CN108106903B - Sample air-drying device for efficiently air-drying soil sample - Google Patents
Sample air-drying device for efficiently air-drying soil sample Download PDFInfo
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- CN108106903B CN108106903B CN201810010470.4A CN201810010470A CN108106903B CN 108106903 B CN108106903 B CN 108106903B CN 201810010470 A CN201810010470 A CN 201810010470A CN 108106903 B CN108106903 B CN 108106903B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract
The invention discloses a sample air-drying device for efficiently air-drying a soil sample, which mainly comprises a box body, an air-drying disc, a holding disc, a rolling device, a pressure sensor, a power supply device, a control device and a temperature/humidity sensor; the box body comprises an air drying box, a control box and a device box, and a bearing frame is arranged in the air drying box; a plurality of air drying plates are arranged; 12-20 holding trays are arranged; the number of the rolling devices is 12-20; the pressure sensor is arranged in the control box and is connected with the pressure sensing probe; the power supply device provides power for the used electric appliance; the control device comprises a controller and a touch screen, and the controller is connected with the used electric appliance; the temperature/humidity sensor is arranged in the control box, and a detection probe of the temperature/humidity sensor is positioned in the air drying box; the invention has simple structure and can air-dry the soil sample quickly and efficiently.
Description
Technical Field
The invention relates to the technical field of sample detection, in particular to a sample air-drying device for efficiently air-drying a soil sample.
Background
Soil pollutants can be broadly classified into two broad categories, inorganic pollutants and organic pollutants. The inorganic pollutants mainly comprise acid, alkali, heavy metal, salts, compounds of radioactive elements cesium and strontium, compounds containing arsenic, selenium and fluorine, and the like. The organic pollutants mainly comprise organic pesticides, phenols, cyanides, petroleum, synthetic detergents, harmful microorganisms brought by municipal sewage, sludge and animal manure, and the like. When the soil contains excessive harmful substances and exceeds the self-cleaning capacity of the soil, the composition, the structure and the function of the soil are changed, the activity of microorganisms is inhibited, and the harmful substances or decomposition products thereof are gradually accumulated in the soil and are indirectly absorbed by the human body through the soil → plants → the human body or through the soil → water → the human body, so that the degree of harming the health of the human body is reached, namely the soil pollution.
Soil remediation is a technical measure to restore normal function to contaminated soil. In the soil remediation industry, the existing soil remediation technologies can be more than one hundred, the common technologies can be more than ten, and the existing soil remediation technologies can be roughly divided into three methods, namely physical methods, chemical methods and biological methods. Since the 80 s in the 20 th century, many countries in the world, especially developed countries, have established and developed contaminated soil remediation and remediation programs, thus forming an emerging soil remediation industry.
At present, the soil remediation technology in China stays at the laboratory level for a long time, and economic and effective industrialized mature experiences for soil remediation are relatively lacking. Therefore, the urgent requirement for improving the soil environment in China when the laboratory technology is accelerated to move to the engineering site is met.
Before the soil sample is detected, the collected soil sample is dried in the air, and then is ground and sieved for detection. A large amount of soil samples need a large air drying place for air drying, and a large amount of samples are placed in containers. A sample to be air-dried is placed on a sampling enamel plate in a general soil sample detection laboratory. The small-sized enamel plate is used for placing a small amount of samples, when the amount of the samples needed for detection is large, more soil is piled in the small-sized enamel plate and is difficult to air dry, one sample is placed in different sample plates, and the samples are easy to mix when the amount of the samples is large. A large enamel plate is used, so that the occupied space is large; some laboratories spread the sample on clean paper to air, so that the occupied space is large, and the sample is easy to mix with dishes and cross-contaminate; the air drying box device in the prior art is expensive due to the fact that the internal structure of the air drying box device is too complex, and the air drying box device is limited by the sample chamber, so that the number of samples dried at one time is small.
Disclosure of Invention
Aiming at the problems, the invention provides the sample air-drying device which is simple in structure and capable of efficiently air-drying the soil sample with a large number of air-dried samples.
