Portable vacuum drying oven used under field conditions

Abstract

The invention discloses a portable vacuum drying box used under field conditions, which comprises a vacuum drying box body, the top of the vacuum drying box body is provided with a mounting cover, the side wall of the vacuum drying box body is provided with a material placing and taking auxiliary mechanism, and the material placing and taking auxiliary mechanism is connected with the mounting cover. A drying cavity space adjusting mechanism used for adjusting the space size of the drying cavity is arranged on the side, located in the vacuum drying box body, of the mounting cover, a fan is fixedly mounted at the bottom of the inner wall of the vacuum drying box body, the air inlet end of the fan communicates with the outside, and the air outlet end of the fan faces the interior of the vacuum drying box body. Supporting rods are fixedly connected to the four corners of the bottom of the inner wall of the vacuum drying box body, through arrangement of a material placing and taking auxiliary mechanism, lifting of a mounting cover can be controlled, lifting of a placing net plate can be driven through lifting of the mounting cover, and therefore objects can be conveniently placed on and taken out of the placing net plate; and the situation that people are scalded when opening the box door manually and stretching into the box to take articles in the prior art is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum drying ovens, in particular to a portable vacuum drying oven used in field conditions. Background Art

[0002] Vacuum drying, also known as analytical drying, is a drying method that places the material under negative pressure conditions and appropriately heats it to the boiling point under negative pressure or cools it down to the melting point after solidifying it. Vacuum drying technology has been widely used in the production of health foods, especially in the drying of extracts of natural products, because many effective ingredients in natural products are not resistant to high temperatures and vacuum drying is widely used. Vacuum drying technology is also called reduced pressure drying. It is a method of drying by removing air from a closed container and reducing pressure.

[0003] A vacuum drying oven is needed under field conditions. Articles can be quickly dried and preserved through the vacuum drying oven. The existing vacuum drying oven is large in size and inconvenient for field use. The existing vacuum drying oven is usually provided with a door, and articles are placed or taken out by opening the door. However, the temperature inside is high after the door is opened, which poses certain safety hazards. In addition, the space size of the internal drying chamber of the existing vacuum drying oven is fixed, and it takes a long time to dry smaller articles. Therefore, we propose a portable vacuum drying oven for field conditions. Summary of the invention

[0004] The object of the present invention is to provide a portable vacuum drying box for use in field conditions to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a portable vacuum drying box for outdoor conditions, comprising a vacuum drying box body, a mounting cover is installed on the top of the vacuum drying box body, a material placement and taking auxiliary mechanism is arranged on the side wall of the vacuum drying box body, and the material placement and taking auxiliary mechanism is connected to the mounting cover, a drying chamber space adjustment mechanism for adjusting the size of the drying chamber space is arranged on one side of the mounting cover located inside the vacuum drying box body, a fan is fixedly installed at the bottom of the inner wall of the vacuum drying box body, and the air inlet end of the fan is connected to the outside, and the air outlet end of the fan is arranged toward the inside of the vacuum drying box body, support rods are fixedly connected to the four corners of the bottom of the inner wall of the vacuum drying box body, and a mounting frame is fixedly connected to the tops of the four support rods, the mounting frame is located directly above the fan, heating rods are equidistantly arranged in the mounting frame, a temperature sensor, a pressure sensor and a humidity sensor are sequentially installed in the drying chamber of the vacuum drying box body, and a pressure relief valve is installed at the bottom end of the side wall of the vacuum drying box body.

[0006] Preferably, the drying chamber space adjustment mechanism comprises a placement screen plate, an adjustment plate, a connecting rod, a threaded rod, a driven gear, a driving gear, a motor seat and a driving motor; the placement screen plate is slidably connected inside the mounting cover; the placement screen plate and the mounting cover are symmetrically fixedly connected with a connecting rod; a threaded rod is arranged between the mounting cover and the placement screen plate, and both ends of the threaded rod are rotatably connected to the mounting cover and the placement screen plate through bearings respectively; the placement screen plate is located directly above the heating rod; an adjustment plate is slidably connected above the placement screen plate in the mounting cover; the temperature sensor, the pressure sensor and the humidity sensor are all fixedly mounted on the bottom of the adjustment plate; a vertical threaded hole is provided at the top center of the adjustment plate; the adjustment plate and the threaded rod are threadedly connected; the top of the threaded rod passes through the mounting cover and is fixedly connected with a driven gear; a motor seat is fixedly mounted on the top of the mounting cover; a driving motor is fixedly mounted in the motor seat; the output shaft end of the driving motor is fixedly connected with a driving gear, and the driving gear is meshingly connected with the driven gear.

