Convection cross-flow constant-humidity under-forest ginseng drying machine

Abstract

The convection cross-flow constant-humidity under-forest ginseng drying machine comprises a drying box, the top of the drying box is provided with a circulating drying device and a moisture discharging device, and the bottom of the drying box is provided with a steam drying device; a bottom through plate with uniform air holes is arranged in the drying box, the drying box is divided into a drying chamber and a steam chamber by the bottom through plate, and a movable drying trolley assembly is arranged in the drying chamber; the steam drying device comprises a steam generating box embedded in the bottom of the drying box, and a drainage device is arranged between the steam generating box and the bottom through plate. The invention belongs to the technical field of dryers, and particularly relates to a convection and cross-flow constant-humidity under-forest ginseng dryer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drying machines, in particular to a convection through-flow constant humidity under-forest ginseng drying machine. BACKGROUND

[0002] As a precious medicinal plant, the drying process of under-forest ginseng has a great impact on quality. It is necessary to retain effective ingredients while ensuring uniform dehydration and avoiding component loss, morphological deformation and local mold due to improper drying. At present, the existing under-forest ginseng drying technology mainly has the following problems: 1. Single drying method, poor uniformity: the existing drying equipment mainly relies on single hot air drying or static airing. Among them, when single hot air drying, the hot air distribution is uneven, which easily leads to local over-heating of under-forest ginseng, rapid water loss, and difficulty in internal diffusion, forming the phenomenon of "outer dry and inner wet", affecting the drying quality; static airing completely depends on the natural environment, and the fluctuation of temperature and humidity significantly affects the drying effect, the drying period is long and local mold is easy to appear, which is difficult to meet the efficiency and stability requirements of modern large-scale production.

[0003] 2. Improper initial water treatment, affecting system stability: fresh under-forest ginseng often has a large amount of free water on the surface, and the existing equipment does not have a targeted pretreatment device. These water will quickly evaporate in the initial drying stage, causing the humidity in the drying chamber to rise sharply, disturbing the temperature and humidity balance, increasing the system control load, and even causing local rot of under-forest ginseng due to local water accumulation, reducing the pass rate of finished products.

[0004] 3. Fixed placement of materials, insufficient contact: the material placing rack of the existing drying equipment is mainly of fixed structure, and the placement angle of under-forest ginseng cannot be adjusted, which leads to insufficient contact of some areas with the drying medium (hot air, steam, etc.), especially for irregularly shaped under-forest ginseng, which is prone to local incomplete drying, and needs secondary drying, increasing production cost. SUMMARY

[0005] In order to solve the problems of poor drying uniformity, lack of initial water regulation and insufficient drying contact of the existing drying equipment, the present application provides a convection through-flow constant humidity under-forest ginseng drying machine.

[0006] In order to realize the above functions, the technical scheme adopted by the present application is as follows: a convection through-flow constant humidity under-forest ginseng drying machine, comprising a drying box, the bottom of the drying box is uniformly provided with support columns; a controller is installed on the drying box, and a plurality of temperature sensors and humidity sensors are uniformly arranged in the drying box; A circulating drying device and a moisture removal device are arranged on the top of the drying box, and a steam drying device is arranged at the bottom of the drying box. The bottom through plate with uniform air holes is arranged in the drying box, which divides the drying box into a drying chamber and a steam chamber, and a movable drying trolley assembly is arranged in the drying chamber. The steam drying device comprises a steam generating box embedded in the bottom of the drying box, which is located inside the support column, and a drainage device is arranged between the steam generating box and the bottom through plate.

[0007] Further, the circulating drying device comprises a circulating fan fixedly arranged on the top of the drying box and an electric heating tube box fixedly arranged in the drying chamber, the circulating fan is symmetrically arranged at two diagonal positions on the top of the drying box, the air outlet pipe of the circulating fan is connected with the electric heating tube box below, and the bottom of the electric heating tube box is provided with an air outlet.

[0008] Further, the steam drying device further comprises a steam heater located in the steam generating box and a blower located on one side of the steam generating box, the air outlet pipe of the blower penetrates through the steam generating box and is connected with the air inlet of the steam heater, the top of the steam generating box is uniformly provided with through holes, and the air outlet of the steam heater is connected with the drying chamber through the through holes.

[0009] Further, the drying box is provided with a microwave generator on the side, the waveguide pipe of the microwave generator penetrates through the side of the drying box and is connected with the drying chamber.