The design scheme of the invention is as follows: a sample air-drying device for efficiently air-drying a soil sample mainly comprises a box body, an air-drying disk, a containing disk, a rolling device, a pressure sensor, a power supply device, a control device and a temperature/humidity sensor;
the box body comprises an air drying box, a control box and a device box, and a bearing frame is arranged in the air drying box; the device box is positioned at the bottom end of the box body, the fan is arranged in the device box, the air drying box is positioned above the device box, the control box is positioned at the top end of the box body, the air drying box is provided with a box door, and the box door is provided with a handle;
the air drying plates are provided with a plurality of air drying plates, each air drying plate comprises a plate body, four pulleys and four superposed support rods, the plate body is a rectangular shallow plate, the plate body is provided with vent holes, the four pulleys are respectively arranged at four corners of the lower surface of the plate body, and the four superposed support rods are respectively arranged at the front and rear ends of the left and right side surfaces of the plate body;
12-20 containing trays are arranged, and each containing tray is provided with a containing groove, a sliding groove, an air outlet, a pressure sensing probe and a heating plate; the containing discs are uniformly arranged on the left side and the right side of the bearing frame and are movably connected with the air drying disc through pulleys and sliding chutes; the device comprises a containing tray, a fan, a heating plate, a plurality of air outlets, a plurality of air ducts, a plurality of air outlets, a plurality of air ducts and a plurality of air outlets, wherein the containing tray is arranged on the upper surface of the containing tray, the number of the air ducts is two, the air outlets are respectively arranged at the lower ends of the left side and the right side of the containing tray, the number of the air outlets is 4-6, the air outlets are uniformly arranged at the;
the number of the rolling devices is 12-20, and each rolling device comprises a motor, a slide bar, a roller and a clamping device; the rolling devices are uniformly arranged on the left side and the right side of the bearing frame, the number of the rolling devices is consistent with that of the containing discs, and each rolling device is positioned above the corresponding containing disc; the motor is arranged on the bearing frame, the sliding rod is arranged on the motor, the roller is connected with the sliding rod through the clamping device, and the motor provides power for the clamping device;
the pressure sensor is arranged in the control box and is connected with the pressure sensing probe;
the power supply device is arranged in the device box and provides power for the fan, the heating plate, the rolling device, the pressure sensor and the temperature/humidity sensor;
the control device comprises a controller and a touch screen, the controller is arranged in the control box and is connected with the fan, the heating plate, the rolling device, the pressure sensor and the temperature/humidity sensor, the touch screen is arranged at the position close to the upper end of the outer surface of the box body, and the touch screen is connected with the controller;
the temperature/humidity sensor is arranged in the control box, and a detection probe of the temperature/humidity sensor is positioned in the air drying box.
Furthermore, a circulating fan is arranged in the control box; the circulating fan can effectively discharge the humid air flow in the air drying box, and the air drying speed can be accelerated.
Furthermore, a filter screen device is arranged at the air vent of the circulating fan and is movably connected to the upper end of the control box; the filter screen device can effectively treat the discharged air flow, and avoids air pollution caused by pollutants in the soil sample.
Furthermore, an electronic control valve is arranged at the joint of the fan and the air outlet; the switch can be controlled according to whether the air drying plate is arranged on the containing plate or not, and energy consumption can be effectively saved.
Further, the air drying disc can be used independently, and can be placed in a single layer or in a multi-layer overlapping mode through the overlapping support rods; when necessary, adopt this kind of superimposed mode to carry out natural air-drying outside air-drying device, both increased and air-dried sample volume, practiced thrift the space again, practiced thrift the energy consumption.
Further, the air drying disc further comprises covering cloth and two inserting and buckling devices, wherein each inserting and buckling device comprises a plug and a slot; one end of the cover cloth is movably connected to the rear side face of the tray body, the plugs are distributed on two sides of the other end of the cover cloth, and the slots are distributed on the left end and the right end of the front side face of the tray body; when the soil sample is air-dried, the soil sample can be effectively prevented from being lost and confused due to wind power, so that the experimental structure can be directly influenced; the swing joint of drop cloth can wash after the sample air-dries at every turn for next air-dry structure is more high-efficient.