[0007] Preferably, the material placement and taking auxiliary mechanism includes a support plate, a fixed plate, a lifting screw, a lifting plate, a mounting plate, a fixing rod and a servo motor. The bottom and top ends of the side walls of the vacuum drying box are respectively fixedly connected to the support plate and the fixed plate, and a lifting screw is rotatably connected between the support plate and the fixed plate. The side walls of the vacuum drying box are slidably connected to the lifting plate, and the lifting plate is threadedly connected to the outside of the lifting screw. The side walls of the mounting cover are integrally connected to the mounting plate. The four bottom corners of the mounting plate are fixedly connected to limit rods, and the ends of the limit rods are fixedly connected to the lifting plate. A servo motor is fixedly installed on the bottom of the support plate, and the end of the output shaft of the servo motor passes through the support plate and is fixedly connected to the lifting screw.

[0008] Preferably, a groove is formed on the outside of the adjustment plate, and a sealing ring is arranged in the groove, and the sealing ring is in contact with the inner wall of the vacuum drying box.

[0009] Preferably, the top of the support plate is symmetrically fixedly connected to a limiting rod, and the top of the limiting rod slides through the lifting plate and is fixedly connected to the fixing plate.

[0010] Preferably, the length of the fixing plate is smaller than the distance between the fixing rods at both ends of the top of the lifting plate.

[0011] Preferably, the vacuum drying box is symmetrically provided with universal wheels at the bottom end of the vertical surface of the support plate, and a pull rod is provided on one side of the universal wheels of the vacuum drying box.

[0012] Preferably, shoulder straps are symmetrically arranged on one side of the vacuum drying box away from the pull rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can control the lifting of the installation cover by setting up the material placement and taking auxiliary mechanism. The lifting of the installation cover can drive the lifting of the placement mesh plate, thereby facilitating the placement and taking of items on the placement mesh plate, avoiding the situation in which people manually open the box door and reach into the box to take items and get burned.

[0015] 2. The present invention can control the lifting and lowering of the adjustment plate inside the vacuum drying box by setting a drying chamber space adjustment mechanism, and the area below the adjustment plate inside the vacuum drying box forms a vacuum drying chamber. When the height of the adjustment plate is lowered, the volume of the vacuum chamber can be set small, so that smaller items can be dried efficiently.

[0016] 3. The present invention uses a universal wheel and a pull rod to coordinately set the vacuum drying box. When carrying, the vacuum drying box can be tilted so that the universal wheel contacts the ground, and the pull rod is pulled to move the vacuum drying box, which is convenient for carrying the vacuum drying box outdoors. By setting a shoulder strap on the vacuum drying box, the vacuum drying box can be carried on the user's back when walking outdoors, which greatly facilitates carrying the vacuum drying box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of the vacuum drying box of the present invention;

[0019] Figure 3 It is a schematic diagram of the connection structure between the mounting cover and the adjustment plate of the present invention;

[0020] Figure 4 It is a schematic diagram of the installation structure of the fan of the present invention;

[0021] Figure 5 It is a schematic diagram of the installation structure of the heating rod and the installation frame of the present invention;

[0022] Figure 6 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the adjustment plate of the present invention after adjustment.

