Rapeseed drying device and control method thereof

Abstract

The application provides a rapeseed drying device and a control method thereof, the vacuum low-temperature drying module is installed in the shell, the solar frequency division electric heating combined supply module is installed on the shell, the pipeline circulation system is connected with the vacuum low-temperature drying module and the solar frequency division electric heating combined supply module respectively, the solar frequency division electric heating combined supply module is used for collecting solar energy and converting the solar energy into electric energy and heat energy through solar frequency division, the solar frequency division electric heating combined supply module stores the electric energy, the solar frequency division electric heating combined supply module transmits the heat energy into the pipeline circulation system and is used for heating the rapeseed in the vacuum low-temperature drying module, and the control device is connected with the solar frequency division electric heating combined supply module, the vacuum low-temperature drying module and the pipeline circulation system respectively. Through the solar frequency division electric heating combined supply module, the application improves the utilization efficiency of light energy, can realize independent power supply and does not need external power supply, and the device has high flexibility, is convenient to move and is widely applied.

Description

Technical Field

[0001] This invention belongs to the field of mechanical engineering technology, and in particular relates to a rapeseed drying device and its control method. Background Technology

[0002] The most critical issue in the entire process of rapeseed production, from planting to finished product, is drying after harvest. Due to weather conditions or poor performance of the equipment itself, most drying equipment suffers from the following problems: using high-temperature drying can easily lead to oil leakage from the rapeseed; using low-temperature drying results in long drying times and low efficiency. Therefore, it is essential to adjust the drying temperature appropriately during rapeseed drying. If the temperature is too low, the moisture will be absorbed too slowly; if the temperature is too high, oil leakage will occur, hindering drying and potentially causing a fire. Currently, typical dryers on the market include drum dryers and fluidized bed dryers. Most dryers use hot air as the drying medium. Hot air drying is an instantaneous process with relatively high temperatures, which can easily cause uneven thermal stress on the internal structure of the rapeseed, leading to cracking. Therefore, the drying effect is often poor, and insufficient drying can easily lead to moisture absorption, sprouting, and mold growth. Rapeseed has a strong hydrophilicity, so rapeseed drying equipment should have good sealing performance to ensure the air humidity inside the drying equipment. Existing technology mentions using vacuum drying technology to reduce pressure, thereby further reducing the temperature required for rapeseed drying, ensuring drying efficiency while improving drying quality. However, most rapeseed vacuum dryers have complex structures and require external power supply, which is not conducive to energy conservation, and their practical application scenarios are limited. Summary of the Invention

[0003] This invention aims to at least partially solve one of the aforementioned technical problems. To this end, this invention proposes a rapeseed drying device and its control method, combining solar-powered frequency-division cogeneration technology with vacuum low-temperature drying technology to improve energy utilization efficiency while enhancing the quality of rapeseed drying.

[0004] This invention utilizes a solar frequency-division electrothermal combined supply module to power the device with light in the target spectral band and collect light in other bands for heating and drying rapeseed, thereby improving the efficiency of light energy utilization and saving energy. This invention can achieve independent power supply without the need for an external power source, thus offering high flexibility, ease of movement, and wide applicability. By incorporating a vacuum low-temperature drying module, it ensures drying efficiency while improving drying quality, and features a simple structure.

[0005] Note that the description of these objectives does not preclude the existence of other objectives. One aspect of the invention does not require achieving all of the above objectives. Objectives other than those described above can be extracted from the description, drawings, and claims.

[0006] The technical solution of the present invention is: a rapeseed drying device, comprising a solar frequency-division electric heating module, a pipeline circulation system, a shell, a vacuum low-temperature drying module, and a control device;

[0007] The vacuum low-temperature drying module is installed inside the shell, and the solar frequency-divided electric heating module is installed on the shell. The pipeline circulation system is connected to the vacuum low-temperature drying module and the solar frequency-divided electric heating module respectively. The solar frequency-divided electric heating module is used to collect solar energy and convert solar energy into electrical energy and heat energy through solar frequency division. The solar frequency-divided electric heating module stores electrical energy and transfers heat energy to the pipeline circulation system for heating rapeseed in the vacuum low-temperature drying module. The control device is connected to the solar frequency-divided electric heating module, the vacuum low-temperature drying module and the pipeline circulation system respectively.

[0008] In the above scheme, the solar frequency-division combined heat and power module includes a Fresnel lens, a movable lens frame, a drive gear set, a drive servo motor, a lens container, a frame, a solar panel, a movable base plate, a reflector, a transmission gear set, and a battery.

[0009] The Fresnel lens is housed in a movable lens frame. One side of the movable lens frame is rotatably connected to the frame via a drive gear set, and the other side of the movable lens frame is rotatably connected to the frame via a transmission gear set. The drive gear set is connected to a drive servo motor, which is connected to a control device. The drive servo motor is mounted on the frame. The frame is mounted on a movable base plate, which is connected to the housing. The reflector is located below the Fresnel lens, and both sides of the reflector are rotatably connected to the frame. The transmission gear set is connected to one side of the reflector and is used to drive the reflector to rotate. The lens container and the solar panel are arranged vertically and are both located on the inner side of the lower part of the frame. The lens container is located below the reflector. A battery is installed on the solar panel and is connected to both the solar panel and the control device.

[0010] The lens container includes a concave cover and a container body. The concave cover is installed on the container body. Both the concave cover and the container body are made of transparent material. The concave cover and the container body together form a concave lens.

[0011] The container is filled with a frequency-dividing liquid, which is used to divide solar energy into frequencies. The container is equipped with a liquid exchange port.

[0012] In the above scheme, the transmission gear set includes a first transmission gear, a second transmission gear, a third transmission gear, and a fourth transmission gear;

[0013] The first transmission gear is mounted on the frame via the second gear shaft and is supported by the third bearing seat. The third transmission gear is mounted on the frame via the third gear shaft and is supported by the fifth bearing seat. The movable lens frame is rotatably connected to the frame via the third gear shaft, allowing the movable lens frame to rotate around the common axis of the drive gear set and the third gear shaft. One end of the reflector is rotatably connected to the frame via the first gear shaft, and the other end of the reflector is rotatably connected to the frame via the second gear shaft, allowing the reflector to rotate around the common axis of the first and second gear shafts. The second and fourth transmission gears are coaxially connected via the fourth gear shaft. The first and second transmission gears mesh, and the fourth and third transmission gears mesh.

