A multi-layered shelf freezer box structure

Abstract

The application belongs to the technical field of freeze-drying machine box bodies, and particularly relates to a multi-layer partition plate type freeze-drying machine box body structure, which comprises a cylindrical shell, the inside of the shell is provided with multiple partition plates through a support, the multiple partition plates are distributed in multiple layers in a top-down manner in the inside of the shell and each layer is composed of two partition plates which are symmetrically distributed left and right, the inside of the shell is provided with two slide rails which are symmetrically arranged in a top-down manner, a sliding frame is slidably arranged between the two slide rails, multiple material plates are arranged on the sliding frame, and the multiple material plates and the multiple partition plates are staggered and distributed in a top-down manner. The application forms an isolation area between the lower side of each partition plate and the upper side of the material plate, avoids the problem of prolonged freezing time caused by the continuous heat exchange between the surface of the material and the warm air of the box body in the traditional scheme, and the temperature control assembly can also transfer the excess cold energy into the isolation area, actively refrigerates the air and the material in the isolation area, and greatly shortens the freezing time of the material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of freeze-dryer box bodies, and particularly relates to a multi-layer partition plate type freeze-dryer box body structure. BACKGROUND

[0002] The multi-layer partition plate type freeze-dryer has become a core equipment for batch production in the fields of medicine, food and the like due to the advantage of large unit volume material loading, and a heat transfer structure of "partition plate-material plate" is used to realize the whole process of pre-freezing, sublimation and analysis of the material in the box body.

[0003] The existing multi-layer partition plate type freeze-dryer box body is designed with "partition plate groups arranged in an upper-lower interval", and the partition plate groups are distributed at intervals in the box body. A serpentine pipe is integrated in each partition plate, and temperature regulation of-40~50℃ is realized through refrigerant circulation. The serpentine pipe is a core transfer carrier of cold and heat. The material is placed on the material plate through a tray or a syringe bottle, and the material plate is sent into the box body through an independent support. The lower surface of the material plate is tightly attached to the upper side of the lower partition plate to transfer cold and heat.

[0004] The existing multi-layer partition plate type freeze-dryer box body still has the following defects in actual application and needs to be improved: 1. Material freeze-drying is mainly divided into three stages of pre-freezing, sublimation and analysis drying. In the pre-freezing stage of the material, the gap between the material plate and the partition plate makes the material in a "semi-open environment". Since the box body does not perform vacuumization in the early stage of pre-freezing of the material, the cold transferred by the partition plate is exchanged with the air in the box body during the cooling of the material above the partition plate. Therefore, the time for the material to be cooled to the predetermined temperature is delayed.

[0005] 2) And the material freezing mainly relies on the one-way contact of the partition plate with the material above it to transfer cold. However, in fact, the lower side of the partition plate also cools the environment around the lower side. Since there is a large gap between the lower side of the partition plate and the material plate below it, the cold of the lower side of the partition plate can only be transferred to the material on the surface of the material plate below through radiation. This method has limited effect on the refrigeration of the material on the material plate below. When the cold is transferred in one direction, a temperature gradient in which the lower surface of the material freezes first and the upper surface freezes later is easily formed. Therefore, the heat preservation time needs to be additionally prolonged to ensure that the whole material is frozen, further increasing the pre-freezing time. SUMMARY

[0006] In order to solve the above problems, the application provides a multi-layer partition plate type freeze-dryer box body structure for solving the problems mentioned in the background.

