A drying device and method for a pseudo-ginseng freeze-drying production line

Abstract

The present invention relates to the technical field of Panax notoginseng processing, and specifically relates to a drying device and method for a Panax notoginseng freeze-drying production line, which includes a U-shaped drying box, a refrigerating machine, a vacuum machine, and a drying machine installed above the drying box. A number of storage racks are placed inside the drying box, and a number of trays are placed inside the storage racks. A conveying device is arranged at the inner wall of the bottom of the drying box, and sealing parts are arranged at the joints of the bending section and the access section of the drying box. In the present invention, the conveying device is set to drive a number of storage racks to alternately shift inside the drying box, and first freeze and then enter the vacuum environment of the bending section of the drying box for sublimation drying, and finally drying. Here, the bending section of the drying box is closed by closing the sealing part to form a vacuum environment, and the storage rack can pass smoothly by opening the sealing part, so as to orderly carry out the drying treatment of Panax notoginseng and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of Panax notoginseng processing, and specifically 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 commonly dehydrated and pulverized by freeze-drying, air drying, and drying.

[0003] Patent Application No. CN202122158247.4 discloses a freeze-drying treatment chamber for Panax notoginseng freeze-drying production. The downward-sloping sides of the guide plates are arranged in opposite directions, and a discharge groove is provided on the downward-sloping side of the guide plates; sliding strips are fixed on the left and right side walls of the guide plates, and the other side of the sliding strips is slidably arranged on the upper and lower ends of the guide rods of the treatment chamber body, and the upper and lower ends of the guide rods are fixed on the inner walls of the upper and lower sides of the chute; springs are sleeved on the guide rods, one end of the spring is fixedly connected to the inner wall of one side of the chute, 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 below the inner end of the discharge pipe, and the left side of the discharge plate is inclined upward; dehumidifying bags are fixed on the upper surfaces of the two guide plates and the discharge plate, and can dry the Panax notoginseng during the transmission process, without affecting the operation and processing of the next batch of Panax notoginseng, thereby improving the processing efficiency.

[0004] The drying effect of the above patent using dehumidifying bags is not as good as that of dehydration and pulverization by freeze-drying, air drying, and drying. Moreover, the Panax notoginseng is conveyed through the inclined guide plates, and it is easy to collide and break after drying, which is not conducive to collecting the dried Panax notoginseng and results 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 art.

[0006] To achieve the above purpose, on the one hand, the present invention provides a drying device for a Panax notoginseng freeze-drying production line, including a U-shaped drying box, a refrigerating machine installed above the feeding section of the drying box, a vacuum machine installed above the bending section of the drying box, and a drying machine installed at the discharging section of the drying box. The access ports of the drying box are both hinged with box doors. A number of storage racks are placed inside the drying box, and a number of trays are placed inside the storage racks. A conveying device is arranged at the inner bottom wall of the drying box, and sealing parts are arranged at the joints between the bending section and the access sections of the drying box; the conveying device includes a toothed groove belt sleeved on the inner wall of the drying box and a conveying motor for driving the toothed groove belt to move in a cycle. One side of the bottom of the storage rack is vertically slidably clamped with a pulling frame, the pulling frame is detachably connected to the toothed groove belt, and elastic wheel groups are sleeved at the bottom corners of the storage rack.

[0007] The closing part includes a closing frame that is snap-fitted with the inner wall of the drying box, a closing curtain embedded inside the closing frame, and a servo motor for driving the closing curtain to rise or fall to open or close the closing frame; a closing cover is snap-fitted to the inner diameter side wall of the bending section of the drying box. The closing cover is U-shaped and its straight plate side is fixedly attached to the closing frame. An avoidance opening for avoiding the translation of the pulling frame is provided on one side wall of the bottom of the closing frame. The bottom end of the closing cover is in sliding contact with the pulling frame, and a fan-shaped closing block is rotatably connected to the bottom of its straight plate. One arc end of the closing block is a tangent plane and the tangent plane is in sliding contact with the top surface of the toothed groove belt.

[0008] As a further improvement of this technical solution, the storage rack has a box-type frame structure and a pair of clamping blocks are welded to one side of its bottom. The pulling frame has a right-angled triangular frame structure and its vertical section is slidably sleeved and matched with the pair of clamping blocks.

