Vacuum soil moisture extraction equipment and method

Abstract

A vacuum soil moisture extraction device and method, which relate to the technical field of environmental monitoring, and include a bearing mechanism, a cooling mechanism and a temperature control mechanism. The bearing mechanism includes a carrier, a purging assembly, a vacuum pumping assembly and a connecting pipe. The purging assembly, the vacuum pumping assembly and the connecting pipe are all installed on the carrier. The purging assembly and the vacuum pumping assembly are both connected to the connecting pipe. The purging assembly is used to blow air into the connecting pipe, and the vacuum pumping assembly is used to pump vacuum on the connecting pipe. The two ends of the connecting pipe are respectively used to install a sample tube and a water receiving bottle. The carrier is movably matched with the cooling mechanism and the temperature control mechanism at the same time, so that the carrier has a first position and a second position that can be switched with each other. When in the first position, the cooling mechanism is used to cool the sample tube connected to the connecting pipe. When in the second position, the temperature control mechanism is used to heat the sample tube and cool the water receiving bottle at the same time. This device has high moisture extraction efficiency, small error and high accuracy of test results.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular, to a vacuum soil moisture extraction device and method. Background Art

[0002] Soil moisture extraction is a technique for separating and collecting moisture from soil samples, and this technique has important applications in multiple fields, especially in agriculture, environmental science, geology, and engineering. Soil moisture extraction can be used to determine the soil water content, which is crucial for evaluating the physical properties of the soil, formulating irrigation plans, and studying the dynamic changes of soil moisture; it can also be used for the determination of soil water characteristic curves, evaluation of soil structure and texture, environmental monitoring and pollution research, agricultural and horticultural management, and engineering applications, etc. In the prior art, after obtaining soil samples, manual soil moisture extraction operations are carried out in the laboratory.

[0003] The inventors found in their research that the prior art soil moisture extraction has at least the following disadvantages:

[0004] Manual operation, the extraction process is cumbersome, the labor intensity is high, and the efficiency is low. The process of extracting moisture is time-consuming and laborious and consumes resources such as liquid nitrogen. Summary of the Invention

[0005] The objectives of the present invention include, for example, providing a vacuum soil moisture extraction device and method, which can improve the degree of automation, reduce the labor intensity, improve the operation efficiency, reduce errors, and improve the accuracy of test data.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a vacuum soil moisture extraction device for use in cooperation with a sample tube and a water receiving bottle, including a carrying mechanism, a cooling mechanism, and a temperature control mechanism, wherein:

[0008] The carrying mechanism includes a carrier, a purging assembly, a vacuum pumping assembly, and a connecting pipe; the purging assembly, the vacuum pumping assembly, and the connecting pipe are all installed on the carrier, the purging assembly and the vacuum pumping assembly are both connected to the connecting pipe, the purging assembly is used to blow air into the connecting pipe, and the vacuum pumping assembly is used to pump vacuum for the connecting pipe; both ends of the connecting pipe are respectively used to install the sample tube and the water receiving bottle;

[0009] The carrier is simultaneously movably cooperated with the cooling mechanism and the temperature control mechanism, so that the carrier has a first position and a second position that can be switched with each other. When in the first position, the cooling mechanism is used to cool the sample tube connected to the connecting pipe; when in the second position, the temperature control mechanism is used to heat the sample tube while cooling the water receiving bottle.

[0010] In an alternative embodiment, the carrier includes a first driver, a second driver, and a positioning plate group. The first driver is connected to the second driver, and the second driver is connected to the positioning plate group. The connecting pipe is installed on the positioning plate group. The first driver is configured to drive the second driver and the positioning plate group to rotate synchronously relative to the cooling mechanism and the temperature control mechanism. The second driver is configured to drive the positioning plate group to move up and down relative to the cooling mechanism and the temperature control mechanism.

[0011] In an alternative embodiment, the positioning plate group includes an upper pressing plate and a lower pressing plate. The upper pressing plate and the lower pressing plate are connected and cooperate to clamp the connecting pipe, and both ends of the connecting pipe extend out of the area between the upper pressing plate and the lower pressing plate. The upper pressing plate or the lower pressing plate is connected to the second driver, and the second driver is configured to drive the upper pressing plate and the lower pressing plate to move up and down synchronously.