[0007] In order to achieve the above object, the embodiment of the present application provides the following technical scheme: the present application provides a kind of multilayer partition plate formula freeze dryer box structure, including cylindrical shell, the inside of the shell is provided with multiple partitions by support, multiple partitions are in the inside of shell and are distributed in multiple layers up and down and each layer is composed of two partitions and is distributed symmetrically left and right, the inside of the shell is provided with two slide rails that are symmetric up and down, two slide rails are commonly slidably arranged with sliding frame, multiple material plates are arranged on the sliding frame, and multiple material plates are distributed staggeredly up and down with multiple partitions.The partition plate includes the fixed connection of the plate frame one with the inner wall of the shell by the support, the horizontal plate is fixedly arranged at the inside middle section position of the plate frame one, and the isolation cover with the opening downward is slidably arranged on the upper side of the plate frame one, the sealing frame with the opening up and down is slidably arranged on the lower side of the plate frame one, and the drive assembly is commonly arranged between the isolation cover, the sealing frame and the horizontal plate, and the temperature control assembly is arranged on the upper side of the horizontal plate.The material plate includes the plate frame two connected with the sliding frame, and the material support plate is slidably arranged in the plate frame two.The isolation cover moves up and contacts the material support plate above and lifts the material on the surface of the material support plate to a certain height, so that the material support plate is close to the plate frame one above, and the material on the material support plate is isolated from the outside of the shell by the lower movement of the sealing frame and the abutment of the upper end surface of the plate frame two.

[0008] According to an advantageous embodiment, the isolation region is composed of the space formed by the lower port of the plate frame one, the horizontal plate inside the plate frame one, the upper port corresponding to the plate frame two, the material plate inside the plate frame two, and the sealing frame.

[0009] According to an advantageous embodiment, there is a gap of 1-5 cm between the plate frame two and the two plate frames one corresponding up and down.

[0010] According to an advantageous embodiment, the drive assembly includes four double-headed screws, the four double-headed screws are rotatably arranged at the corresponding corners of the horizontal plate, the upper and lower sections of the double-headed screw are provided with opposite thread sections, and the two thread sections are threadedly connected with the connecting lug plate, and the upper and lower connecting lug plates on the same double-headed screw are fixedly connected with the corresponding isolation cover and sealing frame.

[0011] According to an advantageous embodiment, a drive motor is fixedly arranged at the position on the upper side of the horizontal plate and close to each double-headed screw, and the output shaft of the drive motor is commonly connected with the corresponding double-headed screw through a reducer.

[0012] According to an advantageous embodiment, the temperature control assembly includes a serpentine heat exchange pipe fixedly arranged on the upper side of the horizontal plate, and the two ends of the serpentine heat exchange pipe are connected with external temperature control equipment through connecting pipes penetrating one side of the corresponding plate frame one.

[0013] According to an advantageous embodiment, four slide seats are fixedly arranged on the slide frame, two above and two below, and rollers are arranged on the slide seats.

[0014] According to an advantageous embodiment, the locking assembly comprises two slide plates which are symmetrically arranged on the upper side of the slide rail through a guide column, and two locking columns are fixedly arranged on the opposite sides of the two slide plates, the locking columns are movably inserted into the slide groove, and a U-shaped connecting rod is fixedly arranged on the side of each slide plate which is away from the other slide plate, a driving rod is rotatably arranged on the left and right sides of the slide rail, two U-shaped fork plates are fixedly arranged on the driving rod, and the U-shaped fork plates are movably sleeved on the surface of the U-shaped connecting rod.

[0015] Compared with the prior art, the multi-layer partition plate type freeze dryer box structure provided by the embodiment of the present application has the following beneficial effects: 1. By moving the sealing frame downward and combining with the material plate, an isolation area is formed between the lower side of each partition plate and the upper side of the material plate, thereby avoiding the problem of prolonged freezing time caused by continuous heat exchange between the material surface and the warm air in the box in the traditional scheme, and the temperature control assembly can also transfer excess cold to the isolation area to actively cool the air and material in the isolation area, thereby greatly shortening the freezing time of the material.

