Belt dryer

Abstract

The invention discloses a belt dryer, which relates to the technical field of traditional Chinese medicinal material production, and comprises a hood, a mesh belt, a conveying device, a first circulating unit and a second circulating unit, a first circulating cavity, a drying cavity and a second circulating cavity are arranged in the machine cover from top to bottom, a feeding port is formed in the front end of the drying cavity, and a discharging port is formed in the rear end of the drying cavity. The mesh belt is arranged in the drying cavity and is used for bearing to-be-dried medicinal materials; the conveying device is used for driving the mesh belt to move so as to drive to-be-dried medicinal materials to be conveyed to the discharging opening from the feeding opening; the first circulating unit is arranged on the side part of the mesh belt and supplies high-temperature gas to the drying cavity from bottom to top; the second circulating unit is arranged on the side portion of the mesh belt and supplies high-temperature gas to the drying cavity from top to bottom. According to the scheme, high-temperature airflow can make direct contact with the to-be-dried medicinal materials in multiple directions, the contact area between the high-temperature airflow and the to-be-dried medicinal materials is increased, heat exchange is more sufficient, and therefore the drying uniformity and the drying efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of Chinese medicinal material production, in particular to a belt drying machine. Background Art

[0002] The production of Chinese medicinal materials generally includes processes such as selection, washing, moistening, cutting, drying, and packaging. The drying process is used to remove moisture contained in the Chinese medicinal materials to prevent them from becoming moldy or rotten due to excessive moisture. It also helps to maintain the color, aroma and active ingredients of the Chinese medicinal materials and avoid the loss or denaturation of active ingredients due to moisture.

[0003] The drying process of Chinese herbal medicines is usually carried out using a belt dryer, which uses hot air to dry the Chinese herbal medicines laid on a mesh belt. The belt dryer has the advantages of high drying efficiency and suitability for batch continuous production. However, after being dried by the existing belt dryer, some Chinese herbal medicines still have the problem of incomplete drying in some parts, which has a negative impact on the quality of the finished Chinese herbal medicines. Summary of the invention

[0004] The main purpose of the present invention is to provide a belt dryer, aiming to improve the drying uniformity of the belt dryer and avoid the problem of incomplete drying of local positions of Chinese medicinal materials.

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

[0006] 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;

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

[0008] 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;

[0009] The first circulation unit is arranged at 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;

[0010] The second circulation unit is arranged on the side of the mesh belt; the second circulation unit includes 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.

[0011] In one embodiment, there is a height difference between the feed port and the discharge port, and the mesh belt includes at least two segments spaced apart in the height direction, the segment located at the top is connected to the feed port, and the 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 medicinal materials to be dried to pass through each of the segments from top to bottom in sequence, so that the medicinal materials to be dried complete at least two return movements between the front end of the drying chamber and the rear end of the drying chamber.

[0012] In one embodiment, a line connecting the material inlet and the material outlet on a horizontal projection plane forms a first path, and the first circulation units and the second circulation units are arranged alternately along the first path.

[0013] In one embodiment, 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;

[0014] 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.

[0015] In one embodiment, 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;

[0016] 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;

[0017] 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.

[0018] In one embodiment, the belt dryer further comprises an air supply fan, the air supply fan is mounted on the machine cover, and the air supply fan is connected to the first circulation chamber and the second circulation chamber;

[0019] 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;

[0020] 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 replenish external air into the second circulation chamber after a second preset time.

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

[0022] 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.

[0023] In one embodiment, 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;

[0024] 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.

[0025] In one embodiment, the belt dryer further comprises 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;

[0026] 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.

[0027] In one embodiment, 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.

[0028] In the technical solution of the present invention, by setting the first circulation unit and the second circulation unit, hot air can be transported to the mesh belt from bottom to top and from top to bottom, without being limited to the traditional single form of upward air supply, and the intersection between the part of the upward airflow supplied to the drying chamber by the first circulation unit and the part of the downward airflow supplied to the drying chamber by the second circulation unit can disperse the airflow and flow in multiple directions, thereby increasing the direct contact area between the high-temperature airflow and the medicinal materials to be dried, making the heat exchange between the high-temperature airflow and the medicinal materials to be dried more complete, thereby improving the drying uniformity and drying efficiency, and allowing the medicinal materials to obtain a better drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

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

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

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

[0033] Figure 4 A schematic diagram of the operation of the first circulation unit in an embodiment of the belt dryer provided by the present invention;

[0034] Figure 5 A schematic diagram of the operation of the second circulation unit in an embodiment of the belt dryer provided by the present invention;

[0035] Figure 6 This is a perspective structural schematic diagram of the first air guide structure in an embodiment of the belt dryer provided by the present invention.

