3: Start the drying room 1. The control system drives the drying room 1 to blow out dry air in different directions according to the weight changes of several draining nets 2 in different areas of the drying room 1, realizing intelligent management of the drying process. By dynamically adjusting the flow direction and intensity of the dry air, the medicinal pieces in different positions are accurately dried, which greatly improves the drying efficiency and energy utilization rate.

[0042] S301: In the initial stage, the drying room 1 blows out front air, so that the first-level drying air directly acts on the front of the draining net 2 to dry the Chinese herbal medicine slices at the rear end. The direct action of the hot air promotes the rapid evaporation of moisture on the surface of the slices. The parts at the rear end that may be relatively moist due to stacking are treated first to ensure that the overall drying progress is balanced; in the initial stage, the front air directly acts on the surface of the slices, and the convection effect of the hot air is used to quickly take away the moisture on the surface of the slices.

[0043] S302: In the middle stage, the drying room 1 blows out side air, and the first-level drying air is directly applied to the side of the drain net 2 to dry the Chinese herbal medicine pieces located on the side. The introduction of side air effectively solves the problem of insufficient side drying caused by the stacking of the pieces. Through the penetration of side air, the internal moisture is accelerated to diffuse outward, and the drying uniformity is improved.

[0044] S303: In the later stage, the secondary drying air blown out from the front of the drying room 1 is offset against the primary drying air from the side, and the primary drying air from the side is offset to the front to dry the Chinese herbal medicine slices at the front until the drying is completed. The offset airflow not only enhances the water evaporation rate of the front slices, but also optimizes the airflow distribution in the drying room through the aerodynamic effect, making the drying more uniform and efficient.

[0045] In a large drying space, since the Chinese herbal medicines are stacked on the multi-layer draining net 2 and distributed in the drying room 1, the traditional single-direction drying often cannot ensure that the Chinese herbal medicines distributed in the drying room 1 can be dried efficiently and thus achieve energy-saving effects, thereby reducing costs for the enterprise; the present invention uses a hedging method to adjust the direction of the drying air at different stages, thereby achieving multi-angle and all-round drying of the medicine slices, and uses a hedging method to dynamically adjust the direction and intensity of the drying air, making the drying process more flexible and efficient.

[0046] In the initial stage, high-intensity, high-temperature frontal air can quickly take away a large amount of moisture; in the middle stage, the effect of side air makes the drying more in-depth; in the later stage, the counter-air ensures that the front-end slices can also achieve the ideal drying effect, thereby realizing the comprehensive and efficient drying of Chinese herbal medicine slices. By dividing the areas and using intelligent means to complete air counter-flow, it is possible to achieve the effect of fast and efficient drying of Chinese herbal medicine slices in all areas in a large drying room 1. By improving the uniformity of drying and optimizing the drying time, significant energy-saving effects are achieved, which not only reduces the company's energy consumption costs, but also improves the quality and drying efficiency of Chinese herbal medicine slices.

[0047] In one embodiment, the side air is blown out by the left and right blades 31 and 32 arranged on the side of the drying room 1. These two blades can be controlled independently. According to the weight changes of the drain net 2 in different areas monitored by the control system, the rotation speed and wind direction of the blades are adjusted, thereby achieving effective drying of the side slices. The introduction of side air helps to solve the problem of insufficient side drying caused by the stacking of slices and improves the uniformity of drying. The front air is blown out by the rear blades 33 arranged on the rear side of the drying room 1. The rear blades 33 can also adjust the rotation speed and wind direction according to the instructions of the control system to meet the needs of different drying stages. In the initial stage, the front air blown out by the rear blades 33 can directly act on the rear end slices, quickly taking away the moisture on their surface and inside. In the later stage, the rear blades 33 cooperate with the side blades to blow out secondary dry air to counteract the primary dry air on the side, further enhancing the drying effect.