[0010] Further, the drainage device comprises a drainage fan fixedly arranged on the top of the drying box, the air inlet of the drainage fan penetrates through the top of the drying box, and the top of the drying box is provided with an air inlet pipe connected with the drying chamber.

[0011] Further, the left and right sides of the drying box are respectively provided with pull-out grooves, the drainage device comprises a left sliding plate movably arranged in the left pull-out groove and a right sliding plate movably arranged in the right pull-out groove, the opposite end faces of the left sliding plate and the right sliding plate are connected through clamping, and the left sliding plate and the right sliding plate form an inclined plate body after being clamped. The drying box is provided with a drainage pipe with a valve on the top, and the drainage pipe is located above the right pull-out groove.

[0012] Further, the drainage device further comprises a support block fixedly arranged on the rear side of the drying box, air cylinders fixedly arranged on the two sides of the support block, a sliding rod parallel to the inclined plate body, and a connecting block sleeved on the sliding rod, two groups of the air cylinders are arranged on the two sides of the support block in opposite directions and are parallel to the inclined plate body, the piston rod of the air cylinder located at the bottom is fixedly connected with the right sliding plate, the piston rod of the air cylinder located at the top is fixedly connected with the left sliding plate, the connecting block is arranged in two groups and is fixedly arranged on the top of the opposite end faces of the left sliding plate and the right sliding plate, and the two ends of the sliding rod are fixedly arranged on the inner side walls of the drying box.

[0013] Further, the drying box is hinged with an observation door, and a material trolley is arranged outside the drying box. The drying trolley assembly is composed of a bottom plate with a slot at the bottom, moving wheels evenly arranged at the bottom of the bottom plate, an inverted U-shaped frame fixed at the top of the bottom plate, an angle adjusting mechanism on the inverted U-shaped frame, a placing frame evenly arranged on the inverted U-shaped frame, and a storage plate inserted and matched to the top of the placing frame. The bottom of the storage plate is connected by a plurality of groups of horizontal strip plates and vertical strip plates in a staggered manner to form evenly distributed screen holes.

[0014] Further, the outer side walls of the inverted U-shaped frame are provided with connecting blocks up and down. The angle adjusting mechanism comprises a driving motor fixed on the connecting blocks, a rotating shaft arranged between the two groups of connecting blocks, a connecting rod rotatably penetrating through the two side ends of the inverted U-shaped frame, a worm wheel fixed at the end of the connecting rod, and a worm gear arranged on the rotating shaft and matched with the worm wheel. Further, the placing frame is in the shape of a U, and the two ends thereof are fixedly sleeved on the two ends of the connecting rod, the output shaft of the driving motor penetrates through the connecting block and is connected with the end of the rotating shaft, and the worm wheel and the worm gear are meshingly arranged.

[0015] Compared with the prior art, the above-mentioned structure of the present application has the following beneficial effects: 1. Through the cooperation of the circulating drying device, the steam drying device and the microwave generator, a constant humidity drying environment with convection through flow can be formed, the hot air provided by the circulating drying device, the humid hot air flow provided by the steam drying device and the internal heating of the microwave generator are combined, which not only avoids the problem of uneven local drying or excessive water loss of the forest-grown ginseng caused by single drying method, but also accelerates the water evaporation of the forest-grown ginseng from inside to outside in all directions, significantly improves the drying efficiency and drying quality, and ensures that the effective components of the forest-grown ginseng are preserved.

[0016] 2. Through the arrangement of the drainage device, the drainage device can collect and discharge the free water initially dropped by the forest-grown ginseng in time, avoid the accumulation of water in the drying chamber to form local water accumulation, and ensure the uniform distribution of the drying medium in the drying chamber; at the same time, through the drying pretreatment of the forest-grown ginseng, the initial moisture content is effectively reduced, the subsequent drying load of the drying machine is reduced, the drying system can enter the stable constant humidity drying state faster, and the overall drying efficiency is significantly improved.