[0012] In an alternative embodiment, the connecting pipe is arranged as a U-shaped pipe, which includes a first pipe section, a second pipe section, and a third pipe section connected in sequence. The extending direction of the first pipe section is the same as that of the third pipe section. The upper pressing plate and the lower pressing plate cooperate to clamp the second pipe section. The upper pressing plate is located above the lower pressing plate, and both the first pipe section and the third pipe section are located on the side of the upper pressing plate close to the lower pressing plate.

[0013] In an alternative embodiment, an avoidance hole is provided on the lower pressing plate. The first pipe section passes through the avoidance hole, and the third pipe section extends out of the edge of the lower pressing plate. The first pipe section is connected to the water receiving bottle, and the third pipe section is connected to the sample tube.

[0014] In an alternative embodiment, the temperature control mechanism includes an independently arranged heating tank and a cooling tank. A heating cotton is arranged in the heating tank, and the heating cotton is configured to contact the sample tube and heat the sample tube. The cooling tank is used to hold liquid nitrogen for cooling the water receiving bottle.

[0015] In an alternative embodiment, the sample tube is arranged as a bent tube. The sample tube is located outside the water receiving bottle, and the end of the sample tube far from the connecting pipe is arranged outward. The bottom of the sample tube is lower than the bottom of the water receiving bottle.

[0016] In an alternative embodiment, the sample tube is arranged as a bent tube. The sample tube is located outside the water receiving bottle, and the end of the sample tube far from the connecting pipe is arranged outward.

[0017] In an alternative embodiment, a barrier cotton is provided inside the sample tube, and the barrier cotton is used to allow air to pass through during the vacuuming process and prevent the soil sample located inside the sample tube from leaving the sample tube.

[0018] In a second aspect, the present invention provides a method for extracting soil moisture in a vacuum, which is applied to the vacuum soil moisture extraction device described in any one of the foregoing embodiments. The method includes the following steps:

[0019] Step S100: Vent the connecting tube by using the purging assembly;

[0020] Step S200: Install the sample tube and the water receiving bottle at both ends of the connecting tube respectively. After adding a soil sample to the end of the sample tube far from the connecting tube, seal the end of the sample tube far from the connecting tube; use the vacuuming assembly to vacuum the connecting tube, the sample tube and the water receiving bottle;

[0021] Step S300: Cool the sample tube by using the cooling mechanism under the condition that the carrier is in the first position;

[0022] Step S400: Under the condition that the carrier is in the second position, heat the sample tube by using the temperature control mechanism while cooling the water receiving bottle.

[0023] The beneficial effects of the embodiments of the present invention include:

[0024] The vacuum soil moisture extraction device provided in this embodiment integrates the purging assembly, the vacuuming assembly and the connecting tube on the carrier, with a compact structure and a small volume, which is conducive to centralized management. Moreover, the connecting tube is positioned by the carrier, and the position of the connecting tube is stable and reliable. When the sample tube and the water receiving bottle are installed at both ends of the connecting tube, it is not easy to slip, and the installation is time-saving and labor-saving, with high efficiency. When purging and vacuuming the connecting tube, there is no need to perform additional positioning on the connecting tube, and the operation is convenient and flexible. At the same time, the sample tube and the water receiving bottle are positioned by the connecting tube, and their relative positions are more accurate, which is conducive to subsequent moisture extraction operations. By adjusting the position of the carrier, the relative positions of the sample tube and the water receiving bottle relative to the cooling mechanism and the temperature control mechanism can be accurately adjusted, with convenient operation, which is conducive to cooling or heating the sample tube and also conducive to cooling the water receiving bottle. Moreover, through automated operation, less manual participation results in less difference and smaller error in the cooling and heating of the sample tube and the cooling of the water receiving bottle, which can effectively improve the accuracy of the test results. Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0026] Figure 1 Schematic diagram of the vacuum soil moisture extraction device for the embodiments of the present application;

[0027] Figure 2 Partial schematic diagram of the vacuum soil moisture extraction device for the embodiments of the present application;

[0028] Figure 3 Schematic diagram of the pipeline assembly for the embodiments of the present application;

[0029] Figure 4 Schematic diagram of the cooperation of the connecting pipe, water receiving bottle and sample tube for the embodiments of the present application;

[0030] Figure 5 Schematic diagram of the connecting pipe for the embodiments of the present application;

[0031] Figure 6 Schematic diagram of the cooling mechanism and temperature control mechanism for the embodiments of the present application.

