Drying device with hot air circulation and drying method thereof

Abstract

The drying device is characterized in that a discharging conveying mechanism is arranged outside a drying room, the output end of the discharging conveying mechanism is used in cooperation with a distributing conveying mechanism, and the distributing conveying mechanism is located at the output end of the discharging conveying mechanism and extends into the drying room through a channel opening formed in the drying room; the conveying device is used for conveying drying trays into a drying room; the material limiting mechanisms are located in the drying room, arranged on the two sides of the material distributing and conveying mechanism and used for limiting the drying trays located on the material distributing and conveying mechanism; and the drying chamber is used for drying the materials placed in the drying tray, a discharging opening is formed in the rear end of the drying chamber, and a sealing door is arranged at the discharging opening. The batch drying requirement can be met, the situation that multiple batch drying consumes a large amount of time and labor cost is avoided, and the drying efficiency is improved; uniform drying is realized; equipment loss is reduced and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and specifically, to a drying device with hot air circulation, especially for drying Chinese medicinal materials. Background Art

[0002] The drying of Chinese medicinal materials plays a crucial role in the processing process of Chinese medicinal materials. The quality and storage period of Chinese medicinal materials are directly related to the drying effect. In traditional Chinese medicinal material drying methods, natural drying is a relatively common way. This method mainly relies on natural climate conditions. Under sufficient sunlight and good ventilation, the moisture in the Chinese medicinal materials naturally evaporates. The traditional natural drying method, although low in cost, on the one hand, it seriously depends on weather conditions. In case of continuous rainy weather, the drying process is forced to interrupt, resulting in a significant extension of the drying cycle. For example, in the plum rain season in the south, the air humidity remains high for a long time, and it is difficult for Chinese medicinal materials to be dried within a suitable time, and they are extremely prone to mildew and deterioration, greatly affecting the quality of Chinese medicinal materials. On the other hand, natural drying takes a long time. Chinese medicinal materials are exposed to the external environment for a long time and inevitably suffer from dust and microbial contamination, which not only affects the appearance but also may change the chemical composition of Chinese medicinal materials and reduce their medicinal value.

[0003] To solve the above problems, those skilled in the art use drying equipment to replace natural drying. Existing drying equipment includes a drying box, in which an electric heating device is arranged, and the object to be dried is directly placed in the drying box for drying. Although it solves some problems of natural drying to a certain extent, on the one hand, all the objects to be dried are piled up in the drying box. During the drying process, the Chinese medicinal materials often show the situation that some parts are over-dried, the active ingredients are damaged, while some areas are under-dried and there is too much moisture residue, making it difficult to ensure the stability of the quality of Chinese medicinal materials. On the other hand, the existing drying equipment is small in volume, its internal drying space is limited, and the amount of Chinese medicinal materials that can be accommodated at one time is extremely small. A small drying box can only place a small number of Chinese medicinal material trays, which is only suitable for small-scale experiments or household use. Moreover, the trays do not have ventilation holes, affecting the drying quality. In the actual production of Chinese medicinal material processing, small equipment cannot meet the batch drying requirements. Facing a large number of Chinese medicinal materials, it can only be dried multiple times and in batches, which not only consumes a large amount of time and labor costs but also seriously affects the drying efficiency. Each drying requires re-setting parameters and monitoring the operation of the equipment, increasing the burden on operators. Frequent opening and closing of the equipment will also shorten the service life of the equipment and increase the operating costs of the enterprise. And for Chinese medicinal materials with strong seasonality, if they cannot be batch-dried in time, the Chinese medicinal materials are extremely prone to deterioration, thus bringing economic losses. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a drying device and its drying method that can solve the above problems, achieve efficient and uniform drying, can flexibly adjust drying parameters, and have the ability to batch dry.

[0005] To achieve the above object, the present invention provides a drying device with hot air circulation, including a drying chamber,

[0006] a discharging and conveying mechanism, which is arranged outside the drying chamber, and the output end of the discharging and conveying mechanism is used in cooperation with a material distributing and conveying mechanism to convey a drying tray to the material distributing and conveying mechanism;

[0007] a material distributing and conveying mechanism, which is located at the output end of the discharging and conveying mechanism and extends into the drying chamber through a channel opening formed on the drying chamber, and is used to convey the drying tray into the drying chamber;

[0008] a material limiting mechanism, which is located inside the drying chamber and arranged on both sides of the material distributing and conveying mechanism, and is used to limit the drying tray located on the material distributing and conveying mechanism;

[0009] a pushing mechanism, which is arranged outside the material distributing and conveying mechanism. After the material limiting mechanism limits the drying tray, the pushing mechanism is used to push the drying tray onto a material transferring and conveying assembly;

[0010] a material transferring and conveying assembly, which is located between the material distributing and conveying mechanism and the drying chamber, and is used to receive the drying tray conveyed by the pushing mechanism and convey it to a stacking assembly;

[0011] a stacking assembly, which is arranged outside the drying chamber and located in the first half of the drying and conveying mechanism, and is used to stack the drying trays;

[0012] The first half of the drying and conveying mechanism is located outside the drying chamber, and the second half of the drying and conveying mechanism extends into the drying chamber through a drying opening formed on the drying chamber, and is used to convey the stacked drying trays into the drying chamber;

[0013] A hatch that can be opened and closed is arranged at the drying opening;

[0014] The drying chamber is used to dry the material placed in the drying tray. An outlet is arranged at the rear end of the drying chamber, and a sealing door is arranged at the outlet;

[0015] A limiting and blocking component is arranged on both the discharging and conveying mechanism and the drying and conveying mechanism, and is used to limit the drying trays on the discharging and conveying mechanism and the drying and conveying mechanism.

[0016] Further, the drying chamber includes a drying area and a material conveying area. A top cover is provided at the top of the material conveying area. The drying chamber is located within the drying area. The material distribution and conveying mechanism, the material limiting mechanism, the material pushing mechanism, and the material transfer assembly are all located within the material conveying area. The height of the material conveying area is higher than that of the drying area. An operation walkway is provided on the outside of the material conveying area. Drying doors are provided on both sides of the operation walkway and are arranged on the material conveying area. The channel opening is formed on the left side of the material conveying area.

[0017] The discharge conveying mechanism includes a discharge rack. A number of discharge driving wheels are provided on the discharge rack. Two symmetrically arranged discharge driving wheels are connected by a connecting shaft. The discharge driving wheels are driven by a discharge motor provided on the discharge rack. The discharge driving wheels on the same side are connected by respective discharge conveyor belts. Each of the discharge conveyor belts is used to convey the drying trays. Discharge limiting bars for limiting the drying trays are provided on both upper sides of the discharge rack. Each of the discharge conveyor belts is located between the respective discharge limiting bars.

[0018] The limiting and blocking component includes a positioning plate. The positioning plate is connected to the discharge rack. A displacement seat is slidably arranged on the positioning plate. A driving cylinder is provided on the positioning plate, and its output end is connected to the displacement seat for driving the displacement seat to slide along the length direction of the positioning plate. A guiding opening is formed on the displacement seat, including an upper parallel section, an inclined section, and a lower parallel section.