[0009] As a further improvement of this technical solution, a pull rod inserted into the avoidance opening is provided on the outer side of the horizontal section of the pulling frame. A silica gel block is embedded in the bottom surface of the closing frame vertical side section and located at the avoidance opening, and the top surface of the silica gel block abuts against the top surface of the avoidance opening.

[0010] As a further improvement of this technical solution, a linkage rod horizontally extends on the outer side of the middle part of the pull rod. The linkage rod is in sliding connection with the arc surface of the closing block. Insertion posts are vertically symmetrically provided on the bottom surface of the linkage rod. A number of pairs of insertion holes are provided on the top surface of the toothed groove belt, and the insertion posts are correspondingly inserted into the insertion holes.

[0011] As a further improvement of this technical solution, a storage box is provided on one side of the top of the closing frame. A chute penetrating through to the storage box is provided on the center line of the bottom surface of the closing frame. The closing curtain is made of stainless steel sheet and a sliding plate is welded to its bottom end. The two sides of the sliding plate are slidably clamped with the pair of chutes, and the height of the sliding plate is greater than the height of the avoidance opening from the bottom surface of the closing frame.

[0012] As a further improvement of this technical solution, threaded rings are welded to both sides of the top of the sliding 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 with a lead screw threadedly connected to the threaded ring.

[0013] As a further improvement of this technical solution, sealing strips are adhered to both opposite side walls of the chute. Slope seats are provided on both sides of the long side of the bottom of the closing frame. The elastic wheel group includes a roller, a wheel cover covering the roller, and a column welded to the top of the wheel cover. A shaft sleeve is sleeved outside the column, and 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 end of the column, and the radius of the roller is at least equal to the height of the slope seat.

[0014] As a further improvement of the technical solution, a bayonet for rotatably clamping the closing block is provided at the bottom of the straight plate of the closing cover, and the arcs of the two bayonets 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 groove belt.

[0015] As a further improvement of the technical solution, a partition is welded between the inner walls of the middle layer of the storage rack. A plurality of support plates are welded at equal intervals on the inner walls on both sides of the storage rack, and the tray is lapped and matched with each pair of support plates.

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

[0017] S1. Start the conveying motor to drive the toothed groove belt to circulate. When a pair of jacks rotate to the outside of the drying box, push a storage rack close to the conveying motor, and insert a pair of insertion posts into this pair of jacks. Continue to operate in this way until the storage racks are distributed inside the entrance section and the bending section of the drying box;

[0018] S2. Then insert a number of trays containing pseudo-ginseng raw materials onto the storage racks in the discharge section of the drying box;

[0019] S3. Then start the refrigerator to freeze-dry the pseudo-ginseng raw materials;

[0020] S4. Start the servo motor to open the closing curtain and wind it into the storage box. Then start the conveying motor to drive the three storage racks to circulate and shift, and then close the closing curtain;

[0021] S5. Then start the vacuum machine to suck the bending section of the drying box to form a vacuum environment, so that the freeze-dried pseudo-ginseng raw materials are sublimated and dried; at the same time, put another batch of pseudo-ginseng raw materials into the rotated storage rack;

[0022] S6. Then open the closing curtain and start the conveying motor to drive the three storage racks to circulate and shift again. After the storage rack reaches the predetermined position, close the closing curtain;

[0023] S7. Then start the refrigerator, the vacuum machine and the dryer at the same time, and freeze-dry, sublimation-dry and dry the pseudo-ginseng materials in different states respectively;

[0024] S8. Perform the drying treatment on the pseudo-ginseng materials in a reciprocating manner according to S1-S7.

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

[0026] 1. The drying device and method for the Panax notoginseng freeze-drying production line, through the drying box with adjacent inlets and outlets, support Panax notoginseng on the storage rack and move it in a circle inside the drying box for freezing and drying. Through the provided conveying device, several storage racks are driven to shift alternately, first frozen and then enter the vacuum environment of the bending section of the drying box for sublimation drying, and finally dried. Here, the bending section of the drying box is closed by closing the closing part to form a vacuum environment, and the storage rack can pass smoothly by opening the closing part, so as to carry out the drying treatment of Panax notoginseng in an orderly manner, improving production efficiency.