[0036] Description of Figure Numbers:

[0037] 1. Machine cover; 101. First circulation chamber; 102. Drying chamber; 103. Second circulation chamber; 104. Inlet; 105. Outlet;

[0038] 2. Mesh belt;

[0039] 3. Medicinal materials to be dried;

[0040] 4. Conveying device;

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

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

[0043] 7. Dehumidification fan;

[0044] 8. Air supply fan;

[0045] 9. First air guide structure; 901. First air guide channel; 902. First flow hole;

[0046] 10. Second air guide structure;

[0047] 11. Collecting pipe.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The production of Chinese medicinal materials generally includes processes such as selection, washing, moistening, cutting, drying, and packaging. The drying process is used to remove the moisture contained in the Chinese medicinal materials to prevent the Chinese medicinal materials from becoming moldy or rotting due to excessive moisture. At the same time, it helps to maintain the color, aroma and effective ingredients of the Chinese medicinal materials and avoid the loss or denaturation of effective ingredients due to moisture. The drying process of Chinese medicinal materials is usually carried out using a belt dryer. The belt dryer uses hot air to dry the Chinese medicinal materials laid on a mesh belt. It has the advantages of high drying efficiency and suitability for batch continuous production. However, after some Chinese medicinal materials are dried by existing belt dryers, there is still the problem of incomplete drying in some parts, which has an adverse effect on the quality of the finished Chinese medicinal materials.

[0053] The researchers of this application have found that the existing belt dryers convey hot air to the mesh belt in a relatively single direction. The most common method is to convey hot air to the mesh belt from bottom to top, so that the high-temperature airflow passes through the holes of the mesh belt upward to dry the Chinese medicinal materials carried on the mesh belt. At the same time, the rising airflow can be used to blow up the Chinese medicinal materials on the mesh belt under a certain air pressure, so that the Chinese medicinal materials can be turned over, so that the rising airflow can contact different surfaces of the Chinese medicinal materials to obtain a higher drying uniformity. However, for heavier Chinese medicinal materials, or when the thickness of the accumulation of Chinese medicinal materials on the mesh belt is thick, the rising airflow may be difficult to effectively drive the Chinese medicinal materials to turn over, thus limiting the direct contact area between the rising airflow and the Chinese medicinal materials, which ultimately leads to the problem of incomplete drying.

[0054] In order to solve the above problems, the present invention provides a belt dryer, which is designed to transport hot air to the mesh belt from multiple directions to increase the direct contact area between the airflow and the Chinese medicinal materials, so that the airflow can take away the moisture contained in the Chinese medicinal materials from multiple directions, making the final drying effect of the Chinese medicinal materials more sufficient.

[0055] See also Figures 1 to 5The belt dryer provided by the present invention comprises:

[0056] The housing 1 is 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 is provided with a material inlet 104, and the rear end of the drying chamber 102 is provided with a material outlet 105;

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

[0058] The conveying device 4 is used to drive the mesh belt 2 to move, so as to drive the to-be-dried medicinal material 3 to be conveyed from the inlet 104 to the outlet 105;

[0059] The first circulation unit 5 is arranged at the side of the mesh belt 2; the first circulation unit 5 includes a first exhaust 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 from bottom to top through the mesh belt 2 and reach the first circulation chamber 101; the first exhaust 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 condensed by the first condenser 502 and then transport it to the second circulation chamber 103;

[0060] The second circulation unit 6 is arranged on the side of the mesh belt 2; the second circulation unit 6 includes a second exhaust 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 from top to bottom through the mesh belt 2 and reach the second circulation chamber 103; the second exhaust 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 condensed by 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 one end of the belt dryer used to connect to the previous level process equipment (for example, a system for cutting Chinese medicinal materials), and the rear end of the drying chamber 102 refers to one end of the belt dryer used to connect to the next level process equipment (for example, a system for packaging Chinese medicinal materials); after the medicinal materials 3 to be dried output by the previous level process equipment enter the belt dryer through the feed port 104, the medicinal materials 3 to be dried will complete the drying operation in the belt dryer and finally be output to the next level process equipment through the discharge port 105.