Furthermore, the tray body is made of polyethylene; the polyethylene material is easy to process, and the disk body is light, easily piles up and places.
Furthermore, a code inserting plate is arranged on the tray body; when carrying out large-scale soil sample and air-drying, can mark, can avoid obscuring effectively, avoid producing inaccurate influence to the experiment structure.
The working principle of the invention is as follows: spreading a soil sample on a disc body, inserting the soil sample into the slot through the plug to cover the cover cloth, labeling, and placing the label paper slip into the label inserting plate; the air drying plate is placed on the containing plate by being placed in the sliding groove through the pulley, and after the pressure sensing probe senses pressure, information is transmitted to the pressure sensor and then transmitted to the controller through the pressure sensor; the controller controls the fan to work and opens the electronic control valve and the heating plate on the pressure-sensing probe pressure-bearing containing disc to work; when the air drying is carried out, the controller can control the rolling device to roll the soil sample in the air drying when the soil sample is half-dry, and large soil blocks (particularly clay soil samples) need to be rolled and crushed so as not to be completely dried and then to be hard blocks which are difficult to grind; controlling a temperature/humidity sensor to detect, and controlling a circulating fan to work periodically; the user can know the internal temperature and humidity through the touch screen, and can adjust the temperature and set the time through the touch screen.
When carrying out large-scale soil sample and air-drying, can be with soil sample tiling on the disk body, will air-dry the dish again and carry out one deck stack and place and air-dry in the air-dry case outside.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the air drying disc with the cover cloth is adopted, so that the problems of confusion and pollution caused by the fact that soil flies with wind can be effectively avoided in the air drying process; meanwhile, the rolling device can roll the soil sample in air drying when the soil sample is half dry, can crush large soil blocks, and is more beneficial to a later grinding program; meanwhile, the invention adopts heating and air drying in batches, and only carries out wind power and heating power on the air drying disc with the soil sample, thereby greatly saving energy consumption; meanwhile, the polyethylene disc with the superposed support rods is used as a tool for air-drying and airing the soil sample, the polyethylene disc can be used independently, the soil sample is paved in the disc, each layer of sample is thin and thin, the samples can be superposed layer by layer, the samples are easy to air-dry, and the space and the field are saved; the invention has simple structure and can air-dry the soil sample quickly and efficiently.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is an external structural view of the present invention;
FIG. 3 is a front view of the air drying tray of the present invention;
FIG. 4 is a schematic structural view of a tray of the present invention;
FIG. 5 is a schematic view of the construction of the laminating apparatus of the present invention;
FIG. 6 is a schematic structural view of an air-drying tray of the present invention;
FIG. 7 is a block diagram of the present invention air drying tray when used alone;
FIG. 8 is a block diagram of the present invention;
wherein, 1-box body, 11-air drying box, 110-box door, 12-control box, 13-device box, 130-fan, 14-bearing frame, 2-air drying plate, 21-disk body, 210-code inserting plate, 22-pulley, 23-superposed brace rod, 24-cover cloth, 25-inserting and buckling device, 251-plug, 252-slot, 3-holding plate, 31-holding groove, 32-sliding groove, 33-air outlet, 34-pressure sensing probe, 35-heating plate, 36-electronic control valve, 4-rolling device, 41-motor, 42-sliding rod, 43-roller, 44-clamping device, 5-pressure sensor, 6-power supply device, 7-control device, 71-controller, 72-touch screen, 8-temperature/humidity sensor, 9-circulating fan, 91-filter screen device.