[0032] Icon:

[0033] 001 - Sample tube; 011 - Vertical pipe section; 012 - Horizontal pipe section; 013 - Rubber stopper; 014 - Blocking cotton; 015 - Duct; 016 - Cable; 017 - Metal mesh basket; 002 - Water receiving bottle; 100 - Carrying mechanism; 110 - Carrier; 111 - First driver; 112 - Second driver; 113 - Positioning plate group; 1131 - Upper pressure plate; 1132 - Lower pressure plate; 1133 - Avoidance hole; 1134 - Sliding sleeve; 120 - Purge assembly; 121 - Protection box; 122 - Nitrogen tank; 123 - First air pipe; 124 - First valve; 125 - Slide rail; 130 - Vacuum pumping assembly; 131 - Vacuum pump; 132 - Second air pipe; 133 - Second valve; 140 - Pipeline assembly; 141 - Main pipe; 142 - Docking pipe; 143 - Connecting pipe; 1431 - First pipe section; 1432 - Second pipe section; 1433 - Third pipe section; 200 - Cooling mechanism; 300 - Temperature control mechanism; 310 - Heating tank; 320 - Cooling tank; 330 - Heating cotton; 400 - Base. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0036] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the inventive product is habitually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0038] In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0039] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0040] In the prior art, during soil moisture extraction, the entire process is manual operation, with cumbersome operation steps, high labor intensity, low efficiency, and moreover, the operation methods of different operators or the same operator at different times are inconsistent, resulting in large errors. The process of extracting moisture is time-consuming, laborious, and resource-consuming.

[0041] In view of this, the designer provides a vacuum soil moisture extraction device, which reduces the labor intensity, improves the operation efficiency, reduces errors, and improves the accuracy of test results by increasing the degree of automation.

[0042] Please refer to Figures 1-6, this embodiment provides a vacuum soil moisture extraction device for use in conjunction with a sample tube 001 and a water receiving bottle 002. It includes a carrier mechanism 100, a cooling mechanism 200, and a temperature control mechanism 300. The carrier mechanism 100 includes a carrier 110, a purging assembly 120, a vacuum pumping assembly 130, and a connecting pipe 143. The purging assembly 120, the vacuum pumping assembly 130, and the connecting pipe 143 are all installed on the carrier 110. The purging assembly 120 and the vacuum pumping assembly 130 are both connected to the connecting pipe 143. The purging assembly 120 is used to blow air into the connecting pipe 143, and the vacuum pumping assembly 130 is used to evacuate the connecting pipe 143. The two ends of the connecting pipe 143 are respectively used to install the sample tube 001 and the water receiving bottle 002. The carrier 110 is movably engaged with both the cooling mechanism 200 and the temperature control mechanism 300, so that the carrier 110 has a first position and a second position that can be switched with each other. When in the first position, the cooling mechanism 200 is used to cool the sample tube 001 connected to the connecting pipe 143. When in the second position, the temperature control mechanism 300 is used to heat the sample tube 001 while cooling the water receiving bottle 002.

[0043] As described above, the working method of the vacuum soil moisture extraction device provided in this embodiment is as follows:

[0044] First, start the purging assembly 120 and close the vacuum pumping assembly 130 to discharge the debris in the connecting pipe 143. The purging assembly 120 can blow inert gases such as nitrogen into the connecting pipe 143. Then, close the purging assembly 120, and connect the sample tube 001 and the water receiving bottle 002 to the two ports of the connecting pipe 143 respectively, and the connection position is a sealed fit. Add an appropriate amount of soil sample into the sample tube 001 from the port of the sample tube 001 that is far from the connecting pipe 143, and use a sealing plug to seal the port of the sample tube 001 for adding the soil sample. Open the vacuum pumping assembly 130 to evacuate the air in the connecting pipe 143, the sample tube 001, and the water receiving bottle 002, so that the inside is kept in a vacuum state. By evacuating the air, it is beneficial to remove the moisture and impurities in the pipeline air and ensure the purity of the extracted sample. Make the carrier 110 in the first position, and use the cooling mechanism 200 to cool the sample tube 001 and the soil sample therein. At this time, liquid nitrogen can be used to cool the soil sample, which is beneficial to the separation of soil moisture and thus improves the extraction rate of soil moisture. Then, switch the carrier 110 from the first position to the second position, and use the temperature control mechanism 300 to heat the sample tube 001 while cooling the water receiving bottle 002. Liquid nitrogen can be used to cool the water receiving bottle 002, and a heating element can be used to heat the sample tube 001, which can increase the temperature difference and improve the extraction rate of soil moisture.

