TWI813908B - vacuum dryer - Google Patents

Abstract

A vacuum dryer includes a body, a plurality of reinforced parts, a vacuum module and a control unit. The body includes a box body and a door body, wherein the box body is rectangular and defines a chamber, and the box body forms an opening. The door body is connected to the box body and opens and closes relative to the opening; the reinforcing member is arranged in the box body and the door body. ; The vacuum module includes a vacuum pump and a vacuum pipeline, where the vacuum pipeline is connected between the box and the vacuum pump, and the vacuum pump is connected to the chamber through the vacuum pipeline; the control unit is electrically connected to the vacuum module, And it includes a host, a body control unit and a pressure sensor. The host includes an output unit and an input unit. The body control unit is electrically connected to the host. The pressure sensor is arranged on the box and electrically connected to host.

Description

Vacuum dryer

The present invention provides a vacuum dryer, and particularly relates to a vacuum dryer that can increase the working volume and prevent the body from denting during the drying process.

Vacuum drying is a process widely used in industry. Generally speaking, when an object is dried, excess moisture and water vapor can be separated from the interior and surface of the object, so that the quality of the object to be dried or its mechanical properties can be better performed in subsequent processing operations. Since during the drying process, the air pressure inside the drying furnace body is extremely low, while the outside of the furnace body maintains one atmosphere, it is quite easy for the furnace body to be unable to withstand the air pressure difference, causing the furnace body to dent, disintegrate or even explode during the drying process. Risks. Based on the above, most vacuum drying furnaces currently on the market are spherical in design. Through the support of the spherical geometric structure, they can bear the pressure difference from all directions. However, it is difficult to make the opening cover of the sphere drying furnace, and the volume space is relatively small, and most of the workpieces to be dried cannot match the curvature and contour of the sphere, thus causing a waste of electricity.

The inventor then devoted his mind to research and developed a rectangular parallelepiped-shaped vacuum dryer in order to increase the working volume.

The invention provides a vacuum dryer, which includes a body, a plurality of reinforcing parts, a vacuum module and a control unit. The body includes a box body and a door body, wherein the box body is rectangular and defines a chamber, and the box body forms an opening. The door body is connected to the box body and opens and closes relative to the opening; the reinforcing member is arranged in the box body and the door body. ;The vacuum module includes a vacuum pump and a vacuum pipeline, where the vacuum pipeline It is connected between the box and the vacuum pump, and the vacuum pump is connected to the chamber through the vacuum pipeline; the control unit is electrically connected to the vacuum module, and includes a host computer, an integral control unit and a pressure sensor, wherein The host includes an output unit and an input unit. The body control unit is electrically connected to the host. The pressure sensor is arranged on the box and electrically connected to the host.

In one embodiment, the above-mentioned vacuum dryer further includes a heating module. The heating module is electrically connected to the control unit and includes a heating device and a heating pipe. The heating pipe is connected to the heating device, and the heating pipe A part of the road passes through the box and is arranged on the wall of the chamber. The control unit also includes a temperature sensor, which is disposed on the box and electrically connected to the host.

In one embodiment, the above-mentioned vacuum module further includes a cooling unit, a filtration unit and a vacuum buffer unit. The vacuum pump is connected to the box through a cooling unit, a filter unit and a vacuum buffer unit. The heating module also includes a heating buffer unit. The heating buffer unit is arranged on the box and connected between the heating device and the box.

In one embodiment, the vacuum dryer further includes a sliding mechanism and an air-tight mechanism, wherein the sliding mechanism includes a slide rail and at least one connecting piece, the sliding rail is set up on the door body, and the connecting piece is connected to the door body; air-tight The mechanism is arranged on at least one side of the box. The sliding mechanism and the air-tight mechanism are electrically connected to the host. The door slides relative to the box through the sliding mechanism. A plurality of seals are arranged on the adjacent edge of the opening, and the door fits these seals through the air-tight mechanism. superior.

In one embodiment, the vacuum dryer further includes a base part and a vehicle, wherein the body is disposed on a part of the base part, the base part includes a track and forms a groove, and the bottom of the track is coplanar with the bottom surface of the chamber. , and the door body is suspended on the ditch; the trolley is slid on the track and includes a plurality of driving wheels and two driven wheels. The driven wheels are respectively arranged in the first and last intervals of these driving wheels in the forward direction of the trolley.

