Belt dryer

Abstract

The present invention discloses a belt dryer, which relates to the technical field of Chinese herbal medicine production. The belt dryer includes a machine cover, a mesh belt, a conveying device, a first circulation unit and a second circulation unit; a first circulation chamber, a drying chamber and a second circulation chamber are arranged in the machine cover in a top-down manner. The front end of the drying chamber has a feeding port, and the rear end of the drying chamber has a discharging port; the mesh belt is arranged in the drying chamber and is used for carrying the herbs to be dried; the conveying device is used to drive the mesh belt to move so as to drive the herbs to be dried from the feeding port to the discharging port; the first circulation unit is arranged on the side of the mesh belt and supplies high-temperature gas into the drying chamber from bottom to top; the second circulation unit is arranged on the side of the mesh belt and supplies high-temperature gas into the drying chamber from top to bottom. This solution can make the high-temperature gas flow directly contact the herbs to be dried from multiple directions, increasing the contact area between the high-temperature gas flow and the herbs to be dried, making the heat exchange more sufficient, thereby improving the drying uniformity and drying efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of traditional Chinese medicine production, and particularly to a belt dryer. Background Art

[0002] The production of traditional Chinese medicine generally includes processes such as cleaning, washing, moistening, cutting, drying, and packaging. Among them, the drying process is used to remove the moisture contained in traditional Chinese medicine, prevent mildew or rot due to excessive moisture in traditional Chinese medicine, and at the same time helps to maintain the color, aroma, and active ingredients of traditional Chinese medicine, and avoid the loss or denaturation of active ingredients due to moisture.

[0003] The drying process of traditional Chinese medicine usually uses a belt dryer. The belt dryer uses hot air to dry the traditional Chinese medicine laid flat on the mesh belt, which has the advantages of high drying efficiency and suitability for batch continuous production. However, after some traditional Chinese medicines are dried by the existing belt dryer, there is still a problem that the drying of some local positions is not thorough, which has an adverse effect on the finished product quality of traditional Chinese medicine. Summary of the Invention

[0004] The main object of the present invention is to propose a belt dryer, aiming to improve the drying uniformity of the belt dryer and avoid the problem that the drying of some local positions of traditional Chinese medicine is not thorough.

[0005] To achieve the above object, the belt dryer proposed by the present invention includes:

[0006] A machine cover, which is internally provided with a first circulation chamber, a drying chamber, and a second circulation chamber arranged from top to bottom. The front end of the drying chamber has a feeding port, and the rear end of the drying chamber has a discharging port;

[0007] A mesh belt, which is arranged in the drying chamber and is used to carry the medicinal materials to be dried;

[0008] A conveying device, which is used to drive the mesh belt to move so as to drive the medicinal materials to be dried to be conveyed from the feeding port to the discharging port;

[0009] A first circulation unit, which is arranged on the side of the mesh belt; the first circulation unit includes a first air extraction device, a first condenser, a first heat exchanger, and a first air supply device arranged from top to bottom; the first air supply device is used to push the gas in the second circulation chamber to pass through the mesh belt from bottom to top and reach the first circulation chamber; the first air extraction device is used to suck the gas in the first circulation chamber to the first condenser for condensation; the first heat exchanger is used to heat the dry gas obtained by condensing in the first condenser and then convey it to the second circulation chamber;

[0010] The second circulation unit is arranged at the side of the mesh belt; the second circulation unit includes a second air extraction device, a second condenser, a second heat exchanger and a second air supply device arranged from bottom to top; the second air supply device is used to push the gas in the first circulation chamber to pass through the mesh belt from top to bottom and reach the second circulation chamber; the second air extraction device is used to suck the gas in the second circulation chamber to the second condenser for condensation; the second heat exchanger is used to heat the dry gas obtained by condensing in the second condenser and then transport it to the first circulation chamber.

[0011] In an embodiment, there is a height difference between the feed inlet and the discharge outlet. The mesh belt includes at least two sections arranged at intervals in the height direction. The section at the uppermost position is docked with the feed inlet, and the section at the lowermost position is docked with the discharge outlet; the conveying device is used to drive the mesh belt to move, so as to drive the medicinal materials to be dried to sequentially pass through each section from top to bottom, so that the medicinal materials to be dried complete at least two folding movements between the front end and the rear end of the drying chamber.

[0012] In an embodiment, the connection line between the feed inlet and the discharge outlet on the horizontal projection plane forms a first path, and the first circulation unit and the second circulation unit are arranged alternately along the first path.

[0013] In an embodiment, the first circulation chamber is provided with a first humidity sensor, and the first humidity sensor is electrically connected to the second circulation unit. The first humidity sensor is used to detect the first ambient humidity in the first circulation chamber;

[0014] The first humidity sensor is used to send an opening signal to the second circulation unit when the first ambient humidity is higher than the first humidity threshold, so as to trigger the second circulation unit to start running; and the first humidity sensor is used to send a closing signal to the second circulation unit when the first ambient humidity is lower than the second humidity threshold, so as to trigger the second circulation unit to stop running, and the second humidity threshold is less than the first humidity threshold.

[0015] In an embodiment, the belt dryer further includes an exhaust fan. The exhaust fan is installed on the hood, and the exhaust fan is communicated with the first circulation chamber and the second circulation chamber;

[0016] The first circulation chamber is provided with a third humidity sensor, and the third humidity sensor is electrically connected to the exhaust fan. The third humidity sensor is used to detect the third ambient humidity in the first circulation chamber; the third humidity sensor is used to send a first exhaust signal to the exhaust fan when the third ambient humidity is higher than the third humidity threshold, so as to trigger the exhaust fan to exhaust the gas in the first circulation chamber to the outside of the hood;

[0017] And / or, the second circulation chamber is provided with a fourth humidity sensor, which is electrically connected to the moisture exhaust fan. The fourth humidity sensor is used to detect the fourth ambient humidity of the second circulation chamber; the fourth humidity sensor is used to send a second exhaust signal to the moisture exhaust fan when the fourth ambient humidity is higher than a fourth humidity threshold, so as to trigger the moisture exhaust fan to exhaust the gas in the second circulation chamber to the outside of the hood.

