A drying device for making traditional Chinese medicine decoction pieces

Abstract

The application discloses a drying device for preparing traditional Chinese medicine decoction pieces, which comprises a drying box, a controller, an air source heat pump and a driving mechanism. A plurality of spiral drying assemblies are arranged in the drying box. Each spiral drying assembly comprises a rotating shaft arranged coaxially, a spiral blade sleeved on the rotating shaft and a cylinder fixed to the drying box. The cylinder wall is provided with air permeation holes, and the top of the cylinder is provided with a through hole with an air permeation cylinder. The air permeation cylinder extends into the cylinder and is in avoidance cooperation with the spiral blade. The through hole is connected with an air inlet pipe with an air inlet fan. The plurality of spiral drying assemblies are connected in series through a discharging pipe. The uppermost end assembly is communicated with a feeding pipe, and the lowermost end assembly is connected with a discharging pipe. The air source heat pump is connected with a coil pipe at the bottom of the drying box. A humidity sensor is arranged at the front end of an exhaust pipe at the top of the drying box, and the rear end of the exhaust pipe extends to the evaporator of the air source heat pump. An air exhaust fan is arranged in the exhaust pipe. The rotating shaft is connected with the external driving mechanism through a transmission mechanism. A bottom fan is arranged at the bottom of the drying box. The humidity sensor, the air exhaust fan and the driving mechanism are electrically connected with the controller.

Description

Technical Field

[0001] This invention relates to the field of drying technology for Chinese herbal medicine slices, and more specifically to a drying apparatus for producing Chinese herbal medicine slices. Background Technology

[0002] Traditional Chinese medicine (TCM) decoction pieces refer to finished products made from raw medicinal materials that have undergone specific processing such as cleaning, cutting, or roasting. These products can be directly used in TCM clinical prescriptions or preparations. They are a crucial link in the TCM industry chain, bridging the gap between raw materials and finished products. Drying is a critical and common process for TCM decoction pieces. The core purpose of drying is to quickly and evenly remove excess moisture from the pieces, thereby inhibiting microorganisms, preventing component decomposition, maintaining shape and color, facilitating storage and transportation, stabilizing quality, and extending shelf life. It is a key process to ensure the safety, efficacy, stability, and controllability of TCM decoction pieces.

[0003] Most sliced ​​Chinese medicinal herbs have a dense tissue structure, resulting in high resistance to moisture diffusion from the inside out and a slow drying speed. In traditional hot air drying rooms / ovens, if drying is too fast and the drying time is too short, it can easily lead to a situation where the outside is dry but the inside is still moist, causing surface hardening. If the drying temperature is too high, it can easily lead to charring and browning (Maillard reaction). Therefore, it is necessary to use medium to low temperatures for a long time to achieve uniform drying during the initial stage. This results in a long drying time and high energy consumption in the early stage (continuous dehumidification and a large amount of heat being wasted).

[0004] Therefore, a drying device for producing Chinese herbal medicine slices is designed to shorten the drying time in the early stage and reduce energy consumption while ensuring the drying effect. Summary of the Invention

[0005] The purpose of this invention is to provide a drying apparatus for producing Chinese herbal medicine slices, so as to solve the problems described in the background art.