[0016] 2. The isolation cover moves upward and is attached to the lower side of the material support plate, which can move the material support plate upward, reduce the volume of each corresponding isolation area, and accelerate the cooling of the isolation area. In addition, the material below is cooled by being attached to the corresponding isolation cover through the material support plate, and the material above and on the side is cooled through the isolation area, thereby simultaneously cooling the material from multiple directions, greatly reducing the temperature gradient caused by single-direction heat transfer, allowing the material to reach the target temperature faster and more uniformly, and further improving the freezing efficiency of the material. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an external perspective view of the present application.

[0018] Figure 2 It is a perspective view of the material plate before being pushed into the shell in the present application.

[0019] Figure 3 It is a front view of the present application.

[0020] Figure 4 It is a front view of the partition plate in the present application.

[0021] Figure 5 It is a front view of the material plate in the present application.

[0022] Figure 6 Fig. 1 is a front view of the structure of the present application.

[0023] Figure 7 Fig. 2 is a schematic view of the state of the present application after the isolation cover and the sealing frame move relative to the material plate.

[0024] Figure 8 Fig. 3 is a partial sectional view of the present application.

[0025] Figure 9 Fig. 4 is a schematic view of the present application. Figure 8 Fig. 5 is an enlarged view of part A of Fig. 4.

[0026] Figure 10 Fig. 6 is an external three-dimensional structure of the present application.

[0027] In the figure, the reference signs are as follows: 1, housing; 2, partition plate; 21, plate frame one; 22, cross plate; 23, isolation cover; 24, sealing frame; 25, driving assembly; 251, double-end screw; 252, driving motor; 26, temperature control assembly; 3, slide rail; 4, sliding frame; 5, material plate; 51, plate frame two; 52, material support plate; 6, isolation area; 7, slide; 8, locking assembly; 81, slide plate; 82, locking column; 83, U-shaped connecting rod; 84, driving rod; 85, U-shaped fork plate; 9, temperature control cavity. DETAILED DESCRIPTION

[0028] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 10 The present application will be described in further detail.

[0029] Please refer to the accompanying drawings Figures 1-3 A multi-layer partition plate type freeze dryer box structure includes a cylindrical housing 1, the inside of the housing 1 is provided with a plurality of partition plates 2 through a support (not shown in the figure), the plurality of partition plates 2 are distributed in multiple layers from top to bottom inside the housing 1 and each layer is composed of two partition plates 2 distributed symmetrically left and right. The inside of the housing 1 is provided with two slide rails 3 symmetrically from top to bottom, the sliding frame 4 is commonly provided between the two slide rails 3, the sliding frame 4 is provided with a plurality of material plates 5, the plurality of material plates 5 are staggered distributed with the plurality of partition plates 2 from top to bottom.

[0030] In specific work, the material plates 5 carry materials and are pushed into the housing 1 through the sliding frame 4 cooperating with the slide rails 3, so that each material plate 5 can be between the corresponding two partition plates 2 from top to bottom, and the materials on the material plates 5 are frozen and dried through the two partition plates 2. In the present scheme, the inside of the housing 1 is also connected with the external vacuum equipment for vacuumizing the inside of the housing 1.

[0031] Please refer to Figure 2 , Figure 3 andFigure 10 The four slide seats 7 are fixed on the slide frame 4, and the upper and lower two slide seats 7 are a group. The slide seats 7 are provided with rollers. The upper and lower two slide rails 3 are provided with slide grooves for the movement and guidance of the slide seats 7. The lower slide rail 3 is provided with a locking assembly 8 for locking the lower two slide seats 7. The locking assembly 8 comprises two slide plates 81. The two slide plates 81 are symmetrically distributed on the upper side of the slide rail 3 and are slidably connected to the slide rail 3 through guide columns. The opposite sides of the two slide plates 81 are fixedly provided with two locking columns 82 which are distributed in front and back. The locking columns 82 are movably inserted into the slide groove. The slide seats 7 are provided with locking holes at the corresponding positions on the left and right side walls. The sides of the two slide plates 81 away from each other are fixedly provided with U-shaped connecting rods 83. The left and right sides of the slide rail 3 are rotatably provided with driving rods 84. The driving rods 84 are fixedly provided with two U-shaped yoke plates 85. The U-shaped yoke plates 85 are movably sleeved on the surfaces of the U-shaped connecting rods 83.