In one embodiment, the above-mentioned trolley further includes a carrying part, a plurality of gear sets and a transmission shaft. The driving wheel and the driven wheel are arranged under the carrying part and connected to the gear set. The transmission shaft passes through these driving wheels and One of the driving wheels and a corresponding gear set in the gear set are connected to other driving wheels and gear sets through at least one transmission member.

In one embodiment, the vacuum dryer further includes a power mother vehicle, wherein the power mother vehicle includes a power motor, a reduction mechanism and a connection part. One end of the reduction mechanism is connected to the power motor, and the connection part is relative to the power motor and the reduction part. The mechanism protrudes, the other end of the reduction mechanism is connected to the transmission shaft, and the connecting part is penetrated through the bearing part.

In one embodiment, the above-mentioned reinforcement members are arranged at equal intervals relative to the box and the door, and the density of the reinforcement members is a target vacuum degree, a vacuum leakage rate, a total weight of the box and the door, and a total weight of the box and the door. And the function of the total area of the inner wall of the door body.

In one embodiment, the above-mentioned body further includes an insulation material, and the insulation material is arranged inside the door body and the box body.

In one embodiment, the above-mentioned thermal insulation material is thermal insulation cotton, ceramic wool or glass fiber.

In this way, the rectangular parallelepiped vacuum dryer of the present invention can increase the effective working volume, greatly increasing the number of objects to be dried in one drying process, and through the support of the reinforcing parts, it can effectively prevent the dryer from being damaged due to the difference in internal and external air pressure. Improve the safety and stability of operations.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

1: Vacuum dryer

100:Ontology

110: Cabinet

112: Chamber

114:Open your mouth

116:Orbit

118:Seals

120:Door body

130: Insulation material

140:Block

200: Reinforcement parts

300: Vacuum module

310: Vacuum pump

312: Main pump

314:Help pump

320: Vacuum pipeline

322:Vacuum breaking port

330: Cooling unit

332:Condenser

334:Heat exchanger

340:Filter unit

350: Vacuum buffer unit

360:Recycling Department

400:Control unit

410:Host

420: Ontology control unit

422: Vacuum control module

424: Temperature control module

430: Pressure sensor

440:Temperature sensor

500: Heating module

510:Heating device

520:Heating pipeline

530: Heated buffer unit

540:Recycling Department

600:Sliding mechanism

610:Slide rail

620: Connector

630: Air tight mechanism

700: Foundation

710:Orbit

720: ditch

800: Trolley

810: Bearing Department

820: Driving wheel

830: driven wheel

840:Gear set

850: Drive shaft

860:Connection port

870:Guardrail

900: Power mother car

910:Power motor

920: Reduction mechanism

930:Connection Department

Figure 1 is a schematic three-dimensional view of an embodiment of the vacuum dryer of the present invention.

Figure 2 is a schematic top view of Figure 1.

FIG. 3 is a schematic front view of FIG. 2 with some components omitted.

Figure 4 is a schematic diagram of the box in Figure 2.

Figure 5 is a schematic side view of an embodiment of the trolley of the present invention.

FIG. 6 is a schematic front view of the trolley in FIG. 5 .

Figure 7 is a schematic side view of the main body and the foundation in Figure 1.

Figure 8 is a schematic top view of an embodiment of the power mother vehicle of the present invention.

Figure 9 is a schematic diagram of the box in Figure 4 after the trolley is pushed in.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. It is worth mentioning that the directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative rather than limiting. In addition, in the following embodiments, the same or similar elements will use the same or similar reference numerals.

Please refer to FIGS. 1 to 3 , wherein FIG. 1 is a schematic perspective view of an embodiment of the vacuum dryer of the present invention, FIG. 2 is a schematic top view of FIG. 1 , and FIG. 3 is a schematic front view of FIG. 2 with some components omitted. The vacuum dryer 1 of this embodiment includes a body 100, a plurality of reinforcements 200 (as shown in Figure 7), a vacuum module 300 and a control unit 400. The body 100 includes a box 110 and a door 120. The door 120 is connected to the box 110; the reinforcement 200 is, for example, H-shaped steel or I-shaped steel, and is arranged in the box 110 and the door 120; the vacuum module 300 includes a vacuum pump 310 and a vacuum pipeline 320, wherein The vacuum pipeline 320 is connected between the box 110 and the vacuum pump 310; and the control unit 400 is electrically connected to the vacuum module 300, and includes a host 410, an body control unit 420 and a pressure sensor 430, where the host 410 For example, it is an industrial computer. The main control unit 420 is, for example, a control box and is electrically connected to the host 410. The pressure sensor 430 is disposed on the box 110 and is electrically connected to the host 410 to detect the inside of the box 110. pressure.