[0045] It should be understood that integrating the purging assembly 120, the vacuum pumping assembly 130 and the connecting pipe 143 on the carrier 110 results in a compact structure with a small volume, which is conducive to centralized management. The connecting pipe 143 is positioned by relying on the carrier 110, and the position of the connecting pipe 143 is stable and reliable. When the sample tube 001 and the water receiving bottle 002 are installed at both ends of the connecting pipe 143, it is not easy to slip, and the installation is time-saving, labor-saving and efficient. The entire operation process has a high degree of automation, less human intervention, low labor intensity, small error, and can effectively improve the accuracy of test results.

[0046] The following embodiments illustrate the details of the vacuum soil moisture extraction device of the present application by way of example.

[0047] Please refer to Figures 1-2 , in this embodiment, optionally, the vacuum soil moisture extraction device includes a loading mechanism 100, a cooling mechanism 200, a temperature control mechanism 300 and a base 400. The loading mechanism 100, the cooling mechanism 200 and the temperature control mechanism 300 are all integrated on the base 400, and the overall structure is compact with a small volume, which is convenient for maintenance. At the same time, the loading mechanism 100 can be used in cooperation with the cooling mechanism 200 and the temperature control mechanism 300 to perform moisture extraction operations on soil samples.

[0048] Among them, the loading mechanism 100 includes a carrier 110, a purging assembly 120, a vacuum pumping assembly 130 and a pipeline assembly 140. The purging assembly 120, the vacuum pumping assembly 130 and the pipeline assembly 140 are all coordinated with the carrier 110, and the purging assembly 120 and the vacuum pumping assembly 130 are both connected to the pipeline assembly 140.

[0049] Please refer to Figure 2 , for example, the carrier 110 includes a first driver 111, a second driver 112 and a positioning plate group 113. The first driver 111 is connected to the second driver 112, and the second driver 112 is connected to the positioning plate group 113. The first driver 111 is used to drive the second driver 112 and the positioning plate group 113 to rotate synchronously relative to the cooling mechanism 200 and the temperature control mechanism 300. The second driver 112 is used to drive the positioning plate group 113 to lift and lower relative to the cooling mechanism 200 and the temperature control mechanism 300. Among them, the first driver 111 can be a motor or a motor, and the first driver 111 can be fixed on the base 400. The rotating shaft of the first driver 111 extends vertically, and can drive the second driver 112 and the positioning plate group 113 to rotate in the horizontal plane, so as to adjust the position of the positioning plate group 113 in the horizontal plane. The second driver 112 can be a stepping motor, and the stepping motor can drive the positioning plate group 113 to reciprocate up and down in the vertical direction, and the stepping motor is easy to control, flexible and convenient.

[0050] Further, the positioning plate group 113 includes an upper pressing plate 1131 and a lower pressing plate 1132. The upper pressing plate 1131 and the lower pressing plate 1132 are arranged in a stacked manner and can be fixedly connected by structural members such as bolts. A clamping space is formed between the upper pressing plate 1131 and the lower pressing plate 1132. At the same time, the upper pressing plate 1131 or the lower pressing plate 1132 can be connected to the telescopic end of the second driver 112. During normal operation, the upper pressing plate 1131 is located above the lower pressing plate 1132, or rather, the upper pressing plate 1131 is located on the side of the lower pressing plate 1132 away from the base 400. In one embodiment, the lower pressing plate 1132 has a first side, a second side, a third side, and a fourth side that are sequentially connected end to end, and a sliding sleeve 1134 is provided on the first side. The number of sliding sleeves 1134 can be multiple to improve the stability of the positioning plate group 113 when sliding. An avoidance hole 1133 penetrating the plate surface of the lower pressing plate 1132 is also provided on the lower pressing plate 1132.