[0018] In one embodiment, the belt dryer further includes a makeup air fan, which is installed on the hood and is communicated with the first circulation chamber and the second circulation chamber;

[0019] The makeup air fan is electrically connected to the third humidity sensor; when the makeup air fan receives the first exhaust signal sent by the third humidity sensor, the makeup air fan is used to supplement external gas into the first circulation chamber after a first preset time;

[0020] And / or, the makeup air fan is electrically connected to the fourth humidity sensor; when the makeup air fan receives the second exhaust signal sent by the fourth humidity sensor, the makeup air fan is used to supplement external gas into the second circulation chamber after a second preset time.

[0021] In one embodiment, a first air guiding structure is arranged in the drying chamber. The first air guiding structure has a spiral first air guiding channel. The air inlet end of the first air guiding channel faces the first circulation chamber, and the air outlet end of the first air guiding channel faces the upper side of the mesh belt;

[0022] And / or, a second air guiding structure is arranged in the drying chamber. The second air guiding structure has a spiral second air guiding channel. The air inlet end of the second air guiding channel faces the second circulation chamber, and the air outlet end of the second air guiding channel faces the lower side of the mesh belt.

[0023] In one embodiment, the first air guiding structure is provided with a first through-flow hole penetrating along the vertical direction, and the first through-flow hole is communicated with the first air guiding channel;

[0024] And / or, the second air guiding structure is provided with a second through-flow hole penetrating along the vertical direction, and the second through-flow hole is communicated with the second air guiding channel.

[0025] In one embodiment, the belt dryer further includes a first driving motor, which is connected to the first air guiding structure. The first driving motor is used to drive the first air guiding structure to rotate around the axis of the first air guiding channel;

[0026] And / or, the belt dryer further includes a second driving motor, which is connected to the second air guiding structure, and the second driving motor is used to drive the second air guiding structure to rotate around the axis of the second air guiding channel.

[0027] In one embodiment, a cleaning device is arranged in the drying chamber, and the water outlet end of the cleaning device is arranged towards the gap part of the mesh belt; the belt dryer further includes a collecting pipeline, the first end of the collecting pipeline is connected to the condensate outlet of the first condenser and the condensate outlet of the second condenser, and the second end of the collecting pipeline is connected to the water inlet end of the cleaning device.

[0028] In the technical solution of the present invention, by setting the first circulation unit and the second circulation unit, hot air can be conveyed to the mesh belt from bottom to top and from top to bottom, rather than being limited to the single form of traditional upward air supply. Moreover, the intersection between the upward air flow part supplied into the drying chamber by the first circulation unit and the downward air flow part supplied into the drying chamber by the second circulation unit can disperse the air flow and make it flow in multiple directions. In this way, the direct contact area between the high-temperature air flow and the medicinal materials to be dried can be increased, and the heat exchange between the high-temperature air flow and the medicinal materials to be dried can be more sufficient, thereby improving the drying uniformity and drying efficiency, and enabling the medicinal materials to obtain a better drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a front view structural schematic diagram of an embodiment of the belt dryer provided by the present invention;

[0031] Figure 2 It is a top view structural schematic diagram of an embodiment of the belt dryer provided by the present invention;

[0032] Figure 3 It is a side view structural schematic diagram of an embodiment of the belt dryer provided by the present invention;

[0033] Figure 4 It is a working schematic diagram of the first circulation unit in an embodiment of the belt dryer provided by the present invention;

[0034] Figure 5 It is a working schematic diagram of the second circulation unit in an embodiment of the belt dryer provided by the present invention;

[0035] Figure 6 Schematic perspective view of the first air guiding structure in an embodiment of the belt dryer provided by the present invention.

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Hood; 101. First circulation chamber; 102. Drying chamber; 103. Second circulation chamber; 104. Feed inlet; 105. Discharge outlet;

[0038] 2. Mesh belt;

[0039] 3. Medicinal materials to be dried;

[0040] 4. Conveying device;

[0041] 5. First circulation unit; 501. First air extraction device; 502. First condenser; 503. First heat exchanger; 504. First air supply device;

[0042] 6. Second circulation unit; 601. Second air extraction device; 602. Second condenser; 603. Second heat exchanger; 604. Second air supply device;

[0043] 7. Moisture exhaust fan;

[0044] 8. Air supplement fan;

[0045] 9. First air guiding structure; 901. First air guiding channel; 902. First through-flow hole;

[0046] 10. Second air guiding structure;

[0047] 11. Converging pipeline.

[0048] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unachievable, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The production of traditional Chinese medicinal materials generally includes processes such as cleaning, washing, moistening, cutting, drying, and packaging. Among them, the drying process is used to remove the moisture contained in traditional Chinese medicinal materials, prevent mildew or rot of traditional Chinese medicinal materials due to excessive moisture, and at the same time help maintain the color, aroma, and active ingredients of traditional Chinese medicinal materials, avoiding the loss or denaturation of active ingredients due to moisture. The drying process of traditional Chinese medicinal materials usually uses a belt dryer. The belt dryer uses hot air to dry the traditional Chinese medicinal materials laid flat on the mesh belt, and it has advantages such as high drying efficiency and suitability for batch continuous production. However, after some traditional Chinese medicinal materials are dried by the existing belt dryer, there are still problems of incomplete drying in local positions, which has an adverse impact on the finished product quality of traditional Chinese medicinal materials.