[0019] A rotating cylinder is arranged within the guiding opening. A limiting disk is provided at one end of the rotating cylinder. The other end of the rotating cylinder is rotatably connected to a limiting block. The cross-section of the limiting block gradually becomes smaller from top to bottom. The limiting block is slidably connected to a first guiding post. The first guiding post is detachably connected to the positioning plate.

[0020] Further, notches are provided on both sides of the drying tray. When the limiting block rises to be located at the notch, it limits the drying tray.

[0021] Two support handles are provided at the upper end of the drying tray. Two limiting grooves are formed at the lower end of the drying tray. When the drying trays are stacked, the support handle of the lower drying tray cooperates with the limiting groove of the upper drying tray. The height of the support handle is greater than the depth of the limiting groove, so that an air inlet channel is formed between two adjacent drying trays.

[0022] A groove is provided at the upper end of the drying tray. A number of first through holes are evenly distributed in the groove. A ventilation column is provided at each of the first through holes. The cross-section of the ventilation column gradually increases from top to bottom. A second through hole penetrating the first through hole is provided at the upper end of the ventilation column. A number of openings penetrating the second through hole are provided on the outer wall of the ventilation column. Each of the openings is arranged in a circular array around the center line of the ventilation column.

[0023] Further, the material distribution and transmission mechanism includes a material distribution conveyor frame. A number of material distribution driving rollers are provided on the material distribution conveyor frame. Each of the material distribution driving rollers is connected by a material distribution transmission belt. A material distribution driving motor for driving the material distribution driving rollers to rotate is provided on the material distribution conveyor frame.

[0024] A side baffle is provided on the front side of the material distribution conveyor frame. A front baffle is provided at the front end of the front half section of the material distribution conveyor frame.

[0025] Further, the material limiting mechanism includes a support frame. The support frame is detachably connected to the material distribution conveyor frame. A sliding rod is slidably provided on the support frame. A limiting rod is provided at the inner end of the sliding rod. A positioning disk is provided outside the sliding rod. A pulley is provided outside the positioning disk. A return spring is provided between the positioning disk and the support frame.

[0026] An adjusting table is slidably provided on the support frame. The adjusting table has an inclined surface for cooperating with the pulley. The adjusting table is driven by a limiting air cylinder to adjust the position of the limiting rod.

[0027] Further, the material pushing mechanism includes a movable plate. Two frames are provided inside the movable plate. A pushing plate extending out of the frame is provided in each of the frames. Two limiting ventilation openings are provided on both sides of the drying tray. The limiting ventilation openings are not only used for hot air circulation but also cooperate with each of the pushing plates.

[0028] Two guiding rods are provided outside the movable plate. Each of the guiding rods is slidably penetrated through each positioning ear. Each of the positioning ears is detachably connected to the material distribution conveyor frame.

[0029] A propulsion air cylinder is provided inside the material distribution conveyor frame. The output end of the propulsion air cylinder extends out of the material distribution conveyor frame and is connected to a connecting column through a connecting piece. The connecting column is located between the two guiding rods and is connected to the outside of the movable plate.

[0030] Further, the material transfer and transmission assembly includes a base. A material transfer conveyor frame is provided on the base. A material transfer driving cylinder is provided on the material transfer conveyor frame. Each of the material transfer driving cylinders is connected by a connecting shaft. The material transfer

[0031] The material transfer driving cylinder is connected by a material transfer conveyor belt, and a material transfer motor for driving the rotation of the material transfer driving cylinder is arranged on the material transfer conveyor frame.

[0032] Further, the stacking assembly includes two symmetrically arranged first stacking frames and second stacking frames. A plurality of pulleys are arranged at the lower ends of the first stacking frame and the second stacking frame. The first stacking frame is sleeved on the second guiding column. The two ends of the second guiding column are respectively connected to the drying conveyor mechanism and the material distribution conveyor mechanism. The second stacking frame is threadedly sleeved on the screw rod. One end of the screw rod is rotatably connected to the drying conveyor mechanism, and the other end of the screw rod is connected to the output end of the displacement motor. The displacement motor is arranged in the installation box body, and the installation box body is located in the material distribution conveyor frame;

[0033] The material transfer conveyor assembly is located between the first stacking frame and the second stacking frame. L-shaped guiding members are arranged on the inner sides between the first stacking frame and the second stacking frame. The L-shaped guiding members are connected by a top plate. Two stacking cylinders are simultaneously arranged at the lower end of the top plate. The output ends of the stacking cylinders are respectively connected to the movable rod through respective extension members, and the movable rod is slidably connected to each L-shaped guiding member;

[0034] Extension rods are respectively arranged on both sides of the movable rod. Grabbing cylinders are hinged to the inner sides of the extension rods. The output end of the grabbing cylinder is hinged to the rear half section of the swinging member. The middle section of the swinging member is hinged to the positioning member. The upper end of the positioning member is connected to the extension rod. An arc-shaped lifting rod is arranged on the front half section of the swinging member, and the arc-shaped lifting rod is used for cooperating with the support handle;

[0035] The drying conveyor mechanism includes a drying conveyor frame, and a plurality of drying conveyor chain disks are arranged on the drying conveyor frame. The drying conveyor chain disks on the same side are respectively connected by respective drying conveyor chains;

[0036] The rear end of the hatch is slidably connected to the drying chamber. The front end of the hatch is connected to the output end of the lifting cylinder. The lifting cylinder is arranged on the support plate. The support plate is connected to the drying room. A blocking door located in the drying conveyor frame is arranged below the hatch, and the blocking door cooperates with the hatch to close the drying chamber;

[0037] The number of drying chambers is five, and each drying chamber has a limiting mechanism, a pushing mechanism, a material transfer conveyor assembly, a stacking assembly and a drying conveyor mechanism that cooperate with each other.

[0038] Further, the drying chamber is made of heat-insulating material, and the drying chamber has

[0039] A hot air circulation system: including an electric heating device, a fan and a duct;

[0040] Electric heating device: including an electric heating tube, a heat insulation mounting plate, and a temperature control component;

[0041] Electric heating tube: installed on the heat insulation mounting plate;

[0042] Heat insulation mounting plate: The heat insulation mounting plate is arranged in the drying chamber and is used to fix the electric heating tube;

[0043] Temperature control component: Composed of a thermostat and a relay, installed in the control box on the side of the drying room. The thermostat is responsible for real-time monitoring of the temperature of the electric heating tube and feeding back the data to the relay. The relay then controls the on-off of the electric heating tube according to the preset temperature value to achieve precise control of the temperature of the electric heating tube;

[0044] Fan: Used to transport the air heated by the electric heating device to the drying chamber through the air duct;

[0045] Air duct: The air duct extends from the fan outlet to the top air outlet, so that the hot air can be evenly distributed in the drying chamber. A return air outlet is arranged in the drying chamber. After the hot air passes through the medicinal materials, it carries the moisture in the medicinal materials and returns to the electric heating device from the return air outlet to realize the recycling of the hot air; improve energy utilization rate and drying uniformity;

[0046] Temperature and humidity control unit: including a temperature sensor and a humidity sensor, which respectively monitor the temperature and humidity in the drying chamber in real time. The sensors transmit the collected data to the controller, and the controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset drying parameters to achieve control of the temperature and humidity in the drying chamber.