[0024] In the figure: 1. Vacuum drying box; 2. Mounting cover; 3. Drying chamber space adjustment mechanism; 4. Material placement and taking auxiliary mechanism; 5. Universal wheel; 6. Pull rod; 7. Shoulder strap; 8. Support plate; 9. Fixed plate; 10. Lifting screw rod; 11. Lifting plate; 12. Mounting plate; 13. Fixed rod; 14. Servo motor; 15. Fan; 16. Mounting frame; 17. Heating rod; 18. Placement screen; 19. Adjustment plate; 20. Temperature sensor; 21. Pressure sensor; 22. Humidity sensor; 24. Sealing ring; 25. Connecting rod; 26. Threaded rod; 27. Driven gear; 28. Driving gear; 29. ​​Motor seat; 30. Driving motor; 31. Limit rod; 32. Pressure relief valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-7 The present invention provides a technical solution: a portable vacuum drying box for use in field conditions, comprising a vacuum drying box body 1, a mounting cover 2 is installed on the top of the vacuum drying box body 1, a material placement and taking auxiliary mechanism 4 is provided on the side wall of the vacuum drying box body 1, and the material placement and taking auxiliary mechanism 4 is connected to the mounting cover 2.

[0027] It should be noted that the lifting and lowering of the installation cover 2 can be controlled by the material placement and taking auxiliary mechanism 4, so that the installation cover 2 is convenient for opening and closing the vacuum drying box 1.

[0028] The installation cover 2 is located on one side of the vacuum drying box 1 and is provided with a drying chamber space adjustment mechanism 3 for adjusting the size of the drying chamber space. A fan 15 is fixedly installed at the bottom of the inner wall of the vacuum drying box 1, and the air inlet end of the fan 15 is connected to the outside, and the air outlet end of the fan 15 is arranged toward the inside of the vacuum drying box 1. The four corners of the bottom of the inner wall of the vacuum drying box 1 are fixedly connected with support rods, and the tops of the four support rods are fixedly connected with an installation frame 16, and the installation frame 16 is located directly above the fan 15. Heating rods 17 are equidistantly arranged in the installation frame 16.

[0029] It should be noted that four support rods are equidistantly fixedly connected to the bottom of the inner wall of the vacuum drying box 1, a mounting frame 16 is fixed on the top of the four support rods, and the fan 15 is fixedly installed between the four support rods. The fan 15 is located directly below the mounting frame 16, and a plurality of heating rods 17 are equidistantly installed on the mounting frame 16. A controller is provided on the vacuum drying box 1, which can control the operation of the heating rods 17 and the fan 15, so that hot air can be blown into the vacuum chamber to vacuum dry the objects.

[0030] The drying chamber of the vacuum drying box 1 is provided with a temperature sensor 20, a pressure sensor 21 and a humidity sensor 22 in sequence, and a pressure relief valve 32 is provided at the bottom end of the side wall of the vacuum drying box 1.

[0031] It should be noted that when the present invention is in use, the vacuum drying box 1 can be tilted so that the universal wheels 5 are in contact with the ground, and the drying box can be pulled and carried by pulling the pull rod 6, or the vacuum drying box 1 can be carried on the back by the shoulder strap 7. When drying, the control system provided in the device controls the servo motor 14 to rotate the lifting screw 10, and the lifting plate 11 is raised by the threaded connection between the lifting plate 11 and the lifting screw 10. The limit rod 31 acts on the box to raise the height of the installation cover 2. During the raising process of the installation cover 2, the position of the placement screen 18 inside the vacuum drying box 1 is driven to rise. When the lifting plate 11 is raised to the fixed plate 9, the placement screen 18 is located at the top of the vacuum drying box 1, and the objects to be dried can be directly placed on the placement screen 18. Similarly, the dried objects can also be taken After the items are placed, the servo motor 14 works to control the lifting screw 10 to rotate in the opposite direction, so that the placement screen 18 returns to its position, and the size of the drying chamber is adjusted according to the size of the items. During adjustment, the driving motor 30 is controlled to work to rotate the active gear 28, and the adjustment plate 19 is moved down through the meshing connection of the active gear 28 and the driven gear 27, and the area between the bottom of the adjustment plate 19 and the top of the placement screen 18 forms a vacuum chamber. The temperature, pressure and humidity inside the vacuum drying box 1 can be controlled by the temperature sensor 20, the pressure sensor 21, and the humidity sensor 22 to achieve the best drying effect. After drying is completed, the installation cover 2 is continued to be controlled to rise, so that the placement screen 18 is raised to the top of the vacuum drying box 1, so that the items can be exposed to the outside, so that the items can be cooled faster, and it is convenient to take the items.