[0006] The technical solution of this invention is implemented as follows: A drying apparatus for producing traditional Chinese medicine decoction pieces includes a drying chamber, a controller, an air source heat pump, and an external drive mechanism. The air source heat pump has a hot water outlet, a cold water inlet, and an evaporator. An exhaust pipe is also provided outside the drying chamber. The front end of the exhaust pipe is connected to the top of the drying chamber and is equipped with a humidity sensor. The rear end of the exhaust pipe extends to the evaporator of the air source heat pump. An exhaust fan is also provided in the exhaust pipe. Both the humidity sensor and the exhaust fan are electrically connected to the controller. The top of the drying chamber is also equipped with a feed pipe for introducing medicinal material slices. The drying chamber also contains multiple spiral drying components, spaced apart from top to bottom. Each spiral drying component includes a cylinder, a rotating shaft, spiral blades, a venting cylinder, an air inlet pipe, and an air inlet fan. The two ends of the rotating shaft are rotatably mounted on the side walls of the drying chamber. The two ends of the cylinder have closed surfaces, and the cylinder wall has several second vent holes. The cylinder wall is also fixedly connected to the inner wall of the drying chamber by a connecting rod. The rotating shaft is coaxial with the cylinder and rotates through the closed surfaces at both ends of the cylinder. The spiral blades are spirally wound around the rotating shaft and have several first vent holes. The top of the cylinder wall also has several spaced-apart through holes. The bottom of the venting cylinder is closed, and the top of the venting cylinder is fixed in one of the through holes. The spiral blades extend downwards into the cylinder, with corresponding clearance grooves on the spiral blades to avoid the air vent. The bottom of the air inlet pipe is connected to the through hole, and the air inlet fan is located at the top of the air inlet pipe. The cylinder of the uppermost spiral drying assembly is connected to the feed pipe, and the cylinder of the lowermost bolt drying assembly is also connected to a discharge pipe that exits the drying chamber. The upper and lower adjacent cylinders are also connected through the discharge pipe, thus connecting the multiple cylinders in series. This allows the medicinal slices to flow sequentially from top to bottom through all the cylinders, with opposite flow directions in adjacent cylinders. The rotating shaft outside the cylinder is also equipped with a drive wheel or drive wheel set. The upper and lower adjacent rotating shafts are driven by the drive wheel or drive wheel set. One end of one of the multiple rotating shafts rotates out of the side wall of the drying chamber and is driven by an external drive mechanism. The drying chamber is also equipped with a bottom fan, and a coil is installed above the bottom fan. The two ends of the coil are connected to the hot water outlet and the cold water inlet, respectively.

[0007] When using the above method, the air source heat pump is set to a drying temperature, which is generally between 43℃ and 48℃. The herbal slices are added to the drying chamber through the feed pipe. The external drive mechanism is then activated, causing the connected shaft to rotate. This shaft, through a transmission wheel or transmission wheel assembly, drives other shafts to rotate simultaneously. Driven by the spiral blades, the herbal slices move from one end of the cylinder to the other and fall from the discharge pipe into the adjacent lower cylinder. Finally, the herbal slices are continuously conveyed and transferred from the uppermost cylinder to the lowermost cylinder and discharged from the discharge pipe, completing the initial drying of the herbal slices.

[0008] In this process, hot water supplied by the air source heat pump flows into the coil through the hot water outlet, and the bottom fan continuously blows air upwards to diffuse the heat in the coil into the entire drying chamber. By opening multiple second vents on the cylinder wall, hot air can quickly enter the cylinder through the second vents to dry the medicinal slices. The first vent on the spiral blades also provides a channel for the circulation of hot air in the cylinder. The setting of the first and second vents increases the heat exchange rate between the medicinal slices and the hot air in the cylinder, accelerating the drying efficiency.

[0009] Meanwhile, by setting up a venting cylinder and a clearance groove, the medicinal slices are agitated as they pass through the venting cylinder, preventing them from sticking together due to moisture removal. During the agitation process, a fan blows hot air from inside the drying chamber into the venting cylinder, and the hot air flows out through the cylinder wall to dry the passing medicinal slices. The venting cylinder further increases the exchange rate between the medicinal slices and the hot air inside the cylinder, further accelerating the drying efficiency, while also preventing the medicinal slices from sticking together due to moisture.

[0010] Under normal circumstances, as the temperature and humidity inside the drying chamber increase, the air pressure inside the chamber also increases. The hot and humid gas will automatically and preferentially exit through the exhaust pipe. However, the dehumidification efficiency is uncontrollable; excessive humidity will lead to a decrease in drying efficiency. Therefore, a humidity sensor and an exhaust fan are installed in the exhaust pipe. When the humidity sensor detects that the humidity exceeds a set threshold, the controller activates the exhaust fan to force ventilation into the drying chamber, quickly expelling some of the hot and humid gas to reduce the air humidity inside the drying chamber and improve the drying efficiency of the medicinal herb slices. Simultaneously, the expelled hot and humid gas is guided to the evaporator of the air source heat pump, thereby reducing the operating power of the air source heat pump and saving energy.

[0011] The setup of multiple spiral drying components allows more medicinal herb slices to be dried simultaneously and continuously, achieving continuous feeding and discharging, and improving the overall drying efficiency of the medicinal herb slices.

[0012] Under the combined effect of the above-mentioned drying structures, this device can reduce the drying time and energy consumption of Chinese herbal medicine pieces by improving drying efficiency and reducing the operating power of the heat source, while ensuring the drying effect.