[0051] Please refer to Figure 2 , optionally, the purging assembly 120 includes a protective box 121, a nitrogen tank 122, a first air pipe 123, and a first valve 124. The protective box 121 is fixed on the rotating shaft of the first driver 111. The nitrogen tank 122 is installed in the protective box 121. The air outlet of the nitrogen tank 122 is communicated with the first air pipe 123, and a first valve 124 is installed on the first air pipe 123. The first valve 124 is used to control the on-off of the first air pipe 123, so as to control the flow rate of the first air pipe 123. At the same time, a slide rail 125 is provided on the outer surface of the protective box 121. The number of slide rails 125 is equal to and corresponds one-to-one with the number of sliding sleeves 1134. The mutually cooperating sliding sleeve 1134 and the slide rail 125 are slidably connected. Through the cooperation of the slide rail 125 and the sliding sleeve 1134, the stability of the positioning plate group 113 can be improved. In order to avoid interference between the positioning plate group 113 and the first air pipe 123 during lifting and lowering, the first air pipe 123 is set as a flexible pipe, which can adaptively change its shape.

[0052] Optionally, the vacuum pumping assembly 130 includes a vacuum pump 131, a second air pipe 132, and a second valve 133. The vacuum pump 131 is installed on the upper pressing plate 1131, and the air outlet of the vacuum pump 131 is communicated with the second air pipe 132. The second valve 133 is installed on the second air pipe 132, and the second valve 133 can control the on-off of the second air pipe 132, thereby controlling the vacuum pumping efficiency.

[0053] Please refer to Figures 2-4, Optionally, the pipeline assembly 140 includes a main pipe 141 and three working units. Both the first air pipe 123 and the second air pipe 132 are communicated with the main pipe 141. The main pipe 141 is a U-shaped pipe, and the main pipe 141 includes three pipe segments that are sequentially communicated. The three pipe segments respectively correspond to the second side, the third side, and the fourth side of the lower pressing plate 1132. That is, one pipe segment extends along the second side, another pipe segment extends along the third side, and the last pipe segment extends along the fourth side. The three working units respectively correspond to the three pipe segments. Each working unit includes a plurality of docking pipes 142 and a plurality of connecting pipes 143. The number of docking pipes 142 and the number of connecting pipes 143 correspond one-to-one and are equal. The plurality of docking pipes 142 are evenly spaced along the extending direction of the corresponding pipe segment. One ends of the plurality of docking pipes 142 are all communicated with the main pipe 141, and the other ends are respectively communicated with the corresponding connecting pipes 143. The position where the docking pipe 142 and the connecting pipe 143 are communicated is between the two ends of the connecting pipe 143, which will not affect the assembly of the two ends of the connecting pipe 143 with the sample pipe 001 and the water receiving bottle 002. During assembly, the main pipe 141 is located above the upper pressing plate 1131. The plurality of docking pipes 142 all penetrate through the upper pressing plate 1131. The connecting pipes 143 are clamped between the upper pressing plate 1131 and the lower pressing plate 1132, and the connecting pipes 143 extend out of the corresponding avoiding holes 1133.

[0054] Further, the connecting pipe 143 is arranged as a bent pipe. The connecting pipe 143 is generally a U-shaped pipe, and the connecting pipe 143 includes a first pipe segment 1431, a second pipe segment 1432, and a third pipe segment 1433 that are sequentially connected. The extending direction of the first pipe segment 1431 is the same as the extending direction of the third pipe segment 1433. The upper pressing plate 1131 and the lower pressing plate 1132 cooperate to clamp the second pipe segment 1432. Both the first pipe segment 1431 and the third pipe segment 1433 are located on the side of the upper pressing plate 1131 close to the lower pressing plate 1132. At the same time, the first pipe segment 1431 is arranged in the corresponding avoiding hole 1133, and the third pipe segment 1433 extends out of the edge of the corresponding side of the lower pressing plate 1132, so that the third pipe segment 1433 is located outside the first pipe segment 1431. The first pipe segment 1431 is used for installing the water receiving bottle 002, and the third pipe segment 1433 is used for installing the sample pipe 001. Since the sample pipe 001 is located outside the water receiving bottle 002, it is beneficial to the taking and placing of the soil sample in the sample pipe 001.

[0055] During the test, when purging operation is required, open the first valve 124 and close the second valve 133. Nitrogen in the nitrogen tank 122 is discharged from the first gas pipe 123, enters the main pipe 141, and then enters the connecting pipe 143 through the corresponding docking pipe 142, so as to purge and remove the debris in the main pipe 141, the connecting pipe 143 and the docking pipe 142. When vacuum pumping is required for the pipeline, close the first valve 124, open the second valve 133, and start the vacuum pump 131 to pump vacuum for the main pipe 141, the docking pipe 142, the connecting pipe 143, the water receiving bottle 002 and the sample tube 001.