[0032] The slide frame 4 is moved by the external feeding device. The upper and lower slide seats 7 on the slide frame 4 can be aligned with the corresponding slide grooves on the slide rail 3. The slide frame 4 and all the material plates 5 are pushed into the designated position in the shell 1. After reaching the designated position, the workers can rotate the driving rods 84 to make the U-shaped yoke plates 85 rotate. The slide plates 81 are pushed to move on the slide rail 3 through the corresponding U-shaped connecting rods 83. The locking columns 82 on the slide plates 81 move towards the corresponding side walls of the slide seats 7 and are inserted into the pre-set locking holes in the side walls of the slide seats 7. The slide frame 4 is locked. Then the material is frozen and dried. When it is needed to move again, the slide seats 7 can be unlocked by rotating the driving rods 84 in the opposite direction.

[0033] Referring to Figure 1 , Figure 4 and Figure 8 , the partition plate 2 comprises a plate frame one 21 which is fixedly connected to the inner wall of the shell 1 through a support. The inner part of the plate frame one 21 is fixedly provided with a horizontal plate 22 near the middle section. The upper side of the plate frame one 21 is slidably provided with an isolation cover 23 which is open downward. The lower side of the plate frame one 21 is slidably provided with a sealing frame 24 which is open upward and downward. The isolation cover 23, the sealing frame 24 and the horizontal plate 22 are jointly provided with a driving assembly 25. The upper side of the horizontal plate 22 is provided with a temperature control assembly 26.

[0034] As shown in Figure 6 , in the single partition plate 2, a closed temperature control cavity 9 is formed by the horizontal plate 22, the upper section of the plate frame one 21 and the isolation cover 23. The temperature control cavity 9 is cooled or heated by the temperature control assembly 26. The plate frame one 21, the isolation cover 23, the sealing frame 24 and the horizontal plate 22 are cooled or heated by the temperature control cavity 9. The corresponding isolation cover 23 and the sealing frame 24 can be driven to move up and down to adjust the position by the driving assembly 25.

[0035] Referring to Figure 4、 Figure 8 and Figure 9 The driving assembly 25 includes four double-headed screws 251, which are respectively arranged at the corresponding corners of the horizontal plate 22. The upper and lower sections of the double-headed screw 251 are provided with opposite threaded sections, and the two threaded sections are respectively threadedly connected with a connecting lug. The upper and lower connecting lugs on the same double-headed screw 251 are respectively fixedly connected with the corresponding isolation cover 23 and the sealing frame 24. The driving motor 252 is fixedly arranged on the upper side of the horizontal plate 22 and close to each double-headed screw 251. The output shaft of the driving motor 252 is drivingly connected with the corresponding double-headed screw 251 through a reducer (not shown in the figure). The driving motor 252 drives the double-headed screw 251 to rotate, so that the isolation cover 23 and the sealing frame 24 are respectively moved up and down through the connecting lug.

[0036] It should be particularly pointed out that the driving motor 252 is a high-performance motor, which can work normally at -60-120 degrees Celsius while ensuring the sealing, and the upper side of the horizontal plate 22 is provided with a protective sleeve for protecting the wires of the driving motor 252. At the same time, the lubrication of the motor bearing adopts a low-temperature special lubricating grease (such as synthetic fluorine grease).

[0037] Referring to Figure 4 and Figure 8 The temperature control assembly 26 includes a serpentine heat exchange pipe fixedly arranged on the upper side of the horizontal plate 22. The two ends of the serpentine heat exchange pipe are connected with external temperature control equipment through connecting pipes penetrating one side of the corresponding plate frame one 21. The external temperature control equipment cooperates with the serpentine heat exchange pipe to cool or heat the temperature control cavity 9. The heat is transferred to the plate frame one 21, the isolation cover 23, the sealing frame 24 and the horizontal plate 22 in the partition plate 2, so that each part of the partition plate 2 is quickly cooled or heated.