[0053] The R & D personnel of this application found through research that the direction of the existing belt dryer for delivering hot air to the mesh belt is relatively single. The most common is to deliver hot air to the mesh belt from bottom to top, so that the high-temperature air flow passes through the holes of the mesh belt upward to dry the traditional Chinese medicinal materials carried on the mesh belt. At the same time, by virtue of the upward property of the high-temperature air flow, the traditional Chinese medicinal materials on the mesh belt can be blown up under a certain air pressure, enabling the traditional Chinese medicinal materials to be turned over, so that the upward air flow can contact different surfaces of the traditional Chinese medicinal materials, obtaining a relatively high drying uniformity. However, for traditional Chinese medicinal materials with relatively heavy quality, or when the stacking thickness of traditional Chinese medicinal materials on the mesh belt is relatively thick, the upward air flow may be difficult to effectively drive the traditional Chinese medicinal materials to turn over. In this way, the direct contact area between the upward air flow and the traditional Chinese medicinal materials is limited, resulting in the problem of incomplete drying ultimately.

[0054] To solve the above problems, the present invention provides a belt dryer, aiming to deliver hot air to the mesh belt from multiple directions, so as to increase the direct contact area between the air flow and the traditional Chinese medicinal materials, enable the air flow to take away the moisture contained in the traditional Chinese medicinal materials from multiple directions, and make the final drying effect of the traditional Chinese medicinal materials more sufficient.

[0055] Please refer to Figures 1 to 5, the belt dryer provided by the present invention includes:

[0056] A machine hood 1, which is internally provided with a first circulation chamber 101, a drying chamber 102, and a second circulation chamber 103 arranged from top to bottom. The front end of the drying chamber 102 has a feeding port 104, and the rear end of the drying chamber 102 has a discharging port 105;

[0057] A mesh belt 2, which is arranged in the drying chamber 102, and the mesh belt 2 is used to carry the medicinal materials 3 to be dried;

[0058] A conveying device 4, which is used to drive the mesh belt 2 to move, so as to drive the medicinal materials 3 to be dried from the feeding port 104 to the discharging port 105;

[0059] A first circulation unit 5, which is arranged on the side of the mesh belt 2; the first circulation unit 5 includes a first air extraction device 501, a first condenser 502, a first heat exchanger 503, and a first air supply device 504 arranged from top to bottom; the first air supply device 504 is used to push the gas in the second circulation chamber 103 to pass through the mesh belt 2 from bottom to top and reach the first circulation chamber 101; the first air extraction device 501 is used to suck the gas in the first circulation chamber 101 to the first condenser 502 for condensation; the first heat exchanger 503 is used to heat the dry gas obtained by condensing the first condenser 502 and then transport it to the second circulation chamber 103;

[0060] A second circulation unit 6, which is arranged on the side of the mesh belt 2; the second circulation unit 6 includes a second air extraction device 601, a second condenser 602, a second heat exchanger 603, and a second air supply device 604 arranged from bottom to top; the second air supply device 604 is used to push the gas in the first circulation chamber 101 to pass through the mesh belt 2 from top to bottom and reach the second circulation chamber 103; the second air extraction device 601 is used to suck the gas in the second circulation chamber 103 to the second condenser 602 for condensation; the second heat exchanger 603 is used to heat the dry gas obtained by condensing the second condenser 602 and then transport it to the first circulation chamber 101.

[0061] In this embodiment, the front end of the drying chamber 102 refers to the end of the belt dryer for connecting to the upper-level process equipment (such as a system for cutting traditional Chinese medicinal materials), and the rear end of the drying chamber 102 refers to the end of the belt dryer for connecting to the lower-level process equipment (such as a system for packaging traditional Chinese medicinal materials); after the medicinal materials 3 to be dried output by the upper-level process equipment enter the belt dryer through the feeding port 104, the medicinal materials 3 to be dried will complete the drying operation in the belt dryer and finally be output to the lower-level process equipment through the discharging port 105.

[0062] The laying path of the mesh belt 2 in the drying chamber 102 forms a conveying line for the medicinal materials 3 to be dried. This conveying line can be flexibly set according to the layout inside the machine hood 1 and the actual drying requirements, and is not limited to being directly connected from the feeding port 104 to the discharging port 105. The conveying device 4 may include a motor and a matching transmission mechanism. The conveying device 4 can drive the continuous movement of the mesh belt 2 to convey the medicinal materials 3 to be dried from the feeding port 104 to the discharging port 105 along the conveying line of the mesh belt 2.

