Microwave drying method and microwave drying device based on water content of pills

Abstract

The present application provides a kind of microwave drying method and microwave drying device based on pill moisture content.The constant temperature drying air is introduced into drying chamber;The pill in drying chamber is heated by microwave;The water vapor discharged by pill is obtained, so that the temperature and humidity of drying chamber are obtained;The power of microwave is adjusted based on at least the temperature and humidity of drying chamber.As the constant temperature drying air is introduced into drying chamber, the constant temperature drying air absorbs the moisture in drying chamber, preventing the original moisture in drying chamber from affecting the accuracy of calculating the moisture content of pill later.Microwave can heat the pill, so that the moisture in the pill is gasified and discharged to the drying chamber, and then the temperature and humidity in the drying chamber gradually increase.The power of microwave and the temperature of microwave heating pill are positively correlated, by adjusting the power of microwave to change the heating temperature of pill during drying, and then the moisture content in the pill can be adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying device, in particular to a microwave drying method and microwave drying device based on water content of pills. BACKGROUND

[0002] Pills refer to spherical or spherical sheet-shaped preparations made of fine powder of medicinal materials or extract of medicinal materials and suitable adhesive excipients. According to the preparation method, pills are classified into molded pills such as honeyed pills, paste pills, concentrated pills and wax pills, and pan-fried pills such as water pills, water-honeyed pills, concentrated pills and paste pills, and drop pills. According to the excipient, pills are classified into water pills, honeyed pills, water-honeyed pills, paste pills and wax pills. In the process of pill production, an electric heating air drying oven is needed for drying work.

[0003] When the water content of the pills after drying is too high, the pills need to be further dried. When the water content of the pills after drying is too low, the pills are prone to dry cracking, which makes the pills easy to break. The existing pill drying equipment can only dry the pills in batches, and cannot control the water content of the pills. Therefore, the water content of the pills is difficult to control, and the required water content of the pills after drying is difficult to adjust, so that the quality of the pills is difficult to control. SUMMARY

[0004] In view of the above problems, the present application is proposed to provide a microwave drying method and microwave drying device based on water content of pills, which can overcome the above problems or at least partially solve the above problems, and can solve the problem that the existing drying equipment cannot control the water content of the pills, so as to control the water content of the pills.

[0005] Specifically, the present application provides a microwave drying method based on water content of pills, which comprises:

[0006] Constant temperature drying air is introduced into the drying chamber;

[0007] The pills in the drying chamber are heated and dried by microwaves;

[0008] The water vapor discharged by the pills is obtained, and the temperature and humidity of the drying chamber are obtained;

[0009] The power of the microwaves is adjusted based at least on the temperature and humidity of the drying chamber.

[0010] Optionally, adjusting the power of the microwaves based at least on the temperature and humidity of the drying chamber comprises:

[0011] When the temperature of the drying chamber is higher than a first preset temperature or the humidity of the drying chamber is higher than a first preset humidity, the frequency of the microwaves is adjusted to be lower; or

[0012] When the temperature of the drying chamber is lower than the first preset temperature or the humidity of the drying chamber is lower than the first preset humidity, the frequency of the microwaves is adjusted to be higher.

[0013] Optionally, the temperature and humidity of the drying chamber are also obtained by:

[0014] The amount of water in the water vapor is obtained according to the humidity of the drying chamber.

[0015] The water content of the pills is obtained according to the amount of water in the water vapor.

[0016] Optionally, the pills in the drying chamber are heated by microwaves, which includes:

[0017] The frequency of the microwaves is adjusted to a first frequency to preheat the drying chamber;

[0018] When the temperature of the drying chamber reaches the preheating temperature, the frequency of the microwaves is adjusted to a second frequency, and the second frequency is higher than the first frequency.

[0019] Optionally, the microwave drying method further includes:

[0020] The constant-temperature dry air is discharged to the outside of the drying chamber, and the drying chamber is reintroduced into the constant-temperature dry air.

[0021] Optionally, the microwave drying method further includes:

[0022] The heat of the drying chamber is introduced into the next batch of pills to be dried.

[0023] A microwave drying device for any of the above microwave drying methods, the microwave drying device includes a drying chamber, a conveying mechanism, a gas circulation mechanism, and a detection mechanism; the drying chamber is provided with a microwave drying device for drying the pills in the drying chamber; the conveying mechanism is used to convey the pills to be dried into the drying chamber; the gas circulation mechanism is used to introduce constant-temperature dry air into the drying chamber; the detection mechanism is used to obtain the humidity and temperature of the drying chamber, and to adjust the microwave drying device according to the humidity and temperature of the drying chamber.