[0013] A further technical solution is that the air intake pipe includes a connecting pipe and an air guide tube. The air guide tube is a frustum-shaped cylinder with openings at the top and bottom. The diameter of the upper opening of the air guide tube is larger than the diameter of the lower opening. The air guide tube is located inside the connecting pipe. The edge of the upper opening of the air guide tube is sealed to the inner wall of the connecting pipe. The connecting pipe is sealed to the cylinder wall and covers the outside of the through hole. The lower opening of the air guide tube is connected to the top of the ventilator. The air intake fan is connected to the top of the connecting pipe.

[0014] When using the above scheme, the installation of the air guide tube and the inlet fan is facilitated by setting up the connecting pipe. By setting up the air guide tube, the airflow generated by the inlet fan can be gathered and sent into the air vent, increasing the air velocity entering the air vent, improving the blowing effect of the air vent, and thus improving the heat exchange efficiency of the medicinal material slices.

[0015] A further technical solution is that the external drive mechanism includes a motor bracket, a drive motor, a drive wheel, and a driven wheel. One end of the uppermost of the multiple rotating shafts is rotatably inserted through the side wall of the drying chamber and extends outward to connect with the driven wheel. The motor bracket is fixed to the outer wall of the drying chamber, the drive motor is fixed to the motor bracket, the drive wheel is located on the output shaft of the drive motor, and the drive wheel is driven by the driven wheel.

[0016] When using the above scheme, the drive motor drives the driving wheel to rotate, the driving wheel drives the driven wheel to rotate, and the driven wheel drives the rotating shaft to rotate.

[0017] A further technical solution is that a transmission wheel is fixedly sleeved on the uppermost and lowermost rotating shafts among the multiple rotating shafts, and two transmission wheels are fixedly sleeved on the rotating shaft between the uppermost and lowermost rotating shafts among the multiple rotating shafts, thus forming a transmission wheel group. The transmission wheels on the upper and lower adjacent rotating shafts drive each other, so that the multiple rotating shafts rotate in the same direction, and the spiral directions of the spiral blades on the upper and lower adjacent rotating shafts are opposite to each other.

[0018] When using the above scheme, the uppermost drive wheel drives one of the drive wheels in the adjacent lower drive wheel group to rotate. This drive wheel drives its corresponding shaft to rotate, and the shaft in turn drives another drive wheel in the traditional wheel group to rotate, and so on, driving all the shafts to rotate in sequence from top to bottom.

[0019] A further technical solution is that a fan bracket is fixed at the bottom of the drying oven, the bottom fan is located at the top of the fan bracket, a grid frame is fixed inside the drying oven, the grid frame is located above the bottom fan, and the coil is located on the grid frame.

[0020] When using the above solution, the bottom fan is supported by setting a fan bracket, and the coil is supported by setting a grid frame.

[0021] A further technical solution is to provide a spiral wear-resistant strip at the edge of the spiral blade, which slides and fits against the inner wall of the cylinder.

[0022] When using the above solution, by setting a spiral wear-resistant sliding strip at the edge of the spiral blade, the structural strength of the spiral blade can be increased on the one hand, and the contact between the spiral blade and the cylinder wall can be more stable and the sliding connection can be smoother, thus avoiding the jamming of the medicinal material slices and causing breakage.

[0023] A further technical solution is that the transmission wheel is a belt pulley.

[0024] A further technical solution is that the rotating shaft, spiral blades, cylinder, and spiral wear-resistant slide are all made of polytetrafluoroethylene plastic.

[0025] When using the above solution, the shaft, helical blade, cylinder and helical wear-resistant strip made of polytetrafluoroethylene plastic have better friction and lubrication characteristics.

[0026] A further technical solution is that the multiple through holes are arranged at equal intervals.

[0027] The beneficial effects of this invention are as follows: 1. Improved Drying Efficiency: A well-designed air-source heat pump heating temperature (43℃-48℃), combined with spiral blades moving the herbal slices and the placement of the first and second vents, increases the heat exchange rate between the herbal slices and hot air inside the cylinder, accelerating drying. The vents agitate the herbal slices, preventing them from sticking together, while a fan blows hot air into the vents, further enhancing the heat exchange rate and drying efficiency.

[0028] 2. Controllable dehumidification efficiency: A humidity sensor and exhaust fan are installed in the exhaust pipe. When the humidity exceeds the threshold, the exhaust fan is activated to force ventilation, quickly expel hot and humid gas, reduce the air humidity inside the drying chamber, and improve drying efficiency.