[0063] The first circulation unit 5 and the second circulation unit 6 can be respectively arranged on both sides of the mesh belt 2 or alternately arranged on one side of the mesh belt 2; during the process of conveying the medicinal materials 3 to be dried in the drying chamber 102, the first circulation unit 5 and the second circulation unit 6 can respectively perform drying operations on the medicinal materials 3 to be dried. As Figure 4 shown, for the first circulation unit 5, the first heat exchanger 503 can transfer the heat of the heat source (such as steam, hot oil or electric heater) to the air, realize the heating operation of the air, and supply the heated high-temperature gas into the second circulation chamber 103; the first air supply device 504 can use a blower, and can convey the high-temperature gas in the second circulation chamber 103 to the upper drying chamber 102. During the process that the high-temperature gas passes through the mesh belt 2 from bottom to top, it can exchange heat with the medicinal materials 3 to be dried on the mesh belt 2, and then the gas can carry the moisture evaporated from the medicinal materials 3 to be dried and enter the first circulation chamber 101 above the drying chamber 102 in the form of water vapor, thus completing the primary drying operation on the medicinal materials 3 to be dried; the first air extraction device 501 can use a blower, and can suck the water vapor in the first circulation chamber 101 to the first condenser 502; the first condenser 502 can condense the moisture in the water vapor into liquid water through a cooling medium. This liquid condensed water can be discharged outward or used after recovery, and the dried gas obtained after the condensation operation enters the lower first heat exchanger 503. The first heat exchanger 503 can heat this part of the dried gas and continue to supply it into the second circulation chamber 103 to repeat the above drying process, continue to perform drying operations on the medicinal materials 3 to be dried in the drying chamber 102, and form an internal circulation. Similarly, as Figure 5As shown, for the second circulation unit 6, the second heat exchanger 603 can transfer the heat of a heat source (such as steam, hot oil or an electric heater) to air, realizing the heating operation of the air, and supply the heated high-temperature gas into the first circulation chamber 101; the second air supply device 604 can use a blower, and can convey the high-temperature gas in the first circulation chamber 101 downward to the drying chamber 102. During the process that the high-temperature gas passes through the mesh belt 2 from top to bottom, heat exchange can occur with the medicinal materials 3 to be dried on the mesh belt 2. Then the gas can carry the moisture evaporated from the medicinal materials 3 to be dried and enter the second circulation chamber 103 below the drying chamber 102 in the form of water vapor, thereby completing the primary drying operation of the medicinal materials 3 to be dried; the second air extraction device 601 can use a blower, and can suck the water vapor in the second circulation chamber 103 to the second condenser 602; the second condenser 602 can condense the moisture in the water vapor into liquid water through a cooling medium. This liquid condensed water can be discharged outward or used after recovery, while the dried gas obtained after the condensation operation enters the second heat exchanger 603 above. The second heat exchanger 603 can heat this part of the dried gas and continue to supply it into the first circulation chamber 101 to repeat the above drying process, continue to dry the medicinal materials 3 to be dried in the drying chamber 102, and form an internal circulation.

[0064] In addition, during the simultaneous operation of the first circulation unit 5 and the second circulation unit 6, a confluence will occur between a part of the upward airflow supplied by the first circulation unit 5 to the drying chamber 102 and a part of the downward airflow supplied by the second circulation unit 6 to the drying chamber 102, causing the airflow to disperse and flow in multiple directions, rather than being limited to a single vertical upward or vertical downward flow direction. Thus, the airflow can directly contact the medicinal materials 3 to be dried from multiple angles, making the drying effect more sufficient and the drying efficiency higher.

[0065] Regarding the specific working principles of the first circulation unit 5 and the second circulation unit 6, reference can be made to the existing air conditioning system. Its circulation process can also be assisted by a boosting device (compressor) and a pressure-reducing device (expansion valve), not limited to heat exchangers and condensers, and will not be elaborated here one by one. Preferably, the first air supply device 504 and the second air supply device 604 can both be equipped with corresponding air distributors to distribute the high-temperature gas to each area of the drying chamber 102 according to the drying requirements, so as to ensure that the medicinal materials 3 to be dried are evenly heated during the drying process, thereby improving the drying efficiency and quality.

[0066] It can be seen that in this embodiment, by providing the first circulation unit 5 and the second circulation unit 6, hot air can be conveyed to the mesh belt 2 from bottom to top and from top to bottom, without being limited to the traditional single form of upward air supply. Moreover, the intersection between the partial upward air flow fed into the drying chamber 102 by the first circulation unit 5 and the partial downward air flow fed into the drying chamber 102 by the second circulation unit 6 can cause the air flow to disperse and flow in multiple directions. In this way, the direct contact area between the high-temperature air flow and the medicinal materials 3 to be dried can be increased, and the heat exchange between the high-temperature air flow and the medicinal materials 3 to be dried can be made more sufficient, thereby improving the drying uniformity and drying efficiency, and enabling the medicinal materials to obtain a better drying effect.

[0067] Optionally, referring to Figures 1 to 5 , there is a height difference between the feed inlet 104 and the discharge outlet 105. The mesh belt 2 includes at least two layers (not shown in the figure) arranged at intervals in the height direction. The uppermost layer is docked with the feed inlet 104, and the lowermost layer is docked with the discharge outlet 105; the conveying device 4 is used to drive the mesh belt 2 to move, so as to drive the medicinal materials 3 to be dried to pass through each layer from top to bottom in turn, so that the medicinal materials 3 to be dried complete at least two folding movements between the front end and the rear end of the drying chamber 102.

[0068] In one implementation manner, the mesh belt 2 can be a continuous structure. One end of the mesh belt 2 is docked with the feed inlet 104, and the other end of the mesh belt 2 is docked with the discharge outlet 105. The middle part of the mesh belt 2 undergoes multiple turns between the front end and the rear end of the drying chamber 102 to form a multi-layer serpentine structure. At this time, the corresponding part of each layer of the mesh belt 2 constitutes a layer; each turning position of the mesh belt 2 can be wound around a driving wheel. By driving one of the driving wheels to rotate in a fixed direction by the conveying device 4, the medicinal materials 3 on the mesh belt 2 can be driven to finally reach the discharge outlet 105 after passing through multiple folds from the feed inlet 104.

[0069] In another implementation manner, the mesh belt 2 can also be divided into multiple discontinuous parts, and each part constitutes a layer. The conveying device 4 can drive each group of adjacent two layers to move in opposite directions through the corresponding transmission mechanism; based on this setting, when the medicinal materials 3 on one layer are conveyed from the front end to the rear end, this part of the medicinal materials 3 to be dried can fall onto the next layer, and then be conveyed from the rear end to the front end. In this way, by repeating the folding, it is also possible to drive the medicinal materials 3 to be dried to finally reach the discharge outlet 105 after passing through multiple folds from the feed inlet 104.

[0070] Based on the above settings, the height space inside the hood 1 can be fully utilized, and the residence time of the medicinal materials 3 to be dried in the drying chamber 102 can be increased without changing the floor area of the hood 1, so that the moisture contained in the medicinal materials 3 to be dried evaporates more thoroughly, thereby obtaining a better drying effect.

