Drying device and method for pseudo-ginseng freeze-drying production line

Abstract

The invention relates to the technical field of pseudo-ginseng processing, in particular to a drying device for a pseudo-ginseng freeze-drying production line and a method thereof.The drying device comprises a U-shaped drying box, a refrigerating machine, a vacuum machine and a drying machine, the refrigerating machine, the vacuum machine and the drying machine are installed above the drying box, a plurality of storage racks are placed in the drying box, and a plurality of trays are placed in the storage racks; a conveying device is arranged on the inner wall of the bottom of the drying box, and sealing parts are arranged at the joints of the bending section and the in-out section of the drying box. The conveying device drives the multiple storage racks to alternately move in the drying box, freezing is conducted firstly, then sublimation drying is conducted in the vacuum environment of the bending section of the drying box, finally drying is conducted, the bending section of the drying box is closed by closing the closing part to form the vacuum environment, and the storage racks can smoothly pass by opening the closing part; therefore, pseudo-ginseng drying treatment is carried out orderly, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of Panax notoginseng processing, and in particular to a drying device and method for a Panax notoginseng freeze-drying production line. Background Art

[0002] The rhizome of Panax notoginseng is a traditional Chinese medicine and is often processed into Panax notoginseng powder for packaging and use. In the production line, Panax notoginseng is often dehydrated and powdered by freeze drying, air flow drying and oven drying.

[0003] Application number CN202122158247.4 discloses a freeze-drying processing bin for freeze-drying production of Panax notoginseng, which is arranged in opposite directions through the downwardly inclined sides of the guide plate, and a discharge trough is provided on the downwardly inclined side of the guide plate; the slide bar is fixed on the left and right side walls of the guide plate, and the other side of the slide bar is slidably arranged on the upper and lower ends of the guide rod of the processing bin body and fixed on the inner walls on the upper and lower sides of the slide trough; the spring is sleeved on the guide rod, one end of the spring is fixedly connected to the inner wall of one side of the slide trough, and the other end of the spring is fixedly connected to one side wall of the guide plate; the right side wall of the discharge plate is arranged on the lower side of the inner end of the discharge pipe, and the left side of the discharge plate is inclined upward; the dehumidification bag is fixed on the two guide plates and the upper surface of the discharge plate, so that the Panax notoginseng can be dried during the transmission process, thereby not affecting the operation and processing of the next batch of Panax notoginseng, thereby improving the processing efficiency.

[0004] The effect of the dehumidification bag drying treatment used in the above patent is not as good as the dehydration and pulverization treatment effects of freeze drying, air flow drying and oven drying. In addition, the Panax notoginseng is transported through an inclined guide plate, which may cause collision and breakage after drying, which is not conducive to collecting the dried Panax notoginseng, resulting in low production efficiency. Summary of the invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a drying device and method for a Panax notoginseng freeze-drying production line to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, on the one hand, the present invention provides a drying device for a freeze-drying production line of Panax notoginseng, comprising a U-shaped drying box, a refrigerator installed above a feeding section of the drying box, a vacuum machine installed above a curved section of the drying box, and a drying machine installed at a discharging section of the drying box, wherein the inlet and outlet ports of the drying box are both hinged with a box door, a plurality of racks are placed inside the drying box, a plurality of trays are placed inside the racks, a conveying device is arranged at the inner wall of the bottom of the drying box, and a sealing portion is arranged at the connection between the curved section of the drying box and the inlet and outlet sections; the conveying device comprises a toothed belt sleeved with the inner wall of the drying box and a conveying motor for driving the toothed belt to circulate; a pulling frame is vertically slidably connected to one side of the bottom of the rack, the pulling frame is detachably connected to the toothed belt, and elastic wheel groups are sleeved at the bottom corners of the rack;

[0007] The closing part includes a closing frame that matches and is clamped with the inner wall of the drying box, a closing curtain embedded in the closing frame, and a servo motor for driving the closing curtain to rise or fall to open and close the closing frame; a closing cover is clamped on the inner diameter side wall of the curved section of the drying box, the closing cover is U-shaped and its straight plate side is fixed to the closing frame, a side wall at the bottom of the closing frame is provided with an escape opening for avoiding the translation of the pulling frame, the bottom end of the closing cover is in sliding contact with the pulling frame, and the bottom of the straight plate is rotatably connected to a fan-shaped closing block, one arc end of the closing block is a cutting plane and the cutting plane is in sliding contact with the top surface of the toothed belt.