[0038] Referring to Figure 2 , Figure 4 and Figure 5 The material plate 5 includes a plate frame two 51 connected with the sliding frame 4, and a material supporting plate 52 slidingly arranged in the plate frame two 51. There is a 5cm gap (1-5cm spacing can be selected according to the model and material of the plate frame one 21) between the plate frame two 51 and the upper and lower corresponding two plate frame ones 21. After the sealing frame 24 moves downward and abuts against the upper port of the corresponding plate frame two 51, the lower port of the corresponding plate frame one 21, the horizontal plate 22 inside the plate frame one 21, the upper port of the corresponding plate frame two 51 below, the material plate 5 inside the plate frame two 51 and the corresponding sealing frame 24 jointly form an isolation area 6, which seals the material in the area, as shown in Figure 7 .

[0039] As Figure 7As shown, the specific boundary of the isolation area 6 is: the lower surface of the horizontal plate 22 (top boundary), the inner wall of the lower half of the first plate frame 21 (left and right boundaries), the inner wall of the sealing frame 24 (left and right extension boundaries), the upper port of the second plate frame 51 (bottom boundary), and the upper surface of the material supporting plate 52 (material bearing surface), which together enclose an independent space that is "closed up and down and isolated left and right". At this time, the "upper opening" of the sealing frame 24 is blocked by the lower surface of the horizontal plate 22, and the "lower opening" is blocked by the upper port of the second plate frame 51, and both the upper and lower openings are closed by the structural boundary, thereby achieving the function of "isolating the air in the isolation area 6 from the air in the box".

[0040] Among them, the positions between the outer wall of the isolation cover 23 and the upper half of the inner wall of the first plate frame 21, between the outer wall of the sealing frame 24 and the lower half of the inner wall of the first plate frame 21, and between the lower port of the sealing frame 24 and the upper port of the second plate frame 51 are sealed.

[0041] The material is evenly placed on the material supporting plate 52, and the material supported on the material supporting plate 52 is limited by the second plate frame 51 to prevent the material from sliding off the material supporting plate 52 during movement. In addition, during the subsequent pre-freezing of the material, the material supporting plate 52 can slide relative to its own second plate frame 51 to adjust the position of the material supporting plate 52. It should be particularly noted that the material supporting plate 52 moves upward a certain distance relative to its own second plate frame 51, and the material on the material supporting plate 52 does not completely separate from the upper port of the second plate frame 51, and the material on the material supporting plate 52 does not slide out from the gap between the lower port of the first plate frame 21 and the upper port of the second plate frame 51.

[0042] In specific work, when the material needs to be pre-frozen, the isolation cover 23 and the sealing frame 24 on each first plate frame 21 are driven away from each other by the corresponding double-headed screw 251, all the isolation covers 23 move upward, so that the upper surface of the isolation cover 23 is in close contact with the lower side of the material supporting plate 52 above it, and under the drive of the isolation cover 23, the isolation cover 23 and the material supporting plate 52 above it move upward a certain distance together, so that the material on the material supporting plate 52 is close to the first plate frame 21 above it, reducing the distance between the material supporting plate 52 and the first plate frame 22 above it, and also reducing the volume of the isolation area 6, accelerating the temperature transfer. After the first plate frame 21 is cooled by the temperature control cavity 9, the cold energy is transferred to the material supporting plate 52 above it through the first plate frame 21 to directly cool the material supporting plate 52, and then the material supporting plate 52 cools the material below it.