[0024] Optionally, the conveying mechanism includes a plurality of placement slots; the plurality of placement slots are arranged in an array; each pill is located in a placement slot.

[0025] Optionally, the bottom of the placement slot is provided with a tray; the tray is placed in the placement slot; the microwave drying device further includes a lifting mechanism and a pressing mechanism; the lifting mechanism is arranged in the drying chamber and is used to lift the tray located in the placement slot in the drying chamber upward, thereby lifting the pills; the pressing mechanism is arranged in the drying chamber and is located above the placement slot, and is used to press the pills together with the placement slot after the drying of the pills is completed.

[0026] Optionally, the lifting mechanism comprises a plurality of lifting rods and a control part; the lifting rods are vertically arranged in the drying chamber and located at the lower end of the placing groove; each lifting rod is coaxially arranged with a placing groove, and the upper end of the lifting rod can penetrate into the placing groove and connect with the tray to move the tray upward when the lifting rod is elongated upward; the control part is used to elongate the lifting rods upward when the placing groove drives the pills into the drying chamber, and the length of the inner lifting rod is greater than that of the adjacent outer lifting rod.

[0027] Optionally, the pressing mechanism comprises a plurality of pressing rods and a support part; the support part is arranged above the placing groove; the pressing rods are vertically arranged and arrayed on the support part and located above the placing groove; each pressing rod is coaxially arranged with a lifting rod; the lower end of the pressing rod is provided with a pressing groove, which can extrude the pills when the pressing groove abuts against the placing groove; the support part is used to drive the pressing rods to move downward after the heating of the pills is completed.

[0028] In the microwave drying method based on the water content of the pills, the constant-temperature drying air is introduced into the drying chamber, so that the constant-temperature drying air absorbs the moisture in the drying chamber, preventing the original moisture in the drying chamber from affecting the accuracy of the calculation of the water content of the pills in the later stage. The microwave can heat the pills, so that the moisture in the pills is gasified and discharged to the drying chamber, and then the temperature and humidity in the drying chamber gradually increase. The power of the microwave and the temperature of the microwave heating the pills are positively correlated, and by adjusting the power of the microwave, the heating temperature of the pills during drying can be changed, and then the water content in the pills can be adjusted.

[0029] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of some embodiments thereof, when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] Some specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are exemplary and not limiting. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0031] Figure 1 is a schematic flowchart of a microwave drying method based on the water content of the pills according to an embodiment of the present application;

[0032] Figure 2 is a schematic flowchart of a microwave drying method based on the water content of the pills according to an embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of a microwave drying device according to an embodiment of the present application;

[0034] Figure 4 This is a schematic internal structural diagram of a microwave drying apparatus according to an embodiment of the present invention. Detailed Implementation

[0035] The following reference Figures 1 to 4 This invention describes a microwave drying method and apparatus for pills based on their moisture content, according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0036] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of the present embodiments, the description of the terms "one embodiment", "some embodiments”, "exemplary embodiment”, "example”, "specific example” or "some examples” means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The exemplary expressions of the above terms in the present specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0039] Figure 1 is a schematic flowchart of the microwave drying method based on the water content of the pills, as shown in Figure 1 and with reference to Figures 2 to 4 The present embodiments provide a microwave drying method based on the water content of the pills, which comprises:

[0040] S100: introducing constant temperature drying air into the drying chamber 100;

[0041] S200: heating the pills in the drying chamber 100 by using microwaves;

[0042] S300: obtaining the water vapor discharged by the pills, thereby obtaining the temperature and humidity of the drying chamber 100;

[0043] S400: adjusting the power of the microwaves based at least on the temperature and humidity of the drying chamber 100.

[0044] Specifically, the constant temperature drying air is introduced into the drying chamber 100, so that the constant temperature drying air absorbs and removes the moisture in the drying chamber 100, preventing the original moisture in the drying chamber 100 from affecting the accuracy of the calculation of the water content of the pills in the later stage. Further, the drying chamber 100 is a sealed space.

[0045] Further, the microwaves can heat the pills, so that the moisture in the pills is gasified and discharged to the drying chamber 100, thereby gradually increasing the temperature and humidity in the drying chamber 100.

