Low-temperature slow-drying traditional Chinese medicine drying box

Abstract

This utility model belongs to the field of traditional Chinese medicine drying technology, and in particular to a low-temperature slow-drying drying box for traditional Chinese medicine. The drying box is internally equipped with a drying chamber, a hot air duct, and a return air duct. One side of the drying chamber is open and equipped with a sealed door. Multiple sets of horizontal supports are vertically arranged inside the drying chamber. Multiple hot air inlets and return air inlets are opened on one side of the hot air duct and the return air duct. The hot air inlets and return air inlets are arranged between the horizontal supports. The hot air inlets are connected to the hot air duct, and the return air inlets are connected to the return air duct. A switch is provided at the return air inlet to allow for same-layer or staggered-layer return air. This application can select laminar flow mode or axial flow mode hot air circulation according to different materials, making it more applicable.

Description

Technical Field

[0001] This utility model relates to the field of Chinese medicinal material drying technology, and in particular to a low-temperature slow-drying box for Chinese medicinal materials. Background Technology

[0002] Low-temperature slow-drying ovens are devices that use lower temperatures and longer drying times to gently dry materials. They are widely used in food, agricultural products, and medicinal materials. They can effectively preserve the effective components, color, and shape of materials. The slow drying process ensures that the rate of moisture diffusion inside and outside the material is consistent, preventing surface film formation and internal moisture retention, and reducing problems such as material cracking and deformation. Although the drying time is long, the overall energy consumption is relatively low due to the low operating temperature, which meets the requirements of energy conservation and environmental protection.

[0003] However, existing drying ovens generally only have a laminar flow mode or an axial flow mode for hot air circulation, which is relatively simple. Utility Model Content

[0004] This invention provides a low-temperature slow-drying Chinese medicinal materials drying box, which solves the shortcomings of existing technologies that only set up laminar flow mode or axial flow mode for hot air circulation, resulting in a relatively simple hot air circulation mode.

[0005] This utility model provides the following technical solution:

[0006] A low-temperature slow-drying oven for Chinese medicinal herbs

[0007] Drying oven; internally equipped with a drying chamber, hot air duct, and return air duct;

[0008] The drying chamber is open on one side and is equipped with a sealed door. The drying chamber is equipped with multiple sets of horizontal brackets in the vertical direction. The drying chamber has multiple hot air inlets and return air inlets on one side of the hot air duct and return air duct. The hot air inlets and return air inlets are located between the horizontal brackets. The hot air inlets are connected to the hot air duct, and the return air inlets are connected to the return air duct.

[0009] A switch is installed at the return air vent to allow for same-floor or staggered-floor return air.

[0010] Preferably, the return air duct is vertically arranged, and a height-adjustable adjustment plate is slidably installed on one side of the return air inlet. The adjustment plate is provided with multiple through-holes, including at least one set of through-holes corresponding one-to-one with the return air inlet and at least one set of through-holes that are staggered and connected to the return air inlet.

[0011] Preferably, the top of the adjusting plate is provided with a positioning member, which extends out of the drying box and is connected to the positioning rod. The positioning member has multiple insertion holes, and the spacing between the insertion holes matches the spacing between different sets of through holes.

[0012] Preferably, a first partition is installed on one side of the drying oven, the first partition is arranged parallel to the side plate, a second partition is installed between the first partition and the side plate, the second partition is perpendicular to the first partition and the side plate respectively, the first partition and the oven body form a hot air circulation cavity, and the second partition divides the hot air circulation cavity into a vertically arranged hot air duct and a return air duct.

[0013] Preferably, a circulating fan is provided between the hot air duct and the return air duct, and an electric heating device is provided at the end of the hot air duct near the circulating fan.

[0014] Preferably, the top of the return air duct is connected to the air inlet of the circulating fan via a pipe, and the top of the hot air duct is connected to the air outlet of the circulating fan via a pipe.

[0015] Preferably, the top of the drying chamber is provided with an exhaust vent and an exhaust fan.