[0032] The drying chamber space adjustment mechanism 3 includes a placement screen plate 18, an adjustment plate 19, a connecting rod 25, a threaded rod 26, a driven gear 27, a driving gear 28, a motor seat 29 and a driving motor 30. The placement screen plate 18 is slidably connected inside the installation cover 2. The placement screen plate 18 and the installation cover 2 are symmetrically fixedly connected with the connecting rod 25. A threaded rod 26 is arranged between the installation cover 2 and the placement screen plate 18, and both ends of the threaded rod 26 are rotatably connected to the installation cover 2 and the placement screen plate 18 through bearings respectively. The placement screen plate 18 is located directly above the heating rod 17.

[0033] It should be noted that the placing mesh plate 18 can be used to place the items to be dried, and the placing mesh plate 18 and the mounting cover 2 are fixedly connected by two connecting rods 25. When the mounting cover 2 is controlled to rise, the mounting cover 2 pulls the placing mesh plate 18 to rise, and finally the placing mesh plate 18 is placed at the top of the vacuum drying box 1. At this time, the items can be directly placed on the placing mesh plate 18. When the height of the mounting cover 2 is controlled to drop, the placing mesh plate 18 is replaced at the bottom of the vacuum drying box 1, and the placing mesh plate 18 is located directly above the heating rod 17. Therefore, in the vacuum drying chamber, the items on the placing mesh plate 18 can be vacuum dried through the cooperation of the fan 15 and the heating rod 17.

[0034] An adjusting plate 19 is slidably connected to the mounting cover 2 above the mesh plate 18. The temperature sensor 20, the pressure sensor 21 and the humidity sensor 22 are all fixedly mounted on the bottom of the adjusting plate 19. A vertical threaded hole is provided at the top center of the adjusting plate 19. The adjusting plate 19 is threadedly connected to a threaded rod 26. The top of the threaded rod 26 passes through the mounting cover 2 and is fixedly connected to a driven gear 27. A motor seat 29 is fixedly mounted on the top of the mounting cover 2, and a driving motor 30 is fixedly mounted in the motor seat 29. A driving gear 28 is fixedly connected to the end of the output shaft of the driving motor 30, and the driving gear 28 is meshed with the driven gear 27.

[0035] It should be noted that when the driving motor 30 is controlled by the device controller, the driving gear 28 is driven to rotate, and the threaded rod 26 is rotated through the meshing connection between the driving gear 28 and the driven gear 27. The adjusting plate 19 is threadedly connected to the threaded rod 26 to realize the lifting and lowering of the adjusting plate 19, and the area below the adjusting plate 19 is the vacuum drying chamber. When the adjusting plate 19 descends, the volume of the area below the vacuum drying box 1 becomes smaller, so that the items can be quickly dried in a smaller space.

[0036] The material placement and taking auxiliary mechanism 4 includes a support plate 8, a fixed plate 9, a lifting screw 10, a lifting plate 11, a mounting plate 12, a fixing rod 13 and a servo motor 14. The bottom and top ends of the side walls of the vacuum drying box 1 are respectively fixedly connected with the support plate 8 and the fixed plate 9, and the lifting screw 10 is rotatably connected between the support plate 8 and the fixed plate 9. The side wall of the vacuum drying box 1 is slidably connected with the lifting plate 11, and the lifting plate 11 is threadedly connected to the outside of the lifting screw 10. The side wall of the mounting cover 2 is integrally connected with the mounting plate 12, and the four corners of the bottom of the mounting plate 12 are fixedly connected with the limiting rod 31, and the end of the limiting rod 31 is fixedly connected to the lifting plate 11. The bottom of the support plate 8 is fixedly installed with a servo motor 14, and the output shaft end of the servo motor 14 passes through the support plate 8 and is fixedly connected to the lifting screw 10.