Detailed Description
Example 1: as shown in fig. 1-6, the sample air-drying device for efficiently air-drying a soil sample mainly comprises a box body 1, an air-drying tray 2, a containing tray 3, a rolling device 4, a pressure sensor 5, a power supply device 6, a control device 7 and a temperature/humidity sensor 8;
the box body 1 comprises an air drying box 11, a control box 12 and a device box 13, and a bearing frame 14 is arranged in the air drying box 11; a circulating fan 9 is arranged in the control box 12, a filter screen device 91 is arranged at an air vent of the circulating fan 9, and the filter screen device 91 is movably connected to the upper end of the control box 12; the device box 13 is positioned at the bottom end of the box body 1, the fan 130 is arranged in the device box 13, the air drying box 11 is positioned above the device box 13, the control box 12 is positioned at the top end of the box body 1, the air drying box 11 is provided with a box door 110, and the box door 110 is provided with a handle;
14 air-drying trays 2 are provided, each air-drying tray 2 comprises a tray body 21, a pulley 22 superposed stay bar 23, a cover cloth 24 and a buckle device 25, the tray body 21 is made of polyethylene, the tray body 21 is a rectangular shallow tray, and the tray body 21 is provided with vent holes and a code inserting plate 210; four pulleys 22 are respectively arranged at four corners of the lower surface of the tray body 21, and four stacking support rods 23 are respectively arranged at the front and rear ends of the left and right side surfaces of the tray body 21; two buckle devices 25 are provided, each buckle device 25 includes a plug 251 and a slot 252; one end of the cover cloth 24 is movably connected with the rear side of the tray body 21, the plugs 251 are distributed on two sides of the other end of the cover cloth 24, and the slots 252 are distributed at the left end and the right end of the front side of the tray body 21;
14 containing trays 3 are provided, and each containing tray 3 is provided with a containing groove 31, a chute 32, an air outlet 33, a pressure sensing probe 34 and a heating plate 35; the containing discs 3 are uniformly arranged on the left side and the right side of the bearing frame 14, and the containing discs 3 are movably connected with the air drying disc 2 through the pulleys 22 and the chutes 32; the two containing grooves 31 are arranged on the upper surface of the containing disc 3, the two sliding grooves 32 are respectively arranged at the lower ends of the left side and the right side of the containing groove 31, 4-6 air outlets 33 are uniformly arranged at the lower end of the containing groove 31 and positioned between the sliding grooves 32, the air outlets 33 are connected with the fan 130 through air guide pipes, an electronic control valve 36 is arranged at the joint of the fan 130 and the air outlets 33, and the heating plate 35 is arranged at the lower end of the containing disc 3;
the number of the rolling devices 4 is 14, and each rolling device 4 comprises a motor 41, a slide rod 42, a roller 43 and a clamping device 44; the rolling devices 4 are uniformly arranged on the left side and the right side of the bearing frame 14, and each rolling device 4 is positioned above the corresponding containing disc 3; the motor 41 is arranged on the bearing frame 14, the sliding rod 42 is arranged on the motor 41, the roller 43 is connected with the sliding rod 42 through the clamping device 44, and the motor 41 provides power for the clamping device 44;
the pressure sensor 5 is arranged in the control box 12, and the pressure sensor 5 is connected with the pressure sensing probe 34;
the power supply device 6 is arranged in the device box 13, and the power supply device 6 supplies power to the fan 130, the heating plate 35, the electronic control valve 36, the rolling device 4, the pressure sensor 5, the temperature/humidity sensor 8 and the circulating fan 9;
the control device 7 comprises a controller 71 and a touch screen 72, the controller 71 is arranged in the control box 12, the touch screen 72 is arranged at the position close to the upper end of the outer surface of the box body 1, the controller 71 is connected with the fan 130, the heating plate 35, the electronic control valve 36, the rolling device 4, the pressure sensor 5, the temperature/humidity sensor 8 and the circulating fan 9, and the touch screen 72 is connected with the controller 71;
the temperature/humidity sensor 8 is disposed in the control box 12, and a detection probe of the temperature/humidity sensor 8 is located in the air drying box 11.
The air drying disc 2 can be used independently, and can be placed in a single layer or in a multi-layer overlapping mode through the overlapping support rods 23; when necessary, adopt this kind of superimposed mode to carry out natural air-drying outside air-drying device, both increased and air-dried sample volume, practiced thrift the space again, practiced thrift the energy consumption.