[0008] As a further improvement of the technical solution, the storage rack is a box-type frame structure with a pair of clamping blocks welded to one side of its bottom, and the pulling frame is a right-angle tripod structure with a pair of clamping blocks slidably engaged with both sides of its vertical section.

[0009] As a further improvement of the technical solution, a pull rod plugged into the avoidance opening is provided on the outer side of the horizontal section of the pulling frame, and a silicone block is embedded in the bottom surface of the vertical side section of the closed frame located at the avoidance opening, and the top surface of the silicone block contacts the top surface of the avoidance opening.

[0010] As a further improvement of the technical solution, a linkage rod is horizontally extended on the outer middle part of the pull rod, and the linkage rod is slidably connected to the arc surface of the closing block. The bottom surface of the linkage rod is vertically symmetrically provided with plug posts, and the top surface of the toothed belt is provided with several pairs of sockets, and the plug posts are correspondingly plugged into the sockets.

[0011] As a further improvement of the technical solution, a storage box is provided on one side of the top of the closed frame, and a slide groove penetrating to the storage box is opened on the center line of the bottom surface of the closed frame. The closed curtain is made of stainless steel and a slide plate is welded to the bottom end thereof. Both sides of the slide plate are slidably engaged with a pair of slide grooves, and the height of the slide plate is greater than the height of the avoidance opening from the bottom surface of the closed frame.

[0012] As a further improvement of the technical solution, threaded rings are welded on both sides of the top of the slide plate, the central axis of the threaded ring is vertically arranged, and the lower end of the output shaft of the servo motor is coaxially connected to a screw rod threadedly connected to the threaded ring.

[0013] As a further improvement of the present technical solution, sealing strips are bonded to the opposite side walls of the slide groove, ramp seats are provided on both sides of the long sides of the bottom of the closed frame, the elastic wheel group includes a roller, a wheel cover connected to the roller cover, and a column welded on the top of the wheel cover, the outer sleeve of the column is provided with a shaft sleeve, the shaft sleeve is sleeved and matched with the bottom of the storage rack, a compression spring is fixedly arranged between the shaft sleeve and the top of the column, and the radius of the roller is at least equal to the height of the ramp seat.

[0014] As a further improvement of the technical solution, a bayonet for rotatably engaging with the closing block is provided at the bottom of the straight plate of the closing cover, and the arcs of the two bayonet are arranged in opposite directions. The lower end of the output shaft of the conveying motor is coaxially connected with a transmission gear meshing with the toothed belt.

[0015] As a further improvement of the technical solution, partitions are welded between the middle inner walls of the rack, a number of support plates are welded at even intervals on the inner walls on both sides of the rack, and the tray is overlapped with each pair of support plates.

[0016] On the other hand, the present invention provides a drying method for a Panax notoginseng freeze-drying production line, using the above-mentioned drying device for a Panax notoginseng freeze-drying production line, comprising the following steps:

[0017] S1. Start the conveying motor to drive the toothed belt to circulate until a pair of sockets are rotated to the outside of the drying box, push a rack close to the conveying motor, and plug a pair of pins into the pair of sockets, and continue to operate in this way until racks are distributed inside the entrance and exit sections and the curved section of the drying box;

[0018] S2, then inserting several trays loaded with Panax notoginseng raw materials into the racks in the discharge section of the drying box;

[0019] S3, then start the refrigerator to freeze-dry the raw materials of Panax notoginseng;

[0020] S4, restart the servo motor to open the closed curtain and roll it into the storage box, then start the conveying motor to drive the three racks to shift cyclically, and then close the closed curtain;

[0021] S5, then start the vacuum machine to suck the curved section of the drying box to form a vacuum environment, so that the freeze-dried Panax notoginseng raw material can be sublimated and dried; at the same time, another batch of Panax notoginseng raw materials are placed in the transferred storage rack;

[0022] S6, then open the closed curtain and start the conveying motor to drive the three racks to shift cyclically again, and then close the closed curtain after the racks reach the predetermined position;

[0023] S7, then simultaneously start the refrigerator, vacuum machine and dryer, and respectively perform freeze drying, sublimation drying and drying on the Panax notoginseng materials in different states;