[0062] The laying path of the mesh belt 2 in the drying chamber 102 constitutes a conveying line for the medicinal material 3 to be dried, and the conveying line can be flexibly set according to the layout in the machine cover 1 and the actual drying requirements, and is not limited to being connected in a straight line from the feed port 104 to the discharge port 105. The conveying device 4 may include a motor and a matching transmission mechanism, and the conveying device 4 may drive the mesh belt 2 to move continuously to convey the medicinal material 3 to be dried from the feed port 104 to the discharge 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 arranged on both sides of the mesh belt 2 or staggered on one side of the mesh belt 2; during the process of the dried medicinal material 3 being transported in the drying chamber 102, the first circulation unit 5 and the second circulation unit 6 can perform drying operations on the dried medicinal material 3 respectively. Figure 4 As 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 high-temperature gas formed by the heating into the second circulation chamber 103; the first air supply device 504 can be a fan, which can transport the high-temperature gas of the second circulation chamber 103 to the drying chamber 102 above. In the process of the high-temperature gas passing through the mesh belt 2 from bottom to top, the heat exchange can be carried out with the to-be-dried medicinal material 3 on the mesh belt 2, and then the gas can carry the moisture generated by the evaporation of the to-be-dried medicinal material 3 and enter the first circulation chamber 101 above the drying chamber 102 in the form of water vapor, thereby completing The first exhaust device 501 can be a fan, which can draw the water vapor in the first circulation chamber 101 to the first condenser 502; the first condenser 502 can condense the water in the water vapor into liquid water through the cooling medium, and the liquid condensed water can be discharged to the outside or used after recovery, and the dry gas obtained after the condensation operation enters the first heat exchanger 503 below, and the first heat exchanger 503 can heat the part of the dry gas and continue to supply it to the second circulation chamber 103, so as 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 cycle. Similarly, if Figure 5As shown, for the second circulation unit 6, the second heat exchanger 603 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 high-temperature gas formed by the heating into the first circulation chamber 101; the second air supply device 604 can be a fan, which can transport the high-temperature gas of the first circulation chamber 101 to the drying chamber 102 below. In the process of the high-temperature gas passing through the mesh belt 2 from top to bottom, the heat exchange can be carried out with the to-be-dried medicinal material 3 on the mesh belt 2, and then the gas can carry the moisture generated by the evaporation of the to-be-dried medicinal material 3 and enter the second circulation chamber 103 below the drying chamber 102 in the form of water vapor, thereby completing The first drying operation for the medicinal material 3 to be dried is performed; the second exhaust device 601 can use a fan to draw 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, and the liquid condensed water can be discharged to the outside or used after recovery, and the dry gas obtained after the condensation operation enters the second heat exchanger 603 above, and the second heat exchanger 603 can heat the part of the dry gas and continue to supply it to the first circulation chamber 101, so as to repeat the above drying process, continue to dry the medicinal material 3 to be dried in the drying chamber 102, and form an internal circulation.

[0064] In addition, when the first circulation unit 5 and the second circulation unit 6 are working simultaneously, part of the upward airflow supplied to the drying chamber 102 by the first circulation unit 5 and part of the downward airflow supplied to the drying chamber 102 by the second circulation unit 6 will intersect, so that the airflow is dispersed and flows in multiple directions, and is not limited to a single vertical upward or vertical downward flow direction. Therefore, the airflow can directly contact the to-be-dried medicinal material 3 from multiple angles, so that the drying effect is more sufficient and the drying efficiency is higher.

[0065] The specific working principles of the first circulation unit 5 and the second circulation unit 6 can be referred to the existing air conditioning system, and the circulation process can also be completed with the assistance of a booster (compressor) and a depressurizer (expansion valve), and is not limited to a heat exchanger and a condenser, which will not be described in detail here. Preferably, the first air supply device 504 and the second air supply device 604 can be equipped with corresponding air flow distributors to distribute the high-temperature gas to various areas 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 transported to the mesh belt 2 from bottom to top and from top to bottom, and is not limited to the traditional single form of upward air supply. The intersection of the part of the upward airflow supplied to the drying chamber 102 by the first circulation unit 5 and the part of the downward airflow supplied to the drying chamber 102 by the second circulation unit 6 can disperse the airflow and flow in multiple directions, thereby increasing the direct contact area between the high-temperature airflow and the medicinal materials 3 to be dried, making the heat exchange between the high-temperature airflow and the medicinal materials 3 to be dried more complete, thereby improving the drying uniformity and drying efficiency, and achieving a better drying effect for the medicinal materials.