[0071] Optionally, referring to Figures 1 to 5 , the connection line between the inlet 104 and the outlet 105 on the horizontal projection plane forms a first path, and the first circulation unit 5 and the second circulation unit 6 are arranged alternately along the first path.

[0072] As an example, the drying chamber 102 is divided into four regions along the first path and sorted in sequence. If the first circulation unit 5 is set in the first region, then the second circulation unit 6 must be set in the second region, the first circulation unit 5 must be set in the third region, and the second circulation unit 6 must be set in the fourth region; similarly, if the second circulation unit 6 is set in the first region, then the first circulation unit 5 must be set in the second region, the second circulation unit 6 must be set in the third region, and the first circulation unit 5 must be set in the fourth region; among them, the first circulation unit 5 and the second circulation unit 6 can be set on the same side or different sides of the mesh belt 2, which is not limited here.

[0073] Based on the above alternating arrangement form, it is possible to avoid the situation where the first circulation unit 5 and the second circulation unit 6 are respectively arranged on both sides of the mesh belt 2 and the first circulation unit 5 is directly opposite to the second circulation unit 6. While ensuring that there is a certain degree of intersection of some high-temperature airflows of the first circulation unit 5 and some high-temperature airflows of the second circulation unit 6 in the drying chamber 102 to increase the gas flow direction and improve the drying effect, it can maximize the avoidance of the mutual interference of the high-temperature drying gas of the first circulation unit 5 and the water vapor of the second circulation unit 6 in the second circulation chamber 103, and avoid the mutual interference of the water vapor of the first circulation unit 5 and the high-temperature drying gas of the second circulation unit 6 in the first circulation chamber 101, so as to minimize the negative impact generated between the drying operation of the first circulation unit 5 and the drying operation of the second circulation unit 6.

[0074] Optionally, referring to Figures 1 to 5 , the first circulation chamber 101 is provided with a first humidity sensor (not shown in the figure), the first humidity sensor is electrically connected to the second circulation unit 6, and the first humidity sensor is used to detect the first ambient humidity of the first circulation chamber 101;

[0075] The first humidity sensor is used to send an opening signal to the second circulation unit 6 when the first ambient humidity is higher than the first humidity threshold to trigger the second circulation unit 6 to start running; and the first humidity sensor is used to send a closing signal to the second circulation unit 6 when the first ambient humidity is lower than the second humidity threshold to trigger the second circulation unit 6 to stop running, and the second humidity threshold is less than the first humidity threshold.

[0076] In practical applications, the air flow circulation direction of the first circulation unit 5 conforms to the flow characteristics of gas at different temperatures (hot gas rises and cold gas descends). Therefore, devices such as the first exhaust device 501 and the first air supply device 504 for driving the gas flow in the first circulation unit 5 can achieve the above-mentioned air flow circulation with relatively low energy consumption. Moreover, the upward air flow in the drying chamber 102 helps drive the medicinal materials 3 to be dried laid on the mesh belt 2 to turn over, enabling the medicinal materials 3 to be dried to have more sufficient contact with the hot air flow. However, the air flow circulation direction of the second circulation unit 6 does not conform to the flow characteristics of gas at different temperatures (hot gas rises and cold gas descends). Therefore, devices such as the second exhaust device 601 and the second air supply device 604 for driving the gas flow in the second circulation unit 6 need to consume a large amount of energy to overcome the flow characteristics of the gas itself and achieve the above-mentioned air flow circulation. Additionally, the downward air flow in the drying chamber 102 is difficult to drive the medicinal materials 3 to be dried laid on the mesh belt 2 to turn over.

[0077] It can be seen from this that the first circulation unit 5 can obtain a better drying effect with relatively low energy consumption, that is, the performance-price ratio of using the first circulation unit 5 for drying operation is higher than that of using the second circulation unit 6 for drying operation. Based on the above considerations, in this embodiment, the first circulation unit 5 is preferentially used for drying operation, and the second circulation unit 6 is in a non-working state. When the first humidity sensor detects that the first ambient humidity in the first circulation chamber 101 is higher than the first humidity threshold, it indicates that the medicinal materials 3 to be dried in this batch contain more moisture, and relying solely on the first circulation unit 5 may not achieve the expected drying effect. Then, by sending an activation signal, the second circulation unit 6 is triggered to operate (specifically, triggering the first exhaust device 501, the first condenser 502, the first heat exchanger 503, and the first air supply device 504 to operate) to assist the first circulation unit 5 in jointly performing the drying operation. After the second circulation unit 6 has been operating for a period of time, if the first humidity sensor detects that the first ambient humidity in the first circulation chamber 101 is lower than the second humidity threshold, it can be explained that the medicinal materials 3 to be dried contain less moisture at this time, and the expected drying effect can be obtained through the first circulation unit 5. At this time, the second circulation unit 6 is triggered to stop operating by sending a shutdown signal (specifically, triggering the second exhaust device 601, the second condenser 602, the second heat exchanger 603, and the second air supply device 604 to operate).

[0078] Based on the above settings, the drying operation of the first circulation unit 5 and the drying operation of the second circulation unit 6 can be automatically and reasonably allocated according to the actual drying requirements, so that a better drying effect can be obtained with relatively low energy consumption.

[0079] Optionally, referring to Figures 1 to 5 , the belt dryer further includes a moisture exhaust fan 7. The moisture exhaust fan 7 is installed on the machine cover 1, and the moisture exhaust fan 7 is communicated with the first circulation chamber 101 and the second circulation chamber 103.