[0024] S8, drying the Panax notoginseng material repeatedly according to S1-S7.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The drying device and method for the freeze-drying production line of Panax notoginseng are provided, through the drying boxes with adjacent entrances and exits, and the Panax notoginseng is supported by the racks to move a circle inside the drying box for freezing and drying, and a plurality of racks are driven to shift alternately by the provided conveying device, and are first frozen and then enter the vacuum environment of the curved section of the drying box for sublimation drying, and finally dried and dried. Here, the curved section of the drying box is sealed by closing the sealing part to form a vacuum environment, and the racks are allowed to pass smoothly by opening the sealing part, so that the Panax notoginseng drying process is carried out in an orderly manner, thereby improving production efficiency.

[0027] 2. The drying device and method for the freeze-drying production line of Panax notoginseng are characterized by arranging a plurality of elastic wheel groups at the bottom of the rack and vertically slidingly connecting the rack with a pulling frame, so that the rack is connected to a toothed belt with the help of the pulling frame and is driven to shift; the rack automatically adjusts its posture when entering and exiting a drying box and a closed part to ensure smooth shifting.

[0028] 3. The drying device and method used in the Panax notoginseng freeze-drying production line close the space occupied by the toothed belt by means of a closed cover, and a closed block connected to the bottom of the closed cover is rotated to automatically fall down and block, and can be pushed to avoid the passage when the pulling frame passes through, thereby ensuring the closed environment of the curved section of the drying box and not interfering with the alternating shifting of the storage rack. The design is ingenious and applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art, under the guidance of the present invention, select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0030] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal assembly structure of the drying box of the present invention;

[0032] Figure 3 It is a front view of the overall assembly structure of the present invention;

[0033] Figure 4 It is a side view of the overall assembly structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the assembly structure of the storage rack of the present invention;

[0035] Figure 6 It is a schematic diagram of the assembly structure of the elastic wheel set of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the combined state of the conveying device and the sealing part of the present invention;

[0037] Figure 8 For the present invention Figure 7 The main view;

[0038] Fig. 9 It is a schematic diagram of the closed frame structure of the present invention;

[0039] Fig.10 It is a schematic diagram of the assembly structure of the closed curtain of the present invention;

[0040] Fig.11 It is a disassembled diagram of the closure cover of the present invention;

[0041] The meaning of each number in the figure is:

[0042] 100, drying box; 110, refrigerator; 120, vacuum machine; 130, drying machine; 140, box door; 150, storage rack; 151, partition; 152, support plate; 153, clamping block; 160, tray;

[0043] 170, elastic wheel set; 171, roller; 172, wheel cover; 173, shaft sleeve; 174, compression spring; 180, pulling frame; 181, pull rod; 182, linkage rod; 183, plug column;

[0044] 200, conveying device; 210, toothed belt; 211, jack; 220, conveying motor; 221, transmission gear;

[0045] 300, closing part; 310, closing frame; 311, storage box; 312, slide; 313, escape opening; 314, silicone block; 315, slope seat; 320, closing curtain; 321, slide plate; 322, threaded ring; 330, servo motor; 340, closing cover; 341, bayonet; 350, closing block. DETAILED DESCRIPTION

[0046] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, the technical personnel's conception is based on any possible variation of the present invention, which should be regarded as belonging to the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which means direct connection and indirect connection through an intermediate medium.

[0047] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0048] See also Figure 1-Figure 11 As shown, the present invention provides a drying device for a freeze-drying production line of Panax notoginseng, comprising a U-shaped drying box 100, a refrigerator 110 installed above the feeding section of the drying box 100, a vacuum machine 120 installed above the bending section of the drying box 100, and a dryer 130 installed at the discharge section of the drying box 100, wherein the refrigerator 110 is composed of a refrigeration compressor unit, and refrigeration is performed by a Freon unit and an R22 refrigerant; the vacuum machine 120 is composed of a rotary vane vacuum pump or a water ring pump and a Roots vacuum pump, and an electromagnetic venting stop valve is installed on the vacuum pump pipeline, which can automatically close the vacuum pipeline when the vacuum pump stops working, and at the same time put air into the pump to prevent the vacuum pump oil from being released back into the vacuum pipeline due to negative pressure; the dryer 130 is used to heat the material in the drying box 100 so that the material can continuously obtain sublimation heat so that the article can meet the specified moisture content requirement; it is composed of a pipeline pump, a heater, an inlet and outlet pipeline, a liquid temperature controller, etc.; the above are all prior arts and will not be repeated here;