[0047] Drying method of a drying device with hot air circulation, including:

[0048] Place the drying tray with the medicinal materials to be dried on the discharge transmission mechanism. The discharge motor drives the discharge driving wheel to rotate, driving the discharge conveyor belt to run, thereby transporting the drying tray. When the drying tray is transported to the first half of the material distribution transmission mechanism, it is limited by the side baffle and the front baffle, which can not only prevent the drying tray from falling from the material distribution transmission mechanism, but also adjust the position of the drying tray. At this time, the drying tray located behind is limited by the limit baffle component. The specific limiting method is to push the displacement seat to slide through the driving cylinder. Through the sliding of the displacement seat, the rotating cylinder at its lower parallel section moves towards the upper parallel section. As the rotating cylinder rises, its limiting block rises to the notch of the drying tray, thereby limiting the subsequent drying trays, so as to prevent multiple drying trays from piling up in the first half of the material distribution transmission mechanism;

[0049] After the drying tray is conveyed onto the material distribution and transmission mechanism, the material distribution drive motor drives the material distribution drive roller to rotate, driving the material distribution conveyor belt to convey the drying tray into the drying chamber. When it reaches the corresponding drying chamber, at this time, the material limiting mechanism limits it to prevent the drying tray from being continuously driven forward by the material distribution and transmission mechanism. The specific limiting method is to drive the adjustment table to move through the limiting air cylinder. The inclined surface of the adjustment table cooperates with the pulley, so that its sliding rod drives the limiting rod to move inward to limit the drying tray on the material distribution and transmission mechanism;

[0050] Subsequently, the drying tray is pushed towards the stacking assembly by the pushing mechanism. Specifically, the pushing air cylinder pulls the connecting piece, causing the connecting piece to drive the connecting column to move. The movement of the connecting column drives the movable plate to move. The movement of the movable plate drives the two pushing plates to move towards the drying tray. After the two pushing plates are respectively inserted into the limiting ventilation openings, the drying tray is pushed. The limiting ventilation openings can not only cooperate with the drying tray to make the pushing more stable, but also facilitate the circulation of hot air and improve the drying efficiency. The drying tray is pushed onto the transfer transmission assembly. The transfer motor drives the transfer drive cylinder to rotate, driving the transfer conveyor belt to operate, and conveying the drying tray to the stacking assembly;

[0051] The displacement motor of the stacking assembly drives the screw rod to rotate, thereby adjusting the position of the stacking assembly. Subsequently, the stacking cylinder extends, driving the movable rod to slide on the L-shaped guiding member through the extension member. Then the grasping cylinder extends, and the swinging member rotates around the positioning member, driving the arc-shaped lifting rod to move to lift the supporting handle of the drying tray. Then the stacking cylinder drives the drying tray to move upward. After the next drying tray moves to the stacking assembly, the previous drying tray is put down for stacking. Then the stacking assembly grabs the drying tray at the bottommost end to lift multiple drying trays. By repeating this operation, the stacking of several drying trays is achieved. The stacked drying trays are conveyed by the drying conveyor chain plate and chain of the drying transmission mechanism. The lifting cylinder raises the hatch, thereby transporting them into the drying chamber. When several groups of stacked drying trays are all transported into the drying chamber, the blocking door cooperates with the hatch to close the drying chamber;

[0052] The drying chamber is made of heat-insulating materials and is internally provided with a hot air circulation system and a temperature and humidity control unit. The electric heating tubes of the electric heating device are on the heat-insulating mounting plate. The temperature control component monitors and regulates the temperature of the electric heating tubes in real time. The fan conveys the heated air to the drying chamber through the air duct. The hot air is evenly distributed from the air outlet and returns to the electric heating device through the air return port for recycling. The temperature sensor and humidity sensor monitor the indoor temperature and humidity in real time. The controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset parameters to achieve drying;

[0053] After drying is completed, the sealing door is opened, and the drying transmission mechanism sends out the dried tray from the discharge port to complete the entire drying process.

[0054] The beneficial effects of the present invention are as follows:

[0055] 1) Multiple drying chambers are provided, and the drying trays can be stacked. The amount of medicinal materials that can be accommodated at one time is greatly increased, which can meet the batch drying requirements, avoid the consumption of a large amount of time and labor costs for multiple batches of drying, and improve the drying efficiency;

[0056] 2) The discharging transmission mechanism, the material distributing transmission mechanism, the material transferring transmission assembly and the drying transmission mechanism cooperate to realize the rapid conveying and accurate positioning of the drying trays; the pushing mechanism, the material limiting mechanism and the stacking assembly cooperate closely to ensure that the drying trays enter the drying chamber in an orderly manner, reduce the waiting time, and improve the overall drying efficiency;

[0057] 3) Notches are provided on both sides of the drying tray for easy limiting. There are support handles at the upper end and limiting grooves at the lower end, forming an air inlet duct during stacking; the ventilation columns and the opening design in the upper groove of the tray further promote the hot air circulation, enabling all parts of the medicinal materials to fully contact the hot air and achieving uniform drying;

[0058] 4) The temperature and humidity control unit includes a temperature sensor and a humidity sensor, which can monitor the temperature and humidity in the drying chamber in real time. The controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset drying parameters, which can meet the drying requirements of different types of medicinal materials and improve the drying accuracy and adaptability;

[0059] 5) Since the drying capacity is large, it effectively solves the problem that small drying equipment needs to be frequently turned on and off, reduces equipment wear and tear, and extends the service life of the equipment;

[0060] 6) The drying process is carried out in a closed drying chamber, reducing the risk of the medicinal materials being exposed to the external environment and being contaminated by dust and microorganisms, ensuring the hygienic quality of the medicinal materials, and avoiding the problem of the medicinal materials mildewing and deteriorating due to untimely drying. Description of the Drawings

[0061] Figure 1 is a top view structural schematic diagram of the present invention without the top cover installed.

[0062] Figure 2 is a structural schematic diagram of a specific embodiment of the present invention.

[0063] Figure 3 is Figure 2 a partial enlarged structural schematic diagram at A in

[0064] Figure 4 is another three-dimensional structural schematic diagram of the present invention.

[0065] Figure 5 is an internal formal structural schematic diagram of the drying room in the present invention.

[0066] Figure 6It is a schematic diagram of the rear structure of the present invention.

[0067] Figure 7 It is a schematic diagram of the structure in which only one drying chamber is provided in the drying room of the present invention.

[0068] Figure 8 It is Figure 7 The partial enlarged structure schematic diagram at position B in

[0069] Figure 9 It is the partial enlarged structure schematic diagram at position C in 7.

[0070] Figure 10 It is the partial enlarged structure schematic diagram at position D in 7.

[0071] Figure 11 It is a schematic diagram of the structure of components such as the material distribution transmission mechanism.

[0072] Figure 12 It is a schematic diagram of the structure of components such as the hatch door.