[0067] Optionally, refer to Figures 1 to 5 There is a height difference between the feed port 104 and the discharge port 105. The mesh belt 2 includes at least two layers (not shown in the figure) spaced apart in the height direction. The uppermost layer is connected to the feed port 104, and the lowermost layer is connected to the discharge port 105. The conveying device 4 is used to drive the mesh belt 2 to move, so as to drive the to-be-dried medicinal material 3 to pass through each layer from top to bottom in sequence, so that the to-be-dried medicinal material 3 completes at least two return movements between the front end of the drying chamber 102 and the rear end of the drying chamber 102.

[0068] In one embodiment, the mesh belt 2 can be a continuous structure, one end of the mesh belt 2 is connected to the feed port 104, and the other end of the mesh belt 2 is connected to the discharge port 105. The middle part of the mesh belt 2 forms a multi-layer serpentine structure through multiple turns between the front end of the drying chamber 102 and the rear end of the drying chamber 102. At this time, the corresponding part of the mesh belt 2 in each layer constitutes a layer segment; each turning position of the mesh belt 2 can be wound around a transmission wheel, and one of the transmission wheels is driven to rotate in a fixed direction by the conveying device 4, so that the to-be-dried medicinal material 3 on the mesh belt 2 can be driven from the feed port 104 through multiple turns and finally reach the discharge port 105.

[0069] In another embodiment, the mesh belt 2 can also be divided into multiple discontinuous parts, each of which constitutes a layer segment, and the conveying device 4 can drive each group of two adjacent layers to move in opposite directions through a corresponding transmission mechanism; based on this setting, when the medicinal materials 3 to be dried on a layer segment are conveyed from the front end to the rear end, this part of the medicinal materials 3 to be dried can fall on the next layer segment, and then be conveyed from the rear end to the front end, and so on. The reciprocating return can also achieve the goal of driving the medicinal materials 3 to be dried from the feed port 104 to the discharge port 105 after multiple turns.

[0070] Based on the above arrangement, the height space in 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 can be evaporated more thoroughly, thereby obtaining a better drying effect.

[0071] Optionally, refer to Figures 1 to 5 The line connecting the material inlet 104 and the material outlet 105 on the horizontal projection plane constitutes a first path, and the first circulation units 5 and the second circulation units 6 are arranged alternately along the first path.

[0072] As an example, the drying chamber 102 is divided into four areas along the first path and arranged in sequence. If the first circulation unit 5 is set in the first area, the second circulation unit 6 must be set in the second area, the first circulation unit 5 must be set in the third area, and the second circulation unit 6 must be set in the fourth area; similarly, if the second circulation unit 6 is set in the first area, the first circulation unit 5 must be set in the second area, the second circulation unit 6 must be set in the third area, and the first circulation unit 5 must be set in the fourth area; wherein, 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-mentioned staggered arrangement, the situation in which 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 and the second circulation unit 6 are directly opposite to each other can be avoided. While ensuring that part of the high-temperature airflow of the first circulation unit 5 and part of the high-temperature airflow of the second circulation unit 6 have a certain degree of intersection in the drying chamber 102 to increase the gas flow direction and improve the drying effect, 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 can be avoided to the greatest extent, and the water vapor of the first circulation unit 5 and the high-temperature drying gas of the second circulation unit 6 can be avoided to the greatest extent. Interference with each other in the first circulation chamber 101, thereby minimizing the negative impact between the drying operation of the first circulation unit 5 and the drying operation of the second circulation unit 6.