[0048] The coordination of side air and front air makes the air flow in the drying chamber more uniform, avoids drying dead corners caused by stacking, and improves drying uniformity. This helps to ensure that all Chinese herbal medicines can achieve the ideal drying effect and reduce energy waste caused by uneven drying. By precisely controlling the speed and wind direction of the fan blades, the air flow can be dynamically adjusted according to the needs of different drying stages, thereby optimizing the drying time. This avoids the problems of excessive energy consumption and low drying efficiency caused by long-term, single-direction drying in traditional drying methods.

[0049] In one embodiment, the wind force of the secondary drying air is greater than that of the primary drying air. In the later stage of the drying process, an innovative hedging strategy is adopted, that is, the secondary drying air in the front and the primary drying air on the side form a hedge in the drying room 1. By adjusting the air flow direction and wind force, full utilization and efficient circulation of the air in the drying room are achieved. Specifically, the secondary drying air is blown out from the back side of the drying room 1 with a stronger wind force and a stronger flushing force, while the primary drying air on the side is blown out through the left fan blade 31 and the right fan blade 32 with a moderate wind force, which is mainly used to maintain stable temperature and humidity in the drying room.

[0050] When the secondary dry air and the primary dry air collide, they form a powerful airflow within the drying chamber, directing the primary dry air from the side to the front, directly affecting the Chinese medicinal slices located in front. During this collision, the high-speed flow of the secondary dry air not only enhances air flow in the front area of the slices but also increases the air renewal rate, quickly removing any residual moisture from the slices' surfaces. Simultaneously, the primary dry air is redistributed during the collision, avoiding the problem of insufficient or excessive drying in certain areas and ensuring uniform air utilization within the drying chamber.

[0051] The hedging strategy makes air flow in the drying chamber more efficient, accelerating the evaporation rate of moisture on the surface of the slices, thereby shortening the drying time and improving drying efficiency. By adjusting the flow direction and wind speed of the primary and secondary drying air, the air in the drying chamber is evenly distributed and efficiently utilized. This helps avoid the problem of insufficient or excessive drying in some areas and improves the uniformity of drying.

[0052] In one embodiment, the humidity of the primary drying air is maintained between 20% RH and 40% RH, and the humidity of the secondary drying air is maintained between 30% RH and 50% RH. During the drying process, there is a difference in the evaporation rate of water inside and on the surface of the slices. The primary drying air has a lower humidity and mainly removes water from the surface of the front Chinese medicine slices. The secondary drying air has a higher humidity, which can prevent the excessive evaporation of water inside the slices caused by the low humidity in the drying room 1 during the hedging process. This humidity gradient setting helps maintain the stability of the environment in the baking room. Reasonable settings of the humidity of the primary and secondary drying air help maintain the stability of the temperature and humidity in the entire baking room, thereby ensuring the smooth progress of the drying process.

[0053] In summary, maintaining air humidity between 20% and 40% RH in the primary drying stage and 30% to 50% RH in the secondary drying stage plays a crucial role in counter-drying the Chinese medicinal pieces at the front end and maintaining the drying progress throughout the drying room. This humidity setting not only promotes uniform water evaporation and improves drying efficiency, but also maintains a stable environment within the drying room, optimizing the drying process.

[0054] In one embodiment, the temperature of the secondary drying air is lower than that of the primary drying air. The primary drying air and the secondary drying air form convection in the drying chamber, which promotes the transfer and distribution of heat. The high temperature heat of the primary drying air is transferred to the medicinal slices through heat conduction, accelerating the evaporation of moisture on their surface; while the low temperature of the secondary drying air helps to maintain the stability of the internal temperature of the medicinal slices, preventing quality loss due to excessive temperature. During the drying process, the moisture on the surface of the medicinal slices continuously evaporates into the air, and the water vapor in the air will also condense on the surface of the medicinal slices at a lower temperature. The temperature difference between the primary and secondary drying air helps to maintain this balance between evaporation and condensation, so that the medicinal slices maintain an appropriate moisture content during the drying process.

[0055] In one embodiment, S2 further includes the following steps:

[0056] S201: Divide the drying room 1 into several drying zones, each of which is provided with a weight detection system for detecting the weight of the Chinese herbal medicine pieces in the corresponding drying zone;

[0057] S202: The control system divides several drying areas into strong areas and weak areas according to the weight value changes in the drying areas during the baking process; the strong areas refer to areas where the weight of the medicinal slices decreases faster and the drying progress is relatively advanced; while the weak areas refer to areas where the weight of the medicinal slices decreases slower and the drying progress is relatively lagging behind.