[0073] Figure 13 It is a schematic diagram of the structure of the discharge transmission mechanism.

[0074] Figure 14 It is a schematic diagram of the structure of the limit baffle component.

[0075] Figure 15 It is another three-dimensional structure schematic diagram of some components of the limit baffle component.

[0076] Figure 16 It is a schematic diagram of the structure of components such as the pusher mechanism.

[0077] Figure 17 It is a schematic diagram of the structure of the material limiting mechanism.

[0078] Figure 18 It is a three-dimensional structure schematic diagram of the pusher mechanism.

[0079] Figure 19 It is a schematic diagram of the structure in which the stacking component is used in cooperation with components such as the drying transmission mechanism.

[0080] Figure 20 It is a three-dimensional structure schematic diagram of the stacking component.

[0081] Figure 21 It is the partial enlarged structure schematic diagram at position E in 20.

[0082] Figure 22 It is the first three-dimensional structure schematic diagram of the drying tray.

[0083] Figure 23 It is the partial enlarged structure schematic diagram at position F in 22.

[0084] Figure 24 It is a second three-dimensional structural schematic diagram of the drying tray.

[0085] Figure 25 It is a structural schematic diagram of the material transfer and transmission component. Specific implementation manners

[0086] As Figures 1 to 25 shown, a drying device with hot air circulation includes a drying chamber 1,

[0087] a discharging and transmission mechanism 2, which is arranged outside the drying chamber 1, and the output end of the discharging and transmission mechanism 2 is used in cooperation with a material distribution and transmission mechanism 3 for conveying the drying tray 5 onto the material distribution and transmission mechanism 3;

[0088] a material distribution and transmission mechanism 3, which is located at the output end of the discharging and transmission mechanism 2 and extends into the drying chamber 1 through a channel opening 6 formed on the drying chamber 1 for conveying the drying tray 5 into the drying chamber 1;

[0089] a material limiting mechanism 7, which is located inside the drying chamber 1 and arranged on both sides of the material distribution and transmission mechanism 3 for limiting the drying tray 5 located on the material distribution and transmission mechanism 3;

[0090] a pushing mechanism 8, which is arranged outside the material distribution and transmission mechanism 3. After the material limiting mechanism 7 limits the drying tray 5, the pushing mechanism 8 pushes the drying tray 5 onto the material transfer and transmission component 9;

[0091] a material transfer and transmission component 9, which is located between the material distribution and transmission mechanism 3 and the drying chamber 10 for receiving the drying tray 5 conveyed by the pushing mechanism 8 and conveying it to the stacking component 11;

[0092] a stacking component 11, which is arranged outside the drying chamber 10 and located in the first half of the drying transmission mechanism 12 for stacking the drying trays 5;

[0093] The first half of the drying transmission mechanism 12 is located outside the drying chamber 10, and the second half of the drying transmission mechanism 12 extends into the drying chamber 10 through a drying opening 13 formed on the drying chamber 10 for conveying the stacked drying trays 5 into the drying chamber 10;

[0094] A hatch door 15 that can be opened and closed is arranged at the drying opening 13;

[0095] The drying chamber 10 is used for drying the materials placed in the drying tray 5. An outlet 16 is arranged at the rear end of the drying chamber 10, and a sealing door 17 is arranged at the outlet 16;

[0096] The limiting and baffle component 18 is provided on both the discharging transmission mechanism 2 and the drying transmission mechanism 12, and is used to limit the drying trays 5 on the discharging transmission mechanism 2 and the drying transmission mechanism 12.

[0097] The drying chamber 1 includes a drying area and a material conveying area. A top cover 200 is provided at the top of the material conveying area. The drying chamber 10 is located in the drying area. The material distribution transmission mechanism 3, the material limiting mechanism 7, the material pushing mechanism 8, and the material transfer transmission assembly 9 are all located in the material conveying area. The height of the material conveying area is higher than that of the drying area. There is an operation walkway 19 outside the material conveying area. Drying doors 20 are provided on both sides of the operation walkway 19 on the material conveying area. The channel opening 6 is opened on the left side of the material conveying area;

[0098] The discharging transmission mechanism 2 includes a discharging rack 21. A number of discharging driving wheels are provided on the discharging rack 21. Two symmetrically arranged discharging driving wheels are connected by a connecting shaft. The discharging driving wheels are driven by a discharging motor provided on the discharging rack 21. The discharging driving wheels on the same side are connected by respective discharging transmission belts 23. Each of the discharging transmission belts 23 is used to convey the drying tray 5. Discharging limiting strips 26 for limiting the drying tray 5 are provided on both upper sides of the discharging rack 21. Each of the discharging transmission belts 23 is located between the respective discharging limiting strips 26;

[0099] The limiting and baffle component 18 includes a positioning plate 27. The positioning plate 27 is connected to the discharging rack 21. A displacement seat 28 is slidably provided on the positioning plate 27. A driving cylinder 29 is provided on the positioning plate 27, and its output end is connected to the displacement seat 28 for driving the displacement seat 28 to slide along the length direction of the positioning plate 27. A guiding opening 30 is formed in the displacement seat 28, including an upper parallel section 30a, an inclined section 30b, and a lower parallel section 30c;

[0100] A rotating cylinder 31 is provided in the guiding opening 30. A limiting disk 32 is provided at one end of the rotating cylinder 31. The other end of the rotating cylinder 31 is rotatably connected to a limiting block 33. The cross-section of the limiting block 33 gradually becomes smaller from top to bottom. The limiting block 33 is slidably connected to a first guiding column 35. The first guiding column 35 is detachably connected to the positioning plate 27.

[0101] Notches 36 are provided on both sides of the drying tray 5. The limiting block 33 rises to be located at the notch 36 to limit the drying tray 5;

[0102] Two support handles 37 are provided at the upper end of the drying tray 5, and two limiting grooves 38 are formed at the lower end of the drying tray 5. When the drying trays 5 are stacked, the support handles 37 of the lower drying tray 5 cooperate with the limiting grooves 38 of the upper drying tray 5. The height of the support handle 37 is greater than the depth of the limiting groove 38, so that an air inlet channel 39 is formed between two adjacent drying trays 5;

[0103] A groove 50 is provided at the upper end of the drying tray 5, and a plurality of first through holes 51 are evenly distributed in the groove 50. A ventilation column 52 is provided at each of the first through holes 51. The cross section of the ventilation column 52 gradually increases from top to bottom. A second through hole 53 communicating with the first through hole 51 is formed at the upper end of the ventilation column 52, and a plurality of openings 55 communicating with the second through hole 53 are formed on the outer wall of the ventilation column 52. Each of the openings 55 is arranged in a circular array around the center line of the ventilation column 52.

[0104] The material distribution and transmission mechanism 3 includes a material distribution conveyor frame 56. A plurality of material distribution driving rollers are provided on the material distribution conveyor frame 56. Each of the material distribution driving rollers is connected by a material distribution transmission belt 57. A material distribution driving motor for driving the material distribution driving rollers to rotate is provided on the material distribution conveyor frame 56;

[0105] A side baffle 58 is provided on the front side of the material distribution conveyor frame 56, and a front baffle 59 is provided at the front end of the first half of the material distribution conveyor frame 56.