[0046] Further, the power of the microwaves and the heating temperature of the microwaves to the pills are positively correlated, and by adjusting the power of the microwaves, the heating temperature of the pills during drying can be changed, thereby the water content inside the pills can be adjusted.

[0047] In some embodiments of the present application, as shown in Figure 1 and Figure 2 The microwave drying method based on the water content of the pills further comprises:

[0048] The cooling air is introduced into the drying chamber 100 after the drying is completed, and the temperature of the cooling air is gradually reduced from the temperature in the drying chamber 100 to 2-5 degrees Celsius.

[0049] Specifically, during the drying process, the water in the pills evaporates and diffuses outward, which causes the pills to have pores and thus increases the volume of the pills. According to the thermal expansion principle, the high temperature in the drying chamber 100 further increases the volume of the pills. The increased volume and the internal pores of the pills make the pills fragile, which is not conducive to subsequent packaging and reduces the quality of the pills. Therefore, according to the principle of thermal contraction, the cooling gas is introduced into the drying chamber 100 to precool and shrink the pills, thereby reducing the volume of the pills and improving the quality of the pills.

[0050] In some embodiments of the present application, as shown in Figure 1 and Figure 2 The power of the microwave is adjusted based at least on the temperature and humidity in the drying chamber 100, including:

[0051] S410: When the temperature in the drying chamber 100 is higher than a first preset temperature or the humidity in the drying chamber 100 is higher than a first preset humidity, the frequency of the microwave is adjusted to be lower; or,

[0052] When the temperature in the drying chamber 100 is lower than the first preset temperature or the humidity in the drying chamber 100 is lower than the first preset humidity, the frequency of the microwave is adjusted to be higher.

[0053] Specifically, the first preset temperature is a safe temperature value during the drying process of the pills. When the temperature in the drying chamber 100 is higher than or lower than the preset temperature, the pills are likely to lose their medicinal properties or be over-dried.

[0054] Further, the humidity in the drying chamber 100 can reflect the amount of water discharged by the pills, and the first preset humidity is a safe value reflecting the water content of the pills. When the humidity in the drying chamber 100 is higher than the first preset humidity, the pills are likely to be over-dried with too low water content.

[0055] In this embodiment, when the temperature in the drying chamber 100 is higher than the first preset temperature or the humidity in the drying chamber 100 is higher than the first preset humidity, the microwave can also be directly turned off, and the residual heat in the drying chamber 100 is used to further dry the pills.

[0056] In some embodiments of the present application, as shown in Figure 1 Therefore, obtaining the temperature and humidity in the drying chamber 100 further includes:

[0057] S310: The amount of water in the water vapor is obtained according to the humidity in the drying chamber 100;

[0058] S320: The water content of the pills is obtained according to the amount of water in the water vapor.

[0059] Specifically, the water amount in the water vapor is from the water amount in the pills. Further, since the volume of the drying chamber 100 is constant, the water amount in the water vapor = the volume of the drying chamber 100 * the humidity of the drying chamber 100.

[0060] Further, the total water amount of the pills = the initial water content of the pills * the mass of the initial pills. The initial water content of the pills can be calculated according to the pharmaceutical formula and is usually a fixed value.

[0061] Further, the total water amount of the pills - the water amount in the water vapor = the total water amount of the dried pills. According to the total water amount of the dried pills, the water content of the dried pills can be calculated, and the above calculation formula can be calculated by a preset program.

[0062] Further, the total water amount of the dried pills is used to determine whether the pills reach the required water content.

[0063] If yes, the microwave frequency is turned off or lowered; if no, the microwave drying time is increased or prolonged.

[0064] In some embodiments of the present application, as shown in Figure 1 and Figure 2 the microwave heating of the pills in the drying chamber 100 includes:

[0065] S210: The frequency of the microwave is adjusted to a first frequency to preheat the drying chamber 100.

[0066] S220: When the temperature of the drying chamber 100 reaches the preheating temperature, the frequency of the microwave is adjusted to a second frequency, and the second frequency is higher than the first frequency.

[0067] Specifically, the first frequency of the microwave can slowly increase the temperature of the drying chamber 100 and slowly heat the pills, thereby preventing the pills from cracking due to sudden temperature increase, and thus affecting the quality of the pills.