[0014] In the above scheme, the first transmission gear, the second transmission gear, the third transmission gear, and the fourth transmission gear have the same module and a gear ratio of 4:2:3:3, which makes the first transmission gear and the third transmission gear coaxial, in the same direction, but at different speeds, and the speed ratio is 1:2.

[0015] The above solution also includes a gimbal and a photosensor;

[0016] The gimbal is mounted on the housing, the solar frequency-division combined heat and power module is mounted on the gimbal, and the gimbal is connected to the control device.

[0017] The photosensitive sensors are respectively installed at the midpoint of each side of the movable lens frame. The photosensitive sensors are connected to the control device. Each photosensitive sensor transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of the photosensitive sensors on each opposite side of the movable lens frame, thereby controlling the drive servo and gimbal in real time to make the light intensity of each opposite side photosensitive sensor consistent, so that sunlight can be perpendicularly incident on the Fresnel lens in the solar frequency-division electric heating module in real time.

[0018] In the above scheme, the vacuum low-temperature drying module includes a vacuum chamber, a vacuum pump, a collection device, a drying rack, a third electromagnetic reversing valve, and a temperature sensor;

[0019] The vacuum chamber is equipped with a feed inlet and a feed door. When the feed door is closed, the vacuum chamber is a fully sealed container. The vacuum chamber is installed inside the shell and contains a drying rack. The vacuum pump and a collection device are installed on the inner wall of the shell or the outer wall of the vacuum chamber. The air inlet of the vacuum pump is connected to the C port of the third electromagnetic reversing valve. The A port of the third electromagnetic reversing valve is connected to the air extraction port on the vacuum chamber. The outlet of the vacuum pump is connected to the collection device. A temperature sensor is installed inside the vacuum chamber to detect the temperature of the vacuum chamber and transmit it to the control device. The vacuum pump, the third electromagnetic reversing valve, the temperature sensor, and the control device are connected.

[0020] In the above scheme, the pipeline circulation system includes several concave lens-integrated copper pipes, a diverter, an electric heating tape, a first flexible hose, a second flexible hose, a first connecting pipe, a circulation pump, a second connecting pipe, a heating copper pipe, a heat storage buffer element, a first electromagnetic reversing valve, and a second electromagnetic reversing valve.

[0021] The concave lens has an internal copper tube connected to the container body in the solar frequency-divided electric heating module. A distributor is provided at each of the left and right ends of the internal copper tube. One distributor is sequentially connected to a first flexible hose, a first connecting pipe, a circulation pump, a second connecting pipe, and one end of a heating copper tube. An electric heating tape is wrapped around the heating copper tube. The other end of the heating copper tube is connected to port a of the first electromagnetic reversing valve via a third connecting pipe. Port b of the first electromagnetic reversing valve is connected to port c of the second electromagnetic reversing valve via a fifth connecting pipe. Port c of the first electromagnetic reversing valve is connected to the opening at the bottom of the heat storage buffer element via a fourth connecting pipe. Port b of the second electromagnetic reversing valve is connected to the opening at the top of the heat storage buffer element via a sixth connecting pipe. Port a of the second electromagnetic reversing valve is connected to one end of the second flexible hose via a seventh connecting pipe. The other end of the second flexible hose is connected to another distributor. The circulation pump, the first electromagnetic reversing valve, and the second electromagnetic reversing valve are respectively connected to a control device.

[0022] A method for controlling a rapeseed drying device includes the following steps:

[0023] The solar frequency-divided electric heating module converts solar energy into electrical and thermal energy through solar frequency division. The solar frequency-divided electric heating module stores the electrical energy and transfers the thermal energy to the pipeline circulation system. The control device heats the rapeseed in the vacuum low-temperature drying module by controlling the pipeline circulation system and the vacuum low-temperature drying module.

[0024] The above scheme also includes the following steps:

[0025] Each photosensitive sensor transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of the photosensitive sensors on each opposite side of the lens movable frame, thereby controlling the drive servo and gimbal in real time to make the light intensity of each opposite side photosensitive sensor consistent, so that sunlight can be incident perpendicularly on the Fresnel lens in the solar frequency-division electric heating module in real time.

[0026] The above solution specifically includes the following steps:

[0027] Step S1: During operation, when all photosensitive sensors detect that the light intensity reaches the preset value, the control device controls the connection of port a and port b of the first electromagnetic reversing valve, the connection of port a and port c of the second electromagnetic reversing valve, the connection of port a and port c of the third electromagnetic reversing valve, and the power supply of the circulation pump. At this time, the fifth connecting pipe and the third connecting pipe are in a connected state. The sunlight is converted into electrical energy and heat energy through the solar frequency splitting electrothermal combined power supply module. The electrical energy is stored in the solar panel. The solar panel supplies power to the control device, the vacuum low temperature drying module and the drive servo motor. The heat energy is conducted to the heating copper pipe through the concave lens and heats the rapeseed on the drying rack in the vacuum chamber through the heating copper pipe.

[0028] Step S2: When not in operation, when all photosensitive sensors detect that the light intensity has reached the preset value, the control device controls the first electromagnetic reversing valve and the third electromagnetic reversing valve to de-energize, and the control device controls the second electromagnetic reversing valve to connect port a and port b and energize the circulation pump. At this time, the sixth connecting pipe and the heat storage buffer element are in a connected state. Sunlight is converted into electrical energy and light energy through the solar frequency splitting electrothermal cogeneration module. The electrical energy is stored in the solar panel, and the heat energy is conducted to the heat storage buffer element for heat storage through the heat conduction of the copper tube built into the concave lens.