[0029] 3. Energy saving: The discharged hot and humid gas is guided to the evaporator of the air source heat pump, reducing the operating power of the air source heat pump.

[0030] 4. Enables continuous operation: The setup of multiple spiral drying components allows more medicinal herb slices to be dried simultaneously and continuously, achieving continuous feeding and discharging, and improving overall drying efficiency.

[0031] 5. Optimized structural design: The connecting pipe facilitates the installation of the air guide tube and the inlet fan. The air guide tube can concentrate the airflow and send it into the ventilation tube, increasing the air velocity and improving the blowing effect and heat exchange efficiency.

[0032] 6. A spiral wear-resistant sliding strip is set on the edge of the spiral blade to increase the structural strength, so that the spiral blade can make stable contact with the cylinder wall and slide smoothly, avoiding the slicing of medicinal materials from getting stuck and breaking. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 Top view.

[0034] In the diagram, 1. Drying oven, 2. Air source heat pump, 3. Fan bracket, 4. Bottom fan, 5. Grid frame, 6. Coil, 7. Exhaust pipe, 8. Humidity sensor, 9. Exhaust fan, 10. Feed pipe, 11. Cylinder, 12. Shaft, 13. Spiral blade, 14. Feed pipe, 15. Discharge pipe, 16. Motor bracket, 17. Drive motor, 18. Drive wheel, 19. Driven wheel, 20. Transmission wheel, 21. Spiral wear-resistant slide bar, 22. First vent, 23. Through hole, 24. Ventilation cylinder, 25. Connecting pipe, 26. Air guide duct, 27. Inlet fan, 28. Second vent, 29. Clearance groove, 30. Connecting rod. Detailed Implementation

[0035] To better understand the technical content of this invention, specific embodiments are provided below, and the invention will be further described in conjunction with the accompanying drawings.

[0036] See Figures 1 to 3 A drying device for producing Chinese herbal medicine slices includes a rectangular drying chamber 1, a controller, an air source heat pump 2, and an external drive mechanism.

[0037] Specifically, the controller uses an STM32 microcontroller or a SMART200 PLC controller.

[0038] Air source heat pump 2 is a commonly used air source heat pump 2 in the prior art. It outputs heat source by outputting hot water. Air source heat pump 2 has hot water outlet, cold water inlet and evaporator. These are the conventional structure of air source heat pump 2. The arrangement of hot water outlet, cold water inlet and evaporator will not be described in detail here.

[0039] The drying chamber 1 is also equipped with an exhaust pipe 7. The front end of the exhaust pipe 7 is connected to the top of the drying chamber 1 and is equipped with a humidity sensor 8. The rear end of the exhaust pipe 7 extends to the evaporator of the air source heat pump 2. An exhaust fan 9 is also installed in the exhaust pipe 7. Both the humidity sensor 8 and the exhaust fan 9 are electrically connected to the controller.

[0040] The top of the drying chamber 1 is also provided with a feed pipe 10 for introducing medicinal material slices. The drying chamber 1 is also provided with five spiral drying components, which are arranged at equal intervals from top to bottom.

[0041] The spiral drying assembly includes a cylinder 11, a rotating shaft 12, spiral blades 13, an air vent 24, an air inlet pipe, and an air inlet fan 27.

[0042] Preferably, the rotating shaft 12, the spiral blade 13, and the cylinder 11 are all made of polytetrafluoroethylene plastic.

[0043] The two ends of the rotating shaft 12 are rotatably mounted on the side wall of the drying chamber 1. The two ends of the cylinder 11 are provided with closed surfaces. The cylinder wall of the cylinder 11 is provided with several second vent holes 28. The cylinder wall of the cylinder 11 is also fixedly connected to the inner wall of the drying chamber 1 by a connecting rod 30.

[0044] The rotating shaft 12 is coaxially arranged with the cylinder 11, and the rotating shaft 12 rotates through the closed surfaces at both ends of the cylinder 11.

[0045] The spiral blade 13 is spirally wound on the rotating shaft 12, and a number of first vent holes 22 are opened on the spiral blade 13.

[0046] Preferably, a spiral wear-resistant slide 21 is also provided at the edge of the spiral blade 13, and the spiral wear-resistant slide 21 slides and fits against the inner wall of the cylinder 11.

[0047] Preferably, the spiral wear-resistant slide 21 is made of polytetrafluoroethylene plastic.