[0016] Preferably, the drying oven is equipped with a humidity sensor and a temperature sensor, and a control box is installed on one side of the drying oven. The humidity sensor, temperature sensor, electric heating device, and circulating fan are all connected to the controller in the control box.

[0017] Preferably, the body of the drying oven, as well as the first partition and the second partition, are all made of heat-insulating materials.

[0018] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0019] In this invention, when the material to be dried is a relatively thick Chinese medicinal herb, such as tuberous roots or stems, the return air vents can be manually adjusted to close the return air vents on the same layer as the hot air vents and open the return air vents on different layers. For example, from bottom to top, there are first, second, third, and so on, up to the top layer. The hot air vents of all layers are open, while the return air vents are opened at intervals, such as second, fourth, and sixth layers, or third, sixth, and ninth layers, etc., thus forming a staggered hot air flow path and strengthening the axial (vertical) flow of hot air in the drying chamber. When the material to be dried is a flower, leaf, or some thin root or stem material, all return air vents can be opened. For example, both the hot air vents and return air vents in the first layer are opened, thus forming a horizontal hot air flow in the first layer. Other layers also form a laminar flow hot air circulation pattern like the first layer.

[0020] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 One of the three-dimensional structural schematic diagrams of a low-temperature slow-drying Chinese herbal medicine drying box provided in this utility model embodiment;

[0023] Figure 2 This is the second three-dimensional structural schematic diagram of a low-temperature slow-drying Chinese herbal medicine drying box provided in this embodiment of the utility model;

[0024] Figure 3 A schematic diagram of the hot air duct and return air duct of a low-temperature slow-drying Chinese herbal medicine drying box provided in this embodiment of the utility model;

[0025] Figure 4 A schematic diagram of the drying chamber and hot air duct structure of a low-temperature slow-drying Chinese herbal medicine drying box provided for an embodiment of this utility model;

[0026] Figure 5 A schematic diagram of the finned heating tube structure inside the hot air duct of a low-temperature slow-drying Chinese herbal medicine drying box provided in this embodiment of the utility model;

[0027] Figure 6 A schematic diagram of the adjusting plate structure of a low-temperature slow-drying Chinese herbal medicine drying box provided in an embodiment of this utility model;

[0028] Figure 7 This is an enlarged schematic diagram of the adjustment plate A of a low-temperature slow-drying Chinese herbal medicine drying box provided in an embodiment of this utility model.

[0029] Figure label:

[0030] 1. Drying oven; 2. Exhaust vent; 3. Drying chamber; 4. Sealed door; 5. Shell; 6. High-temperature resistant blower motor; 7. Horizontal bracket; 8. Return air vent; 9. Hot air vent; 10. Control box; 11. Hot air duct; 12. Second partition; 13. Adjusting plate; 14. L-shaped limiter; 15. Electric heating device; 16. Finned heating tube; 17. Through port; 18. Positioning component; 19. Insert rod; 20. Insertion hole; 21. Return air duct. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] To better understand the purpose, function, and specific design scheme of this utility model, the fully automatic opening and pressing machine of this utility model will be described in further detail below with reference to the accompanying drawings.

[0037] Reference Figures 1-7 ,like Figure 1 As shown, a low-temperature slow-drying Chinese medicinal herb drying box 1 is provided. The drying box 1 has a drying chamber 3, a hot air duct 11, and a return air duct 21 inside. The drying chamber 3 is used to dry the materials, the hot air duct 11 is used to supply hot air, and the return air duct 21 is used to recover air from the drying chamber 3. One side of the drying chamber 3 is open and equipped with a sealing door 4. When the sealing door 4 is closed, the drying chamber 3 forms a sealed drying space. Multiple sets of horizontal supports 7 are vertically arranged inside the drying chamber 3 for placing drying trays. The drying chamber 3 is connected to the hot air duct 11 and the return air duct 21... Multiple hot air inlets 9 and return air inlets 8 are provided on the side, and the hot air inlets 9 and return air inlets 8 are arranged between the horizontal brackets 7. The hot air inlets 9 are connected to the hot air duct 11, and the return air inlets 8 are connected to the return air duct 21. The hot air inlets 9 can introduce hot air in the hot air duct 11 into the drying chamber 3, and the return air inlets 8 can introduce the dried air in the drying chamber 3 into the return air duct 21. A switch is provided at the return air inlet 8 to control the opening and closing of the return air inlet 8 to perform same-floor return air or staggered-floor return air.