[0029] Step S3: During operation, when all photosensitive sensors detect that the light intensity has not reached the preset value, the control device controls the connection of port a and port b of the second electromagnetic reversing valve, the connection of port a and port c of the first electromagnetic reversing valve, the connection of port a and port c of the third electromagnetic reversing valve, and the power supply of the circulation pump. At this time, the fifth connecting pipe and the third connecting pipe are in a disconnected state, while the sixth connecting pipe, the fourth connecting pipe, and the third connecting pipe are in a connected state. Sunlight is converted into electrical energy and light energy through the solar frequency splitting electrothermal combined power supply module. The electrical energy is stored in the solar panel, which powers the control device, the vacuum low-temperature drying module, and the drive servo motor. The heat energy is transferred to the heat storage buffer element through the heat conduction of the copper tube built into the concave lens. The heat storage buffer element heats the pipeline circulation system. The control device turns on the electric heating tape. The temperature sensor in the vacuum low-temperature drying module transmits the detected temperature to the control device in real time. The control device compares the temperature value with the preset value to control the heating temperature of the electric heating tape, so that the temperature inside the vacuum chamber of the vacuum low-temperature drying module remains constant within the preset range.

[0030] Step S4: When not in operation, if all photosensitive sensors detect that the light intensity has not reached the preset value, the first electromagnetic reversing valve, the second electromagnetic reversing valve, the third electromagnetic reversing valve, and the circulation pump are de-energized.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention combines solar frequency-division cogeneration technology with vacuum low-temperature drying technology to improve energy utilization efficiency while enhancing the drying quality of rapeseed.

[0033] 2. This invention, by setting up a solar frequency-division electrothermal combined supply module, uses light in the target spectral band to power the device, and collects light in other bands to heat and dry rapeseed, thereby improving the utilization efficiency of light energy. This invention can achieve independent power supply without the need for an external power source. The device described in this invention is highly flexible, easy to move, and has a wide range of applications.

[0034] 3. This invention improves drying quality while ensuring drying efficiency by setting up a vacuum low-temperature drying module. It has a simple structure and a built-in condenser that can reliquefy the water vapor evaporated inside the chamber, so that the humidity inside the chamber is not affected by the water vapor evaporated inside the dried object.

[0035] 4. This invention uses a photosensitive sensor to transmit the light intensity at various locations of the Fresnel lens to a control device in real time. The control device controls the gimbal and drive gear set to rotate, ensuring that sunlight always enters along the perpendicular direction of the Fresnel lens, thereby improving the efficiency of light energy utilization, reducing light energy loss, and expanding the application scenarios of the device.

[0036] Note that the description of these effects does not preclude the existence of other effects. One aspect of the invention does not necessarily have all the aforementioned effects. Effects other than those described above can be readily observed and extracted from the description, drawings, claims, etc. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a rapeseed drying device according to the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the solar frequency-division cogeneration module described in this invention.

[0039] Figure 3 This is a schematic diagram showing the position of the photosensitive sensor described in this invention.

[0040] Figure 4 This is a top view of the drive gear set described in this invention.

[0041] Figure 5 This is a schematic diagram of the exploded structure of the lens container described in this invention.

[0042] Figure 6 This is a schematic diagram of the reflector structure described in this invention.

[0043] Figure 7 This is a schematic diagram of the transmission gear set structure described in this invention.

[0044] Figure 8 This is a schematic diagram of the pipeline circulation system structure described in this invention.

[0045] Figure 9 This is a schematic diagram of the vacuum low-temperature drying module described in this invention.

[0046] Figure 10 This is a schematic diagram of the optical path of the solar frequency division combined electric heating module described in this invention.

[0047] Figure 11 This is a right view of the solar frequency-divided combined heat and power module described in this invention.

[0048] Figure 12 This is a schematic diagram illustrating the working principle of the present invention.

[0049] Figure 13 This is the working logic table of the loop system described in this invention.

[0050] In the diagram: 1-Solar frequency-division combined heat and power module; 2-Pipeline circulation system; 3-Shell; 4-Gimbal; 5-Vacuum low-temperature drying module; 12-Drive gear set; 13-Drive servo motor; 14-Lens container; 15-Frame; 16-Solar panel; 17-Modible base plate; 18-Reflector; 19-Transmission gear set; 21-Concave lens with built-in copper tube; 22-Diverter; 25-Circulation pump; 26-Heating copper tube; 27-Heat-conducting fins; 29-Heat storage buffer element; 51-Vacuum chamber; 52-Condenser; 53-Vacuum pump; 54-Collection device; 56-Third electromagnetic reversing valve; 111-Fresnel lens; 112-Modible lens frame; 122-Driven gear; 123-First gear shaft; 124-Drive gear; 141-Concave cover; 142-Container body; 143-Liquid exchange port; 181 - Reflecting mirror; 182 Mirror clamping device; 192 First transmission gear; 193 Second transmission gear; 194 Third transmission gear; 195 Fourth transmission gear; 231 First flexible hose; 232 Second flexible hose; 241 First connecting pipe; 242 Second connecting pipe; 243 Third connecting pipe; 244 Fourth connecting pipe; 245 Fifth connecting pipe; 246 Sixth connecting pipe; 247 Seventh connecting pipe; 281 First electromagnetic reversing valve; 282 Second electromagnetic reversing valve; 1211 First bearing housing; 1212 Second bearing housing; 1911 Third bearing housing; 1912 Fourth bearing housing; 1913 Fifth bearing housing; 1914 Sixth bearing housing; 1961 Second gear shaft; 1962 Third gear shaft; 1963 Fourth gear shaft. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "front," "rear," "left," "right," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Figure 1-12 The image shows a preferred embodiment of the rapeseed drying device, which includes a solar frequency-division combined heat and power module 1, a pipeline circulation system 2, a shell 3, a vacuum low-temperature drying module 5, and a control device.

[0055] like Figure 11As shown, the vacuum low-temperature drying module 5 is installed inside the housing 3, and the solar frequency-divided electric heating module 1 is installed on the housing 3. The pipeline circulation system 2 is connected to the vacuum low-temperature drying module 5 and the solar frequency-divided electric heating module 1 respectively. The solar frequency-divided electric heating module 1 is used to collect solar energy and convert solar energy into electrical energy and heat energy through solar frequency division. The solar frequency-divided electric heating module 1 stores electrical energy and transfers heat energy to the pipeline circulation system 2 for heating the rapeseed in the vacuum low-temperature drying module 5. The control device is connected to the solar frequency-divided electric heating module 1, the vacuum low-temperature drying module 5 and the pipeline circulation system 2 respectively.