[0037] It should be noted that the lifting screw 10 is rotated by controlling the servo motor 14, and the lifting plate 11 is raised through the threaded connection between the lifting plate 11 and the lifting screw 10. The limit rod 31 acts on the mounting cover 2 to raise its height. During the raising process of the mounting cover 2, the placement screen 18 inside the vacuum drying box 1 is driven to rise. When the lifting plate 11 rises to the fixed plate 9, the placement screen 18 is located at the top of the vacuum drying box 1. The objects to be dried can be placed directly on the placement screen 18. Similarly, the dried objects can also be taken. After placing the objects, the servo motor 14 works to control the lifting screw 10 to rotate in the opposite direction, so that the placement screen 18 returns to its position.

[0038] The adjusting plate 19 has a groove formed on its exterior, and a sealing ring 24 is disposed in the groove. The sealing ring 24 contacts the inner wall of the vacuum drying box 1 .

[0039] It should be noted that interconnected grooves are provided around the adjustment plate 19, and a sealing ring 24 is provided in the groove. The adjustment plate 19 is located inside the vacuum drying box 1, and the four side walls of the adjustment plate 19 are fitted and connected to the inner wall of the vacuum drying box 1. The sealing ring 24 has a good sealing effect and ensures the sealing.

[0040] The top of the support plate 8 is symmetrically fixedly connected to the limiting rod 31 , and the top of the limiting rod 31 slides through the lifting plate 11 and is fixedly connected to the fixing plate 9 .

[0041] It should be noted that, when the lifting plate 11 is lifted or lowered, the two ends of the lifting plate 11 are slidably arranged outside the two limit rods 31 , so that the lifting plate 11 is lifted or lowered more smoothly, thereby ensuring the smooth lifting or lowering of the installation cover 2 .

[0042] The length of the fixing plate 9 is smaller than the distance between the fixing rods 13 at the two ends of the top of the lifting plate 11 .

[0043] It should be noted that the length of the fixed plate 9 is set to be smaller than the distance between the fixed rods 13 at the top ends of the lifting plate 11, so that the lifting plate 11 can be lifted and lowered smoothly. When the lifting plate 11 is raised to the position of the fixed plate 9, the fixed plate 9 can play a blocking role.

[0044] The vacuum drying box 1 is symmetrically provided with universal wheels 5 at the bottom end of the vertical surface of the support plate 8 , and a pull rod 6 is provided at one side of the universal wheels 5 .

[0045] It should be noted that, through the coordinated arrangement of the universal wheels 5 and the pull rod 6, the vacuum drying box 1 can be tilted when carried, so that the universal wheels 5 are in contact with the ground, and the pull rod 6 is pulled to move the vacuum drying box 1, which is convenient for carrying the vacuum drying box 1 in the wild.

[0046] A shoulder strap 7 is symmetrically provided on one side of the vacuum drying box 1 away from the pull rod 6 .

[0047] It should be noted that, by providing the shoulder strap 7 on the vacuum drying box 1 , the vacuum drying box 1 can be carried on the user's back by the shoulder strap 7 when walking outdoors, which greatly facilitates carrying the vacuum drying box 1 .

[0048] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0050] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable vacuum drying box for use in the field, comprising a vacuum drying box body (1), characterized in that: The top of the vacuum drying box (1) is provided with a mounting cover (2), the side wall of the vacuum drying box (1) is provided with a material placement and taking auxiliary mechanism (4), and the material placement and taking auxiliary mechanism (4) is connected to the mounting cover (2), and a drying chamber space adjustment mechanism (3) for adjusting the size of the drying chamber space is provided on one side of the mounting cover (2) located inside the vacuum drying box (1), and a fan (15) is fixedly installed at the bottom of the inner wall of the vacuum drying box (1), and the air inlet end of the fan (15) is connected to the outside, and the air outlet end of the fan (15) is connected to the outside. The vacuum drying box (1) is arranged toward the inside of the vacuum drying box (1), the bottom four corners of the inner wall of the vacuum drying box (1) are fixedly connected to support rods, and the tops of the four support rods are fixedly connected to a mounting frame (16), the mounting frame (16) is located directly above the fan (15), and heating rods (17) are equidistantly arranged in the mounting frame (16), the drying chamber of the vacuum drying box (1) is sequentially installed with a temperature sensor (20), a pressure sensor (21) and a humidity sensor (22), and the bottom end of the side wall of the vacuum drying box (1) is installed with a pressure relief valve (32).