[0058] S203: When it is monitored that the drying progress of the strong area reaches 70%, the secondary dry air is output to the strong area, and the primary dry air is output to the weak area; when the control system monitors that the drying progress of the strong area reaches a preset threshold (such as 70%), the drying strategy is automatically adjusted: the secondary dry air with higher humidity and lower temperature is output to the strong area to maintain the balanced evaporation of moisture inside the medicinal pieces and avoid over-drying; and the primary dry air with lower humidity and higher temperature continues to be output to the weak area to accelerate the removal of residual moisture and improve drying efficiency.

[0059] Furthermore, the formation of the weak zone is related to the position of the air outlet, so it is necessary to output the dry air to the weak zone by hedging, that is, the left fan blade 31 and the right fan blade 32 are the side wind group, and the rear fan blade 33 is the positive wind group. According to the weight change characteristics, the side wind group is selected as the output end of the first-level dry air, and then the positive wind group is used as the hedging end to output the second-level dry air, which is responsible for hedging the dry air to the weak zone; conversely, if the positive wind group is used as the output end of the dry air, then the side wind resistance is used as the second-level dry output end to hedging the first-level dry air to the weak zone;

[0060] This embodiment achieves refined management of the drying process through the subdivision and weight detection of drying zones. Implementing differentiated drying strategies for areas with different drying progress not only ensures drying efficiency but also improves drying uniformity, avoiding localized over- or under-drying. This differentiated drying strategy effectively avoids unnecessary energy waste. In the later stages of drying, the more aggressive zones with faster drying progress are treated with gentler secondary drying air, reducing energy consumption. Meanwhile, the more efficient primary drying air continues to be used in the less aggressive zones with slower drying progress, ensuring overall drying efficiency.

[0061] In one embodiment, the control system is provided with a plurality of first weight thresholds, and the plurality of weight thresholds correspond to the drying weights of the plurality of drying areas. The first weight threshold is used to judge the drying progress of the current drying area. The plurality of first weight thresholds can be used to dry different Chinese herbal medicine slices, so that when a plurality of Chinese herbal medicine slices are dried in the same drying room 1, intelligent monitoring can be realized and the drying progress of the corresponding Chinese herbal medicine slices can be judged to make a reference to the second weight threshold, so that the control system can adjust the drying environment of the entire drying room 1 according to the second threshold, so that different Chinese herbal medicine slices are in a relatively balanced drying environment;

[0062] The control system is also provided with a second weight threshold, which takes the average value of the total value of all first weight thresholds. The control system calculates the average value of the sum of all first weight thresholds to obtain the second weight threshold, which is used to evaluate the overall drying progress and serve as the basis for adjusting the secondary drying air parameters. When the overall drying progress reaches or exceeds the second weight threshold, the control system starts the parameter adjustment logic, and makes the drying environment of the entire drying room 1 more balanced through parameters such as temperature, humidity and flow in the drying room 1, ensuring that different Chinese herbal medicines can be dried under optimal conditions.

[0063] In one embodiment, the height of the left fan blade 31, the right fan blade 32 and the rear fan blade 33 are installed higher than the height of the drain net 2, which can ensure that the airflow will not be obstructed when passing through the drain net 2, so that it can flow more smoothly to every corner, which helps to reduce the eddy current and turbulence of the airflow near the drain net 2, improve the uniformity and stability of the airflow, and further reduce the weight change of Chinese herbal medicines due to wind speed; in addition, when the height of the fan blades is higher than the drain net 2, the airflow can pass through the drain net 2 more effectively, taking away heat and moisture, thereby improving the drying efficiency of the Chinese herbal medicines.