[0056] According to one embodiment of the present invention, preferably, the housing 3 is a single-sided open cuboid cavity, which facilitates the placement of the vacuum low-temperature drying module 5;

[0057] Preferred, such as Figure 2 , 3 As shown, the solar frequency-division cogeneration module 1 includes a Fresnel lens 111, a movable lens frame 112, a drive gear set 12, a drive servo motor 13, a lens container 14, a frame 15, a solar panel 16, a movable base plate 17, a reflector 18, a transmission gear set 19, and a battery.

[0058] The Fresnel lens 111 is disposed in the lens movable frame 112. One side of the lens movable frame 112 is rotatably connected to the frame 15 via a drive gear set 12, and the other side of the lens movable frame 112 is rotatably connected to the frame 15 via a transmission gear set 19. The drive gear set 12 is connected to the drive servo motor 13, which is connected to the control device. The drive servo motor 13 is mounted on the frame 15, which is disposed on a movable base plate 17 and connected to the housing 3. The reflector 18 is located below the Fresnel lens 111, and both sides of the reflector 18 are rotatably connected to the frame 15. The transmission gear set 19 is connected to one side of the reflector 18 and is used to drive the reflector 18 to rotate. The lens container 14 and the solar panel 16 are distributed vertically and are both disposed on the inner side of the lower part of the frame 15. The lens container 14 is located below the reflector 18. A battery is installed on the solar panel 16 and is connected to the solar panel 16 and the control device.

[0059] like Figure 4 As shown, preferably, the drive gear set 12 includes a first bearing housing 1211, a second bearing housing 1212, a driven gear 122, a first gear shaft 123, and a driving gear 124;

[0060] The driving gear 124 is coaxially mounted on the servo disk of the drive servo motor 13, and the driven gear 122 is coaxially mounted on the first gear shaft 123. The driven gear 122 meshes with the driving gear 124 and has the same pitch circle diameter. The tooth width of the driven gear 122 is greater than that of the driving gear 124. The first bearing seat 1211 and the second bearing seat 1212 are respectively provided on both sides of the first gear shaft 123 as its rotational support. The first bearing seat 1211 and the second bearing seat 1212 are both mounted on the frame 15. The lens movable frame 112 is connected to one side of the first gear shaft 123. During operation, the control device controls the drive servo motor 13 to rotate, the driving gear 124 drives the driven gear 122 to rotate, thereby driving the first gear shaft 123 to rotate, thereby causing the lens movable frame 112 to rotate and adjusting the angle of the Fresnel lens 111.

[0061] Preferred, such as Figure 7 As shown, the transmission gear set 19 includes a first transmission gear 192, a second transmission gear 193, a third transmission gear 194, and a fourth transmission gear 195;

[0062] The first transmission gear 192 is mounted on the frame 15 via the second gear shaft 1961 and is supported by the third bearing seat 1911. The third transmission gear 194 is mounted on the frame 15 via the third gear shaft 1962 and is supported by the fifth bearing seat 1913. The lens movable frame 112 is rotatably connected to the frame 15 via the third gear shaft 1962, allowing the lens movable frame 112 to rotate around the common axis of the first gear shaft 123 and the third gear shaft 1962. One end of the reflector 18 is connected via... The first gear shaft 123 is rotatably connected to the frame 15. The other end of the reflector 18 is rotatably connected to the frame 15 via the second gear shaft 1961, so that the reflector 18 can rotate around the common axis of the first gear shaft 123 and the second gear shaft 1961. The second transmission gear 193 and the fourth transmission gear 195 are coaxially connected via the fourth gear shaft 1963 and are supported by the fourth bearing seat 1912 and the sixth bearing seat 1914 respectively. The first transmission gear 192 meshes with the second transmission gear 193, and the fourth transmission gear 195 meshes with the third transmission gear 194. During operation, the drive servo motor 13 transmits power to the lens movable frame 112, which in turn transmits power to the third gear shaft 1962. The third gear shaft 1962 drives the third transmission gear 194 to rotate, which in turn drives the fourth transmission gear 195 to rotate. Since the fourth transmission gear 195 and the second transmission gear 193 are coaxial, the fourth transmission gear 195 drives the second transmission gear 193 to rotate, which in turn drives the first transmission gear 192 to rotate. The first transmission gear 192 drives the second gear shaft 1961 to rotate, which in turn drives the reflector 18 to rotate, thereby adjusting the angle of the reflector 18.

[0063] Preferably, the first transmission gear 192, the second transmission gear 193, the third transmission gear 194, and the fourth transmission gear 195 have the same module and a gear ratio of 4:2:3:3, making the first transmission gear 192 and the third transmission gear 194 coaxial, in the same direction, and at different speeds, with a speed ratio of 1:2. This ensures that the rotational speed of the Fresnel lens 111 is twice the rotational speed of the reflector 18, and that the position of the virtual image reflected by the Fresnel lens 111 onto the reflector 18 remains unchanged within the rotational range of the reflector 18. Furthermore, the intersection point of the reflected light rays coincides with the virtual focal point of the lens container 14, ensuring that within the adjustment range, the reflected and converging light rays, after passing through the concave lens, always illuminate the solar panel 16 as parallel rays. Figure 10 , Figure 11 As shown.

[0064] According to one embodiment of the present invention, preferably, the first transmission gear 192 has 60 teeth, the second transmission gear 193 has 35 teeth, the third transmission gear 194 has 45 teeth, and the fourth transmission gear 195 has 45 teeth;

[0065] Preferably, the main view of the frame 15 is a U-shaped structure, which facilitates the installation of the drive gear set 12 and the transmission gear set 19.