[0068] The second frequency of the microwave can increase the temperature of the drying chamber 100 to the required temperature for drying the pills. The process of increasing the microwave from the first frequency to the second frequency is a slow adjustment to prevent the temperature of the drying chamber 100 from increasing sharply.

[0069] In some embodiments of the present application, as shown in Figure 1 the microwave drying method further includes:

[0070] S500: The constant-temperature drying air is discharged out of the drying chamber 100, and the drying chamber 100 is introduced into the constant-temperature drying air again.

[0071] Specifically, the drying air can carry the water vapor in the drying chamber 100 out of the drying chamber 100, thereby preventing the water vapor in the drying chamber 100 from re-entering the pills and thus affecting the drying effect of the pills.

[0072] Further, the circulation of the dry air forms an air flow in the drying chamber 100, which can further dry the surface of the pills, thereby increasing the drying effect of the pills.

[0073] In some embodiments of the present application, the microwave drying method further comprises:

[0074] S600: introducing the heat in the drying chamber 100 to the next batch of pills to be dried.

[0075] Specifically, the step of introducing the heat in the drying chamber 100 to the next batch of pills to be dried can preheat the pills to be dried, and improve the utilization efficiency of the heat, thereby achieving the effect of energy saving.

[0076] A microwave drying device for the microwave drying method of any one of the above embodiments, as shown in Figure 3 and Figure 4 The microwave drying device comprises a drying chamber 100, a conveying mechanism 200, a gas circulation mechanism 300, and a detection mechanism.

[0077] The drying chamber 100 is provided with a microwave drying device 130 for drying the pills in the drying chamber 100. The conveying mechanism 200 is used to convey the pills to be dried into the drying chamber 100. The gas circulation mechanism 300 is used to introduce constant-temperature dry air into the drying chamber 100. The detection mechanism is used to obtain the humidity and temperature of the drying chamber 100, and adjust the microwave drying device 130 according to the humidity and temperature of the drying chamber 100.

[0078] In operation, the conveying mechanism 200 drives the pills to be dried to be conveyed forward into the drying chamber 100, and the microwave drying device 130 is started to continuously generate microwaves to heat the pills. During the heating of the pills, the water in the pills is discharged outward under the action of high temperature, thereby completing the drying of the pills.

[0079] When the water in the pills is discharged outward into the drying chamber 100, the detection mechanism checks the humidity and temperature of the drying chamber 100. When the temperature of the drying chamber 100 is higher than a first preset temperature or the humidity of the drying chamber 100 is higher than a first preset humidity, the frequency of the microwaves of the microwave drying device 130 is adjusted to be lower.

[0080] When the temperature of the drying chamber 100 is lower than the first preset temperature or the humidity of the drying chamber 100 is lower than the first preset humidity, the frequency of the microwave drying device 130 is adjusted to be higher.

[0081] Specifically, the gas circulation mechanism 300 is capable of introducing constant temperature dry air into the drying chamber 100, so that the drying chamber 100 is kept dry before use, and the moisture in the drying chamber 100 can be discharged. The gas circulation mechanism 300 can also introduce the dried moisture into the drying chamber 100. Further, a sealing structure is arranged between the drying chamber 100 and the conveying mechanism 200, so that the drying chamber 100 is a sealed space.

[0082] In the embodiment, the gas circulation mechanism 300 includes a circulation pipeline 310, an air drying device 320, and a fan blade 330. One end of the circulation pipeline 310 is in communication with the front side of the drying chamber 100, and the other end is in communication with the rear side of the drying chamber 100. The fan blade 330 is rotatably arranged in the circulation pipeline 310, so that when the fan blade 330 rotates, the constant temperature dry air is introduced into the drying chamber 100, and the moisture in the drying chamber 100 is discharged from the drying chamber 100. The air drying device 320 is arranged in the circulation pipeline 310, and can absorb the water in the moisture when the moisture passes through, so as to convert the moisture into constant temperature dry air, thereby forming an air circulation system.

[0083] In the embodiment, the constant temperature dry gas enters the drying chamber 100 from one end of the circulation pipeline 310, and the moisture is discharged from the other end of the circulation pipeline 310. The detection mechanism is arranged at the other end of the circulation pipeline 310, so that the detection mechanism can detect the humidity and temperature of the moisture.

[0084] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The conveying mechanism 200 includes a plurality of placement grooves 210, and the plurality of placement grooves 210 are arranged in an array, and each pill is located in one placement groove 210.