[0056] In addition, when the second driver 112 drives the positioning plate group 113 to lift, the positioning plate group 113 slides relative to the slide rail 125 by relying on the sliding sleeve 1134. The slide rail 125 is fixed on the protection box 121, and the protection box 121 will not lift. The first gas pipe 123 of the nitrogen tank 122 penetrates through the protection box 121 and is connected to the external main pipe 141. The positioning plate group 113 drives the main pipe 141, the docking pipe 142 and the connecting pipe 143 to lift together. Since the first gas pipe 123 is a flexible pipe, it can deform adaptively, without interference and being pulled and damaged, and is safe and reliable to use.

[0057] In this embodiment, optionally, the cooling mechanism 200 includes a liquid nitrogen tank, and a certain amount of liquid nitrogen can be stored in the liquid nitrogen tank. The carrier 110 drives the sample tube 001 to descend, and the sample tube 001 is inserted into the liquid nitrogen tank, and the sample tube 001 is cooled by the liquid nitrogen.

[0058] Please refer to Figure 6 In this embodiment, optionally, the temperature control mechanism 300 includes an independently arranged heating tank 310 and a cooling tank 320. A heating cotton 330 is arranged in the heating tank 310, and the heating cotton 330 is used to contact the sample tube 001 and heat the sample tube 001. The cooling tank 320 is used to hold the liquid nitrogen for cooling the water receiving bottle 002. In addition, the heating cotton 330 can be set as a plurality of positioning grooves, and the number of the positioning grooves is the same as the number of the sample tubes 001, ensuring that each sample tube 001 can be inserted into a positioning groove, and the heating effect is good.

[0059] It should be understood that the heating cotton 330 can be made by embedding fine electric heating wires or conductive materials such as carbon fibers in the cotton fabric. After being electrified, the electric energy is converted into heat energy for heating.

[0060] In order to avoid mutual influence, a heat insulation wall can be arranged between the heating tank 310 and the cooling tank 320.

[0061] When extracting moisture from the soil sample in the sample tube 001, the sample tube 001 is heated by the heating tank 310, and at the same time, the water receiving bottle 002 is cooled by the cooling tank 320. There is a temperature difference between the sample tube 001 and the water receiving bottle 002. The moisture in the soil sample in the sample tube 001 is evaporated by heat. The formed water vapor enters the first pipe section 1431 after passing through the third pipe section 1433 and the second pipe section 1432. The water receiving bottle 002 is connected to the first pipe section 1431. The temperature of the water receiving bottle 002 is low. After the water vapor reaches the water receiving bottle 002, it is condensed into water and stored in the water receiving bottle 002.

[0062] To ensure that the water vapor can reach the water receiving bottle 002 smoothly, a valve can be set at the connection position between the docking pipe 142 and the second pipe section 1432. When extracting moisture, the valve is closed, and the water vapor will not enter the docking pipe 142. The valve can be an electromagnetic valve, which is conducive to regulation.

[0063] The vacuum soil moisture extraction device provided by this embodiment has a simple and reasonable structure, high integration, is conducive to maintenance, has a high degree of automation, and is conducive to improving the accuracy of test results.

[0064] Please refer to Figures 1-6 In this embodiment, a vacuum soil moisture extraction device is provided. One end of the sample tube 001 is connected to the connecting pipe 143, and the other end of the water receiving bottle 002 is connected to the connecting pipe 143. And the bottom of the sample tube 001 is lower than the bottom of the water receiving bottle 002. By setting the bottom of the sample tube 001 to be lower than the bottom of the water receiving bottle 002, when the second driver 112 drives the carrier 110 and the connecting pipe 143 to descend, the sample tube 001 and the water receiving bottle 002 descend together. When the sample tube 001 touches the liquid nitrogen in the liquid nitrogen tank, the water receiving bottle 002 does not contact the liquid nitrogen in the liquid nitrogen tank, reducing the consumption of liquid nitrogen and lowering the use cost. At the same time, the water receiving bottle 002 does not contact the liquid nitrogen and will not interfere with the cooling of the soil sample in the sample tube 001, improving the cooling efficiency and effect.