[0066] Preferred, such as Figure 5 As shown, the lens container 14 includes a concave cover 141 and a container body 142. The concave cover 141 is mounted on the container body 142. Both the concave cover 141 and the container body 142 are made of transparent material. The concave cover 141 and the container body 142 form a concave lens.

[0067] Preferably, the container body 142 contains a nanofluid frequency-distributing liquid with propylene glycol-CoSO4 as the base liquid and Ag@SiO2 as nanoparticles, and the container body 142 is provided with a liquid exchange port 143.

[0068] Preferably, the synergistic effect of the propylene glycol-CoSO4 base liquid and the nanofluid frequency-separating liquid with Ag@SiO2 nanoparticles can generate photothermal conversion function for light in a preset wavelength band of sunlight. According to an embodiment of the present invention, light with a spectral band of 675~940nm is used for energy storage in the solar panel 16, and light in other wavelength bands is used for photothermal conversion function for light in a preset wavelength band of sunlight by the synergistic effect of the base liquid and the nanofluid frequency-separating liquid, thereby improving the utilization rate of solar energy. After the frequency-separating liquid absorbs the heat of the low-frequency and high-frequency bands of sunlight, the solar panel 16 will not easily overheat and affect its working efficiency.

[0069] Preferred, such as Figure 6 As shown, the reflector 18 includes a reflective mirror surface 181 and a mirror surface clamping device 182;

[0070] The mirror clamping device 182 has a square slot. Two mirror clamping devices 182 are fixed on both sides of the reflective mirror 181 through the square slot. The mirror clamping device 182 has a connecting shaft device on its back. The mirror clamping device 182 located on one side of the reflective mirror 181 is used to connect the first gear shaft 123, and the mirror clamping device 182 located on the other side of the reflective mirror 181 is used to connect the second gear shaft 1961.

[0071] Preferred, such as Figure 8 As shown, the pipeline circulation system 2 includes two concave lens-integrated copper pipes 21, a distributor 22, a first flexible hose 231, a second flexible hose 232, several connecting pipes, a first connecting pipe 241, a circulation pump 25, a second connecting pipe 242, a heating copper pipe 26, a heat storage buffer element 29, a first electromagnetic reversing valve 281, and a second electromagnetic reversing valve 282.

[0072] The two concave lens-embedded copper tubes 21 penetrate the container body 142 and are symmetrically distributed along the container body 142. A flow divider 22 is provided at each end of the two concave lens-embedded copper tubes 21. One of the flow dividers 22 is sequentially connected to a first flexible hose 231, a first connecting pipe 241, a circulation pump 25, a second connecting pipe 242, and a heating copper tube 26. The other end of the heating copper tube 26 is connected to the a port of the first electromagnetic reversing valve 281 via a third connecting pipe 243. The b port of the first electromagnetic reversing valve 281 is connected to the second electromagnetic reversing valve 28 via a fifth connecting pipe 245. The c-port of the first electromagnetic reversing valve 281 is connected to the opening at the bottom of the heat storage buffer element 29 through the fourth connecting pipe 244. The b-port of the second electromagnetic reversing valve 282 is connected to the opening at the top of the heat storage buffer element 29 through the sixth connecting pipe 246. The a-port of the second electromagnetic reversing valve 282 is connected to one end of the second movable hose 232 through the seventh connecting pipe 247. The other end of the second movable hose 232 is connected to another distributor 22. The circulating pump 25, the first electromagnetic reversing valve 281, and the second electromagnetic reversing valve 282 are connected to the control device.

[0073] Preferably, the pipeline circulation system 2 is filled with a liquid working fluid.

[0074] Heat flow path within pipe circulation system 2:

[0075] Heat is transferred through the lens container 14 to the concave lens internal copper tube 21, heating the liquid working medium inside the concave lens internal copper tube 21. The liquid working medium carries the heat from the concave lens internal copper tube 21 through one side distributor 22, the second flexible hose 232, the seventh connecting pipe 247, the second solenoid reversing valve 282, the fifth connecting pipe 245, the first solenoid reversing valve 281, the third connecting pipe 243, the heating copper tube 26, the second connecting pipe 242, the first connecting pipe 241, and the first flexible hose 231, and then through the other side distributor 22 to the concave lens internal copper tube 21.

[0076] Preferably, the pipeline circulation system 2 further includes an electric heating tape and heat-conducting fins 27;

[0077] The electric heating cable is wrapped around the heating copper tube 26. The electric heating cable and the heating copper tube 26 are covered with heat-conducting fins 27. The heat-conducting fins 27 can increase the contact area between the copper tube and the air. The heat-conducting fins 27 can conduct heat to the air more quickly, thereby increasing the heat conduction rate in the vacuum chamber 51. The electric heating cable is connected to the control device, which can control the heating temperature of the electric heating cable.

[0078] Preferably, the heating copper tube 26 is an S-shaped copper tube, which improves the heating efficiency of the vacuum chamber 51.

[0079] Preferably, it also includes a gimbal 4;

[0080] The gimbal 4 is mounted on the housing 3, and the solar frequency splitting electric heating module 1 is mounted on the gimbal 4, so that the solar frequency splitting electric heating module 1 can rotate around the axis of the gimbal 4. The gimbal 4 is connected to the control device.

[0081] Preferably, it also includes a photosensor 113;

[0082] The number of photosensitive sensors 113 is a multiple of four. The photosensitive sensors 113 are respectively installed at the midpoint of each side of the rectangular frame. The photosensitive sensors 113 are connected to the control device. Each photosensitive sensor 113 transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of the photosensitive sensors 113 on each opposite side of the lens movable frame 112, thereby controlling the drive servo motor 13 and the gimbal 4 in real time, so that the light intensity of each opposite side of the photosensitive sensors 113 is basically the same, so that the sunlight can be perpendicularly incident on the Fresnel lens 111 in the solar frequency division electric heating module 1 in real time.

[0083] Preferred, such as Figure 9 As shown, the vacuum low-temperature drying module 5 includes a vacuum chamber 51, a vacuum pump 53, a collection device 54, a drying rack 55, a third electromagnetic reversing valve 56, and a temperature sensor.