[0080] The first circulation chamber 101 is provided with a third humidity sensor (not shown in the figure), the third humidity sensor is electrically connected to the moisture exhaust fan 7, and the third humidity sensor is used to detect the third ambient humidity of the first circulation chamber 101; the third humidity sensor is used to send a first exhaust signal to the moisture exhaust fan 7 when the third ambient humidity is higher than the third humidity threshold, so as to trigger the moisture exhaust fan 7 to exhaust the gas in the first circulation chamber 101 to the outside of the machine cover 1;

[0081] And / or, the second circulation chamber 103 is provided with a fourth humidity sensor (not shown in the figure), the fourth humidity sensor is electrically connected to the moisture exhaust fan 7, and the fourth humidity sensor is used to detect the fourth ambient humidity of the second circulation chamber 103; the fourth humidity sensor is used to send a second exhaust signal to the moisture exhaust fan 7 when the fourth ambient humidity is higher than the fourth humidity threshold, so as to trigger the moisture exhaust fan 7 to exhaust the gas in the second circulation chamber 103 to the outside of the machine cover 1.

[0082] Specifically, when the third humidity sensor detects that the third ambient humidity of the first circulation chamber 101 is higher than the third humidity threshold, it can be considered that the humidity of the first circulation chamber 101 is too high at this time (that is, higher than the preset moisture exhaust critical value), then the first exhaust signal can be sent to trigger the moisture exhaust fan 7 to discharge the gas with too high humidity in the first circulation chamber 101 to the outside of the machine cover 1, so as to prevent this part of the gas with too high humidity from entering the internal circulation process of the first circulation unit 5 and causing a great burden on the first condenser 502. Similarly, when the fourth humidity sensor detects that the fourth ambient humidity of the second circulation chamber 103 is higher than the fourth humidity threshold, it can be considered that the humidity of the second circulation chamber 103 is too high at this time (that is, higher than the preset moisture exhaust critical value), then the second exhaust signal can be sent to trigger the moisture exhaust fan 7 to discharge the gas with too high humidity in the second circulation chamber 103 to the outside of the machine cover 1, so as to prevent this part of the gas with too high humidity from entering the internal circulation process of the second circulation unit 6 and causing a great burden on the second condenser 602.

[0083] Wherein, an air regulating plate can be arranged inside the moisture exhaust fan 7, and the air regulating plate can effectively control the moisture exhaust amount, so that the moisture exhaust fan 7 can accurately exhaust moisture to the preset moisture exhaust bottom limit after starting.

[0084] Optionally, referring to Figures 1 to 5 , the belt dryer further includes a supplementary air fan 8, the supplementary air fan 8 is installed on the machine cover 1, and the supplementary air fan 8 is communicated with the first circulation chamber 101 and the second circulation chamber 103;

[0085] The supplementary air fan 8 is electrically connected to the third humidity sensor; when the supplementary air fan 8 receives the first exhaust signal sent by the third humidity sensor, the supplementary air fan 8 is used to supplement external gas into the first circulation chamber 101 after a first preset time;

[0086] Moreover, and / or, the air supplement fan 8 is electrically connected to the fourth humidity sensor; when the air supplement fan 8 receives the second exhaust signal sent by the fourth humidity sensor, the air supplement fan 8 is configured to supplement external gas into the second circulation chamber 103 after a second preset time.

[0087] Based on the dehumidification operation of the dehumidification fan 7 in the previous embodiment, after the gas with too high humidity is discharged outside the hood 1, the amount of gas available for internal circulation in the hood 1 will decrease; in response to this, an air supplement fan 8 is correspondingly provided in this embodiment to automatically supplement external gas into the hood 1 through the air supplement fan 8 after dehumidification is completed to ensure the total amount of gas used for internal circulation. Among them, when the third humidity sensor sends the first exhaust signal to the dehumidification fan 7, the air supplement fan 8 can receive this first exhaust signal at the same time. At this time, the air supplement fan 8 can perform the air supplement operation after a first preset time based on a preset program; similarly, when the fourth humidity sensor sends the second exhaust signal to the dehumidification fan 7, the air supplement fan 8 can receive this second exhaust signal at the same time. At this time, the air supplement fan 8 can perform the air supplement operation after a second preset time based on a preset program; the above operations can ensure that the gas with too high humidity discharged by the dehumidification fan 7 is fully diluted in the external air and then the air supplement operation is performed, avoiding the air supplement fan 8 directly supplementing the external gas with too high humidity into the hood 1 for internal circulation again.

[0088] Preferably, the air supplement fan 8 and the dehumidification fan 7 are arranged at a preset distance from each other to avoid, to the greatest extent, the air supplement fan 8 directly supplementing the gas with too high humidity discharged by the dehumidification fan 7 into the hood 1 again.

[0089] Optionally, referring to Figure 4 and Figure 6 , a first air guiding structure 9 is provided in the drying chamber 102. The first air guiding structure 9 has a spiral first air guiding channel 901. The air inlet end of the first air guiding channel 901 faces the first circulation chamber 101, and the air outlet end of the first air guiding channel 901 faces the upper side of the mesh belt 2.

[0090] Optionally, referring to Figure 5 , a second air guiding structure 10 is provided in the drying chamber 102. The second air guiding structure 10 has a spiral second air guiding channel (not shown in the figure). The air inlet end of the second air guiding channel faces the second circulation chamber 103, and the air outlet end of the second air guiding channel faces the lower side of the mesh belt 2.

[0091] By providing the first air guiding structure 9, the high-temperature air flow conveyed upward by the first air supply device 504 can be supplied into the drying chamber 102 in a spiral upward flow direction after passing through the first air guiding channel 901, so that the flow direction of the gas is not limited to a single vertical upward direction; similarly, by providing the second air guiding structure 10, the high-temperature air flow conveyed downward by the second air supply device 604 can be supplied into the drying chamber 102 in a spiral downward flow direction after passing through the second air guiding channel, so that the flow direction of the gas is not limited to a single vertical downward direction. Based on the above settings, the gas can come into direct contact with the medicinal materials 3 to be dried from more different angles, further increasing the contact area between the gas and the medicinal materials 3 to be dried, thereby further improving the final drying effect.