Specifically, the vacuum dryer 1 is used to dry precision electronic products, such as transformers, resistors, etc. In order to increase the working volume during the drying process, the box 110 is in the shape of a rectangular parallelepiped and defines a chamber 112. Since the wall of the box 110 The thickness is uniform, so the chamber 112 is also in the shape of a rectangular parallelepiped. Compared with the common spherical drying ovens on the market, it can provide a larger effective utilization space, thereby saving the time and electricity consumed by multiple drying processes due to lack of space. . In addition, the box body 110 is formed with an opening 114 , and the door body 120 is adapted to selectively open and close relative to the opening 114 .

In addition, the vacuum dryer 1 of this embodiment also includes a heating module 500 for heating the inside of the chamber 112 before drying the workpiece. The heating module 500 is electrically connected to the control unit 400 and includes a Heating device 510 and a heating pipe 520. The heating device 510 is, for example, a kerosene heating furnace, but it can also be an electric heater, a steam furnace, a high-temperature water circulation module, a gas heater or a ceramic heater. The present invention Without limitation, the heating pipeline 520 is connected to the heating device 510 and the box 110, and the control unit 400 also includes a temperature sensor 440, where the temperature sensor 440 is disposed on the box 110 and is electrically connected to the host computer. 410, used to detect the temperature inside the box 110.

On the other hand, the vacuum pump 310 is connected to the chamber 112 through the vacuum pipeline 320. The vacuum pump 310 includes a main pump 312 and a booster pump 314, and the main pump 312 and the booster pump 314 can be in the form of The present invention is not limited to any type of pump, such as a high-speed pump, an oil-type pump, a water-sealed pump or a power-assisted pump. Preferably, the vacuum module 300 further includes a cooling unit 330, a filter unit 340, a vacuum buffer unit 350 and a recovery part 360, and the vacuum pump 310 is connected through the cooling unit 330, the filter unit 340 and the vacuum buffer unit 350. in the box 110. Specifically, the cooling unit 330 includes A condenser 332 and a heat exchanger 334, where the heat exchanger 334 is, for example, a water ice machine, the filter unit 340 is, for example, a filter that can filter dust and particles in the air, and the vacuum buffer unit 350 is, for example, an air buffer barrel, The recovery part 360 is arranged below the condenser 332 . On the other hand, the heating module 500 also includes a heating buffer unit 530 and a recovery part 540. The heating buffer unit 530 is, for example, an oil and gas buffer barrel, and the recovery part 540 is, for example, an oil and gas collection barrel. Therefore, when the heating device 510 heats a heating medium such as kerosene, the heated heating medium will flow through the box 110 through the heating pipe 520 to heat the box 110, and the vaporized oil and gas with a temperature higher than the boiling point can be temporarily stored. In the heating buffer unit 530, the heating pipeline 520 is prevented from being damaged due to the vaporization and expansion of the heat medium. When the temperature inside the chamber 112 reaches the specified target, the vacuum pump 310 can evacuate the chamber 112 through the vacuum pipeline 320. Since the extracted air may contain particles, dust and volatile oil and gas, the extracted air at this time can It is temporarily stored in the vacuum buffer unit 350, and impurities such as particles and dust can be filtered out by the filter unit 340. The condenser 332 performs heat exchange on the filtered oil and gas through the heat exchanger 334, and then condenses the oil and gas through the recovery part 360. Recycle, separate through separation devices, etc. and then recycle and reuse. After the heating and drying process is completed, the oil vapor stored in the heating buffer unit 530 can also be condensed and then recovered by the recovery part 540 and reused. On the other hand, the box 110 is also equipped with a vacuum breaking port 322, where the vacuum breaking port 322 is connected to the chamber 112 and is used to break the vacuum after the drying process is completed.

As shown in FIG. 3 , the main body control unit 420 is used to provide the user with various control parameters, such as adjusting the target vacuum degree, process temperature, drying time, etc. Preferably, the main body control unit 420 is equipped with a vacuum control module 422 and a temperature control module 424, which can monitor the values of the pressure sensor 430 and the temperature sensor 440 at any time and be manually controlled by the user. In addition to necessary components such as programs and programmable assemblers required to control the operation of the vacuum dryer 1, the host computer 410 also includes an input unit and an output unit. The input unit is, for example, a keyboard and a mouse, and the output unit is, for example, One screen. Thereby, the user can set the recipe of the drying process through the main body control unit 420, and set the parameters on the main body 100. A built-in image sensor monitors the entire process. In addition, the host 410 also includes a communication module and a prompt unit, which can upload and store process data or results in a wired or wireless manner. When any abnormality occurs during the drying process, the prompt unit will send out an alarm message. Warning the user so that the maintenance technician can deal with various conditions of the vacuum dryer 1 immediately.