[0074] Optionally, refer 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 environmental humidity of the first circulation chamber 101;

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

[0076] In actual applications, the airflow circulation direction of the first circulation unit 5 conforms to the flow characteristics of the gas at different temperatures (high-temperature gas rises, low-temperature gas falls), so the first exhaust device 501, the first air supply device 504 and other devices used to drive the gas flow in the first circulation unit 5 can achieve the above-mentioned airflow circulation with less energy consumption, and the rising airflow in the drying chamber 102 helps to drive the to-be-dried medicinal materials 3 laid on the mesh belt 2 to turn over, so that the to-be-dried medicinal materials 3 can achieve more sufficient contact with the high-temperature airflow. However, the airflow circulation direction of the second circulation unit 6 does not conform to the flow characteristics of the gas at different temperatures (high-temperature gas rises, low-temperature gas falls), so the second exhaust device 601, the second air supply device 604 and other devices used to drive the gas flow in the second circulation unit 6 need to consume more energy to overcome the flow characteristics of the gas itself and achieve the above-mentioned airflow circulation, and the descending airflow in the drying chamber 102 is difficult to drive the to-be-dried medicinal materials 3 laid on the mesh belt 2 to turn over.

[0077] It can be seen that the first circulation unit 5 can achieve a better drying effect with less energy consumption, that is, the cost-effectiveness 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, the present embodiment preferentially utilizes the first circulation unit 5 for drying operation, while the second circulation unit 6 is in a non-working state; and when the first humidity sensor detects that the first ambient humidity of the first circulation chamber 101 is higher than the first humidity threshold, it indicates that the batch of medicinal materials 3 to be dried contains more moisture, and the expected drying effect may not be obtained by relying solely on the first circulation unit 5, and the second circulation unit 6 is triggered to run by sending an opening signal (specifically, the first exhaust device 501, the first condenser 502, the first heat exchanger 503, and the first air supply device 504 are triggered to run) to assist the first circulation unit 5 in performing the drying operation together; after the second circulation unit 6 has been running for a period of time, if the first humidity sensor detects that the first ambient humidity of the first circulation chamber 101 is lower than the second humidity threshold, it indicates 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, and the second circulation unit 6 is triggered to stop running by sending a closing signal (specifically, the second exhaust device 601, the second condenser 602, the second heat exchanger 603, and the second air supply device 604 are triggered to run).

[0078] Based on the above arrangement, 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 actual drying requirements, thereby achieving a better drying effect with relatively low energy consumption.

[0079] Optionally, refer to Figures 1 to 5 The belt dryer further comprises a dehumidification fan 7, which is mounted on the hood 1 and communicates 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 dehumidification fan 7, and the third humidity sensor is used to detect the third environmental humidity of the first circulation chamber 101; the third humidity sensor is used to send a first exhaust signal to the dehumidification fan 7 when the third environmental humidity is higher than the third humidity threshold, so as to trigger the dehumidification fan 7 to exhaust the gas in the first circulation chamber 101 to the outside of the hood 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 dehumidification 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 dehumidification fan 7 when the fourth ambient humidity is higher than the fourth humidity threshold, so as to trigger the dehumidification fan 7 to exhaust the gas in the second circulation chamber 103 to the outside of the hood 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 (that is, higher than the preset dehumidification critical value) at this time, and the dehumidification fan 7 can be triggered by sending a first exhaust signal to discharge the gas with excessive humidity in the first circulation chamber 101 to the outside of the hood 1, so as to avoid that the gas with excessive humidity enters the internal circulation process of the first circulation unit 5 and causes 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 (that is, higher than the preset dehumidification critical value) at this time, and the dehumidification fan 7 can be triggered by sending a second exhaust signal to discharge the gas with excessive humidity in the second circulation chamber 103 to the outside of the hood 1, so as to avoid that the gas with excessive humidity enters the internal circulation process of the second circulation unit 6 and causes a great burden on the second condenser 602.

[0083] Among them, an air regulating plate can be arranged in the dehumidification fan 7, and the air regulating plate can effectively control the dehumidification amount, so that the dehumidification fan 7 can accurately dehumidify to the preset dehumidification bottom limit after starting.

