CN215490624U

CN215490624U - Vacuum freeze drier

Info

Publication number: CN215490624U
Application number: CN202120335120.2U
Authority: CN
Inventors: 王曙光
Original assignee: Qingdao Flom Technology Co ltd
Current assignee: Qingdao Flom Technology Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-01-11
Anticipated expiration: 2031-02-05

Abstract

The utility model relates to the field of freeze drying equipment, in particular to a vacuum freeze dryer, which comprises a box body, a partition plate mechanism, a material tray mechanism and a material control driving mechanism, wherein the box body is provided with a plurality of partition plates; the middle part of the box body is connected with the partition plate mechanism in a matching way, and the partition plate mechanism partitions the interior of the box body into a freezing area and a drying area; a vacuumizing pipe with a control valve is fixedly connected to the box body and is connected with a vacuum pump through the vacuumizing pipe; the vacuum-pumping pipe is communicated with the freezing area; a refrigerator is arranged in the freezing area; an electric heater is arranged in the drying area; the lower end of the front side of the box body is connected with an opening and closing box door in a sliding fit manner, and is connected with a locking screw rod in a threaded fit manner; the partition plate mechanism arranged in the freezing and drying device can be opened, so that the frozen material in the freezing area can be conveniently controlled to enter the drying area for drying treatment through the material control driving mechanism, manual material taking and discharging are not needed, and the operation is convenient.

Description

Vacuum freeze drier

Technical Field

The utility model relates to the field of freeze drying equipment, in particular to a vacuum freeze dryer.

Background

The vacuum freeze-drying machine is suitable for drying high-grade materials such as medicines, traditional Chinese medicine decoction pieces, organisms, wild vegetables, dehydrated vegetables, foods, fruits and the like, and the freeze-vacuum drying process is free from impurities mixed in the materials and can keep original components and active components of the materials and the shapes of the materials undamaged.

However, when the existing vacuum freeze dryer is used, the convenient switching of the material to be processed between the freezing chamber and the drying chamber cannot be realized, the material after freezing processing needs to be taken out from the freezing chamber and then put into the drying chamber manually, and the operation is complex.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a vacuum freeze dryer which can effectively solve the problems in the prior art.

In order to achieve the purpose, the application provides a vacuum freeze dryer which comprises a box body, a partition plate mechanism, a material tray mechanism and a material control driving mechanism; the middle part of the box body is connected with the partition plate mechanism in a matching way, and the partition plate mechanism partitions the interior of the box body into a freezing area and a drying area; a vacuumizing pipe with a control valve is fixedly connected to the box body and is connected with a vacuum pump through the vacuumizing pipe; the vacuum-pumping pipe is communicated with the freezing area; a refrigerator is arranged in the freezing area; an electric heater is arranged in the drying area; the lower end of the front side of the box body is connected with the opening and closing box door in a sliding fit manner, the lower end of the front side of the box body is connected with a locking screw rod in a threaded fit manner, and the inner side of the locking screw rod is pressed against the outer side surface of the opening and closing box door; the material tray mechanism is in sliding fit with the inner side surface of the box body; the material control driving mechanism is connected to the box body in a matched mode and is connected with the material tray mechanism in a transmission mode so as to drive the material tray mechanism to slide in the vertical direction in the freezing area or the drying area.

Optionally, the material control driving mechanism includes a first servo motor and a first lead screw; the first servo motor is fixed on the box body through a motor base; an output shaft of the first servo motor is in transmission connection with a first lead screw through a coupler; the upper end and the lower end of the first lead screw are respectively in sealing and rotating fit with the top surface and the bottom surface of the box body; the material tray mechanism is matched on the first lead screw through threads.