[0049] The inlet and outlet ports of the drying box 100 are both hinged with a box door 140, and the box door 140 opens toward the outside of the drying box 100, so that the racks 150 are cyclically shifted from inside and outside the drying box 100 to discharge and take out materials; a plurality of racks 150 are placed inside the drying box 100, and a plurality of trays 160 are placed inside the racks 150 for placing the raw materials of Panax notoginseng; a conveying device 200 is arranged at the inner wall of the bottom of the drying box 100, and a sealing part 300 is arranged at the connection between the curved section of the drying box 100 and its inlet and outlet sections, so as to ensure that a vacuum environment can be formed inside the curved section of the drying box 100 under the suction of the vacuum machine 120, so that the raw materials of Panax notoginseng in a freeze-dried state can be sublimated and dried;

[0050] In addition, a condenser is installed inside the top of the curved section of the drying box 100 for condensing sublimated water vapor. The condenser is in the shape of a cylinder made of stainless steel or iron, with condenser tubes coiled inside, which are respectively connected to the refrigerator 110 group to form a refrigeration cycle system; the condenser is connected to the drying box 100 with a vacuum butterfly valve to control the opening and closing operation.

[0051] Specifically, the conveying device 200 includes a toothed belt 210 sleeved on the inner wall of the drying box 100 and a conveying motor 220 for driving the toothed belt 210 to circulate; the conveying motor 220 is fixedly connected to the outer wall of the drying box 100 by bolts, and the lower end of the output shaft of the conveying motor 220 is coaxially connected to a transmission gear 221 meshing with the toothed belt 210; the outer surface of the toothed belt 210 is wrapped with a stainless steel skin or a plastic tube to ensure that the toothed belt 210 reduces deformation when affected by a hot or cold environment; a pulling frame 180 is vertically slidably connected to the bottom side of the storage rack 150, and the pulling frame 180 is detachably connected to the toothed belt 210, and elastic wheel groups 170 are sleeved at the bottom corners of the storage rack 150; so that the storage rack 150 is connected to the toothed belt 210 with the help of the pulling frame 180, and is driven to shift; the elastic wheel group 170 and the pulling frame 180 The vertical sliding arrangement enables the rack 150 to automatically adjust its posture when entering and exiting the drying box 100 to ensure smooth displacement.

[0052] Furthermore, the closing part 300 includes a closing frame 310 that matches and is clamped with the inner wall of the drying box 100, a closing curtain 320 embedded in the closing frame 310, and a servo motor 330 for driving the closing curtain 320 to rise or fall to open and close the closing frame 310; so that the storage rack 150 can enter and exit the curved section of the drying box 100; the inner diameter side wall of the curved section of the drying box 100 is clamped with a closing cover 340, which is U-shaped and has a straight plate side surface that is fixedly attached to the closing frame 310, and is used to close the gap formed by the space occupied by the toothed belt 210. The bottom of the closing frame 310 has a side wall provided with an escape opening 313 for avoiding the translation of the pulling frame 180, the bottom end of the closing cover 340 is in sliding contact with the pulling frame 180, and the bottom of the straight plate of the pulling frame 180 is rotatably connected with a fan-shaped closing block 350, one arc end of the closing block 350 is a cutting plane and the cutting plane is in sliding contact with the top surface of the toothed belt 210, that is, the closing block 350 is used to block the space between the closing cover 340 and the toothed belt 210, so that when the pulling frame 180 passes through the closing frame 310, the upper closing block 350 is avoided and passed.

[0053] Furthermore, the storage rack 150 is a box-type frame structure and a pair of clamping blocks 153 are welded on one side of the bottom thereof, and the pulling rack 180 is a right-angle tripod structure and the two sides of the vertical section thereof are sleeved and slidably matched with the pair of clamping blocks 153, so that the pulling rack 180 slides up and down on the side wall of the storage rack 150 and pulls the storage rack 150 to move laterally;

[0054] A pull rod 181 which is plugged into the avoidance opening 313 is provided on the outer side of the horizontal section of the pulling frame 180, and a silicone block 314 is embedded in the vertical side section of the closing frame 310 and located at the bottom surface of the avoidance opening 313. The top surface of the silicone block 314 contacts the top surface of the avoidance opening 313, that is, the silicone block 314 is squeezed by the pull rod 181 and compressed to pass through the avoidance opening 313, and then the silicone block 314 rebounds to block the avoidance opening 313.