[0084] Optionally, refer to Figures 1 to 5 The belt dryer further comprises an air supply fan 8, which is mounted on the hood 1 and communicates with the first circulation chamber 101 and the second circulation chamber 103;

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

[0086] And / or, the air supply fan 8 is electrically connected to the fourth humidity sensor; when the air supply fan 8 receives the second exhaust signal sent by the fourth humidity sensor, the air supply fan 8 is used to supply external air 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, when the gas with excessively high humidity is discharged from the outside of the hood 1, the amount of gas in the hood 1 that can be used for internal circulation will be reduced; in this regard, the present embodiment is correspondingly provided with an air supply fan 8 to automatically supply external air into the hood 1 through the air supply fan 8 after dehumidification is completed, so as to ensure the total amount of gas used for internal circulation. Among them, when the third humidity sensor sends a first exhaust signal to the dehumidification fan 7, the air supply fan 8 can receive the first exhaust signal at the same time. At this time, the air supply fan 8 can perform the air supply operation after the first preset time based on the preset program; similarly, when the fourth humidity sensor sends a second exhaust signal to the dehumidification fan 7, the air supply fan 8 can receive the second exhaust signal at the same time. At this time, the air supply fan 8 can perform the air supply operation after the second preset time based on the preset program; the above operation can ensure that the gas with excessive humidity discharged by the dehumidification fan 7 is fully diluted in the external air, and then the air supply operation is performed, so as to avoid the air supply fan 8 directly replenishing the external gas with excessive humidity into the hood 1 for internal circulation.

[0088] Preferably, the air supply fan 8 and the moisture removal fan 7 are arranged at a preset distance to avoid the air supply fan 8 directly replenishing the gas with excessive humidity discharged by the moisture removal fan 7 into the hood 1 again to the greatest extent.

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

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

[0091] By setting the first air guide structure 9, the high-temperature airflow transported upward by the first air supply device 504 can be supplied to the drying chamber 102 in a spiral upward flow direction after passing through the first air guide channel 901, so that the flow direction of the gas is not limited to a single vertical upward direction; similarly, by setting the second air guide structure 10, the high-temperature airflow transported downward by the second air supply device 604 can be supplied to the drying chamber 102 in a spiral downward flow direction after passing through the second air guide 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 be directly contacted with the medicinal material 3 to be dried from more different angles, which can further increase the contact area between the gas and the medicinal material 3 to be dried, thereby further improving the final drying effect.

[0092] Optionally, refer to Figure 4 and Figure 6 The first air guiding structure 9 is provided with a first flow hole 902 which is arranged to penetrate in the vertical direction, and the first flow hole 902 is connected to the first air guiding channel 901 .

[0093] Optionally, refer to Figure 5 The second air guide structure 10 is provided with a second flow hole (not shown in the figure) penetrating in the vertical direction, and the second flow hole is connected to the second air guide channel.

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

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

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

[0097] Optionally, refer to Figure 5 The belt dryer also includes a second drive motor (not shown in the figure), which is connected to the second air guide structure 10 and is used to drive the second air guide structure 10 to rotate around the axis of the second air guide channel.

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

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

[0100] Optionally, refer to Figure 4 and Figure 5A 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 toward the gap portion of the mesh belt 2; the belt dryer also includes a collecting pipe 11, a first end of the collecting pipe 11 is connected to the condensate outlet of the first condenser 502 and the condensate outlet of the second condenser 602, and a second end of the collecting pipe 11 is connected to the water inlet end of the cleaning device.

[0101] The gaps in the mesh belt 2 are prone to accumulate impurities such as dirt and medicinal residues, which may cause the dried medicinal materials 3 to be mixed with these impurities during the transportation 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 gaps in the mesh belt 2 and keep the mesh belt 2 clean; wherein the water outlet end of the cleaning device can be a water nozzle, a spray structure, etc.

[0102] The first condenser 502 and the second condenser 602 will produce condensed water after completing the condensation operation. This part of the condensed water is collected through the collecting pipe 11 and supplied to the cleaning device for cleaning operation, so as to realize the recycling and reuse of the condensed water and help save water resources; and because the condensed 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 condensed water generated by the first condenser 502 and the second condenser 602 after completing the condensation operation can also be used to replenish the steam system of the belt dryer, humidify certain special medicinal materials, and perform water cooling on related components of the belt dryer, etc., which are 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. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are 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.

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: A line connecting the material inlet and the material outlet on a horizontal projection plane forms a first path, and the first circulation units and the second circulation units are arranged alternately along the first path.

4. 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.

5. 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.

6. The belt dryer according to claim 5, 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 replenish external air into the second circulation chamber after a second preset time.

7. 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.

8. The belt dryer according to claim 7, 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.

9. The belt dryer according to claim 7, 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.

10. The belt dryer according to any one of claims 1 to 9, 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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