[0065] Optionally, the sample tube 001 is set as a bent tube. The sample tube 001 is located outside the water receiving bottle 002, and the end of the sample tube 001 far from the connecting pipe 143 is set outward. For example, the sample tube 001 is set as an L-shaped tube. The sample tube 001 includes a connected vertical tube section 011 and a horizontal tube section 012. The vertical tube section 011 is communicated with the connecting pipe 143, and the port of the horizontal tube section 012 is set outward. The port of the horizontal tube section 012 is used to add soil samples. Since the port of the horizontal tube section 012 is outward, it is conducive to adding soil samples from this end. After the addition is completed, the end can be blocked by a rubber plug 013.

[0066] In addition, a barrier cotton 014 is provided inside the sample tube 001. The barrier cotton 014 is used to allow air to pass through during the vacuuming process and prevent the soil sample located inside the sample tube 001 from leaving the sample tube 001. The barrier cotton 014 can be located in the vertical tube section 011 of the sample tube 001.

[0067] Please refer to Figure 5 , in addition, in order to prevent the subsequent absorption of part of the evaporated moisture by the barrier cotton 014 and affect the accuracy of moisture extraction, a conduit 015 is provided on the wall of the vertical tube section 011. A cable 016 is slidably arranged inside the conduit 015. The cable 016 is in dynamic sealing contact with the conduit 015. One end of the cable 016 is provided with a metal wire basket 017. The metal wire basket 017 has a certain shrinkage property. It can expand when it is inside the vertical tube section 011, so as to be able to accommodate the barrier cotton 014 and make the barrier cotton 014 in a fluffy state. It can also drive the barrier cotton 014 to enter the conduit 015 from the vertical tube section 011 under the drive of the cable 016 and be in a contracted state, cooperating with the barrier cotton 014 to block the conduit 015. At this time, the barrier cotton 014 is compressed and the voids are greatly reduced, effectively weakening the absorption of water vapor by the barrier cotton 014.

[0068] The vacuum soil moisture extraction device provided by this embodiment is conducive to soil moisture extraction, with convenient and flexible operation and high accuracy of test results.

[0069] This embodiment also provides a vacuum soil moisture extraction method, which is applied to the vacuum soil moisture extraction device in any of the foregoing embodiments. The method includes the following steps:

[0070] Step S100: Ventilate the connecting pipe 143 by using the purging assembly 120, which can clean the impurities in the connecting pipe 143.

[0071] Step S200: Install the sample tube 001 and the water receiving bottle 002 at both ends of the connecting pipe 143 respectively. After adding a soil sample to the end of the sample tube 001 far from the connecting pipe 143, seal the end of the sample tube 001 far from the connecting pipe 143; use the vacuuming assembly 130 to vacuum the connecting pipe 143, the sample tube 001 and the water receiving bottle 002.

[0072] Step S300: Under the condition that the carrier 110 is in the first position, cool the sample tube 001 by using the cooling mechanism 200, that is, cool the sample tube 001 by using liquid nitrogen, which is beneficial to the separation of moisture in the sample soil in the sample tube 001 and improves the extraction rate of soil moisture.

[0073] Step s400: Under the condition that the carrier 110 is in the second position, while heating the sample tube 001 by using the temperature control mechanism 300 and cooling the water receiving bottle 002, the moisture in the soil sample is separated out. During the separation process, the purging assembly 120 and the vacuum pumping assembly 130 are closed.

[0074] This method is flexible in operation, has a high degree of automation, high efficiency, less manual participation, low labor intensity, and high accuracy of test results.

[0075] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A vacuum soil moisture extraction device, used in conjunction with a sample tube (001) and a water collection bottle (002), characterized in that: It comprises a bearing mechanism (100), a cooling mechanism (200) and a temperature control mechanism (300), wherein: The carrier mechanism (100) comprises a carrier (110), a purge assembly (120), a vacuum assembly (130) and a connecting pipe (143); the purge assembly (120), the vacuum assembly (130) and the connecting pipe (143) are all mounted on the carrier (110); the purge assembly (120) and the vacuum assembly (130) are both connected to the connecting pipe (143); the purge assembly (120) is used to blow air into the connecting pipe (143); the vacuum assembly (130) is used to vacuum the connecting pipe (143); the two ends of the connecting pipe (143) are used to mount the sample tube (001) and the water receiving bottle (002), respectively; The carrier (110) is simultaneously movably coordinated with the cooling mechanism (200) and the temperature control mechanism (300), so that the carrier (110) has a first position and a second position that can be switched with each other. When in the first position, the cooling mechanism (200) is used to cool the sample tube (001) connected to the connecting tube (143); when in the second position, the temperature control mechanism (300) is used to heat the sample tube (001) and cool the water receiving bottle (002) at the same time. The sample tube (001) is configured as a bent tube. The sample tube (001) is located outside the water receiving bottle (002), and the end of the sample tube (001) away from the connecting tube (143) is arranged outward; the bottom of the sample tube (001) is lower than the bottom of the water receiving bottle (002).