[0055] Furthermore, a linkage rod 182 is horizontally extended on the outer middle part of the pull rod 181, and the linkage rod 182 is slidably connected to the oblique side surface of the closing block 350, so as to push the closing block 350 open and pass smoothly; the bottom surface of the linkage rod 182 is vertically symmetrically provided with plug posts 183, and the top surface of the toothed belt 210 is provided with a plurality of pairs of sockets 211, and the plug posts 183 are correspondingly plugged into the sockets 211, so that the pulling frame 180 is connected to the toothed belt 210 and moves synchronously, thereby driving the storage rack 150 to shift.

[0056] In addition, a storage box 311 is provided on one side of the top of the closed frame 310, and a slide groove 312 is provided on the center line of the bottom surface of the closed frame 310 to penetrate the storage box 311. The closed curtain 320 is made of stainless steel and a slide plate 321 is welded to the bottom end thereof to increase the strength of the closed curtain 320 and ensure that the closed curtain 320 will not be deformed and slip out of the closed frame 310 when the vacuum machine 120 sucks to form a vacuum welding.

[0057] The two sides of the slide plate 321 are slidably engaged with a pair of slide grooves 312, and the height of the slide plate 321 is greater than the height of the avoidance opening 313 from the bottom surface of the closed frame 310; threaded rings 322 are welded on both sides of the top of the slide plate 321, and the central axis of the threaded ring 322 is vertically arranged, and the lower end of the output shaft of the servo motor 330 is coaxially connected to a screw rod threadedly connected to the threaded ring 322. Since the slide plate 321 is higher than the avoidance opening 313, the threaded ring 322 can be arranged above the avoidance opening 313 to prevent the screw rod from passing through the avoidance opening 313 and interfering with the smooth passage of the pulling frame 180.

[0058] Furthermore, sealing strips are bonded to the opposite side walls of the slide groove 312 to improve the sealing performance; ramp seats 315 are provided on both sides of the long side of the bottom of the closed frame 310, and the elastic wheel group 170 includes a roller 171, a wheel cover 172 connected to the roller 171, and a column welded on the top of the wheel cover 172, and the outer sleeve of the column is provided with a shaft sleeve 173, and the shaft sleeve 173 is sleeved and matched with the bottom of the storage rack 150, and a compression spring 174 is fixedly provided between the shaft sleeve 173 and the top of the column, and the radius of the roller 171 is at least equal to the height of the ramp seat 315, so that the roller 171 can roll through smoothly after contacting the ramp seat 315, and under the tensile action of the compression spring 174, the storage rack 150 can be ensured to pass stably.

[0059] Furthermore, a bayonet 341 is provided at the bottom of the straight plate of the closing cover 340, which is rotatably engaged with the closing block 350, so that the closing block 350 is pushed by the linkage rod 182 and hidden in the bayonet 341; the arcs of the two bayonet 341 are arranged in opposite directions, so that the linkage rod 182 that cyclically shifts with the storage rack 150 pushes it open by contacting the oblique side surface of the closing block 350; since the closing block 350 is fan-shaped, when the closing block 350 rotates into the bayonet 341, its center of gravity is biased downward, so after the linkage rod 182 passes, the closing block 350 automatically falls and rotates to contact the toothed belt 210 to block the space below the closing cover 340; since the side surface of the closing frame 310 is in contact with the side surface of the straight plate of the closing cover 340, the bayonet 341 is cut off from being connected to the inner part of the curved section of the drying box 100.

[0060] Furthermore, partitions 151 are welded between the middle inner walls of the rack 150 to improve the stability of the rack 150; a number of support plates 152 are welded at even intervals on the inner walls on both sides of the rack 150, and the tray 160 overlaps with each pair of support plates 152, so that the tray 160 is stably placed and easy to take and put.