[0092] Optionally, referring to Figure 4 and Figure 6 , the first air guiding structure 9 is provided with a first through-flow hole 902 penetrating in the vertical direction, and the first through-flow hole 902 is communicated with the first air guiding channel 901.

[0093] Optionally, referring to Figure 5 , the second air guiding structure 10 is provided with a second through-flow hole (not shown in the figure) penetrating in the vertical direction, and the second through-flow hole is communicated with the second air guiding channel.

[0094] By providing the first through-flow hole 902, when the high-temperature air flow conveyed upward by the first air supply device 504 spirally flows along the first air guiding channel 901, part of the air flow can pass through the first through-flow hole 902 and flow vertically upward, so that the air flow finally supplied into the drying chamber 102 is not limited to the spiral upward direction; in addition, part of the air flow passing through the first through-flow hole 902 can also intersect with the air flow flowing along the first air guiding channel 901 to generate turbulence, so that the air flow finally supplied into the drying chamber 102 is further dispersed, further expanding the flow direction of the gas, so that the gas can come into direct contact with the medicinal materials 3 to be dried from more different angles, thereby further increasing the contact area between the gas and the medicinal materials 3 to be dried and further improving the final drying effect.

[0095] Similarly, by providing the second air passing hole, when the high-temperature air flow delivered downward by the second air supply device 604 flows spirally along the second air guiding channel, part of the air flow can pass through the second air passing hole and flow vertically downward, so that the air flow finally supplied into the drying chamber 102 is not limited to the direction of spiral descent; in addition, part of the air flow passing through the second air passing hole can also intersect with the air flow flowing along the second air guiding channel to generate turbulence, so that the air flow finally supplied into the drying chamber 102 is further dispersed, thereby further expanding the flow direction of the gas, enabling the gas to make direct contact with the medicinal materials 3 to be dried from more different angles, thereby further increasing the contact area between the gas and the medicinal materials 3 to be dried and further improving the final drying effect.

[0096] Optionally, referring to Figure 4 , the belt dryer further includes a first driving motor (not shown in the figure), the first driving motor is connected to the first air guiding structure 9, and the first driving motor is used to drive the first air guiding structure 9 to rotate around the axis of the first air guiding channel 901.

[0097] Optionally, referring to Figure 5 , the belt dryer further includes a second driving motor (not shown in the figure), the second driving motor is connected to the second air guiding structure 10, and the second driving motor is used to drive the second air guiding structure 10 to rotate around the axis of the second air guiding channel.

[0098] By driving the first air guiding structure 9 to rotate through the first driving motor, the direction of the gas flowing into the drying chamber 102 along the first air guiding channel 901 can be continuously changed, so that the gas can make direct contact with the medicinal materials 3 to be dried from more different angles, thereby further increasing the contact area between the gas and the medicinal materials 3 to be dried, making the final drying effect more sufficient and uniform. Wherein, the axis of the first air guiding channel 901 refers to the central axis corresponding to its spiral line.

[0099] Similarly, by driving the second air guiding structure 10 to rotate through the second driving motor, the direction of the gas flowing into the drying chamber 102 along the second air guiding channel can be continuously changed, so that the gas can make direct contact with the medicinal materials 3 to be dried from more different angles, thereby further increasing the contact area between the gas and the medicinal materials 3 to be dried, making the final drying effect more sufficient and uniform. Wherein, the axis of the second air guiding channel refers to the central axis corresponding to its spiral line.

[0100] Optionally, referring to Figure 4 and Figure 5, a cleaning device (not shown in the figure) is provided in the drying chamber 102, and the water outlet end of the cleaning device is arranged towards the gap part of the mesh belt 2; the belt dryer further includes a collecting pipeline 11, the first end of the collecting pipeline 11 is connected to the condensate outlet of the first condenser 502 and the condensate outlet of the second condenser 602, and the second end of the collecting pipeline 11 is connected to the water inlet end of the cleaning device.

[0101] Impurities such as dirt and medicinal residues are likely to accumulate in the gap part of the mesh belt 2, which may cause the impurities in this part to be mixed into the medicinal materials 3 to be dried during the conveying process and affect the quality of the medicinal materials. Therefore, in this embodiment, a cleaning device is correspondingly arranged in the drying chamber 102 to clean the gap part of the mesh belt 2 and keep the mesh belt 2 clean; among them, the water outlet end of the cleaning device can be a water nozzle, a spraying structure, etc.

[0102] After the first condenser 502 and the second condenser 602 complete the condensation operation, condensate water will be generated. The condensate water is collected through the collecting pipeline 11 and supplied to the cleaning device for cleaning operation, which can realize the recycling of the condensate water and help save water resources; and because the condensate water is pure water with extremely low impurity content, it is not easy to leave scale on the mesh belt 2.

[0103] In addition, the condensate water generated after the first condenser 502 and the second condenser 602 complete the condensation operation can also be used for replenishing water to the steam system of the belt dryer, humidifying certain special medicinal materials, and water-cooling and cooling related components of the belt dryer, etc., which is not limited here.