[0048] The top of the cylinder wall of the cylinder 11 is also provided with a number of equally spaced through holes 23. The bottom of the ventilator 24 is closed, and the top of the ventilator 24 is fixed in the through holes 23 and extends downward into the cylinder 11.

[0049] A clearance groove 29 is provided on the corresponding position of the spiral blade 13 to avoid the air vent 24.

[0050] The bottom of the intake pipe is connected to the through hole 23, and the intake fan 27 is located at the top of the intake pipe.

[0051] Specifically, the air intake pipe includes a connecting pipe 25 and an air guide duct 26. The air guide duct 26 is a frustum-shaped cylinder with openings at the top and bottom. The diameter of the upper opening of the air guide duct 26 is larger than the diameter of the lower opening. The air guide duct 26 is located inside the connecting pipe 25. The edge of the upper opening of the air guide duct 26 is sealed to the inner wall of the connecting pipe 25. The connecting pipe 25 is sealed to the cylinder wall of the cylinder 11 and covers the outside of the through hole 23. The lower opening of the air guide duct 26 is connected to the top of the ventilator 24. The air intake fan 27 is connected to the top of the connecting pipe 25.

[0052] The cylinder 11 of the uppermost spiral drying assembly is connected to the feed pipe 10, and the cylinder 11 of the lowermost bolt drying assembly is also connected to the discharge pipe 15 that extends out of the drying chamber 1.

[0053] The adjacent cylinders 11 are also connected by a feed pipe 14, so that the five cylinders 11 are connected in series, and the medicinal slices can flow through all the cylinders 11 from top to bottom, and the flow direction is opposite in adjacent cylinders 11.

[0054] A drive wheel 20 or a drive wheel set is also provided on the rotating shaft 12 outside the cylinder 11. The upper and lower adjacent rotating shafts 12 are driven by the drive wheel 20 or the drive wheel set. One end of one of the multiple rotating shafts 12 rotates out of the side wall of the drying oven 1 and is driven by the external drive mechanism.

[0055] Specifically, the external drive mechanism includes a motor bracket 16, a drive motor 17, a drive wheel 18, and a driven wheel 19. One end of the uppermost of the five rotating shafts 12 is rotatably inserted into the side wall of the drying chamber 1 and extends outward to connect with the driven wheel 19. The motor bracket 16 is fixed to the outer wall of the drying chamber 1, the drive motor 17 is fixed to the motor bracket 16, the drive wheel 18 is located on the output shaft of the drive motor 17, and the drive wheel 18 is driven by the driven wheel 19.

[0056] Preferably, both the driving wheel 18 and the driven wheel 19 are engaged with gears, and the driving wheel 18 and the driven wheel 19 are meshed.

[0057] Specifically, a transmission wheel 20 is fixedly fitted on the uppermost and lowermost of the five rotating shafts 12, and two transmission wheels 20 are fixedly fitted on the three rotating shafts 12 between the uppermost and lowermost rotating shafts 12, thus forming a transmission wheel group. The transmission wheels 20 on the upper and lower adjacent rotating shafts 12 drive each other, so that multiple rotating shafts 12 rotate in the same direction. The spiral directions of the spiral blades 13 on the upper and lower adjacent rotating shafts 12 are opposite to each other.

[0058] Preferably, the transmission wheel 20 is a belt pulley, and the two corresponding transmission wheels 20 are connected by a belt.