[0061] The present invention also provides a drying method for a Panax notoginseng freeze-drying production line, using the above-mentioned drying device for a Panax notoginseng freeze-drying production line, comprising the following steps:

[0062] S1, start the conveying motor 220 to drive the toothed belt 210 to circulate until the pair of sockets 211 rotate to the outside of the drying box 100, push a rack 150 close to the conveying motor 220, and plug a pair of pins 183 into the pair of sockets 211, and continue to operate in this way until the racks 150 are distributed inside the entrance and exit section and the curved section of the drying box 100;

[0063] S2, then inserting a plurality of trays 160 loaded with Panax notoginseng raw materials into the rack 150 in the material discharge section of the drying box 100;

[0064] S3, then start the refrigerator 110 to freeze-dry the Panax notoginseng raw material;

[0065] S4, restart the servo motor 330 to open the closed curtain 320 and roll it into the storage box 311, then start the conveying motor 220 to drive the three racks 150 to shift cyclically, and then close the closed curtain 320;

[0066] S5, then start the vacuum machine 120 to suck the curved section of the drying box 100 to form a vacuum environment, so that the freeze-dried Panax notoginseng raw material can be sublimated and dried; at the same time, another batch of Panax notoginseng raw materials are placed in the transferred storage rack 150;

[0067] S6, then open the closed curtain 320 and start the conveying motor 220 to drive the three racks 150 to shift cyclically again, and then close the closed curtain 320 after the racks 150 reach the predetermined position;

[0068] S7, simultaneously starting the refrigerator 110, the vacuum machine 120 and the dryer 130, and performing freeze drying, sublimation drying and drying on the Panax notoginseng materials in different states respectively;

[0069] S8, drying the Panax notoginseng material repeatedly according to S1-S7.

[0070] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying device for a Panax notoginseng freeze-drying production line, comprising a U-shaped drying box (100), a refrigerator (110) installed above an inlet section of the drying box (100), a vacuum machine (120) installed above a curved section of the drying box (100), and a drying machine (130) installed at an outlet section of the drying box (100), wherein both inlet and outlet ports of the drying box (100) are hingedly connected with a box door (140), characterized in that: A plurality of racks (150) are placed inside the drying box (100), and a plurality of trays (160) are placed inside the racks (150). A conveying device (200) is provided at the inner wall of the bottom of the drying box (100), and a closing portion (300) is provided at the connection between the curved section and the entrance and exit sections of the drying box (100); the conveying device (200) comprises a toothed belt (210) sleeved on the inner wall of the drying box (100) and a conveying motor (220) for driving the toothed belt (210) to circulate; a pulling frame (180) is vertically slidably engaged at one side of the bottom of the rack (150), and the pulling frame (180) is detachably connected to the toothed belt (210); and elastic wheel sets (170) are sleeved at the bottom corners of the racks (150); The sealing portion (300) comprises a sealing frame (310) matched and clamped with the inner wall of the drying box (100), a sealing curtain (320) embedded in the sealing frame (310), and a servo motor (330) for driving the sealing curtain (320) to rise or fall to open or close the sealing frame (310); a sealing cover (340) is clamped on the inner diameter side wall of the curved section of the drying box (100); the sealing cover (340) is U-shaped and its straight plate side surface is fitted and fixed to the sealing frame (310); a side wall at the bottom of the sealing frame (310) is provided with an avoidance opening (313) for avoiding translation of the pulling frame (180); the bottom end of the sealing cover (340) is in sliding contact with the pulling frame (180), and the bottom of the straight plate is rotatably connected to a fan-shaped sealing block (350); one arc end of the sealing block (350) is a tangent plane and the tangent plane is in sliding contact with the top surface of the toothed belt (210).

2. The drying device for the freeze-drying production line of Panax notoginseng according to claim 1, characterized in that: The storage rack (150) is a box-type frame structure and has a pair of clamping blocks (153) welded to one side of its bottom. The pulling rack (180) is a right-angle tripod structure and has two sides of its vertical section that are sleeved and slidably engaged with the pair of clamping blocks (153).

3. The drying device for the freeze-drying production line of Panax notoginseng according to claim 2, characterized in that: A pull rod (181) plugged into the avoidance opening (313) is provided on the outside of the horizontal section of the pulling frame (180), and a silicone block (314) is embedded in the vertical side section of the closing frame (310) and located at the bottom surface of the avoidance opening (313), and the top surface of the silicone block (314) abuts against the top surface of the avoidance opening (313).