Preferably, the above-mentioned host 410, temperature control module 424 and pressure sensor are configured in an air-conditioned box with constant temperature control, which can ensure the stability of the operation of the electronic instruments and sensors.

It is worth mentioning that the vacuum dryer 1 of this embodiment can handle large-volume and high-weight objects to be dried, such as boiler components with a side length of 3 meters and a weight of several tons. Therefore, when the main body 100 is moved to a position by a transport device such as a forklift, a retaining body 140 can be disposed around the main body 100. The retaining body 140 is, for example, a retaining wall constructed of concrete, which can prevent the wall of the factory building from being damaged. Or soil clods from the external environment may contact the main body 100 and cause damage to the vacuum dryer 1 .

Please refer to Figure 4, which is a schematic diagram of the box in Figure 2. As shown in the figure, a part of the heating pipeline 520 runs through the box 110 and is arranged on the wall of the chamber 112. In order to maintain the working temperature of the chamber 112, preferably, the body also includes an insulation material 130. , and the thermal insulation material 130 is arranged inside the door 120 and the box 110 . Preferably, the thermal insulation material can be thermal insulation cotton, ceramic wool or glass fiber. In other possible embodiments, the insulation material 130 can also be embedded in the walls of the box 110 and the door 120 , thereby saving the space occupied by the body 100 .

In addition, in this embodiment, a track 116 is formed at the bottom of the box 110 to allow the trolley 800 (please refer to FIGS. 5 and 6 ) carrying the objects to be dried to enter the box 110 , and the box 110 is connected to the box 110 . A plurality of seals 118 are disposed on the adjacent edge of the opening 114 , where the seals 118 are, for example, rubber strips or other materials, used to improve the sealing degree of the box 110 when the door 120 is closed relative to the box 110 .

Please refer to FIGS. 5 and 6 . FIG. 5 is a schematic side view of an embodiment of the trolley of the present invention, and FIG. 6 is a schematic front view of the trolley of FIG. 5 . The vacuum dryer 1 of this embodiment includes a cart 800 for transporting the objects to be dried into the chamber, and the cart 800 includes a carrying part 810, a plurality of driving wheels 820, two driven wheels 830, a plurality of gear sets 840 and A transmission shaft 850, in which the driving wheel 820 and the driven wheel 830 are arranged below the bearing part 810 and connected to the gear set 840. The transmission shaft 850 passes through the driving wheels 820 and one of the driving wheels 820 in the gear sets 840 and the corresponding A gear set 840. Preferably, the transmission shaft 850 is passed through a set of driving wheels 820 and gear sets 840 on the frontmost side of the trolley 800, and the driving wheels 820 and gear sets 840 of the transmission shaft 850 are passed through at least one transmission A component (not shown) is connected to other driving wheels 820 and gear sets 840, where the transmission component is, for example, a chain or a crawler track. Through such a configuration, when the trolley 800 is loaded with objects to be dried, the transmission shaft 850 inputs power and is moved by multi-wheel transmission at the same time, thereby saving the cost of manpower to move the objects. In addition, in order to increase the carrying capacity of the trolley 800 and prevent the objects to be dried from falling out of the trolley 800, the trolley 800 in this embodiment is designed in a double-layer load-bearing form, and a guardrail 870 is also provided on the trolley 800 to further lift the objects to be dried. stability.

Please refer to Figure 7, which is a schematic side view of the body and the foundation in Figure 1. Since the vacuum dryer 1 of this embodiment needs to handle high-weight and large-volume objects, in order to more stably transport the dry objects into the chamber 112, the vacuum dryer 1 also includes a foundation part 700, which is laid on On the ground, and the main body 100 is disposed on a part of the foundation 700, it can prevent the box 110 and the trolley 800 carrying dry goods from sinking into the ground due to excessive weight. In addition, the base part 700 also includes a track 710 and forms a groove 720, wherein the base part 700 includes a part of the track 710 that is higher than a part forming the groove 720, and the bottom of the track 710 is designed to be consistent with the chamber 112 The bottom surfaces are coplanar, thereby reducing the height difference when the trolley 800 moves into the box 110, thereby preventing the objects to be dried from tipping over. On the other hand, as shown in the figure, the vacuum dryer 1 also includes a sliding mechanism 600 and an airtight mechanism 630, where the sliding mechanism 600 includes a slide rail 610 and There is one less connecting piece 620 , the slide rail 610 is set up on the door body 120 , the connecting piece 620 is connected to the door body 120 , and the air-tight mechanism 630 is disposed on at least one side of the box 110 .