[0038] In the above embodiments, drying trays are placed on the horizontal brackets 7. When the material to be dried is a relatively thick Chinese medicinal herb, such as root, stem, or woody medicinal slices, the return air vents 8 can be manually adjusted so that the return air vents 8 on the same layer as the hot air vents 9 are closed, while the return air vents 8 on different layers are open. For example, from bottom to top, there are first, second, third, ... up to the top layer, where the hot air vents 9 on all layers are open, while the return air vents 8 are opened at intervals, such as second, fourth, and sixth layers, or third, sixth, and ninth layers, etc., thus forming a staggered hot air flow path, thereby strengthening the axial (vertical) flow of hot air in the drying chamber 3. When the material to be dried is a flower, leaf, or some thin root or stem material, all return air vents 8 can be opened. For example, in the first layer, both the hot air vents 9 and the return air vents 8 are open, thus forming a horizontal hot air flow in the first layer. Other layers also form a laminar flow hot air circulation like the first layer.

[0039] like Figure 1 As shown, in some specific embodiments, the sealing door 4 is provided with an observation window, and the observation window is fitted with heat-insulating glass (not marked in the figure).

[0040] like Figure 2As shown, in some specific embodiments, the control box 10 is fixedly connected to the drying box 1 via a mounting bracket (not shown in the figure).

[0041] like Figure 2 , Figure 6 , Figure 7 As shown, the return air duct 21 is vertically arranged, and a height-adjustable adjustment plate 13 is slidably installed on one side of the return air inlet 8. The adjustment plate 13 is provided with a plurality of through holes 17, and at least one set of through holes 17 corresponding one-to-one with the return air inlet 8 and at least one set of through holes 17 that are staggered and connected to the return air inlet 8.

[0042] In the above embodiments, by adjusting the height of the adjusting plate 13, different sets of through-holes 17 on the adjusting plate 13 can correspond to the return air vents 8. For example, when the adjusting plate 13 is fixed to the drying box 1 at the first height, there is one through-hole 17 on the adjusting plate 13 corresponding to the return air vent 8. At this time, all the return air vents 8 are connected to the return air duct 21. Therefore, the hot air vents 9 and return air vents 8 on the same layer form a laminar flow circulation. When the adjusting plate 13 is fixed to the drying box 1 at the second height, only half or one-third of the return air vents 8 are evenly spaced and correspond one-to-one with the through-holes 17 on the adjusting plate 13. At this time, when only half of the return air vents 8 are connected to the return air duct 21, the hot air in the closed state of the return air vents 8 can only pass upward through the material tray of the upper layer and return to the return air duct 21 from the return air vents 8 of the upper layer, thereby forming an axial flow circulation. The structure is simple, the cost is low, and the adjustment is more convenient.

[0043] like Figure 7 As shown, the top of the adjusting plate 13 is provided with a positioning member 18. The positioning member 18 extends out of the drying box 1 and is connected to the positioning rod 19. The positioning member 18 is provided with a plurality of insertion holes 20. The spacing between the insertion holes 20 matches the spacing between different sets of through holes 17.

[0044] In the above embodiment, the positioning member 18 extends out of the drying box 1, and then the insertion hole 20 is inserted into the lowest insertion hole 20. The insertion rod 19 is arranged horizontally and pressed against the top of the drying box 1, so the adjusting plate 13 will no longer slide down, thereby completing the height adjustment and fixing of the adjusting plate 13.