[0084] The vacuum chamber 51 is equipped with a feed inlet and a feed door. When the feed door is closed, the vacuum chamber 51 is a fully sealed container. The vacuum chamber 51 is installed inside the shell 3. The heating copper tube 26 is installed below the vacuum chamber 51. A drying rack 55 is installed inside the vacuum chamber 51, and the material to be dried can be placed on the drying rack 55. The vacuum pump 53 and the collecting device 54 are installed on the inner wall of the shell 3 or the outer wall of the vacuum chamber 51. The air inlet of the vacuum pump 53 is connected to the c port of the third electromagnetic reversing valve 56, and the a port of the third electromagnetic reversing valve 56 is connected to the air extraction port on the vacuum chamber 51. The outlet of the vacuum pump 53 is connected to the collecting device 54. A temperature sensor is installed inside the vacuum chamber 51, and the vacuum pump 53 and the temperature sensor are connected to the control device. During operation, the seeds are placed on the drying rack 55 of the vacuum chamber 51, the feed door is closed, and the control device controls the vacuum pump 53 to create a vacuum.

[0085] Preferably, the vacuum low-temperature drying module 5 further includes a condenser 52;

[0086] The condenser 52 is connected to the outlet of the vacuum pump 53, and a collection device 54 is provided at the outlet of the condenser 52. During operation, water vapor in the vacuum chamber 51 enters the condenser 52 through the vacuum pump 53 for condensation, and the condensed liquid water is stored in the collection device 54.

[0087] A control method for the above-mentioned rapeseed drying apparatus includes the following steps:

[0088] Sunlight enters the solar frequency-divided electric heating module 1, which converts solar energy into electrical and thermal energy through solar frequency division. The solar frequency-divided electric heating module 1 stores the electrical energy and transfers the thermal energy to the pipeline circulation system 2. The control device heats the rapeseed in the vacuum low-temperature drying module 5 by controlling the pipeline circulation system 2 and the vacuum low-temperature drying module 5.

[0089] The above scheme also includes the following steps:

[0090] Each photosensitive sensor 113 transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of each opposite photosensitive sensor 113 on the lens movable frame 112, thereby controlling the drive servo motor 13 and the gimbal 4 in real time, so that the light intensity values ​​detected by each opposite photosensitive sensor 113 are basically consistent. Preferably, the light intensity values ​​detected by the photosensitive sensor 113 can be set to the nearest whole number. For example, the light intensity value detected by the opposite photosensitive sensors is 113. This shows that the light intensity values ​​detected by the opposite photosensitive sensors are basically consistent, so that sunlight can be incident perpendicularly on the Fresnel lens 111 in the solar frequency-division electric heating module 1 in real time.

[0091] The above solution specifically includes the following steps:

[0092] Step S1: As Figure 12 , Figure 13 As shown, during operation, when all photosensitive sensors 113 detect that the light intensity reaches the preset value, the control device controls the connection of port a and port b of the first electromagnetic reversing valve 281, the connection of port a and port c of the second electromagnetic reversing valve 282, the connection of port a and port c of the third electromagnetic reversing valve 56, and the energization of the circulation pump 25. At this time, the fifth connecting pipe 245 and the third connecting pipe 243 are in a connected state. The sunlight is converted into electrical energy and heat energy through the solar frequency splitting electrothermal combined power supply module 1. The electrical energy is stored in the solar panel 16. The solar panel 16 supplies power to the control device, the vacuum low temperature drying module 5 and the drive servo motor 13. The heat energy is conducted to the heating copper pipe 26 through the concave lens built-in copper pipe 21. The heating copper pipe 26 heats the rapeseed on the drying rack 55 in the vacuum chamber 51.

[0093] Step S2: When not in operation, when all photosensitive sensors 113 detect that the light intensity has reached the preset value, the control device controls the first electromagnetic reversing valve 281 and the third electromagnetic reversing valve 56 to be de-energized, the control device controls the second electromagnetic reversing valve 282 to connect port a and port b, and the circulation pump 25 to be energized. At this time, the sixth connecting pipe 246 and the heat storage buffer element 29 are in a connected state. The sunlight is converted into electrical energy and light energy through the solar frequency splitting electrothermal cogeneration module 1. The electrical energy is stored in the solar panel 16, and the heat energy is conducted to the heat storage buffer element 29 through the heat conduction of the copper tube 21 built into the concave lens for heat storage.

[0094] Step S3: During operation, when all photosensitive sensors 113 detect that the light intensity has not reached the preset value, the control device controls the connection of ports a and b of the second electromagnetic reversing valve 282, ports a and c of the first electromagnetic reversing valve 281, and ports a and c of the third electromagnetic reversing valve 56, and energizes the circulating pump 25. At this time, the fifth connecting pipe 245 and the third connecting pipe 243 are in a disconnected state, while the sixth connecting pipe 246, the fourth connecting pipe 244, and the third connecting pipe 243 are in a connected state. Sunlight is converted into electrical energy and light energy through the solar frequency-dividing electrothermal cogeneration module 1. The electrical energy is stored in the solar panel 16, and the solar cells... The board 16 supplies power to the control device, the vacuum low-temperature drying module 5 and the drive servo motor 13. The heat energy is transferred to the heat storage buffer element 29 through the heat conduction of the copper tube 21 built into the concave lens. The heat storage buffer element 29 supplies heat to the pipeline circulation system 2. The control device turns on the electric heating tape. The temperature sensor in the vacuum low-temperature drying module 5 transmits the detected temperature to the control device in real time. The control device compares the temperature value with the preset value to control the heating temperature of the electric heating tape, so that the temperature inside the vacuum chamber 51 of the vacuum low-temperature drying module 5 remains constant within the preset range, so that the temperature inside the vacuum chamber 51 is always within the optimal rapeseed drying temperature range.

[0095] Step S4: When not in operation, when all photosensitive sensors 113 detect that the light intensity has not reached the preset value, the first electromagnetic reversing valve 281, the second electromagnetic reversing valve 282, the third electromagnetic reversing valve 56, and the circulating pump 25 are de-energized.