[0064] In one embodiment, a circulating air system is further provided inside the drying room 1 for discharging moisture generated during the drying process and introducing new dry air. The circulating air system is mainly composed of a fan, an air duct, an exhaust port and an air inlet. During the drying process, after the fan is started, the wet air in the drying room 1 is extracted through the air duct and discharged to the external environment through the exhaust port; at the same time, new dry air is introduced into the drying room 1 through the air inlet, forming a continuous air circulation. The circulation process not only helps to quickly discharge the moisture generated during the drying process, but also ensures that the air in the drying room 1 always remains dry, thereby improving the drying efficiency and quality.

[0065] In one embodiment, the drying room 1 achieves air exchange through the surface cooler 5, and the surface cooler 5 is connected to the control system of the drying room 1, and is used to automatically adjust the working state of the surface cooler 5 according to the weight of the drain net 2; the automatic adjustment system of the surface cooler 5 can intelligently adjust the cooling intensity according to the actual load changes during the drying process, thereby realizing efficient and flexible temperature and humidity management. This adaptive ability helps to improve drying efficiency while reducing unnecessary energy consumption; further, during the entire drying process, the drying room 1 is also equipped with temperature and humidity sensors, which continuously monitor and record the temperature and humidity data in the drying room 1. The control system will compare the real-time monitored temperature and humidity data with the preset target values to ensure that the temperature and humidity in the drying room 1 are always maintained within the optimal range.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An energy-saving and efficient drying process for Chinese herbal medicine slices, characterized in that: Including the following processes: S1: Spread the washed and drained Chinese herbal medicine slices on a draining net and control the initial weight of the Chinese herbal medicine slices in each draining net to be the same; S2: A plurality of drain nets are stacked and evenly distributed in the drying room, and a control system monitors the weight change of the drain nets during the drying process; S3: Starting the drying room, the control system drives the drying room to blow dry air in different directions according to the weight changes of the drain nets in different areas of the drying room; S301: In the initial stage, the front air is blown out of the drying room so that the first-level drying air directly acts on the front of the draining net to dry the Chinese herbal medicine slices at the rear end; S302: In the middle stage, the side air is blown out of the drying room, and the first-level drying air is directly applied to the side of the draining net to dry the Chinese herbal medicine slices on the side; S303: In the later stage, the secondary drying air from the front of the drying room is blown out to counteract the primary drying air from the side, and the primary drying air from the side is counteracted to the front to dry the Chinese herbal medicine slices at the front until drying is completed.

2. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The side air is blown out by the left fan blade and the right fan blade arranged on the side of the drying room; the front air is blown out by the rear fan blade arranged on the rear side of the drying room.

3. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The wind force of the secondary dry air is greater than the wind force of the primary dry air.

4. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The humidity of the primary drying air is maintained between 20% RH and 40% RH, and the humidity of the secondary drying air is maintained between 30% RH and 50% RH.

5. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The temperature of the secondary drying air is lower than that of the primary drying air.

6. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: S2 also includes the following steps: S201: Divide the drying room into several drying zones, each drying zone is provided with a weight detection system, and the weight detection system is used to detect the weight of the Chinese herbal medicine slices in the corresponding drying zone; S202: The control system divides the drying areas into strong areas and weak areas according to the weight value changes of the drying areas during the baking process; S203: When it is monitored that the drying progress of the strong zone reaches 70%, the second-level dry air is output to the strong zone, and the first-level dry air is output to the weak zone.

7. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 6, characterized in that: The control system is provided with several first weight thresholds, each of which corresponds to the drying weight of several drying areas; the control system is also provided with a second weight threshold, which is the average value of the total value of all first weight thresholds. The first weight threshold is used to judge the drying progress of the current drying area, and the second weight threshold is used to adjust the parameters of the secondary drying air.

8. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 2, characterized in that: The heights of the left fan blade, the right fan blade and the rear fan blade are higher than the installation height of the drain net.

9. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The drying room is also provided with a circulating air system for discharging moisture generated during the drying process and introducing new dry air.

10. The energy-saving and efficient drying process for Chinese herbal medicine slices according to claim 1, characterized in that: The drying room realizes air exchange through a surface cooler, and the surface cooler is connected to a control system of the drying room for automatically adjusting the working state of the surface cooler.

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