Optionally, the partition plate mechanism comprises a sliding partition plate, an inclined connecting rod, a movable seat and an electric telescopic rod; the two sliding partition plates are oppositely sealed and slidably matched in the two horizontal slideways in the middle of the box body, the outer ends of the two sliding partition plates are respectively and rotatably connected with one end of an inclined connecting rod, and the other ends of the two inclined connecting rods are rotatably connected with the two ends of the movable seat; the movable seat is fixed at the movable end of the electric telescopic rod; the fixed end of the electric telescopic rod is fixedly connected to the box body; the inner sides of the two sliding partition plates are respectively provided with a semicircular groove, the two semicircular grooves form a lead screw sliding groove, and the first lead screw is rotatably matched with the inner side of the lead screw sliding groove.

Optionally, the material tray mechanism comprises a rectangular material frame, an annular material frame, a central sleeve, an L-shaped connecting rod and a material poking impeller; the rectangular material rack is in sliding fit with the inner side surface of the box body; the annular material rack is connected in a rotating fit manner in a central through hole of the rectangular material rack; the central sleeve is rotationally matched with the inner side of the annular material rack; the central sleeve is matched on the first lead screw through threads; the number of the L-shaped connecting rods is four, and the inner ends of the cross rods of the four L-shaped connecting rods are fixedly connected with the four sides of the central sleeve; the lower ends of the vertical rods of the four L-shaped connecting rods are fixed on the four sides of the top surface of the rectangular material rack; the material poking impellers are arranged in a plurality, the inner ends of the material poking impellers are uniformly fixed on the top surface of the annular material frame in a surrounding mode, and the outer ends of the material poking impellers are in sliding fit with the top surface of the rectangular material frame.

Optionally, a plurality of material through holes are evenly arranged on the material stirring impeller.

Optionally, the vacuum freeze dryer further comprises a stirring driving mechanism; the stirring driving mechanism comprises a second servo motor, a transmission shaft, a driving friction wheel, a driven friction wheel and a bearing frame; the second servo motor is fixed on the box body through a motor base; an output shaft of the second servo motor is in transmission connection with one end of the transmission shaft through a coupler; the middle part of the transmission shaft is hermetically and rotatably connected to the box body, the other end of the transmission shaft is fixedly connected with a driving friction wheel, and the driving friction wheel is positioned in the drying area; the driving friction wheel is in vertical friction transmission connection with the driven friction wheel; the driven friction wheel is rotationally matched on a bearing shaft frame through a wheel shaft, and the bearing shaft frame is fixed on the bottom surface in the box body; the driven friction wheel is in vertical friction transmission connection with the bottom surface of the annular material frame.

Optionally, the bottom of the box body is fixed on the frame.

Optionally, the electric heater adopts DB51-DB-3 electric heating plate.

Optionally, the refrigerator adopts a TEC1-12703 semiconductor refrigerator.

The utility model has the beneficial effects that: the partition plate mechanism arranged in the freezing and drying device can be opened, so that the frozen material in the freezing area can be conveniently controlled to enter the drying area for drying treatment through the material control driving mechanism, manual material taking and discharging are not needed, and the operation is convenient.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a first general schematic diagram provided in accordance with an embodiment of the present invention;

FIG. 2 is a second overall view provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a housing provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of a spacer mechanism provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of a material tray mechanism provided in an embodiment of the present invention;

FIG. 6 is a schematic view of a material control driving mechanism according to an embodiment of the present invention;

fig. 7 is a schematic view of a stirring driving mechanism according to an embodiment of the present invention.

Icon: a box body 1; opening and closing the door 101; a locking screw 102; a partition mechanism 2; a sliding partition 201; a tilt link 202; a movable seat 203; an electric telescopic rod 204; a material tray mechanism 3; a rectangular material rack 301; an annular material rack 302; a central sleeve 303; an L-shaped link 304; a kick-off impeller 305; a material control driving mechanism 4; a first servo motor 401; a first lead screw 402; a stirring driving mechanism 5; a second servo motor 501; a drive shaft 502; a driving friction wheel 503; a driven friction wheel 504; a bearing bracket 505; a frame 6.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for understanding and reading the contents disclosed in the specification, and are not used for limiting the conditions that the present application can implement, so the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present application without affecting the efficacy and the achievable purpose of the present application. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present application, and changes or modifications in the relative relationship may be made without substantial technical changes.