[0096] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0097] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapeseed drying device, characterized in that, It includes a solar frequency-division electric heating module (1), a pipeline circulation system (2), a shell (3), a vacuum low-temperature drying module (5), and a control device; The vacuum low-temperature drying module (5) is installed inside the shell (3), the solar frequency splitting electric heating module (1) is installed on the shell (3), and the pipeline circulation system (2) is connected to the vacuum low-temperature drying module (5) and the solar frequency splitting electric heating module (1) respectively. The solar frequency splitting electric heating module (1) is used to collect solar energy and convert solar energy into electrical energy and heat energy through solar frequency splitting. The solar frequency splitting electric heating module (1) stores electrical energy and transmits heat energy to the pipeline circulation system (2) for heating the rapeseed in the vacuum low-temperature drying module (5). The control device is connected to the solar frequency splitting electric heating module (1), the vacuum low-temperature drying module (5) and the pipeline circulation system (2) respectively. The solar frequency-division electric heating module (1) includes a Fresnel lens (111), a movable lens frame (112), a drive gear set (12), a drive servo motor (13), a lens container (14), a frame (15), a solar panel (16), a movable base plate (17), a reflector (18), a transmission gear set (19), and a battery. The Fresnel lens (111) is disposed in the lens movable frame (112). One side of the lens movable frame (112) is rotatably connected to the frame frame (15) via a drive gear set (12), and the other side of the lens movable frame (112) is rotatably connected to the frame frame (15) via a transmission gear set (19). The drive gear set (12) is connected to the drive servo motor (13), and the drive servo motor (13) is connected to the control device. The drive servo motor (13) is mounted on the frame frame (15), and the frame frame (15) is disposed on the movable base plate (17). The movable base plate (17) is connected to the housing (3). The mirror (18) is located below the Fresnel lens (111). The two sides of the mirror (18) are rotatably connected to the frame (15). The transmission gear set (19) is connected to one side of the mirror (18). The transmission gear set (19) is used to drive the mirror (18) to rotate. The lens container (14) and the solar panel (16) are distributed vertically and are both located on the inner side of the lower part of the frame (15). The lens container (14) is located below the mirror (18). A storage battery is installed at the solar panel (16). The storage battery is connected to the solar panel (16) and connected to the control device. The lens container (14) includes a concave cover (141) and a container body (142). The concave cover (141) is installed on the container body (142). Both the concave cover (141) and the container body (142) are made of transparent material. The concave cover (141) and the container body (142) together form a concave lens. The container (142) contains a frequency-dividing liquid, which is used to divide solar energy into frequencies. The container (142) is provided with a liquid exchange port (143).

2. The rapeseed drying apparatus according to claim 1, characterized in that, The transmission gear set (19) includes a first transmission gear (192), a second transmission gear (193), a third transmission gear (194), and a fourth transmission gear (195). The first transmission gear (192) is mounted on the frame (15) via the second gear shaft (1961). The first transmission gear (192) is supported by the third bearing seat (1911). The third transmission gear (194) is mounted on the frame (15) via the third gear shaft (1962). The third transmission gear (194) is supported by the fifth bearing seat (1913). The lens movable frame (112) is rotatably connected to the frame (15) via the third gear shaft (1962), so that the lens movable frame (112) can rotate around the common axis of the drive gear set (12) and the third gear shaft (1962). The axis rotates, one end of the reflector (18) is rotatably connected to the frame (15) through the first gear shaft (123), and the other end of the reflector (18) is rotatably connected to the frame (15) through the second gear shaft (1961), so that the reflector (18) can rotate around the common axis of the first gear shaft (123) and the second gear shaft (1961). The second transmission gear (193) and the fourth transmission gear (195) are coaxially connected through the fourth gear shaft (1963). The first transmission gear (192) meshes with the second transmission gear (193), and the fourth transmission gear (195) meshes with the third transmission gear (194).

3. The rapeseed drying apparatus according to claim 2, characterized in that, The first transmission gear (192), the second transmission gear (193), the third transmission gear (194), and the fourth transmission gear (195) have the same module and a gear ratio of 4:2:3:3, which makes the first transmission gear (192) and the third transmission gear (194) coaxial, in the same direction, and at different speeds, with a speed ratio of 1:

2.

4. The rapeseed drying apparatus according to claim 1, characterized in that, It also includes a gimbal (4) and a photosensitive sensor (113). The gimbal (4) is mounted on the housing (3), the solar frequency splitting electric heating module (1) is mounted on the gimbal (4), and the gimbal (4) is connected to the control device; The photosensitive sensors (113) are respectively installed at the midpoint of each side of the lens movable frame (112). The photosensitive sensors (113) are connected to the control device. Each photosensitive sensor (113) transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of the photosensitive sensors (113) on each opposite side of the lens movable frame (112) and controls the drive servo motor (13) and the gimbal (4) in real time so that the light intensity of each opposite side photosensitive sensor (113) is consistent, so that the sunlight can be incident perpendicularly on the Fresnel lens (111) in the solar frequency-division electric heating module (1) in real time.

5. The rapeseed drying apparatus according to claim 1, characterized in that, The vacuum low-temperature drying module (5) includes a vacuum chamber (51), a vacuum pump (53), a collection device (54), a drying rack (55), a third electromagnetic reversing valve (56), and a temperature sensor; The vacuum chamber (51) is provided with a feed inlet and a feed door. When the feed door is closed, the vacuum chamber (51) is a fully sealed container. The vacuum chamber (51) is installed inside the shell (3). A drying rack (55) is provided inside the vacuum chamber (51). The vacuum pump (53) and the collection device (54) are installed on the inner wall of the shell (3) or the outer wall of the vacuum chamber (51). The air inlet of the vacuum pump (53) is connected to the c port of the third electromagnetic reversing valve (56). The a port of the third electromagnetic reversing valve (56) is connected to the air extraction hole on the vacuum chamber (51). The outlet of the vacuum pump (53) is connected to the collection device (54). The temperature sensor is installed inside the vacuum chamber (51). The temperature sensor is used to detect the temperature of the vacuum chamber (51) and transmit it to the control device. The vacuum pump (53), the third electromagnetic reversing valve (56), the temperature sensor and the control device are connected.