[0043] While the isolation cover 23 moves upward, the sealing frame 24 moves downward, and the sealing frame 24 finally abuts against the upper end face of the plate frame two 51 below, so that the material is in the isolation area 6, the air in the isolation area 6 cannot exchange with the air in the box body, and the limited air in the isolation area 6 can be quickly cooled through the sealing frame 24, the plate frame one 21 and the horizontal plate 22, so that the upper area of the material can quickly generate a low-temperature environment, so that the outer surface of the material not only does not hinder the cooling of the material, but also accelerates the temperature drop of the surface of the material, so that the material can be cooled from multiple directions below and on the surface.

[0044] The specific working principle of the present application when freezing the material is as follows: first, the material is uniformly placed on the material supporting plate 52, and the sliding frame 4 is pushed into the shell 1 as a whole. After positioning, each material plate 5 is accurately positioned between the upper and lower two partitions 2.

[0045] Then, the driving assembly 25 is started, and the isolation cover 23 and the sealing frame 24 on each partition 2 move in opposite directions.

[0046] The sealing frame 24 seals the outer surface of the material downward, specifically, the sealing frame 24 moves downward, and the lower end port abuts against the upper end port of the plate frame two 51 of the material plate 5 below. This makes the sealing frame 24, the plate frame two 51, the material supporting plate 52 in the plate frame two 51, the horizontal plate 22 above, and the inner wall of the plate frame one 21 together form an independent isolation area 6, and seal the material inside. The area is small in volume, limited in air, and isolated from the main environment of the box body.

[0047] The isolation cover 23 lifts the material supporting plate 52 upward, and the sealing frame 24 moves downward while the isolation cover 23 moves upward, the top of the isolation cover 23 abuts against the bottom of the material supporting plate 52 above, and drives the entire material supporting plate 52 to lift a distance. The material is closer to the pre-cooled partition 2 above, shortens the heat transfer distance, further reduces the volume of the isolation area 6, and reduces the amount of air that needs to be cooled.

[0048] In the scheme, through the downward movement of the sealing frame 24 and the combination with the material plate 5, an independent and miniature isolation area 6 is dynamically constructed for each layer of material, and the internal air of the isolation area 6 can also be quickly frozen, so that the sealing area is converted into a freezing cavity to freeze the outer surface of the material, avoiding the problem of prolonged freezing time caused by continuous heat exchange between the surface of the material and the warm air in the shell 1 in the traditional scheme. The isolation cover 23 is combined with the material supporting plate 52 below the material, the cold quantity is transferred to the bottom of the material supporting plate 52, the material is refrigerated, and the isolation cover 23 is combined with the lower side of the material supporting plate 52, which can move the material supporting plate 52 upward, reduce the volume of each corresponding isolation area 6, and accelerate the refrigeration inside the isolation area 6. The material receives cold quantity from the lower side (direct contact conduction) and the upper side and side (cold wall radiation / convection) at the same time, greatly reduces the temperature gradient caused by single-direction heat transfer, so that the whole material can reach the target temperature faster and more uniformly, and the material freezing efficiency is improved.