[0045] like Figure 3As shown, a first partition is installed on one side of the drying oven 1. The first partition is parallel to the side plate. A second partition 12 is installed between the first partition and the side plate. The second partition 12 is perpendicular to the first partition and the side plate respectively. The first partition and the oven body form a hot air circulation cavity. The second partition 12 divides the hot air circulation cavity into a vertically arranged hot air duct 11 and a return air duct 21.

[0046] In some specific embodiments, the first partition is provided with a plurality of L-shaped limiting members 14, the L-shaped limiting members 14 forming a vertical sliding groove, and the adjusting plate 13 is slidably disposed in the sliding groove so that the adjusting plate 13 can only slide vertically along the sliding groove.

[0047] A circulating fan is provided between the hot air duct 11 and the return air duct 21, and an electric heating device 15 is provided at the end of the hot air duct 11 near the circulating fan.

[0048] The aforementioned circulating fan draws air from the return air duct 21 and sends it into the hot air duct 11. The air entering the hot air duct 11 is heated by the electric heating device 15 and then continues to flow downwards, eventually entering the drying chamber 3 from the hot air outlet 9. The air in the drying chamber 3 is then circulated back into the return air duct 21 from the return air outlet 8.

[0049] In some specific embodiments, such as Figure 5 As shown, the circulating fan is installed on the top of the drying box 1. The air inlet of the circulating fan is connected to the return air duct 21, and the air outlet of the circulating fan is connected to the hot air duct 11. The circulating fan is a high-temperature long-shaft fan, and the electric heating device 15 is a finned heating tube 16.

[0050] The finned heating tube 16 is mounted on the frame, and the upper and lower parts of the frame are provided with openings so that the air entering the hot air duct 11 can pass through the finned heating tube 16 from top to bottom.

[0051] The top of the return air duct 21 is connected to the air inlet of the circulating fan via a pipe, and the top of the hot air duct 11 is connected to the air outlet of the circulating fan via a pipe.

[0052] In the above embodiment, after the circulating fan is powered on, it drives the internal impeller to rotate, thereby generating negative pressure at the air inlet to draw air from the return air duct 21. Then, the air is discharged into the hot air duct 11 through the air outlet. The air in the hot air duct 11 is heated by the electric heating device 15 and then sent into the drying chamber 3 through the hot air outlet 9.

[0053] In some specific embodiments, the circulating fan includes a high-temperature resistant blower motor 6, an axial impeller mounted on the output shaft of the high-temperature resistant blower motor 6, and a housing 5. The high-temperature resistant blower motor 6 is mounted on the housing 5, and the output shaft extends into the housing 5 and is connected to the axial impeller. One end of the housing 5 is provided with an air inlet and the other end is provided with an air outlet.

[0054] like Figure 1 As shown, the top of the drying chamber 3 is provided with an exhaust vent 2 and an exhaust fan.

[0055] When the humidity inside the drying chamber 3 is too high, the humidity sensor transmits the humidity information to the controller. After receiving the humidity information, the controller controls the exhaust fan to turn on, and the exhaust fan turns on to expel the hot and humid air from the drying chamber 3.

[0056] The drying oven 1 is equipped with a humidity sensor and a temperature sensor. A control box 10 is installed on one side of the drying oven 1. The humidity sensor, temperature sensor, electric heating device 15, and circulating fan are all connected to the controller in the control box 10.

[0057] Specifically, the controller can be a PLC controller or a microcontroller. In this embodiment, a PLC controller is selected. The power module of the PLC controller is connected to a 24VDC switching power supply. The control system of the drying oven 1 is connected to the equipment through the PLC controller: the temperature sensor is connected to the RTD module of the PLC controller, and the humidity sensor is connected to the analog input module through a transmitter. The digital output terminal of the PLC controller controls the trigger terminal of the solid-state relay through wires, thereby switching the power supply of the electric heating device 15 on and off; the digital output terminal of the PLC controller outputs 24VDC to the inverter terminal to control the start and stop of the circulating fan. The normally closed contact of the emergency stop button is connected to the digital input terminal of the PLC controller, and the inverter alarm signal is connected to the digital input terminal of the PLC controller to form a hardware protection circuit. The PLC processes the temperature signal from the temperature sensor and the humidity signal from the humidity sensor through a PID algorithm, outputs PWM pulses to control the heating power of the electric heating device 15, and adjusts the inverter frequency according to the humidity threshold to change the speed of the circulating fan, thereby achieving precise temperature and humidity control.