[0059] The bottom of the drying oven 1 is also fixed with a fan bracket 3, the upper end of the fan bracket 3 is equipped with a bottom fan 4, the upper part of the bottom fan 4 is also fixed with a grid frame 5, the upper end of the grid frame 5 is equipped with a coil 6, and the two ends of the coil 6 are connected to the hot water outlet and the cold water inlet, respectively.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drying apparatus for producing traditional Chinese medicine decoction pieces, comprising a drying chamber, a controller, an air source heat pump, and an external drive mechanism, wherein the air source heat pump has a hot water outlet, a cold water inlet, and an evaporator; an exhaust pipe is also provided outside the drying chamber, the front end of the exhaust pipe is connected to the top of the drying chamber and is equipped with a humidity sensor, the rear end of the exhaust pipe extends to the evaporator of the air source heat pump, and an exhaust fan is also provided in the exhaust pipe; both the humidity sensor and the exhaust fan are electrically connected to the controller, characterized in that: The top of the drying chamber is also equipped with a feed pipe for introducing medicinal material slices. The drying chamber also contains multiple spiral drying components, spaced apart from top to bottom. Each spiral drying component includes a cylinder, a rotating shaft, spiral blades, a venting cylinder, an air inlet pipe, and an air inlet fan. The two ends of the rotating shaft are rotatably mounted on the side walls of the drying chamber. The two ends of the cylinder have closed surfaces, and the cylinder wall has several second vent holes. The cylinder wall is also fixedly connected to the inner wall of the drying chamber by a connecting rod. The rotating shaft is coaxial with the cylinder and rotates through the closed surfaces at both ends of the cylinder. The spiral blades are spirally wound around the rotating shaft and have several first vent holes. The top of the cylinder wall also has several spaced-apart through holes. The bottom of the venting cylinder is closed, and the top of the venting cylinder is fixed in one of the through holes. The spiral blades extend downwards into the cylinder, with corresponding clearance grooves on the spiral blades to avoid the air vent. The bottom of the air inlet pipe is connected to the through hole, and the air inlet fan is located at the top of the air inlet pipe. The cylinder of the uppermost spiral drying assembly is connected to the feed pipe, and the cylinder of the lowermost bolt drying assembly is also connected to a discharge pipe that exits the drying chamber. The upper and lower adjacent cylinders are also connected through the discharge pipe, thus connecting the multiple cylinders in series. This allows the medicinal slices to flow sequentially from top to bottom through all the cylinders, with opposite flow directions in adjacent cylinders. The rotating shaft outside the cylinder is also equipped with a drive wheel or drive wheel set. The upper and lower adjacent rotating shafts are driven by the drive wheel or drive wheel set. One end of one of the multiple rotating shafts rotates out of the side wall of the drying chamber and is driven by an external drive mechanism. The drying chamber is also equipped with a bottom fan, and a coil is installed above the bottom fan. The two ends of the coil are connected to the hot water outlet and the cold water inlet, respectively.

2. The drying apparatus for producing traditional Chinese medicine decoction pieces according to claim 1, characterized in that: The air intake pipe includes a connecting pipe and an air guide tube. The air guide tube is a frustum-shaped cylinder with openings at the top and bottom. The diameter of the upper opening of the air guide tube is larger than the diameter of the lower opening. The air guide tube is located inside the connecting pipe. The edge of the upper opening of the air guide tube is sealed to the inner wall of the connecting pipe. The connecting pipe is sealed to the cylinder wall and covers the outside of the through hole. The lower opening of the air guide tube is connected to the top of the ventilator. The air intake fan is connected to the top of the connecting pipe.

3. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 2, characterized in that: The external drive mechanism includes a motor bracket, a drive motor, a drive wheel, and a driven wheel. One end of the uppermost of the multiple rotating shafts is rotatably inserted through the side wall of the drying chamber and extends outward to connect with the driven wheel. The motor bracket is fixed to the outer wall of the drying chamber, the drive motor is fixed to the motor bracket, and the drive wheel is located on the output shaft of the drive motor. The drive wheel and the driven wheel are driven together.

4. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 3, characterized in that: A transmission wheel is fixedly fitted on the uppermost and lowermost shafts among the multiple shafts. Two transmission wheels are fixedly fitted on the shaft between the uppermost and lowermost shafts among the multiple shafts, thus forming a transmission wheel group. The transmission wheels on the upper and lower adjacent shafts drive each other, so that the multiple shafts rotate in the same direction. The spiral directions of the spiral blades on the upper and lower adjacent shafts are opposite to each other.

5. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 1, characterized in that: A fan bracket is also fixed at the bottom of the drying oven, and the bottom fan is located at the top of the fan bracket. A grid frame is also fixed inside the drying oven, located above the bottom fan, and the coil is located on the grid frame.

6. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 1, characterized in that: The edge of the spiral blade is also provided with a spiral wear-resistant strip, which slides and fits against the inner wall of the cylinder.

7. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 4, characterized in that: The transmission wheel is a belt pulley.

8. A drying apparatus for producing prepared slices of traditional Chinese medicine according to claim 6, characterized in that: The rotating shaft, spiral blades, cylinder, and spiral wear-resistant slide are all made of polytetrafluoroethylene plastic.

9. A drying apparatus for producing prepared slices of traditional Chinese medicine according to any one of claims 1-8, characterized in that: The multiple through holes are arranged at equal intervals.

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