The working principle of the invention is as follows: spreading the soil sample on the tray body 21, inserting the soil sample into the slot 252 through the plug 251 to cover the covering cloth 24, marking, and placing the code paper strip into the code inserting plate 210; the air drying plate 2 is placed on the containing plate 3 by being placed in the sliding groove 32 through the pulley 22, and after the pressure sensing probe 34 senses the pressure, the information is transmitted to the pressure sensor 5, and then the information is transmitted to the controller 71 by the pressure sensor 5; the controller 71 controls the fan 130 to work, and opens the electronic control valve 36 and the heating plate 35 on the pressure-sensing probe 34 on the pressure-bearing holding tray 3 to work; when the air drying is performed, the controller 71 controls the rolling device 4 to roll the soil sample during the air drying when the soil sample is half-dry, and large soil blocks (particularly clay soil samples) need to be rolled up so as not to be completely dried and then to be hard blocks, so that the soil samples are difficult to be finely ground; controlling the temperature/humidity sensor 8 to detect and controlling the circulating fan 9 to work periodically; the user can know the internal temperature and humidity through the touch screen 72, and can adjust the temperature and set the time through the touch screen 72.
When carrying out large-scale soil sample and air-drying, can lay soil sample flat on disk body 21, carry out one deck stack with air-dry dish 2 again and place and air-dry outside the air-dry box.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A sample air-drying device for efficiently air-drying a soil sample is characterized by comprising a box body (1), an air-drying disc (2), a containing disc (3), a rolling device (4), a pressure sensor (5), a power supply device (6), a control device (7) and a temperature/humidity sensor (8);
the box body (1) comprises an air drying box (11), a control box (12) and a device box (13), and a bearing frame (14) is arranged in the air drying box (11); the device box (13) is positioned at the bottom end of the box body (1), the fan (130) is arranged in the device box (13), the air drying box (11) is positioned above the device box (13), the control box (12) is positioned at the top end of the box body (1), the air drying box (11) is provided with a box door (110), and the box door (110) is provided with a handle;
the air drying device is characterized in that the number of the air drying discs (2) is multiple, each air drying disc (2) comprises a disc body (21), pulleys (22) and stacking support rods (23), the disc body (21) is a rectangular shallow disc, vent holes are formed in the disc body (21), the number of the pulleys (22) is four, the four pulleys are respectively arranged at four corners of the lower surface of the disc body (21), and the number of the stacking support rods (23) is four, and the four stacking support rods are respectively arranged at the front end and the rear end of the left side surface and the right side surface of the disc body (21);
12-20 containing trays (3) are arranged, and each containing tray (3) is provided with a containing groove (31), a sliding groove (32), an air outlet (33), a pressure sensing probe (34) and a heating plate (35); the containing discs (3) are uniformly arranged on the left side and the right side of the bearing frame (14), and the containing discs (3) are movably connected with the air drying disc (2) through pulleys (22) and sliding chutes (32); the air drying plate is characterized in that the containing grooves (31) are formed in the upper surface of the containing plate (3), two sliding grooves (32) are formed and are respectively formed in the lower ends of the left side and the right side of the containing grooves (31), 4-6 air outlets (33) are uniformly formed in the lower end of the containing grooves (31) and located between the sliding grooves (32), the air outlets (33) are connected with a fan (130) through air guide pipes, the heating plate (35) is arranged at the lower end of the containing plate (3), and the pressure sensing probes (34) are arranged in the sliding grooves (32) and used for sensing the pressure of the air drying plate (2);
the number of the rolling devices (4) is 12-20, and each rolling device (4) comprises a motor (41), a sliding rod (42), a roller (43) and a clamping device (44); the rolling devices (4) are uniformly arranged on the left side and the right side of the bearing frame (14), the number of the rolling devices (4) is consistent with that of the containing discs (3), and each rolling device (4) is positioned above the corresponding containing disc (3); the motor (41) is arranged on the bearing frame (14), the sliding rod (42) is arranged on the motor (41), the roller (43) is connected with the sliding rod (42) through the clamping device (44), and the motor (41) provides power for the clamping device (44);
the pressure sensor (5) is arranged in the control box (12), and the pressure sensor (5) is connected with the pressure sensing probe (34);
the power supply device (6) is arranged in the device box (13), and the power supply device (6) provides power for the fan (130), the heating plate (35), the rolling device (4), the pressure sensor (5) and the temperature/humidity sensor (8);
the control device (7) comprises a controller (71) and a touch screen (72), the controller (71) is arranged in the control box (12), the controller (71) is connected with the fan (130), the heating plate (35), the rolling device (4), the pressure sensor (5) and the temperature/humidity sensor (8), the touch screen (72) is arranged at the position, close to the upper end, of the outer surface of the box body (1), and the touch screen (72) is connected with the controller (71);
the temperature/humidity sensor (8) is arranged in the control box (12), and a detection probe of the temperature/humidity sensor (8) is positioned in the air drying box (11).
