Energy-saving and efficient drying process for traditional Chinese medicine decoction pieces

Abstract

The invention relates to an energy-saving efficient drying process for traditional Chinese medicine decoction pieces, and belongs to the technical field of traditional Chinese medicine decoction piece production. The energy-saving efficient drying process comprises the following steps that S1, the cleaned and drained traditional Chinese medicine decoction pieces are spread on draining nets, and the initial weights of the traditional Chinese medicine decoction pieces in the draining nets are controlled to be the same; s2, a plurality of draining nets are stacked and uniformly distributed in a drying room, and the weight change of the draining nets in the drying process is monitored by a control system; s3, the drying room is started, 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; air hedging is completed through regional division and intelligent means, the effect of rapidly and efficiently drying the traditional Chinese medicine decoction pieces in all regions in a large drying room is achieved, the energy-saving effect is achieved by improving the drying uniformity and optimizing the drying time, and the energy-saving effect is achieved. The problems that the traditional Chinese medicine decoction pieces are low in drying efficiency and high in energy consumption are effectively solved.

Description

Technical Field

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

[0002] In the production process of Chinese herbal medicine slices, the processing technology is a crucial link, which is directly related to the quality and efficacy of Chinese herbal medicine slices. The traditional processing technology of Chinese herbal medicine slices usually includes pretreatment, preheating, drying, cooling and packaging. Among them, the drying step is the key link to ensure that the Chinese herbal medicine slices remove excess moisture and achieve a stable storage state.

[0003] In actual production, Chinese herbal medicine slices need to be washed with water to remove impurities before processing, and then laid on a drying board for drying. For large-scale Chinese medicine companies, the output of Chinese herbal medicine slices is usually very high, so a large number of Chinese herbal medicine slices need to be placed in large-scale drying equipment for drying.

[0004] However, the use of large-scale drying equipment also brings a series of problems. Due to the large internal space of the equipment, the vertical density of the drying boards in the drying equipment 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 may be under-dried because they are far away from the drying point, while other pieces may be over-dried because they are close to the drying point.

[0005] To solve this problem, companies often need to extend the drying time to ensure that all Chinese herbal medicines can achieve the ideal drying effect. However, this practice not only increases energy consumption, but may also lead to unstable quality of Chinese herbal medicines and even affect the efficacy. In addition, long drying time may also cause the loss of active ingredients in Chinese herbal medicines, further reducing their quality.

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

[0007] In order to solve the above 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 pieces on a draining net and control the initial weight of the Chinese herbal medicine pieces 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, and the control system drives the drying room to blow out dry air in different directions according to the weight changes of a plurality of draining 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 drain net to dry the Chinese herbal medicine pieces at the rear end;

[0014] S302: In the middle stage, the side air is blown out from the drying room, and the primary drying air is directly applied to the side of the draining net to dry the Chinese herbal medicine pieces located 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 in the front until the drying is completed.

[0016] Preferably, the side air is blown out by left and right fan blades arranged on the sides of the drying room; and the front air is blown out by rear fan blades 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 dry air is maintained between 20% RH and 40% RH, and the humidity of the secondary dry 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 a plurality of drying areas, each drying area is provided with a weight detection system, and the weight detection system is used to detect the weight of the Chinese herbal medicine pieces in the corresponding drying area;

[0022] S202: The control system divides the plurality of 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 values ​​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 dry air.

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

[0026] Preferably, a circulating air system is also provided inside the drying room to discharge moisture generated during the drying process and introduce 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 hedging air ensures that the front-end pieces can also achieve the ideal drying effect, thereby realizing the comprehensive and efficient drying of Chinese herbal medicines. By dividing the areas and using intelligent means to complete air hedging, it is possible to achieve the effect of fast and efficient drying of Chinese herbal medicines 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 medicines. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order 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 flowchart of a drying process for Chinese medicinal pieces 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 schematic diagram of the structure of a drying room provided in one embodiment of the present invention;

[0034] Figure 4 It 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 counteracting 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 explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, 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 the Chinese herbal medicine slices in each 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 to more accurately predict and regulate the drying process and reduce energy waste caused by individual differences; ensuring that the Chinese herbal medicine slices on each draining net 2 have consistent initial conditions, which is convenient for uniform heating and water evaporation in the subsequent drying process. By controlling the initial weight, the difference in drying efficiency caused by uneven weight of the slices can be avoided, thereby improving the uniformity and efficiency of the overall drying.

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

[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 drain nets 2 in different areas of the drying room 1, thereby realizing intelligent management of the drying process. By dynamically adjusting the flow direction and intensity of the dry air, accurate drying is performed according to the status of the slices in different positions, greatly improving 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 effect of the hot air promotes the rapid evaporation of moisture on the surface of the slices. The relatively moist parts at the rear end due to stacking are treated first to ensure the overall balanced drying progress. 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 herbal medicine pieces. Through the penetration of side air, the internal moisture is accelerated to diffuse outward, thereby improving the drying uniformity.

[0044] S303: In the later stage, the secondary drying air blown out from the front of the drying room 1 is offset with 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 evaporation rate of the water in 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 is often difficult to ensure that the Chinese herbal medicines distributed in the drying room 1 can be dried efficiently and thus achieve energy saving, thereby reducing costs for the enterprise. The present invention uses a hedging method to adjust the direction of the drying air at different stages to achieve multi-angle and all-round drying of the herbal medicines. The hedging method is used 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 drying more in-depth; in the later stage, the hedging air ensures that the front-end pieces can also achieve the ideal drying effect, thereby realizing the comprehensive and efficient drying of Chinese herbal medicines. By dividing the areas and using intelligent means to complete air hedging, it is possible to achieve the effect of fast and efficient drying of Chinese herbal medicines 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 medicines.