2. A portable vacuum drying oven for use in the field according to claim 1, characterized in that: The drying chamber space adjustment mechanism (3) comprises a placement screen plate (18), an adjustment plate (19), a connecting rod (25), a threaded rod (26), a driven gear (27), a driving gear (28), a motor seat (29) and a driving motor (30); the placement screen plate (18) is slidably connected inside the installation cover (2); the placement screen plate (18) and the installation cover (2) are symmetrically fixedly connected with the connecting rod (25); a threaded rod (26) is provided between the installation cover (2) and the placement screen plate (18); and the two ends of the threaded rod (26) are rotatably connected to the installation cover (2) and the placement screen plate (18) through bearings, respectively; the placement screen plate (18) is located directly above the heating rod (17); the placement screen plate (18) is located inside the installation cover (2) and the placement screen plate (18) is located at the bottom of the installation cover (2). An adjusting plate (19) is slidably connected to the top of the adjusting plate (18); the temperature sensor (20), the pressure sensor (21) and the humidity sensor (22) are all fixedly mounted on the bottom of the adjusting plate (19); a vertical threaded hole is provided at the top center of the adjusting plate (19); the adjusting plate (19) and the threaded rod (26) are threadedly connected; the top of the threaded rod (26) passes through the mounting cover (2) and is fixedly connected to a driven gear (27); a motor seat (29) is fixedly mounted on the top of the mounting cover (2); a driving motor (30) is fixedly mounted in the motor seat (29); a driving gear (28) is fixedly connected to the end of the output shaft of the driving motor (30); and the driving gear (28) is meshedly connected to the driven gear (27).

3. A portable vacuum drying oven for outdoor use according to claim 1, characterized in that: The material placement and taking auxiliary mechanism (4) comprises a support plate (8), a fixed plate (9), a lifting screw (10), a lifting plate (11), a mounting plate (12), a fixing rod (13) and a servo motor (14); the bottom end and the top end of the side wall of the vacuum drying box (1) are respectively fixedly connected to the support plate (8) and the fixing plate (9); the lifting screw (10) is rotatably connected between the support plate (8) and the fixing plate (9); the side wall of the vacuum drying box (1) is slidably connected to the lifting plate (11) 11), and the lifting plate (11) is threadedly connected to the outer side of the lifting screw (10), the side wall of the mounting cover (2) is integrally connected with the mounting plate (12), the four corners of the bottom of the mounting plate (12) are fixedly connected with the limit rod (31), and the end of the limit rod (31) is fixedly connected to the lifting plate (11), and the bottom of the support plate (8) is fixedly installed with a servo motor (14), and the end of the output shaft of the servo motor (14) passes through the support plate (8) and is fixedly connected to the lifting screw (10).

4. A portable vacuum drying oven for use in field conditions according to claim 2, characterized in that: The adjusting plate (19) is provided with a groove on its outside, and a sealing ring (24) is arranged in the groove, and the sealing ring (24) is in contact with the inner wall of the vacuum drying box (1).

5. A portable vacuum drying oven for use in field conditions according to claim 3, characterized in that: The top of the support plate (8) is symmetrically fixedly connected to a limiting rod (31), and the top of the limiting rod (31) slides through the lifting plate (11) and is fixedly connected to the fixing plate (9).

6. A portable vacuum drying oven for use in field conditions according to claim 3, characterized in that: The length of the fixing plate (9) is smaller than the distance between the fixing rods (13) at the two ends of the top of the lifting plate (11).

7. A portable vacuum drying oven for use in the field according to claim 3, characterized in that: The vacuum drying box (1) is symmetrically provided with universal wheels (5) at the bottom end of the vertical surface of the support plate (8), and the vacuum drying box (1) is provided with a pull rod (6) at one side of the universal wheels (5).

8. A portable vacuum drying oven for use in the field according to claim 7, characterized in that: A shoulder strap (7) is symmetrically arranged on one side of the vacuum drying box (1) away from the pull rod (6).

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