[0085] Specifically, the placement groove 210 is semispherical, and the diameter of the placement groove 210 is slightly larger than the diameter of the pill, so as to reduce the movement space of the pill in the placement groove 210, and make the pill conveying process more stable.

[0086] In the embodiment, the conveying mechanism 200 further includes a conveying belt 220 and a conveying frame. The conveying belt 220 is rotatably arranged on the conveying frame, the placement groove 210 is arranged on the conveying belt 220, and the conveying belt 220 drives the placement groove 210 to convey forward.

[0087] In the embodiment, the conveying belt 220 is intermittently conveyed forward, so that the pill can pause for a preset time during the forward conveying process. The pause of the pill for the preset time is the drying time of the pill in the drying chamber 100.

[0088] In some embodiments of the present application, as shown in Figure 3 and Figure 4As shown, the bottom of the placing groove 210 is provided with a tray 230, and the tray 230 is placed in the placing groove 210. The drying chamber 100 is provided with a lifting mechanism 110, which is used to drive the tray 230 in the placing groove 210 of the drying chamber 100 to lift upward, thereby driving the pills to lift. The drying chamber 100 is provided with a pressing mechanism above the placing groove 210, which is used to press the pills together with the placing groove 210 after the pills are dried.

[0089] Specifically, the lifting mechanism 110 drives the pills to lift upward through the tray 230, which can make the microwave heat the pills sufficiently, thereby improving the drying efficiency of the pills.

[0090] Further, the bottom of the placing groove 210 is provided with a circular hole, which is vertically penetrated, and the peripheral wall is provided with a boss. The tray 230 can be embeddedly installed in the circular hole.

[0091] Specifically, the setting of the pressing mechanism can prevent the pills from expanding too much after preheating, thereby further pressing and shaping the dried pills, and can increase the roundness of the pills to ensure the quality of the dried pills.

[0092] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The lifting mechanism 110 includes a plurality of lifting rods and a control part. The lifting rods are vertically arranged in the drying chamber 100 in an extendable manner, and are located at the lower end of the placing groove 210. Each lifting rod is coaxially arranged with a placing groove 210, and the upper end of the lifting rod can penetrate the placing groove 210 and connect with the tray 230 to move the tray 230 upward when the lifting rod is elongated upward. The control part is used to elongate the lifting rod upward when the pills are brought into the drying chamber 100 by the placing groove 210, and the length of the inner lifting rod is greater than the length of the adjacent outer lifting rod.

[0093] Specifically, the lifting rod is a hydraulic telescopic rod, and the control part controls the extension and retraction of the lifting rod by hydraulic pressure. Each lifting rod corresponds to the tray 230 of a placing groove 210.

[0094] Further, the tray 230 and the upper end of the lifting rod are both provided with a magnet, so that the lifting rod and the tray 230 can be attracted to each other when the lifting rod is elongated upward, thereby increasing the stability of the process of lifting the pills.

[0095] Specifically, the length of the inner lifting rod is greater than the length of the adjacent outer lifting rod, so that the position of the pills on the inner side of the lifting rod after elongation is higher than the height of the pills on the outer side, preventing the microwave from being blocked by the pills on the outer side during inward propagation, so that the microwave can heat each pill comprehensively.

[0096] In the embodiment, the lifting mechanism 110 further comprises a rotating motor connected with the lifting rod, which is used to rotate the lifting rod when the lifting rod is elongated to the preset length, so as to rotate the pills in the drying chamber 100, which can further increase the drying effect of the pills.

[0097] In the embodiment, the placing groove 210 is made of memory alloy, which is configured to restore to the initial diameter after the temperature reaches the preset temperature, so as to compress and extrude the expanded pills to ensure the roundness of the pills.

[0098] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The pressing mechanism comprises a plurality of pressing rods and a support part. The support part is arranged above the placing groove 210, and the pressing rods are vertically arranged and arrayed on the support part above the placing groove 210. Each pressing rod is coaxially arranged with a lifting rod. The lower end of the pressing rod is provided with a pressing groove 120, which can extrude the pills when the pressing groove 120 abuts against the placing groove 210; and the support part is used to move the pressing rod downward after the heating of the pills is completed.

[0099] Specifically, the pressing rod is a hydraulic telescopic rod, which is configured to be elongated after the drying of the pills is completed. Further, the pressing groove 120 is a semispherical groove, and the diameter of the pressing groove 120 is the same as that of the placing groove 210. The pressing groove 120 and the placing groove 210 form a spherical structure when they abut against each other, so that the pills can be shaped when they are extruded.