The utility model is described in further detail below with reference to figures 1-7.

The first embodiment is as follows:

as shown in fig. 1-7, the vacuum freeze dryer comprises a box body 1, a partition plate mechanism 2, a material tray mechanism 3 and a material control driving mechanism 4; the middle part of the box body 1 is connected with the partition plate mechanism 2 in a matching way, and the partition plate mechanism 2 divides the interior of the box body 1 into a freezing area and a drying area; a vacuumizing tube with a control valve is fixedly connected to the box body 1 and is connected with a vacuum pump through the vacuumizing tube; the vacuum-pumping pipe is communicated with the freezing area; a refrigerator is arranged in the freezing area; an electric heater is arranged in the drying area; the lower end of the front side of the box body 1 is connected with an opening and closing box door 101 in a sliding fit manner, the lower end of the front side of the box body 1 is connected with a locking screw 102 in a threaded fit manner, and the inner side of the locking screw 102 is pressed against the outer side surface of the opening and closing box door 101; the material tray mechanism 3 is in sliding fit with the inner side surface of the box body 1; the material control driving mechanism 4 is connected to the box body 1 in a matched mode, and the material control driving mechanism 4 is connected with the material tray mechanism 3 in a transmission mode so as to drive the material tray mechanism 3 to slide in the vertical direction in the freezing area or the drying area. The outer side surface of the opening and closing door 101 is provided with a locking jack, when the opening and closing door 101 is closed on the box body 1, the inner side of the locking screw 102 is inserted into the locking jack of the opening and closing door 101 to fix the opening and closing door 101.

When the vacuum freeze dryer is used, firstly, the opening and closing box door 101 is opened, then the material to be treated is placed on the material tray mechanism 3, then the opening and closing box door 101 is closed, the partition plate mechanism 2 is opened, the material on the material tray mechanism 3 is controlled by the material control driving mechanism 4 which is started by electricity to enter the freezing area in the box body 1, then the partition plate mechanism 2 is closed, the freezing area is separated from the drying area, the vacuum pump which is communicated with the box body 1 through the vacuum pumping pipe is opened, during the freezing process of the material by the refrigerator in the freezing area, part of moisture in the material is taken away by the vacuum pump, and when the material is frozen, the moisture contained in certain molecules is discharged to the surface of the material to be frozen, after the freezing requirement is met, the partition plate mechanism 2 is controlled to be opened, the material on the material tray mechanism 3 is controlled by the material control driving mechanism 4 to enter the drying area in the box body 1, then closing the partition board mechanism 2, and carrying out heating and drying treatment through an electric heater in a drying area to meet the requirement of freeze drying of the materials; and finally, opening the opening and closing box door 101 to take out the materials.

The second embodiment is as follows:

as shown in fig. 1 to 7, the material control driving mechanism 4 includes a first servo motor 401 and a first lead screw 402; the first servo motor 401 is fixed on the box body 1 through a motor base; an output shaft of the first servo motor 401 is in transmission connection with a first lead screw 402 through a coupler; the upper end and the lower end of the first lead screw 402 are respectively in sealing and rotating fit with the top surface and the bottom surface of the box body 1; the material tray mechanism 3 is screwed on the first lead screw 402. After being started, a first servo motor 401 in the material control driving mechanism 4 can drive a first lead screw 402 to rotate, and when the first lead screw 402 rotates, the material tray mechanism 3 can be driven to slide up and down in the box body 1, so that the materials are transferred in a freezing area and a drying area.