[0104] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A belt dryer, characterized in that: include: The machine cover is provided with a first circulation chamber, a drying chamber and a second circulation chamber arranged from top to bottom, the front end of the drying chamber is provided with a material inlet, and the rear end of the drying chamber is provided with a material outlet; A mesh belt is arranged in the drying chamber, and is used to carry the medicinal materials to be dried; A conveying device, used for driving the mesh belt to move, so as to drive the medicinal material to be dried to be conveyed from the inlet to the outlet; A first circulation unit is arranged on the side of the mesh belt; the first circulation unit comprises a first exhaust device, a first condenser, a first heat exchanger and a first air supply device arranged from top to bottom; The first air supply device is used to push the gas in the second circulation chamber from bottom to top through the mesh belt and reach the first circulation chamber; The first exhaust device is used to draw the gas in the first circulation chamber to the first condenser for condensation; the first heat exchanger is used to heat the dry gas condensed by the first condenser and then transport it to the second circulation chamber; A second circulation unit is arranged at the side of the mesh belt; the second circulation unit comprises a second exhaust device, a second condenser, a second heat exchanger and a second air supply device arranged from bottom to top; the second air supply device is used to push the gas in the first circulation chamber from top to bottom through the mesh belt and reach the second circulation chamber; The second exhaust device is used to draw the gas in the second circulation chamber to the second condenser for condensation; the second heat exchanger is used to heat the dry gas condensed by the second condenser and then transport it to the first circulation chamber; The first circulation unit and the second circulation unit are arranged on both sides of the mesh belt or are staggered on one side of the mesh belt; the line connecting the inlet and the outlet on the horizontal projection plane constitutes a first path, and the first circulation unit and the second circulation unit are staggered along the first path.

2. The belt dryer according to claim 1, characterized in that: There is a height difference between the feed port and the discharge port, the mesh belt comprises at least two layers arranged at intervals in the height direction, the layer segment located at the top is connected to the feed port, and the layer segment located at the bottom is connected to the discharge port; the conveying device is used to drive the mesh belt to move, so as to drive the to-be-dried medicinal materials to pass through each of the layers in sequence from top to bottom, so that the to-be-dried medicinal materials complete at least two return movements between the front end of the drying chamber and the rear end of the drying chamber.

3. The belt dryer according to claim 1, characterized in that: The first circulation chamber is provided with a first humidity sensor, the first humidity sensor is electrically connected to the second circulation unit, and the first humidity sensor is used to detect the first environmental humidity of the first circulation chamber; The first humidity sensor is used to send an on signal to the second circulation unit when the first ambient humidity is higher than a first humidity threshold to trigger the second circulation unit to start running; and the first humidity sensor is used to send an off signal to the second circulation unit when the first ambient humidity is lower than a second humidity threshold to trigger the second circulation unit to stop running, and the second humidity threshold is less than the first humidity threshold.

4. The belt dryer according to claim 1, characterized in that: The belt dryer further comprises a dehumidification fan, which is mounted on the machine cover and communicates with the first circulation chamber and the second circulation chamber; The first circulation chamber is provided with a third humidity sensor, the third humidity sensor is electrically connected to the dehumidification fan, and the third humidity sensor is used to detect the third environmental humidity of the first circulation chamber; the third humidity sensor is used to send a first exhaust signal to the dehumidification fan when the third environmental humidity is higher than a third humidity threshold, so as to trigger the dehumidification fan to exhaust the gas in the first circulation chamber to the outside of the hood; And / or, the second circulation chamber is provided with a fourth humidity sensor, the fourth humidity sensor is electrically connected to the dehumidification fan, and the fourth humidity sensor is used to detect the fourth ambient humidity of the second circulation chamber; the fourth humidity sensor is used to send a second extraction signal to the dehumidification fan when the fourth ambient humidity is higher than a fourth humidity threshold, so as to trigger the dehumidification fan to extract the gas in the second circulation chamber to the outside of the hood.

5. The belt dryer according to claim 4, characterized in that: The belt dryer further comprises an air supply fan, which is mounted on the machine cover and communicates with the first circulation chamber and the second circulation chamber; The air supply fan is electrically connected to the third humidity sensor; when the air supply fan receives the first exhaust signal sent by the third humidity sensor, the air supply fan is used to supply external air into the first circulation chamber after a first preset time; And / or, the air supply fan is electrically connected to the fourth humidity sensor; when the air supply fan receives the second exhaust signal sent by the fourth humidity sensor, the air supply fan is used to supply external air into the second circulation chamber after a second preset time.

6. The belt dryer according to claim 1, characterized in that: A first air guide structure is provided in the drying chamber, wherein the first air guide structure has a spiral first air guide channel, wherein an air inlet end of the first air guide channel faces the first circulation chamber, and an air outlet end of the first air guide channel faces the upper side of the mesh belt; And / or, a second air guide structure is provided in the drying chamber, the second air guide structure has a spiral second air guide channel, the air inlet end of the second air guide channel faces the second circulation chamber, and the air outlet end of the second air guide channel faces the lower side of the mesh belt.

7. The belt dryer according to claim 6, characterized in that: The first air guide structure is provided with a first flow hole extending through the first air guide channel in a vertical direction, and the first flow hole is connected to the first air guide channel; And / or, the second air guiding structure is provided with a second flow hole penetrating along the vertical direction, and the second flow hole is communicated with the second air guiding channel.

8. The belt dryer according to claim 6, characterized in that: The belt dryer further includes a first drive motor, the first drive motor is connected to the first air guide structure, and the first drive motor is used to drive the first air guide structure to rotate around the axis of the first air guide channel; And / or, the belt dryer further includes a second drive motor, the second drive motor is connected to the second air guide structure, and the second drive motor is used to drive the second air guide structure to rotate around the axis of the second air guide channel.

9. The belt dryer according to any one of claims 1 to 8, characterized in that: A cleaning device is provided in the drying chamber, and a water outlet end of the cleaning device is arranged toward the gap portion of the mesh belt; the belt dryer also includes a collecting pipe, a first end of the collecting pipe is connected to the condensate outlet of the first condenser and the condensate outlet of the second condenser, and a second end of the collecting pipe is connected to the water inlet end of the cleaning device.

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