[0049] It should be particularly pointed out that, compared with the traditional integrated partition plate 2, the partition plate 2 in the scheme is increased, for example, the isolation cover 23, the sealing frame 24 and the driving assembly 25 and the like. The above-mentioned structures are all ordinary and conventional mechanical mechanisms, there is no any high-cost precision component, the additional cost is low, and compared with the freezing drying efficiency improvement in the process of shoveling the material, the additional equipment cost is almost negligible. In summary, the above technical scheme of the present application is a specific improvement based on the above-mentioned prior art and solving the technical problems.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0051] In addition, the terms "first", "second", "one", "two" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0052] In this application, unless otherwise clearly indicated and limited, the terms "setting", "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0053] The embodiments of the specific implementation are the preferred embodiments of the application, not limited by the protection scope of the application, therefore, any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A multi-shelf freeze-dryer shelf structure, characterized by: The application relates to a material conveying device, which comprises a cylindrical shell, the inside of the shell is provided with a plurality of partitions through supports, the partitions are distributed in multiple layers from top to bottom in the shell, each layer is composed of two partitions which are symmetrically distributed left and right, the inside of the shell is provided with two slide rails which are symmetrically arranged from top to bottom, the two slide rails are jointly provided with a sliding frame which is slidably arranged between the two slide rails, the sliding frame is provided with a plurality of material plates which are staggered and distributed above and below the partitions. The partition comprises a first plate frame which is fixedly connected with the inner wall of the shell through supports, a horizontal plate is fixedly arranged at the middle section of the inside of the first plate frame, a downward-opening isolation cover is slidably arranged at the upper side of the first plate frame, a sealing frame which is open at the top and bottom is slidably arranged at the lower side of the first plate frame, a driving assembly is jointly arranged between the isolation cover, the sealing frame and the horizontal plate, and a temperature control assembly is arranged at the upper side of the horizontal plate. The material plate comprises a second plate frame which is connected with the sliding frame, and a material supporting plate is slidably arranged in the second plate frame. The isolation cover moves upwards to contact the material supporting plate above and lift the material on the surface of the material supporting plate together, so that the material supporting plate is close to the first plate frame above, the sealing frame moves downwards to abut against the upper end surface of the second plate frame to form an isolation area to isolate the material on the material supporting plate from the outside of the shell.

2. A multi-shelf freeze-dryer shelf structure according to claim 1, wherein The isolation area is composed of the space jointly formed by the lower port of the first plate frame, the horizontal plate in the first plate frame, the upper port corresponding to the second plate frame, the material plate in the second plate frame and the sealing frame.

3. A multi-shelf freeze-dryer shelf structure according to claim 1, wherein There is a gap of 1-5 cm between the second plate frame and the two first plate frames corresponding above and below.

4. A multi-shelf freeze-dryer shelf structure according to claim 1, wherein The driving assembly comprises four double-head screws which are rotatably arranged at the corresponding corners of the horizontal plate, the upper and lower sections of the double-head screw are provided with opposite thread sections, and two connecting lug plates are threadedly connected on the two thread sections, and the upper and lower connecting lug plates on the same double-head screw are fixedly connected with the corresponding isolation cover and sealing frame.

5. A multi-shelf freeze-dryer shelf structure according to claim 4, wherein A driving motor is fixedly arranged at the position of the horizontal plate above and close to each double-head screw, and the output shaft of the driving motor is jointly connected with the corresponding double-head screw through a speed reducer.

6. A multi-shelf freeze-dryer shelf structure according to claim 1, wherein The temperature control assembly comprises a serpentine heat exchange pipe which is fixedly arranged at the upper side of the horizontal plate, and the two ends of the serpentine heat exchange pipe are connected with external temperature control equipment through connecting pipes penetrating through one side of the corresponding first plate frame.

7. A multi-shelf freeze-dryer shelf structure according to claim 1, wherein Four slide seats which are a group of upper and lower two are fixedly arranged on the sliding frame, rollers are arranged on the slide seats, slide grooves for the movement and guidance of the slide seats are formed on the opposite sides of the upper and lower slide rails, and a locking assembly for locking the lower two slide seats is arranged on the lower slide rail.

8. A multi-shelf freeze-dryer shelf structure according to claim 7, wherein The locking assembly comprises two sliding plates which are slidably arranged on the upper side of the slide rail through guide columns and are symmetrically distributed left and right, two front and rear distributed locking columns are fixedly arranged on the opposite sides of the two sliding plates, the locking columns are movably inserted into the inner wall of the slide groove and the slide seat, U-shaped connecting rods are fixedly arranged on the sides of the two sliding plates which are away from each other, driving rods are rotatably arranged on the left and right sides of the slide rail, two U-shaped fork plates are fixedly arranged on the driving rods, and the U-shaped fork plates are movably sleeved on the surface of the U-shaped connecting rod.

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