[0106] The material limiting mechanism 7 includes a support frame 60. The support frame 60 is detachably connected to the material distribution conveyor frame 56. A sliding rod 61 is slidably arranged on the support frame 60. A limiting rod 62 is arranged at the inner end of the sliding rod 61. A positioning disc 65 is arranged on the outer side of the sliding rod 61. A pulley 63 is arranged on the outer side of the positioning disc 65. A return spring 66 is arranged between the positioning disc 65 and the support frame 60;

[0107] An adjusting table 67 is slidably arranged on the support frame 60. The adjusting table 67 has an inclined surface 68 that cooperates with the pulley 63. The adjusting table 67 is driven by a limiting air cylinder 69 to adjust the position of the limiting rod 62.

[0108] The material pushing mechanism 8 includes a movable plate 70. Two frames 71 are arranged on the inner side of the movable plate 70. A push plate 72 extending out of the frame 71 is arranged in each of the frames 71. Two limiting ventilation openings 73 are formed on both sides of the drying tray 5. The limiting ventilation openings 73 are not only used for hot air circulation, but also cooperate with each of the push plates 72; Two guide rods 75 are arranged on the outer side of the movable plate 70. Each of the guide rods 75 is slidably inserted through each positioning ear 76. Each of the positioning ears 76 is detachably connected to the material distribution conveyor frame 56;

[0109] The material distribution conveyor frame 56 is provided with a propulsion cylinder 77 inside. The output end of the propulsion cylinder 77 extends out of the material distribution conveyor frame 56 and is connected to a connecting column 79 through a connecting piece 78. The connecting column 79 is located between two guide rods 75 and is connected to the outer side of the movable plate 70. The material transfer assembly 9 includes a base 80. A material transfer conveyor frame 81 is arranged on the base 80. A material transfer driving cylinder 82 is arranged on the material transfer conveyor frame 81. Each material transfer driving cylinder 82 is connected through a connecting shaft 83. The material transfer

[0110] driving cylinders 82 on the same side are connected through a material transfer belt 85. A material transfer motor 86 for driving the material transfer driving cylinder 82 to rotate is arranged on the material transfer conveyor frame 81. The stacking assembly 11 includes two symmetrically arranged first stacking frames 88 and second stacking frames 89. A plurality of pulleys are arranged at the lower ends of the first stacking frame 88 and the second stacking frame 89. The first stacking frame 88 is sleeved on a second guide post. The two ends of the second guide post are respectively connected to the drying conveyor mechanism 12 and the material distribution conveyor mechanism 3. The second stacking frame 89 is threadedly sleeved on a screw rod 90. One end of the screw rod 90 is rotatably connected to the drying conveyor mechanism 12. The other end of the screw rod 90 is connected to the output end of a displacement motor. The displacement motor is arranged in the installation box body 92. The installation box body 92 is located inside the material distribution conveyor frame 56;

[0111] The material transfer assembly 9 is located between the first stacking frame 88 and the second stacking frame 89. L-shaped guide members 91 are arranged on the inner sides between the first stacking frame 88 and the second stacking frame 89. The L-shaped guide members 91 are connected through a top plate 93. Two stacking cylinders 95 are simultaneously arranged at the lower end of the top plate 93. The output ends of the stacking cylinders 95 are respectively connected to a movable rod 97 through respective extension members 96. The movable rod 97 is respectively slidably connected to the L-shaped guide members 91;

[0112] Extension rods 98 are respectively arranged on both sides of the movable rod 97. A material grasping cylinder 99 is hinged to the inner side of each extension rod 98. The output end of the material grasping cylinder 99 is hinged to the rear half section of a swinging member 100. The middle section of the swinging member 100 is hinged to a positioning member 101. The upper end of the positioning member 101 is connected to the extension rod 98. An arc-shaped lifting rod 102 is arranged on the front half section of the swinging member 100. The arc-shaped lifting rod 102 is used for cooperating with the support handle 37;

[0113] The drying conveyor mechanism 12 includes a drying conveyor frame 103. A plurality of drying conveyor chain disks are arranged on the drying conveyor frame 103. The drying conveyor chain disks on the same side are respectively connected through respective drying conveyor chains;

[0114] The rear end of the hatch 15 is slidably connected to the drying chamber 10, the front end of the hatch 15 is connected to the output end of the lifting cylinder 105, the lifting cylinder 105 is arranged on the support plate 106, the support plate 106 is connected to the drying chamber 1, a blocking door 107 located in the drying transmission rack 103 is arranged below the hatch 15, and the blocking door 107 cooperates with the hatch 15 to close the drying chamber 10;

[0115] There are five drying chambers 10, and each drying chamber 10 is equipped with a material limiting mechanism 7, a material pushing mechanism 8, a material transferring and conveying assembly 9, a stacking assembly 11 and a drying conveying mechanism 12 that are used in cooperation with each other.

[0116] The drying chamber 10 is made of heat-insulating materials, and there is a hot air circulation system in the drying chamber 10: including an electric heating device, a fan and an air duct; in actual use, any device that can realize the drying function in the prior art can be used, and the present invention does not make specific limitations in this regard. Preferably, the drying unit installed in the drying chamber of the present invention includes:

[0117] Electric heating device: including electric heating tubes, heat-insulating mounting plates, temperature control components; Electric heating tubes: installed on the heat-insulating mounting plates; Heat-insulating mounting plates: The heat-insulating mounting plates are arranged in the drying chamber 10 for fixing the electric heating tubes; Temperature control components: composed of a temperature controller and a relay, installed in the control box on the side of the drying chamber 1. The temperature controller is responsible for real-time monitoring of the temperature of the electric heating tubes and feeding back the data to the relay, and the relay controls the on-off of the electric heating tubes according to the preset temperature value to achieve precise regulation of the temperature of the electric heating tubes; Fan: used to convey the air heated by the electric heating device to the drying chamber 10 through the air duct; Air duct: The air duct extends from the fan outlet to the top air outlet so that the hot air can be evenly distributed in the drying chamber 10. A return air outlet is arranged in the drying chamber 10. After the hot air passes through the medicinal materials, it carries the moisture in the medicinal materials and returns to the electric heating device from the return air outlet to realize the recycling of the hot air; improve energy utilization rate and drying uniformity; Temperature and humidity control unit: including a temperature sensor and a humidity sensor, which respectively monitor the temperature and humidity in the drying chamber 10 in real time. The sensors transmit the collected data to the controller, and the controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset drying parameters to achieve control of the temperature and humidity in the drying chamber 10. For different types of medicinal materials, corresponding drying parameters can be input through the controller, and the system will perform drying operations according to the set parameters.