The third concrete implementation mode:

as shown in fig. 1-7, the partition plate mechanism 2 comprises a sliding partition plate 201, an inclined connecting rod 202, a movable seat 203 and an electric telescopic rod 204; two sliding partition plates 201 are arranged, the two sliding partition plates 201 are in relative sealing sliding fit in two horizontal slideways in the middle of the box body 1, the outer ends of the two sliding partition plates 201 are respectively and rotatably connected with one end of an inclined connecting rod 202, and the other ends of the two inclined connecting rods 202 are rotatably connected with two ends of a movable seat 203; the movable seat 203 is fixed at the movable end of the electric telescopic rod 204; the fixed end of the electric telescopic rod 204 is fixedly connected to the box body 1; the inner sides of the two sliding partition plates 201 are respectively provided with a semicircular groove, the two semicircular grooves form a screw rod sliding groove, and the first screw rod 402 is rotatably matched with the inner side of the screw rod sliding groove. The partition plate mechanism 2 is used for dividing the interior of the box body 1 into a freezing area and a drying area, is convenient to open and is easy for transferring materials in the freezing area and the drying area; when the refrigerator is used, the electric telescopic rod 204 can drive the movable seat 203 to move up and down after being started, and the two sliding partition boards 201 can be driven to slide relatively or deviate from each other in the two horizontal slideways in the middle of the refrigerator body 1 through the two inclined connecting rods 202 in the moving process of the movable seat 203, so that the communication or the interval between the freezing area and the drying area is realized; the inner sides of the two sliding partition plates 201 are respectively provided with a semicircular groove, the two semicircular grooves form a lead screw sliding groove, and the first lead screw 402 is in running fit with the inner side of the lead screw sliding groove, so that the rotation of the first lead screw 402 is not influenced.

The fourth concrete implementation mode:

as shown in fig. 1 to 7, the material tray mechanism 3 includes a rectangular material rack 301, an annular material rack 302, a central sleeve 303, an L-shaped connecting rod 304 and a material poking impeller 305; the rectangular material rack 301 is in sliding fit with the inner side surface of the box body 1; the annular material rack 302 is connected in a rotating fit manner in a central through hole of the rectangular material rack 301; the center sleeve 303 is rotationally fitted inside the ring rack 302; the central sleeve 303 is in threaded fit with the first lead screw 402; the number of the L-shaped connecting rods 304 is four, and the inner ends of the cross rods of the four L-shaped connecting rods 304 are fixedly connected with the four sides of the central sleeve 303; the lower ends of the vertical rods of the four L-shaped connecting rods 304 are fixed to the four sides of the top surface of the rectangular material rack 301; the plurality of material poking impellers 305 are arranged, the inner ends of the plurality of material poking impellers 305 are uniformly fixed on the top surface of the annular material rack 302 in a surrounding mode, and the outer ends of the plurality of material poking impellers 305 are in sliding fit with the top surface of the rectangular material rack 301. When the material tray mechanism 3 is used, the central sleeve 303 can be driven by the first lead screw 402 to drive the rectangular material rack 301 to slide in the freezing area and the drying area of the box body 1 through the four L-shaped connecting rods 304; the annular material frame 302 and the material poking impeller 305 are arranged, so that materials laid on the rectangular material frame 301 can be stirred properly and laid uniformly, and the freeze drying effect of the materials can be improved.

A plurality of material through holes are uniformly formed in the material stirring impeller 305.

The vacuum freeze dryer also comprises a stirring driving mechanism 5; the stirring driving mechanism 5 comprises a second servo motor 501, a transmission shaft 502, a driving friction wheel 503, a driven friction wheel 504 and a bearing bracket 505; the second servo motor 501 is fixed on the box body 1 through a motor base; an output shaft of the second servo motor 501 is in transmission connection with one end of a transmission shaft 502 through a coupler; the middle part of the transmission shaft 502 is hermetically and rotatably connected to the box body 1, the other end of the transmission shaft 502 is fixedly connected with a driving friction wheel 503, and the driving friction wheel 503 is positioned in the drying area; the driving friction wheel 503 is vertically connected with the driven friction wheel 504 in a friction transmission manner; the driven friction wheel 504 is rotationally matched on a bearing bracket 505 through a wheel shaft, and the bearing bracket 505 is fixed on the bottom surface inside the box body 1; the driven friction wheel 504 is vertically connected with the bottom surface of the ring material rack 302 in a friction transmission manner.