4. The drying device for the freeze-drying production line of Panax notoginseng according to claim 3, characterized in that: A linkage rod (182) is horizontally extended from the outer middle part of the pull rod (181), and the linkage rod (182) is slidably connected to the arc surface of the closing block (350). The bottom surface of the linkage rod (182) is vertically symmetrically provided with plug posts (183). The top surface of the toothed belt (210) is provided with a plurality of pairs of plug holes (211), and the plug posts (183) are correspondingly plugged into the plug holes (211).

5. The drying device for the freeze-drying production line of Panax notoginseng according to claim 4, characterized in that: A storage box (311) is provided on one side of the top of the closed frame (310), a slide groove (312) penetrating to the storage box (311) is provided on the midline of the bottom surface of the closed frame (310), the closed curtain (320) is made of stainless steel and a slide plate (321) is welded to the bottom end thereof, two sides of the slide plate (321) are slidably engaged with a pair of slide grooves (312), and the height of the slide plate (321) is greater than the height of the avoidance opening (313) from the bottom surface of the closed frame (310).

6. The drying device for the freeze-drying production line of Panax notoginseng according to claim 5, characterized in that: Threaded rings (322) are welded on both sides of the top of the slide plate (321), the central axis of the threaded ring (322) is arranged vertically, and the lower end of the output shaft of the servo motor (330) is coaxially connected to a screw rod threadedly connected to the threaded ring (322).

7. The drying device for the notoginseng freeze-drying production line according to claim 6, characterized in that: The opposite side walls of the slide groove (312) are bonded with sealing strips, and the bottom long sides of the closed frame (310) are provided with ramp seats (315). The elastic wheel group (170) comprises a roller (171), a wheel cover (172) connected to the roller (171), and a column welded on the top of the wheel cover (172). The outer sleeve of the column is provided with a shaft sleeve (173), and the shaft sleeve (173) is sleeved and matched with the bottom of the storage rack (150). A compression spring (174) is fixedly provided between the shaft sleeve (173) and the top of the column. The radius of the roller (171) is at least equal to the height of the ramp seat (315).

8. The drying device for the freeze-drying production line of Panax notoginseng according to claim 7, characterized in that: The bottom of the straight plate of the closing cover (340) is provided with a bayonet (341) for rotatably engaging with the closing block (350), and the arcs of the two bayonet (341) are arranged in opposite directions. The lower end of the output shaft of the conveying motor (220) is coaxially connected to a transmission gear (221) meshing with the toothed belt (210).

9. The drying device for the freeze-drying production line of Panax notoginseng according to claim 8, characterized in that: A partition plate (151) is welded between the middle inner walls of the storage rack (150), a plurality of support plates (152) are welded at equal intervals on the inner walls on both sides of the storage rack (150), and the tray (160) overlaps and cooperates with each pair of support plates (152).

10. A drying method for a Panax notoginseng freeze-drying production line, using the drying device for a Panax notoginseng freeze-drying production line according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, starting the conveying motor (220) to drive the toothed belt (210) to circulate until the pair of sockets (211) rotate to the outside of the drying box (100), pushing a storage rack (150) close to the conveying motor (220), and plugging a pair of plug posts (183) into the pair of sockets (211), and continuing this operation until the storage racks (150) are distributed inside the entrance and exit sections and the curved section of the drying box (100); S2, then inserting a plurality of trays (160) loaded with Panax notoginseng raw materials into the storage rack (150) in the material discharge section of the drying box (100); S3, then starting the refrigerator (110) to freeze-dry the Panax notoginseng raw material; S4, restarting the servo motor (330) to open the closed curtain (320) and retract it into the storage box (311), then starting the conveying motor (220) to drive the three storage racks (150) to shift cyclically, and then closing the closed curtain (320); S5, then start the vacuum machine (120) to suck the curved section of the drying box (100) to form a vacuum environment, so that the freeze-dried Panax notoginseng raw material can be sublimated and dried; at the same time, another batch of Panax notoginseng raw materials is placed in the transferred storage rack (150); S6, then opening the closing curtain (320) and starting the conveying motor (220) to drive the three storage racks (150) to shift cyclically again, and then closing the closing curtain (320) after the storage racks (150) reach the predetermined position; S7, simultaneously starting the refrigerator (110), the vacuum machine (120) and the drying machine (130) to perform freeze drying, sublimation drying and drying on the Panax notoginseng materials in different states respectively; S8, drying the Panax notoginseng material repeatedly according to S1-S7.

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