[0118] A drying method for a drying device with hot air circulation, including:

[0119] Place the drying tray 5 with the medicinal materials to be dried on the discharging transmission mechanism 2. The discharging motor drives the discharging driving wheel to rotate, driving the discharging conveyor belt 23 to run, so as to convey the drying tray 5. When the drying tray 5 is conveyed to the first half of the material distributing transmission mechanism 3, it is limited by the side baffle 58 and the front baffle 59. This can not only prevent the drying tray 5 from falling off the material distributing transmission mechanism 3, but also adjust the position of the drying tray 5. At this time, the drying tray 5 located at the rear is limited by the limit baffle component 18. The specific limiting method is that the driving cylinder 29 is used to push the displacement seat 28 to slide. Through the sliding of the displacement seat 28, the rotating cylinder 31 located at the lower parallel section 30c moves towards the upper parallel section 30a. As the rotating cylinder 31 rises, its limiting block 33 rises to the notch 36 of the drying tray, so as to limit the subsequent drying tray 5, thus preventing multiple drying trays 5 from piling up in the first half of the material distributing transmission mechanism 3;

[0120] After the drying tray 5 is conveyed onto the material distributing transmission mechanism 3, the material distributing driving motor drives the material distributing driving roller to rotate, driving the material distributing conveyor belt 57 to convey the drying tray 5 into the drying room 1. When it reaches the corresponding drying chamber 10, at this time, the limiting mechanism 7 limits it at the same time, so as to prevent the drying tray 5 from being continuously driven forward by the material distributing transmission mechanism 3. The specific limiting method is that the limiting cylinder 69 is used to drive the adjusting table 67 to move. The inclined surface 68 of the adjusting table cooperates with the pulley 63, so that its sliding rod 61 drives the limiting rod 62 to move inwards to limit the drying tray on the material distributing transmission mechanism;

[0121] Subsequently, the drying tray 5 is pushed towards the stacking component 11 by the pushing mechanism 8. Specifically, the pushing cylinder 77 is used to pull the connecting piece 78, so that the connecting piece 78 drives the connecting column 79 to move. Through the movement of the connecting column 79, the movable plate 70 is driven to move. Through the movement of the movable plate 70, two push plates 72 are driven to move towards the drying tray 5. After the two push plates 72 are respectively inserted into the limiting ventilation openings 73, the drying tray 5 is pushed. The limiting ventilation openings 73 can not only cooperate with the drying tray 5 to make the pushing more stable, but also facilitate the circulation of hot air and improve the drying efficiency. The drying tray 5 is pushed onto the transfer transmission component 9. The transfer motor 86 drives the transfer driving cylinder 82 to rotate, driving the transfer conveyor belt 85 to run, and conveying the drying tray to the stacking component 11;

[0122] The displacement motor of the stacking component drives the screw 90 to rotate, thereby adjusting the position of the stacking component. Subsequently, the stacking cylinder 95 extends, drives the movable rod 97 to slide on the L-shaped guide 91 through the extension 96. Then, the material-gripping cylinder 99 extends, and the swinging member 100 rotates around the positioning member 101, drives the arc-shaped lifting rod 102 to move to lift the support handle 37 of the drying tray 5. Then, the stacking cylinder 95 drives the drying tray 5 to move upward. After the next drying tray 5 moves to the stacking component, the previous drying tray 5 is put down for stacking. Then, the stacking component grabs the drying tray 5 at the bottommost end to lift multiple drying trays 5. By repeating this operation, the stacking of several drying trays 5 is realized. The stacked drying trays 5 are conveyed by the drying conveyor chain plate and chain of the drying conveyor mechanism 12. The lifting cylinder 105 raises the hatch 15 to convey it into the drying chamber 10. When several groups of stacked drying trays 5 are all conveyed into the drying chamber 10, the shutter 107 cooperates with the hatch to close the drying chamber 10;

[0123] The drying chamber is made of heat-insulating materials and is internally provided with a hot air circulation system and a temperature and humidity control unit. The electric heating tubes of the electric heating device are on the heat-insulating mounting plate. The temperature control component monitors and regulates the temperature of the electric heating tubes in real time. The fan conveys the heated air to the drying chamber 10 through the air duct. The hot air is evenly distributed from the air outlet and returns to the electric heating device through the air return port for recycling. The temperature sensor and humidity sensor monitor the indoor temperature and humidity in real time. The controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset parameters to achieve drying. After drying is completed, the sealing door 17 is opened, and the drying conveyor mechanism sends out the dried tray from the discharge port 16 to complete the entire drying process.

[0124] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A drying device with hot air circulation, characterized in that, It includes a drying room (1), a discharging and conveying mechanism (2) which is arranged outside the drying room (1), and the output end of the discharging and conveying mechanism (2) is used in cooperation with a material distributing and conveying mechanism (3) to convey a drying tray (5) onto the material distributing and conveying mechanism (3); a material distributing and conveying mechanism (3) which is located at the output end of the discharging and conveying mechanism (2) and extends into the drying room (1) through a channel opening (6) formed in the drying room (1) to convey the drying tray (5) into the drying room (1); a material limiting mechanism (7) which is located inside the drying room (1) and arranged on both sides of the material distributing and conveying mechanism (3) to limit the drying tray (5) located on the material distributing and conveying mechanism (3); a pushing mechanism (8) which is arranged outside the material distributing and conveying mechanism (3). After the material limiting mechanism (7) limits the drying tray (5), the pushing mechanism (8) pushes the drying tray (5) onto a material transferring and conveying assembly (9); a material transferring and conveying assembly (9) which is located between the material distributing and conveying mechanism (3) and a drying chamber (10) to receive the drying tray (5) conveyed by the pushing mechanism (8) and convey it to a stacking assembly (11); a stacking assembly (11) which is arranged outside the drying chamber (10) and located in the first half of a drying and conveying mechanism (12) to stack the drying trays (5); The first half of the drying and conveying mechanism (12) is located outside the drying chamber (10), and the second half of the drying and conveying mechanism (12) extends into the drying chamber (10) through a drying opening (13) formed in the drying chamber (10) to convey the stacked drying trays (5) into the drying chamber (10); A hatch door (15) which can be opened and closed is arranged at the drying opening (13); The drying chamber (10) is used for drying the materials placed in the drying tray (5). A discharge opening (16) is arranged at the rear end of the drying chamber (10), and a sealing door (17) is arranged at the discharge opening (16); A limiting and baffle assembly (18) is arranged on both the discharging and conveying mechanism (2) and the drying and conveying mechanism (12) to limit the drying trays (5) on the discharging and conveying mechanism (2) and the drying and conveying mechanism (12).