[0100] At this point, those skilled in the art should recognize that, although the present application has been shown and described in detail in the above embodiments, many other variations or modifications can be directly determined or deduced according to the disclosure of the present application without departing from the spirit and scope of the present application, which conform to the principles of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variations or modifications.

Claims

1. A microwave drying apparatus, characterized by: It comprises: a drying chamber, which is provided with a microwave drying device for drying pills in the drying chamber; a conveying mechanism for conveying pills into the drying chamber; a gas circulation mechanism for introducing constant-temperature dry air into the drying chamber; a detection mechanism for obtaining the humidity and temperature of the drying chamber and adjusting the microwave drying device according to the humidity and temperature of the drying chamber; the conveying mechanism comprises a plurality of placement grooves; the plurality of placement grooves are arranged in an array; each of the pills is located in one of the placement grooves; the bottom of each of the placement grooves is provided with a tray; and the tray is placed in the placement groove; the microwave drying device further comprises a lifting mechanism; the lifting mechanism is arranged in the drying chamber and is used to lift the tray located in the placement groove in the drying chamber upward, thereby lifting the pills; the lifting mechanism comprises a plurality of lifting rods and a control part; the lifting rods are vertically arranged in the drying chamber and are located at the lower end of the placement groove; each of the lifting rods is coaxially arranged with one of the placement grooves, and the upper end of the lifting rod can penetrate the placement groove and connect with the tray upward, so that the tray moves upward when the lifting rod is elongated upward; and the control part is used to elongate the lifting rod upward when the placement groove drives the pills into the drying chamber, and the length of the lifting rod located at the inner side is greater than the length of the lifting rod located at the outer side.

2. The microwave drying device according to claim 1, wherein the microwave drying device further comprises a pressing mechanism; the pressing mechanism is arranged in the drying chamber and is located above the placement groove, and is used to press the pills together with the placement groove after the pills are dried.

3. The microwave drying device according to claim 2, wherein the pressing mechanism comprises a plurality of pressing rods and a support part; the support part is arranged above the placement groove; the pressing rods are vertically arranged and are arranged in an array on the support part and above the placement groove; each of the pressing rods is coaxially arranged with one of the lifting rods; the lower end of the pressing rod is provided with a pressing groove, which can press the pills when the pressing groove abuts against the placement groove; and the support part is used to move the pressing rod downward after the pills are heated.

4. A microwave drying method using the microwave drying apparatus according to any one of claims 1 to 3, characterized by, It comprises: introducing constant-temperature dry air into the drying chamber; heating the pills in the drying chamber by using microwaves; making the position of the pills located at the inner side higher than the height of the pills located at the outer side after the lifting rods are elongated, so as to prevent the microwaves from being blocked by the pills located at the outer side during the inward propagation of the microwaves, thereby enabling the microwaves to heat each of the pills comprehensively; obtaining the water vapor discharged by the pills, thereby obtaining the temperature and humidity of the drying chamber; adjusting the power of the microwaves based at least on the temperature and humidity of the drying chamber.

5. The microwave drying method according to claim 4, wherein The power of the microwave is adjusted based on at least the temperature and humidity of the drying chamber, including: when the temperature of the drying chamber is higher than a first preset temperature or the humidity of the drying chamber is higher than a first preset humidity, the frequency of the microwave is adjusted to be lower; or, when the temperature of the drying chamber is lower than the first preset temperature or the humidity of the drying chamber is lower than the first preset humidity, the frequency of the microwave is adjusted to be higher.

6. The microwave drying method of claim 4, wherein the temperature and humidity of the drying chamber are obtained by: the humidity of the drying chamber is obtained by the amount of water in the water vapor; and the water content of the pellets is obtained by the amount of water in the water vapor.

7. The microwave drying method of claim 4, wherein the pellets in the drying chamber are heated by the microwave, including: preheating the drying chamber by adjusting the frequency of the microwave to a first frequency; and when the temperature of the drying chamber reaches a preheating temperature, adjusting the frequency of the microwave to a second frequency, and the second frequency is higher than the first frequency. Further including: the water vapor in the drying chamber is discharged from the drying chamber, and the water vapor is dried by the gas circulation mechanism and then introduced into the drying chamber again.

8. The microwave drying method of claim 4, wherein, ​ ​

Images