Specifically, due to the large size of the vacuum dryer 1, the weight of the door body 120 is also considerable, making it difficult to move it by manpower alone. Therefore, the sliding mechanism 600 and the air-tight mechanism 630 are electrically connected to the host 410 . When the user needs to open the door 120, he can control the sliding mechanism 600 through the host 410, so that the door 120 slides off the ground relative to the box 110 through the sliding mechanism 600. Since the door body 120 is suspended on the groove 720, the lower edge of the door body 120 will not rub against the ground, thereby improving the smoothness of the door body 120 when sliding. On the other hand, when the user needs to close the door 120 to perform work, he can also control the sliding mechanism 600 through the host 410 to make the door 120 slide and be positioned at the box 110. At this time, the air-tight mechanism arranged on the box 110 A part of 630 will penetrate into the corresponding component arranged on the door body 120, so that the door body 120 can fit on the box body 110, and since the seal 118 is arranged on the adjacent edge of the opening 114, the door body 120 can The air-tight mechanism 630 is attached to the seal 118 to maintain the vacuum degree of the vacuum dryer 1 .

It is worth mentioning that the two driven wheels 830 of the above-mentioned trolley 800 are respectively arranged at the lower and last intervals of the driving wheel 820 in the forward direction of the trolley 800 . Through such a configuration, when the center of gravity of the trolley 800 carrying objects to be dried has not yet crossed the ditch 720, the front or rearmost driving wheel 820 can directly pass through the ditch 720 and still maintain the balance of the trolley body; and when the center of gravity of the trolley 800 When approaching the ditch 720, since the driven wheel 830 has crossed the ditch 720 and is supported on the opposite side in the forward or backward direction, the vehicle body will not tip over because the driving wheel 820 is off the ground, thereby maintaining the stability of cargo transportation.

In addition, as shown in FIG. 7 , the reinforcing members 200 are arranged at equal intervals relative to the box 110 and the door 120 , and the arrangement density of these reinforcing members 200 is a target vacuum degree, a vacuum leakage rate, the box 110 and the door 120 . A function of a total weight of the door body 120 and a total area of the inner walls of the box body 110 and the door body 120 . The configuration density calculated through the above function can make the center of each surface of the box 110 and the door 120 with side length L The area (greater than L/4 and less than 3L/4) can withstand the maximum load amplitude caused by the internal and external pressure difference, and the surrounding area (less than L/4 or greater than 3L/4) on each surface of the box 110 and the door 120 ) can withstand half the amplitude of the load caused by the internal and external pressure difference. The change in the load amplitude can be linear or nonlinear, and the invention is not limited to this.

Please refer to Figures 8 and 9 together. Figure 8 is a schematic top view of an embodiment of the power mother car of the present invention, and Figure 9 is a schematic view of the box in Figure 4 after the trolley is pushed in. In this embodiment, the vacuum dryer 1 further includes a power mother car 900 , and the power mother car 900 is suitable for transporting the trolley 800 to the chamber 112 by pushing or pulling. As shown in the figure, at least one connection port 860 is formed on the front end of the trolley 800, and the power parent vehicle 900 includes a power motor 910, a reduction mechanism 920 (for example, a reduction gear set) and at least one connection part 930 (for example, a connecting rod), wherein One end of the reduction mechanism 920 is connected to the power motor 910 , and the connecting portion 930 protrudes relative to the power motor 910 and the reduction mechanism 920 . When the user wants to connect the power mother car 900 to the dolly 800, the other end of the reduction mechanism 920 will be connected to the connection port 860 of the dolly 800. The connection port 860 drives the transmission shaft 850 through the gear set 840, and the connection part 930 is also penetrated On the connection port 860, through the double deceleration effect of the deceleration mechanism 920 and the gear set 840, the high speed generated by the power motor 910 can be converted into the high torque of the driving wheel 820, thereby allowing the power mother car 900 to move the trolley 800 along the track 710. Push it into the chamber 112 to form a state as shown in Figure 9. It is worth mentioning that in other embodiments, the connection port 860 can also be formed on the power mother car 900, and the connecting part 930 is carried by the trolley 800, thereby achieving the same effect.