[0047] In one embodiment, the side air is blown out by the left blade 31 and the right blade 32 arranged on the side of the drying room 1. The two blades can be controlled independently. According to the weight change of the drain net 2 in different areas monitored by the control system, the rotation speed and wind direction of the blades are adjusted, so as to achieve effective drying of the side slices. The introduction of the side air helps to solve the problem of insufficient side drying caused by the stacking of slices and improve the uniformity of drying. The front air is blown out by the rear blade 33 arranged on the rear side of the drying room 1. The rear blade 33 can also adjust the rotation speed and wind direction according to the command of the control system to meet the needs of different drying stages. In the initial stage, the front air blown out by the rear blade 33 can directly act on the rear end slices and quickly take away the moisture on its surface and inside. In the later stage, the rear blade 33 cooperates with the side blades to blow out the secondary drying air to counteract the primary drying 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 room 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 at the front and the primary drying air at the side form a hedging 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 larger wind force and a stronger flushing force, while the primary drying air at 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 the temperature and humidity in the drying room stable;

[0050] When the secondary dry air and the primary dry air collide, they form a strong airflow in the drying room, guiding the primary dry air on the side to the front and directly acting on the Chinese herbal medicine pieces in front. During the collision process, the high-speed airflow of the secondary dry air not only enhances the air flow in the front area of ​​the pieces, but also increases the air renewal rate, so that the residual moisture on the surface of the pieces can be quickly taken away. At the same time, the primary dry air is redistributed during the collision process, avoiding the problem of insufficient or excessive local drying, and realizing the uniform use of air in the drying room.

[0051] The hedging strategy makes the air flow in the drying room more efficient, speeds up the evaporation rate of the surface water of the slices, thus shortening the drying time and improving the drying efficiency. By adjusting the flow direction and wind force of the primary and secondary drying air, the air in the drying room is evenly distributed and efficiently utilized. This helps to 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 dry air is maintained between 20%RH and 40%RH, and the humidity of the secondary dry 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 dry air has a lower humidity, and mainly removes the water on the surface of the front Chinese medicine slices; while the secondary dry air has a higher humidity, which can prevent the excessive evaporation of water inside the slices due to 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 dry 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, the primary drying air humidity is maintained between 20%RH and 40%RH, and the secondary drying air humidity is maintained between 30%RH and 50%RH, which plays a vital role in air counter-drying the Chinese herbal medicine pieces at the front end and maintaining the drying progress of the entire baking room. This humidity setting not only promotes the uniform evaporation of water and improves the drying efficiency, but also maintains the stability of the environment in the baking room and optimizes the drying process.

[0054] In one embodiment, the temperature of the secondary dry air is lower than that of the primary dry air. The primary dry air and the secondary dry air form convection in the drying chamber, which promotes the transfer and distribution of heat. The high temperature heat of the primary dry 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 dry air helps to maintain the stability of the internal temperature of the medicinal slices and prevent 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 also condenses on the surface of the medicinal slices at a lower temperature. The temperature difference between the primary and secondary dry 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 a plurality of drying areas, each drying area is provided with a weight detection system, and the weight detection system is used to detect the weight of the Chinese herbal medicine pieces in the corresponding drying area;

[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 area refers to the area where the weight of the medicinal pieces decreases faster and the drying progress is relatively advanced; while the weak area refers to the area where the weight of the medicinal pieces decreases slower and the drying progress is relatively lagging.

[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 blade 31 and the right blade 32 are the side wind group, and the rear 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. Then, the positive wind group is used as the hedging end to output the second-level dry air and is responsible for hedging the dry air to the weak zone; on the contrary, 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 subdivision and weight detection of drying areas. Differentiated drying strategies are implemented for areas with different drying progress, which not only ensures drying efficiency, but also improves drying uniformity, avoids the problem of local over- or under-drying, and effectively avoids unnecessary energy waste. In the later stage of drying, milder secondary drying air is used for strong areas with faster drying progress, reducing energy consumption; while for weak areas with slower drying progress, efficient primary drying air continues to be used to ensure 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 a 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 dry different Chinese herbal medicines, so that when drying a plurality of Chinese herbal medicines in the same drying room 1, intelligent monitoring can be realized and the drying progress of the corresponding Chinese herbal medicines 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 medicines are in a relatively balanced drying environment;

[0062] 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 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 a 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 through the parameters such as temperature, humidity and flow of the drying room 1, the drying environment of the entire drying room 1 is made more balanced, ensuring that different Chinese herbal medicines can be dried under optimal conditions.

[0063] In one embodiment, the heights of the left blade 31, the right blade 32 and the rear 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 to every corner more smoothly, which helps to reduce the eddy 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 the 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 also 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 humid 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 in the drying process, so as to achieve efficient and flexible temperature and humidity management. This adaptive ability helps to improve the 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, and 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 only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall 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 pieces on a draining net and control the initial weight of the Chinese herbal medicine pieces 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, and the control system drives the drying room to blow out dry air in different directions according to the weight changes of a plurality of draining 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 drain net to dry the Chinese herbal medicine pieces at the rear end; S302: In the middle stage, the side air is blown out from the drying room, and the primary drying air is directly applied to the side of the draining net to dry the Chinese herbal medicine pieces located 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 in the front until the 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 dry air is maintained between 20% RH and 40% RH, and the humidity of the secondary dry 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 a plurality of drying areas, each drying area is provided with a weight detection system, and the weight detection system is used to detect the weight of the Chinese herbal medicine pieces in the corresponding drying area; S202: The control system divides the plurality of 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, 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 values ​​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 blade, the right blade and the rear 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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