[0027] 2. The drying device and method for the Panax notoginseng freeze-drying production line, through several elastic wheel groups arranged at the bottom of the storage rack, and using the pulling rack to be vertically slidably connected with the storage rack, so that the storage rack is connected to the toothed groove belt through the pulling rack and is driven to shift; enabling the storage rack to automatically adjust its posture when entering and leaving the drying box and the closing part to ensure smooth shifting.

[0028] 3. The drying device and method for the Panax notoginseng freeze-drying production line, through the provided closed cover to enclose the space occupied by the toothed groove belt, and rotatably connecting a closing block at the bottom of the closed cover to automatically fall and block, and can be pushed aside when the pulling rack passes through, which not only ensures the closed environment of the bending section of the drying box but also does not interfere with the alternating shifting of the storage rack, with a clever and applicable design. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic for helping the understanding of the present invention and do not specifically limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art, under the teaching of the present invention, can select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

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

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

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

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

[0034] Figure 5 It 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 group of the present invention;

[0036] Figure 7 Structural schematic diagram of the combined state of the conveying device and the closing part of the present invention;

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

[0038] Figure 9 Structural schematic diagram of the closing frame of the present invention;

[0039] Figure 10 Structural schematic diagram of the closing curtain assembly of the present invention;

[0040] Figure 11 Exploded view of the closing cover of the present invention;

[0041] The meanings of each label in the figure are as follows:

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

[0043] 170, elastic wheel set; 171, roller; 172, wheel cover; 173, bushing; 174, compression spring; 180, pulling frame; 181, pull rod; 182, linkage rod; 183, insertion post;

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

[0045] 300, closing part; 310, closing frame; 311, storage box; 312, chute; 313, avoidance opening; 314, silicone block; 315, ramp seat; 320, closing curtain; 321, sliding plate; 322, threaded ring; 330, servo motor; 340, closing cover; 341, bayonet; 350, closing block. Detailed implementation manners

[0046] Combined with the description of the specific implementation manners of the present invention and the accompanying drawings, the details of the present invention can be more clearly understood. However, the specific implementation manners of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, the concepts of those skilled in the art based on any possible deformation of the present invention 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 can be directly connected or indirectly connected through an intermediate medium.

[0047] As used herein, the terms "central axis", "vertical", "horizontal", "front", "rear", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, in the description of the present invention, the meaning of "a number of" is two or more, unless otherwise specifically defined.

[0048] Please refer to Figures 1 - 11 As shown, the present invention provides a drying device for a pseudo-ginseng freeze-drying production line, including a U-shaped drying chamber 100, a refrigerator 110 installed above the feeding section of the drying chamber 100, a vacuum pump 120 installed above the bending section of the drying chamber 100, and a dryer 130 installed at the discharging section of the drying chamber 100. The refrigerator 110 is composed of a refrigeration compressor unit and uses a Freon unit and R22 refrigerant for refrigeration; the vacuum pump 120 is composed of a rotary vane vacuum pump or a water ring pump and a Roots vacuum pump. An electromagnetic air release stop valve is installed on the vacuum pump pipeline. When the vacuum pump stops working, it can automatically close the vacuum pipeline and at the same time release air into the pump to prevent the vacuum pump oil from flowing back into the vacuum pipeline due to negative pressure; the dryer 130 is used to heat the materials in the drying chamber 100 so that the materials can continuously obtain sublimation heat to meet the specified moisture content requirements of the articles; it is composed of a pipeline pump, a heater, an inlet and outlet pipeline, a liquid temperature controller, etc.; all of the above are prior arts and will not be elaborated here;

[0049] Both the inlet and outlet ports of the drying chamber 100 are hinged with a chamber door 140, and the chamber door 140 opens towards the outside of the drying chamber 100, enabling the storage rack 150 to circulate and shift inside and outside the drying chamber 100 for feeding and taking materials; a number of storage racks 150 are placed inside the drying chamber 100, and a number of trays 160 are placed inside the storage racks 150 for placing pseudo-ginseng raw materials; a conveying device 200 is provided at the inner wall of the bottom of the drying chamber 100, and sealing parts 300 are provided at the joints between the bending section and the inlet and outlet sections of the drying chamber 100 to ensure that a vacuum environment can be formed inside the bending section of the drying chamber 100 under the suction of the vacuum pump 120, so as to sublimate and dry the freeze-dried pseudo-ginseng raw materials;