[0058] The humidity sensor, temperature sensor, electric heating device 15, and circulating fan are all connected to the controller and power supply in the control box 10 in a conventional manner. The process of controlling the temperature and humidity inside the drying oven 1, as well as the operation of the electric heating device 15, circulating fan, and exhaust fan, is also the same as the existing method, so it will not be described in detail here.

[0059] The body of the drying oven 1, as well as the first partition and the second partition 12, are all made of heat-insulating materials, thus playing a role in heat insulation.

[0060] For example, in some specific embodiments, the thermal insulation material is polyurethane rock wool board.

[0061] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A low-temperature slow-drying oven for Chinese medicinal herbs, characterized in that, Drying oven (1); the interior is equipped with a drying chamber (3), a hot air duct (11) and a return air duct (21); The drying chamber (3) is open on one side and is equipped with a sealing door (4). The drying chamber (3) has multiple sets of horizontal brackets (7) arranged vertically inside. The drying chamber (3) has multiple hot air inlets (9) and return air inlets (8) on one side of the hot air duct (11) and return air duct (21). The hot air inlets (9) and return air inlets (8) are arranged between the horizontal brackets (7). The hot air inlets (9) are connected to the hot air duct (11), and the return air inlets (8) are connected to the return air duct (21). A switch is installed at the return air vent (8) to allow for same-floor or staggered-floor return air.

2. The low-temperature slow-drying Chinese medicinal herb drying box according to claim 1, characterized in that, The return air duct (21) is vertically arranged. The return air duct (21) is slidably installed with a height-adjustable adjustment plate (13) on one side of the return air inlet (8). The adjustment plate (13) is provided with multiple through holes (17), and at least one set of through holes (17) corresponding one-to-one with the return air inlet (8) and at least one set of through holes (17) that are staggered and connected to the return air inlet (8).

3. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 2, characterized in that, The top of the adjusting plate (13) is provided with a positioning element (18), which extends out of the drying box (1) and is connected to the positioning rod (19). The positioning element (18) has multiple insertion holes (20), and the spacing between the insertion holes (20) matches the spacing between different sets of through holes (17).

4. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 1, characterized in that, A first partition is installed on one side of the drying oven (1). The first partition is parallel to the side plate. A second partition (12) is installed between the first partition and the side plate. The second partition (12) is perpendicular to the first partition and the side plate respectively. The first partition and the oven body form a hot air circulation cavity. The second partition (12) divides the hot air circulation cavity into a vertically arranged hot air duct (11) and a return air duct (21).

5. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 1, characterized in that, A circulating fan is provided between the hot air duct (11) and the return air duct (21), and an electric heating device (15) is provided at the end of the hot air duct (11) near the circulating fan.

6. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 5, characterized in that, The top of the return air duct (21) is connected to the air inlet of the circulating fan via a pipe, and the top of the hot air duct (11) is connected to the air outlet of the circulating fan via a pipe.

7. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 1, characterized in that, The top of the drying chamber (3) is provided with an exhaust vent (2) and an exhaust fan.

8. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 1, characterized in that, The drying oven (1) is equipped with a humidity sensor and a temperature sensor. A control box (10) is installed on one side of the drying oven (1). The humidity sensor, temperature sensor, electric heating device (15) and circulating fan are all connected to the controller in the control box (10).

9. The low-temperature slow-drying traditional Chinese medicinal material drying box according to claim 4, characterized in that, The body of the drying oven (1) and the first partition and the second partition (12) are all made of heat insulation materials.

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