The second servo motor 501 in the stirring driving mechanism 5 can drive the transmission shaft 502 to rotate after being started, the transmission shaft 502 can drive the driven friction wheel 504 to rotate through the driving friction wheel 503 when rotating, the annular material rack 302 in the material tray mechanism 3 can drive the annular material rack 302 to rotate when moving downwards under the control of the first lead screw 402 to be in contact with the driven friction wheel 504, and the annular material rack 302 drives the plurality of stirring impellers 305 to stir materials laid on the rectangular material rack 301, so that the materials are turned over, and the material drying effect is favorably improved.

The bottom of the box body 1 is fixed on the frame 6.

The electric heater adopts DB51-DB-3 electric heating plates.

The refrigerator adopts a TEC1-12703 semiconductor refrigerator.

The principle is as follows: when the vacuum freeze dryer is used, firstly, the opening and closing box door 101 is opened, then the material to be treated is placed on the material tray mechanism 3, then the opening and closing box door 101 is closed, the partition plate mechanism 2 is opened, the material on the material tray mechanism 3 is controlled by the material control driving mechanism 4 which is started by electricity to enter the freezing area in the box body 1, then the partition plate mechanism 2 is closed, the freezing area is separated from the drying area, the vacuum pump which is communicated with the box body 1 through the vacuum pumping pipe is opened, during the freezing process of the material by the refrigerator in the freezing area, part of moisture in the material is taken away by the vacuum pump, and when the material is frozen, the moisture contained in certain molecules is discharged to the surface of the material to be frozen, after the freezing requirement is met, the partition plate mechanism 2 is controlled to be opened, the material on the material tray mechanism 3 is controlled by the material control driving mechanism 4 to enter the drying area in the box body 1, then closing the partition board mechanism 2, and carrying out heating and drying treatment through an electric heater in a drying area to meet the requirement of freeze drying of the materials; and finally, opening the opening and closing box door 101 to take out the materials.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. The vacuum freeze dryer comprises a box body (1), a clapboard mechanism (2), a material tray mechanism (3) and a material control driving mechanism (4); the method is characterized in that: the middle part of the box body (1) is connected with the clapboard mechanism (2) in a matching way, and the clapboard mechanism (2) divides the interior of the box body (1) into a freezing area and a drying area; a vacuumizing tube with a control valve is fixedly connected to the box body (1) and is connected with a vacuum pump through the vacuumizing tube; the vacuum-pumping pipe is communicated with the freezing area; a refrigerator is arranged in the freezing area; an electric heater is arranged in the drying area; the lower end of the front side of the box body (1) is connected with an opening and closing box door (101) in a sliding fit manner, the lower end of the front side of the box body (1) is connected with a locking screw rod (102) in a threaded fit manner, and the inner side of the locking screw rod (102) is pressed against the outer side surface of the opening and closing box door (101); the material tray mechanism (3) is in sliding fit with the inner side surface of the box body (1); the material control driving mechanism (4) is connected to the box body (1) in a matched mode, the material control driving mechanism (4) is connected to the material tray mechanism (3) in a transmission mode, and therefore the material tray mechanism (3) is driven to slide in the vertical direction in a freezing area or a drying area.

2. The vacuum freeze dryer of claim 1, wherein: the material control driving mechanism (4) comprises a first servo motor (401) and a first lead screw (402); the first servo motor (401) is fixed on the box body (1) through a motor base; an output shaft of the first servo motor (401) is in transmission connection with a first lead screw (402) through a coupler; the upper end and the lower end of the first lead screw (402) are respectively in sealing and rotating fit with the top surface and the bottom surface of the box body (1); the material tray mechanism (3) is matched on the first lead screw (402) through threads.