6. The rapeseed drying apparatus according to claim 1, characterized in that, The pipeline circulation system (2) includes several concave lens-embedded copper tubes (21), a distributor (22), an electric heating cable, a first flexible hose (231), a second flexible hose (232), a first connecting pipe (241), a circulation pump (25), a second connecting pipe (242), a heating copper tube (26), a heat storage buffer element (29), a first electromagnetic reversing valve (281), and a second electromagnetic reversing valve (282); The concave lens-embedded copper tube (21) is connected to the solar frequency-division electric heating module (1). A shunt (22) is provided at each of the left and right ends of the concave lens-embedded copper tube (21). One of the shunts (22) is sequentially connected to a first flexible hose (231), a first connecting pipe (241), a circulation pump (25), a second connecting pipe (242), and one end of a heating copper tube (26). An electric heating tape is wrapped around the heating copper tube (26). The other end of the heating copper tube (26) is connected to the a port of the first electromagnetic reversing valve (281) via a third connecting pipe (243). The b port of the first electromagnetic reversing valve (281) is connected to the second electromagnetic reversing valve via a fifth connecting pipe (245). The c port of the reversing valve (282), the c port of the first electromagnetic reversing valve (281) are connected to the opening at the bottom of the heat storage buffer element (29) through the fourth connecting pipe (244), the b port of the second electromagnetic reversing valve (282) is connected to the opening at the top of the heat storage buffer element (29) through the sixth connecting pipe (246), the a port of the second electromagnetic reversing valve (282) is connected to one end of the second movable hose (232) through the seventh connecting pipe (247), the other end of the second movable hose (232) is connected to another distributor (22), and the circulating pump (25), the first electromagnetic reversing valve (281), and the second electromagnetic reversing valve (282) are respectively connected to the control device.

7. A control method for the rapeseed drying apparatus according to any one of claims 1-6, characterized in that, Includes the following steps: The solar frequency splitting electric heating module (1) converts solar energy into electrical energy and heat energy through solar frequency splitting. The solar frequency splitting electric heating module (1) stores electrical energy and transmits heat energy to the pipeline circulation system (2). The control device heats the rapeseed in the vacuum low temperature drying module (5) by controlling the pipeline circulation system (2) and the vacuum low temperature drying module (5).

8. The control method for the rapeseed drying apparatus according to claim 7, characterized in that, It also includes the following steps: Each photosensitive sensor (113) transmits the monitored light intensity to the control device in real time. The control device compares the light intensity values ​​of each opposite photosensitive sensor (113) of the lens movable frame (112) and controls the drive servo (13) and gimbal (4) in real time so that the light intensity of each opposite photosensitive sensor (113) is consistent, so that the sunlight can be incident perpendicularly on the Fresnel lens (111) in the solar frequency division electric heating module (1) in real time.

9. The control method for the rapeseed drying apparatus according to claim 7, characterized in that, Specifically, the following steps are included: Step S1: During operation, when each photosensitive sensor (113) detects that the light intensity has reached the preset value, the control device controls the first electromagnetic reversing valve (281) to connect port a and port b, the second electromagnetic reversing valve (282) to connect port a and port c, the third electromagnetic reversing valve (56) to connect port a and port c, and the circulating pump (25) to be powered on. At this time, the fifth connecting pipe (245) and the third connecting pipe (243) are in a connected state. The sunlight is converted into electrical energy and heat energy through the solar frequency splitting electric heating module (1). The electrical energy is stored in the solar panel (16). The solar panel (16) supplies power to the control device, the vacuum low temperature drying module (5) and the drive servo motor (13). The heat energy is conducted to the heating copper pipe (26) through the concave lens built-in copper pipe (21). The heating copper pipe (26) heats the rapeseed on the drying rack (55) in the vacuum box (51). Step S2: When not in operation, when all photosensitive sensors (113) detect that the light intensity reaches the preset value, the control device controls the first electromagnetic reversing valve (281) and the third electromagnetic reversing valve (56) to be de-energized, and the control device controls the a port and b port of the second electromagnetic reversing valve (282) to be connected and the circulation pump (25) to be energized. At this time, the sixth connecting pipe (246) and the heat storage buffer element (29) are in a connected state. The sunlight is converted into electrical energy and light energy through the solar frequency splitting electric heating module (1). The electrical energy is stored in the solar panel (16), and the heat energy is conducted to the heat storage buffer element (29) through the heat conduction of the copper tube (21) built into the concave lens for heat storage. Step S3: During operation, when all photosensitive sensors (113) detect that the light intensity has not reached the preset value, the control device controls the connection of port a and port b of the second electromagnetic reversing valve (282), the connection of port a and port c of the first electromagnetic reversing valve (281), the connection of port a and port c of the third electromagnetic reversing valve (56), and the energization of the circulating pump (25). At this time, the fifth connecting pipe (245) and the third connecting pipe (243) are in a disconnected state, and the sixth connecting pipe (246), the fourth connecting pipe (244), and the third connecting pipe (243) are in a connected state. The sunlight is converted into electrical energy and light energy through the solar frequency-divided electric heating and power supply module (1), and the electrical energy is stored. In the solar panel (16), the solar panel (16) supplies power to the control device, the vacuum low-temperature drying module (5) and the drive servo motor (13). The heat energy is transferred to the heat storage buffer element (29) through the heat conduction of the copper tube (21) built into the concave lens. The heat storage buffer element (29) supplies heat to the pipeline circulation system (2). The control device turns on the electric heating tape. The temperature sensor in the vacuum low-temperature drying module (5) transmits the detected temperature to the control device in real time. The control device compares the temperature value with the preset value, thereby controlling the heating temperature of the electric heating tape, so that the temperature in the vacuum chamber (51) of the vacuum low-temperature drying module (5) remains constant within the preset range. Step S4: When not in operation, when each photosensitive sensor (113) detects that the light intensity has not reached the preset value, the first electromagnetic reversing valve (281), the second electromagnetic reversing valve (282), the third electromagnetic reversing valve (56), and the circulating pump (25) are de-energized.

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