2. A sample air drying device for air drying soil samples with high efficiency according to claim 1, characterized in that a circulating fan (9) is arranged in the control box (12).
3. The sample air-drying device for efficiently air-drying the soil sample according to claim 2, wherein a filter screen device (91) is arranged at an air vent of the circulating fan (9), and the filter screen device (91) is movably connected to the upper end of the control box (12).
4. A sample air-drying device for air-drying soil samples with high efficiency according to claim 1, characterized in that an electronic control valve (36) is arranged at the connection of the air blower (130) and the air outlet (33).
5. A sample air-drying device for air-drying soil samples with high efficiency according to claim 1, characterized in that the air-drying disk (2) can be used alone, can be placed in a single layer, and can also be placed in a multi-layer stacking manner through stacking struts (23).
6. A sample air drying device for air drying soil samples with high efficiency according to claim 1, characterized in that the disc body (21) is made of polyethylene.
7. A sample air drying device for air drying soil samples with high efficiency according to claim 1, characterized in that the pulley (22) is movably connected with the chute (32).
8. A sample air-drying device for air-drying soil samples with high efficiency according to claim 1, characterized in that the disc body (21) is provided with a code inserting plate (210).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810010470.4A CN108106903B (en) | 2018-01-05 | 2018-01-05 | Sample air-drying device for efficiently air-drying soil sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810010470.4A CN108106903B (en) | 2018-01-05 | 2018-01-05 | Sample air-drying device for efficiently air-drying soil sample |
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| CN108106903A CN108106903A (en) | 2018-06-01 |
| CN108106903B true CN108106903B (en) | 2020-04-07 |
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Families Citing this family (2)
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| CN109827818B (en) * | 2019-02-26 | 2021-03-30 | 江苏秋泓环境检测有限公司 | Soil air-drying box |
| CN111257076A (en) * | 2020-02-24 | 2020-06-09 | 重庆中科检测技术服务有限公司 | Pretreatment method for extracting organochlorine pesticide in soil |
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| CN205825604U (en) * | 2016-06-07 | 2016-12-21 | 徐州黎明食品有限公司 | A kind of novel Bulbus Allii dehydrator |
| CN206642808U (en) * | 2017-03-23 | 2017-11-17 | 赣州市淳乡情农业开发有限公司 | A kind of Peel of Navel Orange, which dries, pulverizes integrated box |
| CN107088459A (en) * | 2017-05-17 | 2017-08-25 | 滨海康之源生态农业发展有限公司 | A kind of device for making fig fruit powder |
| CN106989572A (en) * | 2017-05-27 | 2017-07-28 | 江苏省农业科学院 | A kind of soil batch Quick-air-drying device |
| CN107166874A (en) * | 2017-06-03 | 2017-09-15 | 颍上县锡安山米业有限公司 | A kind of even brush rice energy-saving drying device |
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| CN108106903A (en) | 2018-06-01 |
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