[0017] 3. Through the arrangement of the angle adjusting mechanism, the inclination angle of the placing frame can be flexibly adjusted, and the placing posture of the forest-grown ginseng is adjusted, the contact area and frequency of the forest-grown ginseng and the drying medium are increased, the individual morphological differences of the forest-grown ginseng and the morphological changes in the drying process are adapted, the problem of insufficient local drying of the forest-grown ginseng caused by fixed placing angle in the prior art is solved, the drying uniformity is further ensured, and the drying effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1The overall structure diagram of the convection through-flow constant humidity under-forest ginseng drying machine Figure 1 Figure 2 The overall structure diagram of the convection through-flow constant humidity under-forest ginseng drying machine Figure 2 Figure 3 The overall structure diagram of the convection through-flow constant humidity under-forest ginseng drying machine Figure 3 Figure 4 The overall structure diagram of the drying box and the material trolley Figure 5 The overall structure diagram of the drying trolley assembly Figure 6 The partial enlarged view of A in Figure 5 Figure 7 The cross-sectional view of the convection through-flow constant humidity under-forest ginseng drying machine Figure 8 The partial enlarged view of B in Figure 7

[0019] 1, drying box, 2, circulating drying device, 21, circulating fan, 22, electric heating tube box, 3, moisture removal device, 31, moisture removal fan, 32, air inlet pipe, 4, steam drying device, 41, steam generation box, 42, steam heater, 43, air blower, 5, bottom through plate, 6, drying chamber, 7, steam chamber, 8, drying trolley assembly, 81, bottom plate, 82, moving wheel, 83, inverted U-shaped frame, 84, angle adjusting mechanism, 841, driving motor, 842, rotating rod, 843, connecting rod, 844, worm gear, 845, worm, 846, connecting block, 85, placing frame, 86, placing plate, 9, drainage device, 91, left sliding plate, 92, right sliding plate, 93, air cylinder, 94, supporting block, 95, connecting block, 96, sliding rod, 97, drain pipe, 10, microwave generator, 11, observation door, 12, material trolley, 13, supporting column, 14, controller, 141, temperature sensor, 142, humidity sensor. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] ​​​​​In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] Unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances. The present application will be further described in detail below in conjunction with the drawings.

[0023] As shown in Figures 1-8 The present application provides a kind of convection through flow constant humidity under forest ginseng drying machine, including drying box 1, drying box 1 top is provided with circulating drying device 2 and exhaust device 3, bottom is provided with steam drying device 4, provides hot air circulation heating by the circulating drying device 2 of top, the wet heat environment of steam drying device 4 in bottom provides, cooperate with exhaust device 3 to adjust humidity, form the drying environment of convection through flow, realize the constant humidity drying of under forest ginseng; Drying box 1 is provided with the bottom pass plate 5 of even air hole, bottom pass plate 5 separates drying box 1 into drying chamber 6 and steam chamber 7, the bottom pass plate 5 of air hole can separate two chambers, and the steam of steam chamber 7 can enter drying chamber 6 through air hole, drying chamber 6 is provided with movable drying car assembly 8, drying car assembly 8 facilitates the batch of under forest ginseng to be put in and taken out, improves the operational convenience; Steam drying device 4 includes steam generation box 41 embedded in the bottom of drying box 1, drainage device 9 is arranged between steam generation box 41 and bottom pass plate 5, for collecting and discharging the large water droplets attached on the surface of initial under forest ginseng, if not handled in time, drainage device 9 can pre-treat under forest ginseng by quickly collecting and discharging the free moisture attached on the surface of under forest ginseng, reduce its initial moisture content, avoid excess moisture to interfere with the temperature and humidity balance in drying chamber 6;Meanwhile, pre-treatment can reduce the subsequent drying load of drying machine, so that the drying system can enter the stable constant humidity drying state more quickly, improve the overall drying efficiency, and lay a foundation for uniform and efficient drying of under forest ginseng.

[0024] As shown in Figures 1-4As shown in Figure 7, the circulating drying device 2 includes a circulating fan 21 fixedly installed on the top of the drying chamber 1 and an electric heating tube box 22 fixedly installed in the drying chamber 6. The circulating fan 21 is symmetrically arranged at two opposite corners of the top of the drying chamber 1, and its air outlet is connected to the electric heating tube box 22 below. The bottom of the electric heating tube box 22 has an air outlet. The circulating fan 21 drives the air to flow. After the air is heated by the electric heating tube box 22, it is blown into the drying chamber 6 from the air outlet. The symmetrically arranged circulating fan 21 can form a convective airflow, making the temperature distribution in the drying chamber 6 more uniform and improving the drying efficiency and effect.