The present invention has been disclosed in preferred embodiments above. However, those skilled in the art should understand that the above embodiments are only used to illustrate the present invention and should not be interpreted as limiting the scope of the present invention. It should be noted that any changes and substitutions that are equivalent to the above-described embodiments should be considered to be within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope of the patent application.

1: Vacuum dryer

100:Ontology

110: Cabinet

112: Chamber

114:Open your mouth

116:Orbit

120:Door body

400:Control unit

600:Sliding mechanism

Claims (10)

A vacuum dryer includes: a body, including: a box body, which is in the shape of a rectangular parallelepiped and defines a chamber, and the box body is formed with an opening; and a door body, which is connected to the box body and opens and closes relative to the opening; A plurality of reinforcements are arranged in the box and the door; a vacuum module includes: a vacuum pump; and a vacuum pipeline connected between the box and the vacuum pump, and the vacuum pump It is connected to the chamber through the vacuum pipeline; a control unit is electrically connected to the vacuum module and includes: a host including an output unit and an input unit; a body control unit electrically connected to the host; and a pressure sensor, which is arranged on the box and is electrically connected to the host; a sliding mechanism, which is electrically connected to the host and includes a slide rail and at least one connecting piece, the slide rail is set up on the door body On the top, the connecting piece is connected to the door body, and the door body slides off the ground relative to the box body through the sliding mechanism; and a foundation part includes a track and forms a groove, and the body is arranged on a side of the foundation part In part, the bottom of the track is coplanar with the bottom of the chamber, and the door floats above the trench. The vacuum dryer according to claim 1, further comprising a heating module electrically connected to the control unit and including: a heating device; and a heating pipeline connected to the heating device, the heating A part of the pipeline runs through the box and is arranged on the wall of the chamber; wherein, the control unit also includes a temperature sensor, which is arranged on the box and is electrically connected on this host. The vacuum dryer of claim 2, wherein the vacuum module further includes a cooling unit, a filter unit and a vacuum buffer unit, and the vacuum pump is connected to the cooling unit through the cooling unit, the filter unit and the vacuum buffer unit. The box and the heating module also include a heating buffer unit, which is disposed on the box and connected between the heating device and the box. The vacuum dryer according to claim 1, further comprising: an air-tight mechanism arranged on at least one side of the box; wherein, the air-tight mechanism is electrically connected to the host, and an air-tight mechanism is arranged on the adjacent edge of the opening. A plurality of sealing members are provided, and the door body is attached to the plurality of sealing members through the air-tight mechanism. The vacuum dryer as claimed in claim 1, further includes: a vehicle, which is slidably installed on the track and includes a plurality of driving wheels and two driven wheels. The two driven wheels are respectively arranged on the plurality of driving wheels and the trolley moves forward. the first gap in the direction and the last gap in the direction. The vacuum dryer according to claim 5, wherein the trolley further includes a carrying part, a plurality of gear sets and a transmission shaft, and the plurality of driving wheels and the two driven wheels are arranged below the carrying part and connected to the plurality of driving wheels. A gear set, the transmission shaft passes through the plurality of driving wheels and one of the driving wheels and a corresponding gear set in the plurality of gear sets, and the driving wheel and the gear set are connected to other driving wheels through at least one transmission member The driving wheel and gear set. The vacuum dryer according to claim 6 further includes a power mother vehicle, which includes a power motor, a reduction mechanism and a connection part. One end of the reduction mechanism is connected to the power motor, and the connection part is opposite to the power motor. Protruding from the power motor and the reduction mechanism, the other end of the reduction mechanism is connected to the transmission shaft, and the connection part passes through the bearing part. The vacuum dryer of claim 1, wherein the plurality of reinforcing parts are arranged at equal intervals relative to the box and the door, and the arrangement density of the plurality of reinforcing parts is a target vacuum degree, a vacuum leakage rate, A function of a total weight of the box and the door and a total area of the inner wall of the box and the door. The vacuum dryer according to claim 1, wherein the body further includes an insulation material, and the insulation material is arranged inside the door and the box. The vacuum dryer according to claim 9, wherein the insulation material is insulation cotton, ceramic wool or glass fiber.