2. The drying device with hot air circulation according to claim 1, characterized in that, The drying room (1) includes a drying area and a material conveying area. A top cover (200) is arranged at the top of the material conveying area. The drying chamber (10) is located in the drying area. The material distributing and conveying mechanism (3), the material limiting mechanism (7), the pushing mechanism (8), and the material transferring and conveying assembly (9) are all located in the material conveying area. The height of the material conveying area is higher than that of the drying area. An operation walkway (19) is arranged outside the material conveying area. Drying doors (20) are arranged on both sides of the operation walkway (19) and are arranged on the material conveying area. The channel opening (6) is formed on the left side of the material conveying area; The discharging and conveying mechanism (2) includes a discharging rack (21). A number of discharging driving wheels are arranged on the discharging rack (21). Two symmetrically arranged discharging driving wheels are connected by a connecting shaft. The discharging driving wheels are driven by a discharging motor arranged on the discharging rack (21). The discharging driving wheels on the same side are connected by respective discharging conveyor belts (23). Each of the discharging conveyor belts (23) is used for conveying the drying tray (5). Discharging limiting strips (26) for limiting the drying tray (5) are arranged on both sides of the upper end of the discharging rack (21). Each of the discharging conveyor belts (23) is respectively located between the respective discharging limiting strips (26). The limiting and blocking component (18) includes a positioning plate (27). The positioning plate (27) is connected to the discharging rack (21). A displacement seat (28) is slidably arranged on the positioning plate (27). A driving cylinder (29) is arranged on the positioning plate (27), and its output end is connected to the displacement seat (28) for driving the displacement seat (28) to slide along the length direction of the positioning plate (27). A guiding opening (30) is formed in the displacement seat (28), including an upper parallel section (30a), an inclined section (30b) and a lower parallel section (30c). A rotating cylinder (31) is arranged in the guiding opening (30). A limiting disc (32) is arranged at one end of the rotating cylinder (31). The other end of the rotating cylinder (31) is rotatably connected to a limiting block (33). The cross-section of the limiting block (33) gradually becomes smaller from top to bottom. The limiting block (33) is slidably connected to a first guiding column (35). The first guiding column (35) is detachably connected to the positioning plate (27).

3. The drying device with hot air circulation according to claim 2, characterized in that, Notches (36) are arranged on both sides of the drying tray (5). When the limiting block (33) rises to be located at the notch (36), it limits the drying tray (5). Two supporting handles (37) are arranged at the upper end of the drying tray (5). Two limiting grooves (38) are formed at the lower end of the drying tray (5). When the drying trays (5) are stacked, the supporting handle (37) of the lower drying tray (5) cooperates with the limiting groove (38) of the upper drying tray (5). The height of the supporting handle (37) is greater than the depth of the limiting groove (38), so that an air inlet channel (39) is formed between two adjacent drying trays (5). A groove (50) is arranged at the upper end of the drying tray (5). A number of first through holes (51) are evenly distributed in the groove (50). A ventilation column (52) is arranged at each of the first through holes (51). The cross-section of the ventilation column (52) gradually becomes larger from top to bottom. A second through hole (53) penetrating through the first through hole (51) is formed at the upper end of the ventilation column (52). A number of openings (55) penetrating through the second through hole (53) are formed on the outer wall of the ventilation column (52). Each of the openings (55) is arranged in a circular array around the central axis of the ventilation column (52).

4. The drying device with hot air circulation according to claim 3, characterized in that, The material distribution and transmission mechanism (3) includes a material distribution conveyor frame (56). A number of material distribution drive rollers are arranged on the material distribution conveyor frame (56), and each of the material distribution drive rollers is connected by a material distribution conveyor belt (57). A material distribution drive motor for driving the material distribution drive rollers to rotate is arranged on the material distribution conveyor frame (56). A side baffle (58) is arranged on the front side of the material distribution conveyor frame (56), and a front baffle (59) is arranged at the front end of the front half section of the material distribution conveyor frame (56).

5. The drying device with hot air circulation according to claim 4, characterized in that, The material limiting mechanism (7) includes a support frame (60). The support frame (60) is detachably connected to the material distribution conveyor frame (56). A sliding rod (61) is slidably arranged on the support frame (60). A limiting rod (62) is arranged at the inner end of the sliding rod (61). A positioning disc (65) is arranged on the outer side of the sliding rod (61). A pulley (63) is arranged on the outer side of the positioning disc (65). A return spring (66) is arranged between the positioning disc (65) and the support frame (60). An adjusting table (67) is slidably arranged on the support frame (60). The adjusting table (67) has an inclined surface (68) that cooperates with the pulley (63). The adjusting table (67) is driven by a limiting air cylinder (69) to adjust the position of the limiting rod (62).

6. The drying device with hot air circulation according to claim 5, characterized in that, The material pushing mechanism (8) includes a movable plate (70). Two frames (71) are arranged on the inner side of the movable plate (70). A push plate (72) extending out of the frame (71) is arranged in each of the frames (71). Two limiting ventilation openings (73) are formed on both sides of the drying tray (5). The limiting ventilation openings (73) are not only used for hot air circulation but also cooperate with each of the push plates (72). Two guide rods (75) are arranged on the outer side of the movable plate (70). Each of the guide rods (75) is slidably inserted through each positioning ear (76). Each of the positioning ears (76) is detachably connected to the material distribution conveyor frame (56). A propulsion cylinder (77) is arranged inside the material distribution conveyor frame (56). The output end of the propulsion cylinder (77) extends out of the material distribution conveyor frame (56) and is connected to a connecting column (79) through a connecting piece (78). The connecting column (79) is located between the two guide rods (75) and is connected to the outer side of the movable plate (70).

7. The drying device with hot air circulation according to claim 6, characterized in that, The material transfer and transmission assembly (9) includes a base (80). A material transfer conveyor frame (81) is arranged on the base (80). A material transfer drive cylinder (82) is arranged on the material transfer conveyor frame (81). Each of the material transfer drive cylinders (82) is connected by a connecting shaft (83). The material transfer drive cylinders (82) on the same side are connected by a material transfer conveyor belt (85). A material transfer motor (86) for driving the material transfer drive cylinders (82) to rotate is arranged on the material transfer conveyor frame (81).

8. The drying device with hot air circulation according to claim 7, characterized in that, The stacking assembly (11) includes two symmetrically arranged first stacking frames (88) and second stacking frames (89). A plurality of pulleys are provided at the lower ends of the first stacking frame (88) and the second stacking frame (89). The first stacking frame (88) is sleeved on the second guide post, and both ends of the second guide post are respectively connected to the drying transmission mechanism (12) and the material distribution transmission mechanism (3). The second stacking frame (89) is threadedly sleeved on the screw rod (90). One end of the screw rod (90) is rotatably connected to the drying transmission mechanism (12), and the other end of the screw rod (90) is connected to the output end of the displacement motor. The displacement motor is arranged in the installation box body (92), and the installation box body (92) is located in the material distribution conveying frame (56). The material transfer transmission assembly (9) is located between the first stacking frame (88) and the second stacking frame (89). L-shaped guides (91) are provided on the inner sides between the first stacking frame (88) and the second stacking frame (89). The L-shaped guides (91) are connected by a top plate (93). Two stacking cylinders (95) are simultaneously provided at the lower end of the top plate (93). The output ends of the stacking cylinders (95) are respectively connected to the movable rod (97) through the extension members (96). The movable rod (97) is slidably connected to the L-shaped guides (91). Extension rods (98) are respectively provided on both sides of the movable rod (97). Gripping cylinders (99) are hinged to the inner sides of the extension rods (98). The output end of the gripping cylinder (99) is hinged to the rear half section of the swing member (100). The middle section of the swing member (100) is hinged to the positioning member (101). The upper end of the positioning member (101) is connected to the extension rod (98). An arc-shaped lifting rod (102) is provided on the front half section of the swing member (100), and the arc-shaped lifting rod (102) is used in cooperation with the support handle (37). The drying transmission mechanism (12) includes a drying transmission frame (103). A plurality of drying transmission chain discs are provided on the drying transmission frame (103). The drying transmission chain discs on the same side are respectively connected by drying transmission chains. The rear end of the hatch door (15) is slidably connected to the drying chamber (10). The front end of the hatch door (15) is connected to the output end of the lifting cylinder (105). The lifting cylinder (105) is arranged on the support plate (106). The support plate (106) is connected to the drying room (1). A blocking door (107) located in the drying transmission frame (103) is provided below the hatch door (15). The blocking door (107) cooperates with the hatch door (15) to close the drying chamber (10). The number of drying chambers (10) is five. Each drying chamber (10) is equipped with a material limiting mechanism (7), a material pushing mechanism (8), a material transfer transmission assembly (9), a stacking assembly (11), and a drying transmission mechanism (12) that cooperate with each other.