[0025] like Figures 1-4 As shown in Figure 7, the steam drying device 4 also includes a steam heater 42 located inside the steam generating box 41 and a blower 43 located on one side of the steam generating box 41. The air outlet pipe of the blower 43 passes through the steam generating box 41 and is connected to the air inlet of the steam heater 42. The top of the steam generating box 41 is uniformly provided with through holes. The air outlet of the steam heater 42 is connected to the drying chamber 6 through the through holes to discharge the steam generated by the steam generator into the drying chamber 6. The steam generated by the steam heater 42, driven by the blower 43, enters the drying chamber 6 through the through holes with the airflow, forming a humid and hot environment. At the same time, the humid and hot airflow and the hot air blown out by the circulating fan 21 in the circulating drying device 2 form a convection flow, which not only avoids the excessive local moisture loss of the forest ginseng caused by single hot air drying, but also accelerates the evaporation of moisture on the surface of the forest ginseng through the interaction of airflows, significantly improving the drying uniformity and efficiency.

[0026] like Figure 2 , 4 As shown in Figure 7, a microwave generator 10 is installed on the side of the drying chamber 1. The waveguide of the microwave generator 10 passes through the side of the drying chamber 1 and is connected to the drying chamber 6. The microwaves generated by the microwave generator 10 enter the drying chamber 6 through the waveguide. The microwaves can penetrate the interior of the ginseng under the forest, causing the water molecules in it to vibrate at high frequency and generate heat, thereby achieving internal heating and drying. In combination with external drying, the drying speed is accelerated and the drying uniformity is ensured.

[0027] like Figures 1-4 As shown in Figure 7, the dehumidification device 3 includes a dehumidification fan 31 fixedly installed on the top of the drying chamber 1. The air inlet of the dehumidification fan 31 passes through the top of the drying chamber 1. The top of the drying chamber 1 is provided with an air inlet 32 ​​that communicates with the drying chamber 6. When the humidity in the drying chamber 6 exceeds the set value, the dehumidification fan 31 is activated to discharge the humid air. At the same time, fresh air from outside enters through the air inlet, forming an air circulation, thereby achieving precise control of the humidity in the drying chamber 6 and maintaining a constant humidity environment.

[0028] like Figures 1-4, 7 and 8, the left and right sides of the drying box 1 are respectively provided with pull-out grooves; the drainage device 9 comprises a left sliding plate 91 movably arranged in the left pull-out groove and a right sliding plate 92 movably arranged in the right pull-out groove, the opposite end faces of the left sliding plate 91 and the right sliding plate 92 are connected by clamping, and the clamping of the two forms an inclined plate body, in some specific embodiments, the angle of the inclined plate body is 10-15°, so that the water droplets are efficiently drained, which is suitable for drying different forms of forest ginseng, keeps the environmental humidity stable, and improves the drying efficiency; the drainage device 9 further comprises a support block 94 fixedly arranged at the rear side of the drying box 1, air cylinders 93 fixedly arranged at the two side portions of the support block 94, a sliding rod 96 parallel to the inclined plate body, and a connecting block 95 sleeved on the sliding rod 96, the two groups of air cylinders 93 are arranged on the two sides of the support block 94 and are parallel to the inclined plate body, the piston rod of the air cylinder 93 at the bottom is fixedly connected with the right sliding plate 92, and the piston rod of the air cylinder 93 at the top is fixedly connected with the left sliding plate 91; the two groups of air cylinders 93 are arranged on the two sides of the support block 94 and are parallel to the inclined plate body, the piston rod of the air cylinder 93 at the bottom is fixedly connected with the right sliding plate 92, and the piston rod of the air cylinder 93 at the top is fixedly connected with the left sliding plate 91; the connecting block 95 is arranged in two groups and is fixedly arranged at the top of the opposite end faces of the left sliding plate 91 and the right sliding plate 92, the sliding rod 96 is fixedly arranged at the inner side wall of the drying box 1 at both ends, and the sliding rod 96 and the connecting block 95 cooperate to provide guidance and support for the movement of the left sliding plate 91 and the right sliding plate 92, so as to ensure smooth movement; a drainage pipe 97 with a valve is arranged on the drying box 1, the drainage pipe 97 is located above the right pull-out groove, when the air cylinder 93 is contracted, the left sliding plate 91 and the right sliding plate 92 are clamped to form an inclined plate body, the water droplets of the forest ginseng drip along the inclined surface of the inclined plate body to the bottom end, at this time, the valve is opened to drain the accumulated water through the drainage pipe 97, the whole drainage process is efficient and complete, and the influence of the accumulated water on the drying quality of the forest ginseng in the drying box 1 is avoided; when the air cylinder 93 is elongated, the left sliding plate 91 and the right sliding plate 92 move away from each other, and an air passage is formed in the middle to ensure that the steam and airflow pass smoothly, so as to ensure normal drying operation.