3. The vacuum freeze dryer of claim 2, wherein: the partition plate mechanism (2) comprises a sliding partition plate (201), an inclined connecting rod (202), a movable seat (203) and an electric telescopic rod (204); two sliding partition plates (201) are arranged, the two sliding partition plates (201) are in relative sealing sliding fit in two horizontal slideways in the middle of the box body (1), the outer ends of the two sliding partition plates (201) are respectively and rotatably connected with one end of an inclined connecting rod (202), and the other ends of the two inclined connecting rods (202) are rotatably connected with two ends of a movable seat (203); the movable seat (203) is fixed at the movable end of the electric telescopic rod (204); the fixed end of the electric telescopic rod (204) is fixedly connected to the box body (1); the inner sides of the two sliding partition plates (201) are respectively provided with a semicircular groove, the two semicircular grooves form a screw rod sliding groove, and the first screw rod (402) is rotatably matched with the inner side of the screw rod sliding groove.

4. The vacuum freeze dryer of claim 2, wherein: the material tray mechanism (3) comprises a rectangular material frame (301), an annular material frame (302), a central sleeve (303), an L-shaped connecting rod (304) and a material shifting impeller (305); the rectangular material rack (301) is in sliding fit with the inner side face of the box body (1); the annular material rack (302) is connected in a rotating fit manner in a central through hole of the rectangular material rack (301); the central sleeve (303) is rotationally matched with the inner side of the annular material rack (302); the central sleeve (303) is matched on the first lead screw (402) through threads; the number of the L-shaped connecting rods (304) is four, and the inner ends of the cross rods of the four L-shaped connecting rods (304) are fixedly connected with the four sides of the central sleeve (303); the lower ends of the vertical rods of the four L-shaped connecting rods (304) are fixed on the four sides of the top surface of the rectangular material rack (301); the material poking impellers (305) are multiple, the inner ends of the material poking impellers (305) are uniformly fixed on the top surface of the annular material frame (302) in a surrounding mode, and the outer ends of the material poking impellers (305) are in sliding fit with the top surface of the rectangular material frame (301).

5. The vacuum freeze dryer of claim 4, wherein: a plurality of material through holes are uniformly formed in the material stirring impeller (305).

6. The vacuum freeze dryer of claim 4, wherein; the stirring device also comprises a stirring driving mechanism (5); the stirring driving mechanism (5) comprises a second servo motor (501), a transmission shaft (502), a driving friction wheel (503), a driven friction wheel (504) and a bearing bracket (505); the second servo motor (501) is fixed on the box body (1) through a motor base; an output shaft of the second servo motor (501) is in transmission connection with one end of the transmission shaft (502) through a coupler; the middle part of the transmission shaft (502) is hermetically and rotatably connected to the box body (1), the other end of the transmission shaft (502) is fixedly connected with a driving friction wheel (503), and the driving friction wheel (503) is positioned in the drying area; the driving friction wheel (503) is in vertical friction transmission connection with a driven friction wheel (504); the driven friction wheel (504) is rotationally matched on a bearing frame (505) through a wheel shaft, and the bearing frame (505) is fixed on the bottom surface inside the box body (1); the driven friction wheel (504) is vertically connected with the bottom surface of the annular material rack (302) in a friction transmission manner.

7. The vacuum freeze dryer of claim 1, wherein: the bottom of the box body (1) is fixed on the frame (6).

8. The vacuum freeze dryer of claim 1, wherein: the electric heater adopts DB51-DB-3 electric heating plates.

9. The vacuum freeze dryer of claim 1, wherein: the refrigerator adopts a TEC1-12703 semiconductor refrigerator.