2. The vacuum soil moisture extraction device according to claim 1, characterized in that: The carrier (110) comprises a first driver (111), a second driver (112) and a positioning plate group (113); the first driver (111) is connected to the second driver (112), the second driver (112) is connected to the positioning plate group (113), and the connecting pipe (143) is installed on the positioning plate group (113); the first driver (111) is used to drive the second driver (112) and the positioning plate group (113) to rotate synchronously relative to the cooling mechanism (200) and the temperature control mechanism (300); and the second driver (112) is used to drive the positioning plate group (113) to rise and fall relative to the cooling mechanism (200) and the temperature control mechanism (300).

3. The vacuum soil moisture extraction device according to claim 2, characterized in that: The positioning plate group (113) includes an upper pressing plate (1131) and a lower pressing plate (1132), wherein the upper pressing plate (1131) and the lower pressing plate (1132) are connected and cooperate to clamp the connecting tube (143), and both ends of the connecting tube (143) extend out of the area between the upper pressing plate (1131) and the lower pressing plate (1132); the upper pressing plate (1131) or the lower pressing plate (1132) is connected to the second driver (112), and the second driver (112) is used to drive the upper pressing plate (1131) and the lower pressing plate (1132) to rise and fall synchronously.

4. The vacuum soil moisture extraction device according to claim 3, characterized in that: The connecting tube (143) is configured as a U-shaped tube, which includes a first tube segment (1431), a second tube segment (1432) and a third tube segment (1433) which are connected in sequence, and the extension direction of the first tube segment (1431) is the same as the extension direction of the third tube segment (1433); the upper pressing plate (1131) and the lower pressing plate (1132) cooperate to clamp the second tube segment (1432), the upper pressing plate (1131) is located above the lower pressing plate (1132), and the first tube segment (1431) and the third tube segment (1433) are both located on one side of the upper pressing plate (1131) close to the lower pressing plate (1132).

5. The vacuum soil moisture extraction device according to claim 4, characterized in that: The lower pressure plate (1132) is provided with an avoidance hole (1133), the first pipe section (1431) is passed through the avoidance hole (1133), and the third pipe section (1433) extends out of the edge of the lower pressure plate (1132); the first pipe section (1431) is connected to the water receiving bottle (002), and the third pipe section (1433) is connected to the sample tube (001).

6. The vacuum soil moisture extraction device according to claim 1, characterized in that: The temperature control mechanism (300) comprises a heating tank (310) and a cooling tank (320) which are independently arranged. A heating cotton (330) is arranged in the heating tank (310). The heating cotton (330) is used to contact the sample tube (001) and heat the sample tube (001). The cooling tank (320) is used to contain liquid nitrogen for cooling the water receiving bottle (002).

7. The vacuum soil moisture extraction device according to claim 1, characterized in that: The sample tube (001) is provided with a barrier cotton (014), and the barrier cotton (014) is used to allow air to pass through during the vacuuming process and to prevent the soil sample in the sample tube (001) from leaving the sample tube (001).

8. A vacuum soil moisture extraction method, characterized in that: The vacuum soil moisture extraction device according to any one of claims 1 to 7 comprises the following steps: Step s100: using the purge assembly (120) to ventilate the connecting pipe (143); Step s200: installing the sample tube (001) and the water collecting bottle (002) at both ends of the connecting tube (143) respectively, and after adding the soil sample from the end of the sample tube (001) away from the connecting tube (143), sealing the end of the sample tube (001) away from the connecting tube (143); and evacuating the connecting tube (143), the sample tube (001) and the water collecting bottle (002) using a vacuum assembly (130); Step s300: Cooling the sample tube (001) using a cooling mechanism (200) under the condition that the carrier (110) is in the first position; Step s400: Under the condition that the carrier (110) is in the second position, the temperature control mechanism (300) is used to heat the sample tube (001) and cool the water receiving bottle (002) at the same time.

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