[0050] In addition, a condenser is installed inside the top of the bending section of the drying chamber 100 for condensing the sublimated water vapor. The condenser is a cylinder made of stainless steel or iron, and a condensing pipe is wound inside, which is respectively connected to the refrigerator 110 group to form a refrigeration cycle system; the connection between the condenser and the drying chamber 100 uses 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 oven 100 and a conveying motor 220 for driving the toothed belt 210 to move in a cycle; the conveying motor 220 is fixedly connected to the outer side wall of the drying oven 100 by bolts, and a transmission gear 221 meshing with the toothed belt 210 is coaxially connected to the lower end of the output shaft of the conveying motor 220; the outside of the toothed belt 210 is wrapped with a stainless steel sheet or a plastic pipe to ensure that the toothed belt 210 reduces the degree of deformation when affected by hot and cold environments; on one side of the bottom of the storage rack 150, a pulling rack 180 is vertically slidably clamped, and the pulling rack 180 is detachably connected to the toothed belt 210. Elastic wheel sets 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 by means of the pulling rack 180 and is driven to move; the elastic wheel sets 170 and the pulling rack 180 are vertically slidably arranged, so that the storage rack 150 automatically adjusts its posture when entering and exiting the drying oven 100 to ensure smooth movement.

[0052] Furthermore, the closing part 300 includes a closing frame 310 that is fitted and clamped with the inner wall of the drying oven 100, a closing curtain 320 embedded inside 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 bending section of the drying oven 100; a closing cover 340 is clamped on the inner diameter side wall of the bending section of the drying oven 100. The closing cover 340 is U-shaped and its straight plate side 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; an avoidance opening 313 for avoiding the horizontal translation of the pulling rack 180 is opened on one side wall of the bottom of the closing frame 310. The bottom end of the closing cover 340 is in sliding contact with the pulling rack 180, and a fan-shaped closing block 350 is rotatably connected to the bottom of the straight plate of the pulling rack 180. One arc end of the closing block 350 is a tangent plane and the tangent plane is in sliding contact with the top surface of the toothed belt 210. That is, the space between the closing cover 340 and the toothed belt 210 is blocked by the closing block 350, so that the pulling rack 180 pushes up the closing block 350 to avoid it and passes through when passing through the closing frame 310.

[0053] Furthermore, the storage rack 150 has a box-type frame structure and a pair of clamping blocks 153 are welded on one side of its bottom. The pulling rack 180 has a right-angled triangular frame structure and its vertical sections on both sides 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 horizontally pulls the storage rack 150 to move;

[0054] A pull rod 181 inserted into the avoidance opening 313 is provided on the outside of the horizontal section of the pulling rack 180. A silica gel block 314 is embedded in the bottom surface of the vertical side section of the closing frame 310 and located at the avoidance opening 313. The top surface of the silica gel block 314 abuts against the top surface of the avoidance opening 313. That is, the pull rod 181 squeezes the silica gel block 314 to compress and pass through the avoidance opening 313, and then the silica gel block 314 rebounds to block the avoidance opening 313.

[0055] Further, a linkage rod 182 is horizontally extended and provided on the outer side of the middle part of the pull rod 181. The linkage rod 182 is slidably connected to the inclined side surface of the closing block 350 and is used to push open the closing block 350 to pass through smoothly. Insertion posts 183 are vertically and symmetrically provided on the bottom surface of the linkage rod 182. A plurality of pairs of insertion holes 211 are formed on the top surface of the toothed groove belt 210. The insertion posts 183 are correspondingly inserted into the insertion holes 211, so that the pulling frame 180 is connected to the toothed groove belt 210 to move 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 closing frame 310. A sliding groove 312 penetrating through to the storage box 311 is formed on the center line of the bottom surface of the closing frame 310. The closing curtain 320 is made of stainless steel sheet and a sliding plate 321 is welded to the bottom end thereof to increase the strength of the closing curtain 320 and ensure that the closing curtain 320 will not deform and slip out of the closing frame 310 when the vacuum machine 120 sucks to form a vacuum weld.