9. The drying device with hot air circulation according to claim 8, characterized in that, The drying chamber (10) is made of heat-insulating materials, and inside the drying chamber (10) there is a hot air circulation system: including an electric heating device, a fan and an air duct; the electric heating device: including electric heating tubes, a heat-insulating mounting plate, and a temperature control component; the electric heating tubes: are installed on the heat-insulating mounting plate; the heat-insulating mounting plate: The heat-insulating mounting plate is arranged inside the drying chamber (10) and is used to fix the electric heating tubes; the temperature control component: consists of a thermostat and a relay, and is installed in the control box on the side of the drying room (1). The thermostat is responsible for monitoring the temperature of the electric heating tubes in real time and feeding the data back to the relay. The relay then controls the on-off of the electric heating tubes according to the preset temperature value to achieve precise regulation of the temperature of the electric heating tubes; the fan: is used to convey the air heated by the electric heating device to the drying chamber (10) through the air duct; the air duct: The air duct extends from the fan outlet to the top air outlet, so that the hot air can be evenly distributed in the drying chamber (10). An air return opening is arranged inside the drying chamber (10). After the hot air passes through the medicinal materials, it carries the moisture in the medicinal materials and returns to the electric heating device from the air return opening to realize the recycling of the hot air; improve energy utilization rate and drying uniformity; the temperature and humidity control unit: includes a temperature sensor and a humidity sensor, which respectively monitor the temperature and humidity inside the drying chamber (10) in real time. The sensors transmit the collected data to the controller, and the controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset drying parameters to realize the control of the temperature and humidity inside the drying chamber (10).

10. The drying method of the drying device with hot air circulation according to claim 9, characterized in that, including: Place the drying tray (5) with the medicinal materials to be dried on the discharge transmission mechanism (2). The discharge motor drives the discharge driving wheel to rotate, driving the discharge conveyor belt (23) to run, thereby conveying the drying tray (5). When the drying tray (5) is transported to the first half of the material distribution transmission mechanism (3), it is limited by the side baffle (58) and the front baffle (59), which can not only prevent the drying tray (5) from falling off the material distribution transmission mechanism (3), but also adjust the position of the drying tray (5). At this time, the drying tray (5) located at the rear is limited by the limit baffle component (18). The specific limiting method is to push the displacement seat (28) to slide through the driving cylinder (29). Through the sliding of the displacement seat (28), the rotating cylinder (31) located at the lower parallel section (30c) moves towards the upper parallel section (30a). As the rotating cylinder (31) rises, its limiting block (33) rises to the notch (36) of the drying tray, thereby limiting the subsequent drying trays (5), so as to prevent multiple drying trays (5) from stacking in the first half of the material distribution transmission mechanism (3); After the drying tray (5) is conveyed onto the material distributing and conveying mechanism (3), the material distributing driving motor drives the material distributing driving roller to rotate, driving the material distributing conveyor belt (57) to convey the drying tray (5) into the drying chamber (1). When it reaches the corresponding drying compartment (10), at this time, the limiting mechanism (7) limits it to prevent the drying tray (5) from being continuously driven forward by the material distributing and conveying mechanism (3). The specific limiting method is that the limiting air cylinder (69) drives the adjusting table (67) to move, and the inclined surface (68) of the adjusting table cooperates with the pulley (63), so that its sliding rod (61) drives the limiting rod (62) to move inward to limit the drying tray on the material distributing and conveying mechanism; Subsequently, the pushing mechanism (8) pushes the drying tray (5) towards the stacking assembly (11). Specifically, the pushing air cylinder (77) pulls the connecting member (78), enabling the connecting member (78) to drive the connecting column (79) to move. The movement of the connecting column (79) drives the movable plate (70) to move, and the movement of the movable plate (70) drives the two pushing plates (72) to move towards the drying tray (5). After the two pushing plates (72) are respectively inserted into the limiting ventilation openings (73), the drying tray (5) is pushed. The limiting ventilation openings (73) can not only cooperate with the drying tray (5) to make the pushing more stable, but also facilitate the circulation of hot air, improving the drying efficiency. The drying tray (5) is pushed onto the material transfer and conveying assembly (9). The material transfer motor (86) drives the material transfer driving cylinder (82) to rotate, driving the material transfer conveyor belt (85) to operate, and conveying the drying tray to the stacking assembly (11); The displacement motor of the stacking assembly drives the screw rod (90) to rotate, thereby adjusting the position of the stacking assembly. Subsequently, the stacking cylinder (95) extends, driving the movable rod (97) to slide on the L-shaped guiding member (91) through the extension member (96). Subsequently, the gripping cylinder (99) extends, and the swinging member (100) rotates around the positioning member (101), lifting the support handle (37) of the drying tray (5) by driving the arc-shaped lifting rod (102) to move. Then, the stacking cylinder (95) drives the drying tray (5) to move upward. After the next drying tray (5) moves to the stacking assembly, the previous drying tray (5) is put down for stacking. Then, the stacking assembly grabs the drying tray (5) at the lowermost end, thereby lifting multiple drying trays (5). By repeating this operation, the stacking of several drying trays (5) is achieved. The stacked drying trays (5) are conveyed by the drying conveyor chain disks and chains of the drying and conveying mechanism (12). The lifting cylinder (105) raises the hatch (15), thereby conveying it into the drying compartment (10). When several groups of stacked drying trays (5) are all conveyed into the drying compartment (10), the blocking door (107) cooperates with the hatch to close the drying compartment (10); The drying chamber is made of heat-insulating materials and is internally equipped with a hot air circulation system and a temperature and humidity control unit. The electric heating tubes of the electric heating device are on the heat-insulating mounting plate. The temperature control component monitors and adjusts the temperature of the electric heating tubes in real time. The fan conveys the heated air to the drying chamber (10) through the air duct. The hot air is evenly distributed from the air outlet and returns to the electric heating device through the air return port for recycling. The temperature sensor and humidity sensor monitor the indoor temperature and humidity in real time. The controller adjusts the power of the electric heating device and the rotation speed of the fan according to the preset parameters to achieve drying. After drying is completed, the sealing door (17) is opened, and the drying transmission mechanism sends the dried tray out from the discharge port (16) to complete the entire drying process.

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