[0029] As Figure 1 、 2, 4, 5 and 6, the drying box 1 is hinged with an observation door 11, which is convenient for the operator to observe the drying state of the forest under the ginseng in the drying chamber 6 at any time, and a material trolley 12 is arranged outside the drying box 1, which is used to place and move the drying trolley assembly 8, so as to facilitate the pushing of the drying trolley assembly 8 into the drying chamber 6; the drying trolley assembly 8 is composed of a bottom plate 81 with a groove at the bottom, a plurality of moving wheels 82 arranged uniformly at the bottom of the bottom plate 81, a reverse U-shaped frame 83 fixed on the top of the bottom plate 81, an angle adjusting mechanism 84 located on the reverse U-shaped frame 83, a plurality of placing frames 85 arranged uniformly on the reverse U-shaped frame 83, and a plurality of placing plates 86 inserted and matched on the top of the placing frames 85; the bottom of the placing plate 86 is connected by a plurality of groups of horizontal strip plates and vertical strip plates in a staggered manner, forming a plurality of uniformly distributed sieve holes, which facilitates the falling of moisture and the penetration of drying air, so that the upper and lower surfaces of the forest under the ginseng can be fully contacted with hot air, improving the drying uniformity, the placing plate 86 is used to place the forest under the ginseng, the placing frame 85 can adjust the inclined position according to the need, the moving wheel 82 makes the drying trolley assembly 8 move flexibly, and the overall structure is convenient for batch placing and taking of the forest under the ginseng.

[0030] As shown in Figure 5 and 6 , the reverse U-shaped frame 83 is provided with a connecting block 846 on the outer side wall; The angle adjusting mechanism 84 includes a driving motor 841 fixed on the connecting block 846, a rotating rod 842 rotatably arranged between the two groups of connecting blocks 846, a connecting rod 843 rotatably penetrating through the two side ends of the reverse U-shaped frame 83, a worm wheel 844 fixed on the end of the connecting rod 843, and a worm 845 sleeved on the rotating rod 842 corresponding to the worm wheel 844, the placing frame 85 is U-shaped, and the two ends thereof are fixedly sleeved on the two ends of the connecting rod 843, the output shaft of the driving motor 841 penetrates through the connecting block 846 and is connected with the end of the rotating rod 842, the worm wheel 844 and the worm 845 are meshed, after starting the driving motor 841, the output shaft thereof rotates to drive the connecting rod 843 to rotate, and then drives the worm 845 to rotate, so as to drive the worm wheel 844 to rotate, realizing the rotation of the connecting rod 843, adjusting the inclination angle of the placing frame 85, achieving the purpose of adjusting the angle of the placing plate 86, dynamically and flexibly adjusting the placing posture of the forest under the ginseng on the placing plate 86, increasing the contact area and frequency of different forms of forest under the ginseng with drying medium, optimizing the ventilation condition to accelerate the evaporation and discharge of moisture, realizing efficient and uniform drying of the forest under the ginseng, and guaranteeing the drying quality.

[0031] As shown in Figures 1-7As shown, the bottom of the drying box 1 is uniformly provided with support columns 13, and the steam generation box 41 is located inside the support columns 13. The support columns 13 support the drying box 1, so that the steam generation box 41 has sufficient installation and working space. The drying box 1 is provided with a controller 14. A plurality of groups of temperature sensors 141 and humidity sensors 142 are uniformly arranged in the drying box 1. The controller 14 is electrically connected with the temperature sensors 141 and the humidity sensors 142. The circulating fan 21, the electric heating tube box 22, the air blower 43, the steam heater 42, the microwave generator 10, the dehumidification fan 31, the air cylinder 93 and the driving motor 841 are electrically connected with the controller 14. The temperature sensors 141 and the humidity sensors 142 monitor the temperature and humidity in the drying chamber 6 in real time, and transmit signals to the controller 14. The controller 14 automatically controls the operating state of each device according to the preset drying parameters, realizes automatic and accurate control of the drying process, and ensures that the forest-grown ginseng is stably dried in a constant humidity environment.