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

[0058] Further, sealing strips are adhered to the opposite side walls of the sliding groove 312 to improve the sealing performance. Slope seats 315 are provided on both sides of the long sides of the bottom of the closing frame 310. The elastic wheel set 170 includes a roller 171, a wheel cover 172 covering the roller 171, and a column welded to the top of the wheel cover 172. A sleeve 173 is sleeved outside the column. The sleeve 173 is sleeved and matched with the bottom of the storage rack 150. A compression spring 174 is fixedly arranged between the sleeve 173 and the top end of the column. The radius of the roller 171 is at least equal to the height of the slope seat 315, so that the roller 171 can roll through smoothly after contacting the slope seat 315, and under the stretching action of the compression spring 174, the storage rack 150 can pass through stably.

[0059] Further, a bayonet 341 for rotatably clamping the closing block 350 is provided at the straight bottom of the closing cover 340, so that the closing block 350 is pushed by the linkage rod 182 and hidden in the bayonet 341; the arcs of the two bayonets 341 are arranged in opposite directions, so that the linkage rod 182 that circulates and displaces with the storage rack 150 is pushed open by contacting the inclined side 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. Therefore, after the linkage rod 182 passes through, the closing block 350 automatically falls and rotates to contact the toothed groove belt 210 to block the space below the closing cover 340; since the side of the closing frame 310 fits the side of the straight plate of the closing cover 340, the connection between the bayonet 341 and the inside of the bent section of the drying box 100 is blocked.

[0060] Further, a partition plate 151 is welded between the inner walls of the middle layer of the storage rack 150 to improve the stability 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 is lapped with each pair of support plates 152, so that the tray 160 is stably placed and convenient to take and place.

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

[0062] S1. Start the conveyor motor 220 to drive the toothed groove belt 210 to circulate. When a pair of jacks 211 rotate to the outside of the drying box 100, push a storage rack 150 close to the conveyor motor 220, and insert a pair of plug posts 183 into this pair of jacks 211. Continue to operate in this way until the storage racks 150 are distributed in the access section and the bent section of the drying box 100;

[0063] S2. Then insert a plurality of trays 160 containing notoginseng raw materials onto the storage rack 150 in the discharge section of the drying box 100;

[0064] S3. Then start the refrigerator 110 to freeze-dry the notoginseng raw materials;

[0065] S4. Then start the servo motor 330 to open the closing curtain 320 and wind it into the storage box 311. Then start the conveyor motor 220 to drive the three storage racks 150 to circulate and displace, and then close the closing curtain 320;

[0066] S5. Then start the vacuum machine 120 to suck the bent section of the drying box 100 to form a vacuum environment, so that the freeze-dried notoginseng raw materials are sublimated and dried; at the same time, put another batch of notoginseng raw materials into the rotated storage rack 150;

[0067] S6. Then, open the closing curtain 320 and start the conveying motor 220 to drive the three storage racks 150 to cycle and shift again. After the storage rack 150 reaches the predetermined position, close the closing curtain 320;

[0068] S7. Then, start the refrigerator 110, the vacuum machine 120 and the dryer 130 simultaneously to freeze-dry, sublimation-dry and dry the pseudo-ginseng materials in different states respectively;

[0069] S8. Reciprocate the drying process of the pseudo-ginseng materials according to S1-S7.

[0070] It should be noted that the above embodiments are only for explaining the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within 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); A pull rod (181) plugged into the avoidance opening (313) is provided on the outside of the horizontal section of the pulling frame (180); a silicone block (314) is embedded in the vertical side section of the closing frame (310) and located on the bottom surface of the avoidance opening (313); the top surface of the silicone block (314) abuts against the top surface of the avoidance opening (313); A linkage rod (182) is horizontally extended from the outside of the middle 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); The bottom of the straight plate of the closing cover (340) is provided with a snap-fit ​​socket (341) for rotatably snap-fitting with the closing block (350), and the arcs of the two snap-fit ​​sockets (341) are arranged in opposite directions.

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 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).

4. The drying device for the freeze-drying production line of Panax notoginseng according to claim 3, 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).

5. The drying device for the freeze-drying production line of Panax notoginseng according to claim 4, 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).

6. The drying device for the freeze-drying production line of Panax notoginseng according to claim 5, characterized in that: The lower end of the output shaft of the conveying motor (220) is coaxially connected to a transmission gear (221) that meshes with the toothed belt (210).

7. The drying device for the notoginseng freeze-drying production line according to claim 6, 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).

8. 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 claim 7, 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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