[0032] In specific use, 1. Pretreatment stage The forest-grown ginseng to be dried is uniformly placed on the placement plate 86 of the drying trolley. The inclination angle of the placing frame 85 is adjusted through the angle adjusting mechanism 84 to optimize the drying contact surface. The drying trolley is pushed into the drying chamber 6, and the observation door 11 is closed.

[0033] 2. Initial drainage The air cylinder 93 of the drainage device 9 is retracted, and the left sliding plate 91 and the right sliding plate 92 are closed to form an inclined surface. Water droplets are collected on the inclined surface and discharged through the drain pipe 97. Then, the air cylinder 93 is extended to open the left sliding plate 91 and the right sliding plate 92 of the drainage device 9, restore the steam passage, and complete the initial water removal pretreatment.

[0034] 3. Multi-mode cooperative drying First stage: microwave dominated dehydration (moisture content 60%-45%, 2-3h) In this stage, the initial moisture content of the forest-grown ginseng is high. The controller 14 starts the microwave generator 10 to rapidly evaporate the internal moisture. At the same time, the steam drying device 4 is started. The steam heater 42 maintains the output of 40℃ low-temperature steam. The steam is sent into the drying chamber 6 through the air blower 43. The wet and hot airflow forms a protective film on the surface of the forest-grown ginseng, which inhibits the hardening and crust formation caused by the rapid evaporation of surface moisture. The top circulating drying device 2 operates at low power. The electric heating tube box 22 is heated to 50-55℃. The circulating fan 21 drives the hot air to form a slight convection, which timely removes the water vapor evaporated from the surface to avoid local humidity saturation.

[0035] Second stage: steam dominated constant humidity (moisture content 45%-25%, 3-4h) When the moisture sensor 142 detects that the moisture content drops to 45%, the controller automatically switches the mode: the steam heater 42 is heated to 60℃, the steam output is increased, and the relative humidity in the drying chamber 6 is maintained at 50%-60%, which softens the surface tissue of the forest ginseng and promotes the continuous migration of internal moisture to the surface; the electric heating tube box 22 of the circulating drying device 2 is synchronously heated to 60℃, and the circulating fan 21 is speeded up to strengthen the convection effect of hot air and steam and accelerate the evaporation of surface water vapor.

[0036] Third stage: hot air dominated deep dehydration (moisture content 25%-12%, 2-3h) When the moisture content drops to 25%, enter the low-temperature shaping stage: the steam drying device 4 reduces the output and only maintains the humidity in the drying chamber 6 at 30%-40%; the electric heating tube box 22 of the circulating drying device 2 is adjusted to 45-50℃, and the circulating fan 21 is speeded up to remove residual moisture through strong convection hot air, realize low-temperature deep dehydration, and avoid the deterioration of forest ginseng caused by high temperature; the microwave generator 10 is intermittently operated at a low power of 100-200W (pause for 5 minutes every 10 minutes), which uses weak microwave energy to inhibit the internal moisture from gathering and ensure the uniformity of drying.

[0037] 4. Intelligent monitoring The controller 14 monitors the temperature and humidity in real time, automatically adjusts the hot air temperature, steam volume and microwave power. At the same time, the drying process can be periodically adjusted to ensure uniformity.

[0038] 5. Completion and material taking After drying, all devices are turned off.

[0039] Pull out the drying cart and transfer it to the material trolley 12 to complete the batch material taking.

[0040] The above describes the present application and its embodiments, which are not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A convection through-flow constant-humidity forest ginseng drying machine, comprising a drying box (1), characterized in that: The top of the drying box (1) is provided with a circulating drying device (2) and a moisture removal device (3), and the bottom is provided with a steam drying device (4); The drying box (1) is provided with a bottom through plate (5) with uniform air holes, which divides the drying box (1) into a drying chamber (6) and a steam chamber (7), and the drying chamber (6) is provided with a movable drying trolley assembly (8); The steam drying device (4) comprises a steam generating box (41) embedded in the bottom of the drying box (1), and a drainage device (9) is arranged between the steam generating box (41) and the bottom through plate (5).

2. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 1, characterized in that: The circulating drying device (2) comprises a circulating fan (21) fixedly arranged on the top of the drying box (1) and an electric heating pipe box (22) fixedly arranged in the drying chamber (6), the circulating fan (21) is symmetrically arranged at two opposite corner positions on the top of the drying box (1), the air outlet pipe of the circulating fan (21) is communicated with the electric heating pipe box (22) below, and the bottom of the electric heating pipe box (22) is provided with an air outlet.

3. The counter-current through-drying machine for constant-moisture forest-grown ginseng according to claim 1, characterized in that: The steam drying device (4) further comprises a steam heater (42) in the steam generating box (41) and a blower (43) on one side of the steam generating box (41), the air outlet pipe of the blower (43) penetrates through the steam generating box (41) and is communicated with the air inlet of the steam heater (42), the top of the steam generating box (41) is uniformly provided with through holes, and the air outlet of the steam heater (42) is communicated with the drying chamber (6) through the through holes.

4. The counter-current through-drying machine for constant-moisture forest-grown ginseng according to claim 1, characterized in that: The drying box (1) is provided with a microwave generator (10) on the side, and the waveguide pipe of the microwave generator (10) penetrates through the side of the drying box (1) and is communicated with the drying chamber (6).

5. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 1, characterized in that: The moisture removal device (3) comprises a moisture removal fan (31) fixedly arranged on the top of the drying box (1), and the air inlet of the moisture removal fan (31) penetrates through the top of the drying box (1); the top of the drying box (1) is provided with an air inlet pipe (32) communicated with the drying chamber (6).

6. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 1, characterized in that: The left and right sides of the drying box (1) are respectively provided with pull-out grooves; the drainage device (9) comprises a left sliding plate (91) movably arranged in the left pull-out groove and a right sliding plate (92) movably arranged in the right pull-out groove, the opposite end faces of the left sliding plate (91) and the right sliding plate (92) are matched by clamping, and the clamped left sliding plate (91) and right sliding plate (92) form an inclined plate body; A drain pipe (97) with a valve is arranged on the top of the drying box (1), and the drain pipe (97) is located above the right pull-out groove.

7. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 6, characterized in that: The drainage device (9) further comprises a support block (94) fixedly arranged on the rear side of the drying box (1) and air cylinders (93) fixedly arranged on the two side portions of the support block (94), the two groups of air cylinders (93) are arranged on the two sides of the support block (94) and are parallel to the inclined plate body, the piston rod of the air cylinder (93) located at the bottom is fixedly connected with the right sliding plate (92), and the piston rod of the air cylinder (93) located at the top is fixedly connected with the left sliding plate (91).

8. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 1, characterized in that: The drying box (1) is hinged with an observation door (11), and the drying box (1) is provided with a material trolley (12). The baking trolley assembly (8) is composed of a bottom plate (81) with a slot at the bottom, moving wheels (82) evenly arranged at the bottom of the bottom plate (81), an inverted U-shaped frame (83) fixed at the top of the bottom plate (81), an angle adjusting mechanism (84) on the inverted U-shaped frame (83), placing frames (85) evenly arranged on the inverted U-shaped frame (83), and a storage plate (86) inserted and matched on the top of the placing frames (85). The bottom of the storage plate (86) is connected by a plurality of groups of horizontal strip plates and vertical strip plates in a staggered manner to form uniformly distributed screen holes.

9. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 8, characterized in that: The inverted U-shaped frame (83) is provided with connecting blocks (846) on the outer side walls in an up-down arrangement. The angle adjusting mechanism (84) comprises a driving motor (841) fixed on the connecting blocks (846), a rotating shaft (842) rotatably arranged between the two groups of connecting blocks (846), a connecting rod (843) rotatably penetrating through both sides of the inverted U-shaped frame (83), a worm wheel (844) fixed at the end of the connecting rod (843), and a worm gear (845) corresponding to the worm wheel (844) and sleeved on the rotating shaft (842).

10. The counter-current through-drying machine for constant-moisture forest ginseng according to claim 8, characterized in that: The placing frame (85) is in a U-shaped structure, and both ends are fixedly sleeved on both ends of the connecting rod (843). The output shaft of the driving motor (841) penetrates through the connecting blocks (846) and is connected with the end of the rotating shaft (842). The worm wheel (844) and the worm gear (845) are meshingly arranged.

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